Merge pull request 'PDF Markings' (#114) from issue-99 into staging

Reviewed-on: #114

package-lock.json

@@ -30,6 +30,8 @@
         "lodash": "4.17.21",
         "mui-file-input": "4.0.4",
         "nostr-tools": "2.7.0",
+        "pdf-lib": "^1.17.1",
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         "react-dnd": "16.0.1",
         "react-dnd-html5-backend": "16.0.1",
@@ -44,6 +46,7 @@
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         "@types/file-saver": "2.0.7",
         "@types/lodash": "4.14.202",
+        "@types/pdfjs-dist": "^2.10.378",
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         "@types/react-dom": "^18.2.19",
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@@ -1258,6 +1261,46 @@
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+        "rimraf": "^3.0.2",
+        "semver": "^7.3.5",
+        "tar": "^6.1.11"
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@@ -1699,6 +1742,24 @@
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+      "license": "MIT",
+      "dependencies": {
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+      }
+    },
+    "node_modules/@pdf-lib/upng": {
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+      "license": "MIT",
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+      }
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@@ -2152,6 +2213,16 @@
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+      "resolved": "https://registry.npmjs.org/@types/pdfjs-dist/-/pdfjs-dist-2.10.378.tgz",
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+      "deprecated": "This is a stub types definition. pdfjs-dist provides its own type definitions, so you do not need this installed.",
+      "dev": true,
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@@ -2415,6 +2486,12 @@
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@@ -2445,6 +2522,18 @@
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@@ -2494,6 +2583,40 @@
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+      "optional": true,
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@@ -2661,6 +2784,21 @@
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@@ -2710,6 +2848,15 @@
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@@ -2848,6 +3010,18 @@
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@@ -2862,6 +3036,21 @@
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@@ -3537,11 +3732,41 @@
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@@ -3565,6 +3790,27 @@
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@@ -3677,6 +3923,12 @@
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@@ -5399,6 +5926,16 @@
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       "integrity": "sha512-Tpp60P6IUJDTuOq/5Z8cdskzJujfwqfOTkrwIwj7IRISpnkJnT6SyJ4PCPnGMoFjC9ddhal5KVIYtAt97ix05A=="
     },
+    "node_modules/whatwg-url": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-5.0.0.tgz",
+      "integrity": "sha512-saE57nupxk6v3HY35+jzBwYa0rKSy0XR8JSxZPwgLr7ys0IBzhGviA1/TUGJLmSVqs8pb9AnvICXEuOHLprYTw==",
+      "optional": true,
+      "dependencies": {
+        "tr46": "~0.0.3",
+        "webidl-conversions": "^3.0.0"
+      }
+    },
     "node_modules/which": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
@@ -5414,11 +5951,20 @@
         "node": ">= 8"
       }
     },
+    "node_modules/wide-align": {
+      "version": "1.1.5",
+      "resolved": "https://registry.npmjs.org/wide-align/-/wide-align-1.1.5.tgz",
+      "integrity": "sha512-eDMORYaPNZ4sQIuuYPDHdQvf4gyCF9rEEV/yPxGfwPkRodwEgiMUUXTx/dex+Me0wxx53S+NgUHaP7y3MGlDmg==",
+      "optional": true,
+      "dependencies": {
+        "string-width": "^1.0.2 || 2 || 3 || 4"
+      }
+    },
     "node_modules/wrappy": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
       "integrity": "sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ==",
-      "dev": true
+      "devOptional": true
     },
     "node_modules/yaeti": {
       "version": "0.0.6",

package.json

@@ -36,6 +36,8 @@
     "lodash": "4.17.21",
     "mui-file-input": "4.0.4",
     "nostr-tools": "2.7.0",
+    "pdf-lib": "^1.17.1",
+    "pdfjs-dist": "^4.4.168",
     "react": "^18.2.0",
     "react-dnd": "16.0.1",
     "react-dnd-html5-backend": "16.0.1",
@@ -50,6 +52,7 @@
     "@types/crypto-js": "^4.2.2",
     "@types/file-saver": "2.0.7",
     "@types/lodash": "4.14.202",
+    "@types/pdfjs-dist": "^2.10.378",
     "@types/react": "^18.2.56",
     "@types/react-dom": "^18.2.19",
     "@typescript-eslint/eslint-plugin": "^7.0.2",

src/components/DrawPDFFields/index.tsx

@@ -0,0 +1,495 @@
+import { AccessTime, CalendarMonth, ExpandMore, Gesture, PictureAsPdf, Badge, Work, Close } from '@mui/icons-material'
+import { Box, Typography, Accordion, AccordionDetails, AccordionSummary, CircularProgress, FormControl, InputLabel, MenuItem, Select } from '@mui/material'
+import styles from './style.module.scss'
+import { useEffect, useState } from 'react'
+
+import * as PDFJS from "pdfjs-dist";
+import { ProfileMetadata, User } from '../../types';
+import { PdfFile, DrawTool, MouseState, PdfPage, DrawnField, MarkType } from '../../types/drawing';
+import { truncate } from 'lodash';
+import { hexToNpub } from '../../utils';
+import { toPdfFiles } from '../../utils/pdf.ts'
+PDFJS.GlobalWorkerOptions.workerSrc = 'node_modules/pdfjs-dist/build/pdf.worker.mjs';
+
+interface Props {
+  selectedFiles: File[]
+  users: User[]
+  metadata: { [key: string]: ProfileMetadata }
+  onDrawFieldsChange: (pdfFiles: PdfFile[]) => void
+}
+
+export const DrawPDFFields = (props: Props) => {
+  const { selectedFiles } = props
+  
+  const [pdfFiles, setPdfFiles] = useState<PdfFile[]>([])
+  const [parsingPdf, setParsingPdf] = useState<boolean>(false)
+  const [showDrawToolBox, setShowDrawToolBox] = useState<boolean>(false)
+  
+  const [selectedTool, setSelectedTool] = useState<DrawTool | null>()
+  const [toolbox] = useState<DrawTool[]>([
+    {
+      identifier: MarkType.SIGNATURE,
+      icon: <Gesture/>,
+      label: 'Signature',
+      active: false
+  
+    },
+    {
+      identifier: MarkType.FULLNAME,
+      icon: <Badge/>,
+      label: 'Full Name',
+      active: true
+    },
+    {
+      identifier: MarkType.JOBTITLE,
+      icon: <Work/>,
+      label: 'Job Title',
+      active: false
+    },
+    {
+      identifier: MarkType.DATE,
+      icon: <CalendarMonth/>,
+      label: 'Date',
+      active: false
+    },
+    {
+      identifier: MarkType.DATETIME,
+      icon: <AccessTime/>,
+      label: 'Datetime',
+      active: false
+    },
+  ])
+
+  const [mouseState, setMouseState] = useState<MouseState>({
+    clicked: false
+  })
+
+  useEffect(() => {
+    if (selectedFiles) {
+      setParsingPdf(true)
+      
+      parsePdfPages().finally(() => {
+        setParsingPdf(false)
+      })
+    }
+  }, [selectedFiles])
+
+  useEffect(() => {
+    if (pdfFiles) props.onDrawFieldsChange(pdfFiles)
+  }, [pdfFiles])
+
+  /**
+   * Drawing events
+   */
+  useEffect(() => {  
+    // window.addEventListener('mousedown', onMouseDown);
+    window.addEventListener('mouseup', onMouseUp);
+    
+    return () => {
+      // window.removeEventListener('mousedown', onMouseDown);
+      window.removeEventListener('mouseup', onMouseUp);
+    }
+  }, [])
+
+  const refreshPdfFiles = () => {
+    setPdfFiles([...pdfFiles])
+  }
+
+  /**
+   * Fired only when left click and mouse over pdf page
+   * Creates new drawnElement and pushes in the array
+   * It is re rendered and visible right away
+   *
+   * @param event Mouse event
+   * @param page PdfPage where press happened
+   */
+  const onMouseDown = (event: any, page: PdfPage) => {
+    // Proceed only if left click
+    if (event.button !== 0) return
+    
+    // Only allow drawing if mouse is not over other drawn element
+    const isOverPdfImageWrapper = event.target.tagName === 'IMG'
+
+    if (!selectedTool || !isOverPdfImageWrapper) {
+      return
+    }
+
+    const { mouseX, mouseY } = getMouseCoordinates(event)
+
+    const newField: DrawnField = {
+      left: mouseX,
+      top: mouseY,
+      width: 0,
+      height: 0,
+      counterpart: '',
+      type: selectedTool.identifier
+    }
+
+    page.drawnFields.push(newField)
+
+    setMouseState((prev) => {
+      return {
+        ...prev,
+        clicked: true
+      }
+    })
+  }
+
+  /**
+   * Drawing is finished, resets all the variables used to draw
+   * @param event Mouse event
+   */
+  const onMouseUp = () => {
+    setMouseState((prev) => {
+      return {
+        ...prev,
+        clicked: false,
+        dragging: false,
+        resizing: false
+      }
+    })
+  }
+
+  /**
+   * After {@link onMouseDown} create an drawing element, this function gets called on every pixel moved
+   * which alters the newly created drawing element, resizing it while mouse move
+   * @param event Mouse event
+   * @param page PdfPage where moving is happening
+   */
+  const onMouseMove = (event: any, page: PdfPage) => {
+    if (mouseState.clicked && selectedTool) {
+      const lastElementIndex = page.drawnFields.length -1
+      const lastDrawnField = page.drawnFields[lastElementIndex]
+
+      const { mouseX, mouseY } = getMouseCoordinates(event)
+      
+      const width = mouseX - lastDrawnField.left
+      const height = mouseY - lastDrawnField.top
+
+      lastDrawnField.width = width
+      lastDrawnField.height = height
+
+      const currentDrawnFields = page.drawnFields
+
+      currentDrawnFields[lastElementIndex] = lastDrawnField
+      
+      refreshPdfFiles()
+    }
+  } 
+
+  /**
+   * Fired when event happens on the drawn element which will be moved
+   * mouse coordinates relative to drawn element will be stored
+   * so when we start moving, offset can be calculated
+   * mouseX - offsetX
+   * mouseY - offsetY
+   *
+   * @param event Mouse event
+   * @param drawnField Which we are moving
+   */
+  const onDrawnFieldMouseDown = (event: any) => {
+    event.stopPropagation()
+    
+    // Proceed only if left click
+    if (event.button !== 0) return
+
+    const drawingRectangleCoords = getMouseCoordinates(event)
+
+    setMouseState({
+      dragging: true,
+      clicked: false,
+      coordsInWrapper: {
+        mouseX: drawingRectangleCoords.mouseX,
+        mouseY: drawingRectangleCoords.mouseY
+      }
+    })
+  }
+
+  /**
+   * Moves the drawnElement by the mouse position (mouse can grab anywhere on the drawn element)
+   * @param event Mouse event
+   * @param drawnField which we are moving
+   */
+  const onDranwFieldMouseMove = (event: any, drawnField: DrawnField) => {
+    if (mouseState.dragging) {
+      const { mouseX, mouseY, rect } = getMouseCoordinates(event, event.target.parentNode)
+      const coordsOffset = mouseState.coordsInWrapper
+
+      if (coordsOffset) {
+        let left = mouseX - coordsOffset.mouseX
+        let top = mouseY - coordsOffset.mouseY
+
+        const rightLimit = rect.width - drawnField.width - 3
+        const bottomLimit = rect.height - drawnField.height - 3
+
+        if (left < 0) left = 0
+        if (top < 0) top = 0
+        if (left > rightLimit) left = rightLimit
+        if (top > bottomLimit) top = bottomLimit
+
+        drawnField.left = left
+        drawnField.top = top
+
+        refreshPdfFiles()
+      }
+    }
+  }
+
+  /**
+   * Fired when clicked on the resize handle, sets the state for a resize action
+   * @param event Mouse event
+   * @param drawnField which we are resizing
+   */
+  const onResizeHandleMouseDown = (event: any) => {
+    // Proceed only if left click
+    if (event.button !== 0) return
+
+    event.stopPropagation()
+
+    setMouseState({
+      resizing: true
+    })
+  }
+
+  /**
+   * Resizes the drawn element by the mouse position
+   * @param event Mouse event
+   * @param drawnField which we are resizing
+   */
+  const onResizeHandleMouseMove = (event: any, drawnField: DrawnField) => {
+    if (mouseState.resizing) {
+      const { mouseX, mouseY } = getMouseCoordinates(event, event.target.parentNode.parentNode)
+      
+      const width = mouseX - drawnField.left
+      const height = mouseY - drawnField.top
+
+      drawnField.width = width
+      drawnField.height = height
+
+      refreshPdfFiles()
+    }
+  }
+
+  /**
+   * Removes the drawn element using the indexes in the params
+   * @param event Mouse event
+   * @param pdfFileIndex pdf file index
+   * @param pdfPageIndex pdf page index
+   * @param drawnFileIndex drawn file index
+   */
+  const onRemoveHandleMouseDown = (event: any, pdfFileIndex: number, pdfPageIndex: number, drawnFileIndex: number) => {
+    event.stopPropagation()
+    
+    pdfFiles[pdfFileIndex].pages[pdfPageIndex].drawnFields.splice(drawnFileIndex, 1)
+  }
+
+  /**
+   * Used to stop mouse click propagating to the parent elements
+   * so select can work properly
+   * @param event Mouse event
+   */
+  const onUserSelectHandleMouseDown = (event: any) => {
+    event.stopPropagation()
+  }
+
+  /**
+   * Gets the mouse coordinates relative to a element in the `event` param
+   * @param event MouseEvent
+   * @param customTarget mouse coordinates relative to this element, if not provided
+   * event.target will be used
+   */
+  const getMouseCoordinates = (event: any, customTarget?: any) => {
+    const target = customTarget ? customTarget : event.target
+    const rect = target.getBoundingClientRect();
+    const mouseX = event.clientX - rect.left; //x position within the element.
+    const mouseY = event.clientY - rect.top;  //y position within the element.
+
+    return {
+      mouseX,
+      mouseY,
+      rect
+    }
+  }
+
+  /**
+   * Reads the pdf binary files and converts it's pages to images
+   * creates the pdfFiles object and sets to a state
+   */
+  const parsePdfPages = async () => {
+    const pdfFiles: PdfFile[] = await toPdfFiles(selectedFiles);
+    
+    setPdfFiles(pdfFiles)
+  }
+
+  /**
+   *
+   * @returns if expanded pdf accordion is present
+   */
+  const hasExpandedPdf = () => {
+    return !!pdfFiles.filter(pdfFile => !!pdfFile.expanded).length
+  }
+
+  const handleAccordionExpandChange = (expanded: boolean, pdfFile: PdfFile) => {
+    pdfFile.expanded = expanded
+
+    refreshPdfFiles()
+    setShowDrawToolBox(hasExpandedPdf())
+  }
+
+  /**
+   * Changes the drawing tool
+   * @param drawTool to draw with
+   */
+  const handleToolSelect = (drawTool: DrawTool) => {
+    // If clicked on the same tool, unselect
+    if (drawTool.identifier === selectedTool?.identifier) {
+      setSelectedTool(null)
+      return
+    }
+
+    setSelectedTool(drawTool)
+  }
+
+  /**
+   * Renders the pdf pages and drawing elements
+   */
+  const getPdfPages = (pdfFile: PdfFile, pdfFileIndex: number) => {
+    return (
+      <Box sx={{
+        width: '100%'
+      }}>
+        {pdfFile.pages.map((page, pdfPageIndex: number) => {
+          return (
+            <div
+              key={pdfPageIndex}
+              style={{
+                border: '1px solid #c4c4c4',
+                marginBottom: '10px'
+              }}
+              className={`${styles.pdfImageWrapper} ${selectedTool ? styles.drawing : ''}`}
+              onMouseMove={(event) => {onMouseMove(event, page)}}
+              onMouseDown={(event) => {onMouseDown(event, page)}}
+            >
+              <img draggable="false" style={{ width: '100%' }} src={page.image}/>
+
+              {page.drawnFields.map((drawnField, drawnFieldIndex: number) => {
+                return (
+                  <div
+                    key={drawnFieldIndex}
+                    onMouseDown={onDrawnFieldMouseDown}
+                    onMouseMove={(event) => { onDranwFieldMouseMove(event, drawnField)}}
+                    className={styles.drawingRectangle}
+                    style={{
+                      left: `${drawnField.left}px`,
+                      top: `${drawnField.top}px`,
+                      width: `${drawnField.width}px`,
+                      height: `${drawnField.height}px`,
+                      pointerEvents: mouseState.clicked ? 'none' : 'all'
+                    }}
+                  >
+                    <span
+                      onMouseDown={onResizeHandleMouseDown}
+                      onMouseMove={(event) => {onResizeHandleMouseMove(event, drawnField)}}
+                      className={styles.resizeHandle}
+                    ></span>
+                    <span
+                      onMouseDown={(event) => {onRemoveHandleMouseDown(event, pdfFileIndex, pdfPageIndex, drawnFieldIndex)}}
+                      className={styles.removeHandle}
+                    >
+                      <Close fontSize='small'/>
+                    </span>
+                    <div 
+                      onMouseDown={onUserSelectHandleMouseDown}
+                      className={styles.userSelect}
+                    >
+                      <FormControl fullWidth size='small'>
+                        <InputLabel id="counterparts">Counterpart</InputLabel>
+                        <Select
+                          value={drawnField.counterpart}
+                          onChange={(event) => { drawnField.counterpart = event.target.value; refreshPdfFiles() }}
+                          labelId="counterparts"
+                          label="Counterparts"
+                        >
+                          {props.users.map((user, index) => {
+                            let displayValue = truncate(hexToNpub(user.pubkey), {
+                              length: 16
+                            })
+
+                            const metadata = props.metadata[user.pubkey]
+
+                            if (metadata) {
+                              displayValue = truncate(metadata.name || metadata.display_name || metadata.username, {
+                                length: 16
+                              })
+                            }
+
+                            return <MenuItem key={index} value={hexToNpub(user.pubkey)}>{displayValue}</MenuItem>
+                          })}
+                        </Select>
+                      </FormControl>
+                    </div>
+                  </div>
+                )
+              })}
+            </div>
+          )
+        })}
+      </Box>
+    ) 
+  }
+
+  if (parsingPdf) {
+    return (
+      <Box sx={{ width: '100%', textAlign: 'center' }}>
+        <CircularProgress/>
+      </Box>
+    )
+  }
+
+  if (!pdfFiles.length) {
+    return ''
+  }
+
+  return (
+    <Box>
+      <Box sx={{ mt: 1 }}>
+        <Typography sx={{ mb: 1 }}>Draw fields on the PDFs:</Typography>
+        
+        {pdfFiles.map((pdfFile, pdfFileIndex: number) => {
+          return (
+            <Accordion key={pdfFileIndex} expanded={pdfFile.expanded} onChange={(_event, expanded) => {handleAccordionExpandChange(expanded, pdfFile)}}>
+              <AccordionSummary
+                expandIcon={<ExpandMore />}
+                aria-controls={`panel${pdfFileIndex}-content`}
+                id={`panel${pdfFileIndex}header`}
+              >
+                <PictureAsPdf sx={{ mr: 1 }}/>
+                {pdfFile.file.name}
+              </AccordionSummary>
+              <AccordionDetails>
+                {getPdfPages(pdfFile, pdfFileIndex)}
+              </AccordionDetails>
+          </Accordion>
+          )
+        })}
+      </Box>
+
+      {showDrawToolBox && (
+        <Box className={styles.drawToolBoxContainer}>
+          <Box className={styles.drawToolBox}>
+            {toolbox.filter(drawTool => drawTool.active).map((drawTool: DrawTool, index: number) => {
+              return (
+                <Box
+                  key={index} 
+                  onClick={() => {handleToolSelect(drawTool)}} className={`${styles.toolItem} ${selectedTool?.identifier === drawTool.identifier ? styles.selected : ''}`}>
+                  { drawTool.icon }
+                  { drawTool.label }
+                </Box>
+              )
+            })}
+          </Box>
+        </Box>
+      )}
+    </Box>
+  )
+}

src/components/DrawPDFFields/style.module.scss

@@ -0,0 +1,113 @@
+.pdfFieldItem {
+  background: white;
+  padding: 10px;
+  border-radius: 4px;
+  cursor: pointer;
+}
+
+.drawToolBoxContainer {
+  position: fixed;
+  bottom: 0;
+  left: 0;
+  right: 0;
+  display: flex;
+  justify-content: center;
+  z-index: 50;
+
+  .drawToolBox {
+    display: flex;
+    gap: 10px;
+    min-width: 100px;
+    background-color: white;
+    padding: 15px;
+    box-shadow: 0 0 10px 1px #0000003b;
+    border-radius: 4px;
+
+    .toolItem {
+      display: flex;
+      flex-direction: column;
+      align-items: center;
+      border: 1px solid rgba(0, 0, 0, 0.137);
+      padding: 5px;
+      cursor: pointer;
+      user-select: none;
+
+      &.selected {
+        border-color: #01aaad;
+        color: #01aaad;
+      }
+
+      &:not(.selected) {
+        &:hover {
+          border-color: #01aaad79;
+        }
+      }
+
+    }
+  }
+}
+
+.pdfImageWrapper {
+  position: relative;
+  user-select: none;
+  
+  &.drawing {
+    cursor: crosshair;
+  }
+}
+
+.drawingRectangle {
+  position: absolute;
+  border: 1px solid #01aaad;
+  z-index: 50;
+  background-color: #01aaad4b;
+  cursor: pointer;
+  display: flex;
+  justify-content: center;
+  align-items: center;
+
+  &.nonEditable {
+    cursor: default;
+    visibility: hidden;
+  }
+
+  .resizeHandle {
+    position: absolute;
+    right: -5px;
+    bottom: -5px;
+    width: 10px;
+    height: 10px;
+    background-color: #fff;
+    border: 1px solid rgb(160, 160, 160);
+    border-radius: 50%;
+    cursor: pointer;
+  }
+
+  .removeHandle {
+    position: absolute;
+    display: flex;
+    justify-content: center;
+    align-items: center;
+    top: -30px;
+    width: 20px;
+    height: 20px;
+    background-color: #fff;
+    border: 1px solid rgb(160, 160, 160);
+    border-radius: 50%;
+    color: #E74C3C;
+    font-size: 10px;
+    cursor: pointer;
+  }
+
+  .userSelect {
+    position: absolute;
+    display: flex;
+    justify-content: center;
+    align-items: center;
+    bottom: -60px;
+    min-width: 170px;
+    min-height: 30px;
+    background: #fff;
+    padding: 5px 0;
+  }
+}

src/components/PDFView/PdfItem.tsx

@@ -0,0 +1,35 @@
+import { PdfFile } from '../../types/drawing.ts'
+import { CurrentUserMark } from '../../types/mark.ts'
+import PdfPageItem  from './PdfPageItem.tsx';
+
+interface PdfItemProps {
+  pdfFile: PdfFile
+  currentUserMarks: CurrentUserMark[]
+  handleMarkClick: (id: number) => void
+  selectedMarkValue: string
+  selectedMark: CurrentUserMark | null
+}
+
+/**
+ * Responsible for displaying pages of a single Pdf File.
+ */
+const PdfItem = ({ pdfFile, currentUserMarks, handleMarkClick, selectedMarkValue, selectedMark }: PdfItemProps) => {
+  const filterByPage = (marks: CurrentUserMark[], page: number): CurrentUserMark[] => {
+    return marks.filter((m) => m.mark.location.page === page);
+  }
+  return (
+    pdfFile.pages.map((page, i) => {
+      return (
+        <PdfPageItem
+          page={page}
+          key={i}
+          currentUserMarks={filterByPage(currentUserMarks, i)}
+          handleMarkClick={handleMarkClick}
+          selectedMarkValue={selectedMarkValue}
+          selectedMark={selectedMark}
+        />
+      )
+  }))
+}
+
+export default PdfItem

src/components/PDFView/PdfMarkItem.tsx

@@ -0,0 +1,37 @@
+import { CurrentUserMark } from '../../types/mark.ts'
+import styles from '../DrawPDFFields/style.module.scss'
+import { inPx } from '../../utils/pdf.ts'
+
+interface PdfMarkItemProps {
+  userMark: CurrentUserMark
+  handleMarkClick: (id: number) => void
+  selectedMarkValue: string
+  selectedMark: CurrentUserMark | null
+}
+
+/**
+ * Responsible for display an individual Pdf Mark.
+ */
+const PdfMarkItem = ({ selectedMark, handleMarkClick, selectedMarkValue, userMark }: PdfMarkItemProps) => {
+  const { location } = userMark.mark;
+  const handleClick = () => handleMarkClick(userMark.mark.id);
+  const getMarkValue = () => (
+    selectedMark?.mark.id === userMark.mark.id
+      ? selectedMarkValue
+      : userMark.mark.value
+  )
+  return (
+    <div
+      onClick={handleClick}
+      className={styles.drawingRectangle}
+      style={{
+        left: inPx(location.left),
+        top: inPx(location.top),
+        width: inPx(location.width),
+        height: inPx(location.height)
+      }}
+    >{getMarkValue()}</div>
+  )
+}
+
+export default PdfMarkItem

src/components/PDFView/PdfMarking.tsx

@@ -0,0 +1,100 @@
+import PdfView from './index.tsx'
+import MarkFormField from '../../pages/sign/MarkFormField.tsx'
+import { PdfFile } from '../../types/drawing.ts'
+import { CurrentUserMark, Mark } from '../../types/mark.ts'
+import React, { useState, useEffect } from 'react'
+import {
+  findNextCurrentUserMark,
+  isCurrentUserMarksComplete,
+  updateCurrentUserMarks,
+} from '../../utils'
+import { EMPTY } from '../../utils/const.ts'
+import { Container } from '../Container'
+import styles from '../../pages/sign/style.module.scss'
+
+interface PdfMarkingProps {
+  files: { pdfFile: PdfFile, filename: string, hash: string | null }[],
+  currentUserMarks: CurrentUserMark[],
+  setIsReadyToSign: (isReadyToSign: boolean) => void,
+  setCurrentUserMarks: (currentUserMarks: CurrentUserMark[]) => void,
+  setUpdatedMarks: (markToUpdate: Mark) => void
+}
+
+/**
+ * Top-level component responsible for displaying Pdfs, Pages, and Marks,
+ * as well as tracking if the document is ready to be signed.
+ * @param props
+ * @constructor
+ */
+const PdfMarking = (props: PdfMarkingProps) => {
+  const {
+    files,
+    currentUserMarks,
+    setIsReadyToSign,
+    setCurrentUserMarks,
+    setUpdatedMarks
+  } = props
+  const [selectedMark, setSelectedMark] = useState<CurrentUserMark | null>(null)
+  const [selectedMarkValue, setSelectedMarkValue] = useState<string>("")
+
+  useEffect(() => {
+    setSelectedMark(findNextCurrentUserMark(currentUserMarks) || null)
+  }, [currentUserMarks])
+
+  const handleMarkClick = (id: number) => {
+    const nextMark = currentUserMarks.find((mark) => mark.mark.id === id);
+    setSelectedMark(nextMark!);
+    setSelectedMarkValue(nextMark?.mark.value ?? EMPTY);
+  }
+
+  const handleSubmit = (event: React.FormEvent<HTMLFormElement>) => {
+    event.preventDefault();
+    if (!selectedMarkValue || !selectedMark) return;
+
+    const updatedMark: CurrentUserMark = {
+      ...selectedMark,
+      mark: {
+        ...selectedMark.mark,
+        value: selectedMarkValue
+      },
+      isCompleted: true
+    }
+
+    setSelectedMarkValue(EMPTY)
+    const updatedCurrentUserMarks = updateCurrentUserMarks(currentUserMarks, updatedMark);
+    setCurrentUserMarks(updatedCurrentUserMarks)
+    setSelectedMark(findNextCurrentUserMark(updatedCurrentUserMarks) || null)
+    console.log(isCurrentUserMarksComplete(updatedCurrentUserMarks))
+    setIsReadyToSign(isCurrentUserMarksComplete(updatedCurrentUserMarks))
+    setUpdatedMarks(updatedMark.mark)
+  }
+
+  const handleChange = (event: React.ChangeEvent<HTMLInputElement>) => setSelectedMarkValue(event.target.value)
+
+  return (
+    <>
+      <Container className={styles.container}>
+        {
+          currentUserMarks?.length > 0 && (
+            <PdfView
+              files={files}
+              handleMarkClick={handleMarkClick}
+              selectedMarkValue={selectedMarkValue}
+              selectedMark={selectedMark}
+              currentUserMarks={currentUserMarks}
+            />)}
+        {
+          selectedMark !== null && (
+            <MarkFormField
+              handleSubmit={handleSubmit}
+              handleChange={handleChange}
+              selectedMark={selectedMark}
+              selectedMarkValue={selectedMarkValue}
+            />
+          )}
+      </Container>
+    </>
+  )
+}
+
+export default PdfMarking

src/components/PDFView/PdfPageItem.tsx

@@ -0,0 +1,46 @@
+import styles from '../DrawPDFFields/style.module.scss'
+import { PdfPage } from '../../types/drawing.ts'
+import { CurrentUserMark } from '../../types/mark.ts'
+import PdfMarkItem from './PdfMarkItem.tsx'
+interface PdfPageProps {
+  page: PdfPage
+  currentUserMarks: CurrentUserMark[]
+  handleMarkClick: (id: number) => void
+  selectedMarkValue: string
+  selectedMark: CurrentUserMark | null
+}
+
+/**
+ * Responsible for rendering a single Pdf Page and its Marks
+ */
+const PdfPageItem = ({ page, currentUserMarks, handleMarkClick, selectedMarkValue, selectedMark }: PdfPageProps) => {
+  return (
+    <div
+      className={styles.pdfImageWrapper}
+      style={{
+        border: '1px solid #c4c4c4',
+        marginBottom: '10px',
+        marginTop: '10px'
+      }}
+    >
+      <img
+        draggable="false"
+        src={page.image}
+        style={{ width: '100%'}}
+
+      />
+      {
+        currentUserMarks.map((m, i) => (
+          <PdfMarkItem
+            key={i}
+            handleMarkClick={handleMarkClick}
+            selectedMarkValue={selectedMarkValue}
+            userMark={m}
+            selectedMark={selectedMark}
+        />
+      ))}
+    </div>
+  )
+}
+
+export default PdfPageItem

src/components/PDFView/index.tsx

@@ -0,0 +1,42 @@
+import { PdfFile } from '../../types/drawing.ts'
+import { Box } from '@mui/material'
+import PdfItem from './PdfItem.tsx'
+import { CurrentUserMark } from '../../types/mark.ts'
+
+interface PdfViewProps {
+  files: { pdfFile: PdfFile, filename: string, hash: string | null }[]
+  currentUserMarks: CurrentUserMark[]
+  handleMarkClick: (id: number) => void
+  selectedMarkValue: string
+  selectedMark: CurrentUserMark | null
+}
+
+/**
+ * Responsible for rendering Pdf files.
+ */
+const PdfView = ({ files, currentUserMarks, handleMarkClick, selectedMarkValue, selectedMark }: PdfViewProps) => {
+  const filterByFile = (currentUserMarks: CurrentUserMark[], hash: string): CurrentUserMark[] => {
+    return currentUserMarks.filter((currentUserMark) => currentUserMark.mark.pdfFileHash === hash)
+  }
+  return (
+    <Box sx={{ width: '100%' }}>
+      {
+        files.map(({ pdfFile, hash }, i) => {
+          if (!hash) return
+          return (
+            <PdfItem
+              pdfFile={pdfFile}
+              key={i}
+              currentUserMarks={filterByFile(currentUserMarks, hash)}
+              selectedMark={selectedMark}
+              handleMarkClick={handleMarkClick}
+              selectedMarkValue={selectedMarkValue}
+          />
+          )
+        })
+      }
+    </Box>
+  )
+}
+
+export default PdfView;

src/components/PDFView/style.module.scss

@@ -0,0 +1,16 @@
+.imageWrapper {
+  display: flex;
+  justify-content: center;
+  align-items: center;
+  width: 100%; /* Adjust as needed */
+  height: 100%; /* Adjust as needed */
+  overflow: hidden; /* Ensure no overflow */
+  border: 1px solid #ccc; /* Optional: for visual debugging */
+  background-color: #e0f7fa; /* Optional: for visual debugging */
+}
+
+.image {
+  max-width: 100%;
+  max-height: 100%;
+  object-fit: contain; /* Ensure the image fits within the container */
+}

src/pages/create/index.tsx

@@ -59,7 +59,11 @@ import {
   updateUsersAppData,
   uploadToFileStorage
 } from '../../utils'
+import { Container } from '../../components/Container'
 import styles from './style.module.scss'
+import { PdfFile } from '../../types/drawing'
+import { DrawPDFFields } from '../../components/DrawPDFFields'
+import { Mark } from '../../types/mark.ts'
 
 export const CreatePage = () => {
   const navigate = useNavigate()
@@ -84,6 +88,46 @@ export const CreatePage = () => {
 
   const nostrController = NostrController.getInstance()
 
+  const [metadata, setMetadata] = useState<{ [key: string]: ProfileMetadata }>(
+    {}
+  )
+  const [drawnPdfs, setDrawnPdfs] = useState<PdfFile[]>([])
+
+  useEffect(() => {
+    users.forEach((user) => {
+      if (!(user.pubkey in metadata)) {
+        const metadataController = new MetadataController()
+
+        const handleMetadataEvent = (event: Event) => {
+          const metadataContent =
+            metadataController.extractProfileMetadataContent(event)
+          if (metadataContent)
+            setMetadata((prev) => ({
+              ...prev,
+              [user.pubkey]: metadataContent
+            }))
+        }
+
+        metadataController.on(user.pubkey, (kind: number, event: Event) => {
+          if (kind === kinds.Metadata) {
+            handleMetadataEvent(event)
+          }
+        })
+
+        metadataController
+          .findMetadata(user.pubkey)
+          .then((metadataEvent) => {
+            if (metadataEvent) handleMetadataEvent(metadataEvent)
+          })
+          .catch((err) => {
+            console.error(
+              `error occurred in finding metadata for: ${user.pubkey}`,
+              err
+            )
+          })
+      }
+    })
+  }, [])
   // Set up event listener for authentication event
   nostrController.on('nsecbunker-auth', (url) => {
     setAuthUrl(url)
@@ -297,6 +341,31 @@ export const CreatePage = () => {
     return fileHashes
   }
 
+  const createMarks = (fileHashes: { [key: string]: string }) : Mark[] => {
+    return drawnPdfs.flatMap((drawnPdf) => {
+      const fileHash = fileHashes[drawnPdf.file.name];
+      return drawnPdf.pages.flatMap((page, index) => {
+        return page.drawnFields.map((drawnField) => {
+          return {
+            type: drawnField.type,
+            location: {
+              page: index,
+              top: drawnField.top,
+              left: drawnField.left,
+              height: drawnField.height,
+              width: drawnField.width,
+            },
+            npub: drawnField.counterpart,
+            pdfFileHash: fileHash
+          }
+        })
+      })
+    })
+      .map((mark, index) => {
+        return {...mark, id: index }
+      });
+  }
+
   // Handle errors during zip file generation
   const handleZipError = (err: any) => {
     console.log('Error in zip:>> ', err)
@@ -309,15 +378,13 @@ export const CreatePage = () => {
   const generateZipFile = async (zip: JSZip): Promise<ArrayBuffer | null> => {
     setLoadingSpinnerDesc('Generating zip file')
 
-    const arraybuffer = await zip
+    return await zip
       .generateAsync({
         type: 'arraybuffer',
         compression: 'DEFLATE',
         compressionOptions: { level: 6 }
       })
       .catch(handleZipError)
-
-    return arraybuffer
   }
 
   // Encrypt the zip file with the generated encryption key
@@ -364,15 +431,13 @@ export const CreatePage = () => {
 
     if (!arraybuffer) return null
 
-    const finalZipFile = new File(
+    return new File(
       [new Blob([arraybuffer])],
       `${unixNow}.sigit.zip`,
       {
         type: 'application/zip'
       }
     )
-
-    return finalZipFile
   }
 
   // Handle errors during file upload
@@ -394,14 +459,12 @@ export const CreatePage = () => {
       type: 'application/sigit'
     })
 
-    const fileUrl = await uploadToFileStorage(file)
+    return await uploadToFileStorage(file)
       .then((url) => {
         toast.success('files.zip uploaded to file storage')
         return url
       })
       .catch(handleUploadError)
-
-    return fileUrl
   }
 
   // Manage offline scenarios for signing or viewing the file
@@ -425,15 +488,13 @@ export const CreatePage = () => {
       zip.file(file.name, file)
     })
 
-    const arraybuffer = await zip
+    return await zip
       .generateAsync({
         type: 'arraybuffer',
         compression: 'DEFLATE',
         compressionOptions: { level: 6 }
       })
       .catch(handleZipError)
-
-    return arraybuffer
   }
 
   const generateCreateSignature = async (
@@ -444,11 +505,13 @@ export const CreatePage = () => {
   ) => {
     const signers = users.filter((user) => user.role === UserRole.signer)
     const viewers = users.filter((user) => user.role === UserRole.viewer)
+    const markConfig = createMarks(fileHashes)
 
     const content: CreateSignatureEventContent = {
       signers: signers.map((signer) => hexToNpub(signer.pubkey)),
       viewers: viewers.map((viewer) => hexToNpub(viewer.pubkey)),
       fileHashes,
+      markConfig,
       zipUrl,
       title
     }
@@ -482,11 +545,9 @@ export const CreatePage = () => {
         : viewers.map((viewer) => viewer.pubkey)
     ).filter((receiver) => receiver !== usersPubkey)
 
-    const promises = receivers.map((receiver) =>
+    return receivers.map((receiver) =>
       sendNotification(receiver, meta)
     )
-
-    return promises
   }
 
   const handleCreate = async () => {
@@ -615,6 +676,10 @@ export const CreatePage = () => {
     }
   }
 
+  const onDrawFieldsChange = (pdfFiles: PdfFile[]) => {
+    setDrawnPdfs(pdfFiles)
+  }
+
   if (authUrl) {
     return (
       <iframe
@@ -629,7 +694,7 @@ export const CreatePage = () => {
   return (
     <>
       {isLoading && <LoadingSpinner desc={loadingSpinnerDesc} />}
-      <Box className={styles.container}>
+      <Container className={styles.container}>
         <TextField
           label="Title"
           value={title}
@@ -697,23 +762,34 @@ export const CreatePage = () => {
             </Box>
           </Box>
         </Box>
+
         <DisplayUser
+          metadata={metadata}
           users={users}
           handleUserRoleChange={handleUserRoleChange}
           handleRemoveUser={handleRemoveUser}
           moveSigner={moveSigner}
         />
-        <Box sx={{ mt: 1, display: 'flex', justifyContent: 'center' }}>
+
+        <DrawPDFFields
+          metadata={metadata}
+          users={users}
+          selectedFiles={selectedFiles}
+          onDrawFieldsChange={onDrawFieldsChange}
+        />
+
+        <Box sx={{ mt: 1, mb: 5, display: 'flex', justifyContent: 'center' }}>
           <Button onClick={handleCreate} variant="contained">
             Create
           </Button>
         </Box>
-      </Box>
+      </Container>
     </>
   )
 }
 
 type DisplayUsersProps = {
+  metadata: { [key: string]: ProfileMetadata }
   users: User[]
   handleUserRoleChange: (role: UserRole, pubkey: string) => void
   handleRemoveUser: (pubkey: string) => void
@@ -721,51 +797,12 @@ type DisplayUsersProps = {
 }
 
 const DisplayUser = ({
+  metadata,
   users,
   handleUserRoleChange,
   handleRemoveUser,
   moveSigner
 }: DisplayUsersProps) => {
-  const [metadata, setMetadata] = useState<{ [key: string]: ProfileMetadata }>(
-    {}
-  )
-
-  useEffect(() => {
-    users.forEach((user) => {
-      if (!(user.pubkey in metadata)) {
-        const metadataController = new MetadataController()
-
-        const handleMetadataEvent = (event: Event) => {
-          const metadataContent =
-            metadataController.extractProfileMetadataContent(event)
-          if (metadataContent)
-            setMetadata((prev) => ({
-              ...prev,
-              [user.pubkey]: metadataContent
-            }))
-        }
-
-        metadataController.on(user.pubkey, (kind: number, event: Event) => {
-          if (kind === kinds.Metadata) {
-            handleMetadataEvent(event)
-          }
-        })
-
-        metadataController
-          .findMetadata(user.pubkey)
-          .then((metadataEvent) => {
-            if (metadataEvent) handleMetadataEvent(metadataEvent)
-          })
-          .catch((err) => {
-            console.error(
-              `error occurred in finding metadata for: ${user.pubkey}`,
-              err
-            )
-          })
-      }
-    })
-  }, [users])
-
   return (
     <TableContainer component={Paper} elevation={3} sx={{ marginTop: '20px' }}>
       <Table>

src/pages/create/style.module.scss

@@ -6,6 +6,8 @@
   color: $text-color;
   margin-top: 10px;
   gap: 10px;
+  width: 550px;
+  max-width: 550px;
 
   .inputBlock {
     display: flex;

src/pages/sign/MarkFormField.tsx

@@ -0,0 +1,37 @@
+import { CurrentUserMark } from '../../types/mark.ts'
+import styles from './style.module.scss'
+import { Box, Button, TextField } from '@mui/material'
+
+import { MARK_TYPE_TRANSLATION } from '../../utils/const.ts'
+
+interface MarkFormFieldProps {
+  handleSubmit: (event: any) => void
+  handleChange: (event: any) => void
+  selectedMark: CurrentUserMark
+  selectedMarkValue: string
+}
+
+/**
+ * Responsible for rendering a form field connected to a mark and keeping track of its value.
+ */
+const MarkFormField = (props: MarkFormFieldProps) => {
+  const { handleSubmit, handleChange, selectedMark, selectedMarkValue } = props;
+  const getSubmitButton = () => selectedMark.isLast ? 'Complete' : 'Next';
+  return (
+    <div className={styles.fixedBottomForm}>
+      <Box component="form" onSubmit={handleSubmit}>
+        <TextField
+          id="mark-value"
+          label={MARK_TYPE_TRANSLATION[selectedMark.mark.type.valueOf()]}
+          value={selectedMarkValue}
+          onChange={handleChange}
+        />
+        <Button type="submit" variant="contained">
+          {getSubmitButton()}
+        </Button>
+      </Box>
+    </div>
+  )
+}
+
+export default MarkFormField;

src/pages/sign/index.tsx

@@ -16,13 +16,13 @@ import { State } from '../../store/rootReducer'
 import { CreateSignatureEventContent, Meta, SignedEvent } from '../../types'
 import {
   decryptArrayBuffer,
-  encryptArrayBuffer,
+  encryptArrayBuffer, extractMarksFromSignedMeta,
   extractZipUrlAndEncryptionKey,
   generateEncryptionKey,
-  generateKeysFile,
+  generateKeysFile, getFilesWithHashes,
   getHash,
   hexToNpub,
-  isOnline,
+  isOnline, loadZip,
   now,
   npubToHex,
   parseJson,
@@ -31,9 +31,19 @@ import {
   signEventForMetaFile,
   updateUsersAppData
 } from '../../utils'
+import { Container } from '../../components/Container'
 import { DisplayMeta } from './internal/displayMeta'
 import styles from './style.module.scss'
-import { Container } from '../../components/Container'
+import { PdfFile } from '../../types/drawing.ts'
+import { convertToPdfFile } from '../../utils/pdf.ts'
+import { CurrentUserMark, Mark } from '../../types/mark.ts'
+import { getLastSignersSig } from '../../utils/sign.ts'
+import {
+  filterMarksByPubkey,
+  getCurrentUserMarks,
+  isCurrentUserMarksComplete, updateMarks
+} from '../../utils'
+import PdfMarking from '../../components/PDFView/PdfMarking.tsx'
 enum SignedStatus {
   Fully_Signed,
   User_Is_Next_Signer,
@@ -59,7 +69,7 @@ export const SignPage = () => {
 
   const [selectedFile, setSelectedFile] = useState<File | null>(null)
 
-  const [files, setFiles] = useState<{ [filename: string]: ArrayBuffer }>({})
+  const [files, setFiles] = useState<{ [filename: string]: PdfFile }>({})
 
   const [isLoading, setIsLoading] = useState(true)
   const [loadingSpinnerDesc, setLoadingSpinnerDesc] = useState('')
@@ -71,6 +81,7 @@ export const SignPage = () => {
 
   const [signers, setSigners] = useState<`npub1${string}`[]>([])
   const [viewers, setViewers] = useState<`npub1${string}`[]>([])
+  const [marks, setMarks] = useState<Mark[] >([])
   const [creatorFileHashes, setCreatorFileHashes] = useState<{
     [key: string]: string
   }>({})
@@ -89,6 +100,8 @@ export const SignPage = () => {
 
   const [authUrl, setAuthUrl] = useState<string>()
   const nostrController = NostrController.getInstance()
+  const [currentUserMarks, setCurrentUserMarks] = useState<CurrentUserMark[]>([]);
+  const [isReadyToSign, setIsReadyToSign] = useState(false);
 
   useEffect(() => {
     if (signers.length > 0) {
@@ -179,6 +192,16 @@ export const SignPage = () => {
       setViewers(createSignatureContent.viewers)
       setCreatorFileHashes(createSignatureContent.fileHashes)
       setSubmittedBy(createSignatureEvent.pubkey)
+      setMarks(createSignatureContent.markConfig);
+
+      if (usersPubkey) {
+        const metaMarks = filterMarksByPubkey(createSignatureContent.markConfig, usersPubkey!)
+        const signedMarks = extractMarksFromSignedMeta(meta)
+        const currentUserMarks = getCurrentUserMarks(metaMarks, signedMarks);
+        setCurrentUserMarks(currentUserMarks);
+        // setCurrentUserMark(findNextCurrentUserMark(currentUserMarks) || null)
+        setIsReadyToSign(isCurrentUserMarksComplete(currentUserMarks))
+      }
 
       setSignedBy(Object.keys(meta.docSignatures) as `npub1${string}`[])
     }
@@ -189,6 +212,7 @@ export const SignPage = () => {
   }, [meta])
 
   useEffect(() => {
+    // online mode - from create and home page views
     if (metaInNavState) {
       const processSigit = async () => {
         setIsLoading(true)
@@ -263,16 +287,13 @@ export const SignPage = () => {
 
     if (!decrypted) return
 
-    const zip = await JSZip.loadAsync(decrypted).catch((err) => {
+    const zip = await loadZip(decrypted)
-      console.log('err in loading zip file :>> ', err)
+    if (!zip) {
-      toast.error(err.message || 'An error occurred in loading zip file.')
       setIsLoading(false)
-      return null
+      return
-    })
+    }
 
-    if (!zip) return
+    const files: { [filename: string]: PdfFile } = {}
-
-    const files: { [filename: string]: ArrayBuffer } = {}
     const fileHashes: { [key: string]: string | null } = {}
     const fileNames = Object.values(zip.files).map((entry) => entry.name)
 
@@ -286,7 +307,7 @@ export const SignPage = () => {
       )
 
       if (arrayBuffer) {
-        files[fileName] = arrayBuffer
+        files[fileName] = await convertToPdfFile(arrayBuffer, fileName);
 
         const hash = await getHash(arrayBuffer)
         if (hash) {
@@ -301,6 +322,11 @@ export const SignPage = () => {
     setCurrentFileHashes(fileHashes)
   }
 
+  const setUpdatedMarks = (markToUpdate: Mark) => {
+    const updatedMarks = updateMarks(marks, markToUpdate)
+    setMarks(updatedMarks)
+  }
+
   const parseKeysJson = async (zip: JSZip) => {
     const keysFileContent = await readContentOfZipEntry(
       zip,
@@ -310,25 +336,19 @@ export const SignPage = () => {
 
     if (!keysFileContent) return null
 
-    const parsedJSON = await parseJson<{ sender: string; keys: string[] }>(
+    return await parseJson<{ sender: string; keys: string[] }>(
       keysFileContent
     ).catch((err) => {
       console.log(`Error parsing content of keys.json:`, err)
       toast.error(err.message || `Error parsing content of keys.json`)
       return null
     })
-
-    return parsedJSON
   }
 
   const decrypt = async (file: File) => {
     setLoadingSpinnerDesc('Decrypting file')
 
-    const zip = await JSZip.loadAsync(file).catch((err) => {
+    const zip = await loadZip(file);
-      console.log('err in loading zip file :>> ', err)
-      toast.error(err.message || 'An error occurred in loading zip file.')
-      return null
-    })
     if (!zip) return
 
     const parsedKeysJson = await parseKeysJson(zip)
@@ -399,32 +419,27 @@ export const SignPage = () => {
 
     setLoadingSpinnerDesc('Parsing zip file')
 
-    const zip = await JSZip.loadAsync(decryptedZipFile).catch((err) => {
+    const zip = await loadZip(decryptedZipFile)
-      console.log('err in loading zip file :>> ', err)
-      toast.error(err.message || 'An error occurred in loading zip file.')
-      return null
-    })
-
     if (!zip) return
 
-    const files: { [filename: string]: ArrayBuffer } = {}
+    const files: { [filename: string]: PdfFile } = {}
     const fileHashes: { [key: string]: string | null } = {}
     const fileNames = Object.values(zip.files)
       .filter((entry) => entry.name.startsWith('files/') && !entry.dir)
       .map((entry) => entry.name)
+      .map((entry) => entry.replace(/^files\//, ''))
 
     // generate hashes for all entries in files folder of zipArchive
     // these hashes can be used to verify the originality of files
-    for (let fileName of fileNames) {
+    for (const fileName of fileNames) {
       const arrayBuffer = await readContentOfZipEntry(
         zip,
         fileName,
         'arraybuffer'
       )
 
-      fileName = fileName.replace(/^files\//, '')
       if (arrayBuffer) {
-        files[fileName] = arrayBuffer
+        files[fileName] = await convertToPdfFile(arrayBuffer, fileName);
 
         const hash = await getHash(arrayBuffer)
         if (hash) {
@@ -488,7 +503,10 @@ export const SignPage = () => {
     const prevSig = getPrevSignersSig(hexToNpub(usersPubkey!))
     if (!prevSig) return
 
-    const signedEvent = await signEventForMeta(prevSig)
+    const marks = getSignerMarksForMeta()
+    if (!marks) return
+
+    const signedEvent = await signEventForMeta({ prevSig, marks })
     if (!signedEvent) return
 
     const updatedMeta = updateMetaSignatures(meta, signedEvent)
@@ -502,14 +520,19 @@ export const SignPage = () => {
   }
 
   // Sign the event for the meta file
-  const signEventForMeta = async (prevSig: string) => {
+  const signEventForMeta = async (signerContent: { prevSig: string, marks: Mark[] }) => {
     return await signEventForMetaFile(
-      JSON.stringify({ prevSig }),
+      JSON.stringify(signerContent),
       nostrController,
       setIsLoading
     )
   }
 
+  const getSignerMarksForMeta = (): Mark[] | undefined => {
+    if (currentUserMarks.length === 0) return;
+    return currentUserMarks.map(( { mark }: CurrentUserMark) => mark);
+  }
+
   // Update the meta signatures
   const updateMetaSignatures = (meta: Meta, signedEvent: SignedEvent): Meta => {
     const metaCopy = _.cloneDeep(meta)
@@ -527,7 +550,7 @@ export const SignPage = () => {
     encryptionKey: string
   ): Promise<File | null> => {
     // Get the current timestamp in seconds
-    const unixNow = Math.floor(Date.now() / 1000)
+    const unixNow = now()
     const blob = new Blob([encryptedArrayBuffer])
     // Create a File object with the Blob data
     const file = new File([blob], `compressed.sigit`, {
@@ -577,15 +600,13 @@ export const SignPage = () => {
 
     if (!arraybuffer) return null
 
-    const finalZipFile = new File(
+    return new File(
       [new Blob([arraybuffer])],
       `${unixNow}.sigit.zip`,
       {
         type: 'application/zip'
       }
     )
-
-    return finalZipFile
   }
 
   // Handle errors during zip file generation
@@ -673,7 +694,9 @@ export const SignPage = () => {
     setIsLoading(true)
     setLoadingSpinnerDesc('Signing nostr event')
 
-    const prevSig = getLastSignersSig()
+    if (!meta) return;
+
+    const prevSig = getLastSignersSig(meta, signers)
     if (!prevSig) return
 
     const signedEvent = await signEventForMetaFile(
@@ -723,7 +746,7 @@ export const SignPage = () => {
     if (!arrayBuffer) return
 
     const blob = new Blob([arrayBuffer])
-    const unixNow = Math.floor(Date.now() / 1000)
+    const unixNow = now()
     saveAs(blob, `exported-${unixNow}.sigit.zip`)
 
     setIsLoading(false)
@@ -769,7 +792,7 @@ export const SignPage = () => {
     const finalZipFile = await createFinalZipFile(encryptedArrayBuffer, key)
 
     if (!finalZipFile) return
-    const unixNow = Math.floor(Date.now() / 1000)
+    const unixNow = now()
     saveAs(finalZipFile, `exported-${unixNow}.sigit.zip`)
   }
 
@@ -806,37 +829,6 @@ export const SignPage = () => {
     }
   }
 
-  /**
-   * This function returns the signature of last signer
-   * It will be used in the content of export signature's signedEvent
-   */
-  const getLastSignersSig = () => {
-    if (!meta) return null
-
-    // if there're no signers then use creator's signature
-    if (signers.length === 0) {
-      try {
-        const createSignatureEvent: Event = JSON.parse(meta.createSignature)
-        return createSignatureEvent.sig
-      } catch (error) {
-        return null
-      }
-    }
-
-    // get last signer
-    const lastSigner = signers[signers.length - 1]
-
-    // get the signature of last signer
-    try {
-      const lastSignatureEvent: Event = JSON.parse(
-        meta.docSignatures[lastSigner]
-      )
-      return lastSignatureEvent.sig
-    } catch (error) {
-      return null
-    }
-  }
-
   if (authUrl) {
     return (
       <iframe
@@ -848,76 +840,89 @@ export const SignPage = () => {
     )
   }
 
-  return (
+  if (isLoading) {
-    <>
+    return <LoadingSpinner desc={loadingSpinnerDesc} />
-      {isLoading && <LoadingSpinner desc={loadingSpinnerDesc} />}
+  }
-      <Container className={styles.container}>
-        {displayInput && (
-          <>
-            <Typography component="label" variant="h6">
-              Select sigit file
-            </Typography>
 
-            <Box className={styles.inputBlock}>
+  if (isReadyToSign) {
-              <MuiFileInput
+    return (
-                placeholder="Select file"
+      <>
-                inputProps={{ accept: '.sigit.zip' }}
+        <Container className={styles.container}>
-                value={selectedFile}
+          {displayInput && (
-                onChange={(value) => setSelectedFile(value)}
+            <>
+              <Typography component="label" variant="h6">
+                Select sigit file
+              </Typography>
+
+              <Box className={styles.inputBlock}>
+                <MuiFileInput
+                  placeholder="Select file"
+                  inputProps={{ accept: '.sigit.zip' }}
+                  value={selectedFile}
+                  onChange={(value) => setSelectedFile(value)}
+                />
+              </Box>
+
+              {selectedFile && (
+                <Box sx={{ mt: 2, display: 'flex', justifyContent: 'center' }}>
+                  <Button onClick={handleDecrypt} variant="contained">
+                    Decrypt
+                  </Button>
+                </Box>
+              )}
+            </>
+          )}
+
+          {submittedBy && Object.entries(files).length > 0 && meta && (
+            <>
+              <DisplayMeta
+                meta={meta}
+                files={files}
+                submittedBy={submittedBy}
+                signers={signers}
+                viewers={viewers}
+                creatorFileHashes={creatorFileHashes}
+                currentFileHashes={currentFileHashes}
+                signedBy={signedBy}
+                nextSigner={nextSinger}
+                getPrevSignersSig={getPrevSignersSig}
               />
-            </Box>
 
-            {selectedFile && (
+              {signedStatus === SignedStatus.Fully_Signed && (
-              <Box sx={{ mt: 2, display: 'flex', justifyContent: 'center' }}>
+                <Box sx={{ mt: 1, display: 'flex', justifyContent: 'center' }}>
-                <Button onClick={handleDecrypt} variant="contained">
+                  <Button onClick={handleExport} variant="contained">
-                  Decrypt
+                    Export
-                </Button>
+                  </Button>
-              </Box>
+                </Box>
-            )}
+              )}
-          </>
-        )}
 
-        {submittedBy && Object.entries(files).length > 0 && meta && (
+              {signedStatus === SignedStatus.User_Is_Next_Signer && (
-          <>
+                <Box sx={{ mt: 1, display: 'flex', justifyContent: 'center' }}>
-            <DisplayMeta
+                  <Button onClick={handleSign} variant="contained">
-              meta={meta}
+                    Sign
-              files={files}
+                  </Button>
-              submittedBy={submittedBy}
+                </Box>
-              signers={signers}
+              )}
-              viewers={viewers}
-              creatorFileHashes={creatorFileHashes}
-              currentFileHashes={currentFileHashes}
-              signedBy={signedBy}
-              nextSigner={nextSinger}
-              getPrevSignersSig={getPrevSignersSig}
-            />
 
-            {signedStatus === SignedStatus.Fully_Signed && (
+              {isSignerOrCreator && (
-              <Box sx={{ mt: 1, display: 'flex', justifyContent: 'center' }}>
+                <Box sx={{ mt: 1, display: 'flex', justifyContent: 'center' }}>
-                <Button onClick={handleExport} variant="contained">
+                  <Button onClick={handleExportSigit} variant="contained">
-                  Export
+                    Export Sigit
-                </Button>
+                  </Button>
-              </Box>
+                </Box>
-            )}
+              )}
+            </>
+          )}
+        </Container>
+      </>
+    )
+  }
 
-            {signedStatus === SignedStatus.User_Is_Next_Signer && (
+  return <PdfMarking
-              <Box sx={{ mt: 1, display: 'flex', justifyContent: 'center' }}>
+    files={getFilesWithHashes(files, currentFileHashes)}
-                <Button onClick={handleSign} variant="contained">
+    currentUserMarks={currentUserMarks}
-                  Sign
+    setIsReadyToSign={setIsReadyToSign}
-                </Button>
+    setCurrentUserMarks={setCurrentUserMarks}
-              </Box>
+    setUpdatedMarks={setUpdatedMarks}
-            )}
+  />
-
-            {isSignerOrCreator && (
-              <Box sx={{ mt: 1, display: 'flex', justifyContent: 'center' }}>
-                <Button onClick={handleExportSigit} variant="contained">
-                  Export Sigit
-                </Button>
-              </Box>
-            )}
-          </>
-        )}
-      </Container>
-    </>
-  )
 }

src/pages/sign/internal/displayMeta.tsx

@@ -34,10 +34,11 @@ import { UserAvatar } from '../../../components/UserAvatar'
 import { MetadataController } from '../../../controllers'
 import { npubToHex, shorten, hexToNpub, parseJson } from '../../../utils'
 import styles from '../style.module.scss'
+import { PdfFile } from '../../../types/drawing.ts'
 
 type DisplayMetaProps = {
   meta: Meta
-  files: { [filename: string]: ArrayBuffer }
+  files: { [filename: string]: PdfFile }
   submittedBy: string
   signers: `npub1${string}`[]
   viewers: `npub1${string}`[]
@@ -143,7 +144,7 @@ export const DisplayMeta = ({
   }, [users, submittedBy])
 
   const downloadFile = async (filename: string) => {
-    const arrayBuffer = files[filename]
+    const arrayBuffer = await files[filename].file.arrayBuffer()
     if (!arrayBuffer) return
 
     const blob = new Blob([arrayBuffer])

src/pages/sign/style.module.scss

@@ -2,6 +2,8 @@
 
 .container {
   color: $text-color;
+  width: 550px;
+  max-width: 550px;
 
   .inputBlock {
     position: relative;
@@ -47,4 +49,40 @@
       @extend .user;
     }
   }
+
+  .fixedBottomForm {
+    position: fixed;
+    bottom: 0;
+    left: 50%;
+    transform: translateX(-50%);
+    width: 100%;
+    max-width: 500px;
+    height: 100px;
+    border-top: 1px solid #ccc;
+    box-shadow: 0 -2px 5px rgba(0, 0, 0, 0.1);
+    padding: 10px 20px;
+    display: flex;
+    justify-content: center;
+    align-items: center;
+    //z-index: 200;
+  }
+
+  .fixedBottomForm input[type="text"] {
+    width: 80%;
+    padding: 10px;
+    font-size: 16px;
+    border: 1px solid #ccc;
+    border-radius: 4px;
+  }
+
+  .fixedBottomForm button {
+    background-color: #3f3d56;
+    color: white;
+    border: none;
+    padding: 10px 20px;
+    font-size: 16px;
+    margin-left: 10px;
+    border-radius: 4px;
+    cursor: pointer;
+  }
 }

src/pages/verify/index.tsx

@@ -15,7 +15,7 @@ import { useEffect, useState } from 'react'
 import { toast } from 'react-toastify'
 import { LoadingSpinner } from '../../components/LoadingSpinner'
 import { UserAvatar } from '../../components/UserAvatar'
-import { MetadataController } from '../../controllers'
+import { MetadataController, NostrController } from '../../controllers'
 import {
   CreateSignatureEventContent,
   Meta,
@@ -23,19 +23,30 @@ import {
   SignedEventContent
 } from '../../types'
 import {
-  decryptArrayBuffer,
+  decryptArrayBuffer, extractMarksFromSignedMeta,
   extractZipUrlAndEncryptionKey,
   getHash,
-  hexToNpub,
+  hexToNpub, now,
   npubToHex,
   parseJson,
   readContentOfZipEntry,
-  shorten
+  shorten, signEventForMetaFile
 } from '../../utils'
 import styles from './style.module.scss'
 import { Cancel, CheckCircle } from '@mui/icons-material'
 import { useLocation } from 'react-router-dom'
 import axios from 'axios'
+import { PdfFile } from '../../types/drawing.ts'
+import {
+  addMarks,
+  convertToPdfBlob,
+  convertToPdfFile,
+  groupMarksByPage,
+} from '../../utils/pdf.ts'
+import { State } from '../../store/rootReducer.ts'
+import { useSelector } from 'react-redux'
+import { getLastSignersSig } from '../../utils/sign.ts'
+import { saveAs } from 'file-saver'
 import { Container } from '../../components/Container'
 
 export const VerifyPage = () => {
@@ -67,10 +78,13 @@ export const VerifyPage = () => {
   const [currentFileHashes, setCurrentFileHashes] = useState<{
     [key: string]: string | null
   }>({})
+  const [files, setFiles] = useState<{ [filename: string]: PdfFile}>({})
 
   const [metadata, setMetadata] = useState<{ [key: string]: ProfileMetadata }>(
     {}
   )
+  const usersPubkey = useSelector((state: State) => state.auth.usersPubkey)
+  const nostrController = NostrController.getInstance()
 
   useEffect(() => {
     if (uploadedZip) {
@@ -125,6 +139,7 @@ export const VerifyPage = () => {
 
               if (!zip) return
 
+              const files: { [filename: string]: PdfFile } = {}
               const fileHashes: { [key: string]: string | null } = {}
               const fileNames = Object.values(zip.files).map(
                 (entry) => entry.name
@@ -140,6 +155,7 @@ export const VerifyPage = () => {
                 )
 
                 if (arrayBuffer) {
+                  files[fileName] = await convertToPdfFile(arrayBuffer, fileName!)
                   const hash = await getHash(arrayBuffer)
 
                   if (hash) {
@@ -151,6 +167,8 @@ export const VerifyPage = () => {
               }
 
               setCurrentFileHashes(fileHashes)
+              setFiles(files)
+
 
               setSigners(createSignatureContent.signers)
               setViewers(createSignatureContent.viewers)
@@ -159,6 +177,8 @@ export const VerifyPage = () => {
 
               setMeta(metaInNavState)
               setIsLoading(false)
+
+
             }
           })
           .catch((err) => {
@@ -360,6 +380,73 @@ export const VerifyPage = () => {
     }
   }
 
+  const handleExport = async () => {
+    if (Object.entries(files).length === 0 ||!meta ||!usersPubkey) return;
+
+    const usersNpub = hexToNpub(usersPubkey)
+    if (
+      !signers.includes(usersNpub) &&
+      !viewers.includes(usersNpub) &&
+      submittedBy !== usersNpub
+    ) {
+      return
+    }
+
+    setIsLoading(true)
+    setLoadingSpinnerDesc('Signing nostr event')
+
+    if (!meta) return;
+
+    const prevSig = getLastSignersSig(meta, signers)
+    if (!prevSig) return;
+
+    const signedEvent = await signEventForMetaFile(
+      JSON.stringify({ prevSig }),
+      nostrController,
+      setIsLoading
+    )
+
+    if (!signedEvent) return;
+
+    const exportSignature = JSON.stringify(signedEvent, null, 2)
+    const updatedMeta = {...meta, exportSignature }
+    const stringifiedMeta = JSON.stringify(updatedMeta, null, 2)
+
+    const zip = new JSZip()
+    zip.file('meta.json', stringifiedMeta)
+
+    const marks = extractMarksFromSignedMeta(updatedMeta)
+    const marksByPage = groupMarksByPage(marks)
+
+    for (const [fileName, pdf] of Object.entries(files)) {
+      const pages = await addMarks(pdf.file, marksByPage)
+      const blob = await convertToPdfBlob(pages)
+      zip.file(`/files/${fileName}`, blob)
+    }
+
+    const arrayBuffer = await zip
+      .generateAsync({
+        type: 'arraybuffer',
+        compression: 'DEFLATE',
+        compressionOptions: {
+          level: 6
+        }
+      })
+      .catch((err) => {
+        console.log('err in zip:>> ', err)
+        setIsLoading(false)
+        toast.error(err.message || 'Error occurred in generating zip file')
+        return null
+      })
+
+    if (!arrayBuffer) return
+
+    const blob = new Blob([arrayBuffer])
+    saveAs(blob, `exported-${now()}.sigit.zip`)
+
+    setIsLoading(false)
+  }
+
   const displayUser = (pubkey: string, verifySignature = false) => {
     const profile = metadata[pubkey]
 
@@ -522,6 +609,11 @@ export const VerifyPage = () => {
                   Exported By
                 </Typography>
                 {displayExportedBy()}
+                <Box sx={{ mt: 1, display: 'flex', justifyContent: 'center' }}>
+                  <Button onClick={handleExport} variant="contained">
+                    Export Sigit
+                  </Button>
+                </Box>
               </ListItem>
 
               {signers.length > 0 && (

src/types/core.ts

@@ -1,3 +1,4 @@
+import { Mark } from './mark'
 import { Keys } from '../store/auth/types'
 
 export enum UserRole {
@@ -22,12 +23,14 @@ export interface CreateSignatureEventContent {
   signers: `npub1${string}`[]
   viewers: `npub1${string}`[]
   fileHashes: { [key: string]: string }
+  markConfig: Mark[]
   title: string
   zipUrl: string
 }
 
 export interface SignedEventContent {
   prevSig: string
+  marks: Mark[]
 }
 
 export interface Sigit {

src/types/drawing.ts

@@ -0,0 +1,49 @@
+export interface MouseState {
+  clicked?: boolean
+  dragging?: boolean
+  resizing?: boolean
+  coordsInWrapper?: {
+    mouseX: number
+    mouseY: number
+  }
+}
+
+export interface PdfFile {
+  file: File,
+  pages: PdfPage[]
+  expanded?: boolean
+}
+
+export interface PdfPage {
+  image: string
+  drawnFields: DrawnField[]
+}
+
+export interface DrawnField {
+  left: number
+  top: number
+  width: number
+  height: number
+  type: MarkType
+  /**
+   * npub of a counter part
+   */
+  counterpart: string
+}
+
+export interface DrawTool {
+  identifier: MarkType
+  label: string
+  icon: JSX.Element,
+  defaultValue?: string
+  selected?: boolean
+  active?: boolean
+}
+
+export enum MarkType {
+  SIGNATURE = 'SIGNATURE',
+  JOBTITLE = 'JOBTITLE',
+  FULLNAME = 'FULLNAME',
+  DATE = 'DATE',
+  DATETIME = 'DATETIME'
+}

src/types/mark.ts

@@ -0,0 +1,77 @@
+import { MarkType } from "./drawing";
+
+export interface CurrentUserMark {
+  mark: Mark
+  isLast: boolean
+  isCompleted: boolean
+}
+
+export interface Mark {
+  id: number;
+  npub: string;
+  pdfFileHash: string;
+  type: MarkType;
+  location: MarkLocation;
+  value?: string;
+}
+
+export interface MarkLocation {
+  top: number;
+  left: number;
+  height: number;
+  width: number;
+  page: number;
+}
+
+// Creator Meta Object Example
+const creatorMetaExample = {
+  "fileHashes": {
+    // PDF Hash
+    "Lorem ipsum dolor sit amet.pdf": "da5f857e77d3aa59c461efad804116931c059b36e6b4da0b5d9452753ec70c05",
+    // PDF Pages (in png format) hashes
+    // Page 1
+    "da5f857e77d3aa59c461efad804116931c059b36e6b4da0b5d9452753ec70c05/1.png": "hash123png1",
+    // Page 2
+    "da5f857e77d3aa59c461efad804116931c059b36e6b4da0b5d9452753ec70c05/2.png": "hash321png2"
+  },
+  "markConfig": {
+    // Signer npub
+    'npub1x77qywdllzetv9ncnhlfpv62kshlgtt0uqlsq3v22uzzkk2xvvrsn6uyfy': {
+        // PDF Page 1 (PNG file hash)
+        'da5f857e77d3aa59c461efad804116931c059b36e6b4da0b5d9452753ec70c05/1.png': [
+            {
+                markType: "FULLNAME",
+                markLocation: "X:56;Y:306"
+            }
+        ],
+        // PDF Page 2 (PNG file hash)
+        'da5f857e77d3aa59c461efad804116931c059b36e6b4da0b5d9452753ec70c05/2.png': [
+            {
+                markType: "FULLNAME",
+                markLocation: "X:76;Y:283.71875"
+            }
+        ]
+    }
+  }
+}
+
+// Signer meta example
+const signerExample = {
+  "prevSig": "10de030dd2bfafbbd34969645bd0b3f5e8ab71b3b32091fb29bbea5e272f8a3b7284ef667b6a02e9becc1036450d9fbe5c1c6d146fa91d70e0d8f3cd54d64f17",
+  "marks": {
+    // PDF Page 1 (PNG file hash)
+    'da5f857e77d3aa59c461efad804116931c059b36e6b4da0b5d9452753ec70c05/1.png': {
+      // Mark coordinates
+      "X:56;Y:306": {
+        value: 'Pera Peric'
+      }
+    },
+    // PDF Page 2 (PNG file hash)
+    'da5f857e77d3aa59c461efad804116931c059b36e6b4da0b5d9452753ec70c05/2.png': {
+      // Mark coordinates
+      "X:76;Y:283.71875": {
+        value: 'Pera Peric'
+      }
+    }
+  }
+}

src/types/profile.ts

@@ -1,6 +1,7 @@
 export interface ProfileMetadata {
   name?: string
   display_name?: string
+  username?: string
   picture?: string
   banner?: string
   about?: string

src/types/zip.ts

@@ -1,4 +1,4 @@
-export interface OutputByType {
+  export interface OutputByType {
   base64: string
   string: string
   text: string
@@ -10,4 +10,17 @@ export interface OutputByType {
   nodebuffer: Buffer
 }
 
+interface InputByType {
+  base64: string;
+  string: string;
+  text: string;
+  binarystring: string;
+  array: number[];
+  uint8array: Uint8Array;
+  arraybuffer: ArrayBuffer;
+  blob: Blob;
+  stream: NodeJS.ReadableStream;
+}
+
 export type OutputType = keyof OutputByType
+export type InputFileFormat = InputByType[keyof InputByType] | Promise<InputByType[keyof InputByType]>;

src/utils/const.ts

@@ -0,0 +1,6 @@
+import { MarkType } from '../types/drawing.ts'
+
+export const EMPTY: string = ''
+export const MARK_TYPE_TRANSLATION: { [key: string]: string } = {
+  [MarkType.FULLNAME.valueOf()]: 'Full Name'
+}

src/utils/index.ts

@@ -6,3 +6,4 @@ export * from './nostr'
 export * from './string'
 export * from './zip'
 export * from './utils'
+export * from './mark'

src/utils/mark.ts

@@ -0,0 +1,98 @@
+import { CurrentUserMark, Mark } from '../types/mark.ts'
+import { hexToNpub } from './nostr.ts'
+import { Meta, SignedEventContent } from '../types'
+import { Event } from 'nostr-tools'
+
+/**
+ * Takes in an array of Marks already filtered by User.
+ * Returns an array of CurrentUserMarks with correct values mix-and-matched.
+ * @param marks - default Marks extracted from Meta
+ * @param signedMetaMarks - signed user Marks extracted from DocSignatures
+ */
+const getCurrentUserMarks = (marks: Mark[], signedMetaMarks: Mark[]): CurrentUserMark[] => {
+  return marks.map((mark, index, arr) => {
+    const signedMark = signedMetaMarks.find((m) => m.id === mark.id);
+    if (signedMark && !!signedMark.value) {
+      mark.value = signedMark.value
+    }
+    return {
+      mark,
+      isLast: isLast(index, arr),
+      isCompleted: !!mark.value
+    }
+  })
+}
+
+/**
+ * Returns next incomplete CurrentUserMark if there is one
+ * @param usersMarks
+ */
+const findNextCurrentUserMark = (usersMarks: CurrentUserMark[]): CurrentUserMark | undefined => {
+  return usersMarks.find((mark) => !mark.isCompleted);
+}
+
+/**
+ * Returns Marks that are assigned to a specific user
+ * @param marks
+ * @param pubkey
+ */
+const filterMarksByPubkey = (marks: Mark[], pubkey: string): Mark[] => {
+  return marks.filter(mark => mark.npub === hexToNpub(pubkey))
+}
+
+/**
+ * Takes Signed Doc Signatures part of Meta and extracts
+ * all Marks into one flar array, regardless of the user.
+ * @param meta
+ */
+const extractMarksFromSignedMeta = (meta: Meta): Mark[] => {
+  return Object.values(meta.docSignatures)
+    .map((val: string) => JSON.parse(val as string))
+    .map((val: Event) => JSON.parse(val.content))
+    .flatMap((val: SignedEventContent) => val.marks)
+}
+
+/**
+ * Checks the CurrentUserMarks array that every element in that array has been
+ * marked as complete.
+ * @param currentUserMarks
+ */
+const isCurrentUserMarksComplete = (currentUserMarks: CurrentUserMark[]): boolean => {
+  return currentUserMarks.every((mark) => mark.isCompleted)
+}
+
+/**
+ * Inserts an updated mark into an existing array of marks. Returns a copy of the
+ * existing array with a new value inserted
+ * @param marks
+ * @param markToUpdate
+ */
+const updateMarks = (marks: Mark[], markToUpdate: Mark): Mark[] => {
+  const indexToUpdate = marks.findIndex(mark => mark.id === markToUpdate.id);
+  return [
+    ...marks.slice(0, indexToUpdate),
+    markToUpdate,
+    ...marks.slice(indexToUpdate + 1)
+  ]
+}
+
+const updateCurrentUserMarks = (currentUserMarks: CurrentUserMark[], markToUpdate: CurrentUserMark): CurrentUserMark[] => {
+  const indexToUpdate = currentUserMarks.findIndex((m) => m.mark.id === markToUpdate.mark.id)
+  return [
+    ...currentUserMarks.slice(0, indexToUpdate),
+    markToUpdate,
+    ...currentUserMarks.slice(indexToUpdate + 1)
+  ]
+}
+
+const isLast = <T>(index: number, arr: T[]) => (index === (arr.length -1))
+
+export {
+  getCurrentUserMarks,
+  filterMarksByPubkey,
+  extractMarksFromSignedMeta,
+  isCurrentUserMarksComplete,
+  findNextCurrentUserMark,
+  updateMarks,
+  updateCurrentUserMarks,
+}

src/utils/misc.ts

@@ -83,14 +83,12 @@ export const signEventForMetaFile = async (
   }
 
   // Sign the event
-  const signedEvent = await nostrController.signEvent(event).catch((err) => {
+  return await nostrController.signEvent(event).catch((err) => {
     console.error(err)
     toast.error(err.message || 'Error occurred in signing nostr event')
     setIsLoading(false) // Set loading state to false
     return null
   })
-
-  return signedEvent // Return the signed event
 }
 
 /**

src/utils/nostr.ts

@@ -120,7 +120,7 @@ export const queryNip05 = async (
   if (!match) throw new Error('Invalid nip05')
 
   // Destructure the match result, assigning default value '_' to name if not provided
-  const [_, name = '_', domain] = match
+  const [name = '_', domain] = match
 
   // Construct the URL to query the NIP-05 data
   const url = `https://${domain}/.well-known/nostr.json?name=${name}`

src/utils/pdf.ts

@@ -0,0 +1,256 @@
+import { PdfFile, PdfPage } from '../types/drawing.ts'
+import * as PDFJS from 'pdfjs-dist'
+import { PDFDocument } from 'pdf-lib'
+import { Mark } from '../types/mark.ts'
+
+PDFJS.GlobalWorkerOptions.workerSrc = 'node_modules/pdfjs-dist/build/pdf.worker.mjs';
+
+/**
+ * Scale between the PDF page's natural size and rendered size
+ * @constant {number}
+ */
+const SCALE: number = 3;
+/**
+ * Defined font size used when generating a PDF. Currently it is difficult to fully
+ * correlate font size used at the time of filling in / drawing on the PDF
+ * because it is dynamically rendered, and the final size.
+ * This should be fixed going forward.
+ * Switching to PDF-Lib will most likely make this problem redundant.
+ */
+const FONT_SIZE: number = 40;
+/**
+ * Current font type used when generating a PDF.
+ */
+const FONT_TYPE: string = 'Arial';
+
+/**
+ * Converts a PDF ArrayBuffer to a generic PDF File
+ * @param arrayBuffer of a PDF
+ * @param fileName identifier of the pdf file
+ */
+const toFile = (arrayBuffer: ArrayBuffer, fileName: string) : File => {
+  const blob = new Blob([arrayBuffer], { type: "application/pdf" });
+  return new File([blob], fileName, { type: "application/pdf" });
+}
+
+/**
+ * Converts a generic PDF File to Sigit's internal Pdf File type
+ * @param {File} file
+ * @return {PdfFile} Sigit's internal PDF File type
+ */
+const toPdfFile = async (file: File): Promise<PdfFile> => {
+  const data = await readPdf(file)
+  const pages = await pdfToImages(data)
+  return { file, pages, expanded: false }
+}
+/**
+ * Transforms an array of generic PDF Files into an array of Sigit's
+ * internal representation of Pdf Files
+ * @param selectedFiles - an array of generic PDF Files
+ * @return PdfFile[] - an array of Sigit's internal Pdf File type
+ */
+const toPdfFiles = async (selectedFiles: File[]): Promise<PdfFile[]> => {
+  return Promise.all(selectedFiles
+    .filter(isPdf)
+    .map(toPdfFile));
+}
+
+/**
+ * A utility that transforms a drawing coordinate number into a CSS-compatible string
+ * @param coordinate
+ */
+const inPx = (coordinate: number): string => `${coordinate}px`;
+
+/**
+ * A utility that checks if a given file is of the pdf type
+ * @param file
+ */
+const isPdf = (file: File) => file.type.toLowerCase().includes('pdf');
+
+/**
+ * Reads the pdf file binaries
+ */
+const readPdf = (file: File): Promise<string> => {
+  return new Promise((resolve, reject) => {
+    const reader = new FileReader();
+
+    reader.onload = (e: any) => {
+      const data = e.target.result
+
+      resolve(data)
+    };
+
+    reader.onerror = (err) => {
+      console.error('err', err)
+      reject(err)
+    };
+
+    reader.readAsDataURL(file);
+  })
+}
+
+/**
+ * Converts pdf to the images
+ * @param data pdf file bytes
+ */
+const pdfToImages = async (data: any): Promise<PdfPage[]> => {
+  const images: string[] = [];
+  const pdf = await PDFJS.getDocument(data).promise;
+  const canvas = document.createElement("canvas");
+
+  for (let i = 0; i < pdf.numPages; i++) {
+    const page = await pdf.getPage(i + 1);
+    const viewport = page.getViewport({ scale: SCALE });
+    const context = canvas.getContext("2d");
+    canvas.height = viewport.height;
+    canvas.width = viewport.width;
+    await page.render({ canvasContext: context!, viewport: viewport }).promise;
+    images.push(canvas.toDataURL());
+  }
+
+  return Promise.resolve(images.map((image) => {
+    return {
+      image,
+      drawnFields: []
+    }
+  }))
+}
+
+/**
+ * Takes in individual pdf file and an object with Marks grouped by Page number
+ * Returns an array of encoded images where each image is a representation
+ * of a PDF page with completed and signed marks from all users
+ */
+const addMarks = async (file: File, marksPerPage: {[key: string]: Mark[]}) => {
+  const p = await readPdf(file);
+  const pdf = await PDFJS.getDocument(p).promise;
+  const canvas = document.createElement("canvas");
+
+  const images: string[] = [];
+
+  for (let i = 0; i< pdf.numPages; i++) {
+    const page = await pdf.getPage(i+1)
+    const viewport = page.getViewport({ scale: SCALE });
+    const context = canvas.getContext("2d");
+    canvas.height = viewport.height;
+    canvas.width = viewport.width;
+    await page.render({ canvasContext: context!, viewport: viewport }).promise;
+
+    marksPerPage[i].forEach(mark => draw(mark, context!))
+
+    images.push(canvas.toDataURL());
+  }
+
+  return Promise.resolve(images);
+}
+
+/**
+ * Utility to scale mark in line with the PDF-to-PNG scale
+ */
+const scaleMark = (mark: Mark): Mark => {
+  const { location } = mark;
+  return {
+    ...mark,
+    location: {
+      ...location,
+      width: location.width * SCALE,
+      height: location.height * SCALE,
+      left: location.left * SCALE,
+      top: location.top * SCALE
+    }
+  }
+}
+
+/**
+ * Utility to check if a Mark has value
+ * @param mark
+ */
+const hasValue = (mark: Mark): boolean => !!mark.value;
+
+/**
+ * Draws a Mark on a Canvas representation of a PDF Page
+ * @param mark to be drawn
+ * @param ctx a Canvas representation of a specific PDF Page
+ */
+const draw = (mark: Mark, ctx: CanvasRenderingContext2D) => {
+  const { location } = mark;
+
+  ctx!.font = FONT_SIZE + 'px ' + FONT_TYPE;
+  ctx!.fillStyle = 'black';
+  const textMetrics = ctx!.measureText(mark.value!);
+  const textX = location.left + (location.width - textMetrics.width) / 2;
+  const textY = location.top + (location.height + parseInt(ctx!.font)) / 2;
+  ctx!.fillText(mark.value!, textX, textY);
+}
+
+/**
+ * Takes an array of encoded PDF pages and returns a blob that is a complete PDF file
+ * @param markedPdfPages
+ */
+const convertToPdfBlob = async (markedPdfPages: string[]): Promise<Blob> => {
+  const pdfDoc = await PDFDocument.create();
+
+  for (const page of markedPdfPages) {
+    const pngImage = await pdfDoc.embedPng(page)
+    const p = pdfDoc.addPage([pngImage.width, pngImage.height])
+    p.drawImage(pngImage, {
+      x: 0,
+      y: 0,
+      width: pngImage.width,
+      height: pngImage.height
+    })
+  }
+
+  const pdfBytes = await pdfDoc.save()
+  return new Blob([pdfBytes], { type: 'application/pdf' })
+
+}
+
+/**
+ * Takes an ArrayBuffer of a PDF file and converts to Sigit's Internal Pdf File type
+ * @param arrayBuffer
+ * @param fileName
+ */
+const convertToPdfFile = async (arrayBuffer: ArrayBuffer, fileName: string): Promise<PdfFile> => {
+  const file = toFile(arrayBuffer, fileName);
+  return toPdfFile(file);
+}
+
+/**
+ * @param marks - an array of Marks
+ * @function hasValue removes any Mark without a property
+ * @function scaleMark scales remaining marks in line with SCALE
+ * @function byPage groups remaining Marks by their page marks.location.page
+ */
+const groupMarksByPage = (marks: Mark[]) => {
+  return marks
+    .filter(hasValue)
+    .map(scaleMark)
+    .reduce<{[key: number]: Mark[]}>(byPage, {})
+}
+
+/**
+ * A reducer callback that transforms an array of marks into an object grouped by the page number
+ * Can be replaced by Object.groupBy https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/groupBy
+ * when it is implemented in TypeScript
+ * Implementation is standard from the Array.prototype.reduce documentation
+ * @param obj - accumulator in the reducer callback
+ * @param mark - current value, i.e. Mark being examined
+ */
+const byPage = (obj: { [key: number]: Mark[]}, mark: Mark) => {
+  const key = mark.location.page;
+  const curGroup = obj[key] ?? [];
+  return { ...obj, [key]: [...curGroup, mark]
+  }
+}
+
+export {
+  toFile,
+  toPdfFile,
+  toPdfFiles,
+  inPx,
+  convertToPdfFile,
+  addMarks,
+  convertToPdfBlob,
+  groupMarksByPage,
+}

src/utils/sign.ts

@@ -0,0 +1,33 @@
+import { Event } from 'nostr-tools'
+import { Meta } from '../types'
+
+/**
+ * This function returns the signature of last signer
+ * It will be used in the content of export signature's signedEvent
+ */
+const getLastSignersSig = (meta: Meta, signers: `npub1${string}`[]): string | null => {
+  // if there're no signers then use creator's signature
+  if (signers.length === 0) {
+    try {
+      const createSignatureEvent: Event = JSON.parse(meta.createSignature)
+      return createSignatureEvent.sig
+    } catch (error) {
+      return null
+    }
+  }
+
+  // get last signer
+  const lastSigner = signers[signers.length - 1]
+
+  // get the signature of last signer
+  try {
+    const lastSignatureEvent: Event = JSON.parse(
+      meta.docSignatures[lastSigner]
+    )
+    return lastSignatureEvent.sig
+  } catch (error) {
+    return null
+  }
+}
+
+export { getLastSignersSig }

src/utils/utils.ts

@@ -1,3 +1,5 @@
+import { PdfFile } from '../types/drawing.ts'
+
 export const compareObjects = (
   obj1: object | null | undefined,
   obj2: object | null | undefined
@@ -64,3 +66,17 @@ export const timeout = (ms: number = 60000) => {
     }, ms) // Timeout duration in milliseconds
   })
 }
+/**
+ * Creates a flat array where each object contains all required information about a Pdf File,
+ * including its name, hash, and content
+ * @param files
+ * @param fileHashes
+ */
+export const getFilesWithHashes = (
+  files: { [filename: string ]: PdfFile },
+  fileHashes: { [key: string]: string | null }
+  ) => {
+  return Object.entries(files).map(([filename, pdfFile]) => {
+    return { pdfFile, filename, hash: fileHashes[filename] }
+  })
+}

src/utils/zip.ts

@@ -1,6 +1,6 @@
 import JSZip from 'jszip'
 import { toast } from 'react-toastify'
-import { OutputByType, OutputType } from '../types'
+import { InputFileFormat, OutputByType, OutputType } from '../types'
 
 /**
  * Read the content of a file within a zip archive.
@@ -9,7 +9,7 @@ import { OutputByType, OutputType } from '../types'
  * @param outputType The type of output to return (e.g., 'string', 'arraybuffer', 'uint8array', etc.).
  * @returns A Promise resolving to the content of the file, or null if an error occurs.
  */
-export const readContentOfZipEntry = async <T extends OutputType>(
+const readContentOfZipEntry = async <T extends OutputType>(
   zip: JSZip,
   filePath: string,
   outputType: T
@@ -22,8 +22,9 @@ export const readContentOfZipEntry = async <T extends OutputType>(
     return null
   }
 
-  // Read the content of the zip entry asynchronously
+  // Read and return the content of the zip entry asynchronously
-  const fileContent = await zipEntry.async(outputType).catch((err) => {
+  // or null if an error has occurred
+  return await zipEntry.async(outputType).catch((err) => {
     // Handle any errors that occur during the read operation
     console.log(`Error reading content of ${filePath}:`, err)
     toast.error(
@@ -31,7 +32,21 @@ export const readContentOfZipEntry = async <T extends OutputType>(
     )
     return null
   })
-
-  // Return the file content or null if an error occurred
-  return fileContent
 }
+
+const loadZip = async (data: InputFileFormat): Promise<JSZip | null> => {
+  try {
+    return await JSZip.loadAsync(data);
+  } catch (err: any) {
+    console.log('err in loading zip file :>> ', err)
+    toast.error(err.message || 'An error occurred in loading zip file.')
+    return null;
+  }
+}
+
+export {
+  readContentOfZipEntry,
+  loadZip
+}
+
+