refactor: rename Files to StickySideColumns and update css

src/components/DisplaySigit/index.tsx

@@ -1,9 +1,6 @@
-import { useEffect, useState } from 'react'
-import { Meta, ProfileMetadata } from '../../types'
+import { Meta } from '../../types'
 import { SigitCardDisplayInfo, SigitStatus } from '../../utils'
-import { Event, kinds } from 'nostr-tools'
 import { Link } from 'react-router-dom'
-import { MetadataController } from '../../controllers'
 import { formatTimestamp, hexToNpub, npubToHex, shorten } from '../../utils'
 import { appPublicRoutes, appPrivateRoutes } from '../../routes'
 import { Button, Divider, Tooltip } from '@mui/material'
@@ -22,6 +19,7 @@ import { UserAvatarGroup } from '../UserAvatarGroup'
 import styles from './style.module.scss'
 import { TooltipChild } from '../TooltipChild'
 import { getExtensionIconLabel } from '../getExtensionIconLabel'
+import { useSigitProfiles } from '../../hooks/useSigitProfiles'
 
 type SigitProps = {
   meta: Meta
@@ -38,61 +36,10 @@ export const DisplaySigit = ({ meta, parsedMeta }: SigitProps) => {
     fileExtensions
   } = parsedMeta
 
-  const [profiles, setProfiles] = useState<{ [key: string]: ProfileMetadata }>(
-    {}
-  )
-
-  useEffect(() => {
-    const hexKeys = new Set<string>([
-      ...signers.map((signer) => npubToHex(signer)!)
-    ])
-
-    if (submittedBy) {
-      hexKeys.add(npubToHex(submittedBy)!)
-    }
-
-    const metadataController = new MetadataController()
-
-    const handleMetadataEvent = (key: string) => (event: Event) => {
-      const metadataContent =
-        metadataController.extractProfileMetadataContent(event)
-
-      if (metadataContent) {
-        setProfiles((prev) => ({
-          ...prev,
-          [key]: metadataContent
-        }))
-      }
-    }
-
-    const handleEventListener =
-      (key: string) => (kind: number, event: Event) => {
-        if (kind === kinds.Metadata) {
-          handleMetadataEvent(key)(event)
-        }
-      }
-
-    hexKeys.forEach((key) => {
-      if (!(key in profiles)) {
-        metadataController.on(key, handleEventListener(key))
-
-        metadataController
-          .findMetadata(key)
-          .then((metadataEvent) => {
-            if (metadataEvent) handleMetadataEvent(key)(metadataEvent)
-          })
-          .catch((err) => {
-            console.error(`error occurred in finding metadata for: ${key}`, err)
-          })
-      }
-    })
-
-    return () => {
-      hexKeys.forEach((key) => {
-        metadataController.off(key, handleEventListener(key))
-      })
-    }
-  }, [submittedBy, signers, profiles])
+  const profiles = useSigitProfiles([
+    ...(submittedBy ? [submittedBy] : []),
+    ...signers
+  ])
 
   return (
     <div className={styles.itemWrapper}>
@@ -130,7 +77,7 @@ export const DisplaySigit = ({ meta, parsedMeta }: SigitProps) => {
         {submittedBy && signers.length ? (
           <Divider orientation="vertical" flexItem />
         ) : null}
-        <UserAvatarGroup className={styles.signers} max={7}>
+        <UserAvatarGroup max={7}>
           {signers.map((signer) => {
             const pubkey = npubToHex(signer)!
             const profile = profiles[pubkey]

src/components/DisplaySigit/style.module.scss

@@ -93,26 +93,6 @@
   grid-gap: 10px;
 }
 
-.signers {
-  padding: 0 0 0 10px;
-
-  > * {
-    transition: margin ease 0.2s;
-    margin: 0 0 0 -10px;
-    position: relative;
-    z-index: 1;
-    &:first-child {
-      margin-left: -10px !important;
-    }
-  }
-
-  > *:hover,
-  > *:focus-within {
-    margin: 0 15px 0 5px;
-    z-index: 2;
-  }
-}
-
 .details {
   color: rgba(0, 0, 0, 0.3);
   font-size: 14px;

src/components/FilesUsers.tsx/index.tsx

@@ -0,0 +1,246 @@
+import { CheckCircle, Cancel } from '@mui/icons-material'
+import { Divider, Tooltip } from '@mui/material'
+import { verifyEvent } from 'nostr-tools'
+import { useSigitProfiles } from '../../hooks/useSigitProfiles'
+import { Meta, SignedEventContent } from '../../types'
+import {
+  extractFileExtensions,
+  formatTimestamp,
+  fromUnixTimestamp,
+  hexToNpub,
+  npubToHex,
+  shorten
+} from '../../utils'
+import { UserAvatar } from '../UserAvatar'
+import { useSigitMeta } from '../../hooks/useSigitMeta'
+import { UserAvatarGroup } from '../UserAvatarGroup'
+
+import styles from './style.module.scss'
+import { FontAwesomeIcon } from '@fortawesome/react-fontawesome'
+import {
+  faCalendar,
+  faCalendarCheck,
+  faCalendarPlus,
+  faEye,
+  faFile,
+  faFileCircleExclamation
+} from '@fortawesome/free-solid-svg-icons'
+import { getExtensionIconLabel } from '../getExtensionIconLabel'
+import { useSelector } from 'react-redux'
+import { State } from '../../store/rootReducer'
+
+interface FileUsersProps {
+  meta: Meta
+}
+
+export const FileUsers = ({ meta }: FileUsersProps) => {
+  const { usersPubkey } = useSelector((state: State) => state.auth)
+  const {
+    submittedBy,
+    signers,
+    viewers,
+    fileHashes,
+    sig,
+    docSignatures,
+    parsedSignatureEvents,
+    createdAt,
+    signedStatus,
+    completedAt
+  } = useSigitMeta(meta)
+  const profiles = useSigitProfiles([
+    ...(submittedBy ? [submittedBy] : []),
+    ...signers,
+    ...viewers
+  ])
+  const userCanSign =
+    typeof usersPubkey !== 'undefined' &&
+    signers.includes(hexToNpub(usersPubkey))
+
+  const ext = extractFileExtensions(Object.keys(fileHashes))
+
+  const getPrevSignersSig = (npub: string) => {
+    // if user is first signer then use creator's signature
+    if (signers[0] === npub) {
+      return sig
+    }
+
+    // find the index of signer
+    const currentSignerIndex = signers.findIndex((signer) => signer === npub)
+    // return null if could not found user in signer's list
+    if (currentSignerIndex === -1) return null
+    // find prev signer
+    const prevSigner = signers[currentSignerIndex - 1]
+
+    // get the signature of prev signer
+    try {
+      const prevSignersEvent = parsedSignatureEvents[prevSigner]
+      return prevSignersEvent.sig
+    } catch (error) {
+      return null
+    }
+  }
+
+  const displayUser = (pubkey: string, verifySignature = false) => {
+    const profile = profiles[pubkey]
+
+    let isValidSignature = false
+
+    if (verifySignature) {
+      const npub = hexToNpub(pubkey)
+      const signedEventString = docSignatures[npub]
+      if (signedEventString) {
+        try {
+          const signedEvent = JSON.parse(signedEventString)
+          const isVerifiedEvent = verifyEvent(signedEvent)
+
+          if (isVerifiedEvent) {
+            // get the actual signature of prev signer
+            const prevSignersSig = getPrevSignersSig(npub)
+
+            // get the signature of prev signer from the content of current signers signedEvent
+
+            try {
+              const obj: SignedEventContent = JSON.parse(signedEvent.content)
+              if (
+                obj.prevSig &&
+                prevSignersSig &&
+                obj.prevSig === prevSignersSig
+              ) {
+                isValidSignature = true
+              }
+            } catch (error) {
+              isValidSignature = false
+            }
+          }
+        } catch (error) {
+          console.error(
+            `An error occurred in parsing and verifying the signature event for ${pubkey}`,
+            error
+          )
+        }
+      }
+    }
+
+    return (
+      <>
+        <UserAvatar
+          pubkey={pubkey}
+          name={
+            profile?.display_name || profile?.name || shorten(hexToNpub(pubkey))
+          }
+          image={profile?.picture}
+        />
+
+        {verifySignature && (
+          <>
+            {isValidSignature && (
+              <Tooltip title="Valid signature">
+                <CheckCircle sx={{ color: 'green' }} />
+              </Tooltip>
+            )}
+
+            {!isValidSignature && (
+              <Tooltip title="Invalid signature">
+                <Cancel sx={{ color: 'red' }} />
+              </Tooltip>
+            )}
+          </>
+        )}
+      </>
+    )
+  }
+
+  return submittedBy ? (
+    <div className={styles.container}>
+      <div className={styles.section}>
+        <p>Signers</p>
+        {displayUser(submittedBy)}
+        {submittedBy && signers.length ? (
+          <Divider orientation="vertical" flexItem />
+        ) : null}
+        <UserAvatarGroup max={7}>
+          {signers.length > 0 &&
+            signers.map((signer) => (
+              <span key={signer}>{displayUser(npubToHex(signer)!, true)}</span>
+            ))}
+          {viewers.length > 0 &&
+            viewers.map((viewer) => (
+              <span key={viewer}>{displayUser(npubToHex(viewer)!)}</span>
+            ))}
+        </UserAvatarGroup>
+      </div>
+      <div className={styles.section}>
+        <p>Details</p>
+
+        <Tooltip
+          title={'Publication date'}
+          placement="top"
+          arrow
+          disableInteractive
+        >
+          <span className={styles.detailsItem}>
+            <FontAwesomeIcon icon={faCalendarPlus} />{' '}
+            {createdAt ? formatTimestamp(createdAt) : <>&mdash;</>}
+          </span>
+        </Tooltip>
+
+        <Tooltip
+          title={'Completion date'}
+          placement="top"
+          arrow
+          disableInteractive
+        >
+          <span className={styles.detailsItem}>
+            <FontAwesomeIcon icon={faCalendarCheck} />{' '}
+            {completedAt ? formatTimestamp(completedAt) : <>&mdash;</>}
+          </span>
+        </Tooltip>
+
+        {/* User signed date */}
+        {userCanSign ? (
+          <Tooltip
+            title={'Your signature date'}
+            placement="top"
+            arrow
+            disableInteractive
+          >
+            <span className={styles.detailsItem}>
+              <FontAwesomeIcon icon={faCalendar} />{' '}
+              {hexToNpub(usersPubkey) in parsedSignatureEvents ? (
+                parsedSignatureEvents[hexToNpub(usersPubkey)].created_at ? (
+                  formatTimestamp(
+                    fromUnixTimestamp(
+                      parsedSignatureEvents[hexToNpub(usersPubkey)].created_at
+                    )
+                  )
+                ) : (
+                  <>&mdash;</>
+                )
+              ) : (
+                <>&mdash;</>
+              )}
+            </span>
+          </Tooltip>
+        ) : null}
+        <span className={styles.detailsItem}>
+          <FontAwesomeIcon icon={faEye} /> {signedStatus}
+        </span>
+        {ext.length > 0 ? (
+          <span className={styles.detailsItem}>
+            {ext.length > 1 ? (
+              <>
+                <FontAwesomeIcon icon={faFile} /> Multiple File Types
+              </>
+            ) : (
+              getExtensionIconLabel(ext[0])
+            )}
+          </span>
+        ) : (
+          <>
+            <FontAwesomeIcon icon={faFileCircleExclamation} /> &mdash;
+          </>
+        )}
+      </div>
+    </div>
+  ) : undefined
+}

src/components/FilesUsers.tsx/style.module.scss

@@ -0,0 +1,41 @@
+@import '../../styles/colors.scss';
+
+.container {
+  border-radius: 4px;
+  background: $overlay-background-color;
+  padding: 15px;
+  display: flex;
+  flex-direction: column;
+  grid-gap: 25px;
+
+  font-size: 14px;
+}
+
+.section {
+  display: flex;
+  flex-direction: column;
+  grid-gap: 10px;
+}
+
+.detailsItem {
+  transition: ease 0.2s;
+  color: rgba(0, 0, 0, 0.5);
+  font-size: 14px;
+  align-items: center;
+  border-radius: 4px;
+  padding: 5px;
+
+  display: flex;
+  align-items: center;
+  justify-content: start;
+
+  > :first-child {
+    padding: 5px;
+    margin-right: 10px;
+  }
+
+  &:hover {
+    background: $primary-main;
+    color: white;
+  }
+}

src/components/UserAvatarGroup/index.tsx

@@ -28,7 +28,7 @@ export const UserAvatarGroup = ({
 
   const childrenArray = Children.toArray(children)
   return (
-    <div {...rest}>
+    <div className={styles.container} {...rest}>
       {surplus > 1
         ? childrenArray.slice(0, surplus * -1).map((c) => c)
         : children}

src/components/UserAvatarGroup/style.module.scss

@@ -1,5 +1,25 @@
 @import '../../styles/colors.scss';
 
+.container {
+  padding: 0 0 0 10px;
+
+  > * {
+    transition: margin ease 0.2s;
+    margin: 0 0 0 -10px;
+    position: relative;
+    z-index: 1;
+    &:first-child {
+      margin-left: -10px !important;
+    }
+  }
+
+  > *:hover,
+  > *:focus-within {
+    margin: 0 15px 0 5px;
+    z-index: 2;
+  }
+}
+
 .icon {
   width: 40px;
   height: 40px;

src/hooks/useSigitMeta.tsx

@@ -3,7 +3,8 @@ import { CreateSignatureEventContent, Meta } from '../types'
 import { Mark } from '../types/mark'
 import {
   fromUnixTimestamp,
-  parseCreateSignatureEvent,
+  hexToNpub,
+  parseNostrEvent,
   parseCreateSignatureEventContent,
   SigitMetaParseError,
   SigitStatus,
@@ -12,11 +13,36 @@ import {
 import { toast } from 'react-toastify'
 import { verifyEvent } from 'nostr-tools'
 import { Event } from 'nostr-tools'
+import store from '../store/store'
+import { AuthState } from '../store/auth/types'
+import { NostrController } from '../controllers'
+
+/**
+ * Flattened interface that combines properties `Meta`, `CreateSignatureEventContent`,
+ * and `Event` (event's fields are made optional and pubkey and created_at replaced with our versions)
+ */
+export interface FlatMeta
+  extends Meta,
+    CreateSignatureEventContent,
+    Partial<Omit<Event, 'pubkey' | 'created_at'>> {
+  // Remove pubkey and use submittedBy as `npub1${string}`
+  submittedBy?: `npub1${string}`
+
+  // Remove created_at and replace with createdAt
+  createdAt?: number
 
-interface FlatMeta extends Meta, CreateSignatureEventContent, Partial<Event> {
   // Validated create signature event
   isValid: boolean
 
+  // Decryption
+  encryptionKey: string | null
+
+  // Parsed Document Signatures
+  parsedSignatureEvents: { [signer: `npub1${string}`]: Event }
+
+  // Calculated completion time
+  completedAt?: number
+
   // Calculated status fields
   signedStatus: SigitStatus
   signersStatus: {
@@ -33,8 +59,8 @@ export const useSigitMeta = (meta: Meta): FlatMeta => {
   const [isValid, setIsValid] = useState(false)
   const [kind, setKind] = useState<number>()
   const [tags, setTags] = useState<string[][]>()
-  const [created_at, setCreatedAt] = useState<number>()
-  const [pubkey, setPubkey] = useState<string>() // submittedBy, pubkey from nostr event
+  const [createdAt, setCreatedAt] = useState<number>()
+  const [submittedBy, setSubmittedBy] = useState<`npub1${string}`>() // submittedBy, pubkey from nostr event
   const [id, setId] = useState<string>()
   const [sig, setSig] = useState<string>()
 
@@ -47,6 +73,12 @@ export const useSigitMeta = (meta: Meta): FlatMeta => {
   const [title, setTitle] = useState<string>('')
   const [zipUrl, setZipUrl] = useState<string>('')
 
+  const [parsedSignatureEvents, setParsedSignatureEvents] = useState<{
+    [signer: `npub1${string}`]: Event
+  }>({})
+
+  const [completedAt, setCompletedAt] = useState<number>()
+
   const [signedStatus, setSignedStatus] = useState<SigitStatus>(
     SigitStatus.Partial
   )
@@ -54,13 +86,13 @@ export const useSigitMeta = (meta: Meta): FlatMeta => {
     [signer: `npub1${string}`]: SignStatus
   }>({})
 
+  const [encryptionKey, setEncryptionKey] = useState<string | null>(null)
+
   useEffect(() => {
     if (!meta) return
     ;(async function () {
       try {
-        const createSignatureEvent = await parseCreateSignatureEvent(
-          meta.createSignature
-        )
+        const createSignatureEvent = await parseNostrEvent(meta.createSignature)
 
         const { kind, tags, created_at, pubkey, id, sig, content } =
           createSignatureEvent
@@ -70,7 +102,7 @@ export const useSigitMeta = (meta: Meta): FlatMeta => {
         setTags(tags)
         // created_at in nostr events are stored in seconds
         setCreatedAt(fromUnixTimestamp(created_at))
-        setPubkey(pubkey)
+        setSubmittedBy(pubkey as `npub1${string}`)
         setId(id)
         setSig(sig)
 
@@ -84,13 +116,47 @@ export const useSigitMeta = (meta: Meta): FlatMeta => {
         setMarkConfig(markConfig)
         setZipUrl(zipUrl)
 
-        // Parse each signature event and set signer status
+        if (meta.keys) {
+          const { sender, keys } = meta.keys
+
+          // Retrieve the user's public key from the state
+          const usersPubkey = (store.getState().auth as AuthState).usersPubkey!
+          const usersNpub = hexToNpub(usersPubkey)
+
+          // Check if the user's public key is in the keys object
+          if (usersNpub in keys) {
+            // Instantiate the NostrController to decrypt the encryption key
+            const nostrController = NostrController.getInstance()
+            const decrypted = await nostrController
+              .nip04Decrypt(sender, keys[usersNpub])
+              .catch((err) => {
+                console.log(
+                  'An error occurred in decrypting encryption key',
+                  err
+                )
+                return null
+              })
+
+            setEncryptionKey(decrypted)
+          }
+        }
+
+        // Temp. map to hold events
+        const parsedSignatureEventsMap = new Map<`npub1${string}`, Event>()
         for (const npub in meta.docSignatures) {
           try {
-            const event = await parseCreateSignatureEvent(
+            // Parse each signature event
+            const event = await parseNostrEvent(
               meta.docSignatures[npub as `npub1${string}`]
             )
+
             const isValidSignature = verifyEvent(event)
+
+            // Save events to a map, to save all at once outside loop
+            // We need the object to find completedAt
+            // Avoided using parsedSignatureEvents due to useEffect deps
+            parsedSignatureEventsMap.set(npub as `npub1${string}`, event)
+
             setSignersStatus((prev) => {
               return {
                 ...prev,
@@ -108,6 +174,11 @@ export const useSigitMeta = (meta: Meta): FlatMeta => {
             })
           }
         }
+
+        setParsedSignatureEvents(
+          Object.fromEntries(parsedSignatureEventsMap.entries())
+        )
+
         const signedBy = Object.keys(meta.docSignatures) as `npub1${string}`[]
         const isCompletelySigned = signers.every((signer) =>
           signedBy.includes(signer)
@@ -115,6 +186,20 @@ export const useSigitMeta = (meta: Meta): FlatMeta => {
         setSignedStatus(
           isCompletelySigned ? SigitStatus.Complete : SigitStatus.Partial
         )
+
+        // Check if all signers signed and are valid
+        if (isCompletelySigned) {
+          setCompletedAt(
+            fromUnixTimestamp(
+              signedBy.reduce((p, c) => {
+                return Math.max(
+                  p,
+                  parsedSignatureEventsMap.get(c)?.created_at || 0
+                )
+              }, 0)
+            )
+          )
+        }
       } catch (error) {
         if (error instanceof SigitMetaParseError) {
           toast.error(error.message)
@@ -125,15 +210,15 @@ export const useSigitMeta = (meta: Meta): FlatMeta => {
   }, [meta])
 
   return {
-    modifiedAt: meta.modifiedAt,
-    createSignature: meta.createSignature,
-    docSignatures: meta.docSignatures,
-    keys: meta.keys,
+    modifiedAt: meta?.modifiedAt,
+    createSignature: meta?.createSignature,
+    docSignatures: meta?.docSignatures,
+    keys: meta?.keys,
     isValid,
     kind,
     tags,
-    created_at,
-    pubkey,
+    createdAt,
+    submittedBy,
     id,
     sig,
     signers,
@@ -142,7 +227,10 @@ export const useSigitMeta = (meta: Meta): FlatMeta => {
     markConfig,
     title,
     zipUrl,
+    parsedSignatureEvents,
+    completedAt,
     signedStatus,
-    signersStatus
+    signersStatus,
+    encryptionKey
   }
 }

src/hooks/useSigitProfiles.tsx

@@ -0,0 +1,70 @@
+import { useEffect, useState } from 'react'
+import { ProfileMetadata } from '../types'
+import { MetadataController } from '../controllers'
+import { npubToHex } from '../utils'
+import { Event, kinds } from 'nostr-tools'
+
+/**
+ * Extracts profiles from metadata events
+ * @param pubkeys Array of npubs to check
+ * @returns ProfileMetadata
+ */
+export const useSigitProfiles = (
+  pubkeys: `npub1${string}`[]
+): { [key: string]: ProfileMetadata } => {
+  const [profileMetadata, setProfileMetadata] = useState<{
+    [key: string]: ProfileMetadata
+  }>({})
+
+  useEffect(() => {
+    if (pubkeys.length) {
+      const metadataController = new MetadataController()
+
+      // Remove duplicate keys
+      const users = new Set<string>([...pubkeys])
+
+      const handleMetadataEvent = (key: string) => (event: Event) => {
+        const metadataContent =
+          metadataController.extractProfileMetadataContent(event)
+
+        if (metadataContent) {
+          setProfileMetadata((prev) => ({
+            ...prev,
+            [key]: metadataContent
+          }))
+        }
+      }
+
+      users.forEach((user) => {
+        const hexKey = npubToHex(user)
+        if (hexKey && !(hexKey in profileMetadata)) {
+          metadataController.on(hexKey, (kind: number, event: Event) => {
+            if (kind === kinds.Metadata) {
+              handleMetadataEvent(hexKey)(event)
+            }
+          })
+
+          metadataController
+            .findMetadata(hexKey)
+            .then((metadataEvent) => {
+              if (metadataEvent) handleMetadataEvent(hexKey)(metadataEvent)
+            })
+            .catch((err) => {
+              console.error(
+                `error occurred in finding metadata for: ${user}`,
+                err
+              )
+            })
+        }
+      })
+
+      return () => {
+        users.forEach((key) => {
+          metadataController.off(key, handleMetadataEvent(key))
+        })
+      }
+    }
+  }, [pubkeys, profileMetadata])
+
+  return profileMetadata
+}

src/layouts/StickySideColumns.module.scss

@@ -0,0 +1,29 @@
+@import '../styles/colors.scss';
+@import '../styles/sizes.scss';
+
+.container {
+  display: grid;
+  grid-template-columns: 0.75fr 1.5fr 0.75fr;
+  grid-gap: 30px;
+  flex-grow: 1;
+}
+
+.sidesWrap {
+  position: relative;
+}
+
+.sides {
+  position: sticky;
+  top: $header-height + $body-vertical-padding;
+}
+
+.files {
+  display: flex;
+  flex-direction: column;
+  grid-gap: 15px;
+}
+.content {
+  max-width: 550px;
+  width: 100%;
+  margin: 0 auto;
+}

src/layouts/StickySideColumns.tsx

@@ -0,0 +1,26 @@
+import { PropsWithChildren, ReactNode } from 'react'
+
+import styles from './StickySideColumns.module.scss'
+
+interface StickySideColumnsProps {
+  left?: ReactNode
+  right?: ReactNode
+}
+
+export const StickySideColumns = ({
+  left,
+  right,
+  children
+}: PropsWithChildren<StickySideColumnsProps>) => {
+  return (
+    <div className={styles.container}>
+      <div className={`${styles.sidesWrap} ${styles.files}`}>
+        <div className={styles.sides}>{left}</div>
+      </div>
+      <div className={styles.content}>{children}</div>
+      <div className={styles.sidesWrap}>
+        <div className={styles.sides}>{right}</div>
+      </div>
+    </div>
+  )
+}

src/pages/verify/index.tsx

@@ -1,38 +1,20 @@
-import {
-  Box,
-  Button,
-  List,
-  ListItem,
-  ListSubheader,
-  Tooltip,
-  Typography,
-  useTheme
-} from '@mui/material'
+import { Box, Button, Tooltip, Typography, useTheme } from '@mui/material'
 import JSZip from 'jszip'
 import { MuiFileInput } from 'mui-file-input'
-import { Event, kinds, verifyEvent } from 'nostr-tools'
+import { Event, verifyEvent } from 'nostr-tools'
 import { useEffect, useState } from 'react'
 import { toast } from 'react-toastify'
 import { LoadingSpinner } from '../../components/LoadingSpinner'
-import { UserAvatar } from '../../components/UserAvatar'
-import { MetadataController, NostrController } from '../../controllers'
-import {
-  CreateSignatureEventContent,
-  Meta,
-  ProfileMetadata,
-  SignedEventContent
-} from '../../types'
+import { NostrController } from '../../controllers'
+import { CreateSignatureEventContent, Meta } from '../../types'
 import {
   decryptArrayBuffer,
   extractMarksFromSignedMeta,
-  extractZipUrlAndEncryptionKey,
   getHash,
   hexToNpub,
   unixNow,
-  npubToHex,
   parseJson,
   readContentOfZipEntry,
-  shorten,
   signEventForMetaFile
 } from '../../utils'
 import styles from './style.module.scss'
@@ -51,6 +33,9 @@ import { useSelector } from 'react-redux'
 import { getLastSignersSig } from '../../utils/sign.ts'
 import { saveAs } from 'file-saver'
 import { Container } from '../../components/Container'
+import { useSigitMeta } from '../../hooks/useSigitMeta.tsx'
+import { Files } from '../../layouts/Files.tsx'
+import { FileUsers } from '../../components/FilesUsers.tsx/index.tsx'
 
 export const VerifyPage = () => {
   const theme = useTheme()
@@ -63,52 +48,30 @@ export const VerifyPage = () => {
    * uploadedZip will be received from home page when a user uploads a sigit zip wrapper that contains meta.json
    * meta will be received in navigation from create & home page in online mode
    */
-  const { uploadedZip, meta: metaInNavState } = location.state || {}
+  const { uploadedZip, meta } = location.state || {}
+
+  const { submittedBy, zipUrl, encryptionKey, signers, viewers, fileHashes } =
+    useSigitMeta(meta)
 
   const [isLoading, setIsLoading] = useState(false)
   const [loadingSpinnerDesc, setLoadingSpinnerDesc] = useState('')
 
   const [selectedFile, setSelectedFile] = useState<File | null>(null)
-  const [meta, setMeta] = useState<Meta | null>(null)
 
-  const [submittedBy, setSubmittedBy] = useState<string>()
-
-  const [signers, setSigners] = useState<`npub1${string}`[]>([])
-  const [viewers, setViewers] = useState<`npub1${string}`[]>([])
-  const [creatorFileHashes, setCreatorFileHashes] = useState<{
-    [key: string]: string
-  }>({})
   const [currentFileHashes, setCurrentFileHashes] = useState<{
     [key: string]: string | null
-  }>({})
+  }>(fileHashes)
   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) {
       setSelectedFile(uploadedZip)
-    } else if (metaInNavState) {
+    } else if (meta && encryptionKey) {
       const processSigit = async () => {
         setIsLoading(true)
-        setLoadingSpinnerDesc('Extracting zipUrl and encryption key from meta')
-
-        const res = await extractZipUrlAndEncryptionKey(metaInNavState)
-        if (!res) {
-          setIsLoading(false)
-          return
-        }
-
-        const {
-          zipUrl,
-          encryptionKey,
-          createSignatureEvent,
-          createSignatureContent
-        } = res
 
         setLoadingSpinnerDesc('Fetching file from file server')
         axios
@@ -175,12 +138,6 @@ export const VerifyPage = () => {
               setCurrentFileHashes(fileHashes)
               setFiles(files)
 
-              setSigners(createSignatureContent.signers)
-              setViewers(createSignatureContent.viewers)
-              setCreatorFileHashes(createSignatureContent.fileHashes)
-              setSubmittedBy(createSignatureEvent.pubkey)
-
-              setMeta(metaInNavState)
               setIsLoading(false)
             }
           })
@@ -197,49 +154,7 @@ export const VerifyPage = () => {
 
       processSigit()
     }
-  }, [uploadedZip, metaInNavState])
-
-  useEffect(() => {
-    if (submittedBy) {
-      const metadataController = new MetadataController()
-
-      const users = [submittedBy, ...signers, ...viewers]
-
-      users.forEach((user) => {
-        const pubkey = npubToHex(user)!
-
-        if (!(pubkey in metadata)) {
-          const handleMetadataEvent = (event: Event) => {
-            const metadataContent =
-              metadataController.extractProfileMetadataContent(event)
-            if (metadataContent)
-              setMetadata((prev) => ({
-                ...prev,
-                [pubkey]: metadataContent
-              }))
-          }
-
-          metadataController.on(pubkey, (kind: number, event: Event) => {
-            if (kind === kinds.Metadata) {
-              handleMetadataEvent(event)
-            }
-          })
-
-          metadataController
-            .findMetadata(pubkey)
-            .then((metadataEvent) => {
-              if (metadataEvent) handleMetadataEvent(metadataEvent)
-            })
-            .catch((err) => {
-              console.error(
-                `error occurred in finding metadata for: ${user}`,
-                err
-              )
-            })
-        }
-      })
-    }
-  }, [submittedBy, signers, viewers, metadata])
+  }, [encryptionKey, meta, uploadedZip, zipUrl])
 
   const handleVerify = async () => {
     if (!selectedFile) return
@@ -345,44 +260,9 @@ export const VerifyPage = () => {
 
     if (!createSignatureContent) return
 
-    setSigners(createSignatureContent.signers)
-    setViewers(createSignatureContent.viewers)
-    setCreatorFileHashes(createSignatureContent.fileHashes)
-    setSubmittedBy(createSignatureEvent.pubkey)
-
-    setMeta(parsedMetaJson)
     setIsLoading(false)
   }
 
-  const getPrevSignersSig = (npub: string) => {
-    if (!meta) return null
-
-    // if user is first signer then use creator's signature
-    if (signers[0] === npub) {
-      try {
-        const createSignatureEvent: Event = JSON.parse(meta.createSignature)
-        return createSignatureEvent.sig
-      } catch (error) {
-        return null
-      }
-    }
-
-    // find the index of signer
-    const currentSignerIndex = signers.findIndex((signer) => signer === npub)
-    // return null if could not found user in signer's list
-    if (currentSignerIndex === -1) return null
-    // find prev signer
-    const prevSigner = signers[currentSignerIndex - 1]
-
-    // get the signature of prev signer
-    try {
-      const prevSignersEvent: Event = JSON.parse(meta.docSignatures[prevSigner])
-      return prevSignersEvent.sig
-    } catch (error) {
-      return null
-    }
-  }
-
   const handleExport = async () => {
     if (Object.entries(files).length === 0 || !meta || !usersPubkey) return
 
@@ -450,76 +330,6 @@ export const VerifyPage = () => {
     setIsLoading(false)
   }
 
-  const displayUser = (pubkey: string, verifySignature = false) => {
-    const profile = metadata[pubkey]
-
-    let isValidSignature = false
-
-    if (verifySignature) {
-      const npub = hexToNpub(pubkey)
-      const signedEventString = meta ? meta.docSignatures[npub] : null
-      if (signedEventString) {
-        try {
-          const signedEvent = JSON.parse(signedEventString)
-          const isVerifiedEvent = verifyEvent(signedEvent)
-
-          if (isVerifiedEvent) {
-            // get the actual signature of prev signer
-            const prevSignersSig = getPrevSignersSig(npub)
-
-            // get the signature of prev signer from the content of current signers signedEvent
-
-            try {
-              const obj: SignedEventContent = JSON.parse(signedEvent.content)
-              if (
-                obj.prevSig &&
-                prevSignersSig &&
-                obj.prevSig === prevSignersSig
-              ) {
-                isValidSignature = true
-              }
-            } catch (error) {
-              isValidSignature = false
-            }
-          }
-        } catch (error) {
-          console.error(
-            `An error occurred in parsing and verifying the signature event for ${pubkey}`,
-            error
-          )
-        }
-      }
-    }
-
-    return (
-      <>
-        <UserAvatar
-          pubkey={pubkey}
-          name={
-            profile?.display_name || profile?.name || shorten(hexToNpub(pubkey))
-          }
-          image={profile?.picture}
-        />
-
-        {verifySignature && (
-          <>
-            {isValidSignature && (
-              <Tooltip title="Valid signature">
-                <CheckCircle sx={{ color: theme.palette.success.light }} />
-              </Tooltip>
-            )}
-
-            {!isValidSignature && (
-              <Tooltip title="Invalid signature">
-                <Cancel sx={{ color: theme.palette.error.main }} />
-              </Tooltip>
-            )}
-          </>
-        )}
-      </>
-    )
-  }
-
   const displayExportedBy = () => {
     if (!meta || !meta.exportSignature) return null
 
@@ -529,7 +339,7 @@ export const VerifyPage = () => {
       const exportSignatureEvent = JSON.parse(exportSignatureString) as Event
 
       if (verifyEvent(exportSignatureEvent)) {
-        return displayUser(exportSignatureEvent.pubkey)
+        // return displayUser(exportSignatureEvent.pubkey)
       } else {
         toast.error(`Invalid export signature!`)
         return (
@@ -576,113 +386,13 @@ export const VerifyPage = () => {
         )}
 
         {meta && (
-          <>
-            <List
-              sx={{
-                bgcolor: 'background.paper',
-                marginTop: 2
-              }}
-              subheader={
-                <ListSubheader className={styles.subHeader}>
-                  Meta Info
-                </ListSubheader>
-              }
-            >
-              {submittedBy && (
-                <ListItem
-                  sx={{
-                    marginTop: 1,
-                    gap: '15px'
-                  }}
-                >
-                  <Typography variant="h6" sx={{ color: textColor }}>
-                    Submitted By
-                  </Typography>
-                  {displayUser(submittedBy)}
-                </ListItem>
-              )}
-
-              <ListItem
-                sx={{
-                  marginTop: 1,
-                  gap: '15px'
-                }}
-              >
-                <Typography variant="h6" sx={{ color: textColor }}>
-                  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 && (
-                <ListItem
-                  sx={{
-                    marginTop: 1,
-                    flexDirection: 'column',
-                    alignItems: 'flex-start'
-                  }}
-                >
-                  <Typography variant="h6" sx={{ color: textColor }}>
-                    Signers
-                  </Typography>
-                  <ul className={styles.usersList}>
-                    {signers.map((signer) => (
-                      <li
-                        key={signer}
-                        style={{
-                          color: textColor,
-                          display: 'flex',
-                          alignItems: 'center',
-                          gap: '15px'
-                        }}
-                      >
-                        {displayUser(npubToHex(signer)!, true)}
-                      </li>
-                    ))}
-                  </ul>
-                </ListItem>
-              )}
-
-              {viewers.length > 0 && (
-                <ListItem
-                  sx={{
-                    marginTop: 1,
-                    flexDirection: 'column',
-                    alignItems: 'flex-start'
-                  }}
-                >
-                  <Typography variant="h6" sx={{ color: textColor }}>
-                    Viewers
-                  </Typography>
-                  <ul className={styles.usersList}>
-                    {viewers.map((viewer) => (
-                      <li key={viewer} style={{ color: textColor }}>
-                        {displayUser(npubToHex(viewer)!)}
-                      </li>
-                    ))}
-                  </ul>
-                </ListItem>
-              )}
-
-              <ListItem
-                sx={{
-                  marginTop: 1,
-                  flexDirection: 'column',
-                  alignItems: 'flex-start'
-                }}
-              >
-                <Typography variant="h6" sx={{ color: textColor }}>
-                  Files
-                </Typography>
+          <Files
+            left={
+              <>
                 <Box className={styles.filesWrapper}>
                   {Object.entries(currentFileHashes).map(
                     ([filename, hash], index) => {
-                      const isValidHash = creatorFileHashes[filename] === hash
+                      const isValidHash = fileHashes[filename] === hash
 
                       return (
                         <Box key={`file-${index}`} className={styles.file}>
@@ -714,9 +424,17 @@ export const VerifyPage = () => {
                     }
                   )}
                 </Box>
-              </ListItem>
-            </List>
-          </>
+                {displayExportedBy()}
+                <Box sx={{ mt: 1, display: 'flex', justifyContent: 'center' }}>
+                  <Button onClick={handleExport} variant="contained">
+                    Export Sigit
+                  </Button>
+                </Box>
+              </>
+            }
+            right={<FileUsers meta={meta} />}
+            content={<div style={{ height: '300vh' }}></div>}
+          />
         )}
       </Container>
     </>

src/utils/meta.ts

@@ -62,38 +62,33 @@ function handleError(error: unknown): Error {
 
 // Reuse common error messages for meta parsing
 export enum SigitMetaParseErrorType {
-  'PARSE_ERROR_SIGNATURE_EVENT' = 'error occurred in parsing the create signature event',
+  'PARSE_ERROR_EVENT' = 'error occurred in parsing the create signature event',
   'PARSE_ERROR_SIGNATURE_EVENT_CONTENT' = "err in parsing the createSignature event's content"
 }
 
 export interface SigitCardDisplayInfo {
   createdAt?: number
   title?: string
-  submittedBy?: string
+  submittedBy?: `npub1${string}`
   signers: `npub1${string}`[]
   fileExtensions: string[]
   signedStatus: SigitStatus
 }
 
 /**
- * Wrapper for createSignatureEvent parse that throws custom SigitMetaParseError with cause and context
+ * Wrapper for event parser that throws custom SigitMetaParseError with cause and context
  * @param raw Raw string for parsing
  * @returns parsed Event
  */
-export const parseCreateSignatureEvent = async (
-  raw: string
-): Promise<Event> => {
+export const parseNostrEvent = async (raw: string): Promise<Event> => {
   try {
-    const createSignatureEvent = await parseJson<Event>(raw)
-    return createSignatureEvent
+    const event = await parseJson<Event>(raw)
+    return event
   } catch (error) {
-    throw new SigitMetaParseError(
-      SigitMetaParseErrorType.PARSE_ERROR_SIGNATURE_EVENT,
-      {
-        cause: handleError(error),
-        context: raw
-      }
-    )
+    throw new SigitMetaParseError(SigitMetaParseErrorType.PARSE_ERROR_EVENT, {
+      cause: handleError(error),
+      context: raw
+    })
   }
 }
 
@@ -135,9 +130,7 @@ export const extractSigitCardDisplayInfo = async (meta: Meta) => {
   }
 
   try {
-    const createSignatureEvent = await parseCreateSignatureEvent(
-      meta.createSignature
-    )
+    const createSignatureEvent = await parseNostrEvent(meta.createSignature)
 
     // created_at in nostr events are stored in seconds
     sigitInfo.createdAt = fromUnixTimestamp(createSignatureEvent.created_at)
@@ -147,13 +140,7 @@ export const extractSigitCardDisplayInfo = async (meta: Meta) => {
     )
 
     const files = Object.keys(createSignatureContent.fileHashes)
-    const extensions = files.reduce((result: string[], file: string) => {
-      const extension = file.split('.').pop()
-      if (extension) {
-        result.push(extension)
-      }
-      return result
-    }, [])
+    const extensions = extractFileExtensions(files)
 
     const signedBy = Object.keys(meta.docSignatures) as `npub1${string}`[]
     const isCompletelySigned = createSignatureContent.signers.every((signer) =>
@@ -161,7 +148,7 @@ export const extractSigitCardDisplayInfo = async (meta: Meta) => {
     )
 
     sigitInfo.title = createSignatureContent.title
-    sigitInfo.submittedBy = createSignatureEvent.pubkey
+    sigitInfo.submittedBy = createSignatureEvent.pubkey as `npub1${string}`
     sigitInfo.signers = createSignatureContent.signers
     sigitInfo.fileExtensions = extensions
 
@@ -179,3 +166,15 @@ export const extractSigitCardDisplayInfo = async (meta: Meta) => {
     }
   }
 }
+
+export const extractFileExtensions = (fileNames: string[]) => {
+  const extensions = fileNames.reduce((result: string[], file: string) => {
+    const extension = file.split('.').pop()
+    if (extension) {
+      result.push(extension)
+    }
+    return result
+  }, [])
+
+  return extensions
+}