fix(download): scan link detection

Fix #164

src/pages/mod/index.tsx

@@ -29,7 +29,9 @@ import {
   checkUrlForFile,
   copyTextToClipboard,
   downloadFile,
-  getFilenameFromUrl
+  getFilenameFromUrl,
+  isReachable,
+  isValidUrl
 } from '../../utils'
 import { Comments } from '../../components/comment'
 import { PublishDetails } from 'components/Internal/PublishDetails'
@@ -615,11 +617,25 @@ const Download = ({
 }: DownloadUrl) => {
   const [showAuthDetails, setShowAuthDetails] = useState(false)
   const [showNotice, setShowNotice] = useState(false)
-  const showScanNotice = !malwareScanLink
+  const [showScanNotice, setShowCanNotice] = useState(false)
 
   useDidMount(async () => {
     const isFile = await checkUrlForFile(url)
     setShowNotice(!isFile)
+
+    // Check the malware scan url
+    // if it's valid URL
+    // if it's reachable
+    // if it contains sha256
+    const regex = /\b[a-fA-F0-9]{64}\b/
+    setShowCanNotice(
+      !(
+        malwareScanLink &&
+        isValidUrl(malwareScanLink) &&
+        (await isReachable(malwareScanLink)) &&
+        regex.test(url)
+      )
+    )
   })
 
   const handleDownload = () => {