fix PDF viewer downloads

#2369

Author: PalmerAL

js/preload/default.js

@@ -57,4 +57,8 @@ window.addEventListener('message', function (e) {
   if (e.data?.message === 'showUserscriptDirectory') {
     ipc.send('showUserscriptDirectory')
   }
+
+  if (e.data?.message === 'downloadFile') {
+    ipc.send('downloadFile', e.data.url)
+  }
 })

js/webviews.js

@@ -481,6 +481,12 @@ webviews.bindIPC('scroll-position-change', function (tabId, args) {
   })
 })
 
+webviews.bindIPC('downloadFile', function (tabId, args) {
+  if (tabs.get(tabId).url.startsWith('min://')) {
+    webviews.callAsync(tabId, 'downloadURL', [args[0]])
+  }
+})
+
 ipc.on('view-event', function (e, args) {
   webviews.emitEvent(args.event, args.tabId, args.args)
 })

pages/pdfViewer/viewer.js

@@ -509,22 +509,7 @@ function throttle (fn, threshhold, scope) {
 }
 
 function downloadPDF () {
-  function startDownload (title) {
-    var a = document.createElement('a')
-    a.download = title || ''
-    a.href = url
-    a.click()
-  }
-  if (pdf) {
-    pdf.getMetadata().then(function (data) {
-      startDownload(data.info.Title)
-    })
-  } else {
-    // there is no PDF data available
-    // this can happen if the download is happening because the file isn't a PDF and we can't show a preview
-    // or if the file hasn't loaded yet
-    startDownload('')
-  }
+  window.postMessage({ message: 'downloadFile', url })
 }
 
 /* printing */