changed extension stuff to Manifest v3; coded the file data extraction

.gitignore

@@ -1,2 +1,3 @@
 *.code-workspace
 tmp.md
+utils/

background.js

@@ -1,19 +1,33 @@
-console.log("background.js started!");
+console.log("background.js starts now");
 
 function handlePageactionClick(tab, onClickData) {
   console.log("background.js: executing content script");
-  let executing = browser.tabs.executeScript({file: "/contentscript.js"})
+  let executing = browser.scripting.executeScript({
+    files: [ "/contentscript.js" ],
+    target: {
+      tabId: tab.id,
+      allFrames: false
+    }
+  });
   executing.then(onExecuted, onExecutionError);
 }
 
 function onExecuted(result) {
-  console.log(`background.js: content script execution successful with result: ${result}`);
+  console.log(`background.js: content script execution successful with result: ${JSON.stringify(result)}`);
 }
 
+
 function onExecutionError(error) {
   console.error(`background.js: The following error occured while executing a content script: ${error}`);
 }
 
+
+let gettingAllPermissions = browser.permissions.getAll();
+gettingAllPermissions.then((allPermissions) => { 
+  console.log(JSON.stringify(allPermissions))
+});
+
+
+
 // add listener for the extension button
 browser.pageAction.onClicked.addListener(handlePageactionClick);
-

contentscript.js

@@ -9,34 +9,63 @@ function getCurrentDate() {
 }
 
 function extractFileUrlsAndNames() {
-  return [];
+console.log("contentscript.js: this is extractFileUrlsAndNames()");
+  // get the correct frame
+  let frame = document.querySelector("iframe.js-mail-content");
+  
+  // get all divs containing attachments
+  let divs = frame.contentWindow.document.body.querySelectorAll("div.samoware-mail-message__attach__item[attachment-ref]"); 
+  console.log(`contentscript.js: found ${divs.length} div containing attachments`);
+  
+  let urlsAndFilenames = []
+
+  // loop over divs and extract attachment information
+  divs.forEach(div => {
+    let url = div.getAttribute("attachment-ref");
+    let filename = div.getAttribute("file-name");
+
+    // if filename is null, derive it from url 
+    if ( ! filename ) {
+      let splitUrl = url.split("/");
+      filename = splitUrl[splitUrl.length-1];
+    }
+    urlsAndFilenames.push({url: url, filename: filename});
+  })
+
+  //console.log(`contentscript.js: urlsAndFilenames is ${JSON.stringify(urlsAndFilenames)}`);
+  return urlsAndFilenames;
 }
 
 function onStartedDownload(id) {
-  console.log(`Started downloading: ${id}`);
+  console.log(`contentscript.js: Started downloading: ${id}`);
 }
 
 function onFailedToStartDownload(error) {
-  console.log(`Download failed: ${error}`);
+  console.log(`contentscript.js: Download failed: ${error}`);
 }
 
-
+// get today's date
 let currentDate = getCurrentDate();
 console.log(`contentscript.js: currentDate is ${currentDate}`);
 
-let files = extractFileUrlsAndNames();
-console.log(`contentscript.js: files is ${files}`);
+let urlsAndFilenames = extractFileUrlsAndNames();
 
-for (let i = 0; i < files.length; i++) {
-  // prefix files[i].filename with currentDate
-  let prefixedFilename = currentDate + " " + files[i].filename;
+// loop over attachments
+for (let i = 0; i < urlsAndFilenames.length; i++) {
+  // prefix filename
+  let prefixedFilename = currentDate + " - " + urlsAndFilenames[i].filename;
+console.log(`contentscript.js: prefixedFilename is ${prefixedFilename}`);
 
+  // start download
   let downloading = browser.downloads.download({
-    url: files[i].url,
+    url: urlsAndFilenames[i].url,
     filename: prefixedFilename,
-    saveAs: (i == 0)   // raise a path chooser dialog for the first file only; all later files will (hopefully!) be saved to the same folder
+    saveAs: i == 0   // raise a path chooser dialog for the first file only; all later files will (hopefully!) be saved to the same folder
   });
+  console.log(`contentscript.js: downloading is ${downloading}`);
+  // resolve Promise
   downloading.then(onStartedDownload, onFailedToStartDownload);
 } 
 
-"contentscript.js has finished";
+console.log("contentscript.js: has finished");
+"contentscript.js: this is the final line";