fetchLangpacksFromFTP

fetchLangpacksFromFTP.patch

diff --git a/toolkit/mozapps/extensions/internal/AddonRepository.sys.mjs b/toolkit/mozapps/extensions/internal/AddonRepository.sys.mjs
index 8d4d178924eba..cceed36adf210 100644
--- a/toolkit/mozapps/extensions/internal/AddonRepository.sys.mjs
+++ b/toolkit/mozapps/extensions/internal/AddonRepository.sys.mjs
@@ -3,6 +3,7 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

 import { XPCOMUtils } from "resource://gre/modules/XPCOMUtils.sys.mjs";
+import { AppConstants } from "resource://gre/modules/AppConstants.sys.mjs";

 const lazy = {};

@@ -816,6 +817,15 @@ export var AddonRepository = {
   },

   async getAvailableLangpacks() {
+    let appVersion = Services.appinfo.version;
+    // If a local development build, try to fetch from FTP instead of AMO.
+    if (appVersion.endsWith("a1") && !AppConstants.MOZILLA_OFFICIAL) {
+      let ftpResult = await this._getAvailableLangpacksFromFTP();
+      if (ftpResult.length) {
+        return ftpResult;
+      }
+    }
+
     // This should be the API endpoint documented at:
     // http://addons-server.readthedocs.io/en/latest/topics/api/addons.html#language-tools
     let url = this._formatURLPref(PREF_GET_LANGPACKS);
@@ -852,6 +862,40 @@ export var AddonRepository = {

     return result;
   },
+
+  async _getAvailableLangpacksFromFTP() {
+    let result = [];
+    let dirURL = Services.prefs.getCharPref(
+      "extensions.getAddons.langpacks.nightly.url",
+      ""
+    );
+    if (!dirURL) {
+      return result;
+    }
+    try {
+      let response = await fetch(dirURL, { credentials: "omit" });
+      // FTP returns an HTML directory listing, so we need to parse it.
+      let text = await response.text();
+      let parser = new DOMParser();
+      let doc = parser.parseFromString(text, "text/html");
+      let links = [...doc.querySelectorAll("a")];
+      let regex = /^firefox-(\d+\.\d+(?:a\d)?)\.(\w+(?:-\w+)?)\.langpack\.xpi$/;
+      for (let link of links) {
+        let match = link.textContent.match(regex);
+        if (!match) {
+          continue;
+        }
+        let [, version, target_locale] = match;
+        if (Services.vc.compare(version, Services.appinfo.version) < 1) {
+          let url = new URL(link.href, dirURL).href;
+          result.push({ target_locale, url });
+        }
+      }
+    } catch (e) {
+      logger.debug("Error fetching langpacks from FTP: " + e);
+    }
+    return result;
+  },
 };

 var AddonDatabase = {