Fix Chrome save-as prompt and unreliable finish notifications

Chrome's own "Ask where to save each file" setting shows a native
picker before the extension can ever intercept the download, and no
extension API can read or suppress it -- surface this clearly in
install.sh, the README, and a popup shortcut instead of leaving it
buried as a footnote.

Also fixes silently missing "download complete" notifications: KGet
only fires its own finished-notification if a transfer was observed
in a non-finished state at least once, so small/fast downloads that
complete before that first observation never get one. The native
host now drives its own notification via notify-send, polling actual
transfer progress instead of relying on KGet's internal check, and
install.sh disables KGet's own notification to avoid duplicates.

README.md

@@ -11,8 +11,11 @@ addition to) the browser's built-in downloader.
   starts is cancelled and handed off to KGet the same way, automatically,
   with the correct filename (resolved by Chrome itself, so it's right even
   for URLs whose path is just an opaque ID). Defaults to ON.
-- KGet's own "Download Finished" desktop notification is enabled on install,
+- A "Download complete" desktop notification appears once a capture actually
-  so you still get feedback once a capture completes.
+  finishes downloading. This is driven by the extension itself (not KGet's
+  own per-transfer notification, which KGet silently skips for downloads
+  that finish very quickly — see Troubleshooting), so it fires reliably
+  regardless of file size or speed.
 
 ## Requirements
 
@@ -20,8 +23,12 @@ addition to) the browser's built-in downloader.
 - One of: Google Chrome, Chromium, Brave, Vivaldi, Microsoft Edge
 - `python3` and `dbus-send` on `PATH` (standard on virtually all Linux/KDE
   systems already)
-- `kwriteconfig6` (ships with KDE Plasma) — optional, only used to enable the
+- `notify-send` (ships with most Linux desktops via libnotify) — optional,
-  download-finished notification; install still works without it
+  only used for the download-complete notification; captures still work
+  without it, just silently
+- `kwriteconfig6` (ships with KDE Plasma) — optional, only used to disable
+  KGet's own unreliable per-transfer notification so it doesn't double up
+  with the extension's; install still works without it
 
 ## Install
 
@@ -38,6 +45,12 @@ finds installed, then prints the extension's fixed ID and next steps:
 2. Enable **Developer mode** (top-right toggle).
 3. Click **Load unpacked** and select this repo's `extension/` directory.
 4. Confirm the loaded extension's ID matches the one `install.sh` printed.
+5. Open `chrome://settings/downloads` (or your browser's equivalent, e.g.
+   `brave://settings/downloads`, `edge://settings/downloads`) and turn **off**
+   "Ask where to save each file before downloading". Chrome shows this dialog
+   itself, before the extension ever gets a chance to intercept the download —
+   no extension API can read or suppress it, so this one-time setting change
+   is required for captures to work without an extra prompt.
 
 ## Usage
 
@@ -89,12 +102,8 @@ git push origin v1.0.0
   the URL path, which is wrong for opaque/signed URLs (e.g. cloud storage
   links). Fixing this would require broad host permissions and an extra HTTP
   request per right-click, which isn't worth it for now.
-- **Chrome may still show its own "Save As" dialog.** This is controlled by
+- **Chrome may still show its own "Save As" dialog** if you skipped step 5 of
-  Chrome's own **Ask where to save each file before downloading** setting
+  Install above — see there for why and how to fix it.
-  (`chrome://settings/downloads`) — no extension API can read or suppress
-  it, and if it's on, Chrome shows the picker *before* our extension gets a
-  chance to see the download at all. Turn that setting off for auto-capture
-  to work without an extra prompt.
 - **KGet must already be running.** If it's not, captures fail silently from
   the user's perspective — check the service worker console for the actual
   error (see Troubleshooting).
@@ -113,11 +122,19 @@ git push origin v1.0.0
     org.kde.kget.main.addTransfer string:"https://example.com/file.zip" string:"$HOME/Downloads/file.zip" boolean:true
   ```
   If this fails with `ServiceUnknown`, KGet isn't running.
-- **Download-finished notification not showing?** `install.sh` enables it via
+- **Download-complete notification not showing?** Confirm `notify-send` is
-  `kwriteconfig6 --file knotifyrc --group "Event/kget/finished" --key Action Popup`.
+  installed (`command -v notify-send`) — without it, `kget_capture_host.py`
-  Check System Settings → Notifications → Applications → "KGet Download
+  skips the notification entirely rather than erroring. Otherwise, check that
-  Manager" to confirm it's on, or disable it the same way with
+  the transfer actually reached 100%: `kget_capture_host.py` polls
-  `kwriteconfig6 --file knotifyrc --group "Event/kget/finished" --key Action None`.
+  `org.kde.kget.transfer.percent` on the new transfer's D-Bus object path
+  (e.g. `/KGet/Transfers/9`, printed by the `addTransfer` call above) until it
+  hits 100, so a stuck/erroring transfer never fires one. Note this
+  notification is separate from KGet's own built-in "Download Finished"
+  event — `install.sh` disables that one (`kwriteconfig6 --file knotifyrc
+  --group "Event/kget/finished" --key Action None`) because KGet only fires
+  it for transfers it observed in a non-finished state at least once, so it
+  silently skips small/fast downloads that complete before that first
+  observation.
 
 ## License
 

extension/manifest.json

@@ -1,7 +1,7 @@
 {
   "manifest_version": 3,
   "name": "KGet Capture",
-  "version": "1.0.1",
+  "version": "1.0.2",
   "description": "Send browser downloads to KGet (KDE Download Manager) on Linux.",
   "key": "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAtM1nFg5pPd3UBzynUJHj6aUy7bjudZaX9AQTWGMqAX3fXylw1lubSzP1/BaS9ivvgOJg/loyEgzEZlcNPzblFVlg8BqEJ3tntdk2OzYvUs0pUdcPzzyjso9TykCkUUTI7ev8JkreW/FYlinfvNwSYN4/c1s3h8/I6XHtxOdmO1G3bS98+BQaXPldbDmxoKwyWR8u1f8gTO2Mg3GY4BHau3RWf1kgtNzh20p9wE3sEFdWkFu7ArgRCIrWLh6m3O6lolnHQSCWPwtOTx893Qkp9Eu6FwUnoWc8rsYx8sqa0eNCTCS6Kjr1Iu3yEJ5y9390jUiDZTQ/c62ueCTQaYv2bwIDAQAB",
   "permissions": ["downloads", "contextMenus", "storage", "nativeMessaging"],

extension/popup.css

@@ -27,3 +27,12 @@ h1 {
   color: #777;
   line-height: 1.4;
 }
+
+.hint button {
+  display: block;
+  margin-top: 6px;
+  padding: 4px 8px;
+  font-size: 12px;
+  font-family: inherit;
+  cursor: pointer;
+}

extension/popup.html

@@ -13,6 +13,10 @@
   <p class="status" id="status-line"></p>
   <p class="hint">Right-click any link, image, video, or audio and choose
     "Download with KGet" to send it to KGet on demand.</p>
+  <p class="hint">Downloads still prompting for a location? Chrome shows that
+    dialog itself, before this extension can intercept anything.
+    <button id="open-download-settings" type="button">Turn off Chrome's download prompt</button>
+  </p>
   <script src="popup.js"></script>
 </body>
 </html>

extension/popup.js

@@ -14,3 +14,7 @@ checkbox.addEventListener("change", () => {
   chrome.storage.local.set({ autoCaptureEnabled: checkbox.checked });
   renderStatus(checkbox.checked);
 });
+
+document.getElementById("open-download-settings").addEventListener("click", () => {
+  chrome.tabs.create({ url: "chrome://settings/downloads" });
+});

install.sh

@@ -51,6 +51,24 @@ if [ "$registered_any" = false ]; then
   done
 fi
 
+declare -A BROWSER_SETTINGS_URLS=(
+  ["Google Chrome"]="chrome://settings/downloads"
+  ["Chromium"]="chrome://settings/downloads"
+  ["Brave"]="brave://settings/downloads"
+  ["Vivaldi"]="vivaldi://settings/downloads"
+  ["Microsoft Edge"]="edge://settings/downloads"
+)
+
+echo "Checking Chrome's \"Ask where to save each file\" setting..."
+prompt_warnings=()
+for browser in "${!BROWSER_DIRS[@]}"; do
+  config_dir="${BROWSER_DIRS[$browser]}"
+  prefs_file="$config_dir/Default/Preferences"
+  if [ -f "$prefs_file" ] && grep -q '"prompt_for_download":true' "$prefs_file" 2>/dev/null; then
+    prompt_warnings+=("  - $browser: open ${BROWSER_SETTINGS_URLS[$browser]} and turn off \"Ask where to save each file before downloading\"")
+  fi
+done
+
 echo "Checking KGet's default download folder..."
 python3 - <<'PYEOF'
 import configparser
@@ -90,15 +108,25 @@ else:
     print("(If KGet is currently running, restart it for this to take effect.)")
 PYEOF
 
-echo "Checking KGet's download-finished notification..."
+echo "Disabling KGet's own per-transfer notification..."
-KNOTIFYRC="$HOME/.config/knotifyrc"
+# KGet only fires this event if the transfer was still non-Finished the
-if [ -f "$KNOTIFYRC" ] && grep -q '^\[Event/kget/finished\]' "$KNOTIFYRC"; then
+# first time its UI observed it -- small/fast downloads routinely finish
-  echo "KGet's download-finished notification is already configured, leaving it as-is"
+# before that, so KGet silently skips it for them. kget_capture_host.py
-elif command -v kwriteconfig6 >/dev/null 2>&1; then
+# shows its own "Download complete" notification (via notify-send) for
-  kwriteconfig6 --file knotifyrc --group "Event/kget/finished" --key Action Popup
+# every capture instead, driven by polling actual transfer progress, so it
-  echo "Enabled a desktop popup notification for KGet's \"Download Finished\" event"
+# fires reliably regardless of download speed. Disable KGet's copy here to
+# avoid a duplicate popup on the transfers that are slow enough for it to
+# fire on its own.
+if command -v kwriteconfig6 >/dev/null 2>&1; then
+  kwriteconfig6 --file knotifyrc --group "Event/kget/finished" --key Action None
+  echo "Done -- KGet Capture's own notification will be used instead"
 else
-  echo "Skipped: 'kwriteconfig6' not found (not on KDE Plasma?) -- no popup notification set up"
+  echo "Skipped: 'kwriteconfig6' not found (not on KDE Plasma?) -- KGet's own notification, if any, is left as configured"
+fi
+
+echo "Checking for 'notify-send' (used for the download-complete notification)..."
+if ! command -v notify-send >/dev/null 2>&1; then
+  echo "WARNING: 'notify-send' not found -- captures will still work, but you won't get a notification when they finish"
 fi
 
 EXT_ID=$(cat "$SCRIPT_DIR/keys/extension-id.txt")
@@ -117,3 +145,15 @@ Next steps:
 
 Make sure KGet is running (or set to autostart) for captures to work.
 EOF
+
+if [ "${#prompt_warnings[@]}" -gt 0 ]; then
+  cat <<EOF
+
+WARNING: "Ask where to save each file before downloading" is ON for:
+$(printf '%s\n' "${prompt_warnings[@]}")
+
+Chrome shows that dialog itself, before the extension ever gets a chance to
+intercept the download -- no extension API can read or suppress it. Turn it
+off in each browser above or captures will keep prompting for a location.
+EOF
+fi

native-host/kget_capture_host.py

@@ -3,6 +3,8 @@
 
 import json
 import os
+import re
+import shutil
 import struct
 import subprocess
 import sys
@@ -62,14 +64,87 @@ def add_transfer(url, filename):
     try:
         result = subprocess.run(cmd, capture_output=True, text=True, timeout=15)
     except FileNotFoundError:
-        return False, "dbus-send not found on this system"
+        return False, "dbus-send not found on this system", None, dest
     except subprocess.TimeoutExpired:
-        return False, "dbus-send call timed out (is KGet running?)"
+        return False, "dbus-send call timed out (is KGet running?)", None, dest
 
     if result.returncode != 0:
         stderr = result.stderr.strip()
-        return False, f"dbus-send failed: {stderr or 'unknown error'}"
+        return False, f"dbus-send failed: {stderr or 'unknown error'}", None, dest
-    return True, None
+
+    # addTransfer replies with an array of the new transfer's D-Bus object
+    # path(s), e.g. `array [ string "/KGet/Transfers/9" ]` -- grab the first
+    # one so we can poll it for completion (see spawn_notifier).
+    match = re.search(r'string "(/KGet/Transfers/\d+)"', result.stdout)
+    transfer_path = match.group(1) if match else None
+    return True, None, transfer_path, dest
+
+
+# KGet only fires its own "Download Finished" desktop notification if the
+# transfer was still in a non-Finished state the first time KGet's UI
+# observed it (see GenericObserver::transfersChangedEvent in KGet's
+# core/kget.cpp: `status() == Finished && startStatus() != Finished`).
+# Small/fast downloads routinely finish before that first observation, so
+# KGet silently skips the notification for them -- confirmed by tracing
+# actual D-Bus traffic against a running KGet instance. We replace it with
+# our own, driven by polling the transfer's real progress, so captures
+# always get a completion notification regardless of how fast they finish.
+_NOTIFIER_SCRIPT = """
+import subprocess, sys, time
+
+path, dest = sys.argv[1], sys.argv[2]
+
+def get_percent():
+    try:
+        result = subprocess.run(
+            ["dbus-send", "--session", "--print-reply", "--dest=org.kde.kget",
+             path, "org.kde.kget.transfer.percent"],
+            capture_output=True, text=True, timeout=10,
+        )
+    except (subprocess.TimeoutExpired, FileNotFoundError):
+        return None
+    if result.returncode != 0:
+        return None
+    for line in result.stdout.splitlines():
+        line = line.strip()
+        if line.startswith("int32"):
+            return int(line.split()[-1])
+    return None
+
+deadline = time.time() + 6 * 3600
+finished = False
+while time.time() < deadline:
+    percent = get_percent()
+    if percent is None:
+        break  # transfer object is gone: finished+cleared, cancelled, or KGet restarted
+    if percent >= 100:
+        finished = True
+        break
+    time.sleep(2)
+
+if finished:
+    subprocess.run(
+        ["notify-send", "--app-name=KGet Capture", "--icon=kget",
+         "Download complete", dest.rsplit("/", 1)[-1]],
+        timeout=10,
+    )
+"""
+
+
+def spawn_notifier(transfer_path, dest):
+    if not transfer_path or not shutil.which("notify-send"):
+        return
+    # Detached (new session, no inherited pipes) so it keeps running after
+    # Chrome closes the native-messaging connection and kills this process --
+    # sendNativeMessage() tears down its native host as soon as it gets a
+    # reply, which is long before a real download finishes.
+    subprocess.Popen(
+        [sys.executable, "-c", _NOTIFIER_SCRIPT, transfer_path, dest],
+        stdin=subprocess.DEVNULL,
+        stdout=subprocess.DEVNULL,
+        stderr=subprocess.DEVNULL,
+        start_new_session=True,
+    )
 
 
 def main():
@@ -78,7 +153,9 @@ def main():
         write_message({"ok": False, "error": "invalid request"})
         return
 
-    ok, error = add_transfer(message["url"], message.get("filename"))
+    ok, error, transfer_path, dest = add_transfer(message["url"], message.get("filename"))
+    if ok:
+        spawn_notifier(transfer_path, dest)
     write_message({"ok": True} if ok else {"ok": False, "error": error})