Revert "signal-desktop: Add a Python wrapper to re-encrypt DBs"

This reverts commit 45bd7b39a4.

It's been three months now since the introduction of this hack so we can
finally drop it. All active users should have a re-encrypted DB by now
since Signal-Desktop builds expire after three months.

pkgs/applications/networking/instant-messengers/signal-desktop/db-reencryption-wrapper.py

@@ -1,92 +0,0 @@
-#!@PYTHON@
-
-import json
-import os
-import re
-import shlex
-import sqlite3
-import subprocess
-import sys
-
-
-DB_PATH = os.path.join(os.environ['HOME'], '.config/Signal/sql/db.sqlite')
-DB_COPY = os.path.join(os.environ['HOME'], '.config/Signal/sql/db.tmp')
-CONFIG_PATH = os.path.join(os.environ['HOME'], '.config/Signal/config.json')
-
-
-def zenity_askyesno(title, text):
-    args = [
-        '@ZENITY@',
-        '--question',
-        '--title',
-        shlex.quote(title),
-        '--text',
-        shlex.quote(text)
-    ]
-    return subprocess.run(args).returncode == 0
-
-
-def start_signal():
-    os.execvp('@SIGNAL-DESKTOP@', ['@SIGNAL-DESKTOP@'] + sys.argv[1:])
-
-
-def copy_pragma(name):
-    result = subprocess.run([
-        '@SQLCIPHER@',
-        DB_PATH,
-        f"PRAGMA {name};"
-    ], check=True, capture_output=True).stdout
-    result = re.search(r'[0-9]+', result.decode()).group(0)
-    subprocess.run([
-        '@SQLCIPHER@',
-        DB_COPY,
-        f"PRAGMA key = \"x'{key}'\"; PRAGMA {name} = {result};"
-    ], check=True, capture_output=True)
-
-
-try:
-    # Test if DB is encrypted:
-    con = sqlite3.connect(f'file:{DB_PATH}?mode=ro', uri=True)
-    cursor = con.cursor()
-    cursor.execute("SELECT name FROM sqlite_master WHERE type='table';")
-    con.close()
-except:
-    # DB is encrypted, everything ok:
-    start_signal()
-
-
-# DB is unencrypted!
-answer = zenity_askyesno(
-        "Error: Signal-Desktop database is not encrypted",
-        "Should we try to fix this automatically?"
-        + "You likely want to backup ~/.config/Signal/ first."
-)
-if not answer:
-    answer = zenity_askyesno(
-            "Launch Signal-Desktop",
-            "DB is unencrypted, should we still launch Signal-Desktop?"
-            + "Warning: This could result in data loss!"
-    )
-    if not answer:
-        print('Aborted')
-        sys.exit(0)
-    start_signal()
-
-# Re-encrypt the DB:
-with open(CONFIG_PATH) as json_file:
-    key = json.load(json_file)['key']
-result = subprocess.run([
-    '@SQLCIPHER@',
-    DB_PATH,
-    f" ATTACH DATABASE '{DB_COPY}' AS signal_db KEY \"x'{key}'\";"
-    + " SELECT sqlcipher_export('signal_db');"
-    + " DETACH DATABASE signal_db;"
-]).returncode
-if result != 0:
-    print('DB encryption failed')
-    sys.exit(1)
-# Need to copy user_version and schema_version manually:
-copy_pragma('user_version')
-copy_pragma('schema_version')
-os.rename(DB_COPY, DB_PATH)
-start_signal()

pkgs/applications/networking/instant-messengers/signal-desktop/default.nix

@@ -10,9 +10,6 @@
 , hunspellDicts, spellcheckerLanguage ? null # E.g. "de_DE"
 # For a full list of available languages:
 # $ cat pkgs/development/libraries/hunspell/dictionaries.nix | grep "dictFileName =" | awk '{ print $3 }'
-, python3
-, gnome
-, sqlcipher
 }:
 
 let
@@ -115,7 +112,7 @@ in stdenv.mkDerivation rec {
 
     # Symlink to bin
     mkdir -p $out/bin
-    ln -s $out/lib/Signal/signal-desktop $out/bin/signal-desktop-unwrapped
+    ln -s $out/lib/Signal/signal-desktop $out/bin/signal-desktop
 
     runHook postInstall
   '';
@@ -140,16 +137,6 @@ in stdenv.mkDerivation rec {
     patchelf --add-needed ${libpulseaudio}/lib/libpulse.so $out/lib/Signal/resources/app.asar.unpacked/node_modules/ringrtc/build/linux/libringrtc-x64.node
   '';
 
-  postFixup = ''
-    # This hack is temporarily required to avoid data-loss for users:
-    cp ${./db-reencryption-wrapper.py} $out/bin/signal-desktop
-    substituteInPlace $out/bin/signal-desktop \
-      --replace '@PYTHON@' '${python3}/bin/python3' \
-      --replace '@ZENITY@' '${gnome.zenity}/bin/zenity' \
-      --replace '@SQLCIPHER@' '${sqlcipher}/bin/sqlcipher' \
-      --replace '@SIGNAL-DESKTOP@' "$out/bin/signal-desktop-unwrapped"
-  '';
-
   # Tests if the application launches and waits for "Link your phone to Signal Desktop":
   passthru.tests.application-launch = nixosTests.signal-desktop;