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patcher.py
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patcher.py
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import argparse
import glob
import gzip
import os
import platform
import ctypes
import logging
import shutil
import subprocess
import time
from typing import Optional
import psutil
logging.basicConfig(level=logging.INFO)
ORIGINAL_SERVER_ADDRESSES = [
"https://raw.githubusercontent.com",
"https://github.com",
"https://releases.obsidian.md"
]
SIGNATURE_VERIFICATION_METHODS = [
"let verifiedHash =",
"let verifiedSignature =",
]
OBSIDIAN_PATHS = [
os.path.join(os.getenv("LOCALAPPDATA"), 'Obsidian', 'resources'),
os.path.join(os.getenv("LOCALAPPDATA"), 'Programs', 'Obsidian', 'resources'),
]
def validate_rasar_is_available():
try:
subprocess.check_call("rasar --version".split(), stdout=subprocess.DEVNULL)
except subprocess.CalledProcessError:
logging.fatal("[!] install rasar, https://github.com/Zerthox/rasar")
exit(-1)
def validate_running_as_admin():
if platform.system() == "Windows":
if not ctypes.windll.shell32.IsUserAnAdmin():
logging.fatal("[!] Run as admin!")
exit(-1)
elif os.getuid() != 0:
logging.fatal("[!] Run as admin!")
exit(-1)
def stop_running_obsidian():
logging.info("[*] Stopping obsidian")
for proc in psutil.process_iter():
if proc.name().lower().startswith("obsidian"):
proc.kill()
time.sleep(3)
def unpack_asar(asar_path: str, asar_backup_path: Optional[str], extracted_asar_path: str):
if asar_backup_path:
if os.path.exists(asar_backup_path):
logging.info("[*] Restoring original %s from backup", os.path.basename(asar_path))
shutil.copy(asar_backup_path, asar_path)
else:
logging.info("[*] Backing up original %s", os.path.basename(asar_path))
shutil.copy(asar_path, asar_backup_path)
logging.info("[*] Extracting %s", os.path.basename(asar_path))
subprocess.call(f"rasar e {asar_path} {extracted_asar_path}".split(
), stdout=subprocess.DEVNULL)
if not os.path.exists(os.path.join(extracted_asar_path, 'app.js')) and \
not os.path.exists(os.path.join(extracted_asar_path, 'main.js')):
logging.fatal("[*] Cannot find app.js/main.js in %s", extracted_asar_path)
exit(-1)
def patch_asar_folder(extracted_asar_path: str, offline_server: str):
for js_file in [
os.path.join(extracted_asar_path, 'app.js'),
os.path.join(extracted_asar_path, 'main.js')
]:
if os.path.exists(js_file):
logging.info("[*] Replacing server in %s", js_file)
with open(js_file, 'r', encoding='utf8') as file:
filedata = file.read()
for server in ORIGINAL_SERVER_ADDRESSES:
filedata = filedata.replace(server, offline_server)
# let verifiedHash = hashComparison -> let verifiedHash = true || hashComparison;
for signature_verification in SIGNATURE_VERIFICATION_METHODS:
filedata = filedata.replace(
signature_verification, f'{signature_verification} true || ')
with open(js_file, 'w', encoding='utf8') as file:
file.write(filedata)
def pack_asar(asar_path: str, extracted_asar_path: str):
logging.info("[*] Deleting old %s", os.path.basename(asar_path))
os.unlink(asar_path)
logging.info("[*] Packing new %s", os.path.basename(asar_path))
subprocess.call(f"rasar p {extracted_asar_path} {asar_path}".split(), stdout=subprocess.DEVNULL)
logging.info("[*] Deleting extracted %s", os.path.basename(asar_path))
shutil.rmtree(extracted_asar_path)
def patch_asar(asar_path: str, server_address: str, backup_asar: bool = False):
asar_backup_path = f'{asar_path}.bak' if backup_asar else None
extracted_asar_path = f'{asar_path}.extracted'
unpack_asar(asar_path, asar_backup_path, extracted_asar_path)
patch_asar_folder(extracted_asar_path, server_address)
pack_asar(asar_path, extracted_asar_path)
def patch_obsidian_releases(offline_server: str):
desktop_releases_path = os.path.join(os.path.dirname(
__file__), '../downloader/files/obsidianmd/obsidian-releases/desktop-releases.json')
logging.info("[*] Switching server in %s", desktop_releases_path)
with open(desktop_releases_path, 'r', encoding='utf8') as desktop_releases:
filedata = desktop_releases.read()
for server in ORIGINAL_SERVER_ADDRESSES:
filedata = filedata.replace(server, offline_server)
with open(desktop_releases_path, 'w', encoding='utf-8') as desktop_releases:
desktop_releases.write(filedata)
for gzipped_release_path in glob.iglob(
os.path.join(os.path.dirname(
__file__), '../downloader/files/obsidianmd/obsidian-releases/releases/download/*/*.gz'),
recursive=True
):
release_path = os.path.splitext(gzipped_release_path)[0]
with gzip.open(gzipped_release_path, 'rb') as gzipped_release:
with open(release_path, 'wb') as release:
shutil.copyfileobj(gzipped_release, release)
patch_asar(release_path, offline_server, False)
with open(release_path, 'rb') as release:
with gzip.open(gzipped_release_path, 'wb') as gzipped_release:
shutil.copyfileobj(release, gzipped_release)
os.unlink(release_path)
def delete_obsidian_cache():
for obsidian_asar_cache in glob.glob(os.path.join(os.getenv("APPDATA"), 'obsidian', '*.asar')):
logging.info('[*] Removing cached asar -> %s', obsidian_asar_cache)
os.remove(obsidian_asar_cache)
def main():
validate_rasar_is_available()
parser = argparse.ArgumentParser()
parser.add_argument("--server", help="Server address",
default="http://obsidian-server/files")
parser.add_argument("--patch_releases",
help="Patch every release file", action="store_true")
args = parser.parse_args()
logging.info('[*] Configured server: %s', args.server)
if args.patch_releases:
patch_obsidian_releases(args.server)
return
# Validating the environment.
validate_running_as_admin()
stop_running_obsidian()
# TODO: Obsidian path in linux.
obsidian_resources_folder = None
for path in OBSIDIAN_PATHS:
if os.path.exists(path):
obsidian_resources_folder = path
break
if not obsidian_resources_folder:
logging.fatal("[!] Obsidian is not installed")
exit(-1)
delete_obsidian_cache()
for asar_file in ['obsidian.asar', 'app.asar']:
patch_asar(os.path.join(obsidian_resources_folder, asar_file), args.server, True)
if __name__ == '__main__':
main()