track custom youtube-dl distribution

1 files changed, 187 insertions, 0 deletions

diff --git a/youtube_dl/update.py b/youtube_dl/update.py
new file mode 100644
index 0000000..ebce966
--- /dev/null
+++ b/youtube_dl/update.py
@@ -0,0 +1,187 @@
+from __future__ import unicode_literals
+
+import io
+import json
+import traceback
+import hashlib
+import os
+import subprocess
+import sys
+from zipimport import zipimporter
+
+from .utils import encode_compat_str
+
+from .version import __version__
+
+
+def rsa_verify(message, signature, key):
+    from hashlib import sha256
+    assert isinstance(message, bytes)
+    byte_size = (len(bin(key[0])) - 2 + 8 - 1) // 8
+    signature = ('%x' % pow(int(signature, 16), key[1], key[0])).encode()
+    signature = (byte_size * 2 - len(signature)) * b'0' + signature
+    asn1 = b'3031300d060960864801650304020105000420'
+    asn1 += sha256(message).hexdigest().encode()
+    if byte_size < len(asn1) // 2 + 11:
+        return False
+    expected = b'0001' + (byte_size - len(asn1) // 2 - 3) * b'ff' + b'00' + asn1
+    return expected == signature
+
+
+def update_self(to_screen, verbose, opener):
+    """Update the program file with the latest version from the repository"""
+
+    UPDATE_URL = 'https://rg3.github.io/youtube-dl/update/'
+    VERSION_URL = UPDATE_URL + 'LATEST_VERSION'
+    JSON_URL = UPDATE_URL + 'versions.json'
+    UPDATES_RSA_KEY = (0x9d60ee4d8f805312fdb15a62f87b95bd66177b91df176765d13514a0f1754bcd2057295c5b6f1d35daa6742c3ffc9a82d3e118861c207995a8031e151d863c9927e304576bc80692bc8e094896fcf11b66f3e29e04e3a71e9a11558558acea1840aec37fc396fb6b65dc81a1c4144e03bd1c011de62e3f1357b327d08426fe93, 65537)
+
+    if not isinstance(globals().get('__loader__'), zipimporter) and not hasattr(sys, 'frozen'):
+        to_screen('It looks like you installed youtube-dl with a package manager, pip, setup.py or a tarball. Please use that to update.')
+        return
+
+    # Check if there is a new version
+    try:
+        newversion = opener.open(VERSION_URL).read().decode('utf-8').strip()
+    except Exception:
+        if verbose:
+            to_screen(encode_compat_str(traceback.format_exc()))
+        to_screen('ERROR: can\'t find the current version. Please try again later.')
+        return
+    if newversion == __version__:
+        to_screen('youtube-dl is up-to-date (' + __version__ + ')')
+        return
+
+    # Download and check versions info
+    try:
+        versions_info = opener.open(JSON_URL).read().decode('utf-8')
+        versions_info = json.loads(versions_info)
+    except Exception:
+        if verbose:
+            to_screen(encode_compat_str(traceback.format_exc()))
+        to_screen('ERROR: can\'t obtain versions info. Please try again later.')
+        return
+    if 'signature' not in versions_info:
+        to_screen('ERROR: the versions file is not signed or corrupted. Aborting.')
+        return
+    signature = versions_info['signature']
+    del versions_info['signature']
+    if not rsa_verify(json.dumps(versions_info, sort_keys=True).encode('utf-8'), signature, UPDATES_RSA_KEY):
+        to_screen('ERROR: the versions file signature is invalid. Aborting.')
+        return
+
+    version_id = versions_info['latest']
+
+    def version_tuple(version_str):
+        return tuple(map(int, version_str.split('.')))
+    if version_tuple(__version__) >= version_tuple(version_id):
+        to_screen('youtube-dl is up to date (%s)' % __version__)
+        return
+
+    to_screen('Updating to version ' + version_id + ' ...')
+    version = versions_info['versions'][version_id]
+
+    print_notes(to_screen, versions_info['versions'])
+
+    # sys.executable is set to the full pathname of the exe-file for py2exe
+    filename = sys.executable if hasattr(sys, 'frozen') else sys.argv[0]
+
+    if not os.access(filename, os.W_OK):
+        to_screen('ERROR: no write permissions on %s' % filename)
+        return
+
+    # Py2EXE
+    if hasattr(sys, 'frozen'):
+        exe = filename
+        directory = os.path.dirname(exe)
+        if not os.access(directory, os.W_OK):
+            to_screen('ERROR: no write permissions on %s' % directory)
+            return
+
+        try:
+            urlh = opener.open(version['exe'][0])
+            newcontent = urlh.read()
+            urlh.close()
+        except (IOError, OSError):
+            if verbose:
+                to_screen(encode_compat_str(traceback.format_exc()))
+            to_screen('ERROR: unable to download latest version')
+            return
+
+        newcontent_hash = hashlib.sha256(newcontent).hexdigest()
+        if newcontent_hash != version['exe'][1]:
+            to_screen('ERROR: the downloaded file hash does not match. Aborting.')
+            return
+
+        try:
+            with open(exe + '.new', 'wb') as outf:
+                outf.write(newcontent)
+        except (IOError, OSError):
+            if verbose:
+                to_screen(encode_compat_str(traceback.format_exc()))
+            to_screen('ERROR: unable to write the new version')
+            return
+
+        try:
+            bat = os.path.join(directory, 'youtube-dl-updater.bat')
+            with io.open(bat, 'w') as batfile:
+                batfile.write('''
+@echo off
+echo Waiting for file handle to be closed ...
+ping 127.0.0.1 -n 5 -w 1000 > NUL
+move /Y "%s.new" "%s" > NUL
+echo Updated youtube-dl to version %s.
+start /b "" cmd /c del "%%~f0"&exit /b"
+                \n''' % (exe, exe, version_id))
+
+            subprocess.Popen([bat])  # Continues to run in the background
+            return  # Do not show premature success messages
+        except (IOError, OSError):
+            if verbose:
+                to_screen(encode_compat_str(traceback.format_exc()))
+            to_screen('ERROR: unable to overwrite current version')
+            return
+
+    # Zip unix package
+    elif isinstance(globals().get('__loader__'), zipimporter):
+        try:
+            urlh = opener.open(version['bin'][0])
+            newcontent = urlh.read()
+            urlh.close()
+        except (IOError, OSError):
+            if verbose:
+                to_screen(encode_compat_str(traceback.format_exc()))
+            to_screen('ERROR: unable to download latest version')
+            return
+
+        newcontent_hash = hashlib.sha256(newcontent).hexdigest()
+        if newcontent_hash != version['bin'][1]:
+            to_screen('ERROR: the downloaded file hash does not match. Aborting.')
+            return
+
+        try:
+            with open(filename, 'wb') as outf:
+                outf.write(newcontent)
+        except (IOError, OSError):
+            if verbose:
+                to_screen(encode_compat_str(traceback.format_exc()))
+            to_screen('ERROR: unable to overwrite current version')
+            return
+
+    to_screen('Updated youtube-dl. Restart youtube-dl to use the new version.')
+
+
+def get_notes(versions, fromVersion):
+    notes = []
+    for v, vdata in sorted(versions.items()):
+        if v > fromVersion:
+            notes.extend(vdata.get('notes', []))
+    return notes
+
+
+def print_notes(to_screen, versions, fromVersion=__version__):
+    notes = get_notes(versions, fromVersion)
+    if notes:
+        to_screen('PLEASE NOTE:')
+        for note in notes:
+            to_screen(note)