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[fragment,aria2c] Generalize and refactor some code

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pukkandan
2021-09-22 05:27:07 +05:30
parent bd6f722de8
commit 1009f67c2a
2 changed files with 30 additions and 42 deletions
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45
yt_dlp/downloader/fragment.py
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@@ -324,6 +324,29 @@ class FragmentFD(FileDownloader):
'fragment_index': 0,
})
def decrypter(self, info_dict):
_key_cache = {}
def _get_key(url):
if url not in _key_cache:
_key_cache[url] = self.ydl.urlopen(self._prepare_url(info_dict, url)).read()
return _key_cache[url]
def decrypt_fragment(fragment, frag_content):
decrypt_info = fragment.get('decrypt_info')
if not decrypt_info or decrypt_info['METHOD'] != 'AES-128':
return frag_content
iv = decrypt_info.get('IV') or compat_struct_pack('>8xq', fragment['media_sequence'])
decrypt_info['KEY'] = decrypt_info.get('KEY') or _get_key(info_dict.get('_decryption_key_url') or decrypt_info['URI'])
# Don't decrypt the content in tests since the data is explicitly truncated and it's not to a valid block
# size (see https://github.com/ytdl-org/youtube-dl/pull/27660). Tests only care that the correct data downloaded,
# not what it decrypts to.
if self.params.get('test', False):
return frag_content
return aes_cbc_decrypt_bytes(frag_content, decrypt_info['KEY'], iv)
return decrypt_fragment
def download_and_append_fragments(self, ctx, fragments, info_dict, *, pack_func=None, finish_func=None):
fragment_retries = self.params.get('fragment_retries', 0)
is_fatal = (lambda idx: idx == 0) if self.params.get('skip_unavailable_fragments', True) else (lambda _: True)
@@ -369,26 +392,6 @@ class FragmentFD(FileDownloader):
return False, frag_index
return frag_content, frag_index
_key_cache = {}
def _get_key(url):
if url not in _key_cache:
_key_cache[url] = self.ydl.urlopen(self._prepare_url(info_dict, url)).read()
return _key_cache[url]
def decrypt_fragment(fragment, frag_content):
decrypt_info = fragment.get('decrypt_info')
if not decrypt_info or decrypt_info['METHOD'] != 'AES-128':
return frag_content
iv = decrypt_info.get('IV') or compat_struct_pack('>8xq', fragment['media_sequence'])
decrypt_info['KEY'] = decrypt_info.get('KEY') or _get_key(info_dict.get('_decryption_key_url') or decrypt_info['URI'])
# Don't decrypt the content in tests since the data is explicitly truncated and it's not to a valid block
# size (see https://github.com/ytdl-org/youtube-dl/pull/27660). Tests only care that the correct data downloaded,
# not what it decrypts to.
if self.params.get('test', False):
return frag_content
return aes_cbc_decrypt_bytes(frag_content, decrypt_info['KEY'], iv)
def append_fragment(frag_content, frag_index, ctx):
if not frag_content:
if not is_fatal(frag_index - 1):
@@ -402,6 +405,8 @@ class FragmentFD(FileDownloader):
self._append_fragment(ctx, pack_func(frag_content, frag_index))
return True
decrypt_fragment = self.decrypter(info_dict)
max_workers = self.params.get('concurrent_fragment_downloads', 1)
if can_threaded_download and max_workers > 1: