[daisuki] Add new extractor (closes #4738)

3 files changed, 149 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index f9986ae61..401c5885e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,6 +1,7 @@
 version <unreleased>
 
 Extractors
++ [daisuki] Add new extractor (#2486, #3186, #4738, #6175, #7776, #10060)
 * [douyu] Fix extraction (#12301)
 
 
diff --git a/youtube_dl/extractor/daisuki.py b/youtube_dl/extractor/daisuki.py
new file mode 100644
index 000000000..6fd09faf1
--- /dev/null
+++ b/youtube_dl/extractor/daisuki.py
@@ -0,0 +1,144 @@
+from __future__ import unicode_literals
+
+import base64
+import json
+import random
+import re
+
+from .common import InfoExtractor
+from ..aes import (
+    aes_cbc_decrypt,
+    aes_cbc_encrypt,
+)
+from ..utils import (
+    bytes_to_intlist,
+    bytes_to_long,
+    clean_html,
+    ExtractorError,
+    intlist_to_bytes,
+    get_element_by_id,
+    js_to_json,
+    int_or_none,
+    long_to_bytes,
+    pkcs1pad,
+    remove_end,
+)
+
+
+class DaisukiIE(InfoExtractor):
+    _VALID_URL = r'https?://(?:www\.)?daisuki\.net/[^/]+/[^/]+/[^/]+/watch\.[^.]+\.(?P<id>\d+)\.html'
+
+    _TEST = {
+        'url': 'http://www.daisuki.net/tw/en/anime/watch.TheIdolMasterCG.11213.html',
+        'info_dict': {
+            'id': '11213',
+            'ext': 'mp4',
+            'title': '#01 Who is in the pumpkin carriage? - THE IDOLM@STER CINDERELLA GIRLS',
+            'creator': 'BANDAI NAMCO Entertainment',
+        },
+        'params': {
+            'skip_download': True,  # AES-encrypted HLS stream
+        },
+    }
+
+    # The public key in PEM format can be found in clientlibs_anime_watch.min.js
+    _RSA_KEY = (0xc5524c25e8e14b366b3754940beeb6f96cb7e2feef0b932c7659a0c5c3bf173d602464c2df73d693b513ae06ff1be8f367529ab30bf969c5640522181f2a0c51ea546ae120d3d8d908595e4eff765b389cde080a1ef7f1bbfb07411cc568db73b7f521cedf270cbfbe0ddbc29b1ac9d0f2d8f4359098caffee6d07915020077d, 65537)
+
+    def _real_extract(self, url):
+        video_id = self._match_id(url)
+
+        webpage = self._download_webpage(url, video_id)
+
+        flashvars = self._parse_json(self._search_regex(
+            r'(?s)var\s+flashvars\s*=\s*({.+?});', webpage, 'flashvars'),
+            video_id, transform_source=js_to_json)
+
+        iv = [0] * 16
+
+        data = {}
+        for key in ('device_cd', 'mv_id', 'ss1_prm', 'ss2_prm', 'ss3_prm', 'ss_id'):
+            data[key] = flashvars.get(key, '')
+
+        encrypted_rtn = None
+
+        # Some AES keys are rejected. Try it with different AES keys
+        for idx in range(5):
+            aes_key = [random.randint(0, 254) for _ in range(32)]
+            padded_aeskey = intlist_to_bytes(pkcs1pad(aes_key, 128))
+
+            n, e = self._RSA_KEY
+            encrypted_aeskey = long_to_bytes(pow(bytes_to_long(padded_aeskey), e, n))
+            init_data = self._download_json('http://www.daisuki.net/bin/bgn/init', video_id, query={
+                's': flashvars.get('s', ''),
+                'c': flashvars.get('ss3_prm', ''),
+                'e': url,
+                'd': base64.b64encode(intlist_to_bytes(aes_cbc_encrypt(
+                    bytes_to_intlist(json.dumps(data)),
+                    aes_key, iv))).decode('ascii'),
+                'a': base64.b64encode(encrypted_aeskey).decode('ascii'),
+            }, note='Downloading JSON metadata' + (' (try #%d)' % (idx + 1) if idx > 0 else ''))
+
+            if 'rtn' in init_data:
+                encrypted_rtn = init_data['rtn']
+                break
+
+            self._sleep(5, video_id)
+
+        if encrypted_rtn is None:
+            raise ExtractorError('Failed to fetch init data')
+
+        rtn = self._parse_json(
+            intlist_to_bytes(aes_cbc_decrypt(bytes_to_intlist(
+                base64.b64decode(encrypted_rtn)),
+                aes_key, iv)).decode('utf-8').rstrip('\0'),
+            video_id)
+
+        formats = self._extract_m3u8_formats(
+            rtn['play_url'], video_id, ext='mp4', entry_protocol='m3u8_native')
+
+        title = remove_end(self._og_search_title(webpage), ' - DAISUKI')
+
+        creator = self._html_search_regex(
+            r'Creator\s*:\s*([^<]+)', webpage, 'creator', fatal=False)
+
+        return {
+            'id': video_id,
+            'title': title,
+            'formats': formats,
+            'creator': creator,
+        }
+
+
+class DaisukiPlaylistIE(InfoExtractor):
+    _VALID_URL = r'https?://(?:www\.)daisuki\.net/[^/]+/[^/]+/[^/]+/detail\.(?P<id>[a-zA-Z0-9]+)\.html'
+
+    _TEST = {
+        'url': 'http://www.daisuki.net/tw/en/anime/detail.TheIdolMasterCG.html',
+        'info_dict': {
+            'id': 'TheIdolMasterCG',
+            'title': 'THE IDOLM@STER CINDERELLA GIRLS',
+            'description': 'md5:0f2c028a9339f7a2c7fbf839edc5c5d8',
+        },
+        'playlist_count': 26,
+    }
+
+    def _real_extract(self, url):
+        playlist_id = self._match_id(url)
+
+        webpage = self._download_webpage(url, playlist_id)
+
+        episode_pattern = r'''(?sx)
+            <img[^>]+delay="[^"]+/(\d+)/movie\.jpg".+?
+            <p[^>]+class=".*?\bepisodeNumber\b.*?">(?:<a[^>]+>)?([^<]+)'''
+        entries = [{
+            '_type': 'url_transparent',
+            'url': url.replace('detail', 'watch').replace('.html', '.' + movie_id + '.html'),
+            'episode_id': episode_id,
+            'episode_number': int_or_none(episode_id),
+        } for movie_id, episode_id in re.findall(episode_pattern, webpage)]
+
+        playlist_title = remove_end(
+            self._og_search_title(webpage, fatal=False), ' - Anime - DAISUKI')
+        playlist_description = clean_html(get_element_by_id('synopsisTxt', webpage))
+
+        return self.playlist_result(entries, playlist_id, playlist_title, playlist_description)
diff --git a/youtube_dl/extractor/extractors.py b/youtube_dl/extractor/extractors.py
index 0910b7b05..e251d8478 100644
--- a/youtube_dl/extractor/extractors.py
+++ b/youtube_dl/extractor/extractors.py
@@ -227,6 +227,10 @@ from .dailymotion import (
     DailymotionUserIE,
     DailymotionCloudIE,
 )
+from .daisuki import (
+    DaisukiIE,
+    DaisukiPlaylistIE,
+)
 from .daum import (
     DaumIE,
     DaumClipIE,