[twitch] Rename extractor and support channel videos

1 files changed, 176 insertions, 0 deletions

diff --git a/youtube_dl/extractor/twitch.py b/youtube_dl/extractor/twitch.py
new file mode 100644
index 000000000..42d38b224
--- /dev/null
+++ b/youtube_dl/extractor/twitch.py
@@ -0,0 +1,176 @@
+from __future__ import unicode_literals
+
+import itertools
+import re
+
+from .common import InfoExtractor
+from ..utils import (
+    ExtractorError,
+    parse_iso8601,
+)
+
+
+class TwitchIE(InfoExtractor):
+    # TODO: One broadcast may be split into multiple videos. The key
+    # 'broadcast_id' is the same for all parts, and 'broadcast_part'
+    # starts at 1 and increases. Can we treat all parts as one video?
+    _VALID_URL = r"""(?x)^(?:http://)?(?:www\.)?twitch\.tv/
+        (?:
+            (?P<channelid>[^/]+)|
+            (?:(?:[^/]+)/b/(?P<videoid>[^/]+))|
+            (?:(?:[^/]+)/c/(?P<chapterid>[^/]+))
+        )
+        /?(?:\#.*)?$
+        """
+    _PAGE_LIMIT = 100
+    _API_BASE = 'https://api.twitch.tv'
+    _TEST = {
+        'url': 'http://www.twitch.tv/thegamedevhub/b/296128360',
+        'md5': 'ecaa8a790c22a40770901460af191c9a',
+        'info_dict': {
+            'id': '296128360',
+            'ext': 'flv',
+            'upload_date': '20110927',
+            'uploader_id': 25114803,
+            'uploader': 'thegamedevhub',
+            'title': 'Beginner Series - Scripting With Python Pt.1'
+        }
+    }
+
+    def _handle_error(self, response):
+        if not isinstance(response, dict):
+            return
+        error = response.get('error')
+        if error:
+            raise ExtractorError(
+                '%s returned error: %s - %s' % (self.IE_NAME, error, response.get('message')),
+                expected=True)
+
+    def _download_json(self, url, video_id, note='Downloading JSON metadata'):
+        response = super(TwitchIE, self)._download_json(url, video_id, note)
+        self._handle_error(response)
+        return response
+
+    def _extract_media(self, item, item_id):
+        ITEMS = {
+            'a': 'video',
+            'c': 'chapter',
+        }
+        info = self._extract_info(self._download_json(
+            '%s/kraken/videos/%s%s' % (self._API_BASE, item, item_id), item_id,
+            'Downloading %s info JSON' % ITEMS[item]))
+        response = self._download_json(
+            '%s/api/videos/%s%s' % (self._API_BASE, item, item_id), item_id,
+            'Downloading %s playlist JSON' % ITEMS[item])
+        entries = []
+        chunks = response['chunks']
+        qualities = list(chunks.keys())
+        for num, fragment in enumerate(zip(*chunks.values()), start=1):
+            formats = []
+            for fmt_num, fragment_fmt in enumerate(fragment):
+                format_id = qualities[fmt_num]
+                fmt = {
+                    'url': fragment_fmt['url'],
+                    'format_id': format_id,
+                    'quality': 1 if format_id == 'live' else 0,
+                }
+                m = re.search(r'^(?P<height>\d+)[Pp]', format_id)
+                if m:
+                    fmt['height'] = int(m.group('height'))
+                formats.append(fmt)
+            self._sort_formats(formats)
+            entry = dict(info)
+            entry['title'] = '%s part %d' % (entry['title'], num)
+            entry['formats'] = formats
+            entries.append(entry)
+        return entries
+
+    def _extract_info(self, info):
+        return {
+            'id': info['_id'],
+            'title': info['title'],
+            'description': info['description'],
+            'duration': info['length'],
+            'thumbnail': info['preview'],
+            'uploader': info['channel']['display_name'],
+            'uploader_id': info['channel']['name'],
+            'timestamp': parse_iso8601(info['recorded_at']),
+            'view_count': info['views'],
+        }
+
+    def _real_extract(self, url):
+        mobj = re.match(self._VALID_URL, url)
+        if mobj.group('chapterid'):
+            return self._extract_media('c', mobj.group('chapterid'))
+
+            """
+            webpage = self._download_webpage(url, chapter_id)
+            m = re.search(r'PP\.archive_id = "([0-9]+)";', webpage)
+            if not m:
+                raise ExtractorError('Cannot find archive of a chapter')
+            archive_id = m.group(1)
+
+            api = api_base + '/broadcast/by_chapter/%s.xml' % chapter_id
+            doc = self._download_xml(
+                api, chapter_id,
+                note='Downloading chapter information',
+                errnote='Chapter information download failed')
+            for a in doc.findall('.//archive'):
+                if archive_id == a.find('./id').text:
+                    break
+            else:
+                raise ExtractorError('Could not find chapter in chapter information')
+
+            video_url = a.find('./video_file_url').text
+            video_ext = video_url.rpartition('.')[2] or 'flv'
+
+            chapter_api_url = 'https://api.twitch.tv/kraken/videos/c' + chapter_id
+            chapter_info = self._download_json(
+                chapter_api_url, 'c' + chapter_id,
+                note='Downloading chapter metadata',
+                errnote='Download of chapter metadata failed')
+
+            bracket_start = int(doc.find('.//bracket_start').text)
+            bracket_end = int(doc.find('.//bracket_end').text)
+
+            # TODO determine start (and probably fix up file)
+            #  youtube-dl -v http://www.twitch.tv/firmbelief/c/1757457
+            #video_url += '?start=' + TODO:start_timestamp
+            # bracket_start is 13290, but we want 51670615
+            self._downloader.report_warning('Chapter detected, but we can just download the whole file. '
+                                            'Chapter starts at %s and ends at %s' % (formatSeconds(bracket_start), formatSeconds(bracket_end)))
+
+            info = {
+                'id': 'c' + chapter_id,
+                'url': video_url,
+                'ext': video_ext,
+                'title': chapter_info['title'],
+                'thumbnail': chapter_info['preview'],
+                'description': chapter_info['description'],
+                'uploader': chapter_info['channel']['display_name'],
+                'uploader_id': chapter_info['channel']['name'],
+            }
+            return info
+            """
+        elif mobj.group('videoid'):
+            return self._extract_media('a', mobj.group('videoid'))
+        elif mobj.group('channelid'):
+            channel_id = mobj.group('channelid')
+            info = self._download_json(
+                '%s/kraken/channels/%s' % (self._API_BASE, channel_id),
+                channel_id, 'Downloading channel info JSON')
+            channel_name = info.get('display_name') or info.get('name')
+            entries = []
+            offset = 0
+            limit = self._PAGE_LIMIT
+            for counter in itertools.count(1):
+                response = self._download_json(
+                    '%s/kraken/channels/%s/videos/?offset=%d&limit=%d'
+                    % (self._API_BASE, channel_id, offset, limit),
+                    channel_id, 'Downloading channel videos JSON page %d' % counter)
+                videos = response['videos']
+                if not videos:
+                    break
+                entries.extend([self.url_result(video['url'], 'Twitch') for video in videos])
+                offset += limit
+            return self.playlist_result(entries, channel_id, channel_name)