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[youtubedl] / youtube_dl / extractor / howstuffworks.py
1 from __future__ import unicode_literals
2
3 import re
4 import json
5 import random
6 import string
7
8 from .common import InfoExtractor
9 from ..utils import find_xpath_attr
10
11
12 class HowStuffWorksIE(InfoExtractor):
13 _VALID_URL = r'https?://[\da-z-]+\.howstuffworks\.com/(?:[^/]+/)*\d+-(?P<id>.+?)-video\.htm'
14 _TESTS = [
15 {
16 'url': 'http://adventure.howstuffworks.com/5266-cool-jobs-iditarod-musher-video.htm',
17 'info_dict': {
18 'id': '450221',
19 'display_id': 'cool-jobs-iditarod-musher',
20 'ext': 'flv',
21 'title': 'Cool Jobs - Iditarod Musher',
22 'description': 'md5:82bb58438a88027b8186a1fccb365f90',
23 'thumbnail': 're:^https?://.*\.jpg$',
24 },
25 'params': {
26 # md5 is not consistent
27 'skip_download': True
28 }
29 },
30 {
31 'url': 'http://adventure.howstuffworks.com/7199-survival-zone-food-and-water-in-the-savanna-video.htm',
32 'info_dict': {
33 'id': '453464',
34 'display_id': 'survival-zone-food-and-water-in-the-savanna',
35 'ext': 'mp4',
36 'title': 'Survival Zone: Food and Water In the Savanna',
37 'description': 'md5:7e1c89f6411434970c15fa094170c371',
38 'thumbnail': 're:^https?://.*\.jpg$',
39 },
40 'params': {
41 # md5 is not consistent
42 'skip_download': True
43 }
44 },
45 {
46 'url': 'http://entertainment.howstuffworks.com/arts/2706-sword-swallowing-1-by-dan-meyer-video.htm',
47 'info_dict': {
48 'id': '440011',
49 'display_id': 'sword-swallowing-1-by-dan-meyer',
50 'ext': 'flv',
51 'title': 'Sword Swallowing #1 by Dan Meyer',
52 'description': 'md5:b2409e88172913e2e7d3d1159b0ef735',
53 'thumbnail': 're:^https?://.*\.jpg$',
54 },
55 'params': {
56 # md5 is not consistent
57 'skip_download': True
58 }
59 },
60 ]
61
62 def _real_extract(self, url):
63 mobj = re.match(self._VALID_URL, url)
64 display_id = mobj.group('id')
65 webpage = self._download_webpage(url, display_id)
66
67 content_id = self._search_regex(r'var siteSectionId="(\d+)";', webpage, 'content id')
68
69 mp4 = self._search_regex(
70 r'''(?xs)var\s+clip\s*=\s*{\s*
71 .+?\s*
72 content_id\s*:\s*%s\s*,\s*
73 .+?\s*
74 mp4\s*:\s*\[(.*?),?\]\s*
75 };\s*
76 videoData\.push\(clip\);''' % content_id,
77 webpage, 'mp4', fatal=False, default=None)
78
79 smil = self._download_xml(
80 'http://services.media.howstuffworks.com/videos/%s/smil-service.smil' % content_id,
81 content_id, 'Downloading video SMIL')
82
83 http_base = find_xpath_attr(
84 smil,
85 './{0}head/{0}meta'.format('{http://www.w3.org/2001/SMIL20/Language}'),
86 'name',
87 'httpBase').get('content')
88
89 def random_string(str_len=0):
90 return ''.join([random.choice(string.ascii_uppercase) for _ in range(str_len)])
91
92 URL_SUFFIX = '?v=2.11.3&fp=LNX 11,2,202,356&r=%s&g=%s' % (random_string(5), random_string(12))
93
94 formats = []
95
96 if mp4:
97 for video in json.loads('[%s]' % mp4):
98 bitrate = video['bitrate']
99 fmt = {
100 'url': video['src'].replace('http://pmd.video.howstuffworks.com', http_base) + URL_SUFFIX,
101 'format_id': bitrate,
102 }
103 m = re.search(r'(?P<vbr>\d+)[Kk]', bitrate)
104 if m:
105 fmt['vbr'] = int(m.group('vbr'))
106 formats.append(fmt)
107 else:
108 for video in smil.findall(
109 './/{0}body/{0}switch/{0}video'.format('{http://www.w3.org/2001/SMIL20/Language}')):
110 vbr = int(video.attrib['system-bitrate']) / 1000
111 formats.append({
112 'url': '%s/%s%s' % (http_base, video.attrib['src'], URL_SUFFIX),
113 'format_id': '%dk' % vbr,
114 'vbr': vbr,
115 })
116
117 self._sort_formats(formats)
118
119 title = self._og_search_title(webpage)
120 TITLE_SUFFIX = ' : HowStuffWorks'
121 if title.endswith(TITLE_SUFFIX):
122 title = title[:-len(TITLE_SUFFIX)]
123
124 description = self._og_search_description(webpage)
125 thumbnail = self._og_search_thumbnail(webpage)
126
127 return {
128 'id': content_id,
129 'display_id': display_id,
130 'title': title,
131 'description': description,
132 'thumbnail': thumbnail,
133 'formats': formats,
134 }