[EsriVideo] Add new extractor

Add extractor for [videos.esri.com](https://videos.esri.com), a collection
of videos relating to GIS.

youtube_dl/extractor/__init__.py

@@ -695,6 +695,7 @@
 from .viddler import ViddlerIE
 from .videobam import VideoBamIE
 from .videodetective import VideoDetectiveIE
+from .videoesri import VideoEsriIE
 from .videolecturesnet import VideoLecturesNetIE
 from .videofyme import VideofyMeIE
 from .videomega import VideoMegaIE

youtube_dl/extractor/videoesri.py

@@ -0,0 +1,90 @@
+# coding: utf-8
+from __future__ import unicode_literals
+
+import os
+import re
+
+from .common import InfoExtractor
+
+from ..utils import (
+    unified_strdate
+)
+
+
+class VideoEsriIE(InfoExtractor):
+    _VALID_URL = r'https?://video\.esri\.com/watch/(?P<id>[0-9]+)'
+    _TEST = {
+        'url': 'https://video.esri.com/watch/4228',
+        'md5': '170b4d513c2466ed483c150a48384133',
+        'info_dict': {
+            'id': '4228',
+            'ext': 'mp4',
+            'title': 'AppStudio for ArcGIS',
+            'thumbnail': 're:^https?://.*\.jpg$',
+            'upload_date': '20150310',
+        }
+    }
+
+    def _real_extract(self, url):
+        video_id = self._match_id(url)
+        webpage = self._download_webpage(url, video_id)
+
+        title = self._html_search_regex(r'<h1>(.*?)</h1>', webpage, 'title')
+
+        upload_date_raw = self._search_regex(
+            r'http-equiv="last-modified" content="(.*)"',
+            webpage, 'upload date')
+        upload_date = unified_strdate(upload_date_raw)
+
+        settings_info = self._search_regex(
+            r'evPlayerSettings = {(.*?);\s*$',
+            webpage, 'settings info', flags=re.MULTILINE | re.DOTALL)
+
+        # thumbnail includes '_x' for large, also has {_m,_t,_s} or
+        # without size suffix returns full image
+        thumbnail_path = re.findall(
+            r'image\': \'(\/thumbs.*)\'',
+            settings_info)[0]
+
+        if thumbnail_path:
+            thumbnail = '/'.join(['http://video.esri.com', thumbnail_path])
+
+        # note that this misses the (exceedly rare) webm files
+        video_paths = re.findall(r'mp4:(.*)\'', settings_info)
+
+        # find possible http servers of the mp4 files (also has rtsp)
+        base_url = re.findall(
+            r'netstreambasepath\':\s\'(h.*)\'', settings_info)[0]
+
+        # these are the numbers used internally, but really map
+        # to other resolutions, e.g. 960 is 720p.
+        heights = [480, 720, 960]
+        videos_by_res = {}
+        for video_path in video_paths:
+            url = "{base_url}{video_path}".format(
+                base_url=base_url,
+                video_path=video_path)
+            filename, ext = os.path.splitext(video_path)
+            height_label = int(filename.split('_')[1])
+            videos_by_res[height_label] = {
+                'url': url,
+                'ext': ext[1:],
+                'protocol': 'http',  # http-only supported currently
+            }
+
+        formats = []
+        for height in heights:
+            if height in videos_by_res:
+                formats.append(videos_by_res[height])
+
+        result = {
+            'id': video_id,
+            'title': title,
+            'upload_date': upload_date,
+            'formats': formats,
+        }
+
+        if thumbnail:
+            result['thumbnail'] = thumbnail
+
+        return result