Add safaribooksonline extractor
diff --git a/youtube_dl/extractor/__init__.py b/youtube_dl/extractor/__init__.py
index d73826d44bf..3a0c42deda3 100644
--- a/youtube_dl/extractor/__init__.py
+++ b/youtube_dl/extractor/__init__.py
@@ -420,6 +420,10 @@
 )
 from .rutv import RUTVIE
 from .sandia import SandiaIE
+from .safari import (
+    SafariIE,
+    SafariCourseIE,
+)
 from .sapo import SapoIE
 from .savefrom import SaveFromIE
 from .sbs import SBSIE
diff --git a/youtube_dl/extractor/safari.py b/youtube_dl/extractor/safari.py
new file mode 100644
index 00000000000..3e494b9605c
--- /dev/null
+++ b/youtube_dl/extractor/safari.py
@@ -0,0 +1,144 @@
+# encoding: utf-8
+from __future__ import unicode_literals
+
+import re
+import json
+
+from .common import InfoExtractor
+from .brightcove import BrightcoveIE
+
+from ..compat import (
+    compat_urllib_parse,
+    compat_urllib_request,
+)
+from ..utils import (
+    ExtractorError,
+    smuggle_url,
+    std_headers,
+)
+
+
+class SafariBaseIE(InfoExtractor):
+    _LOGIN_URL = 'https://www.safaribooksonline.com/accounts/login/'
+    _SUCCESSFUL_LOGIN_REGEX = r'<a href="/accounts/logout/"[^>]+>Sign Out</a>'
+    _ACCOUNT_CREDENTIALS_HINT = ('Use --username and --password options to '
+                                 'supply credentials for safaribooksonline.com ')
+    _NETRC_MACHINE = 'safaribooksonline'
+
+    LOGGED_IN = False
+
+    def _real_initialize(self):
+        # We only need to log in once for courses or individual videos
+        if not SafariBaseIE.LOGGED_IN:
+            self._login()
+            SafariBaseIE.LOGGED_IN = True
+
+    def _login(self):
+        (username, password) = self._get_login_info()
+        if username is None:
+            raise ExtractorError(
+                self._ACCOUNT_CREDENTIALS_HINT,
+                expected=True)
+
+        headers = std_headers
+        if 'Referer' not in headers:
+            headers['Referer'] = self._LOGIN_URL
+
+        login_page = self._download_webpage(
+            self._LOGIN_URL, None,
+            'Downloading login form')
+
+        csrf = self._html_search_regex(
+            r"<input +type='hidden' +name='csrfmiddlewaretoken' +value='([^']+)' +/>",
+            login_page, 'csrf token')
+
+        login_form = {
+            'csrfmiddlewaretoken': csrf,
+            'email': username,
+            'password1': password,
+            'login': 'Sign In',
+            'next': '',
+        }
+
+        request = compat_urllib_request.Request(
+            self._LOGIN_URL, compat_urllib_parse.urlencode(login_form), headers=headers)
+        login_page = self._download_webpage(
+            request, None, 'Logging in as %s' % username)
+
+        if re.search(self._SUCCESSFUL_LOGIN_REGEX, login_page) is None:
+            raise ExtractorError('Login failed; make sure your credentials are correct and '
+                                 'try again.', expected=True)
+
+        self.to_screen('Login successful')
+
+
+class SafariIE(SafariBaseIE):
+    IE_NAME = 'safari'
+    IE_DESC = 'safaribooksonline.com online video'
+    _VALID_URL = (r'https?://(?:www\.)?safaribooksonline\.com/library/view/[^/]+/'
+                  '(?P<id>\d+)/(?P<part>part\d+)\.html')
+    _TEST = {
+        'url': ('https://www.safaribooksonline.com/library/view/'
+                'hadoop-fundamentals-livelessons/9780133392838/part00.html'),
+        'md5': '5b0c4cc1b3c1ba15dda7344085aa5592',
+        'info_dict': {
+            'id': '9780133392838',
+            'ext': 'mp4',
+            'title': 'Introduction',
+        }
+    }
+
+    def _real_extract(self, url):
+        mobj = re.match(self._VALID_URL, url)
+        part = mobj.group('part')
+
+        webpage = self._download_webpage(url, part)
+        bc_url = BrightcoveIE._extract_brightcove_url(webpage)
+        if not bc_url:
+            raise ExtractorError('Could not extract Brightcove URL from %s' % url, expected=True)
+
+        return {
+            '_type': 'url',
+            'url': smuggle_url(bc_url, {'Referer': url}),
+            'ie_key': 'Brightcove'
+        }
+
+
+class SafariCourseIE(SafariBaseIE):
+    IE_NAME = 'safari:course'
+    IE_DESC = 'safaribooksonline.com online courses'
+
+    _VALID_URL = (r'https?://(?:www\.)?safaribooksonline\.com/library/view/'
+                  '(?P<course_path>[^/]+)/(?P<id>\d+)/?$')
+
+    _API_BASE = 'https://www.safaribooksonline.com/api/v1/book'
+    _API_FORMAT = 'json'
+
+    def _real_extract(self, url):
+        mobj = re.match(self._VALID_URL, url)
+        course_path = mobj.group('course_path')
+        course_id = mobj.group('id')
+
+        webpage = self._download_webpage(
+            '%s/%s/?override_format=%s' % (self._API_BASE, course_id, self._API_FORMAT),
+            course_path, 'Downloading course JSON')
+
+        course_json = json.loads(webpage)
+
+        if 'chapters' not in course_json:
+            raise ExtractorError('No chapters found for course %s' % course_id, expected=True)
+
+        num_parts = len(course_json['chapters'])
+        parts = ['%02d' % part for part in range(num_parts)]
+
+        entries = [
+            self.url_result(
+                'https://www.safaribooksonline.com/library/view/%s/%s/part%s.html' % (course_path,
+                                                                                      course_id,
+                                                                                      part_id),
+                'Safari')
+            for part_id in parts]
+
+        course_title = course_json['title']
+
+        return self.playlist_result(entries, course_id, course_title)

Following on from https://github.com/rg3/youtube-dl/issues/5253, I decided to give implementing this a go myself.
