124 lines
3.8 KiB
Python
124 lines
3.8 KiB
Python
"""
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Module contains utils specific for video_module but not for transcripts.
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"""
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import logging
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from collections import OrderedDict
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from urllib.parse import parse_qs, urlencode, urlparse, urlsplit, urlunsplit
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from django.conf import settings
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from django.core.exceptions import ValidationError
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from django.core.validators import URLValidator
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log = logging.getLogger(__name__)
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def create_youtube_string(module):
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"""
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Create a string of Youtube IDs from `module`'s metadata
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attributes. Only writes a speed if an ID is present in the
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module. Necessary for backwards compatibility with XML-based
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courses.
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"""
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youtube_ids = [
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module.youtube_id_0_75,
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module.youtube_id_1_0,
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module.youtube_id_1_25,
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module.youtube_id_1_5
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]
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youtube_speeds = ['0.75', '1.00', '1.25', '1.50']
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return ','.join([
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':'.join(pair)
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for pair
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in zip(youtube_speeds, youtube_ids)
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if pair[1]
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])
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def rewrite_video_url(cdn_base_url, original_video_url):
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"""
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Returns a re-written video URL for cases when an alternate source
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has been configured and is selected using factors like
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user location.
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Re-write rules for country codes are specified via the
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EDX_VIDEO_CDN_URLS configuration structure.
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:param cdn_base_url: The scheme, hostname, port and any relevant path prefix for the alternate CDN,
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for example: https://mirror.example.cn/edx
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:param original_video_url: The canonical source for this video, for example:
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https://cdn.example.com/edx-course-videos/VIDEO101/001.mp4
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:return: The re-written URL
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"""
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if (not cdn_base_url) or (not original_video_url):
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return None
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parsed = urlparse(original_video_url)
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# Contruction of the rewrite url is intentionally very flexible of input.
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# For example, https://www.edx.org/ + /foo.html will be rewritten to
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# https://www.edx.org/foo.html.
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rewritten_url = cdn_base_url.rstrip("/") + "/" + parsed.path.lstrip("/")
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validator = URLValidator()
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try:
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validator(rewritten_url)
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return rewritten_url
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except ValidationError:
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log.warning("Invalid CDN rewrite URL encountered, %s", rewritten_url)
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# Mimic the behavior of removed get_video_from_cdn in this regard and
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# return None causing the caller to use the original URL.
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return None
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def get_poster(video):
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"""
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Generate poster metadata.
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youtube_streams is string that contains '1.00:youtube_id'
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Poster metadata is dict of youtube url for image thumbnail and edx logo
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"""
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if not video.bumper.get("enabled"):
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return
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poster = OrderedDict({"url": "", "type": ""})
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if video.youtube_streams:
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youtube_id = video.youtube_streams.split('1.00:')[1].split(',')[0]
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poster["url"] = settings.YOUTUBE['IMAGE_API'].format(youtube_id=youtube_id)
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poster["type"] = "youtube"
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else:
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poster["url"] = "https://www.edx.org/sites/default/files/theme/edx-logo-header.png"
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poster["type"] = "html5"
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return poster
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def format_xml_exception_message(location, key, value):
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"""
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Generate exception message for VideoBlock class which will use for ValueError and UnicodeDecodeError
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when setting xml attributes.
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"""
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exception_message = "Block-location:{location}, Key:{key}, Value:{value}".format(
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location=str(location),
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key=key,
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value=value
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)
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return exception_message
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def set_query_parameter(url, param_name, param_value):
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"""
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Given a URL, set or replace a query parameter and return the
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modified URL.
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"""
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scheme, netloc, path, query_string, fragment = urlsplit(url)
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query_params = parse_qs(query_string)
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query_params[param_name] = [param_value]
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new_query_string = urlencode(query_params, doseq=True)
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return urlunsplit((scheme, netloc, path, new_query_string, fragment))
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