50 lines
1.4 KiB
Python
50 lines
1.4 KiB
Python
""" Utility functions related to HTTP requests """
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import re
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from django.conf import settings
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from opaque_keys import InvalidKeyError
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from opaque_keys.edx.keys import CourseKey
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from openedx.core.djangoapps.site_configuration import helpers as configuration_helpers
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# accommodates course api urls, excluding any course api routes that do not fall under v*/courses, such as v1/blocks.
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COURSE_REGEX = re.compile(r'^(.*?/courses/)(?!v[0-9]+/[^/]+){}'.format(settings.COURSE_ID_PATTERN))
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def safe_get_host(request):
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"""
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Get the host name for this request, as safely as possible.
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If ALLOWED_HOSTS is properly set, this calls request.get_host;
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otherwise, this returns whatever settings.SITE_NAME is set to.
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This ensures we will never accept an untrusted value of get_host()
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"""
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if isinstance(settings.ALLOWED_HOSTS, (list, tuple)) and '*' not in settings.ALLOWED_HOSTS:
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return request.get_host()
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else:
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return configuration_helpers.get_value('site_domain', settings.SITE_NAME)
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def course_id_from_url(url):
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"""
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Extracts the course_id from the given `url`.
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"""
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if not url:
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return None
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match = COURSE_REGEX.match(url)
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if match is None:
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return None
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course_id = match.group('course_id')
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if course_id is None:
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return None
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try:
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return CourseKey.from_string(course_id)
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except InvalidKeyError:
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return None
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