32 lines
894 B
Python
32 lines
894 B
Python
"""
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Convenience methods for working with course objects
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"""
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from django.http import Http404
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from opaque_keys import InvalidKeyError
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from opaque_keys.edx.keys import CourseKey
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def course_key_from_string_or_404(course_key_string, message=None):
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"""
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Gets CourseKey from the string passed as parameter.
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Parses course key from string(containing course key) or raises 404 if the string's format is invalid.
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Arguments:
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course_key_string(str): It contains the course key
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message(str): It contains the exception message
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Returns:
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CourseKey: A key that uniquely identifies a course
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Raises:
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HTTP404: A 404 not found exception will be thrown if course_key_string's format is invalid
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"""
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try:
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course_key = CourseKey.from_string(course_key_string)
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except InvalidKeyError:
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raise Http404(message)
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return course_key
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