Python StaticContent.is_versioned_asset_path方法代码示例

# 需要导入模块: from xmodule.contentstore.content import StaticContent [as 别名]
# 或者: from xmodule.contentstore.content.StaticContent import is_versioned_asset_path [as 别名]
 def is_asset_request(self, request):
     """Determines whether the given request is an asset request"""
     return (
         request.path.startswith("/" + XASSET_LOCATION_TAG + "/")
         or request.path.startswith("/" + AssetLocator.CANONICAL_NAMESPACE)
         or StaticContent.is_versioned_asset_path(request.path)
     )

# 需要导入模块: from xmodule.contentstore.content import StaticContent [as 别名]
# 或者: from xmodule.contentstore.content.StaticContent import is_versioned_asset_path [as 别名]
    def process_request(self, request):
        """Process the given request"""
        asset_path = request.path

        if self.is_asset_request(request):
            # Make sure we can convert this request into a location.
            if AssetLocator.CANONICAL_NAMESPACE in asset_path:
                asset_path = asset_path.replace('block/', '[email protected]', 1)

            # If this is a versioned request, pull out the digest and chop off the prefix.
            requested_digest = None
            if StaticContent.is_versioned_asset_path(asset_path):
                requested_digest, asset_path = StaticContent.parse_versioned_asset_path(asset_path)

            # Make sure we have a valid location value for this asset.
            try:
                loc = StaticContent.get_location_from_path(asset_path)
            except (InvalidLocationError, InvalidKeyError):
                return HttpResponseBadRequest()

            # Attempt to load the asset to make sure it exists, and grab the asset digest
            # if we're able to load it.
            actual_digest = None
            try:
                content = self.load_asset_from_location(loc)
                actual_digest = content.content_digest
            except (ItemNotFoundError, NotFoundError):
                return HttpResponseNotFound()

            # If this was a versioned asset, and the digest doesn't match, redirect
            # them to the actual version.
            if requested_digest is not None and (actual_digest != requested_digest):
                actual_asset_path = StaticContent.add_version_to_asset_path(asset_path, actual_digest)
                return HttpResponsePermanentRedirect(actual_asset_path)

            # Set the basics for this request. Make sure that the course key for this
            # asset has a run, which old-style courses do not.  Otherwise, this will
            # explode when the key is serialized to be sent to NR.
            safe_course_key = loc.course_key
            if safe_course_key.run is None:
                safe_course_key = safe_course_key.replace(run='only')

            newrelic.agent.add_custom_parameter('course_id', safe_course_key)
            newrelic.agent.add_custom_parameter('org', loc.org)
            newrelic.agent.add_custom_parameter('contentserver.path', loc.path)

            # Figure out if this is a CDN using us as the origin.
            is_from_cdn = StaticContentServer.is_cdn_request(request)
            newrelic.agent.add_custom_parameter('contentserver.from_cdn', is_from_cdn)

            # Check if this content is locked or not.
            locked = self.is_content_locked(content)
            newrelic.agent.add_custom_parameter('contentserver.locked', locked)

            # Check that user has access to the content.
            if not self.is_user_authorized(request, content, loc):
                return HttpResponseForbidden('Unauthorized')

            # Figure out if the client sent us a conditional request, and let them know
            # if this asset has changed since then.
            last_modified_at_str = content.last_modified_at.strftime(HTTP_DATE_FORMAT)
            if 'HTTP_IF_MODIFIED_SINCE' in request.META:
                if_modified_since = request.META['HTTP_IF_MODIFIED_SINCE']
                if if_modified_since == last_modified_at_str:
                    return HttpResponseNotModified()

            # *** File streaming within a byte range ***
            # If a Range is provided, parse Range attribute of the request
            # Add Content-Range in the response if Range is structurally correct
            # Request -> Range attribute structure: "Range: bytes=first-[last]"
            # Response -> Content-Range attribute structure: "Content-Range: bytes first-last/totalLength"
            # http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.35
            response = None
            if request.META.get('HTTP_RANGE'):
                # If we have a StaticContent, get a StaticContentStream.  Can't manipulate the bytes otherwise.
                if type(content) == StaticContent:
                    content = AssetManager.find(loc, as_stream=True)

                header_value = request.META['HTTP_RANGE']
                try:
                    unit, ranges = parse_range_header(header_value, content.length)
                except ValueError as exception:
                    # If the header field is syntactically invalid it should be ignored.
                    log.exception(
                        u"%s in Range header: %s for content: %s", exception.message, header_value, unicode(loc)
                    )
                else:
                    if unit != 'bytes':
                        # Only accept ranges in bytes
                        log.warning(u"Unknown unit in Range header: %s for content: %s", header_value, unicode(loc))
                    elif len(ranges) > 1:
                        # According to Http/1.1 spec content for multiple ranges should be sent as a multipart message.
                        # http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.16
                        # But we send back the full content.
                        log.warning(
                            u"More than 1 ranges in Range header: %s for content: %s", header_value, unicode(loc)
                        )
                    else:
                        first, last = ranges[0]

#.........这里部分代码省略.........