Esempio n. 1
0
    def forward_request(self, method, path, data, headers):

        # check region
        try:
            aws_stack.check_valid_region(headers)
        except Exception as e:
            return make_error(message=str(e), code=400)

        if method == 'POST' and path == '/':
            req_data = urlparse.parse_qs(to_str(data))
            req_action = req_data['Action'][0]
            topic_arn = req_data.get('TargetArn') or req_data.get('TopicArn')

            if topic_arn:
                topic_arn = topic_arn[0]
                do_create_topic(topic_arn)

            if req_action == 'SetSubscriptionAttributes':
                sub = get_subscription_by_arn(req_data['SubscriptionArn'][0])
                if not sub:
                    return make_error(
                        message='Unable to find subscription for given ARN',
                        code=400)
                attr_name = req_data['AttributeName'][0]
                attr_value = req_data['AttributeValue'][0]
                sub[attr_name] = attr_value
                return make_response(req_action)
            elif req_action == 'GetSubscriptionAttributes':
                sub = get_subscription_by_arn(req_data['SubscriptionArn'][0])
                if not sub:
                    return make_error(
                        message='Unable to find subscription for given ARN',
                        code=400)
                content = '<Attributes>'
                for key, value in sub.items():
                    content += '<entry><key>%s</key><value>%s</value></entry>\n' % (
                        key, value)
                content += '</Attributes>'
                return make_response(req_action, content=content)
            elif req_action == 'Subscribe':
                if 'Endpoint' not in req_data:
                    return make_error(
                        message='Endpoint not specified in subscription',
                        code=400)
            elif req_action == 'Unsubscribe':
                if 'SubscriptionArn' not in req_data:
                    return make_error(
                        message=
                        'SubscriptionArn not specified in unsubscribe request',
                        code=400)
                do_unsubscribe(req_data.get('SubscriptionArn')[0])
            elif req_action == 'DeleteTopic':
                do_delete_topic(topic_arn)
            elif req_action == 'Publish':
                publish_message(topic_arn, req_data)
                # return response here because we do not want the request to be forwarded to SNS backend
                return make_response(req_action)

        return True
Esempio n. 2
0
    def forward_request(self, method, path, data, headers):
        if method == 'OPTIONS':
            return 200

        # check region
        try:
            aws_stack.check_valid_region(headers)
            aws_stack.set_default_region_in_headers(headers)
        except Exception as e:
            return make_error(message=str(e), code=400)

        if method == 'POST' and path == '/':
            # parse payload and extract fields
            req_data = urlparse.parse_qs(to_str(data), keep_blank_values=True)
            req_action = req_data['Action'][0]
            topic_arn = req_data.get('TargetArn') or req_data.get('TopicArn') or req_data.get('ResourceArn')

            if topic_arn:
                topic_arn = topic_arn[0]
                topic_arn = aws_stack.fix_account_id_in_arns(topic_arn)

            if req_action == 'SetSubscriptionAttributes':
                sub = get_subscription_by_arn(req_data['SubscriptionArn'][0])
                if not sub:
                    return make_error(message='Unable to find subscription for given ARN', code=400)

                attr_name = req_data['AttributeName'][0]
                attr_value = req_data['AttributeValue'][0]
                sub[attr_name] = attr_value
                return make_response(req_action)

            elif req_action == 'GetSubscriptionAttributes':
                sub = get_subscription_by_arn(req_data['SubscriptionArn'][0])
                if not sub:
                    return make_error(message='Unable to find subscription for given ARN', code=400)

                content = '<Attributes>'
                for key, value in sub.items():
                    content += '<entry><key>%s</key><value>%s</value></entry>\n' % (key, value)
                content += '</Attributes>'
                return make_response(req_action, content=content)

            elif req_action == 'Subscribe':
                if 'Endpoint' not in req_data:
                    return make_error(message='Endpoint not specified in subscription', code=400)

            elif req_action == 'ConfirmSubscription':
                if 'TopicArn' not in req_data:
                    return make_error(message='TopicArn not specified in confirm subscription request', code=400)

                if 'Token' not in req_data:
                    return make_error(message='Token not specified in confirm subscription request', code=400)

                do_confirm_subscription(req_data.get('TopicArn')[0], req_data.get('Token')[0])

            elif req_action == 'Unsubscribe':
                if 'SubscriptionArn' not in req_data:
                    return make_error(message='SubscriptionArn not specified in unsubscribe request', code=400)

                do_unsubscribe(req_data.get('SubscriptionArn')[0])

            elif req_action == 'DeleteTopic':
                do_delete_topic(topic_arn)

            elif req_action == 'Publish':
                if req_data.get('Subject') == ['']:
                    return make_error(code=400, code_string='InvalidParameter', message='Subject')

                # No need to create a topic to send SMS or single push notifications with SNS
                # but we can't mock a sending so we only return that it went well
                if 'PhoneNumber' not in req_data and 'TargetArn' not in req_data:
                    if topic_arn not in SNS_SUBSCRIPTIONS.keys():
                        return make_error(code=404, code_string='NotFound', message='Topic does not exist')

                publish_message(topic_arn, req_data)

                # return response here because we do not want the request to be forwarded to SNS backend
                return make_response(req_action)

            elif req_action == 'ListTagsForResource':
                tags = do_list_tags_for_resource(topic_arn)
                content = '<Tags/>'
                if len(tags) > 0:
                    content = '<Tags>'
                    for tag in tags:
                        content += '<member>'
                        content += '<Key>%s</Key>' % tag['Key']
                        content += '<Value>%s</Value>' % tag['Value']
                        content += '</member>'
                    content += '</Tags>'
                return make_response(req_action, content=content)

            elif req_action == 'CreateTopic':
                topic_arn = aws_stack.sns_topic_arn(req_data['Name'][0])
                tag_resource_success = self._extract_tags(topic_arn, req_data, True)
                # in case if there is an error it returns an error , other wise it will continue as expected.
                if not tag_resource_success:
                    return make_error(code=400, code_string='InvalidParameter',
                                  message='Topic already exists with different tags')

            elif req_action == 'TagResource':
                self._extract_tags(topic_arn, req_data, False)
                return make_response(req_action)

            elif req_action == 'UntagResource':
                tags_to_remove = []
                req_tags = {k: v for k, v in req_data.items() if k.startswith('TagKeys.member.')}
                req_tags = req_tags.values()
                for tag in req_tags:
                    tags_to_remove.append(tag[0])
                do_untag_resource(topic_arn, tags_to_remove)
                return make_response(req_action)

            data = self._reset_account_id(data)
            return Request(data=data, headers=headers, method=method)

        return True
Esempio n. 3
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    def forward_request(self, method, path, data, headers):
        if method == "OPTIONS":
            return 200

        # check region
        try:
            aws_stack.check_valid_region(headers)
            aws_stack.set_default_region_in_headers(headers)
        except Exception as e:
            return make_error(message=str(e), code=400)

        if method == "POST":
            # parse payload and extract fields
            req_data = parse_qs(to_str(data), keep_blank_values=True)

            # parse data from query path
            if not req_data:
                parsed_path = urlparse(path)
                req_data = parse_qs(parsed_path.query, keep_blank_values=True)

            req_action = req_data["Action"][0]
            topic_arn = (req_data.get("TargetArn") or req_data.get("TopicArn")
                         or req_data.get("ResourceArn"))
            if topic_arn:
                topic_arn = topic_arn[0]
                topic_arn = aws_stack.fix_account_id_in_arns(topic_arn)
            if req_action == "SetSubscriptionAttributes":
                sub = get_subscription_by_arn(req_data["SubscriptionArn"][0])
                if not sub:
                    return make_error(
                        message="Unable to find subscription for given ARN",
                        code=400)

                attr_name = req_data["AttributeName"][0]
                attr_value = req_data["AttributeValue"][0]
                sub[attr_name] = attr_value
                return make_response(req_action)

            elif req_action == "GetSubscriptionAttributes":
                sub = get_subscription_by_arn(req_data["SubscriptionArn"][0])
                if not sub:
                    return make_error(
                        message="Subscription with arn {0} not found".format(
                            req_data["SubscriptionArn"][0]),
                        code=404,
                        code_string="NotFound",
                    )

                content = "<Attributes>"
                for key, value in sub.items():
                    if key in HTTP_SUBSCRIPTION_ATTRIBUTES:
                        continue
                    content += "<entry><key>%s</key><value>%s</value></entry>\n" % (
                        key,
                        value,
                    )
                content += "</Attributes>"
                return make_response(req_action, content=content)

            elif req_action == "Subscribe":
                if "Endpoint" not in req_data:
                    return make_error(
                        message="Endpoint not specified in subscription",
                        code=400)

                if req_data["Protocol"][0] not in SNS_PROTOCOLS:
                    return make_error(
                        message=
                        f"Invalid parameter: Amazon SNS does not support this protocol string: "
                        f"{req_data['Protocol'][0]}",
                        code=400,
                    )

                if ".fifo" in req_data["Endpoint"][
                        0] and ".fifo" not in topic_arn:
                    return make_error(
                        message=
                        "FIFO SQS Queues can not be subscribed to standard SNS topics",
                        code=400,
                        code_string="InvalidParameter",
                    )

            elif req_action == "ConfirmSubscription":
                if "TopicArn" not in req_data:
                    return make_error(
                        message=
                        "TopicArn not specified in confirm subscription request",
                        code=400,
                    )

                if "Token" not in req_data:
                    return make_error(
                        message=
                        "Token not specified in confirm subscription request",
                        code=400,
                    )

                do_confirm_subscription(
                    req_data.get("TopicArn")[0],
                    req_data.get("Token")[0])

            elif req_action == "Unsubscribe":
                if "SubscriptionArn" not in req_data:
                    return make_error(
                        message=
                        "SubscriptionArn not specified in unsubscribe request",
                        code=400,
                    )

                do_unsubscribe(req_data.get("SubscriptionArn")[0])

            elif req_action == "DeleteTopic":
                do_delete_topic(topic_arn)

            elif req_action == "Publish":
                if req_data.get("Subject") == [""]:
                    return make_error(code=400,
                                      code_string="InvalidParameter",
                                      message="Subject")
                if not req_data.get("Message") or all(
                        not message for message in req_data.get("Message")):
                    return make_error(code=400,
                                      code_string="InvalidParameter",
                                      message="Empty message")

                if topic_arn and ".fifo" in topic_arn and not req_data.get(
                        "MessageGroupId"):
                    return make_error(
                        code=400,
                        code_string="InvalidParameter",
                        message=
                        "The MessageGroupId parameter is required for FIFO topics",
                    )

                sns_backend = SNSBackend.get()
                # No need to create a topic to send SMS or single push notifications with SNS
                # but we can't mock a sending so we only return that it went well
                if "PhoneNumber" not in req_data and "TargetArn" not in req_data:
                    if topic_arn not in sns_backend.sns_subscriptions:
                        return make_error(
                            code=404,
                            code_string="NotFound",
                            message="Topic does not exist",
                        )

                message_id = publish_message(topic_arn, req_data, headers)

                # return response here because we do not want the request to be forwarded to SNS backend
                return make_response(req_action, message_id=message_id)

            elif req_action == "PublishBatch":
                entries = parse_urlencoded_data(
                    req_data, "PublishBatchRequestEntries.member",
                    "MessageAttributes.entry")

                if len(entries) > 10:
                    return make_error(
                        message=
                        "The batch request contains more entries than permissible",
                        code=400,
                        code_string="TooManyEntriesInBatchRequest",
                    )
                ids = [entry["Id"] for entry in entries]

                if len(set(ids)) != len(entries):
                    return make_error(
                        message=
                        "Two or more batch entries in the request have the same Id",
                        code=400,
                        code_string="BatchEntryIdsNotDistinct",
                    )

                if topic_arn and ".fifo" in topic_arn:
                    if not all(
                        ["MessageGroupId" in entry for entry in entries]):
                        return make_error(
                            message=
                            "The MessageGroupId parameter is required for FIFO topics",
                            code=400,
                            code_string="InvalidParameter",
                        )

                response = publish_batch(topic_arn, entries, headers)
                return requests_response_xml(
                    req_action,
                    response,
                    xmlns="http://sns.amazonaws.com/doc/2010-03-31/")

            elif req_action == "ListTagsForResource":
                tags = do_list_tags_for_resource(topic_arn)
                content = "<Tags/>"
                if len(tags) > 0:
                    content = "<Tags>"
                    for tag in tags:
                        content += "<member>"
                        content += "<Key>%s</Key>" % tag["Key"]
                        content += "<Value>%s</Value>" % tag["Value"]
                        content += "</member>"
                    content += "</Tags>"
                return make_response(req_action, content=content)

            elif req_action == "CreateTopic":
                sns_backend = SNSBackend.get()
                topic_arn = aws_stack.sns_topic_arn(req_data["Name"][0])
                tag_resource_success = self._extract_tags(
                    topic_arn, req_data, True, sns_backend)
                sns_backend.sns_subscriptions[topic_arn] = (
                    sns_backend.sns_subscriptions.get(topic_arn) or [])
                # in case if there is an error it returns an error , other wise it will continue as expected.
                if not tag_resource_success:
                    return make_error(
                        code=400,
                        code_string="InvalidParameter",
                        message="Topic already exists with different tags",
                    )

            elif req_action == "TagResource":
                sns_backend = SNSBackend.get()
                self._extract_tags(topic_arn, req_data, False, sns_backend)
                return make_response(req_action)

            elif req_action == "UntagResource":
                tags_to_remove = []
                req_tags = {
                    k: v
                    for k, v in req_data.items()
                    if k.startswith("TagKeys.member.")
                }
                req_tags = req_tags.values()
                for tag in req_tags:
                    tags_to_remove.append(tag[0])
                do_untag_resource(topic_arn, tags_to_remove)
                return make_response(req_action)

            data = self._reset_account_id(data)
            return Request(data=data, headers=headers, method=method)

        return True
Esempio n. 4
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    def forward_request(self, method, path, data, headers):

        # check region
        try:
            aws_stack.check_valid_region(headers)
        except Exception as e:
            return make_error(message=str(e), code=400)

        if method == 'POST' and path == '/':
            req_data = urlparse.parse_qs(to_str(data))
            req_action = req_data['Action'][0]
            topic_arn = req_data.get('TargetArn') or req_data.get('TopicArn')

            if topic_arn:
                topic_arn = topic_arn[0]
                do_create_topic(topic_arn)

            if req_action == 'SetSubscriptionAttributes':
                sub = get_subscription_by_arn(req_data['SubscriptionArn'][0])
                if not sub:
                    return make_error(message='Unable to find subscription for given ARN', code=400)
                attr_name = req_data['AttributeName'][0]
                attr_value = req_data['AttributeValue'][0]
                sub[attr_name] = attr_value
                return make_response(req_action)
            elif req_action == 'GetSubscriptionAttributes':
                sub = get_subscription_by_arn(req_data['SubscriptionArn'][0])
                if not sub:
                    return make_error(message='Unable to find subscription for given ARN', code=400)
                content = '<Attributes>'
                for key, value in sub.items():
                    content += '<entry><key>%s</key><value>%s</value></entry>\n' % (key, value)
                content += '</Attributes>'
                return make_response(req_action, content=content)
            elif req_action == 'Subscribe':
                if 'Endpoint' not in req_data:
                    return make_error(message='Endpoint not specified in subscription', code=400)
            elif req_action == 'Unsubscribe':
                if 'SubscriptionArn' not in req_data:
                    return make_error(message='SubscriptionArn not specified in unsubscribe request', code=400)
                do_unsubscribe(req_data.get('SubscriptionArn')[0])

            elif req_action == 'Publish':
                message = req_data['Message'][0]
                sqs_client = aws_stack.connect_to_service('sqs')
                for subscriber in SNS_SUBSCRIPTIONS[topic_arn]:
                    filter_policy = json.loads(subscriber.get('FilterPolicy', '{}'))
                    message_attributes = get_message_attributes(req_data)
                    if check_filter_policy(filter_policy, message_attributes):
                        if subscriber['Protocol'] == 'sqs':
                            endpoint = subscriber['Endpoint']
                            if 'sqs_queue_url' in subscriber:
                                queue_url = subscriber.get('sqs_queue_url')
                            elif '://' in endpoint:
                                queue_url = endpoint
                            else:
                                queue_name = endpoint.split(':')[5]
                                queue_url = aws_stack.get_sqs_queue_url(queue_name)
                                subscriber['sqs_queue_url'] = queue_url
                            try:
                                sqs_client.send_message(
                                    QueueUrl=queue_url,
                                    MessageBody=create_sns_message_body(subscriber, req_data)
                                )
                            except Exception as exc:
                                return make_error(message=str(exc), code=400)
                        elif subscriber['Protocol'] == 'lambda':
                            lambda_api.process_sns_notification(
                                subscriber['Endpoint'],
                                topic_arn, message, subject=req_data.get('Subject', [None])[0]
                            )
                        elif subscriber['Protocol'] in ['http', 'https']:
                            try:
                                message_body = create_sns_message_body(subscriber, req_data)
                            except Exception as exc:
                                return make_error(message=str(exc), code=400)
                            requests.post(
                                subscriber['Endpoint'],
                                headers={
                                    'Content-Type': 'text/plain',
                                    'x-amz-sns-message-type': 'Notification'
                                },
                                data=message_body
                            )
                        else:
                            LOGGER.warning('Unexpected protocol "%s" for SNS subscription' % subscriber['Protocol'])
                # return response here because we do not want the request to be forwarded to SNS
                return make_response(req_action)

        return True
Esempio n. 5
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    def forward_request(self, method, path, data, headers):

        if method == 'OPTIONS':
            return 200

        # check region
        try:
            aws_stack.check_valid_region(headers)
        except Exception as e:
            return make_error(message=str(e), code=400)

        if method == 'POST' and path == '/':

            # parse payload and extract fields
            req_data = urlparse.parse_qs(to_str(data))
            req_action = req_data['Action'][0]
            topic_arn = req_data.get('TargetArn') or req_data.get('TopicArn')

            if topic_arn:
                topic_arn = topic_arn[0]
                topic_arn = aws_stack.fix_account_id_in_arns(topic_arn)

            if req_action == 'SetSubscriptionAttributes':
                sub = get_subscription_by_arn(req_data['SubscriptionArn'][0])
                if not sub:
                    return make_error(message='Unable to find subscription for given ARN', code=400)
                attr_name = req_data['AttributeName'][0]
                attr_value = req_data['AttributeValue'][0]
                sub[attr_name] = attr_value
                return make_response(req_action)
            elif req_action == 'GetSubscriptionAttributes':
                sub = get_subscription_by_arn(req_data['SubscriptionArn'][0])
                if not sub:
                    return make_error(message='Unable to find subscription for given ARN', code=400)
                content = '<Attributes>'
                for key, value in sub.items():
                    content += '<entry><key>%s</key><value>%s</value></entry>\n' % (key, value)
                content += '</Attributes>'
                return make_response(req_action, content=content)
            elif req_action == 'Subscribe':
                if 'Endpoint' not in req_data:
                    return make_error(message='Endpoint not specified in subscription', code=400)
            elif req_action == 'Unsubscribe':
                if 'SubscriptionArn' not in req_data:
                    return make_error(message='SubscriptionArn not specified in unsubscribe request', code=400)
                do_unsubscribe(req_data.get('SubscriptionArn')[0])
            elif req_action == 'DeleteTopic':
                do_delete_topic(topic_arn)
            elif req_action == 'Publish':
                # No need to create a topic to send SMS with SNS
                # but we can't mock a sending so we only return that it went well
                if 'PhoneNumber' not in req_data:
                    if topic_arn not in SNS_SUBSCRIPTIONS.keys():
                        return make_error(code=404, code_string='NotFound', message='Topic does not exist')
                    publish_message(topic_arn, req_data)
                # return response here because we do not want the request to be forwarded to SNS backend
                return make_response(req_action)
            elif req_action == 'ListTagsForResource':
                tags = do_list_tags_for_resource(topic_arn)
                content = '<Tags/>'
                if len(tags) > 0:
                    content = '<Tags>'
                    for tag in tags:
                        content += '<member>'
                        content += '<Key>%s</Key>' % tag['Key']
                        content += '<Value>%s</Value>' % tag['Value']
                        content += '</member>'
                    content += '</Tags>'
                return make_response(req_action, content=content)
            elif req_action == 'TagResource':
                tags = []
                req_tags = {k: v for k, v in req_data.items() if k.startswith('Tags.member.')}
                for i in range(int(len(req_tags.keys()) / 2)):
                    key = req_tags['Tags.member.' + str(i + 1) + '.Key'][0]
                    value = req_tags['Tags.member.' + str(i + 1) + '.Value'][0]
                    tags.append({'Key': key, 'Value': value})
                do_tag_resource(topic_arn, tags)
                return make_response(req_action)
            elif req_action == 'UntagResource':
                tags_to_remove = []
                req_tags = {k: v for k, v in req_data.items() if k.startswith('TagKeys.member.')}
                req_tags = req_tags.values()
                for tag in req_tags:
                    tags_to_remove.append(tag[0])
                do_untag_resource(topic_arn, tags_to_remove)
                return make_response(req_action)

            data = self._reset_account_id(data)
            return Request(data=data, headers=headers, method=method)

        return True
Esempio n. 6
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    def forward_request(self, method, path, data, headers):

        # check region
        try:
            aws_stack.check_valid_region(headers)
        except Exception as e:
            return make_error(message=str(e), code=400)

        if method == 'POST' and path == '/':

            # parse payload and extract fields
            req_data = urlparse.parse_qs(to_str(data))
            req_action = req_data['Action'][0]
            topic_arn = req_data.get('TargetArn') or req_data.get('TopicArn')

            if topic_arn:
                topic_arn = topic_arn[0]
                topic_arn = aws_stack.fix_account_id_in_arns(topic_arn)

            if req_action == 'SetSubscriptionAttributes':
                sub = get_subscription_by_arn(req_data['SubscriptionArn'][0])
                if not sub:
                    return make_error(
                        message='Unable to find subscription for given ARN',
                        code=400)
                attr_name = req_data['AttributeName'][0]
                attr_value = req_data['AttributeValue'][0]
                sub[attr_name] = attr_value
                return make_response(req_action)
            elif req_action == 'GetSubscriptionAttributes':
                sub = get_subscription_by_arn(req_data['SubscriptionArn'][0])
                if not sub:
                    return make_error(
                        message='Unable to find subscription for given ARN',
                        code=400)
                content = '<Attributes>'
                for key, value in sub.items():
                    content += '<entry><key>%s</key><value>%s</value></entry>\n' % (
                        key, value)
                content += '</Attributes>'
                return make_response(req_action, content=content)
            elif req_action == 'Subscribe':
                if 'Endpoint' not in req_data:
                    return make_error(
                        message='Endpoint not specified in subscription',
                        code=400)
            elif req_action == 'Unsubscribe':
                if 'SubscriptionArn' not in req_data:
                    return make_error(
                        message=
                        'SubscriptionArn not specified in unsubscribe request',
                        code=400)
                do_unsubscribe(req_data.get('SubscriptionArn')[0])
            elif req_action == 'DeleteTopic':
                do_delete_topic(topic_arn)
            elif req_action == 'Publish':
                # No need to create a topic to send SMS with SNS
                # but we can't mock a sending so we only return that it went well
                if 'PhoneNumber' not in req_data:
                    if topic_arn not in SNS_SUBSCRIPTIONS.keys():
                        return make_error(code=404,
                                          code_string='NotFound',
                                          message='Topic does not exist')
                    publish_message(topic_arn, req_data)
                # return response here because we do not want the request to be forwarded to SNS backend
                return make_response(req_action)

            data = self._reset_account_id(data)
            return Request(data=data, headers=headers, method=method)

        return True
Esempio n. 7
0
    def forward_request(self, method, path, data, headers):
        if method == "OPTIONS":
            return 200

        # check region
        try:
            aws_stack.check_valid_region(headers)
            aws_stack.set_default_region_in_headers(headers)
        except Exception as e:
            return make_error(message=str(e), code=400)

        if method == "POST":
            # parse payload and extract fields
            req_data = urlparse.parse_qs(to_str(data), keep_blank_values=True)

            # parse data from query path
            if not req_data:
                parsed_path = urlparse.urlparse(path)
                req_data = urlparse.parse_qs(parsed_path.query,
                                             keep_blank_values=True)

            req_action = req_data["Action"][0]
            topic_arn = (req_data.get("TargetArn") or req_data.get("TopicArn")
                         or req_data.get("ResourceArn"))
            if topic_arn:
                topic_arn = topic_arn[0]
                topic_arn = aws_stack.fix_account_id_in_arns(topic_arn)
            if req_action == "SetSubscriptionAttributes":
                sub = get_subscription_by_arn(req_data["SubscriptionArn"][0])
                if not sub:
                    return make_error(
                        message="Unable to find subscription for given ARN",
                        code=400)

                attr_name = req_data["AttributeName"][0]
                attr_value = req_data["AttributeValue"][0]
                sub[attr_name] = attr_value
                return make_response(req_action)

            elif req_action == "GetSubscriptionAttributes":
                sub = get_subscription_by_arn(req_data["SubscriptionArn"][0])
                if not sub:
                    return make_error(
                        message="Subscription with arn {0} not found".format(
                            req_data["SubscriptionArn"][0]),
                        code=404,
                        code_string="NotFound",
                    )

                content = "<Attributes>"
                for key, value in sub.items():
                    if key in HTTP_SUBSCRIPTION_ATTRIBUTES:
                        continue
                    content += "<entry><key>%s</key><value>%s</value></entry>\n" % (
                        key,
                        value,
                    )
                content += "</Attributes>"
                return make_response(req_action, content=content)

            elif req_action == "Subscribe":
                if "Endpoint" not in req_data:
                    return make_error(
                        message="Endpoint not specified in subscription",
                        code=400)

            elif req_action == "ConfirmSubscription":
                if "TopicArn" not in req_data:
                    return make_error(
                        message=
                        "TopicArn not specified in confirm subscription request",
                        code=400,
                    )

                if "Token" not in req_data:
                    return make_error(
                        message=
                        "Token not specified in confirm subscription request",
                        code=400,
                    )

                do_confirm_subscription(
                    req_data.get("TopicArn")[0],
                    req_data.get("Token")[0])

            elif req_action == "Unsubscribe":
                if "SubscriptionArn" not in req_data:
                    return make_error(
                        message=
                        "SubscriptionArn not specified in unsubscribe request",
                        code=400,
                    )

                do_unsubscribe(req_data.get("SubscriptionArn")[0])

            elif req_action == "DeleteTopic":
                do_delete_topic(topic_arn)

            elif req_action == "Publish":
                if req_data.get("Subject") == [""]:
                    return make_error(code=400,
                                      code_string="InvalidParameter",
                                      message="Subject")
                sns_backend = SNSBackend.get()
                # No need to create a topic to send SMS or single push notifications with SNS
                # but we can't mock a sending so we only return that it went well
                if "PhoneNumber" not in req_data and "TargetArn" not in req_data:
                    if topic_arn not in sns_backend.sns_subscriptions:
                        return make_error(
                            code=404,
                            code_string="NotFound",
                            message="Topic does not exist",
                        )

                message_id = publish_message(topic_arn, req_data, headers)

                # return response here because we do not want the request to be forwarded to SNS backend
                return make_response(req_action, message_id=message_id)

            elif req_action == "ListTagsForResource":
                tags = do_list_tags_for_resource(topic_arn)
                content = "<Tags/>"
                if len(tags) > 0:
                    content = "<Tags>"
                    for tag in tags:
                        content += "<member>"
                        content += "<Key>%s</Key>" % tag["Key"]
                        content += "<Value>%s</Value>" % tag["Value"]
                        content += "</member>"
                    content += "</Tags>"
                return make_response(req_action, content=content)

            elif req_action == "CreateTopic":
                sns_backend = SNSBackend.get()
                topic_arn = aws_stack.sns_topic_arn(req_data["Name"][0])
                tag_resource_success = self._extract_tags(
                    topic_arn, req_data, True, sns_backend)
                sns_backend.sns_subscriptions[topic_arn] = (
                    sns_backend.sns_subscriptions.get(topic_arn) or [])
                # in case if there is an error it returns an error , other wise it will continue as expected.
                if not tag_resource_success:
                    return make_error(
                        code=400,
                        code_string="InvalidParameter",
                        message="Topic already exists with different tags",
                    )

            elif req_action == "TagResource":
                sns_backend = SNSBackend.get()
                self._extract_tags(topic_arn, req_data, False, sns_backend)
                return make_response(req_action)

            elif req_action == "UntagResource":
                tags_to_remove = []
                req_tags = {
                    k: v
                    for k, v in req_data.items()
                    if k.startswith("TagKeys.member.")
                }
                req_tags = req_tags.values()
                for tag in req_tags:
                    tags_to_remove.append(tag[0])
                do_untag_resource(topic_arn, tags_to_remove)
                return make_response(req_action)

            data = self._reset_account_id(data)
            return Request(data=data, headers=headers, method=method)

        return True