How to use _post_process_response_headers method in localstack

Best Python code snippet using localstack_python

generic_proxy.py

Source:generic_proxy.py

...238            status_code=response.status_code,239            content=self._adjust_partition(response.content),240            headers=self._adjust_partition(response.headers),241        )242        self._post_process_response_headers(response)243        return response244    def _adjust_partition_in_path(self, path: str, static_partition: str = None):245        """Adjusts the (still url encoded) URL path"""246        parsed_url = urlparse(path)247        # Make sure to keep blank values, otherwise we drop query params which do not have a248        # value (f.e. "/?policy")249        decoded_query = parse_qs(qs=parsed_url.query, keep_blank_values=True)250        adjusted_path = self._adjust_partition(parsed_url.path, static_partition)251        adjusted_query = self._adjust_partition(decoded_query, static_partition)252        encoded_query = urlencode(adjusted_query, doseq=True)253        # Make sure to avoid empty equals signs (in between and in the end)254        encoded_query = encoded_query.replace("=&", "&")255        encoded_query = re.sub(r"=$", "", encoded_query)256        return f"{adjusted_path}{('?' + encoded_query) if encoded_query else ''}"257    def _adjust_partition(self, source, static_partition: str = None):258        # Call this function recursively if we get a dictionary or a list259        if isinstance(source, dict):260            result = {}261            for k, v in source.items():262                result[k] = self._adjust_partition(v, static_partition)263            return result264        if isinstance(source, list):265            result = []266            for v in source:267                result.append(self._adjust_partition(v, static_partition))268            return result269        elif isinstance(source, bytes):270            try:271                decoded = unquote(to_str(source))272                adjusted = self._adjust_partition(decoded, static_partition)273                return to_bytes(adjusted)274            except UnicodeDecodeError:275                # If the body can't be decoded to a string, we return the initial source276                return source277        elif not isinstance(source, str):278            # Ignore any other types279            return source280        return self.arn_regex.sub(lambda m: self._adjust_match(m, static_partition), source)281    def _adjust_match(self, match: Match, static_partition: str = None):282        region = match.group("Region")283        partition = self._partition_lookup(region) if static_partition is None else static_partition284        service = match.group("Service")285        account_id = match.group("AccountID")286        resource_path = match.group("ResourcePath")287        return f"arn:{partition}:{service}:{region}:{account_id}:{resource_path}"288    def _partition_lookup(self, region: str):289        try:290            partition = self._get_partition_for_region(region)291        except ArnPartitionRewriteListener.InvalidRegionException:292            try:293                # If the region is not properly set (f.e. because it is set to a wildcard),294                # the partition is determined based on the default region.295                partition = self._get_partition_for_region(config.DEFAULT_REGION)296            except self.InvalidRegionException:297                # If it also fails with the DEFAULT_REGION, we use us-east-1 as a fallback298                partition = self._get_partition_for_region(AWS_REGION_US_EAST_1)299        return partition300    @staticmethod301    def _get_partition_for_region(region: Optional[str]) -> str:302        # Region-Partition matching is based on the "regionRegex" definitions in the endpoints.json303        # in the botocore package.304        if region and region.startswith("us-gov-"):305            return "aws-us-gov"306        elif region and region.startswith("us-iso-"):307            return "aws-iso"308        elif region and region.startswith("us-isob-"):309            return "aws-iso-b"310        elif region and region.startswith("cn-"):311            return "aws-cn"312        elif region and re.match(r"^(us|eu|ap|sa|ca|me|af)-\w+-\d+$", region):313            return "aws"314        else:315            raise ArnPartitionRewriteListener.InvalidRegionException(316                f"Region ({region}) could not be matched to a partition."317            )318    @staticmethod319    def _post_process_response_headers(response: RoutingResponse) -> None:320        """Adjust potential content lengths and checksums after modifying the response."""321        if response.headers and response.content:322            if "Content-Length" in response.headers:323                response.headers["Content-Length"] = str(len(to_bytes(response.content)))324            if "x-amz-crc32" in response.headers:325                response.headers["x-amz-crc32"] = calculate_crc32(response.content)326# -------------------327# BASE BACKEND UTILS328# -------------------329T = TypeVar("T", bound="RegionBackend")330class RegionBackend:331    """Base class for provider backends. RegionBackend lookup methods are not thread safe.332    RegionBackend transparently performs namespacing per AWS account IDs.333    Usage...

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