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How to use convert_s3_to_local_url method in localstack

Best Python code snippet using localstack_python

template_preparer.py

Source:template_preparer.py

...46                os.environ["AWS_DEFAULT_REGION"] = region_before47def prepare_template_body(req_data) -> Optional[str]:  # TODO: mutating and returning48    template_url = req_data.get("TemplateURL")49    if template_url:50        req_data["TemplateURL"] = convert_s3_to_local_url(template_url)51    url = req_data.get("TemplateURL", "")52    if is_local_service_url(url):53        modified_template_body = get_template_body(req_data)54        if modified_template_body:55            req_data.pop("TemplateURL", None)56            req_data["TemplateBody"] = modified_template_body57    modified_template_body = transform_template(req_data)58    if modified_template_body:59        req_data["TemplateBody"] = modified_template_body60    return modified_template_body61def validate_template(req_data):62    # TODO implement actual validation logic63    # Note: if we enable this via moto, ensure that we have cfnlint module available (adds ~58MB in size :/)64    response_content = """65        <Capabilities></Capabilities>66        <CapabilitiesReason></CapabilitiesReason>67        <DeclaredTransforms></DeclaredTransforms>68        <Description>{description}</Description>69        <Parameters>70            {parameters}71        </Parameters>72    """73    template_body = get_template_body(req_data)74    valid_template = json.loads(template_to_json(template_body))75    parameters = "".join(76        [77            """78        <member>79            <ParameterKey>{pk}</ParameterKey>80            <DefaultValue>{dv}</DefaultValue>81            <NoEcho>{echo}</NoEcho>82            <Description>{desc}</Description>83        </member>84        """.format(85                pk=k, dv=v.get("Default", ""), echo=False, desc=v.get("Description", "")86            )87            for k, v in valid_template.get("Parameters", {}).items()88        ]89    )90    resp = response_content.format(91        parameters=parameters, description=valid_template.get("Description", "")92    )93    return resp94def get_template_body(req_data):95    body = req_data.get("TemplateBody")96    if body:97        return body98    url = req_data.get("TemplateURL")99    if url:100        response = run_safe(lambda: safe_requests.get(url, verify=False))101        # check error codes, and code 301 - fixes https://github.com/localstack/localstack/issues/1884102        status_code = 0 if response is None else response.status_code103        if response is None or status_code == 301 or status_code >= 400:104            # check if this is an S3 URL, then get the file directly from there105            url = convert_s3_to_local_url(url)106            if is_local_service_url(url):107                parsed_path = urlparse(url).path.lstrip("/")108                parts = parsed_path.partition("/")109                client = aws_stack.connect_to_service("s3")110                LOG.debug(111                    "Download CloudFormation template content from local S3: %s - %s",112                    parts[0],113                    parts[2],114                )115                result = client.get_object(Bucket=parts[0], Key=parts[2])116                body = to_str(result["Body"].read())117                return body118            raise Exception(119                "Unable to fetch template body (code %s) from URL %s" % (status_code, url)120            )121        return response.content122    raise Exception("Unable to get template body from input: %s" % req_data)123def parse_template(template):124    try:125        return json.loads(template)126    except Exception:127        yaml.add_multi_constructor(128            "", moto.cloudformation.utils.yaml_tag_constructor, Loader=NoDatesSafeLoader129        )  # TODO: remove moto dependency here130        try:131            return clone_safe(yaml.safe_load(template))132        except Exception:133            try:134                return clone_safe(yaml.load(template, Loader=NoDatesSafeLoader))135            except Exception as e:136                LOG.debug("Unable to parse CloudFormation template (%s): %s", e, template)137                raise138def template_to_json(template):139    template = parse_template(template)140    return json.dumps(template)141def is_local_service_url(url):142    if not url:143        return False144    candidates = (145        constants.LOCALHOST,146        constants.LOCALHOST_HOSTNAME,147        config.LOCALSTACK_HOSTNAME,148        config.HOSTNAME_EXTERNAL,149    )150    if any(re.match(r"^[^:]+://[^:/]*%s([:/]|$)" % host, url) for host in candidates):151        return True152    host = url.split("://")[-1].split("/")[0]153    return "localhost" in host154def convert_s3_to_local_url(url):155    url_parsed = urlparse(url)156    path = url_parsed.path157    headers = CaseInsensitiveDict({"Host": url_parsed.netloc})158    bucket_name = s3_utils.extract_bucket_name(headers, path)159    key_name = s3_utils.extract_key_name(headers, path)160    # note: make sure to normalize the bucket name here!161    bucket_name = s3_listener.normalize_bucket_name(bucket_name)162    local_url = f"{config.service_url('s3')}/{bucket_name}/{key_name}"...

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