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api_gateway.py
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api_gateway.py
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from typing import Dict, List, Optional, Tuple
from urllib.parse import urlencode
from mangum.handlers.utils import (
get_server_and_port,
handle_base64_response_body,
handle_multi_value_headers,
maybe_encode_body,
strip_api_gateway_path,
)
from mangum.types import (
HTTPResponse,
LambdaConfig,
Headers,
LambdaEvent,
LambdaContext,
LambdaHandler,
QueryParams,
HTTPScope,
)
def _encode_query_string_for_apigw(event: LambdaEvent) -> bytes:
params: QueryParams = event.get("multiValueQueryStringParameters", {})
if not params:
params = event.get("queryStringParameters", {})
if not params:
return b""
return urlencode(params, doseq=True).encode()
def _handle_multi_value_headers_for_request(event: LambdaEvent) -> Dict[str, str]:
headers = event.get("headers", {}) or {}
headers = {k.lower(): v for k, v in headers.items()}
if event.get("multiValueHeaders"):
headers.update(
{
k.lower(): ", ".join(v) if isinstance(v, list) else ""
for k, v in event.get("multiValueHeaders", {}).items()
}
)
return headers
def _combine_headers_v2(
input_headers: Headers,
) -> Tuple[Dict[str, str], List[str]]:
output_headers: Dict[str, str] = {}
cookies: List[str] = []
for key, value in input_headers:
normalized_key: str = key.decode().lower()
normalized_value: str = value.decode()
if normalized_key == "set-cookie":
cookies.append(normalized_value)
else:
if normalized_key in output_headers:
normalized_value = (
f"{output_headers[normalized_key]},{normalized_value}"
)
output_headers[normalized_key] = normalized_value
return output_headers, cookies
class APIGateway:
@classmethod
def infer(
cls, event: LambdaEvent, context: LambdaContext, config: LambdaConfig
) -> Optional[LambdaHandler]:
if "resource" in event and "requestContext" in event:
return cls(event, context, config)
return None
def __init__(
self, event: LambdaEvent, context: LambdaContext, config: LambdaConfig
) -> None:
self.event = event
self.context = context
self.config = config
@property
def body(self) -> bytes:
return maybe_encode_body(
self.event.get("body", b""),
is_base64=self.event.get("isBase64Encoded", False),
)
@property
def scope(self) -> HTTPScope:
headers = _handle_multi_value_headers_for_request(self.event)
return {
"type": "http",
"http_version": "1.1",
"method": self.event["httpMethod"],
"headers": [[k.encode(), v.encode()] for k, v in headers.items()],
"path": strip_api_gateway_path(
self.event["path"],
api_gateway_base_path=self.config["api_gateway_base_path"],
),
"raw_path": None,
"root_path": "",
"scheme": headers.get("x-forwarded-proto", "https"),
"query_string": _encode_query_string_for_apigw(self.event),
"server": get_server_and_port(headers),
"client": (
self.event["requestContext"].get("identity", {}).get("sourceIp"),
0,
),
"asgi": {"version": "3.0", "spec_version": "2.0"},
"aws.event": self.event,
"aws.context": self.context,
}
def __call__(self, response: HTTPResponse) -> dict:
finalized_headers, multi_value_headers = handle_multi_value_headers(
response["headers"]
)
finalized_body, is_base64_encoded = handle_base64_response_body(
response["body"], finalized_headers
)
return {
"statusCode": response["status"],
"headers": finalized_headers,
"multiValueHeaders": multi_value_headers,
"body": finalized_body,
"isBase64Encoded": is_base64_encoded,
}
class HTTPGateway:
@classmethod
def infer(
cls, event: LambdaEvent, context: LambdaContext, config: LambdaConfig
) -> Optional[LambdaHandler]:
if "version" in event and "requestContext" in event:
return cls(event, context, config)
return None
def __init__(
self, event: LambdaEvent, context: LambdaContext, config: LambdaConfig
) -> None:
self.event = event
self.context = context
self.config = config
@property
def body(self) -> bytes:
return maybe_encode_body(
self.event.get("body", b""),
is_base64=self.event.get("isBase64Encoded", False),
)
@property
def scope(self) -> HTTPScope:
request_context = self.event["requestContext"]
event_version = self.event["version"]
# API Gateway v2
if event_version == "2.0":
headers = {k.lower(): v for k, v in self.event.get("headers", {}).items()}
source_ip = request_context["http"]["sourceIp"]
path = request_context["http"]["path"]
http_method = request_context["http"]["method"]
query_string = self.event.get("rawQueryString", "").encode()
if self.event.get("cookies"):
headers["cookie"] = "; ".join(self.event.get("cookies", []))
# API Gateway v1
else:
headers = _handle_multi_value_headers_for_request(self.event)
source_ip = request_context.get("identity", {}).get("sourceIp")
path = self.event["path"]
http_method = self.event["httpMethod"]
query_string = _encode_query_string_for_apigw(self.event)
path = strip_api_gateway_path(
path,
api_gateway_base_path=self.config["api_gateway_base_path"],
)
server = get_server_and_port(headers)
client = (source_ip, 0)
return {
"type": "http",
"method": http_method,
"http_version": "1.1",
"headers": [[k.encode(), v.encode()] for k, v in headers.items()],
"path": path,
"raw_path": None,
"root_path": "",
"scheme": headers.get("x-forwarded-proto", "https"),
"query_string": query_string,
"server": server,
"client": client,
"asgi": {"version": "3.0", "spec_version": "2.0"},
"aws.event": self.event,
"aws.context": self.context,
}
def __call__(self, response: HTTPResponse) -> dict:
if self.scope["aws.event"]["version"] == "2.0":
finalized_headers, cookies = _combine_headers_v2(response["headers"])
if "content-type" not in finalized_headers and response["body"] is not None:
finalized_headers["content-type"] = "application/json"
finalized_body, is_base64_encoded = handle_base64_response_body(
response["body"], finalized_headers
)
response_out = {
"statusCode": response["status"],
"body": finalized_body,
"headers": finalized_headers or None,
"cookies": cookies or None,
"isBase64Encoded": is_base64_encoded,
}
return {
key: value for key, value in response_out.items() if value is not None
}
finalized_headers, multi_value_headers = handle_multi_value_headers(
response["headers"]
)
finalized_body, is_base64_encoded = handle_base64_response_body(
response["body"], finalized_headers
)
return {
"statusCode": response["status"],
"headers": finalized_headers,
"multiValueHeaders": multi_value_headers,
"body": finalized_body,
"isBase64Encoded": is_base64_encoded,
}