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# This endpoint responds to requests for a target of a (possible) LNA request.
#
# Its behavior can be configured with various search/GET parameters, all of
# which are optional:
#
# - final-headers: Valid values are:
# - cors: this endpoint responds with valid CORS headers to CORS-enabled
# non-preflight requests. These should be sufficient for non-preflighted
# CORS-enabled requests to succeed.
# - sw: this endpoint responds with a valid Service-Worker header to allow
# for the request to serve as a Service worker script resource. This is
# only valid in conjunction with the cors value above.
# - unspecified: this endpoint responds with no CORS headers to non-preflight
# requests. This should fail CORS-enabled requests, but be sufficient for
# no-CORS requests.
#
# The following parameters only affect non-preflight responses:
#
# - redirect: If set, the response code is set to 301 and the `Location`
# response header is set to this value.
# - mime-type: If set, the `Content-Type` response header is set to this value.
# - file: Specifies a path (relative to this file's directory) to a file. If
# set, the response body is copied from this file.
# - random-js-prefix: If set to any value, the response body is prefixed with
# a Javascript comment line containing a random value. This is useful in
# service worker tests, since service workers are only updated if the new
# script is not byte-for-byte identical with the old script.
# - body: If set and `file` is not, the response body is set to this value.
#
import os
import random
from wptserve.utils import isomorphic_encode
_ACAO = ("Access-Control-Allow-Origin", "*")
_ACAH = ("Access-Control-Allow-Headers", "Service-Worker")
def _get_response_headers(method, mode, origin):
acam = ("Access-Control-Allow-Methods", method)
if mode == b"cors":
return [acam, _ACAO]
if mode == b"cors+sw":
return [acam, _ACAO, _ACAH]
if mode == b"navigation":
return [
acam,
("Access-Control-Allow-Origin", origin),
("Access-Control-Allow-Credentials", "true"),
]
return []
def _is_loaded_in_fenced_frame(request):
return request.GET.get(b"is-loaded-in-fenced-frame")
def _final_response_body(request):
file_name = None
if file_name is None:
file_name = request.GET.get(b"file")
if file_name is None:
return request.GET.get(b"body") or "success"
prefix = b""
if request.GET.get(b"random-js-prefix"):
value = random.randint(0, 1000000000)
prefix = isomorphic_encode("// Random value: {}\n\n".format(value))
path = os.path.join(os.path.dirname(isomorphic_encode(__file__)), file_name)
with open(path, 'rb') as f:
contents = f.read()
return prefix + contents
def _handle_final_request(request, response):
mode = request.GET.get(b"final-headers")
origin = request.headers.get("Origin")
headers = _get_response_headers(request.method, mode, origin)
redirect = request.GET.get(b"redirect")
if redirect is not None:
headers.append(("Location", redirect))
return (301, headers, b"")
mime_type = request.GET.get(b"mime-type")
if mime_type is not None:
headers.append(("Content-Type", mime_type),)
if _is_loaded_in_fenced_frame(request):
headers.append(("Supports-Loading-Mode", "fenced-frame"))
body = _final_response_body(request)
return (headers, body)
def main(request, response):
try:
return _handle_final_request(request, response)
except BaseException as e:
# Surface exceptions to the client, where they show up as assertion errors.
return (500, [("X-exception", str(e))], "exception: {}".format(e))