1 files changed, 78 insertions, 0 deletions
diff --git a/testing/web-platform/tests/fetch/api/resources/preflight.py b/testing/web-platform/tests/fetch/api/resources/preflight.py
new file mode 100644
index 0000000000..f983ef9522
--- /dev/null
+++ b/testing/web-platform/tests/fetch/api/resources/preflight.py
@@ -0,0 +1,78 @@
+def main(request, response):
+    headers = [(b"Content-Type", b"text/plain")]
+    stashed_data = {b'control_request_headers': b"", b'preflight': b"0", b'preflight_referrer': b""}
+
+    token = None
+    if b"token" in request.GET:
+        token = request.GET.first(b"token")
+
+    if b"origin" in request.GET:
+        for origin in request.GET[b'origin'].split(b", "):
+            headers.append((b"Access-Control-Allow-Origin", origin))
+    else:
+        headers.append((b"Access-Control-Allow-Origin", b"*"))
+
+    if b"clear-stash" in request.GET:
+        if request.server.stash.take(token) is not None:
+            return headers, b"1"
+        else:
+            return headers, b"0"
+
+    if b"credentials" in request.GET:
+        headers.append((b"Access-Control-Allow-Credentials", b"true"))
+
+    if request.method == u"OPTIONS":
+        if not b"Access-Control-Request-Method" in request.headers:
+            response.set_error(400, u"No Access-Control-Request-Method header")
+            return b"ERROR: No access-control-request-method in preflight!"
+
+        if request.headers.get(b"Accept", b"") != b"*/*":
+            response.set_error(400, u"Request does not have 'Accept: */*' header")
+            return b"ERROR: Invalid access in preflight!"
+
+        if b"control_request_headers" in request.GET:
+            stashed_data[b'control_request_headers'] = request.headers.get(b"Access-Control-Request-Headers", None)
+
+        if b"max_age" in request.GET:
+            headers.append((b"Access-Control-Max-Age", request.GET[b'max_age']))
+
+        if b"allow_headers" in request.GET:
+            headers.append((b"Access-Control-Allow-Headers", request.GET[b'allow_headers']))
+
+        if b"allow_methods" in request.GET:
+            headers.append((b"Access-Control-Allow-Methods", request.GET[b'allow_methods']))
+
+        preflight_status = 200
+        if b"preflight_status" in request.GET:
+            preflight_status = int(request.GET.first(b"preflight_status"))
+
+        stashed_data[b'preflight'] = b"1"
+        stashed_data[b'preflight_referrer'] = request.headers.get(b"Referer", b"")
+        stashed_data[b'preflight_user_agent'] = request.headers.get(b"User-Agent", b"")
+        if token:
+            request.server.stash.put(token, stashed_data)
+
+        return preflight_status, headers, b""
+
+
+    if token:
+        data = request.server.stash.take(token)
+        if data:
+            stashed_data = data
+
+    if b"checkUserAgentHeaderInPreflight" in request.GET and request.headers.get(b"User-Agent") != stashed_data[b'preflight_user_agent']:
+        return 400, headers, b"ERROR: No user-agent header in preflight"
+
+    #use x-* headers for returning value to bodyless responses
+    headers.append((b"Access-Control-Expose-Headers", b"x-did-preflight, x-control-request-headers, x-referrer, x-preflight-referrer, x-origin"))
+    headers.append((b"x-did-preflight", stashed_data[b'preflight']))
+    if stashed_data[b'control_request_headers'] != None:
+        headers.append((b"x-control-request-headers", stashed_data[b'control_request_headers']))
+    headers.append((b"x-preflight-referrer", stashed_data[b'preflight_referrer']))
+    headers.append((b"x-referrer", request.headers.get(b"Referer", b"")))
+    headers.append((b"x-origin", request.headers.get(b"Origin", b"")))
+
+    if token:
+        request.server.stash.put(token, stashed_data)
+
+    return headers, b""