"""
Event beacon store server.
- When a request body is specified, stores the data in the body for the 'type'
specified in the query parameters and serves a 200 response without body.
- When a request body is not specified and the request is not served with an
'expected_body' parameter, stores an empty body for the 'type' specified in
the query parameters and serves a 200 response without body.
- When a request body is not specified and the request is served with an
'expected_body' parameter, serves a 200 response whose body contains the
stored value from the automatic beacon. Since the data is stored using a hash
of the data as the key, it uses the `expected_body` query parameter to know
what key to look up. If the stored value doesn't exist, serves a 200 response
with an empty body.
"""
import uuid
import hashlib
NO_DATA_STRING = b"<No data>"
NOT_SET_STRING = b"<Not set>"
# The server stash requires a uuid to store data. Use a hash of the automatic
# beacon data as the uuid to store and retrieve the data.
def string_to_uuid(input):
hash_value = hashlib.md5(str(input).encode("UTF-8")).hexdigest()
return str(uuid.UUID(hex=hash_value))
def main(request, response):
stash = request.server.stash
event_type = request.GET.first(b"type", NO_DATA_STRING)
# The stash is accessed concurrently by many clients. A lock is used to
# avoid interleaved read/write from different clients.
with stash.lock:
# GET requests with an 'expected_body' parameter imply they were sent as
# the request from nextBeacon().
if request.method == "GET" and b"expected_body" in request.GET:
expected_body = request.GET.first(b"expected_body", NO_DATA_STRING)
data = stash.take(
string_to_uuid(event_type + expected_body)) or NOT_SET_STRING
return (200, [], data)
# Requests with a body imply they were sent as a reporting beacon
# (either through reportEvent() or through an automatic beacon).
if request.method == "POST" and event_type:
request_body = request.body or NO_DATA_STRING
request_origin = request.headers.get("Origin") or NO_DATA_STRING
request_referrer = request.headers.get("Referer") or NO_DATA_STRING
stash.put(string_to_uuid(event_type + request_body),
(request_origin + b"," + request_referrer))
return (200, [], b"")
# GET requests without an 'expected_body' parameter imply they were sent
# as a destination URL reporting beacon.
if request.method == "GET" and event_type:
request_origin = request.headers.get("Origin") or NO_DATA_STRING
request_referrer = request.headers.get("Referer") or NO_DATA_STRING
stash.put(string_to_uuid(event_type + NO_DATA_STRING),
(request_origin + b"," + request_referrer))
return (200, [], b"")
return (400, [], u"")