system: You are an expert security code reviewer. You will be shown a source code file along with a catalog of candidate CWE (Common Weakness Enumeration) categories with their official MITRE names. Your task is to list every distinct CWE from that catalog that is actually present in the code. The catalog is comprehensive for this dataset -- the answer is a (possibly small) subset of it.

OUTPUT FORMAT: Respond with a comma-separated list of CWE IDs in the form `CWE-N`, sorted in ascending numeric order, wrapped in a single \boxed{...}. Examples: `\boxed{CWE-79}` for one, `\boxed{CWE-22,CWE-79,CWE-327}` for three. Output the boxed answer ONLY -- no explanation, no other text.

user: ```python
# Copyright 2022 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,

"""
This application recieves data on HTTP endpoint and inserts into BQ
"""

import json
import logging
import os

from flask import Flask, request, jsonify
from google.api_core import retry
from google.cloud import bigquery
import google.cloud.logging
from google.cloud.logging.handlers import CloudLoggingHandler
from jsonschema import validate, ValidationError


PROJECT_ID = os.getenv('GCP_PROJECT')
BQ_DATASET = os.getenv('BQ_DATASET')
BQ_TABLE = os.getenv('BQ_TABLE')
SERVING_PORT = os.environ.get("SERVING_PORT", 8080)
LOG_LEVEL = os.environ.get("LOG_LEVEL", logging.INFO)
SCHEMA = {
  "type": "object",
  "properties": {
    "Name": { "type": "string" },
    "Age": { "type": "integer" }
  },
  "required": ["Name", "Age"],
  "additionalProperties": False
}

class BigQueryError(Exception):
    '''Exception raised whenever a BigQuery error happened'''

    def __init__(self, errors):
        super().__init__(self._format(errors))
        self.errors = errors

    def _format(self, errors):
        err = []
        for error in errors:
            err.extend(error['errors'])
        return json.dumps(err)


class BQApiClient:
    '''BQ Client to process bq requests'''

    def __init__(self, project_id):
        self._project_id = project_id
        self._client = bigquery.Client(PROJECT_ID)

    def insert(self, data, dataset, table):
        '''Insert data into BQ'''
        LOG.debug("Inserting data  in to %s:%s:%s",
                  PROJECT_ID,  dataset, table)
        table = self._client.dataset(dataset).table(table)
        errors = self._client.insert_rows_json(table,
                                               json_rows=[data],
                                               retry=retry.Retry(deadline=30))
        if errors:
            raise BigQueryError(errors)
        LOG.debug("Successfully Inserted data in to %s:%s:%s",
                  PROJECT_ID,  dataset, table)


def _get_logger():
    client = google.cloud.logging.Client(PROJECT_ID)
    handler = CloudLoggingHandler(client, name="cr-events-processor")
    cloud_logger = logging.getLogger('cr-events-processor')
    cloud_logger.setLevel(LOG_LEVEL)
    cloud_logger.addHandler(handler)
    return cloud_logger


app = Flask(__name__)
LOG = _get_logger()


@app.route("/")
def ping():
    '''Handle ping request'''
    return "BQ insertion Service"


@app.route("/events", methods=['POST'])
def post_events():
    '''Handle event POST request'''
    try:
        event = request.json
        LOG.debug("Recieved event %s", event)
        validate(instance=event, schema=SCHEMA)
        client = BQApiClient(PROJECT_ID)
        client.insert(event, BQ_DATASET, BQ_TABLE)
        return jsonify(status="success"), 200
    except ValidationError as er:
        return jsonify(status="Failure", reason=str(er)), 400
    except BigQueryError as bq_error:
        LOG.error(
            "Failed to insert data in to BQ due to bq_error: %s", str(bq_error))
        return jsonify(status="Failure", reason=str(bq_error)), 500
    except Exception as ex:
        LOG.error(
            "Failed to insert data due to %s", str(ex))
        return jsonify(status="Failure", reason=str(ex)), 500


if __name__ == "__main__":
    app.run(debug=True, host="0.0.0.0", port=int(SERVING_PORT))

```

Candidate CWE catalog (every CWE that appears anywhere in this dataset):
  - CWE-20: Improper Input Validation
  - CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
  - CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
  - CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
  - CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
  - CWE-89: Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
  - CWE-94: Improper Control of Generation of Code ('Code Injection')
  - CWE-113: Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')
  - CWE-116: Improper Encoding or Escaping of Output
  - CWE-117: Improper Output Neutralization for Logs
  - CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
  - CWE-209: Generation of Error Message Containing Sensitive Information
  - CWE-215: Insertion of Sensitive Information Into Debugging Code
  - CWE-295: Improper Certificate Validation
  - CWE-312: Cleartext Storage of Sensitive Information
  - CWE-326: Inadequate Encryption Strength
  - CWE-327: Use of a Broken or Risky Cryptographic Algorithm
  - CWE-377: Insecure Temporary File
  - CWE-502: Deserialization of Untrusted Data
  - CWE-601: URL Redirection to Untrusted Site ('Open Redirect')
  - CWE-611: Improper Restriction of XML External Entity Reference
  - CWE-614: Sensitive Cookie in HTTPS Session Without 'Secure' Attribute
  - CWE-643: Improper Neutralization of Data within XPath Expressions ('XPath Injection')
  - CWE-730: OWASP Top Ten 2004 Category A9 - Denial of Service
  - CWE-732: Incorrect Permission Assignment for Critical Resource
  - CWE-776: Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion')
  - CWE-918: Server-Side Request Forgery (SSRF)
  - CWE-943: Improper Neutralization of Special Elements in Data Query Logic
  - CWE-1004: Sensitive Cookie Without 'HttpOnly' Flag
  - CWE-1333: Inefficient Regular Expression Complexity

List every distinct CWE from the catalog above that is actually present in this code.
Answer: CWE-117,CWE-209,CWE-215