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import os |
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from functools import wraps |
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3
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import config |
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import mysql.connector |
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from datetime import datetime |
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import uuid |
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from gunicorn.http.body import Body |
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import simplejson as json |
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import falcon |
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def access_control(req): |
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""" |
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Check administrator privilege in request headers to protect resources from invalid access |
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:param req: HTTP request |
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:return: HTTPError if invalid else None |
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""" |
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if 'USER-UUID' not in req.headers or \ |
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not isinstance(req.headers['USER-UUID'], str) or \ |
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len(str.strip(req.headers['USER-UUID'])) == 0: |
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raise falcon.HTTPError(falcon.HTTP_400, title='API.BAD_REQUEST', |
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description='API.INVALID_USER_UUID') |
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admin_user_uuid = str.strip(req.headers['USER-UUID']) |
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if 'TOKEN' not in req.headers or \ |
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not isinstance(req.headers['TOKEN'], str) or \ |
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len(str.strip(req.headers['TOKEN'])) == 0: |
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raise falcon.HTTPError(falcon.HTTP_400, title='API.BAD_REQUEST', |
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description='API.INVALID_TOKEN') |
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admin_token = str.strip(req.headers['TOKEN']) |
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# Check administrator privilege |
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cnx = mysql.connector.connect(**config.myems_user_db) |
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cursor = cnx.cursor() |
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query = (" SELECT utc_expires " |
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" FROM tbl_sessions " |
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" WHERE user_uuid = %s AND token = %s") |
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cursor.execute(query, (admin_user_uuid, admin_token,)) |
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row = cursor.fetchone() |
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View Code Duplication |
if row is None: |
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cursor.close() |
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cnx.disconnect() |
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raise falcon.HTTPError(falcon.HTTP_404, title='API.NOT_FOUND', |
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description='API.ADMINISTRATOR_SESSION_NOT_FOUND') |
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else: |
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utc_expires = row[0] |
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if datetime.utcnow() > utc_expires: |
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cursor.close() |
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cnx.disconnect() |
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raise falcon.HTTPError(falcon.HTTP_400, title='API.BAD_REQUEST', |
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description='API.ADMINISTRATOR_SESSION_TIMEOUT') |
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query = (" SELECT name " |
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" FROM tbl_users " |
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" WHERE uuid = %s AND is_admin = true ") |
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cursor.execute(query, (admin_user_uuid,)) |
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row = cursor.fetchone() |
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cursor.close() |
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cnx.disconnect() |
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if row is None: |
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raise falcon.HTTPError(falcon.HTTP_400, 'API.BAD_REQUEST', 'API.INVALID_PRIVILEGE') |
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def write_log(user_uuid, request_method, resource_type, resource_id, request_body): |
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""" |
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:param user_uuid: user_uuid |
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:param request_method: 'POST', 'PUT', 'DELETE' |
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:param resource_type: class_name |
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:param resource_id: int |
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:param request_body: json in raw string |
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""" |
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cnx = None |
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cursor = None |
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try: |
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cnx = mysql.connector.connect(**config.myems_user_db) |
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cursor = cnx.cursor() |
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add_row = (" INSERT INTO tbl_logs " |
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" (user_uuid, request_datetime_utc, request_method, resource_type, resource_id, request_body) " |
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" VALUES (%s, %s, %s, %s, %s , %s) ") |
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cursor.execute(add_row, (user_uuid, |
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datetime.utcnow(), |
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request_method, |
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resource_type, |
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resource_id if resource_id else None, |
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request_body if request_body else None, |
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)) |
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cnx.commit() |
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except Exception as e: |
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print('write_log:' + str(e)) |
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finally: |
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if cnx: |
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cnx.disconnect() |
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if cursor: |
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cursor.close() |
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def user_logger(func): |
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""" |
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Decorator for logging user activities |
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:param func: the decorated function |
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:return: the decorator |
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""" |
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@wraps(func) |
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def logger(*args, **kwargs): |
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qualified_name = func.__qualname__ |
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class_name = qualified_name.split(".")[0] |
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func_name = qualified_name.split(".")[1] |
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if func_name not in ("on_post", "on_put", "on_delete"): |
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# do not log for other HTTP Methods |
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func(*args, **kwargs) |
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return |
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req, resp = args |
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headers = req.headers |
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if headers is not None and 'USER-UUID' in headers.keys(): |
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user_uuid = headers['USER-UUID'] |
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else: |
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# todo: deal with requests with NULL user_uuid |
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print('user_logger: USER-UUID is NULL') |
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# do not log for NULL user_uuid |
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func(*args, **kwargs) |
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return |
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if func_name == "on_post": |
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try: |
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file_name = str(uuid.uuid4()) |
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with open(file_name, "wb") as fw: |
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reads = req.stream.read() |
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fw.write(reads) |
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raw_json = reads.decode('utf-8') |
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with open(file_name, "rb") as fr: |
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req.stream = Body(fr) |
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os.remove(file_name) |
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func(*args, **kwargs) |
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write_log(user_uuid=user_uuid, request_method='POST', resource_type=class_name, |
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resource_id=kwargs.get('id_'), request_body=raw_json) |
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except Exception as e: |
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if isinstance(e, falcon.HTTPError): |
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raise e |
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else: |
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print('user_logger:' + str(e)) |
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return |
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elif func_name == "on_put": |
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try: |
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file_name = str(uuid.uuid4()) |
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with open(file_name, "wb") as fw: |
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reads = req.stream.read() |
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fw.write(reads) |
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raw_json = reads.decode('utf-8') |
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with open(file_name, "rb") as fr: |
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req.stream = Body(fr) |
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os.remove(file_name) |
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func(*args, **kwargs) |
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write_log(user_uuid=user_uuid, request_method='PUT', resource_type=class_name, |
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resource_id=kwargs.get('id_'), request_body=raw_json) |
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except Exception as e: |
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if isinstance(e, falcon.HTTPError): |
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raise e |
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else: |
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print('user_logger:' + str(e)) |
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return |
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elif func_name == "on_delete": |
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try: |
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func(*args, **kwargs) |
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write_log(user_uuid=user_uuid, request_method="DELETE", resource_type=class_name, |
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resource_id=kwargs.get('id_'), request_body=json.dumps(kwargs)) |
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except Exception as e: |
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if isinstance(e, falcon.HTTPError): |
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raise e |
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else: |
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print('user_logger:' + str(e)) |
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return |
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return logger |
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MyEMS /
myems
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