327 lines
12 KiB
Python
327 lines
12 KiB
Python
import falcon
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import json
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import mysql.connector
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import config
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import uuid
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from datetime import datetime, timezone, timedelta
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import os
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import base64
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import sys
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class KnowledgeFileCollection:
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@staticmethod
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def __init__():
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""""Initializes KnowledgeFileCollection"""
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pass
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@staticmethod
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def on_options(req, resp):
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resp.status = falcon.HTTP_200
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@staticmethod
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def on_get(req, resp):
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cnx = mysql.connector.connect(**config.myems_user_db)
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cursor = cnx.cursor(dictionary=True)
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query = (" SELECT uuid, display_name "
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" FROM tbl_users ")
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cursor.execute(query)
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rows = cursor.fetchall()
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cursor.close()
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cnx.disconnect()
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user_dict = dict()
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if rows is not None and len(rows) > 0:
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for row in rows:
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user_dict[row['uuid']] = row['display_name']
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cnx = mysql.connector.connect(**config.myems_system_db)
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cursor = cnx.cursor(dictionary=True)
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query = (" SELECT id, file_name, uuid, upload_datetime_utc, upload_user_uuid, file_object"
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" FROM tbl_knowledge_files "
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" ORDER BY upload_datetime_utc desc ")
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cursor.execute(query)
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rows = cursor.fetchall()
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cursor.close()
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cnx.disconnect()
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result = list()
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if rows is not None and len(rows) > 0:
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timezone_offset = int(config.utc_offset[1:3]) * 60 + int(config.utc_offset[4:6])
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if config.utc_offset[0] == '-':
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timezone_offset = -timezone_offset
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for row in rows:
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# Base64 encode the bytes
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base64_encoded_data = base64.b64encode(row['file_object'])
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# get the Base64 encoded data using human-readable characters.
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base64_message = base64_encoded_data.decode('utf-8')
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upload_datetime_local = row['upload_datetime_utc'].replace(tzinfo=None) + \
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timedelta(minutes=timezone_offset)
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upload_datetime = row['upload_datetime_utc']
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upload_datetime = upload_datetime.replace(tzinfo=timezone.utc)
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meta_result = {"id": row['id'],
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"file_name": row['file_name'],
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"uuid": row['uuid'],
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"upload_datetime": upload_datetime.timestamp() * 1000,
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"upload_datetime_local": upload_datetime_local.isoformat(),
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"user_display_name": user_dict.get(row['upload_user_uuid'], None),
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"file_size_bytes": sys.getsizeof(row['file_object']),
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"file_bytes_base64": base64_message
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}
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result.append(meta_result)
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resp.body = json.dumps(result)
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@staticmethod
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def on_post(req, resp):
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"""Handles POST requests"""
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try:
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upload = req.get_param('file')
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# Read upload file as binary
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raw_blob = upload.file.read()
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# Retrieve filename
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filename = upload.filename
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file_uuid = str(uuid.uuid4())
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# Define file_path
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file_path = os.path.join(config.upload_path, file_uuid)
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# Write to a temporary file to prevent incomplete files from
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# being used.
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temp_file_path = file_path + '~'
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open(temp_file_path, 'wb').write(raw_blob)
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# Now that we know the file has been fully saved to disk
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# move it into place.
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os.rename(temp_file_path, file_path)
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except Exception as ex:
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raise falcon.HTTPError(falcon.HTTP_400, title='API.ERROR',
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description='API.FAILED_TO_UPLOAD_KNOWLEDGE_FILE')
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# Verify User Session
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token = req.headers.get('TOKEN')
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user_uuid = req.headers.get('USER-UUID')
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if token is None:
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raise falcon.HTTPError(falcon.HTTP_400, title='API.BAD_REQUEST',
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description='API.TOKEN_NOT_FOUND_IN_HEADERS_PLEASE_LOGIN')
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if user_uuid is None:
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raise falcon.HTTPError(falcon.HTTP_400, title='API.BAD_REQUEST',
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description='API.USER_UUID_NOT_FOUND_IN_HEADERS_PLEASE_LOGIN')
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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, (user_uuid, token,))
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row = cursor.fetchone()
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if row is None:
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if cursor:
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cursor.close()
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if cnx:
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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.INVALID_SESSION_PLEASE_RE_LOGIN')
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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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if cursor:
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cursor.close()
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if cnx:
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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.USER_SESSION_TIMEOUT')
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cursor.execute(" SELECT id "
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" FROM tbl_users "
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" WHERE uuid = %s ",
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(user_uuid,))
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row = cursor.fetchone()
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if row is None:
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if cursor:
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cursor.close()
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if cnx:
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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.INVALID_USER_PLEASE_RE_LOGIN')
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else:
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user_id = row[0]
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cnx = mysql.connector.connect(**config.myems_system_db)
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cursor = cnx.cursor()
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add_values = (" INSERT INTO tbl_knowledge_files "
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" (file_name, uuid, upload_datetime_utc, upload_user_uuid, file_object ) "
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" VALUES (%s, %s, %s, %s, %s) ")
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cursor.execute(add_values, (filename,
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file_uuid,
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datetime.utcnow(),
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user_uuid,
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raw_blob))
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new_id = cursor.lastrowid
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cnx.commit()
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cursor.close()
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cnx.disconnect()
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resp.status = falcon.HTTP_201
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resp.location = '/knowledgefiles/' + str(new_id)
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class KnowledgeFileItem:
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@staticmethod
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def __init__():
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""""Initializes KnowledgeFileItem"""
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pass
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@staticmethod
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def on_options(req, resp, id_):
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resp.status = falcon.HTTP_200
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@staticmethod
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def on_get(req, resp, id_):
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if not id_.isdigit() or int(id_) <= 0:
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raise falcon.HTTPError(falcon.HTTP_400, title='API.BAD_REQUEST',
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description='API.INVALID_KNOWLEDGE_FILE_ID')
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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 uuid, display_name "
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" FROM tbl_users ")
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cursor.execute(query)
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rows = cursor.fetchall()
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cursor.close()
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cnx.disconnect()
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user_dict = dict()
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if rows is not None and len(rows) > 0:
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for row in rows:
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user_dict[row[0]] = row[1]
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cnx = mysql.connector.connect(**config.myems_system_db)
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cursor = cnx.cursor()
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query = (" SELECT id, file_name, uuid, upload_datetime_utc, upload_user_uuid "
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" FROM tbl_knowledge_files "
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" WHERE id = %s ")
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cursor.execute(query, (id_,))
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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_404, title='API.NOT_FOUND',
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description='API.KNOWLEDGE_FILE_NOT_FOUND')
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upload_datetime = row[3]
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upload_datetime = upload_datetime.replace(tzinfo=timezone.utc)
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result = {"id": row[0],
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"file_name": row[1],
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"uuid": row[2],
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"upload_datetime": upload_datetime.timestamp() * 1000,
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"user_display_name": user_dict.get(row[4], None)}
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resp.body = json.dumps(result)
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@staticmethod
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def on_delete(req, resp, id_):
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if not id_.isdigit() or int(id_) <= 0:
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raise falcon.HTTPError(falcon.HTTP_400,
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title='API.BAD_REQUEST',
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description='API.INVALID_KNOWLEDGE_FILE_ID')
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cnx = mysql.connector.connect(**config.myems_system_db)
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cursor = cnx.cursor()
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cursor.execute(" SELECT uuid "
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" FROM tbl_knowledge_files "
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" WHERE id = %s ", (id_,))
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row = cursor.fetchone()
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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,
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title='API.NOT_FOUND',
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description='API.KNOWLEDGE_FILE_NOT_FOUND')
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try:
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file_uuid = row[0]
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# Define file_path
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file_path = os.path.join(config.upload_path, file_uuid)
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# remove the file from disk
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os.remove(file_path)
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except Exception as ex:
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raise falcon.HTTPError(falcon.HTTP_400, title='API.ERROR',
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description='API.KNOWLEDGE_FILE_NOT_FOUND')
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cursor.execute(" DELETE FROM tbl_knowledge_files WHERE id = %s ", (id_,))
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cnx.commit()
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cursor.close()
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cnx.disconnect()
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resp.status = falcon.HTTP_204
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class KnowledgeFileRestore:
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@staticmethod
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def __init__():
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""""Initializes KnowledgeFileRestore"""
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pass
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@staticmethod
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def on_options(req, resp, id_):
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resp.status = falcon.HTTP_200
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@staticmethod
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def on_get(req, resp, id_):
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if not id_.isdigit() or int(id_) <= 0:
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raise falcon.HTTPError(falcon.HTTP_400, title='API.BAD_REQUEST',
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description='API.INVALID_KNOWLEDGE_FILE_ID')
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cnx = mysql.connector.connect(**config.myems_system_db)
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cursor = cnx.cursor()
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query = (" SELECT uuid, file_object "
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" FROM tbl_knowledge_files "
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" WHERE id = %s ")
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cursor.execute(query, (id_,))
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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_404, title='API.NOT_FOUND',
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description='API.KNOWLEDGE_FILE_NOT_FOUND')
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result = {"uuid": row[0],
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"file_object": row[1]}
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try:
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raw_blob = result["file_object"]
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file_uuid = result["uuid"]
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# Define file_path
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file_path = os.path.join(config.upload_path, file_uuid)
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# Write to a temporary file to prevent incomplete files from
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# being used.
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temp_file_path = file_path + '~'
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open(temp_file_path, 'wb').write(raw_blob)
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# Now that we know the file has been fully saved to disk
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# move it into place.
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os.replace(temp_file_path, file_path)
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except Exception as ex:
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raise falcon.HTTPError(falcon.HTTP_400, title='API.ERROR',
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description='API.FAILED_TO_RESTORE_KNOWLEDGE_FILE')
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resp.body = json.dumps('success')
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