ticketfrei/db.py

from bottle import redirect, request, response
from functools import wraps
from inspect import Signature
import jwt
from os import path, urandom
from pylibscrypt import scrypt_mcf, scrypt_mcf_check
import sqlite3
import backend
from mastodon import Mastodon


class DB(object):
    def __init__(self):
        self.config = backend.get_config()
        self.logger = backend.get_logger(self.config)
        dbfile = path.join(path.dirname(path.abspath(__file__)),
                           'ticketfrei.sqlite')
        self.conn = sqlite3.connect(dbfile)
        self.cur = self.conn.cursor()
        self.create()
        self.secret = urandom(32)

    def create(self):
        # init db
        self.cur.executescript('''
            CREATE TABLE IF NOT EXISTS user (
                id          INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT UNIQUE,
                email       TEXT,
                passhash    TEXT,
                enabled     INTEGER DEFAULT 1
            );
            CREATE TABLE IF NOT EXISTS twitter_request_tokens (
                id          INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT UNIQUE,
                user_id	    INTEGER,
                request_token	TEXT,
                FOREIGN KEY(user_id) REFERENCES user(id)
            );
            CREATE TABLE IF NOT EXISTS twitter_accounts (
                id	    INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT UNIQUE,
                user_id	    INTEGER,
                client_id   TEXT,
                client_secret	TEXT,
                FOREIGN KEY(user_id) REFERENCES user(id)
            );
            CREATE TABLE IF NOT EXISTS trigger_good (
                id	    INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT UNIQUE,
                user_id	    INTEGER,
                words	    TEXT,
                FOREIGN KEY(user_id) REFERENCES user(id)
            );
            CREATE TABLE IF NOT EXISTS trigger_bad (
                id	    INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT UNIQUE,
                user_id	    INTEGER,
                words	    TEXT,
                FOREIGN KEY(user_id) REFERENCES user(id)
            );
            CREATE TABLE IF NOT EXISTS mastodon_instances (
                id	    INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT UNIQUE,
                instance    TEXT,
                client_id   TEXT,
                client_secret   TEXT
            );
            CREATE TABLE IF NOT EXISTS mastodon_accounts (
                id	    INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT UNIQUE,
                user_id	    INTEGER,
                access_token	TEXT,
                instance_id TEXT,
                active      INTEGER,
                FOREIGN KEY(user_id) REFERENCES user(id),
                FOREIGN KEY(instance_id) REFERENCES mastodon_instances(id)
            );
            CREATE TABLE IF NOT EXISTS seen_toots (
                id	    INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT UNIQUE,
                user_id	    INTEGER,
                mastodon_accounts_id    INTEGER,
                toot_id	    TEXT,
                FOREIGN KEY(user_id) REFERENCES user(id),
                FOREIGN KEY(mastodon_accounts_id)
                    REFERENCES mastodon_accounts(id)
            );
            CREATE TABLE IF NOT EXISTS mail (
                id	    INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT UNIQUE,
                user_id	    INTEGER,
                email	    TEXT,
                active      INTEGER,
                FOREIGN KEY(user_id) REFERENCES user(id)
            );
            CREATE TABLE IF NOT EXISTS seen_tweets (
                id	    INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT UNIQUE,
                user_id	    INTEGER,
                twitter_accounts_id INTEGER,
                tweet_id    TEXT,
                FOREIGN KEY(user_id) REFERENCES user(id)
                FOREIGN KEY(twitter_accounts_id)
                    REFERENCES twitter_accounts(id)
            );
        ''')

    def token(self, email, password):
        return jwt.encode({
            'email': email,
            'passhash': scrypt_mcf(password.encode('utf-8')).decode('ascii')
            }, self.secret).decode('ascii')

    def register(self, token):
        json = jwt.decode(token, self.secret)
        # create user
        self.cur.execute("INSERT INTO user (email, passhash) VALUES(?, ?);",
                         (json['email'], json['passhash']))
        self.conn.commit()
        return User(self, self.cur.lastrowid)

    def authenticate(self, email, password):
        # check email/password
        self.cur.execute("SELECT id, passhash FROM user WHERE email=?;",
                         (email, ))
        row = self.cur.fetchone()
        if not row:
            return None  # No user with this email
        if not scrypt_mcf_check(row[1].encode('ascii'),
                                password.encode('utf-8')):
            return None  # Wrong passphrase
        return User(self, row[0])

    def by_email(self, email):
        self.cur.execute("SELECT id FROM user WHERE email=?;", (email, ))
        row = self.cur.fetchone()
        if not row:
            return None
        return User(self, row[0])

    def close(self):
        self.conn.close()


class User(object):
    def __init__(self, db, uid):
        # set cookie
        response.set_cookie('uid', uid, secret=db.secret, path='/')
        self.db = db
        self.uid = uid

    def state(self):
        return dict(foo='bar')

    def save_request_token(self, token):
        self.db.cur.execute("INSERT INTO twitter_request_tokens(user_id, request_token) VALUES(?, ?);",
                            (self.uid, token))
        self.db.conn.commit()

    def get_request_token(self):
        self.db.cur.execute("SELECT request_token FROM twitter_request_tokens WHERE user_id = ?;", (id,))
        request_token = self.db.cur.fetchone()[0]
        self.db.cur.execute("DELETE FROM twitter_request_tokens WHERE user_id = ?;", (id,))
        self.db.conn.commit()
        return request_token

    def save_twitter_token(self, access_token, access_token_secret):
        self.db.cur.execute(
            "INSERT INTO twitter_accounts(user_id, access_token_key, access_token_secret) VALUES(?, ?, ?);",
            (id, access_token, access_token_secret))
        self.db.conn.commit()

    def get_mastodon_app_keys(self, instance):
        self.db.cur.execute("SELECT client_id, client_secret FROM mastodon_instances WHERE instance = ?;", (instance, ))
        try:
            row = self.db.cur.fetchone()
            client_id = row[0]
            client_secret = row[1]
            return client_id, client_secret
        except TypeError:
            app_name = "ticketfrei" + str(self.db.secret)[0:4]
            client_id, client_secret = Mastodon.create_app(app_name, api_base_url=instance)
            self.db.cur.execute("INSERT INTO mastodon_instances(instance, client_id, client_secret) VALUES(?, ?, ?);",
                                (instance, client_id, client_secret))
            self.db.conn.commit()
            return client_id, client_secret

    def save_masto_token(self, access_token, instance):
        self.db.cur.execute("SELECT id FROM mastodon_instances WHERE instance = ?;", (instance, ))
        instance_id = self.db.cur.fetchone()[0]
        self.db.cur.execute("INSERT INTO mastodon_accounts(user_id, access_token, instance_id, active) "
                            "VALUES(?, ?, ?, ?);", (self.uid, access_token, instance_id, 1))
        self.db.conn.commit()


class DBPlugin(object):
    name = 'DBPlugin'
    api = 2

    def __init__(self, loginpage):
        self.db = DB()
        self.loginpage = loginpage

    def close(self):
        self.db.close()

    def apply(self, callback, route):
        uservar = route.config.get('user', None)
        dbvar = route.config.get('db', None)
        signature = Signature.from_callable(route.callback)

        @wraps(callback)
        def wrapper(*args, **kwargs):
            if uservar and uservar in signature.parameters:
                uid = request.get_cookie('uid', secret=self.db.secret)
                if uid is None:
                    return redirect(self.loginpage)
                kwargs[uservar] = User(self.db, uid)
            if dbvar and dbvar in signature.parameters:
                kwargs[dbvar] = self.db
            return callback(*args, **kwargs)

        return wrapper