Initial python3 changes

Mostly just updating libraries, removing string encoding/decoding,
fixing some edge cases. No new functionality was added in this
commit.

lib/beetsplug/embyupdate.py

@@ -0,0 +1,205 @@
+"""Updates the Emby Library whenever the beets library is changed.
+
+    emby:
+        host: localhost
+        port: 8096
+        username: user
+        apikey: apikey
+        password: password
+"""
+
+import hashlib
+import requests
+
+from urllib.parse import urlencode, urljoin, parse_qs, urlsplit, urlunsplit
+from beets import config
+from beets.plugins import BeetsPlugin
+
+
+def api_url(host, port, endpoint):
+    """Returns a joined url.
+
+    Takes host, port and endpoint and generates a valid emby API url.
+
+    :param host: Hostname of the emby server
+    :param port: Portnumber of the emby server
+    :param endpoint: API endpoint
+    :type host: str
+    :type port: int
+    :type endpoint: str
+    :returns: Full API url
+    :rtype: str
+    """
+    # check if http or https is defined as host and create hostname
+    hostname_list = [host]
+    if host.startswith('http://') or host.startswith('https://'):
+        hostname = ''.join(hostname_list)
+    else:
+        hostname_list.insert(0, 'http://')
+        hostname = ''.join(hostname_list)
+
+    joined = urljoin(
+        '{hostname}:{port}'.format(
+            hostname=hostname,
+            port=port
+        ),
+        endpoint
+    )
+
+    scheme, netloc, path, query_string, fragment = urlsplit(joined)
+    query_params = parse_qs(query_string)
+
+    query_params['format'] = ['json']
+    new_query_string = urlencode(query_params, doseq=True)
+
+    return urlunsplit((scheme, netloc, path, new_query_string, fragment))
+
+
+def password_data(username, password):
+    """Returns a dict with username and its encoded password.
+
+    :param username: Emby username
+    :param password: Emby password
+    :type username: str
+    :type password: str
+    :returns: Dictionary with username and encoded password
+    :rtype: dict
+    """
+    return {
+        'username': username,
+        'password': hashlib.sha1(password.encode('utf-8')).hexdigest(),
+        'passwordMd5': hashlib.md5(password.encode('utf-8')).hexdigest()
+    }
+
+
+def create_headers(user_id, token=None):
+    """Return header dict that is needed to talk to the Emby API.
+
+    :param user_id: Emby user ID
+    :param token: Authentication token for Emby
+    :type user_id: str
+    :type token: str
+    :returns: Headers for requests
+    :rtype: dict
+    """
+    headers = {}
+
+    authorization = (
+        'MediaBrowser UserId="{user_id}", '
+        'Client="other", '
+        'Device="beets", '
+        'DeviceId="beets", '
+        'Version="0.0.0"'
+    ).format(user_id=user_id)
+
+    headers['x-emby-authorization'] = authorization
+
+    if token:
+        headers['x-mediabrowser-token'] = token
+
+    return headers
+
+
+def get_token(host, port, headers, auth_data):
+    """Return token for a user.
+
+    :param host: Emby host
+    :param port: Emby port
+    :param headers: Headers for requests
+    :param auth_data: Username and encoded password for authentication
+    :type host: str
+    :type port: int
+    :type headers: dict
+    :type auth_data: dict
+    :returns: Access Token
+    :rtype: str
+    """
+    url = api_url(host, port, '/Users/AuthenticateByName')
+    r = requests.post(url, headers=headers, data=auth_data)
+
+    return r.json().get('AccessToken')
+
+
+def get_user(host, port, username):
+    """Return user dict from server or None if there is no user.
+
+    :param host: Emby host
+    :param port: Emby port
+    :username: Username
+    :type host: str
+    :type port: int
+    :type username: str
+    :returns: Matched Users
+    :rtype: list
+    """
+    url = api_url(host, port, '/Users/Public')
+    r = requests.get(url)
+    user = [i for i in r.json() if i['Name'] == username]
+
+    return user
+
+
+class EmbyUpdate(BeetsPlugin):
+    def __init__(self):
+        super().__init__()
+
+        # Adding defaults.
+        config['emby'].add({
+            'host': 'http://localhost',
+            'port': 8096,
+            'apikey': None,
+            'password': None,
+        })
+
+        self.register_listener('database_change', self.listen_for_db_change)
+
+    def listen_for_db_change(self, lib, model):
+        """Listens for beets db change and register the update for the end.
+        """
+        self.register_listener('cli_exit', self.update)
+
+    def update(self, lib):
+        """When the client exists try to send refresh request to Emby.
+        """
+        self._log.info('Updating Emby library...')
+
+        host = config['emby']['host'].get()
+        port = config['emby']['port'].get()
+        username = config['emby']['username'].get()
+        password = config['emby']['password'].get()
+        token = config['emby']['apikey'].get()
+
+        # Check if at least a apikey or password is given.
+        if not any([password, token]):
+            self._log.warning('Provide at least Emby password or apikey.')
+            return
+
+        # Get user information from the Emby API.
+        user = get_user(host, port, username)
+        if not user:
+            self._log.warning(f'User {username} could not be found.')
+            return
+
+        if not token:
+            # Create Authentication data and headers.
+            auth_data = password_data(username, password)
+            headers = create_headers(user[0]['Id'])
+
+            # Get authentication token.
+            token = get_token(host, port, headers, auth_data)
+            if not token:
+                self._log.warning(
+                    'Could not get token for user {0}', username
+                )
+                return
+
+        # Recreate headers with a token.
+        headers = create_headers(user[0]['Id'], token=token)
+
+        # Trigger the Update.
+        url = api_url(host, port, '/Library/Refresh')
+        r = requests.post(url, headers=headers)
+        if r.status_code != 204:
+            self._log.warning('Update could not be triggered')
+        else:
+            self._log.info('Update triggered.')