Implement oauth support

README.md

@@ -62,14 +62,43 @@ from librespot.zeroconf import ZeroconfServer
 zeroconf = ZeroconfServer.Builder().create()
 ```
 
+### Use OAuth for Login
+
+#### Without auth url callback
+
+```python
+from librespot.core import Session
+
+# This will log an url in the terminal that you have to open
+
+session = Session.Builder() \
+    .oauth(None) \
+    .create()
+```
+
+#### With auth url callback
+
+```python
+from librespot.core import Session
+
+# This will pass the auth url to the method
+
+def auth_url_callback(url):
+    print(url)
+
+session = Session.Builder() \
+    .oauth(auth_url_callback) \
+    .create()
+```
+
 ### Get Spotify's OAuth token
 
 ```python
 from librespot.core import Session
 
 
 session = Session.Builder() \
-    .user_pass("Username", "Password") \
+    .oauth(None) \
     .create()
 
 access_token = session.tokens().get("playlist-read")
@@ -85,7 +114,7 @@ from librespot.metadata import TrackId
 from librespot.audio.decoders import AudioQuality, VorbisOnlyAudioQuality
 
 session = Session.Builder() \
-    .user_pass("Username", "Password") \
+    .oauth(None) \
     .create()
 
 track_id = TrackId.from_uri("spotify:track:xxxxxxxxxxxxxxxxxxxxxx")

librespot/core.py

@@ -29,7 +29,7 @@
 from Cryptodome.PublicKey import RSA
 from Cryptodome.Signature import PKCS1_v1_5
 
-from librespot import util
+from librespot import util, oauth
 from librespot import Version
 from librespot.audio import AudioKeyManager
 from librespot.audio import CdnManager
@@ -48,6 +48,7 @@
 from librespot.metadata import PlaylistId
 from librespot.metadata import ShowId
 from librespot.metadata import TrackId
+from librespot.oauth import OAuth
 from librespot.proto import Authentication_pb2 as Authentication
 from librespot.proto import ClientToken_pb2 as ClientToken
 from librespot.proto import Connect_pb2 as Connect
@@ -1595,6 +1596,18 @@ def stored_file(self,
                         pass
             return self
 
+        def oauth(self, oauth_url_callback) -> Session.Builder:
+            """
+            Login via OAuth
+
+            You can supply an oauth_url_callback method that takes a string and returns the OAuth URL.
+            When oauth_url_callback is None, this will only log the auth url to the console.
+            """
+            if os.path.isfile(self.conf.stored_credentials_file):
+                return self.stored_file(None)
+            self.login_credentials = OAuth(MercuryRequests.keymaster_client_id, "http://127.0.0.1:5588/login", oauth_url_callback).flow()
+            return self
+
         def user_pass(self, username: str, password: str) -> Session.Builder:
             """Create credential from username and password
 

librespot/oauth.py

@@ -0,0 +1,123 @@
+import base64
+import logging
+import random
+import urllib
+from hashlib import sha256
+from http.server import HTTPServer, BaseHTTPRequestHandler
+from urllib.parse import urlparse
+from librespot.proto import Authentication_pb2 as Authentication
+import requests
+
+
+class OAuth:
+    logger = logging.getLogger("Librespot:OAuth")
+    __spotify_auth = "https://accounts.spotify.com/authorize?response_type=code&client_id=%s&redirect_uri=%s&code_challenge=%s&code_challenge_method=S256&scope=%s"
+    __scopes = ["app-remote-control", "playlist-modify", "playlist-modify-private", "playlist-modify-public", "playlist-read", "playlist-read-collaborative", "playlist-read-private", "streaming", "ugc-image-upload", "user-follow-modify", "user-follow-read", "user-library-modify", "user-library-read", "user-modify", "user-modify-playback-state", "user-modify-private", "user-personalized", "user-read-birthdate", "user-read-currently-playing", "user-read-email", "user-read-play-history", "user-read-playback-position", "user-read-playback-state", "user-read-private", "user-read-recently-played", "user-top-read"]
+    __spotify_token = "https://accounts.spotify.com/api/token"
+    __spotify_token_data = {"grant_type": "authorization_code", "client_id": "", "redirect_uri": "", "code": "", "code_verifier": ""}
+    __client_id = ""
+    __redirect_url = ""
+    __code_verifier = ""
+    __code = ""
+    __token = ""
+    __server = None
+    __oauth_url_callback = None
+
+    def __init__(self, client_id, redirect_url, oauth_url_callback):
+        self.__client_id = client_id
+        self.__redirect_url = redirect_url
+        self.__oauth_url_callback = oauth_url_callback
+
+    def __generate_generate_code_verifier(self):
+        possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"
+        verifier = ""
+        for i in range(128):
+            verifier += possible[random.randint(0, len(possible) - 1)]
+        return verifier
+
+    def __generate_code_challenge(self, code_verifier):
+        digest = sha256(code_verifier.encode('utf-8')).digest()
+        return base64.urlsafe_b64encode(digest).decode('utf-8').rstrip('=')
+
+    def get_auth_url(self):
+        self.__code_verifier = self.__generate_generate_code_verifier()
+        auth_url = self.__spotify_auth % (self.__client_id, self.__redirect_url, self.__generate_code_challenge(self.__code_verifier), "+".join(self.__scopes))
+        if self.__oauth_url_callback:
+            self.__oauth_url_callback(auth_url)
+        return auth_url
+
+    def set_code(self, code):
+        self.__code = code
+
+    def request_token(self):
+        if not self.__code:
+            raise RuntimeError("You need to provide a code before!")
+        request_data = self.__spotify_token_data
+        request_data["client_id"] = self.__client_id
+        request_data["redirect_uri"] = self.__redirect_url
+        request_data["code"] = self.__code
+        request_data["code_verifier"] = self.__code_verifier
+        request = requests.post(
+            self.__spotify_token,
+            data=request_data,
+        )
+        if request.status_code != 200:
+            raise RuntimeError("Received status code %d: %s" % (request.status_code, request.reason))
+        self.__token = request.json()["access_token"]
+
+    def get_credentials(self):
+        if not self.__token:
+            raise RuntimeError("You need to request a token bore!")
+        return Authentication.LoginCredentials(
+            typ=Authentication.AuthenticationType.AUTHENTICATION_SPOTIFY_TOKEN,
+            auth_data=self.__token.encode("utf-8")
+        )
+
+    class CallbackServer(HTTPServer):
+        callback_path = None
+
+        def __init__(self, server_address, RequestHandlerClass, callback_path, set_code):
+            self.callback_path = callback_path
+            self.set_code = set_code
+            super().__init__(server_address, RequestHandlerClass)
+
+    class CallbackRequestHandler(BaseHTTPRequestHandler):
+        def do_GET(self):
+            if(self.path.startswith(self.server.callback_path)):
+                query = urllib.parse.parse_qs(urlparse(self.path).query)
+                if not query.__contains__("code"):
+                    self.wfile.write(b"Request doesn't contain 'code'")
+                    return
+                self.server.set_code(query.get("code")[0])
+                self.wfile.write(b"librespot-python received callback")
+            pass
+
+    def __start_server(self):
+        try:
+            self.__server.handle_request()
+        except KeyboardInterrupt:
+            return
+        if not self.__code:
+            self.__start_server()
+
+    def run_callback_server(self):
+        url = urlparse(self.__redirect_url)
+        self.__server = self.CallbackServer(
+            (url.hostname, url.port),
+            self.CallbackRequestHandler,
+            url.path,
+            self.set_code
+        )
+        logging.info("OAuth: Waiting for callback on %s", url.hostname + ":" + str(url.port))
+        self.__start_server()
+
+    def flow(self):
+        logging.info("OAuth: Visit in your browser and log in: %s ", self.get_auth_url())
+        self.run_callback_server()
+        self.request_token()
+        return self.get_credentials()
+
+    def __close(self):
+        if self.__server:
+            self.__server.shutdown()
+