Support seamless authentication

README.md

@@ -7,19 +7,15 @@
 
 * Go to [https://developer.spotify.com/dashboard/applications](https://developer.spotify.com/dashboard/applications) and create an application. Call it whatever you want.
 
-* Create a `.env` or `.envrc` file with contents like this, put it wherever you
-  want.
+* Go to "Edit Settings" in your newly created app, then add `http://localhost`
+  as a redirect URI and hit "Save"
 
-```
-export SPOTIPY_CLIENT_ID='YOUR_CLIENT_ID'
-export SPOTIPY_CLIENT_SECRET='YOUR_CLIENT_SECRET'
-export SPOTIPY_REDIRECT_URI='http://localhost'
-export SPOTIFY_USERNAME='YOUR_SPOTIFY_USERNAME'
-```
+* Find your spotify username [here](https://www.spotify.com/us/account/overview/)
 
-* You can find the values for `SPOTIPY_CLIENT_ID` and `SPOTIPY_CLIENT_SECRET`
-  on the page for your application that you just created.
+* Now you can run `spotsync --username=username --host=my_mpd_host` where
+  `username` is your username from before, and `my_mpd_host` is the host you
+  are running MPD on (defaults to `localhost` if you do not pass it)
 
-* You can find your spotify username [here](https://www.spotify.com/us/account/overview/)
-
-* Now you can run `spotsync` with your `.env` file sourced (e.g. `source .env`)
+* You will be prompted to grant permission to the app, once that's done, it
+  will cache the credentials locally and you should be able to just run
+  spotsync.

requirements.txt

@@ -1,9 +1,12 @@
+bottle==0.12.16
 certifi==2019.3.9
 cffi==1.12.3
 chardet==3.0.4
+httplib2==0.12.3
 idna==2.8
 pycparser==2.19
 python-mpd2==1.0.0
 requests==2.21.0
+spotify-mpd-sync-weskerfoot==0.0.1
 spotipy==2.4.4
 urllib3==1.24.2

setup.py

@@ -15,7 +15,8 @@ setuptools.setup(
     packages=setuptools.find_packages(),
     install_requires = [
         "spotipy>=2.4.4",
-        "python-mpd2>=1.0.0"
+        "python-mpd2>=1.0.0",
+        "bottle>=0.12.16"
     ],
     classifiers= [
         "Programming Language :: Python :: 3",

spotify_mpd_sync/msplaylist/authenticate.py

@@ -0,0 +1,94 @@
+# shows a user's playlists (need to be authenticated via oauth)
+
+from __future__ import print_function
+import os
+import spotipy.oauth2 as oauth2
+import spotipy
+import queue
+import threading
+from bottle import route, run, response, request
+
+auth_token_queue = queue.Queue()
+
+@route('/')
+def index():
+    auth_code = request.query.code
+    if auth_code:
+        auth_token_queue.put(auth_code)
+        return "It worked! You may close this tab now"
+
+    return "Oops! Something went wrong. Please file a bug report"
+
+def run_server():
+    task = threading.Thread(target=lambda : run(host='localhost', port=8080))
+    task.start()
+
+def prompt_for_user_token(username, scope=None, client_id = None,
+        client_secret = None, redirect_uri = None, cache_path = None):
+    """
+    prompts the user to login if necessary and returns
+        the user token suitable for use with the spotipy.Spotify 
+        constructor
+
+        Parameters:
+
+         - username - the Spotify username
+         - scope - the desired scope of the request
+         - client_id - the client id of your app
+         - client_secret - the client secret of your app
+         - redirect_uri - the redirect URI of your app
+         - cache_path - path to location to save tokens
+    """
+
+    if not client_id:
+        client_id = os.getenv('SPOTIPY_CLIENT_ID')
+
+    if not client_secret:
+        client_secret = os.getenv('SPOTIPY_CLIENT_SECRET')
+
+    if not redirect_uri:
+        redirect_uri = os.getenv('SPOTIPY_REDIRECT_URI')
+
+    if not client_id:
+        print('''
+            You need to set your Spotify API credentials. You can do this by
+            setting environment variables like so:
+
+            export SPOTIPY_CLIENT_ID='your-spotify-client-id'
+            export SPOTIPY_CLIENT_SECRET='your-spotify-client-secret'
+            export SPOTIPY_REDIRECT_URI='your-app-redirect-url'
+
+            Get your credentials at     
+                https://developer.spotify.com/my-applications
+        ''')
+        raise spotipy.SpotifyException(550, -1, 'no credentials set')
+
+    cache_path = cache_path or ".cache-" + username
+    sp_oauth = oauth2.SpotifyOAuth(client_id, client_secret, redirect_uri, 
+        scope=scope, cache_path=cache_path)
+
+    # try to get a valid token for this user, from the cache,
+    # if not in the cache, the create a new (this will send
+    # the user to a web page where they can authorize this app)
+
+    token_info = sp_oauth.get_cached_token()
+
+    if not token_info:
+        auth_url = sp_oauth.get_authorize_url()
+        try:
+            import webbrowser
+            webbrowser.open(auth_url)
+            print("Opened %s in your browser" % auth_url)
+        except:
+            print("Please navigate here: %s" % auth_url)
+
+        response = "localhost:8080?code=%s" % auth_token_queue.get()
+        auth_token_queue.task_done()
+
+        code = sp_oauth.parse_response_code(response)
+        token_info = sp_oauth.get_access_token(code)
+    # Auth'ed API request
+    if token_info:
+        return token_info['access_token']
+    else:
+        return None

spotify_mpd_sync/msplaylist/spotify.py

@@ -2,19 +2,30 @@
 
 import spotipy
 from spotipy.oauth2 import SpotifyClientCredentials
+from spotipy.util import prompt_for_user_token
 from mpd import MPDClient
 from mpd.base import CommandError
 from collections import defaultdict
 from re import sub
 from os import environ
+import spotipy.util as util
+
+from spotify_mpd_sync.msplaylist.authenticate import run_server, prompt_for_user_token
 
 class Spotify():
     def __init__(self):
+        run_server()
         self.username = environ.get("SPOTIFY_USERNAME")
-        self.client_credentials_manager = SpotifyClientCredentials()
-        self.sp = spotipy.Spotify(
-                client_credentials_manager=self.client_credentials_manager
-                )
+
+        scope = "playlist-read-private"
+
+        token = prompt_for_user_token(self.username,
+                                      scope,
+                                      client_id=environ.get("SPOTIPY_CLIENT_ID"),
+                                      client_secret=environ.get("SPOTIPY_CLIENT_SECRET"),
+                                      redirect_uri=environ.get("SPOTIPY_REDIRECT_URI"))
+        if token:
+            self.sp = spotipy.Spotify(auth=token)
 
         self.mpd_client = MPDClient()
         self.mpd_client.connect("127.0.0.1", 6600)