Added Spotify metadata service

maloja/thirdparty/__init__.py

@@ -9,6 +9,7 @@
 import xml.etree.ElementTree as ElementTree
 import json
 import urllib.parse, urllib.request
+import base64
 from doreah.settings import get_settings
 from doreah.logging import log
 
@@ -52,6 +53,7 @@ class GenericInterface:
 		# avoid constant disk access, restart on adding services is acceptable
 		for key in self.settings:
 			self.settings[key] = get_settings(self.settings[key])
+		self.authorize()
 
 	def __init_subclass__(cls,abstract=False):
 		if not abstract:
@@ -66,6 +68,10 @@ class GenericInterface:
 				services["metadata"].append(s)
 				log(cls.name + " registered as metadata provider")
 
+	def authorize(self):
+		return True
+		# per default. no authorization is necessary
+
 # proxy scrobbler
 class ProxyScrobbleInterface(GenericInterface,abstract=True):
 
@@ -150,13 +156,15 @@ class MetadataInterface(GenericInterface,abstract=True):
 
 def utf(st):
 	return st.encode(encoding="UTF-8")
-
+def b64(inp):
+	return base64.b64encode(inp)
 
 
 
 ### actually create everything
 
 __all__ = [
-	"lastfm"
+	"lastfm",
+	"spotify"
 ]
 from . import *

maloja/thirdparty/spotify.py

@@ -0,0 +1,36 @@
+from . import MetadataInterface, utf, b64
+import hashlib
+import urllib.parse, urllib.request
+import json
+
+class Spotify(MetadataInterface):
+	name = "Spotify"
+
+	settings = {
+		"apiid":"SPOTIFY_API_ID",
+		"secret":"SPOTIFY_API_SECRET"
+	}
+
+	metadata = {
+		"trackurl": "https://api.spotify.com/v1/search?q={artist}%20{title}&type=track&access_token={token}",
+		"response_type":"json",
+		"response_parse_tree": ["tracks","items",0,"album","images",0,"url"],
+		"required_settings": ["apiid","secret"],
+		"activated_setting": "METADATA_SPOTIFY"
+	}
+
+	def authorize(self):
+
+		keys = {
+			"url":"https://accounts.spotify.com/api/token",
+			"method":"POST",
+			"headers":{
+				"Authorization":"Basic " + b64(utf(self.settings["apiid"] + ":" + self.settings["secret"])).decode("utf-8")
+			},
+			"data":bytes(urllib.parse.urlencode({"grant_type":"client_credentials"}),encoding="utf-8")
+		}
+		req = urllib.request.Request(**keys)
+		response = urllib.request.urlopen(req)
+		self.settings["token"] = json.loads(response.read())["access_token"]
+		print(self.settings)
+		return True