Use Android-Job to pull notifications. Closes #401. (#431)

app/src/main/java/com/keylesspalace/tusky/network/AuthInterceptor.java

@@ -0,0 +1,53 @@
+package com.keylesspalace.tusky.network;
+
+import android.content.Context;
+import android.content.SharedPreferences;
+import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
+
+import com.keylesspalace.tusky.R;
+
+import java.io.IOException;
+
+import okhttp3.Interceptor;
+import okhttp3.Request;
+import okhttp3.Response;
+
+/**
+ * Created by charlag on 31/10/17.
+ */
+
+public final class AuthInterceptor implements Interceptor, SharedPreferences.OnSharedPreferenceChangeListener {
+
+    private static final String TOKEN_KEY = "accessToken";
+
+    @Nullable
+    private String token;
+
+    public AuthInterceptor(Context context) {
+        SharedPreferences preferences  = context.getSharedPreferences(
+                context.getString(R.string.preferences_file_key), Context.MODE_PRIVATE);
+        token = preferences.getString(TOKEN_KEY, null);
+        preferences.registerOnSharedPreferenceChangeListener(this);
+    }
+
+    @Override
+    public Response intercept(@NonNull Chain chain) throws IOException {
+        Request originalRequest = chain.request();
+
+        Request.Builder builder = originalRequest.newBuilder();
+        if (token != null) {
+            builder.header("Authorization", String.format("Bearer %s", token));
+        }
+        Request newRequest = builder.build();
+
+        return chain.proceed(newRequest);
+    }
+
+    @Override
+    public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
+        if (key.equals(TOKEN_KEY)) {
+            token = sharedPreferences.getString(TOKEN_KEY, null);
+        }
+    }
+}