From a5e6dad9bf85c83ff20ce7dd0a9a81e2177d99a0 Mon Sep 17 00:00:00 2001
From: Hans-Christoph Steiner <hans@eds.org>
Date: Tue, 28 Jun 2016 21:04:45 +0200
Subject: [PATCH] allow apps to request OBB download URLs from F-Droid

By sending an Intent to F-Droid, it will reply with the full download URL
to the OBB file, if one exists for the currently installed version of the
requesting app.
---
 app/src/main/AndroidManifest.xml              |  2 +
 .../fdroid/fdroid/data/ObbUrlActivity.java    | 69 +++++++++++++++++++
 2 files changed, 71 insertions(+)
 create mode 100644 app/src/main/java/org/fdroid/fdroid/data/ObbUrlActivity.java

diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index eb2332ace..04ad5e943 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -430,6 +430,8 @@
         <activity
             android:name=".privileged.install.InstallExtensionDialogActivity"
             android:theme="@style/AppThemeTransparent" />
+        <activity android:name=".data.ObbUrlActivity"
+            android:theme="@android:style/Theme.NoDisplay" />
         <receiver
             android:name=".privileged.install.InstallExtensionBootReceiver" >
             <intent-filter>
diff --git a/app/src/main/java/org/fdroid/fdroid/data/ObbUrlActivity.java b/app/src/main/java/org/fdroid/fdroid/data/ObbUrlActivity.java
new file mode 100644
index 000000000..920483473
--- /dev/null
+++ b/app/src/main/java/org/fdroid/fdroid/data/ObbUrlActivity.java
@@ -0,0 +1,69 @@
+package org.fdroid.fdroid.data;
+
+import android.app.Activity;
+import android.content.ComponentName;
+import android.content.Intent;
+import android.content.pm.PackageInfo;
+import android.content.pm.PackageManager;
+import android.net.Uri;
+import android.os.Bundle;
+
+import org.fdroid.fdroid.Utils;
+
+/**
+ * Replies with the public download URL for the OBB that belongs to the
+ * requesting app/version.  If it doesn't know the OBB URL for the requesting
+ * app, the {@code resultCode} will be {@link Activity#RESULT_CANCELED}. The
+ * request must be sent with {@link Activity#startActivityForResult(Intent, int)}
+ * in order to receive a reply, which will include an {@link Intent} with the
+ * URL as data and the SHA-256 hash as a String {@code Intent} extra.
+ */
+public class ObbUrlActivity extends Activity {
+    public static final String TAG = "ObbUrlActivity";
+
+    public static final String ACTION_GET_OBB_MAIN_URL = "org.fdroid.fdroid.action.GET_OBB_MAIN_URL";
+    public static final String ACTION_GET_OBB_PATCH_URL = "org.fdroid.fdroid.action.GET_OBB_PATCH_URL";
+
+    public static final String EXTRA_SHA256 = "org.fdroid.fdroid.extra.SHA256";
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        Intent intent = getIntent();
+        ComponentName componentName = getCallingActivity();
+        setResult(RESULT_CANCELED);
+        if (intent != null && componentName != null) {
+            String action = intent.getAction();
+            String packageName = componentName.getPackageName();
+            Apk apk = null;
+
+            try {
+                PackageManager pm = getPackageManager();
+                PackageInfo packageInfo = pm.getPackageInfo(packageName, 0);
+                apk = ApkProvider.Helper.findApkFromAnyRepo(this, packageName, packageInfo.versionCode);
+            } catch (PackageManager.NameNotFoundException e) {
+                Utils.debugLog(TAG, e.getLocalizedMessage());
+            }
+
+            if (apk == null) {
+                Utils.debugLog(TAG, "got null APK for " + packageName);
+            } else if (ACTION_GET_OBB_MAIN_URL.equals(action)) {
+                String url = apk.getMainObbUrl();
+                if (url != null) {
+                    intent.setData(Uri.parse(url));
+                    intent.putExtra(EXTRA_SHA256, apk.obbMainFileSha256);
+                }
+                setResult(RESULT_OK, intent);
+            } else if (ACTION_GET_OBB_PATCH_URL.equals(action)) {
+                String url = apk.getPatchObbUrl();
+                if (url != null) {
+                    intent.setData(Uri.parse(url));
+                    intent.putExtra(EXTRA_SHA256, apk.obbPatchFileSha256);
+                }
+                setResult(RESULT_OK, intent);
+            }
+        }
+        finish();
+    }
+}