accept froidrepo and fdroidrepos URIs, which can be scanned via QRCode, etc

This patch makes F-Droid register with Android that it accepts the URI
schemes of fdroidrepo (HTTP) and fdroidrepos(HTTPS).  When F-Droid receives
one of these URIs, it launches the ManageRepo Activity and then launches
the New Repository dialog.

refs #2454

AndroidManifest.xml

@@ -71,6 +71,18 @@
             <meta-data
                 android:name="android.support.PARENT_ACTIVITY"
                 android:value=".FDroid" />
+            <intent-filter>
+                <action android:name="android.intent.action.VIEW" />
+
+                <category android:name="android.intent.category.BROWSABLE" />
+                <category android:name="android.intent.category.DEFAULT" />
+
+                <!-- Android's scheme matcher is case-sensitive, so include most likely variations -->
+                <data android:scheme="fdroidrepo" />
+                <data android:scheme="FDROIDREPO" />
+                <data android:scheme="fdroidrepos" />
+                <data android:scheme="FDROIDREPOS" />
+            </intent-filter>
         </activity>
 
         <activity

src/org/fdroid/fdroid/ManageRepo.java

@@ -25,6 +25,7 @@ import java.util.Date;
 import java.util.Formatter;
 import java.util.HashMap;
 import java.util.List;
+import java.util.Locale;
 import java.util.Map;
 
 import android.app.AlertDialog;
@@ -33,6 +34,7 @@ import android.app.ListActivity;
 import android.content.DialogInterface;
 import android.content.Intent;
 import android.content.SharedPreferences;
+import android.net.Uri;
 import android.os.Bundle;
 import android.preference.PreferenceManager;
 import android.text.format.DateFormat;
@@ -106,6 +108,23 @@ public class ManageRepo extends ListActivity {
 
         reposToRemove = new ArrayList<String>();
         reposToDisable = new ArrayList<String>();
+
+        /* let's see if someone is trying to send us a new repo */
+        Intent intent = getIntent();
+        /* an URL from a click or a QRCode scan */
+        Uri uri = intent.getData();
+        if (uri != null) {
+            // scheme should only ever be pure ASCII:
+            String scheme = intent.getScheme().toLowerCase(Locale.ENGLISH);
+            String fingerprint = uri.getUserInfo();
+            if (scheme.equals("fdroidrepos") || scheme.equals("fdroidrepo")
+                    || scheme.equals("https") || scheme.equals("http")) {
+                String uriString = uri.toString().replace("fdroidrepo", "http").
+                        replace(fingerprint + "@", "");
+                showAddRepo(uriString);
+                Log.i("ManageRepo", uriString + " fingerprint: " + fingerprint);
+            }
+        }
     }
 
     @Override
@@ -211,23 +230,23 @@ public class ManageRepo extends ListActivity {
         return super.onOptionsItemSelected(item);
     }
 
-    @Override
+    private void showAddRepo(String uriString) {
-    public boolean onMenuItemSelected(int featureId, MenuItem item) {
-
-        super.onMenuItemSelected(featureId, item);
         LayoutInflater li = LayoutInflater.from(this);
-
-        switch (item.getItemId()) {
-        case ADD_REPO:
         View view = li.inflate(R.layout.addrepo, null);
         Builder p = new AlertDialog.Builder(this).setView(view);
         final AlertDialog alrt = p.create();
 
+        if (uriString != null) {
+            EditText uriEditText = (EditText) view.findViewById(R.id.edit_uri);
+            uriEditText.setText(uriString);
+        }
+
         alrt.setIcon(android.R.drawable.ic_menu_add);
         alrt.setTitle(getString(R.string.repo_add_title));
         alrt.setButton(DialogInterface.BUTTON_POSITIVE,
                 getString(R.string.repo_add_add),
                 new DialogInterface.OnClickListener() {
+                    @Override
                     public void onClick(DialogInterface dialog, int which) {
                         EditText uri = (EditText) alrt
                                 .findViewById(R.id.edit_uri);
@@ -240,11 +259,22 @@ public class ManageRepo extends ListActivity {
         alrt.setButton(DialogInterface.BUTTON_NEGATIVE,
                 getString(R.string.cancel),
                 new DialogInterface.OnClickListener() {
+                    @Override
                     public void onClick(DialogInterface dialog, int which) {
                         return;
                     }
                 });
         alrt.show();
+    }
+
+    @Override
+    public boolean onMenuItemSelected(int featureId, MenuItem item) {
+
+        super.onMenuItemSelected(featureId, item);
+
+        switch (item.getItemId()) {
+        case ADD_REPO:
+            showAddRepo(null);
             return true;
 
         case REM_REPO: