register app for opening ss:// and socks5:// proxy URLs

also linkify proxy URLs in text messages

src/main/AndroidManifest.xml

@@ -252,7 +252,22 @@
     <activity android:name=".proxy.ProxySettingsActivity"
               android:label="@string/proxy_settings"
               android:windowSoftInputMode="stateHidden"
-              android:configChanges="touchscreen|keyboard|keyboardHidden|orientation|screenLayout|screenSize"/>
+              android:exported="true"
+              android:configChanges="touchscreen|keyboard|keyboardHidden|orientation|screenLayout|screenSize">
+
+        <intent-filter>
+            <action android:name="android.intent.action.VIEW"/>
+            <category android:name="android.intent.category.DEFAULT"/>
+            <category android:name="android.intent.category.BROWSABLE"/>
+            <!-- Android's scheme matcher is case-sensitive, so include most likely variations -->
+            <data android:scheme="ss" />
+            <data android:scheme="socks5" />
+            <data android:scheme="SOCKS5" tools:ignore="AppLinkUrlError" />
+            <data android:scheme="SS" tools:ignore="AppLinkUrlError" />
+        </intent-filter>
+
+    </activity>
+
 
     <activity android:name=".LogViewActivity"
               android:label="@string/pref_log_header"

src/main/java/org/thoughtcrime/securesms/components/emoji/EmojiTextView.java

@@ -213,6 +213,7 @@ public class EmojiTextView extends AppCompatTextView {
   // tools for linkify
 
   private static final Pattern CMD_PATTERN = Pattern.compile("(?<=^|\\s)/[a-zA-Z][a-zA-Z@\\d_/.-]{0,254}");
+  private static final Pattern PROXY_PATTERN = Pattern.compile("(?<=^|\\s)(SOCKS5|socks5|ss|SS):[^ \\n]+");
 
   private static void replaceURLSpan(SpannableString messageBody) {
     URLSpan[] urlSpans = messageBody.getSpans(0, messageBody.length(), URLSpan.class);
@@ -231,6 +232,10 @@ public class EmojiTextView extends AppCompatTextView {
       EmojiTextView.replaceURLSpan(messageBody); // replace URLSpan so that it is not removed on the next addLinks() call
     }
 
+    if (Linkify.addLinks(messageBody, PROXY_PATTERN, null, null, null)) {
+      EmojiTextView.replaceURLSpan(messageBody); // replace URLSpan so that it is not removed on the next addLinks() call
+    }
+
     // linkyfiy urls etc., this removes all existing URLSpan
     if (Linkify.addLinks(messageBody, Linkify.EMAIL_ADDRESSES|Linkify.WEB_URLS|Linkify.PHONE_NUMBERS)) {
       EmojiTextView.replaceURLSpan(messageBody);

src/main/java/org/thoughtcrime/securesms/proxy/ProxySettingsActivity.java

@@ -4,6 +4,7 @@ import static org.thoughtcrime.securesms.connect.DcHelper.CONFIG_PROXY_ENABLED;
 import static org.thoughtcrime.securesms.connect.DcHelper.CONFIG_PROXY_URL;
 
 import android.content.Intent;
+import android.net.Uri;
 import android.os.Bundle;
 import android.view.MenuItem;
 import android.view.View;
@@ -70,6 +71,14 @@ public class ProxySettingsActivity extends BaseActionBarActivity
     proxyList.addFooterView(footer);
     adapter.changeData(DcHelper.get(this, CONFIG_PROXY_URL));
     DcHelper.getEventCenter(this).addObserver(DcContext.DC_EVENT_CONNECTIVITY_CHANGED, this);
+
+    handleOpenProxyUrl();
+  }
+
+  @Override
+  protected void onNewIntent(Intent intent) {
+    super.onNewIntent(intent);
+    handleOpenProxyUrl();
   }
 
   @Override
@@ -173,6 +182,34 @@ public class ProxySettingsActivity extends BaseActionBarActivity
       .show();
   }
 
+  private void handleOpenProxyUrl() {
+    if (getIntent() != null && Intent.ACTION_VIEW.equals(getIntent().getAction())) {
+      Uri uri = getIntent().getData();
+      if (uri == null) {
+        return;
+      }
+
+      DcContext dcContext = DcHelper.getContext(this);
+      final DcLot qrParsed = dcContext.checkQr(uri.toString());
+      if (qrParsed.getState() == DcContext.DC_QR_PROXY) {
+        new AlertDialog.Builder(this)
+          .setTitle(R.string.proxy_use_proxy)
+          .setMessage(getString(R.string.proxy_use_proxy_confirm, qrParsed.getText1()))
+          .setPositiveButton(R.string.proxy_use_proxy, (dlg, btn) -> {
+              dcContext.setConfigFromQr(uri.toString());
+              dcContext.restartIo();
+              adapter.changeData(DcHelper.get(this, CONFIG_PROXY_URL));
+              proxySwitch.setChecked(DcHelper.getInt(this, CONFIG_PROXY_ENABLED) == 1);
+          })
+          .setNegativeButton(R.string.cancel, null)
+          .setCancelable(false)
+          .show();
+      } else {
+        Toast.makeText(this, R.string.proxy_invalid, Toast.LENGTH_LONG).show();
+      }
+    }
+  }
+
   @Override
   public void handleEvent(@NonNull DcEvent event) {
     if (event.getId() == DcContext.DC_EVENT_CONNECTIVITY_CHANGED) {

src/main/java/org/thoughtcrime/securesms/util/LongClickCopySpan.java

@@ -81,7 +81,14 @@ public class LongClickCopySpan extends ClickableSpan {
       QrCodeHandler qrCodeHandler = new QrCodeHandler((Activity) widget.getContext());
       qrCodeHandler.handleQrData(url);
     } else {
-      IntentUtils.showBrowserIntent(widget.getContext(), url);
+      Activity activity = (Activity) widget.getContext();
+      DcContext dcContext = DcHelper.getContext(activity);
+      if (dcContext.checkQr(url).getState() == DcContext.DC_QR_PROXY) {
+        QrCodeHandler qrCodeHandler = new QrCodeHandler(activity);
+        qrCodeHandler.handleQrData(url);
+      } else {
+        IntentUtils.showBrowserIntent(widget.getContext(), url);
+      }
     }
   }