[firebase_dynamic_links] Add support of expanding from short links

packages/firebase_dynamic_links/android/src/main/java/io/flutter/plugins/firebasedynamiclinks/FirebaseDynamicLinksPlugin.java

@@ -92,6 +92,9 @@ public void onMethodCall(MethodCall call, Result result) {
         builder.setLongLink(url);
         buildShortDynamicLink(builder, call, createShortLinkListener(result));
         break;
+      case "FirebaseDynamicLinks#getDynamicLink":
+        handleGetDynamicLink(result, Uri.parse((String) call.argument("url")));
+        break;
       case "FirebaseDynamicLinks#getInitialLink":
         handleGetInitialDynamicLink(result);
         break;
@@ -114,6 +117,32 @@ private Map<String, Object> getMapFromPendingDynamicLinkData(
     return dynamicLink;
   }
 
+  private void handleGetDynamicLink(final Result result, Uri uri) {
+    FirebaseDynamicLinks.getInstance()
+        .getDynamicLink(uri)
+        .addOnSuccessListener(
+            new OnSuccessListener<PendingDynamicLinkData>() {
+              @Override
+              public void onSuccess(PendingDynamicLinkData pendingDynamicLinkData) {
+                if (pendingDynamicLinkData != null) {
+                  Uri link = pendingDynamicLinkData.getLink();
+                  if (link != null) {
+                    result.success(link.toString());
+                    return;
+                  }
+                }
+                result.success(null);
+              }
+            })
+        .addOnFailureListener(
+            new OnFailureListener() {
+              @Override
+              public void onFailure(@NonNull Exception e) {
+                result.error(e.getClass().getSimpleName(), e.getMessage(), null);
+              }
+            });
+  }
+
   private void handleGetInitialDynamicLink(final Result result) {
     // If there's no activity, then there's no initial dynamic link.
     if (registrar.activity() == null) {

packages/firebase_dynamic_links/ios/Classes/FirebaseDynamicLinksPlugin.m

@@ -99,6 +99,19 @@ - (void)handleMethodCall:(FlutterMethodCall *)call result:(FlutterResult)result
     } else {
       result(dict);
     }
+  } else if ([@"FirebaseDynamicLinks#getDynamicLink" isEqualToString:call.method]) {
+    NSURL *shortLink = [NSURL URLWithString:call.arguments[@"url"]];
+    FIRDynamicLinkUniversalLinkHandler completion =
+        ^(FIRDynamicLink *_Nullable dynamicLink, NSError *_Nullable error) {
+          if (error) {
+            result(getFlutterError(error));
+          } else if (dynamicLink && dynamicLink.url) {
+            result([dynamicLink.url absoluteString]);
+          } else {
+            result(nil);
+          }
+        };
+    [[FIRDynamicLinks dynamicLinks] handleUniversalLink:shortLink completion:completion];
   } else {
     result(FlutterMethodNotImplemented);
   }

packages/firebase_dynamic_links/lib/src/firebase_dynamic_links.dart

@@ -37,6 +37,16 @@ class FirebaseDynamicLinks {
     return getPendingDynamicLinkDataFromMap(linkData);
   }
 
+  Future<Uri> getDynamicLink(Uri url) async {
+    final String reply = await FirebaseDynamicLinks.channel
+        .invokeMethod<String>('FirebaseDynamicLinks#getDynamicLink',
+            <String, dynamic>{'url': url.toString()});
+    if (reply == null) {
+      return null;
+    }
+    return Uri.tryParse(reply);
+  }
+
   PendingDynamicLinkData getPendingDynamicLinkDataFromMap(
       Map<dynamic, dynamic> linkData) {
     if (linkData == null) return null;

packages/firebase_dynamic_links/test/firebase_dynamic_links_test.dart

@@ -39,6 +39,8 @@ void main() {
                 'minimumVersion': 'Version 12',
               },
             };
+          case 'FirebaseDynamicLinks#getDynamicLink':
+            return 'https://google.com';
           default:
             return null;
         }
@@ -65,6 +67,21 @@ void main() {
       ]);
     });
 
+    test('getDynamicLink', () async {
+      final Uri argument = Uri.parse('short-link');
+      final Uri url =
+          await FirebaseDynamicLinks.instance.getDynamicLink(argument);
+
+      expect(url.host, 'google.com');
+
+      expect(log, <Matcher>[
+        isMethodCall('FirebaseDynamicLinks#getDynamicLink',
+            arguments: <String, dynamic>{
+              'url': argument.toString(),
+            })
+      ]);
+    });
+
     group('$DynamicLinkParameters', () {
       test('shortenUrl', () async {
         final Uri url = Uri.parse('google.com');