Add proposal about send action in Linking

proposals/0000-linking-send-action.md

@@ -0,0 +1,69 @@
+---
+title: Add support for Intent.SEND_ACTION in Linking
+author:
+- Adam Georgsson
+date: 2023-10-03
+---
+
+# RFC0000: Add support for SEND intent action in Linking
+
+## Summary
+
+Linking have support for collecting uri from the VIEW intent action in Android. 
+This proposal extends the functionality to also support SEND intent.
+
+## Motivation
+
+The use cases of SEND and VIEW are similar. Let's say my app is associated with opening image files. 
+The Linking library will handle images opened from the file explorer in Android, but not if I open the image in another
+image viewer and then press share to my app.
+
+## Detailed design
+
+This is an example of how it could be done in ReactInstanceManager.java:onNewIntent. 
+A similar solution should be done in IntentModule.java:getInitialURL.
+
+    /** This method will give JS the opportunity to receive intents via Linking. */
+    @ThreadConfined(UI)
+    public void onNewIntent(Intent intent) {
+        UiThreadUtil.assertOnUiThread();
+        ReactContext currentContext = getCurrentReactContext();
+        if (currentContext == null) {
+            FLog.w(TAG, "Instance detached from instance manager");
+        } else {
+            String action = intent.getAction();
+            Uri uri;
+            if (Intent.ACTION_VIEW.equals(action) || NfcAdapter.ACTION_NDEF_DISCOVERED.equals(action)) {
+                uri = intent.getData();
+            } else if (Intent.ACTION_SEND.equals(action)) {
+                uri = (Uri)intent.getParcelableExtra(Intent.EXTRA_STREAM);
+            }
+
+            if (uri != null) {
+                DeviceEventManagerModule deviceEventManagerModule =
+                    currentContext.getNativeModule(DeviceEventManagerModule.class);
+                if (deviceEventManagerModule != null) {
+                    deviceEventManagerModule.emitNewIntentReceived(uri);
+                }
+            }
+            currentContext.onNewIntent(mCurrentActivity, intent);
+        }
+    }
+## Drawbacks
+
+It may cause trouble if a project already have a solution to for handling uri from SEND actions but also using the 
+Linking library for handling VIEW actions. Then they would handle each SEND action twice.
+
+## Alternatives
+
+I have thought of handling the SEND events in my own code and convert them to an url event that the Linking can handle.
+I don't know if it would work, but it feels hacky.
+
+## Unresolved questions
+
+* I have not been able to test the design directly in Linking library because I did not succeed to build from source.
+The concept is however already in play in another local library.
+
+* There is also a SEND_MULTIPLE action when you share multiple files which I have not taken in consideration.
+
+* I don't know anything about how it works in iOS. It might create a gap in functionality between the two operating systems.