Support tox-uris in the form tox://0123ABCD?name=robin&message=hello

`tox:0123ABCD` is still supported, but it can't have query-parameters as
it's an opaque uri. `tox://0123ABCD` is a hierarchical uri and supports
all the fancy features.

Author: robinlinden

atox/src/main/kotlin/MainActivity.kt

@@ -19,11 +19,41 @@ import javax.inject.Inject
 import ltd.evilcorp.atox.di.ViewModelFactory
 import ltd.evilcorp.atox.settings.Settings
 import ltd.evilcorp.atox.ui.contactlist.ARG_SHARE
+import ltd.evilcorp.domain.tox.ToxID
 
 private const val TAG = "MainActivity"
-private const val TOX_ID_LENGTH = 76
 
-private fun isToxUri(uri: Uri) = uri.isOpaque && uri.scheme == "tox" && uri.schemeSpecificPart.length == TOX_ID_LENGTH
+// TODO(robinlinden): Move to common place, use for QR-code-provided uris as well.
+data class ToxUri(val toxId: ToxID, val nameSuggestion: String? = null, val messageSuggestion: String? = null) {
+    companion object {
+        private const val TOX_ID_LENGTH = 76
+
+        fun parseFrom(uri: Uri?): ToxUri? {
+            if (uri == null) {
+                return null
+            }
+
+            if (uri.scheme != "tox") {
+                return null
+            }
+
+            if (uri.isOpaque) {
+                if (uri.schemeSpecificPart.length != TOX_ID_LENGTH) {
+                    return null
+                }
+
+                return ToxUri(ToxID(uri.schemeSpecificPart))
+            }
+
+            val maybeToxId = uri.host
+            if (maybeToxId?.length != TOX_ID_LENGTH) {
+                return null
+            }
+
+            return ToxUri(ToxID(maybeToxId), uri.getQueryParameter("name"), uri.getQueryParameter("message"))
+        }
+    }
+}
 
 class MainActivity : AppCompatActivity() {
     @Inject
@@ -85,14 +115,19 @@ class MainActivity : AppCompatActivity() {
     private fun handleToxLinkIntent(intent: Intent) {
         val data = intent.data
         Log.i(TAG, "Got uri with data: $data")
-        if (data == null || !isToxUri(data)) {
+        val toxUri = ToxUri.parseFrom(data)
+        if (toxUri == null) {
             Log.e(TAG, "Got malformed uri: $data")
             return
         }
 
         supportFragmentManager.findFragmentById(R.id.nav_host_fragment)?.findNavController()?.navigate(
             R.id.addContactFragment,
-            bundleOf("toxId" to data.schemeSpecificPart),
+            bundleOf(
+                "toxId" to toxUri.toxId.string(),
+                "name" to toxUri.nameSuggestion,
+                "message" to toxUri.messageSuggestion,
+            ),
         )
     }
 

atox/src/main/kotlin/ui/addcontact/AddContactFragment.kt

@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: 2019-2024 Robin Lindén <dev@robinlinden.eu>
+// SPDX-FileCopyrightText: 2019-2025 Robin Lindén <dev@robinlinden.eu>
 // SPDX-FileCopyrightText: 2020 aTox contributors
 //
 // SPDX-License-Identifier: GPL-3.0-only
@@ -134,5 +134,11 @@ class AddContactFragment : BaseFragment<FragmentAddContactBinding>(FragmentAddCo
         add.isEnabled = false
 
         toxId.setText(arguments?.getString("toxId"), TextView.BufferType.EDITABLE)
+        val messageSuggestion = arguments?.getString("message")
+        if (messageSuggestion != null) {
+            message.setText(messageSuggestion)
+        }
+
+        // TODO(robinlinden): Hook up the nickname suggestion once we have nicknames.
     }
 }