CallLink treatment for ConversationItem.

app/src/main/java/org/thoughtcrime/securesms/calls/links/CallLinkJoinButton.kt

@@ -0,0 +1,28 @@
+/*
+ * Copyright 2023 Signal Messenger, LLC
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+package org.thoughtcrime.securesms.calls.links
+
+import android.content.Context
+import android.util.AttributeSet
+import androidx.appcompat.widget.LinearLayoutCompat
+import com.google.android.material.button.MaterialButton
+import org.thoughtcrime.securesms.R
+
+class CallLinkJoinButton @JvmOverloads constructor(
+  context: Context,
+  attrs: AttributeSet? = null
+) : LinearLayoutCompat(context, attrs) {
+  init {
+    orientation = VERTICAL
+    inflate(context, R.layout.call_link_join_button, this)
+  }
+
+  private val joinButton: MaterialButton = findViewById(R.id.join_button)
+
+  fun setJoinClickListener(onClickListener: OnClickListener) {
+    joinButton.setOnClickListener(onClickListener)
+  }
+}

app/src/main/java/org/thoughtcrime/securesms/calls/links/CallLinks.kt

@@ -21,10 +21,11 @@ import java.net.URLDecoder
  */
 object CallLinks {
   private const val ROOT_KEY = "key"
+  private const val LINK_PREFIX = "https://signal.link/call/#key="
 
   private val TAG = Log.tag(CallLinks::class.java)
 
-  fun url(linkKeyBytes: ByteArray) = "https://signal.link/call/#key=${Hex.dump(linkKeyBytes)}"
+  fun url(linkKeyBytes: ByteArray) = "$LINK_PREFIX${Hex.dump(linkKeyBytes)}"
 
   fun watchCallLink(roomId: CallLinkRoomId): Observable<CallLinkTable.CallLink> {
     return Observable.create { emitter ->
@@ -51,6 +52,10 @@ object CallLinks {
 
   @JvmStatic
   fun parseUrl(url: String): CallLinkRootKey? {
+    if (!url.startsWith(LINK_PREFIX)) {
+      return null
+    }
+
     val parts = url.split("#")
     if (parts.size != 2) {
       Log.w(TAG, "Invalid fragment delimiter count in url.")