From a7efacaeb64a5b5e44f98f3032fdd23434041098 Mon Sep 17 00:00:00 2001
From: Christophe Deschamps
 <christophe.deschamps@belledonne-communications.com>
Date: Wed, 4 Dec 2024 13:38:50 +0100
Subject: [PATCH] Transfer a call via DTMF

---
 .../data/ContactNumberOrAddressData.kt        | 11 ++++++-
 .../contact/viewmodels/ContactViewModel.kt    | 30 +++++++++++++++++--
 .../java/org/linphone/core/CorePreferences.kt |  3 ++
 .../main/res/layout/contact_detail_cell.xml   | 12 ++++++++
 4 files changed, 53 insertions(+), 3 deletions(-)

diff --git a/app/src/main/java/org/linphone/activities/main/contact/data/ContactNumberOrAddressData.kt b/app/src/main/java/org/linphone/activities/main/contact/data/ContactNumberOrAddressData.kt
index 93f709d5e..a1a77267c 100644
--- a/app/src/main/java/org/linphone/activities/main/contact/data/ContactNumberOrAddressData.kt
+++ b/app/src/main/java/org/linphone/activities/main/contact/data/ContactNumberOrAddressData.kt
@@ -19,6 +19,7 @@
  */
 package org.linphone.activities.main.contact.data
 
+import androidx.lifecycle.MutableLiveData
 import org.linphone.LinphoneApplication.Companion.corePreferences
 import org.linphone.core.Address
 
@@ -29,7 +30,8 @@ class ContactNumberOrAddressData(
     val isSip: Boolean = true,
     val showSecureChat: Boolean = false,
     val typeLabel: String = "",
-    private val listener: ContactNumberOrAddressClickListener
+    private val listener: ContactNumberOrAddressClickListener,
+    val dtmfTransferAllowed: MutableLiveData<Boolean>
 ) {
     val showInvite = !hasPresence && !isSip && corePreferences.showContactInviteBySms
 
@@ -50,6 +52,11 @@ class ContactNumberOrAddressData(
     fun smsInvite() {
         listener.onSmsInvite(displayedValue)
     }
+
+    fun dtmfTransferTo() {
+        address ?: return
+        listener.transferViaDtmfTo(address.username!!)
+    }
 }
 
 interface ContactNumberOrAddressClickListener {
@@ -58,4 +65,6 @@ interface ContactNumberOrAddressClickListener {
     fun onChat(address: Address, isSecured: Boolean)
 
     fun onSmsInvite(number: String)
+
+    fun transferViaDtmfTo(username: String)
 }
diff --git a/app/src/main/java/org/linphone/activities/main/contact/viewmodels/ContactViewModel.kt b/app/src/main/java/org/linphone/activities/main/contact/viewmodels/ContactViewModel.kt
index 68ac85ace..99fda599e 100644
--- a/app/src/main/java/org/linphone/activities/main/contact/viewmodels/ContactViewModel.kt
+++ b/app/src/main/java/org/linphone/activities/main/contact/viewmodels/ContactViewModel.kt
@@ -83,6 +83,20 @@ class ContactViewModel(friend: Friend) : MessageNotifierViewModel(), ContactData
 
     val hasLongTermPresence = MutableLiveData<Boolean>()
 
+    val dtmfTransferAllowed = MutableLiveData(
+        !corePreferences.transferDtmfCode.isEmpty() && coreContext.core.currentCall != null
+    )
+
+    private val coreListener: CoreListenerStub = object : CoreListenerStub() {
+        override fun onCallStateChanged(
+            core: Core,
+            call: Call,
+            state: Call.State?,
+            message: String
+        ) {
+            dtmfTransferAllowed.value = !corePreferences.transferDtmfCode.isEmpty() && coreContext.core.currentCall != null
+        }
+    }
     private val chatRoomListener = object : ChatRoomListenerStub() {
         override fun onStateChanged(chatRoom: ChatRoom, state: ChatRoom.State) {
             if (state == ChatRoom.State.Created) {
@@ -138,6 +152,14 @@ class ContactViewModel(friend: Friend) : MessageNotifierViewModel(), ContactData
         override fun onSmsInvite(number: String) {
             sendSmsToEvent.value = Event(number)
         }
+
+        override fun transferViaDtmfTo(username: String) {
+            val dtmfs = corePreferences.transferDtmfCode.replace("\${extension}", username)
+            coreContext.core.currentCall?.also { call ->
+                Log.i("Transferring call ${call.callLog.callId} via DTMFs: $dtmfs")
+                call.sendDtmfs(dtmfs)
+            }
+        }
     }
 
     init {
@@ -154,9 +176,11 @@ class ContactViewModel(friend: Friend) : MessageNotifierViewModel(), ContactData
             presenceStatus.value = it.consolidatedPresence
             hasLongTermPresence.value = it.hasLongTermPresence()
         }
+        coreContext.core.addListener(coreListener)
     }
 
     override fun onCleared() {
+        coreContext.core.removeListener(coreListener)
         destroy()
         super.onCleared()
     }
@@ -223,7 +247,8 @@ class ContactViewModel(friend: Friend) : MessageNotifierViewModel(), ContactData
                 hasPresence,
                 displayValue,
                 showSecureChat = secureChatAllowed,
-                listener = listener
+                listener = listener,
+                dtmfTransferAllowed = dtmfTransferAllowed
             )
             list.add(noa)
         }
@@ -262,7 +287,8 @@ class ContactViewModel(friend: Friend) : MessageNotifierViewModel(), ContactData
                 isSip = false,
                 showSecureChat = secureChatAllowed,
                 typeLabel = label,
-                listener = listener
+                listener = listener,
+                dtmfTransferAllowed = dtmfTransferAllowed
             )
             list.add(noa)
         }
diff --git a/app/src/main/java/org/linphone/core/CorePreferences.kt b/app/src/main/java/org/linphone/core/CorePreferences.kt
index eba48e42a..9be10975a 100644
--- a/app/src/main/java/org/linphone/core/CorePreferences.kt
+++ b/app/src/main/java/org/linphone/core/CorePreferences.kt
@@ -274,6 +274,9 @@ class CorePreferences constructor(private val context: Context) {
 
     /* Call */
 
+    val transferDtmfCode: String
+        get() = config.getString("app", "transfer_dtmf_code", "")!!
+
     var sendEarlyMedia: Boolean
         get() = config.getBool("sip", "outgoing_calls_early_media", false)
         set(value) {
diff --git a/app/src/main/res/layout/contact_detail_cell.xml b/app/src/main/res/layout/contact_detail_cell.xml
index f07e7a3c3..35741fc92 100644
--- a/app/src/main/res/layout/contact_detail_cell.xml
+++ b/app/src/main/res/layout/contact_detail_cell.xml
@@ -99,6 +99,18 @@
                 android:background="@drawable/round_orange_button_background"
                 android:src="@drawable/call_start_default" />
 
+            <ImageView
+                android:onClick="@{() -> data.dtmfTransferTo()}"
+                android:enabled="@{data.address != null}"
+                android:contentDescription="@string/content_description_transfer_call"
+                android:visibility="@{data.dtmfTransferAllowed ? View.VISIBLE : View.GONE}"
+                android:layout_width="60dp"
+                android:layout_height="60dp"
+                android:layout_margin="10dp"
+                android:padding="10dp"
+                android:background="@drawable/round_orange_button_background"
+                android:src="@drawable/call_transfer" />
+
             <ImageView
                 android:onClick="@{() -> data.startChat(false)}"
                 android:enabled="@{data.address != null}"