From 7014d825b2661d5759b31a66522f6abde72cba3d Mon Sep 17 00:00:00 2001
From: David Woodhouse <dwmw@amazon.co.uk>
Date: Thu, 22 Mar 2018 21:05:28 +0000
Subject: [PATCH 7/7] Create transient IM buddies for accounts which can cope

We need a PurpleBuddy in order for full names (aliases), presence status
and photos to be displayed for IM peers that aren't otherwise in the
buddy list. Doing it in libpurple is a whole lot saner than having the
PRPL hook into "conversation-created" and "deleting-conversation" signals
and trying to create them for itself.
---
 libpurple/conversation.c | 53 ++++++++++++++++++++++++++++++++++++++++++++++++
 libpurple/prpl.h         |  9 +++++++-
 2 files changed, 61 insertions(+), 1 deletion(-)

diff --git a/libpurple/conversation.c b/libpurple/conversation.c
index 7293804..26c60f6 100644
--- a/libpurple/conversation.c
+++ b/libpurple/conversation.c
@@ -327,6 +327,55 @@ purple_conversation_chat_cleanup_for_rejoin(PurpleConversation *conv)
 	purple_conversation_update(conv, PURPLE_CONV_UPDATE_CHATLEFT);
 }
 
+/* Meaningful name in case a UI doesn't actually honour the INVISIBLE flag */
+#define TRANSIENT_GROUP_NAME _("(internal) Temporary IM peers")
+
+static void
+purple_conversation_ensure_buddy(PurpleAccount *account, PurpleConnection *gc,
+				 const char *name)
+{
+	PurplePluginProtocolInfo *prpl_info;
+	PurpleBuddy *buddy;
+	PurpleGroup *group;
+
+	prpl_info = PURPLE_PLUGIN_PROTOCOL_INFO(purple_connection_get_prpl(gc));
+
+	if ((prpl_info->options & OPT_PROTO_TRANSIENT_BUDDIES) &&
+	    !purple_find_buddy(account, name)) {
+		group = purple_find_group(TRANSIENT_GROUP_NAME);
+		if (!group) {
+			group = purple_group_new(TRANSIENT_GROUP_NAME);
+			purple_blist_node_set_flags(PURPLE_BLIST_NODE(group),
+						    PURPLE_BLIST_NODE_FLAG_NO_SAVE | PURPLE_BLIST_NODE_FLAG_INVISIBLE);
+			purple_blist_add_group(group, NULL);
+		}
+		buddy = purple_buddy_new(account, name, NULL);
+		purple_blist_node_set_flags(PURPLE_BLIST_NODE(buddy),
+					    PURPLE_BLIST_NODE_FLAG_NO_SAVE | PURPLE_BLIST_NODE_FLAG_INVISIBLE);
+
+		purple_blist_add_buddy(buddy, NULL, group, NULL);
+		purple_account_add_buddy(account, buddy);
+	}
+}
+
+static void
+purple_conversation_release_buddy(PurpleAccount *account, const char *name)
+{
+	PurpleBuddy *buddy;
+	PurpleGroup *group;
+
+	group = purple_find_group(TRANSIENT_GROUP_NAME);
+	if (!group)
+		return;
+
+	buddy = purple_find_buddy_in_group(account, name, group);
+	if (!buddy)
+		return;
+
+	purple_account_remove_buddy(account, buddy, group);
+	purple_blist_remove_buddy(buddy);
+}
+
 PurpleConversation *
 purple_conversation_new(PurpleConversationType type, PurpleAccount *account,
 					  const char *name)
@@ -403,6 +452,8 @@ purple_conversation_new(PurpleConversationType type, PurpleAccount *account,
 			purple_conversation_set_logging(conv, TRUE);
 			open_log(conv);
 		}
+
+		purple_conversation_ensure_buddy(account, gc, name);
 	}
 	else if (type == PURPLE_CONV_TYPE_CHAT)
 	{
@@ -484,6 +535,8 @@ purple_conversation_destroy(PurpleConversation *conv)
 
 			if (gc && prpl_info->convo_closed != NULL)
 				prpl_info->convo_closed(gc, name);
+
+			purple_conversation_release_buddy(conv->account, conv->name);
 		}
 		else if (purple_conversation_get_type(conv) == PURPLE_CONV_TYPE_CHAT)
 		{
diff --git a/libpurple/prpl.h b/libpurple/prpl.h
index b1b20d0..c7af634 100644
--- a/libpurple/prpl.h
+++ b/libpurple/prpl.h
@@ -209,7 +209,14 @@ typedef enum
 	 * along with an invitation.
 	 * @since 2.8.0
 	 */
-	OPT_PROTO_INVITE_MESSAGE = 0x00000800
+	OPT_PROTO_INVITE_MESSAGE = 0x00000800,
+
+	/**
+	 * Indicates that this protocol supports creating invisible buddies for
+	 * reporting presence/alias of IM peers.
+	 * @since 2.14.0
+	 */
+	OPT_PROTO_TRANSIENT_BUDDIES = 0x00001000,
 
 } PurpleProtocolOptions;
 
-- 
2.7.4