diff -r 23985cfb6b99 -r 12b38cca63d7 pidgin/pidgincredentialspage.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/pidgin/pidgincredentialspage.c	Sun Jan 24 05:27:03 2021 -0600
@@ -0,0 +1,182 @@
+/*
+ * Pidgin - Internet Messenger
+ * Copyright (C) Pidgin Developers <devel@pidgin.im>
+ *
+ * Pidgin is the legal property of its developers, whose names are too numerous
+ * to list here.  Please refer to the COPYRIGHT file distributed with this
+ * source distribution.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <purple.h>
+
+#include "pidgincredentialspage.h"
+
+#include "pidgincredentialproviderstore.h"
+
+struct _PidginCredentialsPage {
+	GtkBox parent;
+
+	GtkWidget *combo;
+};
+
+G_DEFINE_TYPE(PidginCredentialsPage, pidgin_credentials_page,
+              GTK_TYPE_BOX)
+
+/******************************************************************************
+ * Helpers
+ *****************************************************************************/
+static void
+pidgin_credentials_page_combo_changed_cb(GtkComboBox *widget, gpointer data) {
+	PidginCredentialsPage *page = PIDGIN_CREDENTIALS_PAGE(data);
+	GtkTreeIter iter;
+
+	if(gtk_combo_box_get_active_iter(GTK_COMBO_BOX(page->combo), &iter)) {
+		PurpleCredentialManager *manager = NULL;
+		GError *error = NULL;
+		GtkTreeModel *model = NULL;
+		gchar *id = NULL;
+
+		model = gtk_combo_box_get_model(GTK_COMBO_BOX(page->combo));
+
+		gtk_tree_model_get(model, &iter,
+		                   PIDGIN_CREDENTIAL_PROVIDER_STORE_COLUMN_ID, &id,
+		                   -1);
+
+		manager = purple_credential_manager_get_default();
+		if(purple_credential_manager_set_active_provider(manager, id, &error)) {
+			purple_prefs_set_string("/purple/credentials/active-provider", id);
+
+			g_free(id);
+
+			return;
+		}
+
+		purple_debug_warning("credentials-page", "failed to set the active "
+		                     "credential provider to '%s': %s",
+		                     id,
+		                     error ? error->message : "unknown error");
+
+		g_free(id);
+		g_clear_error(&error);
+	}
+}
+
+static void
+pidgin_credentials_page_set_active_provider(PidginCredentialsPage *page,
+                                            const gchar *new_id)
+{
+	GtkTreeIter iter;
+	GtkTreeModel *model = NULL;
+
+	model = gtk_combo_box_get_model(GTK_COMBO_BOX(page->combo));
+
+	if(gtk_tree_model_get_iter_first(model, &iter)) {
+		do {
+			gchar *id = NULL;
+
+			gtk_tree_model_get(model, &iter,
+			                   PIDGIN_CREDENTIAL_PROVIDER_STORE_COLUMN_ID, &id,
+			                   -1);
+
+			if(purple_strequal(new_id, id)) {
+				g_signal_handlers_block_by_func(page->combo,
+				                                pidgin_credentials_page_combo_changed_cb,
+				                                page);
+
+				gtk_combo_box_set_active_iter(GTK_COMBO_BOX(page->combo),
+				                              &iter);
+
+				g_signal_handlers_unblock_by_func(page->combo,
+				                                  pidgin_credentials_page_combo_changed_cb,
+				                                  page);
+
+				g_free(id);
+
+				return;
+			}
+
+			g_free(id);
+		} while(gtk_tree_model_iter_next(model, &iter));
+	}
+}
+
+static void
+pidgin_credentials_page_active_provider_changed_cb(const gchar *name,
+                                                   PurplePrefType type,
+                                                   gconstpointer value,
+                                                   gpointer data)
+{
+	PidginCredentialsPage *page = PIDGIN_CREDENTIALS_PAGE(data);
+
+	pidgin_credentials_page_set_active_provider(page, (const gchar *)value);
+}
+
+/******************************************************************************
+ * GObjectImplementation
+ *****************************************************************************/
+static void
+pidgin_credentials_page_finalize(GObject *obj) {
+	purple_prefs_disconnect_by_handle(obj);
+
+	G_OBJECT_CLASS(pidgin_credentials_page_parent_class)->finalize(obj);
+}
+
+static void
+pidgin_credentials_page_init(PidginCredentialsPage *page) {
+	const gchar *active = NULL;
+
+	gtk_widget_init_template(GTK_WIDGET(page));
+
+	purple_prefs_add_none("/purple/credentials");
+	purple_prefs_add_string("/purple/credentials/active-provider", NULL);
+
+	purple_prefs_connect_callback(page, "/purple/credentials/active-provider",
+	                              pidgin_credentials_page_active_provider_changed_cb,
+	                              page);
+
+	g_signal_connect(G_OBJECT(page->combo), "changed",
+	                 G_CALLBACK(pidgin_credentials_page_combo_changed_cb),
+	                 page);
+
+	active = purple_prefs_get_string("/purple/credentials/active-provider");
+	if(active != NULL) {
+		pidgin_credentials_page_set_active_provider(page, active);
+	}
+}
+
+static void
+pidgin_credentials_page_class_init(PidginCredentialsPageClass *klass) {
+	GObjectClass *obj_class = G_OBJECT_CLASS(klass);
+	GtkWidgetClass *widget_class = GTK_WIDGET_CLASS(klass);
+
+	obj_class->finalize = pidgin_credentials_page_finalize;
+
+	gtk_widget_class_set_template_from_resource(
+	    widget_class,
+	    "/im/pidgin/Pidgin/Prefs/credentials.ui"
+	);
+
+	gtk_widget_class_bind_template_child(widget_class, PidginCredentialsPage,
+	                                     combo);
+}
+
+/******************************************************************************
+ * API
+ *****************************************************************************/
+GtkWidget *
+pidgin_credentials_page_new(void) {
+	return GTK_WIDGET(g_object_new(PIDGIN_TYPE_CREDENTIALS_PAGE, NULL));
+}