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[evolution-data-server/account-mgmt: 38/42] Add 'online-accounts' module.

commit 340099e66f3bd102a04a49974a627a8b4842b2ff
Author: Matthew Barnes <mbarnes redhat com>
Date:   Sun Apr 1 15:02:27 2012 -0400

    Add 'online-accounts' module.
    
    This replaces the 'online-accounts' module in Evolution.

 Makefile.am                                      |    2 +-
 configure.ac                                     |    5 +
 modules/Makefile.am                              |   11 +
 modules/online-accounts/Makefile.am              |   28 +
 modules/online-accounts/module-online-accounts.c |  736 ++++++++++++++++++++++
 5 files changed, 781 insertions(+), 1 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index 1d619ff..de2e6c5 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -2,7 +2,7 @@ ACLOCAL_AMFLAGS=-I m4
 
 DISTCHECK_CONFIGURE_FLAGS = --enable-gtk-doc --with-krb5=/usr --without-weather --enable-introspection
 
-SUBDIRS = camel data private libedataserver libebackend addressbook calendar libedataserverui services tests docs art po
+SUBDIRS = camel data private libedataserver libebackend addressbook calendar libedataserverui modules services tests docs art po
 
 if HAVE_INTROSPECTION
 if HAVE_VALA
diff --git a/configure.ac b/configure.ac
index c60923e..2beb016 100644
--- a/configure.ac
+++ b/configure.ac
@@ -45,6 +45,9 @@ m4_define([libgdata_minimum_version], [0.10])
 m4_define([oauth_minimum_version], [0.9.4])
 m4_define([sqlite_minimum_version], [3.5])
 m4_define([libical_minimum_version], [0.43])
+
+dnl Optional Packages
+m4_define([goa_minimum_version], [3.1.1])
 m4_define([gweather_minimum_version], [2.90.0])
 
 AC_SUBST([BASE_VERSION],[base_version])
@@ -1655,6 +1658,8 @@ libedataserver/eds-version.h
 libedataserver/libedataserver.pc
 libedataserverui/Makefile
 libedataserverui/libedataserverui.pc
+modules/Makefile
+modules/online-accounts/Makefile
 private/Makefile
 services/Makefile
 services/evolution-addressbook-factory/Makefile
diff --git a/modules/Makefile.am b/modules/Makefile.am
new file mode 100644
index 0000000..6f7cf42
--- /dev/null
+++ b/modules/Makefile.am
@@ -0,0 +1,11 @@
+NULL =
+
+if HAVE_GOA
+ONLINE_ACCOUNTS_DIR = online-accounts
+endif
+
+SUBDIRS = \
+	$(ONLINE_ACCOUNTS_DIR) \
+	$(NULL)
+
+-include $(top_srcdir)/git.mk
diff --git a/modules/online-accounts/Makefile.am b/modules/online-accounts/Makefile.am
new file mode 100644
index 0000000..43d707d
--- /dev/null
+++ b/modules/online-accounts/Makefile.am
@@ -0,0 +1,28 @@
+NULL =
+
+module_LTLIBRARIES = module-online-accounts.la
+
+module_online_accounts_la_CPPFLAGS = \
+	$(AM_CPPFLAGS) \
+	-I$(top_srcdir) \
+	-DG_LOG_DOMAIN=\"module-online-accounts\" \
+	$(E_BACKEND_CFLAGS) \
+	$(GOA_CFLAGS) \
+	$(NULL)
+
+module_online_accounts_la_SOURCES = \
+	module-online-accounts.c \
+	$(NULL)
+
+module_online_accounts_la_LIBADD = \
+	$(top_builddir)/libebackend/libebackend-1.2.la \
+	$(top_builddir)/libedataserver/libedataserver-1.2.la \
+	$(E_BACKEND_LIBS) \
+	$(GOA_LIBS) \
+	$(NULL)
+
+module_online_accounts_la_LDFLAGS = \
+	-module -avoid-version $(NO_UNDEFINED) \
+	$(NULL)
+
+-include $(top_srcdir)/git.mk
diff --git a/modules/online-accounts/module-online-accounts.c b/modules/online-accounts/module-online-accounts.c
new file mode 100644
index 0000000..76570d2
--- /dev/null
+++ b/modules/online-accounts/module-online-accounts.c
@@ -0,0 +1,736 @@
+/*
+ * module-online-accounts.c
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) version 3.
+ *
+ * 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with the program; if not, see <http://www.gnu.org/licenses/>
+ *
+ */
+
+/* XXX Yeah, yeah... */
+#define GOA_API_IS_SUBJECT_TO_CHANGE
+
+#include <goa/goa.h>
+
+#include <libedataserver/e-uid.h>
+#include <libedataserver/e-source-authentication.h>
+#include <libedataserver/e-source-collection.h>
+#include <libedataserver/e-source-goa.h>
+#include <libedataserver/e-source-mail-account.h>
+#include <libedataserver/e-source-mail-identity.h>
+#include <libedataserver/e-source-mail-submission.h>
+#include <libedataserver/e-source-mail-transport.h>
+
+#include <libebackend/e-extension.h>
+#include <libebackend/e-server-side-source.h>
+#include <libebackend/e-source-registry-server.h>
+
+/* Standard GObject macros */
+#define E_TYPE_ONLINE_ACCOUNTS \
+	(e_online_accounts_get_type ())
+#define E_ONLINE_ACCOUNTS(obj) \
+	(G_TYPE_CHECK_INSTANCE_CAST \
+	((obj), E_TYPE_ONLINE_ACCOUNTS, EOnlineAccounts))
+
+#define CAMEL_OAUTH_MECHANISM_NAME  "XOAUTH"
+
+typedef struct _EOnlineAccounts EOnlineAccounts;
+typedef struct _EOnlineAccountsClass EOnlineAccountsClass;
+
+struct _EOnlineAccounts {
+	EExtension parent;
+
+	GoaClient *goa_client;
+	GCancellable *create_client;
+
+	/* GoaAccount ID -> ESource UID */
+	GHashTable *goa_to_eds;
+};
+
+struct _EOnlineAccountsClass {
+	EExtensionClass parent_class;
+};
+
+/* Module Entry Points */
+void e_module_load (GTypeModule *type_module);
+void e_module_unload (GTypeModule *type_module);
+
+/* Forward Declarations */
+GType e_online_accounts_get_type (void);
+
+G_DEFINE_DYNAMIC_TYPE (
+	EOnlineAccounts,
+	e_online_accounts,
+	E_TYPE_EXTENSION)
+
+static const gchar *
+online_accounts_get_backend_name (const gchar *goa_provider_type)
+{
+	const gchar *eds_backend_name = NULL;
+
+	/* This is a mapping between GoaAccount provider types and
+	 * ESourceCollection backend names.  It requires knowledge
+	 * of other registry modules, possibly even from 3rd party
+	 * packages.  No way around it. */
+
+	if (g_strcmp0 (goa_provider_type, "google") == 0)
+		eds_backend_name = "google";
+
+	else if (g_strcmp0 (goa_provider_type, "yahoo") == 0)
+		eds_backend_name = "yahoo";
+
+	return eds_backend_name;
+}
+
+static ESourceRegistryServer *
+online_accounts_get_server (EOnlineAccounts *extension)
+{
+	EExtensible *extensible;
+
+	extensible = e_extension_get_extensible (E_EXTENSION (extension));
+
+	return E_SOURCE_REGISTRY_SERVER (extensible);
+}
+
+static gboolean
+online_accounts_provider_type_to_backend_name (GBinding *binding,
+                                               const GValue *source_value,
+                                               GValue *target_value,
+                                               gpointer unused)
+{
+	const gchar *provider_type;
+	const gchar *backend_name;
+
+	provider_type = g_value_get_string (source_value);
+	backend_name = online_accounts_get_backend_name (provider_type);
+	g_return_val_if_fail (backend_name != NULL, FALSE);
+	g_value_set_string (target_value, backend_name);
+
+	return TRUE;
+}
+
+static gboolean
+online_accounts_object_is_non_null (GBinding *binding,
+                                    const GValue *source_value,
+                                    GValue *target_value,
+                                    gpointer unused)
+{
+	gpointer v_object;
+
+	v_object = g_value_get_object (source_value);
+	g_value_set_boolean (target_value, v_object != NULL);
+
+	return TRUE;
+}
+
+static gboolean
+online_accounts_supports_mail (GoaObject *goa_object)
+{
+	GoaMail *goa_mail;
+	gboolean supports_mail = FALSE;
+
+	/* This just sanity checks the GoaObject. */
+
+	goa_mail = goa_object_get_mail (goa_object);
+
+	if (goa_mail != NULL) {
+		supports_mail =
+			goa_mail_get_imap_supported (goa_mail) &&
+			goa_mail_get_smtp_supported (goa_mail);
+		g_object_unref (goa_mail);
+	}
+
+	return supports_mail;
+}
+
+static ESource *
+online_accounts_new_source (EOnlineAccounts *extension)
+{
+	ESourceRegistryServer *server;
+	ESource *source;
+	GFile *file;
+	GError *error = NULL;
+
+	/* This being a brand new data source, creating the instance
+	 * should never fail but we'll check for errors just the same. */
+	server = online_accounts_get_server (extension);
+	file = e_server_side_source_new_user_file (NULL);
+	source = e_server_side_source_new (server, file, &error);
+	g_object_unref (file);
+
+	if (error != NULL) {
+		g_warn_if_fail (source == NULL);
+		g_warning ("%s: %s", G_STRFUNC, error->message);
+		g_error_free (error);
+	}
+
+	return source;
+}
+
+static void
+online_accounts_config_collection (EOnlineAccounts *extension,
+                                   ESource *source,
+                                   GoaObject *goa_object)
+{
+	GoaAccount *goa_account;
+	ESourceExtension *source_extension;
+	const gchar *extension_name;
+
+	goa_account = goa_object_get_account (goa_object);
+
+	g_object_bind_property (
+		goa_account, "presentation-identity",
+		source, "display-name",
+		G_BINDING_SYNC_CREATE);
+
+	extension_name = E_SOURCE_EXTENSION_GOA;
+	source_extension = e_source_get_extension (source, extension_name);
+
+	g_object_bind_property (
+		goa_account, "id",
+		source_extension, "account-id",
+		G_BINDING_SYNC_CREATE);
+
+	extension_name = E_SOURCE_EXTENSION_COLLECTION;
+	source_extension = e_source_get_extension (source, extension_name);
+
+	g_object_bind_property_full (
+		goa_account, "provider-type",
+		source_extension, "backend-name",
+		G_BINDING_SYNC_CREATE,
+		online_accounts_provider_type_to_backend_name,
+		NULL,
+		NULL, (GDestroyNotify) NULL);
+
+	g_object_bind_property (
+		goa_account, "identity",
+		source_extension, "identity",
+		G_BINDING_SYNC_CREATE);
+
+	g_object_bind_property_full (
+		goa_object, "calendar",
+		source_extension, "calendar-enabled",
+		G_BINDING_SYNC_CREATE,
+		online_accounts_object_is_non_null,
+		NULL,
+		NULL, (GDestroyNotify) NULL);
+
+	g_object_bind_property_full (
+		goa_object, "contacts",
+		source_extension, "contacts-enabled",
+		G_BINDING_SYNC_CREATE,
+		online_accounts_object_is_non_null,
+		NULL,
+		NULL, (GDestroyNotify) NULL);
+
+	g_object_bind_property_full (
+		goa_object, "mail",
+		source_extension, "mail-enabled",
+		G_BINDING_SYNC_CREATE,
+		online_accounts_object_is_non_null,
+		NULL,
+		NULL, (GDestroyNotify) NULL);
+
+	g_object_unref (goa_account);
+
+	/* The data source should not be removable by clients. */
+	e_server_side_source_set_removable (
+		E_SERVER_SIDE_SOURCE (source), FALSE);
+}
+
+static void
+online_accounts_config_mail_account (EOnlineAccounts *extension,
+                                     ESource *source,
+                                     GoaObject *goa_object)
+{
+	ESourceExtension *source_extension;
+	const gchar *extension_name;
+
+	extension_name = E_SOURCE_EXTENSION_AUTHENTICATION;
+	source_extension = e_source_get_extension (source, extension_name);
+
+	if (goa_object_peek_oauth_based (goa_object) != NULL)
+		e_source_authentication_set_method (
+			E_SOURCE_AUTHENTICATION (source_extension),
+			CAMEL_OAUTH_MECHANISM_NAME);
+
+	/* XXX Need to defer the network security settings to the
+	 *     provider-specific module since "imap-use-tls" tells
+	 *     us neither the port number, nor whether to use IMAP
+	 *     over SSL versus STARTTLS.  The module will know. */
+}
+
+static void
+online_accounts_config_mail_identity (EOnlineAccounts *extension,
+                                      ESource *source,
+                                      GoaObject *goa_object)
+{
+	GoaMail *goa_mail;
+	ESourceExtension *source_extension;
+	const gchar *extension_name;
+
+	goa_mail = goa_object_get_mail (goa_object);
+	g_return_if_fail (goa_mail != NULL);
+
+	extension_name = E_SOURCE_EXTENSION_MAIL_IDENTITY;
+	source_extension = e_source_get_extension (source, extension_name);
+
+	g_object_bind_property (
+		goa_mail, "email-address",
+		source_extension, "address",
+		G_BINDING_SYNC_CREATE);
+
+	g_object_unref (goa_mail);
+}
+
+static void
+online_accounts_config_mail_transport (EOnlineAccounts *extension,
+                                       ESource *source,
+                                       GoaObject *goa_object)
+{
+	ESourceExtension *source_extension;
+	const gchar *extension_name;
+
+	extension_name = E_SOURCE_EXTENSION_AUTHENTICATION;
+	source_extension = e_source_get_extension (source, extension_name);
+
+	if (goa_object_peek_oauth_based (goa_object) != NULL)
+		e_source_authentication_set_method (
+			E_SOURCE_AUTHENTICATION (source_extension),
+			CAMEL_OAUTH_MECHANISM_NAME);
+
+	/* XXX Need to defer the network security settings to the
+	 *     provider-specific module since "smtp-use-tls" tells
+	 *     us neither the port number, nor whether to use SMTP
+	 *     over SSL versus STARTTLS.  The module will know. */
+}
+
+static void
+online_accounts_create_collection (EOnlineAccounts *extension,
+                                   EBackendFactory *backend_factory,
+                                   GoaObject *goa_object)
+{
+	GoaAccount *goa_account;
+	ESourceRegistryServer *server;
+	ESource *collection_source;
+	ESource *mail_account_source;
+	ESource *mail_identity_source;
+	ESource *mail_transport_source;
+	const gchar *account_id;
+	const gchar *parent_uid;
+
+	g_return_if_fail (online_accounts_supports_mail (goa_object));
+
+	server = online_accounts_get_server (extension);
+
+	collection_source = online_accounts_new_source (extension);
+	g_return_if_fail (E_IS_SOURCE (collection_source));
+
+	mail_account_source = online_accounts_new_source (extension);
+	g_return_if_fail (E_IS_SOURCE (mail_account_source));
+
+	mail_identity_source = online_accounts_new_source (extension);
+	g_return_if_fail (E_IS_SOURCE (mail_identity_source));
+
+	mail_transport_source = online_accounts_new_source (extension);
+	g_return_if_fail (E_IS_SOURCE (mail_transport_source));
+
+	/* Configure parent/child relationships. */
+	parent_uid = e_source_get_uid (collection_source);
+	e_source_set_parent (mail_account_source, parent_uid);
+	e_source_set_parent (mail_identity_source, parent_uid);
+	e_source_set_parent (mail_transport_source, parent_uid);
+
+	/* Give the factory first crack at mail configuration. */
+	e_collection_backend_factory_prepare_mail (
+		E_COLLECTION_BACKEND_FACTORY (backend_factory),
+		mail_account_source,
+		mail_identity_source,
+		mail_transport_source);
+
+	/* Now it's our turn. */
+	online_accounts_config_collection (
+		extension, collection_source, goa_object);
+	online_accounts_config_mail_account (
+		extension, mail_account_source, goa_object);
+	online_accounts_config_mail_identity (
+		extension, mail_identity_source, goa_object);
+	online_accounts_config_mail_transport (
+		extension, mail_transport_source, goa_object);
+
+	/* Export the new source collection. */
+	e_source_registry_server_add_source (server, collection_source);
+	e_source_registry_server_add_source (server, mail_account_source);
+	e_source_registry_server_add_source (server, mail_identity_source);
+	e_source_registry_server_add_source (server, mail_transport_source);
+
+	goa_account = goa_object_get_account (goa_object);
+	account_id = goa_account_get_id (goa_account);
+
+	g_hash_table_insert (
+		extension->goa_to_eds,
+		g_strdup (account_id),
+		g_strdup (parent_uid));
+
+	g_object_unref (goa_account);
+
+	g_object_unref (collection_source);
+	g_object_unref (mail_account_source);
+	g_object_unref (mail_identity_source);
+	g_object_unref (mail_transport_source);
+}
+
+static void
+online_accounts_remove_collection (EOnlineAccounts *extension,
+                                   ESource *source)
+{
+	GError *error = NULL;
+
+	/* This removes the entire subtree rooted at source.
+	 * Deletes the corresponding on-disk key files too. */
+	e_source_remove_sync (source, NULL, &error);
+
+	if (error != NULL) {
+		g_warning ("%s: %s", G_STRFUNC, error->message);
+		g_error_free (error);
+	}
+}
+
+static void
+online_accounts_account_added_cb (GoaClient *goa_client,
+                                  GoaObject *goa_object,
+                                  EOnlineAccounts *extension)
+{
+	GoaAccount *goa_account;
+	ESourceRegistryServer *server;
+	EBackendFactory *backend_factory = NULL;
+	const gchar *provider_type;
+	const gchar *backend_name;
+	const gchar *account_id;
+	const gchar *source_uid;
+
+	server = online_accounts_get_server (extension);
+
+	goa_account = goa_object_get_account (goa_object);
+	provider_type = goa_account_get_provider_type (goa_account);
+	backend_name = online_accounts_get_backend_name (provider_type);
+
+	account_id = goa_account_get_id (goa_account);
+	source_uid = g_hash_table_lookup (extension->goa_to_eds, account_id);
+
+	if (source_uid == NULL && backend_name != NULL)
+		backend_factory = e_data_factory_ref_backend_factory (
+			E_DATA_FACTORY (server), backend_name);
+
+	if (backend_factory != NULL) {
+		online_accounts_create_collection (
+			extension, backend_factory, goa_object);
+		g_object_unref (backend_factory);
+	}
+
+	g_object_unref (goa_account);
+}
+
+static void
+online_accounts_account_removed_cb (GoaClient *goa_client,
+                                    GoaObject *goa_object,
+                                    EOnlineAccounts *extension)
+{
+	ESource *source = NULL;
+	ESourceRegistryServer *server;
+	GoaAccount *goa_account;
+	const gchar *account_id;
+	const gchar *source_uid;
+
+	server = online_accounts_get_server (extension);
+
+	goa_account = goa_object_get_account (goa_object);
+
+	account_id = goa_account_get_id (goa_account);
+	source_uid = g_hash_table_lookup (extension->goa_to_eds, account_id);
+
+	if (source_uid != NULL)
+		source = e_source_registry_server_ref_source (
+			server, source_uid);
+
+	if (source != NULL) {
+		online_accounts_remove_collection (extension, source);
+		g_object_unref (source);
+	}
+
+	g_object_unref (goa_account);
+}
+
+static gint
+online_accounts_compare_id (GoaObject *goa_object,
+                            const gchar *target_id)
+{
+	GoaAccount *goa_account;
+	const gchar *account_id;
+	gint result;
+
+	goa_account = goa_object_get_account (goa_object);
+	account_id = goa_account_get_id (goa_account);
+	result = g_strcmp0 (account_id, target_id);
+	g_object_unref (goa_account);
+
+	return result;
+}
+
+static void
+online_accounts_populate_accounts_table (EOnlineAccounts *extension,
+                                         GList *goa_objects)
+{
+	ESourceRegistryServer *server;
+	GQueue trash = G_QUEUE_INIT;
+	GList *list, *link;
+	const gchar *extension_name;
+
+	server = online_accounts_get_server (extension);
+
+	extension_name = E_SOURCE_EXTENSION_GOA;
+	list = e_source_registry_server_list_sources (server, extension_name);
+
+	for (link = list; link != NULL; link = g_list_next (link)) {
+		ESource *source;
+		ESourceGoa *goa_ext;
+		const gchar *account_id;
+		const gchar *source_uid;
+		GList *match;
+
+		source = E_SOURCE (link->data);
+		source_uid = e_source_get_uid (source);
+
+		extension_name = E_SOURCE_EXTENSION_GOA;
+		goa_ext = e_source_get_extension (source, extension_name);
+		account_id = e_source_goa_get_account_id (goa_ext);
+
+		if (account_id == NULL)
+			continue;
+
+		/* Verify the GOA account still exists. */
+		match = g_list_find_custom (
+			goa_objects, account_id,
+			(GCompareFunc) online_accounts_compare_id);
+
+		/* If a matching GoaObject was found, add its ID
+		 * to our accounts hash table.  Otherwise remove
+		 * the ESource after we finish looping. */
+		if (match != NULL) {
+			GoaObject *goa_object;
+
+			g_hash_table_insert (
+				extension->goa_to_eds,
+				g_strdup (account_id),
+				g_strdup (source_uid));
+
+			goa_object = GOA_OBJECT (match->data);
+			online_accounts_config_collection (
+				extension, source, goa_object);
+		} else {
+			g_queue_push_tail (&trash, source);
+		}
+	}
+
+	/* Empty the trash. */
+	while (!g_queue_is_empty (&trash)) {
+		ESource *source = g_queue_pop_head (&trash);
+		online_accounts_remove_collection (extension, source);
+	}
+
+	g_list_free_full (list, (GDestroyNotify) g_object_unref);
+}
+
+static void
+online_accounts_create_client_cb (GObject *source_object,
+                                  GAsyncResult *result,
+                                  gpointer user_data)
+{
+	EOnlineAccounts *extension;
+	GoaClient *goa_client;
+	GList *list, *link;
+	GError *error = NULL;
+
+	/* If we get back a G_IO_ERROR_CANCELLED then it means the
+	 * EOnlineAccounts is already finalized, so be careful not
+	 * to touch it until after we have a valid GoaClient. */
+
+	goa_client = goa_client_new_finish (result, &error);
+
+	if (error != NULL) {
+		g_warn_if_fail (goa_client == NULL);
+		g_warning (
+			"Unable to connect to the GNOME Online "
+			"Accounts service: %s", error->message);
+		g_error_free (error);
+		return;
+	}
+
+	g_return_if_fail (GOA_IS_CLIENT (goa_client));
+
+	/* Should be safe to dereference the EOnlineAccounts now. */
+
+	extension = E_ONLINE_ACCOUNTS (user_data);
+	extension->goa_client = goa_client;  /* takes ownership */
+
+	/* Don't need the GCancellable anymore. */
+	g_object_unref (extension->create_client);
+	extension->create_client = NULL;
+
+	list = goa_client_get_accounts (extension->goa_client);
+
+	/* This populates a hash table of GOA ID -> ESource UID strings by
+	 * searching through available data sources for ones with a "GNOME
+	 * Online Accounts" extension.  If such an extension is found, but
+	 * no corresponding GoaAccount (presumably meaning the GOA account
+	 * was somehow deleted between E-D-S sessions) then the ESource in
+	 * which the extension was found gets deleted. */
+	online_accounts_populate_accounts_table (extension, list);
+
+	for (link = list; link != NULL; link = g_list_next (link))
+		online_accounts_account_added_cb (
+			extension->goa_client,
+			GOA_OBJECT (link->data),
+			extension);
+
+	g_list_free_full (list, (GDestroyNotify) g_object_unref);
+
+	/* Listen for Online Account changes. */
+	g_signal_connect (
+		extension->goa_client, "account-added",
+		G_CALLBACK (online_accounts_account_added_cb), extension);
+	g_signal_connect (
+		extension->goa_client, "account-removed",
+		G_CALLBACK (online_accounts_account_removed_cb), extension);
+}
+
+static void
+online_accounts_bus_acquired_cb (EDBusServer *server,
+                                 GDBusConnection *connection,
+                                 EOnlineAccounts *extension)
+{
+	/* Connect to the GNOME Online Accounts service. */
+
+	/* Note we don't reference the extension.  If the
+	 * extension gets destroyed before this completes
+	 * we cancel the operation from dispose(). */
+	goa_client_new (
+		extension->create_client,
+		online_accounts_create_client_cb,
+		extension);
+}
+
+static void
+online_accounts_dispose (GObject *object)
+{
+	EOnlineAccounts *extension;
+
+	extension = E_ONLINE_ACCOUNTS (object);
+
+	if (extension->goa_client != NULL) {
+		g_signal_handlers_disconnect_matched (
+			extension->goa_client,
+			G_SIGNAL_MATCH_DATA,
+			0, 0, NULL, NULL, object);
+		g_object_unref (extension->goa_client);
+		extension->goa_client = NULL;
+	}
+
+	/* This cancels goa_client_new() in case it still
+	 * hasn't completed.  We're no longer interested. */
+	if (extension->create_client != NULL) {
+		g_cancellable_cancel (extension->create_client);
+		g_object_unref (extension->create_client);
+		extension->create_client = NULL;
+	}
+
+	/* Chain up to parent's dispose() method. */
+	G_OBJECT_CLASS (e_online_accounts_parent_class)->dispose (object);
+}
+
+static void
+online_accounts_finalize (GObject *object)
+{
+	EOnlineAccounts *extension;
+
+	extension = E_ONLINE_ACCOUNTS (object);
+
+	g_hash_table_destroy (extension->goa_to_eds);
+
+	/* Chain up to parent's finalize() method. */
+	G_OBJECT_CLASS (e_online_accounts_parent_class)->finalize (object);
+}
+
+static void
+online_accounts_constructed (GObject *object)
+{
+	EExtension *extension;
+	EExtensible *extensible;
+
+	extension = E_EXTENSION (object);
+	extensible = e_extension_get_extensible (extension);
+
+	/* Wait for the registry service to acquire its well-known
+	 * bus name so we don't do anything destructive beforehand. */
+
+	g_signal_connect (
+		extensible, "bus-acquired",
+		G_CALLBACK (online_accounts_bus_acquired_cb), extension);
+
+	/* Chain up to parent's constructed() method. */
+	G_OBJECT_CLASS (e_online_accounts_parent_class)->constructed (object);
+}
+
+static void
+e_online_accounts_class_init (EOnlineAccountsClass *class)
+{
+	GObjectClass *object_class;
+	EExtensionClass *extension_class;
+
+	object_class = G_OBJECT_CLASS (class);
+	object_class->dispose = online_accounts_dispose;
+	object_class->finalize = online_accounts_finalize;
+	object_class->constructed = online_accounts_constructed;
+
+	extension_class = E_EXTENSION_CLASS (class);
+	extension_class->extensible_type = E_TYPE_SOURCE_REGISTRY_SERVER;
+}
+
+static void
+e_online_accounts_class_finalize (EOnlineAccountsClass *class)
+{
+}
+
+static void
+e_online_accounts_init (EOnlineAccounts *extension)
+{
+	/* Used to cancel unfinished goa_client_new(). */
+	extension->create_client = g_cancellable_new ();
+
+	extension->goa_to_eds = g_hash_table_new_full (
+		(GHashFunc) g_str_hash,
+		(GEqualFunc) g_str_equal,
+		(GDestroyNotify) g_free,
+		(GDestroyNotify) g_free);
+}
+
+G_MODULE_EXPORT void
+e_module_load (GTypeModule *type_module)
+{
+	e_online_accounts_register_type (type_module);
+}
+
+G_MODULE_EXPORT void
+e_module_unload (GTypeModule *type_module)
+{
+}
+
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