Move SASL mechanism implementations into its own file

We could have other account providers than GOA requiring
this SASL code.

https://bugzilla.gnome.org/show_bug.cgi?id=680160

8 files changed, 393 insertions, 151 deletions

diff --git a/libempathy/Makefile.am b/libempathy/Makefile.am
index cfa525508..67e64a9f6 100644
--- a/libempathy/Makefile.am
+++ b/libempathy/Makefile.am
@@ -49,6 +49,7 @@ libempathy_headers =				\
 	empathy-message.h			\
 	empathy-pkg-kit.h		\
 	empathy-request-util.h			\
+	empathy-sasl-mechanisms.h		\
 	empathy-server-sasl-handler.h		\
 	empathy-server-tls-handler.h		\
 	empathy-status-presets.h		\
@@ -83,6 +84,7 @@ libempathy_handwritten_source =				\
 	empathy-message.c				\
 	empathy-pkg-kit.c		\
 	empathy-request-util.c				\
+	empathy-sasl-mechanisms.c			\
 	empathy-server-sasl-handler.c			\
 	empathy-server-tls-handler.c			\
 	empathy-status-presets.c			\
diff --git a/libempathy/empathy-auth-factory.c b/libempathy/empathy-auth-factory.c
index fb178216d..922528577 100644
--- a/libempathy/empathy-auth-factory.c
+++ b/libempathy/empathy-auth-factory.c
@@ -27,6 +27,7 @@
 #define DEBUG_FLAG EMPATHY_DEBUG_TLS
 #include "empathy-debug.h"
 #include "empathy-keyring.h"
+#include "empathy-sasl-mechanisms.h"
 #include "empathy-server-sasl-handler.h"
 #include "empathy-server-tls-handler.h"
 #include "empathy-utils.h"
diff --git a/libempathy/empathy-goa-auth-handler.c b/libempathy/empathy-goa-auth-handler.c
index a439c72c2..260ba1264 100644
--- a/libempathy/empathy-goa-auth-handler.c
+++ b/libempathy/empathy-goa-auth-handler.c
@@ -1,5 +1,5 @@
 /*
- * empathy-auth-goa.c - Source for Goa SASL authentication
+ * empathy-goa-auth-handler.c - Source for Goa SASL authentication
  * Copyright (C) 2011 Collabora Ltd.
  * @author Xavier Claessens <xavier.claessens@collabora.co.uk>
  *
@@ -23,21 +23,11 @@
 #define GOA_API_IS_SUBJECT_TO_CHANGE /* awesome! */
 #include <goa/goa.h>
 
-#include <libsoup/soup.h>
-#include <string.h>
-
 #define DEBUG_FLAG EMPATHY_DEBUG_SASL
 #include "empathy-debug.h"
 #include "empathy-utils.h"
 #include "empathy-goa-auth-handler.h"
-
-#define MECH_FACEBOOK "X-FACEBOOK-PLATFORM"
-#define MECH_MSN "X-MESSENGER-OAUTH2"
-
-static const gchar *supported_mechanisms[] = {
-    MECH_FACEBOOK,
-    MECH_MSN,
-    NULL};
+#include "empathy-sasl-mechanisms.h"
 
 struct _EmpathyGoaAuthHandlerPriv
 {
@@ -118,77 +108,25 @@ fail_auth (AuthData *data)
 }
 
 static void
-sasl_status_changed_cb (TpChannel *channel,
-    guint status,
-    const gchar *reason,
-    GHashTable *details,
-    gpointer user_data,
-    GObject *self)
-{
-  switch (status)
-    {
-      case TP_SASL_STATUS_SERVER_SUCCEEDED:
-        tp_cli_channel_interface_sasl_authentication_call_accept_sasl (channel,
-            -1, NULL, NULL, NULL, NULL);
-        break;
-
-      case TP_SASL_STATUS_SUCCEEDED:
-      case TP_SASL_STATUS_SERVER_FAILED:
-      case TP_SASL_STATUS_CLIENT_FAILED:
-        tp_cli_channel_call_close (channel, -1, NULL, NULL, NULL, NULL);
-        break;
-
-      default:
-        break;
-    }
-}
-
-static void
-facebook_new_challenge_cb (TpChannel *channel,
-    const GArray *challenge,
-    gpointer user_data,
-    GObject *weak_object)
+auth_cb (GObject *source,
+    GAsyncResult *result,
+    gpointer user_data)
 {
+  TpChannel *channel = (TpChannel *) source;
   AuthData *data = user_data;
-  GoaOAuth2Based *oauth2;
-  const gchar *client_id;
-  GHashTable *h;
-  GHashTable *params;
-  gchar *response;
-  GArray *response_array;
-
-  DEBUG ("new challenge for %s:\n%s",
-      tp_proxy_get_object_path (data->account),
-      challenge->data);
-
-  h = soup_form_decode (challenge->data);
-
-  oauth2 = goa_object_get_oauth2_based (data->goa_object);
-  client_id = goa_oauth2_based_get_client_id (oauth2);
-
-  /* See https://developers.facebook.com/docs/chat/#platauth */
-  params = g_hash_table_new (g_str_hash, g_str_equal);
-  g_hash_table_insert (params, "method", g_hash_table_lookup (h, "method"));
-  g_hash_table_insert (params, "nonce", g_hash_table_lookup (h, "nonce"));
-  g_hash_table_insert (params, "access_token", data->access_token);
-  g_hash_table_insert (params, "api_key", (gpointer) client_id);
-  g_hash_table_insert (params, "call_id", "0");
-  g_hash_table_insert (params, "v", "1.0");
-
-  response = soup_form_encode_hash (params);
-  DEBUG ("Response: %s", response);
-
-  response_array = g_array_new (FALSE, FALSE, sizeof (gchar));
-  g_array_append_vals (response_array, response, strlen (response));
+  GError *error = NULL;
 
-  tp_cli_channel_interface_sasl_authentication_call_respond (data->channel, -1,
-      response_array, NULL, NULL, NULL, NULL);
+  if (!empathy_sasl_auth_finish (channel, result, &error))
+    {
+      DEBUG ("SASL Mechanism error: %s", error->message);
+      fail_auth (data);
+      g_clear_error (&error);
+      return;
+    }
 
-  g_hash_table_unref (h);
-  g_hash_table_unref (params);
-  g_object_unref (oauth2);
-  g_free (response);
-  g_array_unref (response_array);
+  /* Success! */
+  tp_channel_close_async (channel, NULL, NULL);
+  auth_data_free (data);
 }
 
 static void
@@ -198,11 +136,12 @@ got_oauth2_access_token_cb (GObject *source,
 {
   GoaOAuth2Based *oauth2 = (GoaOAuth2Based *) source;
   AuthData *data = user_data;
+  gchar *access_token;
   gint expires_in;
   GError *error = NULL;
 
   if (!goa_oauth2_based_call_get_access_token_finish (oauth2,
-      &data->access_token, &expires_in, result, &error))
+          &access_token, &expires_in, result, &error))
     {
       DEBUG ("Failed to get access token: %s", error->message);
       fail_auth (data);
@@ -212,55 +151,27 @@ got_oauth2_access_token_cb (GObject *source,
 
   DEBUG ("Got access token for %s:\n%s",
       tp_proxy_get_object_path (data->account),
-      data->access_token);
-
-  tp_cli_channel_interface_sasl_authentication_connect_to_sasl_status_changed (
-      data->channel, sasl_status_changed_cb, NULL, NULL, NULL, NULL);
-  g_assert_no_error (error);
+      access_token);
 
-  if (empathy_sasl_channel_supports_mechanism (data->channel, MECH_FACEBOOK))
+  switch (empathy_sasl_channel_select_mechanism (data->channel))
     {
-      /* Give ownership of data to signal connection */
-      tp_cli_channel_interface_sasl_authentication_connect_to_new_challenge (
-          data->channel, facebook_new_challenge_cb,
-          data, (GDestroyNotify) auth_data_free,
-          NULL, NULL);
+      case EMPATHY_SASL_MECHANISM_FACEBOOK:
+        empathy_sasl_auth_facebook_async (data->channel,
+            goa_oauth2_based_get_client_id (oauth2), access_token,
+            auth_cb, NULL);
+        break;
 
-      DEBUG ("Start %s mechanism for account %s", MECH_FACEBOOK,
-          tp_proxy_get_object_path (data->account));
+      case EMPATHY_SASL_MECHANISM_WLM:
+        empathy_sasl_auth_wlm_async (data->channel,
+            access_token,
+            auth_cb, NULL);
+        break;
 
-      tp_cli_channel_interface_sasl_authentication_call_start_mechanism (
-          data->channel, -1, MECH_FACEBOOK, NULL, NULL, NULL, NULL);
-    }
-  else if (empathy_sasl_channel_supports_mechanism (data->channel, MECH_MSN))
-    {
-      guchar *token_decoded;
-      gsize token_decoded_len;
-      GArray *token_decoded_array;
-
-      /* Wocky will base64 encode, but token actually already is base64, so we
-       * decode now and it will be re-encoded. */
-      token_decoded = g_base64_decode (data->access_token, &token_decoded_len);
-      token_decoded_array = g_array_new (FALSE, FALSE, sizeof (guchar));
-      g_array_append_vals (token_decoded_array, token_decoded, token_decoded_len);
-
-      DEBUG ("Start %s mechanism for account %s", MECH_MSN,
-          tp_proxy_get_object_path (data->account));
-
-      tp_cli_channel_interface_sasl_authentication_call_start_mechanism_with_data (
-          data->channel, -1, MECH_MSN, token_decoded_array,
-          NULL, NULL, NULL, NULL);
-
-      g_array_unref (token_decoded_array);
-      g_free (token_decoded);
-      auth_data_free (data);
-    }
-  else
-    {
-      /* We already checked it supports one of supported_mechanisms, so this
-       * can't happen */
-      g_assert_not_reached ();
+      default:
+        g_assert_not_reached ();
     }
+
+  g_free (access_token);
 }
 
 static void
@@ -417,7 +328,7 @@ empathy_goa_auth_handler_supports (EmpathyGoaAuthHandler *self,
     TpAccount *account)
 {
   const gchar *provider;
-  const gchar * const *iter;
+  EmpathySaslMechanism mech;
 
   g_return_val_if_fail (TP_IS_CHANNEL (channel), FALSE);
   g_return_val_if_fail (TP_IS_ACCOUNT (account), FALSE);
@@ -426,11 +337,7 @@ empathy_goa_auth_handler_supports (EmpathyGoaAuthHandler *self,
   if (tp_strdiff (provider, EMPATHY_GOA_PROVIDER))
     return FALSE;
 
-  for (iter = supported_mechanisms; *iter != NULL; iter++)
-    {
-      if (empathy_sasl_channel_supports_mechanism (channel, *iter))
-        return TRUE;
-    }
-
-  return FALSE;
+  mech = empathy_sasl_channel_select_mechanism (channel);
+  return mech == EMPATHY_SASL_MECHANISM_FACEBOOK ||
+      mech == EMPATHY_SASL_MECHANISM_WLM;
 }
diff --git a/libempathy/empathy-goa-auth-handler.h b/libempathy/empathy-goa-auth-handler.h
index 5b7c08774..9e7d110ca 100644
--- a/libempathy/empathy-goa-auth-handler.h
+++ b/libempathy/empathy-goa-auth-handler.h
@@ -1,5 +1,5 @@
 /*
- * empathy-auth-goa.h - Header for Goa SASL authentication
+ * empathy-goa-auth-handler.h - Header for Goa SASL authentication
  * Copyright (C) 2011 Collabora Ltd.
  * @author Xavier Claessens <xavier.claessens@collabora.co.uk>
  *
diff --git a/libempathy/empathy-sasl-mechanisms.c b/libempathy/empathy-sasl-mechanisms.c
new file mode 100644
index 000000000..5bdc7590f
--- /dev/null
+++ b/libempathy/empathy-sasl-mechanisms.c
@@ -0,0 +1,293 @@
+/*
+ * empathy-sasl-mechanisms.h - Header for SASL authentication mechanisms
+ * Copyright (C) 2012 Collabora Ltd.
+ * @author Xavier Claessens <xavier.claessens@collabora.co.uk>
+ *
+ * This library 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 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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 this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include "config.h"
+
+#include <libsoup/soup.h>
+#include <string.h>
+
+#define DEBUG_FLAG EMPATHY_DEBUG_SASL
+#include "empathy-debug.h"
+#include "empathy-utils.h"
+#include "empathy-sasl-mechanisms.h"
+
+#define MECH_FACEBOOK "X-FACEBOOK-PLATFORM"
+#define MECH_WLM "X-MESSENGER-OAUTH2"
+
+typedef struct
+{
+  EmpathySaslMechanism id;
+  const gchar *name;
+} SupportedMech;
+
+static SupportedMech supported_mechanisms[] = {
+  { EMPATHY_SASL_MECHANISM_FACEBOOK, MECH_FACEBOOK },
+  { EMPATHY_SASL_MECHANISM_WLM, MECH_WLM },
+};
+
+static void
+generic_cb (TpChannel *proxy,
+    const GError *error,
+    gpointer user_data,
+    GObject *weak_object)
+{
+  GSimpleAsyncResult *result = user_data;
+
+  if (error != NULL)
+    {
+      g_simple_async_result_set_from_error (result, error);
+      g_simple_async_result_complete (result);
+    }
+}
+
+static void
+sasl_status_changed_cb (TpChannel *channel,
+    guint status,
+    const gchar *dbus_error,
+    GHashTable *details,
+    gpointer user_data,
+    GObject *self)
+{
+  GSimpleAsyncResult *result = user_data;
+
+  switch (status)
+    {
+      case TP_SASL_STATUS_SERVER_SUCCEEDED:
+        tp_cli_channel_interface_sasl_authentication_call_accept_sasl (channel,
+            -1, generic_cb, g_object_ref (result), g_object_unref, NULL);
+        break;
+
+      case TP_SASL_STATUS_SERVER_FAILED:
+      case TP_SASL_STATUS_CLIENT_FAILED:
+        {
+          GError *error = NULL;
+
+          tp_proxy_dbus_error_to_gerror (channel, dbus_error,
+              tp_asv_get_string (details, "debug-message"), &error);
+
+          g_simple_async_result_take_error (result, error);
+        }
+        break;
+
+      case TP_SASL_STATUS_SUCCEEDED:
+        g_simple_async_result_complete (result);
+        break;
+
+      default:
+        break;
+    }
+}
+
+static GSimpleAsyncResult *
+empathy_sasl_auth_common_async (TpChannel *channel,
+    GAsyncReadyCallback callback,
+    gpointer user_data)
+{
+  GSimpleAsyncResult *result;
+  GError *error = NULL;
+
+  g_return_val_if_fail (TP_IS_CHANNEL (channel), NULL);
+  g_return_val_if_fail (tp_proxy_has_interface_by_id (channel,
+      TP_IFACE_QUARK_CHANNEL_INTERFACE_SASL_AUTHENTICATION), NULL);
+
+  result = g_simple_async_result_new ((GObject *) channel,
+      callback, user_data, empathy_sasl_auth_common_async);
+
+  tp_cli_channel_interface_sasl_authentication_connect_to_sasl_status_changed (
+      channel, sasl_status_changed_cb,
+      g_object_ref (result), g_object_unref, NULL, &error);
+  g_assert_no_error (error);
+
+  return result;
+}
+
+typedef struct
+{
+  TpChannel *channel;
+  gchar *client_id;
+  gchar *access_token;
+} FacebookData;
+
+static void
+facebook_data_free (FacebookData *data)
+{
+  g_object_unref (data->channel);
+  g_free (data->client_id);
+  g_free (data->access_token);
+  g_slice_free (FacebookData, data);
+}
+
+static void
+facebook_new_challenge_cb (TpChannel *channel,
+    const GArray *challenge,
+    gpointer user_data,
+    GObject *weak_object)
+{
+  GSimpleAsyncResult *result = user_data;
+  FacebookData *data;
+  GHashTable *h;
+  GHashTable *params;
+  gchar *response;
+  GArray *response_array;
+
+  DEBUG ("new challenge: %s", challenge->data);
+
+  data = g_simple_async_result_get_op_res_gpointer (result);
+
+  h = soup_form_decode (challenge->data);
+
+  /* See https://developers.facebook.com/docs/chat/#platauth */
+  params = g_hash_table_new (g_str_hash, g_str_equal);
+  g_hash_table_insert (params, "method", g_hash_table_lookup (h, "method"));
+  g_hash_table_insert (params, "nonce", g_hash_table_lookup (h, "nonce"));
+  g_hash_table_insert (params, "access_token", data->access_token);
+  g_hash_table_insert (params, "api_key", data->client_id);
+  g_hash_table_insert (params, "call_id", "0");
+  g_hash_table_insert (params, "v", "1.0");
+
+  response = soup_form_encode_hash (params);
+  DEBUG ("Response: %s", response);
+
+  response_array = g_array_new (FALSE, FALSE, sizeof (gchar));
+  g_array_append_vals (response_array, response, strlen (response));
+
+  tp_cli_channel_interface_sasl_authentication_call_respond (data->channel, -1,
+      response_array, generic_cb, g_object_ref (result), g_object_unref, NULL);
+
+  g_hash_table_unref (h);
+  g_hash_table_unref (params);
+  g_free (response);
+  g_array_unref (response_array);
+}
+
+void
+empathy_sasl_auth_facebook_async (TpChannel *channel,
+    const gchar *client_id,
+    const gchar *access_token,
+    GAsyncReadyCallback callback,
+    gpointer user_data)
+{
+  GSimpleAsyncResult *result;
+  FacebookData *data;
+  GError *error = NULL;
+
+  result = empathy_sasl_auth_common_async (channel, callback, user_data);
+
+  g_return_if_fail (result != NULL);
+  g_return_if_fail (empathy_sasl_channel_supports_mechanism (channel,
+      MECH_FACEBOOK));
+  g_return_if_fail (!tp_str_empty (client_id));
+  g_return_if_fail (!tp_str_empty (access_token));
+
+  DEBUG ("Start %s mechanism", MECH_FACEBOOK);
+
+  data = g_slice_new0 (FacebookData);
+  data->channel = g_object_ref (channel);
+  data->client_id = g_strdup (client_id);
+  data->access_token = g_strdup (access_token);
+
+  g_simple_async_result_set_op_res_gpointer (result, data,
+      (GDestroyNotify) facebook_data_free);
+
+  tp_cli_channel_interface_sasl_authentication_connect_to_new_challenge (
+      channel, facebook_new_challenge_cb,
+      g_object_ref (result), g_object_unref,
+      NULL, &error);
+  g_assert_no_error (error);
+
+  tp_cli_channel_interface_sasl_authentication_call_start_mechanism (
+      channel, -1, MECH_FACEBOOK, generic_cb,
+      g_object_ref (result), g_object_unref, NULL);
+
+  g_object_unref (result);
+}
+
+void
+empathy_sasl_auth_wlm_async (TpChannel *channel,
+    const gchar *access_token,
+    GAsyncReadyCallback callback,
+    gpointer user_data)
+{
+  GSimpleAsyncResult *result;
+  guchar *token_decoded;
+  gsize token_decoded_len;
+  GArray *token_decoded_array;
+
+  result = empathy_sasl_auth_common_async (channel, callback, user_data);
+
+  g_return_if_fail (result != NULL);
+  g_return_if_fail (empathy_sasl_channel_supports_mechanism (channel,
+      MECH_WLM));
+  g_return_if_fail (!tp_str_empty (access_token));
+
+  DEBUG ("Start %s mechanism", MECH_WLM);
+
+  /* Wocky will base64 encode, but token actually already is base64, so we
+   * decode now and it will be re-encoded. */
+  token_decoded = g_base64_decode (access_token, &token_decoded_len);
+  token_decoded_array = g_array_new (FALSE, FALSE, sizeof (guchar));
+  g_array_append_vals (token_decoded_array, token_decoded, token_decoded_len);
+
+  tp_cli_channel_interface_sasl_authentication_call_start_mechanism_with_data (
+      channel, -1, MECH_WLM, token_decoded_array,
+      generic_cb, g_object_ref (result), g_object_unref, NULL);
+
+  g_array_unref (token_decoded_array);
+  g_free (token_decoded);
+  g_object_unref (result);
+}
+
+gboolean
+empathy_sasl_auth_finish (TpChannel *channel,
+    GAsyncResult *result,
+    GError **error)
+{
+  empathy_implement_finish_void (channel, empathy_sasl_auth_common_async);
+}
+
+gboolean
+empathy_sasl_channel_supports_mechanism (TpChannel *channel,
+    const gchar *mechanism)
+{
+  GHashTable *props;
+  const gchar * const *available_mechanisms;
+
+  props = tp_channel_borrow_immutable_properties (channel);
+  available_mechanisms = tp_asv_get_boxed (props,
+      TP_PROP_CHANNEL_INTERFACE_SASL_AUTHENTICATION_AVAILABLE_MECHANISMS,
+      G_TYPE_STRV);
+
+  return tp_strv_contains (available_mechanisms, mechanism);
+}
+
+EmpathySaslMechanism
+empathy_sasl_channel_select_mechanism (TpChannel *channel)
+{
+  guint i;
+
+  for (i = 0; i < G_N_ELEMENTS (supported_mechanisms); i++)
+    {
+      if (empathy_sasl_channel_supports_mechanism (channel,
+              supported_mechanisms[i].name))
+        return supported_mechanisms[i].id;
+    }
+
+  return EMPATHY_SASL_MECHANISM_UNSUPPORTED;
+}
diff --git a/libempathy/empathy-sasl-mechanisms.h b/libempathy/empathy-sasl-mechanisms.h
new file mode 100644
index 000000000..84165ac70
--- /dev/null
+++ b/libempathy/empathy-sasl-mechanisms.h
@@ -0,0 +1,57 @@
+/*
+ * empathy-sasl-mechanisms.h - Header for SASL authentication mechanisms
+ * Copyright (C) 2012 Collabora Ltd.
+ * @author Xavier Claessens <xavier.claessens@collabora.co.uk>
+ *
+ * This library 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 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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 this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#ifndef __EMPATHY_SASL_MECHANISMS_H__
+#define __EMPATHY_SASL_MECHANISMS_H__
+
+#include <telepathy-glib/telepathy-glib.h>
+
+G_BEGIN_DECLS
+
+typedef enum
+{
+  EMPATHY_SASL_MECHANISM_UNSUPPORTED,
+  EMPATHY_SASL_MECHANISM_FACEBOOK,
+  EMPATHY_SASL_MECHANISM_WLM,
+} EmpathySaslMechanism;
+
+void empathy_sasl_auth_facebook_async (TpChannel *channel,
+    const gchar *client_id,
+    const gchar *access_token,
+    GAsyncReadyCallback callback,
+    gpointer user_data);
+
+void empathy_sasl_auth_wlm_async (TpChannel *channel,
+    const gchar *access_token,
+    GAsyncReadyCallback callback,
+    gpointer user_data);
+
+gboolean empathy_sasl_auth_finish (TpChannel *channel,
+    GAsyncResult *result,
+    GError **error);
+
+gboolean empathy_sasl_channel_supports_mechanism (TpChannel *channel,
+    const gchar *mechanism);
+
+EmpathySaslMechanism empathy_sasl_channel_select_mechanism (TpChannel *channel);
+
+G_END_DECLS
+
+#endif /* #ifndef __EMPATHY_SASL_MECHANISMS_H__*/
diff --git a/libempathy/empathy-utils.c b/libempathy/empathy-utils.c
index ccaf955e4..cc518c0b0 100644
--- a/libempathy/empathy-utils.c
+++ b/libempathy/empathy-utils.c
@@ -1121,21 +1121,6 @@ while_finish:
     *can_video_call = can_video;
 }
 
-gboolean
-empathy_sasl_channel_supports_mechanism (TpChannel *channel,
-    const gchar *mechanism)
-{
-  GHashTable *props;
-  const gchar * const *available_mechanisms;
-
-  props = tp_channel_borrow_immutable_properties (channel);
-  available_mechanisms = tp_asv_get_boxed (props,
-      TP_PROP_CHANNEL_INTERFACE_SASL_AUTHENTICATION_AVAILABLE_MECHANISMS,
-      G_TYPE_STRV);
-
-  return tp_strv_contains (available_mechanisms, mechanism);
-}
-
 static FolksIndividual *
 create_individual_from_persona (FolksPersona *persona)
 {
diff --git a/libempathy/empathy-utils.h b/libempathy/empathy-utils.h
index 088c39236..c3a5886a3 100644
--- a/libempathy/empathy-utils.h
+++ b/libempathy/empathy-utils.h
@@ -115,9 +115,6 @@ void empathy_individual_can_audio_video_call (FolksIndividual *individual,
     gboolean *can_video_call,
     EmpathyContact **out_contact);
 
-gboolean empathy_sasl_channel_supports_mechanism (TpChannel *channel,
-    const gchar *mechanism);
-
 FolksIndividual * empathy_create_individual_from_tp_contact (
     TpContact *contact);