[gnome-online-accounts/facebook] oauth2provider: Provide a default implementation for get_token_uri

[Debarshi Ray <debarshir src gnome org>]

commit be3aba9de621e670d3c02fc4f4ed10717326dc80
Author: Debarshi Ray <debarshir gnome org>
Date:   Thu Mar 15 16:06:31 2012 +0100

    oauth2provider: Provide a default implementation for get_token_uri
    
    OAuth2 providers (eg., Facebook) that offer a client-side flow do not
    need this. It is only needed for the server-side flow. The default
    implementation returns NULL.
    
    Removed the implementation from the Facebook provider.

 src/goabackend/goafacebookprovider.c |   11 -----------
 src/goabackend/goaoauth2provider.c   |   21 +++++++++++++++++----
 src/goabackend/goaoauth2provider.h   |    4 ++--
 3 files changed, 19 insertions(+), 17 deletions(-)
---
diff --git a/src/goabackend/goafacebookprovider.c b/src/goabackend/goafacebookprovider.c
index 83a3bd2..c099710 100644
--- a/src/goabackend/goafacebookprovider.c
+++ b/src/goabackend/goafacebookprovider.c
@@ -109,16 +109,6 @@ get_authorization_uri (GoaOAuth2Provider *provider)
   return "https://www.facebook.com/dialog/oauth";;
 }
 
-
-static const gchar *
-get_token_uri (GoaOAuth2Provider *provider)
-{
-  /* Not used in client-side auth flow, since the access token is obtained
-   * directly from the authorization phase (get_authorization_uri()) */
-  return NULL;
-}
-
-
 static const gchar *
 get_redirect_uri (GoaOAuth2Provider *provider)
 {
@@ -352,7 +342,6 @@ goa_facebook_provider_class_init (GoaFacebookProviderClass *klass)
 
   oauth2_class = GOA_OAUTH2_PROVIDER_CLASS (klass);
   oauth2_class->get_authorization_uri    = get_authorization_uri;
-  oauth2_class->get_token_uri            = get_token_uri;
   oauth2_class->build_authorization_uri  = build_authorization_uri;
   oauth2_class->get_redirect_uri         = get_redirect_uri;
   oauth2_class->get_scope                = get_scope;
diff --git a/src/goabackend/goaoauth2provider.c b/src/goabackend/goaoauth2provider.c
index 0ee82d3..800fa7a 100644
--- a/src/goabackend/goaoauth2provider.c
+++ b/src/goabackend/goaoauth2provider.c
@@ -1,6 +1,6 @@
 /* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
 /*
- * Copyright (C) 2011 Red Hat, Inc.
+ * Copyright (C) 2011, 2012 Red Hat, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ -235,6 +235,14 @@ goa_oauth2_provider_get_authorization_uri (GoaOAuth2Provider *provider)
   return GOA_OAUTH2_PROVIDER_GET_CLASS (provider)->get_authorization_uri (provider);
 }
 
+/* ---------------------------------------------------------------------------------------------------- */
+
+static const gchar *
+goa_oauth2_provider_get_token_uri_default (GoaOAuth2Provider  *provider)
+{
+  return NULL;
+}
+
 /**
  * goa_oauth2_provider_get_token_uri:
  * @provider: A #GoaOAuth2Provider.
@@ -243,10 +251,13 @@ goa_oauth2_provider_get_authorization_uri (GoaOAuth2Provider *provider)
  * url="http://tools.ietf.org/html/draft-ietf-oauth-v2-15#section-2.2";>token
  * endpoint</ulink> used for obtaining an access token.
  *
- * You should not include any parameters in the returned URI.
+ * A token URI is only needed when the OAuth2 provider does not support
+ * a separate client-side flow. In such cases, override
+ * #GoaOAuth2ProviderClass.get_token_uri. You should not include any
+ * parameters in the returned URI.
  *
- * This is a pure virtual method - a subclass must provide an
- * implementation.
+ * This is a virtual method where the default implementation returns
+ * %NULL.
  *
  * Returns: (transfer none): A string owned by @provider - do not free.
  */
@@ -257,6 +268,8 @@ goa_oauth2_provider_get_token_uri (GoaOAuth2Provider *provider)
   return GOA_OAUTH2_PROVIDER_GET_CLASS (provider)->get_token_uri (provider);
 }
 
+/* ---------------------------------------------------------------------------------------------------- */
+
 /**
  * goa_oauth2_provider_get_redirect_uri:
  * @provider: A #GoaOAuth2Provider.
diff --git a/src/goabackend/goaoauth2provider.h b/src/goabackend/goaoauth2provider.h
index 67c3523..c8a4bbf 100644
--- a/src/goabackend/goaoauth2provider.h
+++ b/src/goabackend/goaoauth2provider.h
@@ -1,6 +1,6 @@
 /* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
 /*
- * Copyright (C) 2011 Red Hat, Inc.
+ * Copyright (C) 2011, 2012 Red Hat, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ -77,7 +77,6 @@ struct _GoaOAuth2ProviderClass
 
   /* pure virtual */
   const gchar *(*get_authorization_uri)    (GoaOAuth2Provider  *provider);
-  const gchar *(*get_token_uri)            (GoaOAuth2Provider  *provider);
   const gchar *(*get_redirect_uri)         (GoaOAuth2Provider  *provider);
   const gchar *(*get_scope)                (GoaOAuth2Provider  *provider);
   const gchar *(*get_client_id)            (GoaOAuth2Provider  *provider);
@@ -94,6 +93,7 @@ struct _GoaOAuth2ProviderClass
                                             const gchar        *escaped_redirect_uri,
                                             const gchar        *escaped_client_id,
                                             const gchar        *escaped_scope);
+  const gchar *(*get_token_uri)            (GoaOAuth2Provider  *provider);
   gboolean     (*get_use_external_browser) (GoaOAuth2Provider  *provider);
   void         (*add_account_key_values)   (GoaOAuth2Provider  *provider,
                                             GVariantBuilder    *builder);