[recipes] Use the new Email portal if available

[Matthias Clasen <matthiasc src gnome org>]

commit 6173a5b805ea758e75b00fccc376b24ec49fe1ae
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Feb 14 18:16:16 2017 -0500

    Use the new Email portal if available
    
    We fall back to using a mailto: uri if the portal
    is not present.

 src/gr-mail.c |  124 +++++++++++++++++++++++++++++++++++++++++++++++++++------
 1 files changed, 112 insertions(+), 12 deletions(-)
---
diff --git a/src/gr-mail.c b/src/gr-mail.c
index 1a0dc6e..f68dfb1 100644
--- a/src/gr-mail.c
+++ b/src/gr-mail.c
@@ -22,33 +22,133 @@
 
 #include "gr-mail.h"
 
-gboolean
-gr_send_mail (const char  *address,
-              const char  *subject,
-              const char  *body,
-              const char **attachments,
-              GError     **error)
+typedef struct {
+        char *address;
+        char *subject;
+        char *body;
+        char **attachments;
+} MailData;
+
+static void
+mail_data_free (gpointer data)
+{
+        MailData *md = data;
+
+        g_free (md->address);
+        g_free (md->subject);
+        g_free (md->body);
+        g_strfreev (md->attachments);
+        g_free (md);
+}
+
+static void
+send_mail_using_mailto (MailData *data)
 {
         g_autoptr(GString) url = NULL;
         g_autofree char *encoded_subject = NULL;
         g_autofree char *encoded_body = NULL;
         int i;
 
-        encoded_subject = g_uri_escape_string (subject ? subject : "", NULL, FALSE);
-        encoded_body = g_uri_escape_string (body ? body : "", NULL, FALSE);
+        encoded_subject = g_uri_escape_string (data->subject, NULL, FALSE);
+        encoded_body = g_uri_escape_string (data->body, NULL, FALSE);
 
         url = g_string_new ("mailto:";);
 
-        g_string_append_printf (url, "\"%s\"", address ? address : "");
+        g_string_append_printf (url, "\"%s\"", data->address);
         g_string_append_printf (url, "?subject=%s", encoded_subject);
         g_string_append_printf (url, "&body=%s", encoded_body);
 
-        for (i = 0; attachments[i]; i++) {
+        for (i = 0; data->attachments[i]; i++) {
                 g_autofree char *path = NULL;
 
-                path = g_uri_escape_string (attachments[i], NULL, FALSE);
+                path = g_uri_escape_string (data->attachments[i], NULL, FALSE);
                 g_string_append_printf (url, "&attach=%s", path);
         }
 
-        return g_app_info_launch_default_for_uri (url->str, NULL, error);
+        g_app_info_launch_default_for_uri (url->str, NULL, NULL);
+
+        mail_data_free (data);
+}
+
+static GDBusProxy *
+get_mail_portal_proxy (void)
+{
+        static GDBusProxy *proxy = NULL;
+
+        if (proxy == NULL)
+                proxy = g_dbus_proxy_new_for_bus_sync (G_BUS_TYPE_SESSION,
+                                                       G_DBUS_PROXY_FLAGS_NONE,
+                                                       NULL,
+                                                       "org.freedesktop.portal.Desktop",
+                                                       "/org/freedesktop/portal/desktop",
+                                                       "org.freedesktop.portal.Email",
+                                                       NULL, NULL);
+
+        return proxy;
+}
+
+static void
+callback (GObject      *source,
+          GAsyncResult *result,
+          gpointer      data)
+{
+        g_autoptr(GVariant) reply = NULL;
+        g_autoptr(GError) error = NULL;
+        MailData *md = data;
+
+        reply = g_dbus_proxy_call_finish (G_DBUS_PROXY (source), result, &error);
+        if (g_error_matches (error, G_DBUS_ERROR, G_DBUS_ERROR_UNKNOWN_INTERFACE) ||
+            g_error_matches (error, G_DBUS_ERROR, G_DBUS_ERROR_UNKNOWN_METHOD)) {
+                /* Email portal not present, fall back to mailto: */
+                send_mail_using_mailto (md);
+                return;
+        }
+
+        mail_data_free (md);
+}
+
+static void
+send_mail_using_mail_portal (MailData *data)
+{
+        GVariantBuilder opt_builder;
+        GDBusProxy *proxy;
+
+        proxy = get_mail_portal_proxy ();
+
+        g_variant_builder_init (&opt_builder, G_VARIANT_TYPE ("a{sv}"));
+        g_variant_builder_add (&opt_builder, "{sv}", "address", g_variant_new_string (data->address));
+        g_variant_builder_add (&opt_builder, "{sv}", "subject", g_variant_new_string (data->subject));
+        g_variant_builder_add (&opt_builder, "{sv}", "body", g_variant_new_string (data->body));
+        g_variant_builder_add (&opt_builder, "{sv}", "attachments", g_variant_new_strv ((const char * const 
*)data->attachments, -1));
+
+        g_dbus_proxy_call (proxy,
+                           "ComposeEmail",
+                           g_variant_new ("(sa{sv})",
+                                          "",
+                                          &opt_builder),
+                           G_DBUS_CALL_FLAGS_NONE,
+                           G_MAXINT,
+                           NULL,
+                           callback,
+                           data);
+}
+
+gboolean
+gr_send_mail (const char  *address,
+              const char  *subject,
+              const char  *body,
+              const char **attachments,
+              GError     **error)
+{
+        MailData *data;
+
+        data = g_new (MailData, 1);
+        data->address = g_strdup (address ? address : "");
+        data->subject = g_strdup (subject ? subject : "");
+        data->body = g_strdup (body ? body : "");
+        data->attachments = g_strdupv ((char **)attachments);
+
+        send_mail_using_mail_portal (data);
+
+        return TRUE;
 }