printing: Fix getting info for standalone IPP printers

Create printer name from name of the advertised service
for standalone IPP printers as opposed to CUPS printers
advertised via Avahi which get name from their
resource path.
This is similar to what cups-filters does.

Pass GtkPrinter class to request for printer info
so that it does not need to be searched for
(such search could fail for standalone IPP printers).

https://gitlab.gnome.org/GNOME/gtk/issues/1509

modules/printbackends/gtkprintbackendcups.c

@@ -81,6 +81,8 @@ typedef struct _GtkPrintBackendCupsClass GtkPrintBackendCupsClass;
 #define AVAHI_SERVER_IFACE "org.freedesktop.Avahi.Server"
 #define AVAHI_SERVICE_BROWSER_IFACE "org.freedesktop.Avahi.ServiceBrowser"
 #define AVAHI_SERVICE_RESOLVER_IFACE "org.freedesktop.Avahi.ServiceResolver"
+
+#define PRINTER_NAME_ALLOWED_CHARACTERS "abcdefghijklmnopqrtsuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-_"
 #endif
 
 /* define this to see warnings about ignored ppd options */
@@ -1961,6 +1963,7 @@ typedef struct
   gboolean remote_printer;
 #ifdef HAVE_CUPS_API_1_6
   gboolean avahi_printer;
+  gchar   *avahi_resource_path;
 #endif
   gchar  **auth_info_required;
   gint     default_number_up;
@@ -2406,8 +2409,19 @@ cups_create_printer (GtkPrintBackendCups *cups_backend,
   cups_printer = gtk_printer_cups_new (info->printer_name, backend, NULL);
 #endif
 
-  cups_printer->device_uri = g_strdup_printf ("/printers/%s",
-					      info->printer_name);
+#ifdef HAVE_CUPS_API_1_6
+  if (info->avahi_printer)
+    {
+      cups_printer->device_uri = g_strdup_printf ("/%s",
+                                                  info->avahi_resource_path);
+    }
+  else
+#else
+    {
+      cups_printer->device_uri = g_strdup_printf ("/printers/%s",
+                                                  info->printer_name);
+    }
+#endif
 
   /* Check to see if we are looking at a class */
   if (info->member_uris)
@@ -2656,17 +2670,33 @@ set_default_printer (GtkPrintBackendCups *cups_backend,
 }
 
 #ifdef HAVE_CUPS_API_1_6
+typedef struct {
+  GtkPrinterCups *printer;
+  http_t         *http;
+} RequestPrinterInfoData;
+
+static void
+request_printer_info_data_free (RequestPrinterInfoData *data)
+{
+  GTK_NOTE (PRINTING,
+            g_print ("CUPS Backend: %s\n", G_STRFUNC));
+  httpClose (data->http);
+  g_object_unref (data->printer);
+  g_free (data);
+}
+
 static void
 cups_request_printer_info_cb (GtkPrintBackendCups *cups_backend,
                               GtkCupsResult       *result,
                               gpointer             user_data)
 {
-  PrinterSetupInfo *info = g_slice_new0 (PrinterSetupInfo);
-  GtkPrintBackend  *backend = GTK_PRINT_BACKEND (cups_backend);
-  ipp_attribute_t  *attr;
-  GtkPrinter       *printer;
-  gboolean          status_changed = FALSE;
-  ipp_t            *response;
+  RequestPrinterInfoData *data = (RequestPrinterInfoData *) user_data;
+  PrinterSetupInfo       *info = g_slice_new0 (PrinterSetupInfo);
+  GtkPrintBackend        *backend = GTK_PRINT_BACKEND (cups_backend);
+  ipp_attribute_t        *attr;
+  GtkPrinter             *printer = g_object_ref (GTK_PRINTER (data->printer));
+  gboolean                status_changed = FALSE;
+  ipp_t                  *response;
 
   GTK_NOTE (PRINTING,
             g_print ("CUPS Backend: %s\n", G_STRFUNC));
@@ -2699,12 +2729,6 @@ cups_request_printer_info_cb (GtkPrintBackendCups *cups_backend,
         {
           set_info_state_message (info);
 
-          printer = gtk_print_backend_find_printer (backend, info->printer_name);
-          if (printer != NULL)
-            g_object_ref (printer);
-          else
-            goto done;
-
           if (info->got_printer_type &&
               info->default_printer &&
               cups_backend->avahi_default_printer == NULL)
@@ -2752,13 +2776,12 @@ cups_request_printer_info_cb (GtkPrintBackendCups *cups_backend,
           if (status_changed)
             g_signal_emit_by_name (GTK_PRINT_BACKEND (backend),
                                    "printer-status-changed", printer);
-
-          /* The ref is held by GtkPrintBackend, in add_printer() */
-          g_object_unref (printer);
         }
     }
 
 done:
+  g_object_unref (printer);
+
   if (!cups_backend->got_default_printer &&
       gtk_print_backend_printer_list_is_done (backend) &&
       cups_backend->avahi_default_printer != NULL)
@@ -2770,17 +2793,20 @@ done:
 }
 
 static void
-cups_request_printer_info (const gchar         *printer_uri,
-                           const gchar         *host,
-                           gint                 port,
-                           GtkPrintBackendCups *backend)
+cups_request_printer_info (GtkPrinterCups *printer)
 {
-  GtkCupsRequest *request;
-  http_t         *http;
+  RequestPrinterInfoData *data;
+  GtkPrintBackendCups    *backend = GTK_PRINT_BACKEND_CUPS (gtk_printer_get_backend (GTK_PRINTER (printer)));
+  GtkCupsRequest         *request;
+  http_t                 *http;
 
-  http = httpConnect (host, port);
-  if (http)
+  http = httpConnect (printer->hostname, printer->port);
+  if (http != NULL)
     {
+      data = g_new0 (RequestPrinterInfoData, 1);
+      data->http = http;
+      data->printer = g_object_ref (printer);
+
       request = gtk_cups_request_new_with_username (http,
                                                     GTK_CUPS_POST,
                                                     IPP_GET_PRINTER_ATTRIBUTES,
@@ -2792,7 +2818,7 @@ cups_request_printer_info (const gchar         *printer_uri,
       gtk_cups_request_set_ipp_version (request, 1, 1);
 
       gtk_cups_request_ipp_add_string (request, IPP_TAG_OPERATION, IPP_TAG_URI,
-                                       "printer-uri", NULL, printer_uri);
+                                       "printer-uri", NULL, printer->printer_uri);
 
       gtk_cups_request_ipp_add_strings (request, IPP_TAG_OPERATION, IPP_TAG_KEYWORD,
                                         "requested-attributes", G_N_ELEMENTS (printer_attrs_detailed),
@@ -2801,8 +2827,8 @@ cups_request_printer_info (const gchar         *printer_uri,
       cups_request_execute (backend,
                             request,
                             (GtkPrintCupsResponseCallbackFunc) cups_request_printer_info_cb,
-                            http,
-                            (GDestroyNotify) httpClose);
+                            data,
+                            (GDestroyNotify) request_printer_info_data_free);
     }
 }
 
@@ -2814,6 +2840,7 @@ typedef struct
   gint                 port;
   gchar               *printer_name;
   gchar               *name;
+  gchar               *resource_path;
   gboolean             got_printer_type;
   guint                printer_type;
   gboolean             got_printer_state;
@@ -2880,6 +2907,10 @@ create_cups_printer_from_avahi_data (AvahiConnectionTestData *data)
   info->avahi_printer = TRUE;
   info->printer_name = data->printer_name;
   info->printer_uri = data->printer_uri;
+  info->avahi_resource_path = data->resource_path;
+  info->default_printer = FALSE;
+  info->remote_printer = TRUE;
+  info->is_accepting_jobs = TRUE;
 
   if (data->got_printer_state)
     {
@@ -2913,7 +2944,6 @@ create_cups_printer_from_avahi_data (AvahiConnectionTestData *data)
   set_info_state_message (info);
 
   printer = gtk_print_backend_find_printer (GTK_PRINT_BACKEND (data->backend), data->printer_name);
-
   if (printer == NULL && data->UUID != NULL)
     printer = find_printer_by_uuid (data->backend, data->UUID);
 
@@ -2937,6 +2967,7 @@ create_cups_printer_from_avahi_data (AvahiConnectionTestData *data)
       GTK_PRINTER_CUPS (printer)->avahi_name = g_strdup (data->name);
       GTK_PRINTER_CUPS (printer)->avahi_type = g_strdup (data->type);
       GTK_PRINTER_CUPS (printer)->avahi_domain = g_strdup (data->domain);
+      GTK_PRINTER_CUPS (printer)->printer_uri = g_strdup (data->printer_uri);
       g_free (GTK_PRINTER_CUPS (printer)->hostname);
       GTK_PRINTER_CUPS (printer)->hostname = g_strdup (data->host);
       GTK_PRINTER_CUPS (printer)->port = data->port;
@@ -2990,6 +3021,7 @@ avahi_connection_test_cb (GObject      *source_object,
   g_free (data->host);
   g_free (data->printer_name);
   g_free (data->name);
+  g_free (data->resource_path);
   g_free (data->type);
   g_free (data->domain);
   g_free (data);
@@ -3041,9 +3073,10 @@ avahi_service_resolver_cb (GObject      *source_object,
   guint32                  flags;
   guint16                  port;
   GError                  *error = NULL;
-  gchar                   *queue_name = NULL;
   gchar                   *tmp;
   gchar                   *printer_name;
+  gchar                  **printer_name_strv;
+  gchar                  **printer_name_compressed_strv;
   gchar                   *endptr;
   gchar                   *key;
   gchar                   *value;
@@ -3051,7 +3084,7 @@ avahi_service_resolver_cb (GObject      *source_object,
   gint                     interface;
   gint                     protocol;
   gint                     aprotocol;
-  gint                     i;
+  gint                     i, j;
 
   output = g_dbus_connection_call_finish (G_DBUS_CONNECTION (source_object),
                                           res,
@@ -3093,13 +3126,7 @@ avahi_service_resolver_cb (GObject      *source_object,
 
               if (g_strcmp0 (key, "rp") == 0)
                 {
-                  queue_name = g_strdup (value);
-
-                  printer_name = g_strrstr (queue_name, "/");
-                  if (printer_name != NULL)
-                    data->printer_name = g_strdup (printer_name + 1);
-                  else
-                    data->printer_name = g_strdup (queue_name);
+                  data->resource_path = g_strdup (value);
                 }
               else if (g_strcmp0 (key, "note") == 0)
                 {
@@ -3135,17 +3162,51 @@ avahi_service_resolver_cb (GObject      *source_object,
             }
         }
 
-      if (queue_name)
+      if (data->resource_path != NULL)
         {
+          if (data->got_printer_type &&
+              (g_strcmp0 (data->resource_path, "printers/") == 0 ||
+               g_strcmp0 (data->resource_path, "classes/") == 0))
+            {
+              /* This is a CUPS printer advertised via Avahi */
+              printer_name = g_strrstr (data->resource_path, "/");
+              if (printer_name != NULL && printer_name[0] != '\0')
+                data->printer_name = g_strdup (printer_name + 1);
+              else
+                data->printer_name = g_strdup (data->resource_path);
+            }
+          else
+            {
+              printer_name = g_strdup (name);
+              g_strcanon (printer_name, PRINTER_NAME_ALLOWED_CHARACTERS, '-');
+
+              printer_name_strv = g_strsplit_set (printer_name, "-", -1);
+              printer_name_compressed_strv = g_new0 (gchar *, g_strv_length (printer_name_strv));
+              for (i = 0, j = 0; printer_name_strv[i] != NULL; i++)
+                {
+                  if (printer_name_strv[i][0] != '\0')
+                    {
+                      printer_name_compressed_strv[j] = printer_name_strv[i];
+                      j++;
+                    }
+                }
+
+              data->printer_name = g_strjoinv ("-", printer_name_compressed_strv);
+
+              g_strfreev (printer_name_strv);
+              g_free (printer_name_compressed_strv);
+              g_free (printer_name);
+            }
+
           if (g_strcmp0 (type, "_ipp._tcp") == 0)
             protocol_string = "ipp";
           else
             protocol_string = "ipps";
 
           if (aprotocol == AVAHI_PROTO_INET6)
-            data->printer_uri = g_strdup_printf ("%s://[%s]:%u/%s", protocol_string, address, port, queue_name);
+            data->printer_uri = g_strdup_printf ("%s://[%s]:%u/%s", protocol_string, address, port, data->resource_path);
           else
-            data->printer_uri = g_strdup_printf ("%s://%s:%u/%s", protocol_string, address, port, queue_name);
+            data->printer_uri = g_strdup_printf ("%s://%s:%u/%s", protocol_string, address, port, data->resource_path);
 
           data->host = g_strdup (address);
           data->port = port;
@@ -3162,7 +3223,6 @@ avahi_service_resolver_cb (GObject      *source_object,
                                                  backend->avahi_cancellable,
                                                  avahi_connection_test_cb,
                                                  data);
-          g_free (queue_name);
         }
       else
         {
@@ -3817,10 +3877,7 @@ cups_request_ppd_cb (GtkPrintBackendCups *print_backend,
        ((gtk_cups_result_get_error_type (result) == GTK_CUPS_ERROR_HTTP) &&
          (gtk_cups_result_get_error_status (result) == HTTP_NOT_FOUND))))
     {
-      cups_request_printer_info (GTK_PRINTER_CUPS (printer)->printer_uri,
-                                 GTK_PRINTER_CUPS (printer)->hostname,
-                                 GTK_PRINTER_CUPS (printer)->port,
-                                 GTK_PRINT_BACKEND_CUPS (gtk_printer_get_backend (printer)));
+      cups_request_printer_info (GTK_PRINTER_CUPS (printer));
 
       return;
     }