Fix reload buttons on error pages

The encoded URL here does not work. And we cannot reload via the web
process, because the window.location is about:blank for alternate HTML,
so we'll have to send a message to the UI process to have it do so
instead.

Fixes #1663

Part-of: <https://gitlab.gnome.org/GNOME/epiphany/-/merge_requests/1050>

2 files changed, 114 insertions, 59 deletions

diff --git a/embed/ephy-embed-shell.c b/embed/ephy-embed-shell.c
index 189370bd8..99d1fb0ef 100644
--- a/embed/ephy-embed-shell.c
+++ b/embed/ephy-embed-shell.c
@@ -78,6 +78,7 @@ enum {
   WEB_VIEW_CREATED,
   ALLOW_TLS_CERTIFICATE,
   ALLOW_UNSAFE_BROWSING,
+  RELOAD_PAGE,
   PASSWORD_FORM_FOCUSED,
 
   LAST_SIGNAL
@@ -310,6 +311,17 @@ web_process_extension_tls_error_page_message_received_cb (WebKitUserContentManag
 }
 
 static void
+web_process_extension_reload_page_message_received_cb (WebKitUserContentManager *manager,
+                                                       WebKitJavascriptResult   *message,
+                                                       EphyEmbedShell           *shell)
+{
+  guint64 page_id;
+
+  page_id = jsc_value_to_double (webkit_javascript_result_get_js_value (message));
+  g_signal_emit (shell, signals[RELOAD_PAGE], 0, page_id);
+}
+
+static void
 web_process_extension_unsafe_browsing_error_page_message_received_cb (WebKitUserContentManager *manager,
                                                                       WebKitJavascriptResult   *message,
                                                                       EphyEmbedShell           *shell)
@@ -1171,6 +1183,23 @@ ephy_embed_shell_class_init (EphyEmbedShellClass *klass)
                   G_TYPE_UINT64);
 
   /**
+   * EphyEmbedShell::reload-page:
+   * @shell: the #EphyEmbedShell
+   * @page_id: the identifier of the web page
+   *
+   * Emitted when the web process extension requests a view be reloaded.
+   * This is needed when window.location.reload() doesn't work properly,
+   * specifically after loading alternate HTML.
+   */
+  signals[RELOAD_PAGE] =
+    g_signal_new ("reload-page",
+                  EPHY_TYPE_EMBED_SHELL,
+                  G_SIGNAL_RUN_FIRST,
+                  0, NULL, NULL, NULL,
+                  G_TYPE_NONE, 1,
+                  G_TYPE_UINT64);
+
+  /**
    * EphyEmbedShell::password-form-focused
    * @shell: the #EphyEmbedShell
    * @page_id: the identifier of the web page
@@ -1408,6 +1437,7 @@ ephy_embed_shell_register_ucm_handler (EphyEmbedShell           *shell,
   EphyEmbedShellPrivate *priv = ephy_embed_shell_get_instance_private (shell);
 
   /* User content manager */
+  /* FIXME: See https://gitlab.gnome.org/GNOME/epiphany/-/issues/1664 */
   webkit_user_content_manager_register_script_message_handler_in_world (ucm,
                                                                         "overview",
                                                                         priv->guid);
@@ -1422,6 +1452,12 @@ ephy_embed_shell_register_ucm_handler (EphyEmbedShell           *shell,
                            shell, 0);
 
   webkit_user_content_manager_register_script_message_handler (ucm,
+                                                               "reloadPage");
+  g_signal_connect_object (ucm, "script-message-received::reloadPage",
+                           G_CALLBACK (web_process_extension_reload_page_message_received_cb),
+                           shell, 0);
+
+  webkit_user_content_manager_register_script_message_handler (ucm,
                                                                "unsafeBrowsingErrorPage");
   g_signal_connect_object (ucm, "script-message-received::unsafeBrowsingErrorPage",
                            G_CALLBACK (web_process_extension_unsafe_browsing_error_page_message_received_cb),
diff --git a/embed/ephy-web-view.c b/embed/ephy-web-view.c
index ae8413e94..98e3e1533 100644
--- a/embed/ephy-web-view.c
+++ b/embed/ephy-web-view.c
@@ -671,6 +671,17 @@ allow_unsafe_browsing_cb (EphyEmbedShell *shell,
 }
 
 static void
+reload_page_cb (EphyEmbedShell *shell,
+                guint64         page_id,
+                EphyWebView    *view)
+{
+  if (webkit_web_view_get_page_id (WEBKIT_WEB_VIEW (view)) != page_id)
+    return;
+
+  webkit_web_view_reload (WEBKIT_WEB_VIEW (view));
+}
+
+static void
 _ephy_web_view_set_is_blank (EphyWebView *view,
                              gboolean     is_blank)
 {
@@ -1846,20 +1857,20 @@ ephy_web_view_get_error_page (EphyWebView *view)
  * strings. Everywhere, but also here on the error pages in particular. */
 
 static void
-format_network_error_page (const char  *uri,
-                           const char  *origin,
-                           const char  *reason,
-                           char       **page_title,
-                           char       **message_title,
-                           char       **message_body,
-                           char       **message_details,
-                           char       **button_label,
-                           char       **button_action,
-                           const char **button_accesskey,
-                           const char **icon_name,
-                           const char **style)
+format_network_error_page (EphyWebView  *view,
+                           const char   *uri,
+                           const char   *origin,
+                           const char   *reason,
+                           char        **page_title,
+                           char        **message_title,
+                           char        **message_body,
+                           char        **message_details,
+                           char        **button_label,
+                           char        **button_action,
+                           const char  **button_accesskey,
+                           const char  **icon_name,
+                           const char  **style)
 {
-  g_autofree char *encoded_uri = NULL;
   g_autofree char *encoded_origin = NULL;
   g_autofree char *formatted_origin = NULL;
   g_autofree char *formatted_reason = NULL;
@@ -1895,8 +1906,8 @@ format_network_error_page (const char  *uri,
 
   /* The button on the network error page. DO NOT ADD MNEMONICS HERE. */
   *button_label = g_strdup (_("Reload"));
-  encoded_uri = ephy_encode_for_javascript (uri);
-  *button_action = g_strdup_printf ("window.location = '%s';", encoded_uri);
+  *button_action = g_strdup_printf ("window.webkit.messageHandlers.reloadPage.postMessage(%" G_GUINT64_FORMAT ");",
+                                    webkit_web_view_get_page_id (WEBKIT_WEB_VIEW (view)));
   /* Mnemonic for the Reload button on browser error pages. */
   *button_accesskey = C_("reload-access-key", "R");
 
@@ -1905,18 +1916,18 @@ format_network_error_page (const char  *uri,
 }
 
 static void
-format_crash_error_page (const char  *uri,
-                         char       **page_title,
-                         char       **message_title,
-                         char       **message_body,
-                         char       **button_label,
-                         char       **button_action,
-                         const char **button_accesskey,
-                         const char **icon_name,
-                         const char **style)
-{
-  g_autofree char *html_encoded_uri = NULL;
-  g_autofree char *js_encoded_uri = NULL;
+format_crash_error_page (EphyWebView  *view,
+                         const char   *uri,
+                         char        **page_title,
+                         char        **message_title,
+                         char        **message_body,
+                         char        **button_label,
+                         char        **button_action,
+                         const char  **button_accesskey,
+                         const char  **icon_name,
+                         const char  **style)
+{
+  g_autofree char *encoded_uri = NULL;
   g_autofree char *formatted_uri = NULL;
   g_autofree char *formatted_distributor = NULL;
   g_autofree char *first_paragraph = NULL;
@@ -1928,8 +1939,8 @@ format_crash_error_page (const char  *uri,
   /* Message title when a site cannot be loaded due to a page crash error. */
   *message_title = g_strdup (_("Oops! There may be a problem"));
 
-  html_encoded_uri = ephy_encode_for_html_entity (uri);
-  formatted_uri = g_strdup_printf ("<strong>%s</strong>", html_encoded_uri);
+  encoded_uri = ephy_encode_for_html_entity (uri);
+  formatted_uri = g_strdup_printf ("<strong>%s</strong>", encoded_uri);
   /* Error details when a site cannot be loaded due to a page crash error. */
   first_paragraph = g_strdup_printf (_("The page %s may have caused Web to "
                                        "close unexpectedly."),
@@ -1948,8 +1959,8 @@ format_crash_error_page (const char  *uri,
 
   /* The button on the page crash error page. DO NOT ADD MNEMONICS HERE. */
   *button_label = g_strdup (_("Reload"));
-  js_encoded_uri = ephy_encode_for_javascript (uri);
-  *button_action = g_strdup_printf ("window.location = '%s';", js_encoded_uri);
+  *button_action = g_strdup_printf ("window.webkit.messageHandlers.reloadPage.postMessage(%" G_GUINT64_FORMAT ");",
+                                    webkit_web_view_get_page_id (WEBKIT_WEB_VIEW (view)));
   /* Mnemonic for the Reload button on browser error pages. */
   *button_accesskey = C_("reload-access-key", "R");
 
@@ -1958,17 +1969,17 @@ format_crash_error_page (const char  *uri,
 }
 
 static void
-format_process_crash_error_page (const char  *uri,
-                                 char       **page_title,
-                                 char       **message_title,
-                                 char       **message_body,
-                                 char       **button_label,
-                                 char       **button_action,
-                                 const char **button_accesskey,
-                                 const char **icon_name,
-                                 const char **style)
+format_process_crash_error_page (EphyWebView  *view,
+                                 const char   *uri,
+                                 char        **page_title,
+                                 char        **message_title,
+                                 char        **message_body,
+                                 char        **button_label,
+                                 char        **button_action,
+                                 const char  **button_accesskey,
+                                 const char  **icon_name,
+                                 const char  **style)
 {
-  g_autofree char *encoded_uri = NULL;
   const char *first_paragraph;
 
   /* Page title when a site cannot be loaded due to a process crash error. */
@@ -1984,8 +1995,8 @@ format_process_crash_error_page (const char  *uri,
 
   /* The button on the process crash error page. DO NOT ADD MNEMONICS HERE. */
   *button_label = g_strdup (_("Reload"));
-  encoded_uri = ephy_encode_for_javascript (uri);
-  *button_action = g_strdup_printf ("window.location = '%s';", encoded_uri);
+  *button_action = g_strdup_printf ("window.webkit.messageHandlers.reloadPage.postMessage(%" G_GUINT64_FORMAT ");",
+                                    webkit_web_view_get_page_id (WEBKIT_WEB_VIEW (view)));
   /* Mnemonic for the Reload button on browser error pages. */
   *button_accesskey = C_("reload-access-key", "R");
 
@@ -1994,17 +2005,17 @@ format_process_crash_error_page (const char  *uri,
 }
 
 static void
-format_unresponsive_process_error_page (const char  *uri,
-                                        char       **page_title,
-                                        char       **message_title,
-                                        char       **message_body,
-                                        char       **button_label,
-                                        char       **button_action,
-                                        const char **button_accesskey,
-                                        const char **icon_name,
-                                        const char **style)
+format_unresponsive_process_error_page (EphyWebView  *view,
+                                        const char   *uri,
+                                        char        **page_title,
+                                        char        **message_title,
+                                        char        **message_body,
+                                        char        **button_label,
+                                        char        **button_action,
+                                        const char  **button_accesskey,
+                                        const char  **icon_name,
+                                        const char  **style)
 {
-  g_autofree char *encoded_uri = NULL;
   const char *first_paragraph;
 
   /* Page title when web content has become unresponsive. */
@@ -2020,8 +2031,8 @@ format_unresponsive_process_error_page (const char  *uri,
 
   /* The button on the unresponsive process error page. DO NOT ADD MNEMONICS HERE. */
   *button_label = g_strdup (_("Reload"));
-  encoded_uri = ephy_encode_for_javascript (uri);
-  *button_action = g_strdup_printf ("window.location = '%s';", encoded_uri);
+  *button_action = g_strdup_printf ("window.webkit.messageHandlers.reloadPage.postMessage(%" G_GUINT64_FORMAT ");",
+                                    webkit_web_view_get_page_id (WEBKIT_WEB_VIEW (view)));
   /* Mnemonic for the Reload button on browser error pages. */
   *button_accesskey = C_("reload-access-key", "R");
 
@@ -2275,7 +2286,8 @@ ephy_web_view_load_error_page (EphyWebView          *view,
 
   switch (page) {
     case EPHY_WEB_VIEW_ERROR_PAGE_NETWORK_ERROR:
-      format_network_error_page (uri,
+      format_network_error_page (view,
+                                 uri,
                                  origin,
                                  reason,
                                  &page_title,
@@ -2289,7 +2301,8 @@ ephy_web_view_load_error_page (EphyWebView          *view,
                                  &style);
       break;
     case EPHY_WEB_VIEW_ERROR_PAGE_CRASH:
-      format_crash_error_page (uri,
+      format_crash_error_page (view,
+                               uri,
                                &page_title,
                                &msg_title,
                                &msg_body,
@@ -2300,7 +2313,8 @@ ephy_web_view_load_error_page (EphyWebView          *view,
                                &style);
       break;
     case EPHY_WEB_VIEW_ERROR_PROCESS_CRASH:
-      format_process_crash_error_page (uri,
+      format_process_crash_error_page (view,
+                                       uri,
                                        &page_title,
                                        &msg_title,
                                        &msg_body,
@@ -2311,7 +2325,8 @@ ephy_web_view_load_error_page (EphyWebView          *view,
                                        &style);
       break;
     case EPHY_WEB_VIEW_ERROR_UNRESPONSIVE_PROCESS:
-      format_unresponsive_process_error_page (uri,
+      format_unresponsive_process_error_page (view,
+                                              uri,
                                               &page_title,
                                               &msg_title,
                                               &msg_body,
@@ -4079,6 +4094,10 @@ ephy_web_view_init (EphyWebView *web_view)
   g_signal_connect_object (shell, "allow-unsafe-browsing",
                            G_CALLBACK (allow_unsafe_browsing_cb),
                            web_view, 0);
+
+  g_signal_connect_object (shell, "reload-page",
+                           G_CALLBACK (reload_page_cb),
+                           web_view, 0);
 }
 
 static void