[epiphany/wip/view-source: 1/2] Revert "Fully remove view source handler..."

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 46dbdb9fb247bfc70cb2db10ce39151acd368f2d
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Sat Feb 11 19:10:58 2017 -0600

    Revert "Fully remove view source handler..."
    
    This reverts commit 3f322c5419035d5cdf1d2c037cda3b0d299cbe2c.

 embed/ephy-view-source-handler.c |  230 ++++++++++++++++++++++++++++++++++++++
 embed/ephy-view-source-handler.h |   37 ++++++
 2 files changed, 267 insertions(+), 0 deletions(-)
---
diff --git a/embed/ephy-view-source-handler.c b/embed/ephy-view-source-handler.c
new file mode 100644
index 0000000..af62769
--- /dev/null
+++ b/embed/ephy-view-source-handler.c
@@ -0,0 +1,230 @@
+/* -*- Mode: C; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/*
+ *  Copyright © 2016 Igalia S.L.
+ *
+ *  This file is part of Epiphany.
+ *
+ *  Epiphany is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  Epiphany 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 General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with Epiphany.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+#include "ephy-view-source-handler.h"
+
+#include "ephy-embed-shell.h"
+
+#include <gio/gio.h>
+#include <string.h>
+
+struct _EphyViewSourceHandler {
+  GObject parent_instance;
+
+  GList *outstanding_requests;
+};
+
+G_DEFINE_TYPE (EphyViewSourceHandler, ephy_view_source_handler, G_TYPE_OBJECT)
+
+typedef struct {
+  EphyViewSourceHandler *source_handler;
+  WebKitURISchemeRequest *scheme_request;
+  WebKitWebView *web_view;
+  GCancellable *cancellable;
+  guint load_changed_id;
+} EphyViewSourceRequest;
+
+static EphyViewSourceRequest *
+ephy_view_source_request_new (EphyViewSourceHandler  *handler,
+                              WebKitURISchemeRequest *request)
+{
+  EphyViewSourceRequest *view_source_request;
+  EphyEmbedShell *shell = ephy_embed_shell_get_default ();
+  WebKitWebContext *context = ephy_embed_shell_get_web_context (shell);
+
+  view_source_request = g_slice_new (EphyViewSourceRequest);
+  view_source_request->source_handler = handler;
+  view_source_request->scheme_request = g_object_ref (request);
+  view_source_request->web_view = g_object_ref_sink (webkit_web_view_new_with_context (context));
+  view_source_request->cancellable = g_cancellable_new ();
+  view_source_request->load_changed_id = 0;
+
+  return view_source_request;
+}
+
+static void
+ephy_view_source_request_free (EphyViewSourceRequest *request)
+{
+  if (request->load_changed_id > 0)
+    g_signal_handler_disconnect (request->web_view, request->load_changed_id);
+
+  g_object_unref (request->scheme_request);
+  g_object_unref (request->web_view);
+
+  g_cancellable_cancel (request->cancellable);
+  g_object_unref (request->cancellable);
+
+  g_slice_free (EphyViewSourceRequest, request);
+}
+
+static void
+finish_uri_scheme_request (EphyViewSourceRequest *request,
+                           gchar                 *data)
+{
+  GInputStream *stream;
+  gssize data_length;
+
+  data_length = MIN (strlen (data), G_MAXSSIZE);
+  stream = g_memory_input_stream_new_from_data (data, data_length, g_free);
+  webkit_uri_scheme_request_finish (request->scheme_request, stream, data_length, "text/html");
+
+  request->source_handler->outstanding_requests =
+      g_list_remove (request->source_handler->outstanding_requests,
+                     request);
+
+  ephy_view_source_request_free (request);
+  g_object_unref (stream);
+}
+
+static void
+web_resource_data_cb (WebKitWebResource     *resource,
+                      GAsyncResult          *result,
+                      EphyViewSourceRequest *request)
+{
+  guchar *data;
+  char *data_str;
+  char *escaped_str;
+  char *html;
+  gsize length;
+  GError *error = NULL;
+
+  data = webkit_web_resource_get_data_finish (resource, result, &length, &error);
+  if (error) {
+    html = g_strdup (error->message);
+    length = strlen (html);
+    g_error_free (error);
+    finish_uri_scheme_request (request, html);
+    return;
+  }
+
+  data_str = g_malloc (length + 1);
+  strncpy (data_str, (const char *)data, length);
+  data_str[length] = '\0';
+  g_free (data);
+
+  escaped_str = g_markup_escape_text (data_str, -1);
+  g_free (data_str);
+
+  html = g_strdup_printf ("<body>"
+                            "<pre>"
+                              "<code class=\"language-html\">%s</code>"
+                            "</pre>"
+                          "</body>",
+                          escaped_str);
+  g_free (escaped_str);
+
+  finish_uri_scheme_request (request, html);
+}
+
+static void
+load_changed_cb (WebKitWebView         *web_view,
+                 WebKitLoadEvent        load_event,
+                 EphyViewSourceRequest *request)
+{
+  if (load_event == WEBKIT_LOAD_FINISHED) {
+    WebKitWebResource *resource = webkit_web_view_get_main_resource (web_view);
+    webkit_web_resource_get_data (resource,
+                                  request->cancellable,
+                                  (GAsyncReadyCallback)(web_resource_data_cb),
+                                  request);
+  }
+}
+
+static void
+ephy_view_source_request_start (EphyViewSourceRequest *request)
+{
+  SoupURI *soup_uri;
+  char *modified_uri;
+  char *decoded_fragment;
+  const char *original_uri;
+
+  request->source_handler->outstanding_requests =
+      g_list_prepend (request->source_handler->outstanding_requests, request);
+
+  original_uri = webkit_uri_scheme_request_get_uri (request->scheme_request);
+  soup_uri = soup_uri_new (original_uri);
+
+  if (!soup_uri) {
+    g_critical ("Failed to construct SoupURI for %s", original_uri);
+    finish_uri_scheme_request (request, g_strdup (""));
+    return;
+  }
+
+  /* Convert e.g. ephy-source://gnome.org#https to https://gnome.org */
+  g_assert (soup_uri->fragment);
+  decoded_fragment = soup_uri_decode (soup_uri->fragment);
+  soup_uri_set_scheme (soup_uri, decoded_fragment);
+  soup_uri_set_fragment (soup_uri, NULL);
+  modified_uri = soup_uri_to_string (soup_uri, FALSE);
+
+  g_assert(request->load_changed_id == 0);
+  request->load_changed_id = g_signal_connect (request->web_view, "load-changed",
+                                               G_CALLBACK (load_changed_cb),
+                                               request);
+
+  webkit_web_view_load_uri (request->web_view, modified_uri);
+
+  g_free (decoded_fragment);
+  g_free (modified_uri);
+  soup_uri_free (soup_uri);
+}
+
+static void
+ephy_view_source_handler_dispose (GObject *object)
+{
+  EphyViewSourceHandler *handler = EPHY_VIEW_SOURCE_HANDLER (object);
+
+  if (handler->outstanding_requests) {
+    g_list_free_full (handler->outstanding_requests, (GDestroyNotify)ephy_view_source_request_free);
+    handler->outstanding_requests = NULL;
+  }
+
+  G_OBJECT_CLASS (ephy_view_source_handler_parent_class)->dispose (object);
+}
+
+static void
+ephy_view_source_handler_init (EphyViewSourceHandler *handler)
+{
+}
+
+static void
+ephy_view_source_handler_class_init (EphyViewSourceHandlerClass *klass)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (klass);
+
+  object_class->dispose = ephy_view_source_handler_dispose;
+}
+
+EphyViewSourceHandler *
+ephy_view_source_handler_new (void)
+{
+  return EPHY_VIEW_SOURCE_HANDLER (g_object_new (EPHY_TYPE_VIEW_SOURCE_HANDLER, NULL));
+}
+
+void
+ephy_view_source_handler_handle_request (EphyViewSourceHandler  *handler,
+                                         WebKitURISchemeRequest *scheme_request)
+{
+  EphyViewSourceRequest *view_source_request;
+
+  view_source_request = ephy_view_source_request_new (handler, scheme_request);
+  ephy_view_source_request_start (view_source_request);
+}
diff --git a/embed/ephy-view-source-handler.h b/embed/ephy-view-source-handler.h
new file mode 100644
index 0000000..268b0cc
--- /dev/null
+++ b/embed/ephy-view-source-handler.h
@@ -0,0 +1,37 @@
+/* -*- Mode: C; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/*
+ *  Copyright © 2016 Igalia S.L.
+ *
+ *  This file is part of Epiphany.
+ *
+ *  Epiphany is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  Epiphany 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 General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with Epiphany.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <webkit2/webkit2.h>
+
+G_BEGIN_DECLS
+
+#define EPHY_TYPE_VIEW_SOURCE_HANDLER (ephy_view_source_handler_get_type ())
+
+G_DECLARE_FINAL_TYPE (EphyViewSourceHandler, ephy_view_source_handler, EPHY, VIEW_SOURCE_HANDLER, GObject)
+
+#define EPHY_VIEW_SOURCE_SCHEME "ephy-source"
+
+EphyViewSourceHandler *ephy_view_source_handler_new            (void);
+
+void                   ephy_view_source_handler_handle_request (EphyViewSourceHandler  *handler,
+                                                                WebKitURISchemeRequest *request);
+G_END_DECLS