src/about*, src/view-source.*: Move under src/schemes/

9 files changed, 765 insertions, 0 deletions

diff --git a/src/schemes/about.c b/src/schemes/about.c
new file mode 100644
index 0000000..49104a7
--- /dev/null
+++ b/src/schemes/about.c
@@ -0,0 +1,90 @@
+/*
+ * about: URI scheme
+ *
+ * Copyright (C) 2017  Patrick McDermott
+ *
+ * This file is part of Marquee.
+ *
+ * Marquee 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.
+ *
+ * Marquee 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 Marquee.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "about.h"
+
+#include <string.h>
+
+#include <webkit2/webkit2.h>
+
+#include "../application.h"
+#include "../utils/resources.h"
+#include "../utils/string.h"
+#include "about/paths.h"
+
+void
+mq_about_request(WebKitURISchemeRequest *request, MqApplication *application)
+{
+	const gchar *path;
+	gchar       *query_str;
+	GHashTable  *query;
+
+	path = webkit_uri_scheme_request_get_path(request);
+	query_str = strchr(webkit_uri_scheme_request_get_uri(request), '?');
+	if (query_str && query_str[1]) {
+		query_str = g_strdup(query_str + 1);
+		query = mq_parse_query_string(query_str);
+		g_free(query_str);
+	} else {
+		query = NULL;
+	}
+
+	if (g_strcmp0(path, "") == 0 || g_strcmp0(path, "version") == 0) {
+		mq_about_version_response(application, query, request);
+	} else if (g_strcmp0(path, "preferences") == 0) {
+		mq_about_preferences_response(application, query, request);
+	} else if (g_strcmp0(path, "marquee") == 0) {
+		mq_about_marquee_response(application, query, request);
+	} else if (g_str_has_prefix(path, "resources/")) {
+		mq_resource_response(application, path + sizeof("resources"),
+			request);
+	} else {
+		return;
+	}
+
+	if (query) {
+		g_hash_table_unref(query);
+	}
+}
+
+void
+mq_about_response(WebKitURISchemeRequest *request, gchar *contents)
+{
+	gsize         stream_length;
+	GInputStream *stream;
+
+	stream_length = strlen(contents);
+	stream = g_memory_input_stream_new_from_data(contents,
+		stream_length, g_free);
+	webkit_uri_scheme_request_finish(request, stream, stream_length,
+		"text/html");
+	g_object_unref(stream);
+}
+
+void
+mq_about_redirect(WebKitURISchemeRequest *request, const gchar *uri)
+{
+	WebKitWebView *web_view;
+
+	web_view = webkit_uri_scheme_request_get_web_view(request);
+	webkit_web_view_load_request(web_view, webkit_uri_request_new(uri));
+	mq_about_response(request, g_strdup(""));
+}
diff --git a/src/schemes/about.h b/src/schemes/about.h
new file mode 100644
index 0000000..ae224b8
--- /dev/null
+++ b/src/schemes/about.h
@@ -0,0 +1,39 @@
+/*
+ * about: URI scheme
+ *
+ * Copyright (C) 2017  Patrick McDermott
+ *
+ * This file is part of Marquee.
+ *
+ * Marquee 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.
+ *
+ * Marquee 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 Marquee.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef MQ_ABOUT_H
+#define MQ_ABOUT_H
+
+#include <glib.h>
+#include <webkit2/webkit2.h>
+
+#include "../application.h"
+
+void
+mq_about_request(WebKitURISchemeRequest *request, MqApplication *application);
+
+void
+mq_about_response(WebKitURISchemeRequest *request, gchar *contents);
+
+void
+mq_about_redirect(WebKitURISchemeRequest *request, const gchar *uri);
+
+#endif
diff --git a/src/schemes/about/local.mk b/src/schemes/about/local.mk
new file mode 100644
index 0000000..f2825f4
--- /dev/null
+++ b/src/schemes/about/local.mk
@@ -0,0 +1,4 @@
+marquee_SOURCES += \
+	%reldir%/version.c \
+	%reldir%/preferences.c \
+	%reldir%/marquee.c
diff --git a/src/schemes/about/marquee.c b/src/schemes/about/marquee.c
new file mode 100644
index 0000000..1ecbe08
--- /dev/null
+++ b/src/schemes/about/marquee.c
@@ -0,0 +1,74 @@
+/*
+ * about:marquee
+ *
+ * Copyright (C) 2017  Patrick McDermott
+ *
+ * This file is part of Marquee.
+ *
+ * Marquee 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.
+ *
+ * Marquee 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 Marquee.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <glib.h>
+#include <webkit2/webkit2.h>
+
+#include "../../application.h"
+#include "../about.h"
+#include "../paths.h"
+
+static const gchar *document =
+	"<!doctype html>"
+	"<html dir=\"%s\">"
+		"<head>"
+			"<meta charset=\"utf-8\">"
+			"<title>%s</title>"
+			"<style>"
+				"form {"
+					"text-align: center;"
+				"}"
+				"form > input[type=submit] {"
+					"margin: 32px;"
+					"padding: 16px;"
+					"background-color: #FF0000;"
+					"color: #FFFFFF;"
+					"font-weight: bold;"
+					"font-size: 64px;"
+				"}"
+			"</style>"
+		"</head>"
+		"<body>"
+			"<form>"
+				"<input type=\"submit\" name=\"toggle\""
+					"value=\"%s\">"
+			"</form>"
+		"</body>"
+	"</html>";
+
+void
+mq_about_marquee_response(MqApplication *application, GHashTable *query,
+	WebKitURISchemeRequest *request)
+{
+	if (query && g_hash_table_lookup(query, "toggle")) {
+		if (mq_application_marquee_mode_on(application)) {
+			mq_application_marquee_mode_deactivate(application);
+		} else {
+			mq_application_marquee_mode_activate(application);
+		}
+		mq_about_redirect(request, "mq-about:marquee");
+	} else {
+		mq_about_response(request, g_strdup_printf(document,
+				gtk_widget_get_default_direction() ==
+					GTK_TEXT_DIR_RTL ? "rtl" : "ltr",
+				"DANGER", "DO NOT PRESS"));
+	}
+}
diff --git a/src/schemes/about/paths.h b/src/schemes/about/paths.h
new file mode 100644
index 0000000..1208162
--- /dev/null
+++ b/src/schemes/about/paths.h
@@ -0,0 +1,41 @@
+/*
+ * about: URI paths
+ *
+ * Copyright (C) 2017  Patrick McDermott
+ *
+ * This file is part of Marquee.
+ *
+ * Marquee 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.
+ *
+ * Marquee 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 Marquee.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef MQ_ABOUT_PATHS_H
+#define MQ_ABOUT_PATHS_H
+
+#include <glib.h>
+
+#include "../../application.h"
+
+void
+mq_about_version_response(MqApplication *application, GHashTable *query,
+	WebKitURISchemeRequest *request);
+
+void
+mq_about_preferences_response(MqApplication *application, GHashTable *query,
+	WebKitURISchemeRequest *request);
+
+void
+mq_about_marquee_response(MqApplication *application, GHashTable *query,
+	WebKitURISchemeRequest *request);
+
+#endif
diff --git a/src/schemes/about/preferences.c b/src/schemes/about/preferences.c
new file mode 100644
index 0000000..669dd62
--- /dev/null
+++ b/src/schemes/about/preferences.c
@@ -0,0 +1,260 @@
+/*
+ * about:preferences
+ *
+ * Copyright (C) 2017  Patrick McDermott
+ *
+ * This file is part of Marquee.
+ *
+ * Marquee 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.
+ *
+ * Marquee 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 Marquee.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <glib.h>
+#include <webkit2/webkit2.h>
+
+#include "../../application.h"
+#include "../../config.h"
+#include "../../utils/html.h"
+#include "../about.h"
+#include "paths.h"
+
+static void
+save_pref(gchar *key, gchar *value, MqConfig *config)
+{
+	if (key[0] != '_') {
+		mq_config_set(config, key, value);
+	}
+}
+
+#define GEN_BOOL(NAME, LABEL) mq_html_input_checkbox(NAME, LABEL, \
+	mq_config_get_boolean(config, NAME))
+#define GEN_INT( NAME, LABEL, MIN, STEP, MAX) mq_html_input_number_i( \
+	NAME, LABEL, MIN, STEP, MAX, mq_config_get_integer(config, NAME))
+#define GEN_DBL( NAME, LABEL, MIN, STEP, MAX) mq_html_input_number_d( \
+	NAME, LABEL, MIN, STEP, MAX, mq_config_get_double(config, NAME))
+#define GEN_STR( NAME, LABEL) mq_html_input_text(NAME, LABEL, \
+	mq_config_get_string(config, NAME))
+#define GEN_STRL(NAME, LABEL) mq_html_input_text(NAME, LABEL, \
+	mq_config_get_string(config, NAME))
+#define GEN_SLCT(NAME, LABEL, ...) mq_html_input_select(NAME, LABEL, \
+	mq_config_get_string(config, NAME), NULL, NULL, __VA_ARGS__, NULL)
+
+static gchar *
+gen_page_general(MqConfig *config)
+{
+	return mq_html_container("div",
+		mq_html_h3("Web Browsing"),
+		GEN_SLCT("tabs.new",
+			"New Tab Page",
+			"home",  "Home Page",
+			"blank", "Blank Page"),
+		GEN_STR ("tabs.home",
+			"Home Page"),
+		GEN_BOOL("tabs.background",
+			"Open New Tabs in the Background"),
+		GEN_BOOL("tabs.warn-on-close",
+			"Warn When Closing Multiple Tabs or Windows"),
+
+		mq_html_h3("Navigation and Accessibility"),
+		GEN_BOOL("navigation.smooth-scrolling",
+			"Enable Smooth Scrolling"),
+		GEN_BOOL("navigation.tabbing",
+			"Enable Tabbing Navigation (Cycling Focus by Tab Key)"),
+		GEN_BOOL("navigation.caret",
+			"Enable Caret (Text Cursor) Navigation"),
+		GEN_BOOL("navigation.spatial",
+			"Enable Spatial Navigation Between Elements By Arrow "
+			"Keys"),
+
+		mq_html_h3("Spell Checking"),
+		GEN_BOOL("spell.enable",
+			"Enable Spell Checking"),
+		GEN_STRL("spell.langs",
+			"Spell Checking Languages"),
+
+		mq_html_h3("Miscellaneous"),
+		GEN_BOOL("display.textarea.resize.enable",
+			"Enable Resizable Text Areas"),
+		GEN_BOOL("devtools.enable",
+			"Enable Developer Tools"),
+
+		mq_html_h3("Compatibility"),
+		GEN_STR ("compatibility.user-agent",
+			"User Agent Identity"),
+		GEN_BOOL("compatibility.quirks",
+			"Enable Site-Specific Quirks"),
+		NULL);
+}
+
+static gchar *
+gen_page_display(MqConfig *config)
+{
+	return mq_html_container("div",
+		mq_html_h3("Fonts"),
+		GEN_STR ("font.family.default",
+			"Default Font Family"),
+		GEN_STR ("font.family.monospace",
+			"Default Monospace Font Family"),
+		GEN_STR ("font.family.serif",
+			"Default Serif Font Family"),
+		GEN_STR ("font.family.sans-serif",
+			"Default Sans-serif Font Family"),
+		GEN_STR ("font.family.cursive",
+			"Cursive Font Family"),
+		GEN_STR ("font.family.fantasy",
+			"Fantasy Font Family"),
+		GEN_STR ("font.family.pictograph",
+			"Pictograph Font Family"),
+		GEN_INT ("font.size.default",
+			"Default Font Size", 5, 1, 72),
+		GEN_INT ("font.size.monospace-default",
+			"Default Monospace Font Size", 5, 1, 72),
+		GEN_INT ("font.size.minimum",
+			"Minimum Font Size", 0, 1, 72),
+
+		mq_html_h3("Languages"),
+		GEN_STRL("intl.accept-languages",
+			"Preferred Web Site Languages"),
+		GEN_STR ("intl.default-charset",
+			"Default Character Set"),
+
+		mq_html_h3("Zoom"),
+		GEN_DBL ("zoom.default",
+			"Default Zoom Level", 0.00, 0.10, 10.00),
+		GEN_BOOL("zoom.text-only",
+			"Zoom Text Only"),
+		NULL);
+}
+
+static gchar *
+gen_page_permissions(MqConfig *config)
+{
+	return mq_html_container("div",
+		mq_html_h3("General"),
+		GEN_BOOL("permissions.images.auto-load",
+			"Automatically Load Images"),
+		GEN_BOOL("permissions.images.favicons.override",
+			"Always Load Icons Irrespective of Automatic Image "
+			"Loading"),
+		GEN_BOOL("permissions.java.enable",
+			"Enable Java"),
+		GEN_BOOL("permissions.javascript.enable",
+			"Enable JavaScript"),
+		GEN_BOOL("permissions.plugins.enable",
+			"Enable Plugins"),
+
+		mq_html_h3("JavaScript"),
+		GEN_BOOL("permissions.javascript.open-windows",
+			"Enable JavaScript to Open Windows"),
+		GEN_BOOL("permissions.javascript.fullscreen",
+			"Enable JavaScript to Display Elements Fullscreen"),
+		GEN_BOOL("permissions.javascript.modal-dialogs",
+			"Enable JavaScript to Show Modal Dialogs"),
+		GEN_BOOL("permissions.javascript.clipboard",
+			"Enable JavaScript to Access the Clipboard"),
+
+		mq_html_h3("Data Storage"),
+		GEN_BOOL("permissions.javascript.database",
+			"Enable Web Database"),
+		GEN_BOOL("permissions.javascript.storage",
+			"Enable Web Storage"),
+		GEN_BOOL("permissions.appcache",
+			"Enable Application Cache"),
+
+		mq_html_h3("Graphics and Multimedia"),
+		GEN_BOOL("canvas.acceleration.enable",
+			"Enable Hardware-Accelerated 2-D Canvas Drawing"),
+		GEN_BOOL("permissions.javascript.webgl",
+			"Enable JavaScript WebGL 3-D Graphics Rendering"),
+		GEN_BOOL("permissions.javascript.audio",
+			"Enable JavaScript to Process and Synthesize Audio"),
+		GEN_BOOL("media.autoplay",
+			"Enable Automatic Media Playback and Loading"),
+		GEN_BOOL("media.force-fullscreen",
+			"Force Media to Play Fullscreen"),
+		GEN_BOOL("permissions.javascript.mediastream.enable",
+			"Enable JavaScript to Access Audio and Video Devices"),
+		GEN_BOOL("permissions.javascript.mediasource.enable",
+			"Enable JavaScript to Generate Media Streams"),
+		NULL);
+}
+
+static gchar *
+gen_page_sec_and_priv(MqConfig *config)
+{
+	return mq_html_container("div",
+		mq_html_h3("History"),
+		GEN_BOOL("privacy.private-browsing.enabled",
+			"Enable Private Prowsing (Disables History, Cache, and "
+			"Form Auto-Filling)"),
+		GEN_BOOL("privacy.remember.history",
+			"Remember Browsing History"),
+		GEN_BOOL("privacy.remember.downloads",
+			"Remember Download History"),
+
+		mq_html_h3("Cookies"),
+		GEN_SLCT("cookies.accept",
+			"Accept Cookies",
+			"always",         "Always",
+			"never",          "Never",
+			"no-third-party", "No Third-Party"),
+
+		mq_html_h3("Security"),
+		GEN_BOOL("security.xss-auditor.enable",
+			"Attempt to Detect and Block Cross-Site Scripting "
+			"Attacks"),
+
+		mq_html_h3("Network"),
+		GEN_BOOL("dns.prefetch.enable",
+			"Prefetch Domain Name Resolutions for Better "
+			"Performance"),
+		NULL);
+}
+
+#undef GEN_BOOL
+#undef GEN_INT
+#undef GEN_DBL
+#undef GEN_STR
+#undef GEN_STRL
+
+void
+mq_about_preferences_response(MqApplication *application, GHashTable *query,
+	WebKitURISchemeRequest *request)
+{
+	MqConfig *config;
+	gchar    *document;
+
+	config = mq_application_get_config(application);
+
+	if (query) {
+		g_hash_table_foreach(query, (GHFunc) save_pref, config);
+		mq_config_save(config);
+		mq_about_redirect(request, "mq-about:preferences");
+	} else {
+		document = mq_html_document("Preferences",
+			mq_html_form("Save", "Cancel",
+				mq_html_notebook(FALSE, "notebook1", 0,
+					gen_page_general(config),
+					"General",
+					gen_page_display(config),
+					"Display",
+					gen_page_permissions(config),
+					"Permissions",
+					gen_page_sec_and_priv(config),
+					"Security and Privacy",
+					NULL),
+				NULL),
+			NULL);
+		mq_about_response(request, document);
+	}
+}
diff --git a/src/schemes/about/version.c b/src/schemes/about/version.c
new file mode 100644
index 0000000..8045ade
--- /dev/null
+++ b/src/schemes/about/version.c
@@ -0,0 +1,73 @@
+/*
+ * about:version
+ *
+ * Copyright (C) 2017  Patrick McDermott
+ *
+ * This file is part of Marquee.
+ *
+ * Marquee 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.
+ *
+ * Marquee 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 Marquee.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <glib.h>
+#include <webkit2/webkit2.h>
+
+#include "../../application.h"
+#include "../../utils/html.h"
+#include "../about.h"
+#include "paths.h"
+
+extern const char *PACKAGE_VERSION_GIT;
+
+void
+mq_about_version_response(MqApplication G_GNUC_UNUSED *application,
+	GHashTable G_GNUC_UNUSED *query,
+	WebKitURISchemeRequest *request)
+{
+	gchar *title;
+	gchar *document;
+
+	title = g_strdup_printf("About %s", PACKAGE_NAME);
+	document = mq_html_document(title,
+		mq_html_notebook(FALSE, "notebook1", 0,
+			mq_html_container("div",
+				mq_html_h3(PACKAGE_NAME),
+				mq_html_p_free(g_strconcat(PACKAGE_VERSION,
+					PACKAGE_VERSION_GIT, NULL)),
+				/* TODO: Comments */
+				/* TODO: Web site link */
+				mq_html_p("Copyright &copy; 2017 "
+					"Patrick McDermott"),
+				mq_html_p("This program comes with "
+					"ABSOLUTELY NO WARRANTY.  "
+					"See the license text for details."),
+				NULL),
+			"About",
+			mq_html_container("div",
+				mq_html_h3("Authors"),
+				mq_html_p("Patrick McDermott "
+					"&lt;pj@pehjota.net&gt;"),
+				NULL),
+			"Credits",
+			mq_html_input_iframe("mq-about:resources/"
+				"gpl-3.0-standalone.html"),
+			"License",
+			NULL),
+		NULL);
+	g_free(title);
+	mq_about_response(request, document);
+}
diff --git a/src/schemes/view-source.c b/src/schemes/view-source.c
new file mode 100644
index 0000000..b6cce86
--- /dev/null
+++ b/src/schemes/view-source.c
@@ -0,0 +1,150 @@
+/*
+ * view-source: URI scheme
+ *
+ * Copyright (C) 2017  Patrick McDermott
+ *
+ * This file is part of Marquee.
+ *
+ * Marquee 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.
+ *
+ * Marquee 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 Marquee.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "view-source.h"
+
+#include <string.h>
+
+#include <glib.h>
+#include <webkit2/webkit2.h>
+
+#include "../application.h"
+#include "../utils/resources.h"
+#include "../utils/string.h"
+
+typedef struct {
+	WebKitURISchemeRequest *request;
+	gchar                  *uri;
+	gulong                  handler_id;
+} DataSignalData;
+
+static const gchar *document =
+	"<!doctype html>\n"
+	"<html dir=\"%s\">\n"
+		"<head>\n"
+			"<meta charset=\"utf-8\">\n"
+			"<title>Source of %s</title>\n"
+			"<link rel=\"stylesheet\" type=\"text/css\" "
+				"media=\"all\" "
+				"href=\"view-source:resources/prism/"
+				"prism.css\">\n"
+			"<script src=\"view-source:resources/prism/"
+				"prism.js\"></script>\n"
+		"</head>\n"
+		"<body style=\"margin: 0;\">\n"
+			"<pre style=\"overflow: visible; width: 100%; "
+				"margin: 0;\">\n"
+				"<code class=\"language-markup line-numbers\" "
+					"style=\"overflow: visible;\">"
+					"%s</code>\n"
+			"</pre>\n"
+		"</body>\n"
+	"</html>\n";
+
+static void
+respond(WebKitURISchemeRequest *request, const gchar *uri, guchar *data,
+	gsize length)
+{
+	gchar        *escaped_data;
+	GInputStream *stream;
+
+	escaped_data = g_markup_escape_text((gchar *) data, length);
+
+	stream = g_memory_input_stream_new_from_data(
+		g_strdup_printf(document,
+			gtk_widget_get_default_direction() ==
+				GTK_TEXT_DIR_RTL ? "rtl" : "ltr",
+			uri, escaped_data), -1, g_free);
+
+	webkit_uri_scheme_request_finish(request, stream, -1, "text/html");
+	g_object_unref(stream);
+}
+
+static void
+data_cb(MqWebView *web_view, GParamSpec G_GNUC_UNUSED *param_spec,
+	DataSignalData *data_signal_data)
+{
+	guchar *data;
+	gsize   length;
+
+	data = mq_web_view_get_data(web_view, &length);
+	respond(data_signal_data->request, data_signal_data->uri, data, length);
+	g_signal_handler_disconnect(web_view, data_signal_data->handler_id);
+	g_free(data_signal_data->uri);
+	g_free(data_signal_data);
+}
+
+void
+mq_view_source_request(WebKitURISchemeRequest *request,
+	MqApplication *application)
+{
+	const gchar    *path;
+	gchar          *query_str;
+	GHashTable     *query;
+	gint64          origin_tab_id;
+	gchar          *uri;
+	MqTabPage      *origin_tab;
+	MqWebView      *origin_web_view;
+	guchar         *data;
+	gsize           length;
+	DataSignalData *data_signal_data;
+
+	path = webkit_uri_scheme_request_get_path(request);
+
+	if (g_str_has_prefix(path, "resources/")) {
+		mq_resource_response(application, path + sizeof("resources"),
+			request);
+		return;
+	}
+
+	query_str = g_strdup(path);
+	query = mq_parse_query_string(query_str);
+
+	/* TODO: Handle missing tab ID ("origin-tab=0"). */
+	origin_tab_id = mq_atoi64(g_hash_table_lookup(query, "origin-tab"));
+	uri = g_strdup(g_hash_table_lookup(query, "uri"));
+
+	g_hash_table_unref(query);
+	g_free(query_str);
+
+	origin_tab = mq_application_get_tab(application, origin_tab_id);
+
+	if (origin_tab) {
+		origin_web_view = mq_tab_page_get_web_view(origin_tab);
+
+		data = mq_web_view_get_data(origin_web_view, &length);
+		if (data) {
+			respond(request, uri, data, length);
+		} else {
+			data_signal_data = g_new(DataSignalData, 1);
+			data_signal_data->request = request;
+			data_signal_data->uri = uri;
+			data_signal_data->handler_id = g_signal_connect(
+				origin_web_view, "notify::data",
+				G_CALLBACK(data_cb), data_signal_data);
+		}
+	} else {
+		/* TODO: Handling reloads by newly requesting the resource
+		 * should obviate this. */
+		respond(request, uri,
+			(guchar *) g_strdup("Viewed tab no longer open"), -1);
+	}
+}
diff --git a/src/schemes/view-source.h b/src/schemes/view-source.h
new file mode 100644
index 0000000..1f948e5
--- /dev/null
+++ b/src/schemes/view-source.h
@@ -0,0 +1,34 @@
+/*
+ * view-source: URI scheme
+ *
+ * Copyright (C) 2017  Patrick McDermott
+ *
+ * This file is part of Marquee.
+ *
+ * Marquee 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.
+ *
+ * Marquee 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 Marquee.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef MQ_VIEW_SOURCE_H
+#define MQ_VIEW_SOURCE_H
+
+#include <glib.h>
+#include <webkit2/webkit2.h>
+
+#include "../application.h"
+
+void
+mq_view_source_request(WebKitURISchemeRequest *request,
+	MqApplication *application);
+
+#endif  /* MQ_VIEW_SOURCE_H */