LibGUI: Add GUI::DesktopServices::open(URL)

This API is used to open a URL in whatever way the desktop system feels
is best. If you give it a file:// URL, it will try to work out a good
application to open the URL with. For all other protocols, it will open
a Browser instance. :^)

Libraries/LibGUI/DesktopServices.cpp

@@ -0,0 +1,83 @@
+/*
+ * Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <AK/URL.h>
+#include <LibGUI/DesktopServices.h>
+#include <stdio.h>
+#include <sys/stat.h>
+
+namespace GUI {
+
+static bool open_file_url(const URL&);
+static bool spawn(String executable, String argument);
+
+bool DesktopServices::open(const URL& url)
+{
+    if (url.protocol() == "file")
+        return open_file_url(url);
+
+    return spawn("/bin/Browser", url.to_string());
+}
+
+bool spawn(String executable, String argument)
+{
+    if (fork() == 0) {
+        if (execl(executable.characters(), executable.characters(), argument.characters(), nullptr) < 0) {
+            perror("execl");
+            return false;
+        }
+        ASSERT_NOT_REACHED();
+    }
+    return true;
+}
+
+bool open_file_url(const URL& url)
+{
+    struct stat st;
+    if (stat(url.path().characters(), &st) < 0) {
+        perror("stat");
+        return false;
+    }
+
+    if (S_ISDIR(st.st_mode))
+        return spawn("/bin/FileManager", url.path());
+
+    if (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))
+        return spawn(url.path(), {});
+
+    if (url.path().to_lowercase().ends_with(".png"))
+        return spawn("/bin/QuickShow", url.path());
+
+    if (url.path().to_lowercase().ends_with(".html"))
+        return spawn("/bin/Browser", url.path());
+
+    if (url.path().to_lowercase().ends_with(".wav"))
+        return spawn("/bin/SoundPlayer", url.path());
+
+    return spawn("/bin/TextEditor", url.path());
+}
+
+}

Libraries/LibGUI/DesktopServices.h

@@ -0,0 +1,38 @@
+/*
+ * Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <AK/Forward.h>
+
+namespace GUI {
+
+class DesktopServices {
+public:
+    static bool open(const URL&);
+};
+
+}

Libraries/LibGUI/Makefile

@@ -18,6 +18,7 @@ OBJS = \
     CppLexer.o \
     CppSyntaxHighlighter.o \
     Desktop.o \
+    DesktopServices.o \
     Dialog.o \
     DisplayLink.o \
     DragOperation.o \