util-lib: move web-related calls into web-util.[ch]

src/basic/web-util.c

@@ -0,0 +1,78 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  This file is part of systemd.
+
+  Copyright 2010 Lennart Poettering
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd 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
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <stdbool.h>
+
+#include "string-util.h"
+#include "utf8.h"
+#include "web-util.h"
+
+bool http_etag_is_valid(const char *etag) {
+        if (isempty(etag))
+                return false;
+
+        if (!endswith(etag, "\""))
+                return false;
+
+        if (!startswith(etag, "\"") && !startswith(etag, "W/\""))
+                return false;
+
+        return true;
+}
+
+bool http_url_is_valid(const char *url) {
+        const char *p;
+
+        if (isempty(url))
+                return false;
+
+        p = startswith(url, "http://");
+        if (!p)
+                p = startswith(url, "https://");
+        if (!p)
+                return false;
+
+        if (isempty(p))
+                return false;
+
+        return ascii_is_valid(p);
+}
+
+bool documentation_url_is_valid(const char *url) {
+        const char *p;
+
+        if (isempty(url))
+                return false;
+
+        if (http_url_is_valid(url))
+                return true;
+
+        p = startswith(url, "file:/");
+        if (!p)
+                p = startswith(url, "info:");
+        if (!p)
+                p = startswith(url, "man:");
+
+        if (isempty(p))
+                return false;
+
+        return ascii_is_valid(p);
+}