1 files changed, 36 insertions, 0 deletions
diff --git a/util/net.hh b/util/net.hh
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+++ b/util/net.hh
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+/*
+ * net.hh - Miscellaneous networking routines
+ * util, the utility library for
+ * Project Horizon
+ *
+ * Copyright (c) 2019 Adélie Linux and contributors.  All rights reserved.
+ * This code is licensed under the AGPL 3.0 license, as noted in the
+ * LICENSE-code file in the root directory of this repository.
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+#ifndef __HORIZON_NET_HH_
+#define __HORIZON_NET_HH_
+
+#include <algorithm>
+#include <string>
+
+/*! Determine if a string starts with a valid, supported protocol
+ * @param url       The URL.
+ * @returns true if +url+ is a URL for a supported protocol, false otherwise.
+ */
+static bool is_valid_url(const std::string &url) {
+    std::string::size_type colon = url.find("://");
+    /* If there's no ://, it's definitely not a URL */
+    if(colon == std::string::npos) return false;
+    std::string proto = url.substr(0, colon);
+    std::transform(proto.cbegin(), proto.cend(), proto.begin(), ::tolower);
+    if(proto == "http" || proto == "https" || proto == "tftp" || proto == "smb"
+            || proto == "cifs") {
+        return true;
+    }
+    return false;
+}
+
+#endif /* !__HORIZON_NET_HH */