Initial project import

tools/v/vlib/net/websocket/utils.v

@@ -0,0 +1,50 @@
+module websocket
+
+import rand
+import crypto.sha1
+import encoding.base64
+import encoding.binary
+import log
+
+const default_logger = setup_default_logger()
+
+fn setup_default_logger() &log.Log {
+	mut l := &log.Log{}
+	l.set_level(.info)
+	return l
+}
+
+// htonl64 converts payload length to header bits
+fn htonl64(payload_len u64) []u8 {
+	mut ret := []u8{len: 8}
+	binary.big_endian_put_u64(mut ret, payload_len)
+	return ret
+}
+
+// create_masking_key returns a new masking key to use when masking websocket messages
+fn create_masking_key() []u8 {
+	return rand.bytes(4) or { [u8(0), 0, 0, 0] }
+}
+
+// create_key_challenge_response creates a key challenge response from security key
+fn create_key_challenge_response(seckey string) !string {
+	if seckey.len == 0 {
+		return error('unexpected seckey length zero')
+	}
+	guid := '258EAFA5-E914-47DA-95CA-C5AB0DC85B11'
+	sha1buf := seckey + guid
+	shabytes := sha1buf.bytes()
+	hash := sha1.sum(shabytes)
+	b64 := base64.encode(hash)
+	unsafe {
+		hash.free()
+		shabytes.free()
+	}
+	return b64
+}
+
+// get_nonce creates a randomized array used in handshake process
+fn get_nonce(nonce_size int) string {
+	return rand.string_from_set('0123456789ABCDEFGHIJKLMNOPQRSTUVXYZabcdefghijklmnopqrstuvwxyz',
+		nonce_size)
+}