55 lines
1.7 KiB
V
55 lines
1.7 KiB
V
module websocket
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import rand
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import crypto.sha1
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import encoding.base64
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// htonl64 converts payload length to header bits
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fn htonl64(payload_len u64) []byte {
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mut ret := []byte{len: 8}
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ret[0] = byte(((payload_len & (u64(0xff) << 56)) >> 56) & 0xff)
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ret[1] = byte(((payload_len & (u64(0xff) << 48)) >> 48) & 0xff)
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ret[2] = byte(((payload_len & (u64(0xff) << 40)) >> 40) & 0xff)
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ret[3] = byte(((payload_len & (u64(0xff) << 32)) >> 32) & 0xff)
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ret[4] = byte(((payload_len & (u64(0xff) << 24)) >> 24) & 0xff)
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ret[5] = byte(((payload_len & (u64(0xff) << 16)) >> 16) & 0xff)
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ret[6] = byte(((payload_len & (u64(0xff) << 8)) >> 8) & 0xff)
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ret[7] = byte(((payload_len & (u64(0xff) << 0)) >> 0) & 0xff)
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return ret
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}
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// create_masking_key returs a new masking key to use when masking websocket messages
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fn create_masking_key() []byte {
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mask_bit := rand.byte()
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buf := []byte{len: 4, init: `0`}
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unsafe { C.memcpy(buf.data, &mask_bit, 4) }
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return buf
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}
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// create_key_challenge_response creates a key challange response from security key
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fn create_key_challenge_response(seckey string) ?string {
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if seckey.len == 0 {
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return error('unexpected seckey lengt zero')
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}
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guid := '258EAFA5-E914-47DA-95CA-C5AB0DC85B11'
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sha1buf := seckey + guid
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shabytes := sha1buf.bytes()
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hash := sha1.sum(shabytes)
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b64 := base64.encode(hash)
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unsafe {
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hash.free()
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shabytes.free()
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}
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return b64
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}
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// get_nonce creates a randomized array used in handshake process
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fn get_nonce(nonce_size int) string {
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mut nonce := []byte{len: nonce_size, cap: nonce_size}
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alphanum := '0123456789ABCDEFGHIJKLMNOPQRSTUVXYZabcdefghijklmnopqrstuvwxyz'
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for i in 0 .. nonce_size {
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nonce[i] = alphanum[rand.intn(alphanum.len) or { 0 }]
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}
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return unsafe { tos(nonce.data, nonce.len) }.clone()
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}
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