v/vlib/net/http/backend_nix.c.v

// Copyright (c) 2019-2020 Alexander Medvednikov. All rights reserved.
// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
module http

import strings
// On linux, prefer a localy build openssl, because it is
// much more likely for it to be newer, than the system
// openssl from libssl-dev. If there is no local openssl,
// the next flag is harmless, since it will still use the
// (older) system openssl.
#flag linux -I/usr/local/include/openssl -L/usr/local/lib
#flag -l ssl -l crypto
// MacPorts
#flag darwin -I/opt/local/include
#flag darwin -L/opt/local/lib
// Brew
#flag darwin -I/usr/local/opt/openssl/include
#flag darwin -L/usr/local/opt/openssl/lib
#include <openssl/ssl.h>
struct C.SSL {
}

fn C.SSL_library_init()


fn C.TLSv1_2_method() voidptr


fn C.SSL_CTX_set_options()


fn C.SSL_CTX_new() voidptr


fn C.SSL_CTX_set_verify_depth()


fn C.SSL_CTX_load_verify_locations() int


fn C.BIO_new_ssl_connect() voidptr


fn C.BIO_set_conn_hostname() int


fn C.BIO_get_ssl()


fn C.SSL_set_cipher_list() int


fn C.BIO_do_connect() int


fn C.BIO_do_handshake() int


fn C.SSL_get_peer_certificate() int


fn C.SSL_get_verify_result() int


fn C.SSL_set_tlsext_host_name() int


fn C.BIO_puts()


fn C.BIO_read() int


fn C.BIO_free_all()


fn C.SSL_CTX_free()


fn init() int {
	C.SSL_library_init()
	return 1
}

const (
buf_size = 500  // 1536
)

fn (req &Request) ssl_do(port int, method, host_name, path string) ?Response {
	// ssl_method := C.SSLv23_method()
	ssl_method := C.TLSv1_2_method()
	if isnil(method) {
	}
	ctx := C.SSL_CTX_new(ssl_method)
	if isnil(ctx) {
	}
	C.SSL_CTX_set_verify_depth(ctx, 4)
	flags := C.SSL_OP_NO_SSLv2 | C.SSL_OP_NO_SSLv3 | C.SSL_OP_NO_COMPRESSION
	C.SSL_CTX_set_options(ctx, flags)
	mut res := C.SSL_CTX_load_verify_locations(ctx, 'random-org-chain.pem', 0)
	if res != 1 {
	}
	web := C.BIO_new_ssl_connect(ctx)
	if isnil(ctx) {
	}
	addr := host_name + ':' + port.str()
	res = C.BIO_set_conn_hostname(web, addr.str)
	if res != 1 {
	}
	ssl := &C.SSL(0)
	C.BIO_get_ssl(web, &ssl)
	if isnil(ssl) {
	}
	preferred_ciphers := 'HIGH:!aNULL:!kRSA:!PSK:!SRP:!MD5:!RC4'
	res = C.SSL_set_cipher_list(ssl, preferred_ciphers.str)
	if res != 1 {
		println('http: openssl: cipher failed')
	}
	res = C.SSL_set_tlsext_host_name(ssl, host_name.str)
	res = C.BIO_do_connect(web)
	if res != 1 {
		return error('cannot connect the endpoint')
	}
	res = C.BIO_do_handshake(web)
	C.SSL_get_peer_certificate(ssl)
	res = C.SSL_get_verify_result(ssl)
	// /////
	req_headers := req.build_request_headers(method, host_name, path)
	C.BIO_puts(web, req_headers.str)
	mut headers := strings.new_builder(100)
	mut h := ''
	mut headers_done := false
	mut sb := strings.new_builder(100)
	mut buff := [buf_size]byte
	mut is_chunk_encoding := false
	for {
		len := C.BIO_read(web, buff, buf_size)
		if len <= 0 {
			break
		}
		mut chunk := (tos(buff, len))
		if !headers_done && chunk.contains('\r\n\r\n') {
			headers_done = true
			headers.write(chunk.all_before('\r\n'))
			h = headers.str()
			//println(h)
			sb.write(chunk.after('\r\n'))
			// TODO for some reason this can be missing from headers
			is_chunk_encoding = true //h.contains('chunked')
			//println(sb.str())
			continue
		}
		// TODO clean this up
		if is_chunk_encoding && len > 6 && ((buff[3] == 13 && buff[4] == 10) || (buff[2] ==13 && buff[3]==10)
		|| (buff[4] == 13 && buff[5] == 10) ) {
			chunk = chunk.after_char(10)
		}
		if chunk.len > 3 && chunk[chunk.len-2] == 13 && chunk[chunk.len-1] == 10 {
			chunk = chunk[..chunk.len-2]
		}
		if headers_done {
			sb.write(chunk)
		} else {
			headers.write(chunk)
		}
	}
	if !isnil(web) {
		C.BIO_free_all(web)
	}
	if !isnil(ctx) {
		C.SSL_CTX_free(ctx)
	}
	body:= sb.str()
	println(body)
	return parse_response(h +'\r\n\r\n'+ body)
}