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/* SPDX-License-Identifier: MIT
*
* Copyright (C) 2019 WireGuard LLC. All Rights Reserved.
*/
package winhttp
import (
"fmt"
"io"
"strconv"
"strings"
"syscall"
"unsafe"
"golang.org/x/sys/windows"
)
type Response struct {
session _HINTERNET
connection _HINTERNET
request _HINTERNET
}
func convertError(err *error) {
if *err == nil {
return
}
if se, ok := (*err).(syscall.Errno); ok {
if se > _WINHTTP_ERROR_BASE && se <= _WINHTTP_ERROR_LAST {
*err = Error(se)
}
}
}
func Get(userAgent string, url string) (response *Response, err error) {
response = new(Response)
defer convertError(&err)
defer func() {
if err != nil {
response.Close()
response = nil
}
}()
userAgent16, err := windows.UTF16PtrFromString(userAgent)
if err != nil {
return
}
url16, err := windows.UTF16PtrFromString(url)
if err != nil {
return
}
components := _URL_COMPONENTS{
structSize: uint32(unsafe.Sizeof(_URL_COMPONENTS{})),
hostName: &make([]uint16, 512)[0],
hostNameLength: 512,
urlPath: &make([]uint16, 512)[0],
urlPathLength: 512,
}
err = winHttpCrackUrl(url16, 0, _ICU_REJECT_USERPWD, &components)
if err != nil {
return
}
if components.schemeType != _INTERNET_SCHEME_HTTP && components.schemeType != _INTERNET_SCHEME_HTTPS {
err = _ERROR_WINHTTP_INVALID_URL
return
}
response.session, err = winHttpOpen(userAgent16, _WINHTTP_ACCESS_TYPE_NO_PROXY, nil, nil, 0)
if err != nil {
return
}
response.connection, err = winHttpConnect(response.session, components.hostName, components.port, 0)
if err != nil {
return
}
flags := uint32(_WINHTTP_FLAG_REFRESH)
if components.schemeType == _INTERNET_SCHEME_HTTPS {
flags |= _WINHTTP_FLAG_SECURE
}
response.request, err = winHttpOpenRequest(response.connection, windows.StringToUTF16Ptr("GET"), components.urlPath, nil, nil, nil, flags)
if err != nil {
return
}
err = winHttpSendRequest(response.request, nil, 0, nil, 0, 0, 0)
if err != nil {
return
}
err = winHttpReceiveResponse(response.request, 0)
if err != nil {
return
}
return
}
func (response *Response) Length() (length uint64, err error) {
defer convertError(&err)
numBuf := make([]uint16, 22)
numLen := uint32(len(numBuf) * 2)
err = winHttpQueryHeaders(response.request, _WINHTTP_QUERY_CONTENT_LENGTH, nil, unsafe.Pointer(&numBuf[0]), &numLen, nil)
if err != nil {
return
}
length, err = strconv.ParseUint(windows.UTF16ToString(numBuf[:numLen]), 10, 64)
if err != nil {
return
}
return
}
func (response *Response) Read(p []byte) (n int, err error) {
defer convertError(&err)
if len(p) == 0 {
return 0, nil
}
var bytesRead uint32
err = winHttpReadData(response.request, &p[0], uint32(len(p)), &bytesRead)
if err != nil {
return 0, nil
}
if bytesRead == 0 || int(bytesRead) < 0 {
return 0, io.EOF
}
return int(bytesRead), nil
}
func (response *Response) Close() (err error) {
defer convertError(&err)
var err1, err2, err3 error
if response.request != 0 {
err1 = winHttpCloseHandle(response.request)
}
if response.connection != 0 {
err2 = winHttpCloseHandle(response.connection)
}
if response.session != 0 {
err3 = winHttpCloseHandle(response.session)
}
switch {
case err1 != nil:
return err1
case err2 != nil:
return err2
case err3 != nil:
return err3
}
return nil
}
func (error Error) Error() string {
var message [2048]uint16
n, err := windows.FormatMessage(windows.FORMAT_MESSAGE_FROM_HMODULE|windows.FORMAT_MESSAGE_IGNORE_INSERTS|windows.FORMAT_MESSAGE_MAX_WIDTH_MASK,
modwinhttp.Handle(), uint32(error), 0, message[:], nil)
if err != nil {
return fmt.Sprintf("WinHTTP error #%d", error)
}
return strings.TrimSpace(windows.UTF16ToString(message[:n]))
}
|
