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#ifdef HTTP_BACKEND_WINHTTP
#include "http.h"
#include <windows.h>
#include <winhttp.h>
#include <assert.h>
SQLITE_EXTENSION_INIT3
static char* unicode_to_utf8(LPCWSTR zWide) {
DWORD nSize;
char* zUtf8;
nSize = WideCharToMultiByte(CP_UTF8, 0, zWide, -1, NULL, 0, NULL, NULL);
if (nSize == 0) {
return NULL;
}
zUtf8 = sqlite3_malloc(nSize);
if (!zUtf8) {
return NULL;
}
nSize = WideCharToMultiByte(CP_UTF8, 0, zWide, -1, zUtf8, nSize, NULL, NULL);
if (nSize == 0) {
sqlite3_free(zUtf8);
return NULL;
}
return zUtf8;
}
static LPWSTR utf8_to_unicode(const char* zText) {
DWORD nSize;
LPWSTR zWide;
nSize = MultiByteToWideChar(CP_UTF8, 0, zText, -1, NULL, 0);
if (nSize == 0) {
return NULL;
}
zWide = sqlite3_malloc(sizeof(*zWide) * nSize);
if (!zWide) {
return NULL;
}
nSize = MultiByteToWideChar(CP_UTF8, 0, zText, -1, zWide, nSize);
if (nSize == 0) {
sqlite3_free(zWide);
return NULL;
}
return zWide;
}
static char* win32_get_last_error(DWORD code) {
LPWSTR zWide = NULL;
FormatMessageW(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
code,
0,
(LPWSTR)&zWide,
0,
NULL);
char* zUtf8 = unicode_to_utf8(zWide);
LocalFree(zWide);
return zUtf8;
}
static int query_headers(HINTERNET request, DWORD dwInfoLevel, char** ppResult) {
DWORD szWide = 0;
LPWSTR zWide = NULL;
WinHttpQueryHeaders(
request, dwInfoLevel, WINHTTP_HEADER_NAME_BY_INDEX, NULL, &szWide, WINHTTP_NO_HEADER_INDEX);
if (GetLastError() != ERROR_INSUFFICIENT_BUFFER) {
return SQLITE_ERROR;
}
zWide = sqlite3_malloc(szWide);
if (!zWide) {
return SQLITE_NOMEM;
}
if (!WinHttpQueryHeaders(request,
dwInfoLevel,
WINHTTP_HEADER_NAME_BY_INDEX,
zWide,
&szWide,
WINHTTP_NO_HEADER_INDEX)) {
sqlite3_free(zWide);
return SQLITE_ERROR;
}
*ppResult = unicode_to_utf8(zWide);
sqlite3_free(zWide);
return SQLITE_OK;
}
int http_do_request(http_request* req, http_response* resp, char** ppErrMsg) {
LPWSTR zUrlWide = NULL;
LPWSTR zHostWide = NULL;
LPWSTR zMethodWide = NULL;
LPWSTR zHeadersWide = NULL;
HINTERNET session = NULL;
HINTERNET conn = NULL;
HINTERNET request = NULL;
URL_COMPONENTS components;
DWORD lastErr = 0;
const char* errFunc = NULL;
char* zErrMsg = NULL;
int rc = SQLITE_ERROR;
LPWSTR zWideResponseHeaders = NULL;
DWORD szWideResponseHeaders = 0;
DWORD dwSize = 0;
DWORD dwStatusCode;
zUrlWide = utf8_to_unicode(req->zUrl);
if (!zUrlWide) {
rc = SQLITE_NOMEM;
goto error;
}
memset(&components, 0, sizeof(components));
components.dwStructSize = sizeof(components);
components.dwHostNameLength = 1;
components.dwUrlPathLength = 1;
if (!WinHttpCrackUrl(zUrlWide, 0, 0, &components)) {
lastErr = GetLastError();
errFunc = "WinHttpCrackUrl";
goto error;
}
session = WinHttpOpen(L"sqlite3-http",
WINHTTP_ACCESS_TYPE_AUTOMATIC_PROXY,
WINHTTP_NO_PROXY_NAME,
WINHTTP_NO_PROXY_BYPASS,
0);
if (!session) {
lastErr = GetLastError();
errFunc = "WinHttpCrackOpen";
goto error;
}
// WinHttpSetStatusCallback(session,
// (WINHTTP_STATUS_CALLBACK)statusCallback,
// WINHTTP_CALLBACK_FLAG_ALL_NOTIFICATIONS,
// 0);
zHostWide = sqlite3_malloc(sizeof(wchar_t) * (components.dwHostNameLength + 1));
if (!zHostWide) {
rc = SQLITE_NOMEM;
goto error;
}
memcpy(zHostWide, components.lpszHostName, sizeof(wchar_t) * components.dwHostNameLength);
zHostWide[components.dwHostNameLength] = L'\0';
conn = WinHttpConnect(session, zHostWide, components.nPort, 0);
if (!conn) {
lastErr = GetLastError();
errFunc = "WinHttpConnect";
goto error;
}
zMethodWide = utf8_to_unicode(req->zMethod);
if (!zMethodWide) {
rc = SQLITE_NOMEM;
goto error;
}
request = WinHttpOpenRequest(conn,
zMethodWide,
components.lpszUrlPath,
NULL,
WINHTTP_NO_REFERER,
WINHTTP_DEFAULT_ACCEPT_TYPES,
components.nPort == 443 ? WINHTTP_FLAG_SECURE : 0);
if (!request) {
lastErr = GetLastError();
errFunc = "WinHttpOpenRequest";
goto error;
}
if (req->zHeaders) {
zHeadersWide = utf8_to_unicode(req->zHeaders);
}
if (!WinHttpSendRequest(request,
zHeadersWide,
zHeadersWide ? -1 : 0,
(void*)req->pBody,
req->szBody,
req->szBody,
0)) {
lastErr = GetLastError();
errFunc = "WinHttpSendRequest";
goto error;
}
if (!WinHttpReceiveResponse(request, NULL)) {
lastErr = GetLastError();
errFunc = "WinHttpReceiveResponse";
goto error;
}
assert(resp->pBody == NULL);
assert(resp->szBody == 0);
for (;;) {
DWORD dwSize = 0;
DWORD nRead = 0;
char* nb;
if (!WinHttpQueryDataAvailable(request, &dwSize)) {
lastErr = GetLastError();
errFunc = "WinHttpQueryDataAvailable";
goto error;
}
if (dwSize == 0) {
break;
}
nb = sqlite3_realloc(resp->pBody, resp->szBody + dwSize);
if (!nb) {
rc = SQLITE_NOMEM;
goto error;
}
resp->pBody = nb;
if (!WinHttpReadData(request, (char*)resp->pBody + resp->szBody, dwSize, &nRead)) {
lastErr = GetLastError();
errFunc = "WinHttpReadData";
goto error;
}
resp->szBody += dwSize;
if (nRead == 0) {
break;
}
}
rc = query_headers(request, WINHTTP_QUERY_RAW_HEADERS_CRLF, &resp->zHeaders);
if (rc != SQLITE_OK) {
if (rc == SQLITE_ERROR) {
lastErr = GetLastError();
errFunc = "WinHttpQueryHeaders(WINHTTP_QUERY_RAW_HEADERS_CRLF)";
}
goto error;
}
rc = SQLITE_ERROR; // need to reset this back. Otherwise a jump to error below
// could leave rc as SQLITE_OK...
dwSize = sizeof(dwStatusCode);
if (!WinHttpQueryHeaders(request,
WINHTTP_QUERY_STATUS_CODE | WINHTTP_QUERY_FLAG_NUMBER,
WINHTTP_HEADER_NAME_BY_INDEX,
&dwStatusCode,
&dwSize,
WINHTTP_NO_HEADER_INDEX)) {
lastErr = GetLastError();
errFunc = "WinHttpQueryHeaders(WINHTTP_QUERY_STATUS_CODE)";
goto error;
}
resp->iStatusCode = dwStatusCode;
remove_all_but_last_headers(resp->zHeaders);
separate_status_and_headers(&resp->zStatus, resp->zHeaders);
rc = SQLITE_OK;
goto done;
error:
if (rc == SQLITE_ERROR && errFunc) {
*ppErrMsg = win32_get_last_error(lastErr);
}
done:
sqlite3_free(zUrlWide);
sqlite3_free(zHostWide);
sqlite3_free(zMethodWide);
sqlite3_free(zHeadersWide);
WinHttpCloseHandle(request);
WinHttpCloseHandle(conn);
WinHttpCloseHandle(session);
return rc;
}
#endif // HTTP_BACKEND_WINHTTP
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