annotate ui/downloader_win.cpp @ 249:6a7eb102716d

Remove code duplication by unifying the certificatelist. You should now check for isInstallCert to determine wether this certificate should be installed or removed. Leaving the getInstallCertificates and getRemoveCertificates in place for compatibilty would have been easier to keep the tests stable.
author Andre Heinecke <aheinecke@intevation.de>
date Mon, 31 Mar 2014 08:06:17 +0000
parents 62cd56cea09b
children 17e1c8f37d72
rev   line source
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1 /**
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2 * @file downloader_win.cpp
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3 * @brief Downloader implementation for Windows
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4 *
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5 * We use Windows API here instead of Qt because we want to avoid
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6 * QtNetworks SSL stack which is based on OpenSSL and so
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7 * we might be incompatible with GPL code. Also using the
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8 * native API means that the security of the SSL implementation
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9 * is tied to the security of the system.
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10 *
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11 */
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12 #include "downloader.h"
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13 #ifdef Q_OS_WIN
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14 #ifndef MYVERSION
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15 #define MYVERSION "1"
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16 #endif
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17
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18 #include <windows.h>
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19 #include <winhttp.h>
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20
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21 #include <QDebug>
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22 #include <QDateTime>
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23 #include <QSaveFile>
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24 #include <QFileInfo>
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25
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26 #define DEBUG if (1) qDebug() << __PRETTY_FUNCTION__
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27
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28 #define MAX_SW_SIZE 10485760
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29 #define MAX_LIST_SIZE 1048576
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30 /** @brief Download a file from the Internet
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31 *
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32 * @param[in] HSession the session to work in.
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33 * @param[in] HConnect the connection to use.
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34 * @param[in] resource the resource to download.
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35 * @param[in] filename where the file should be saved.
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36 * @param[in] maxSize maximum amount of bytes to download
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37 *
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38 * @returns True if the download was successful.
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39 */
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40 bool downloadFile(HINTERNET hSession, HINTERNET hConnect,
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41 LPCWSTR resource, const QString &filename, DWORD maxSize);
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42
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43 /** @brief get the last modified header of a resource.
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44 *
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45 * On error call getLastError to get extended error information.
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46 * This function still does not do any networking but only initializes
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47 * it.
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48 *
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49 * @param[in] HSession the session to work in.
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50 * @param[in] HConnect the connection to use.
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51 * @param[in] resource the resource to check the last-modified date on
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52 *
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53 * @returns the last modified date or a null datetime in case of errors
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54 */
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55 QDateTime getLastModifiedHeader(HINTERNET hSession,
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56 HINTERNET hConnect, LPCWSTR resource);
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57
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58 /** @brief verify that the certificate of the request matches
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59 *
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60 * Validates the certificate against the member variable certificate
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61 *
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62 * @param[in] hRequest: The request from which to get the certificate
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63 *
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64 * @returns True if the certificate exactly matches the one in hRequest
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65 */
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66
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67 bool verifyCertificate(HINTERNET hRequest);
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68
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69
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70 #define LIST_RESOURCE "/incoming/aheinecke/test"
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71 #define SW_RESOURCE "/incoming/aheinecke/test"
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72
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73 /** @brief A wrapper around a HINTERNET structure that handles closing
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74 *
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75 * Holds a HINTERNET structure and closes it if necessary on destruction.
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76 *
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77 */
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78 class SmartHINTERNET {
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79 public:
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80 SmartHINTERNET() : handle(NULL) {}
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81
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82 ~SmartHINTERNET() {
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83 if (handle) {
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84 WinHttpCloseHandle(handle);
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85 }
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86 }
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87
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88 HINTERNET handle;
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89 };
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90
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91 /** @brief Qt wrapper around FormatMessage
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92 *
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93 * @returns The error message of the error that occurred
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94 */
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95 const QString getLastErrorMsg() {
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96 LPWSTR bufPtr = NULL;
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97 DWORD err = GetLastError();
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98 FormatMessageW(FORMAT_MESSAGE_ALLOCATE_BUFFER |
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99 FORMAT_MESSAGE_FROM_SYSTEM |
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100 FORMAT_MESSAGE_IGNORE_INSERTS,
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101 NULL, err, 0, (LPWSTR)&bufPtr, 0, NULL);
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102 if (!bufPtr) {
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103 HMODULE hWinhttp = GetModuleHandleW(L"winhttp");
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104 if (hWinhttp) {
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105 FormatMessageW(FORMAT_MESSAGE_ALLOCATE_BUFFER |
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106 FORMAT_MESSAGE_FROM_HMODULE |
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107 FORMAT_MESSAGE_IGNORE_INSERTS,
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108 hWinhttp, HRESULT_CODE(err), 0,
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109 (LPWSTR)&bufPtr, 0, NULL);
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110 }
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111 }
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112 const QString result =
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113 (bufPtr) ? QString::fromUtf16((const ushort*)bufPtr).trimmed() :
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114 QString("Unknown Error %1").arg(err);
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115 LocalFree(bufPtr);
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116 return result;
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117 }
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118
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119
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120 /** @brief open a session with appropriate proxy settings
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121 *
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122 * @param[inout] *pHSession pointer to a HInternet structure
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123 *
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124 * On error call getLastError to get extended error information.
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125 *
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126 * @returns True on success, false on error.
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127 */
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128
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129
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130 bool openSession(HINTERNET *pHSession)
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131 {
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132 WINHTTP_CURRENT_USER_IE_PROXY_CONFIG proxyConfig;
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133
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134 DEBUG;
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135 if (!pHSession) {
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136 SetLastError(ERROR_INVALID_PARAMETER);
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137 return false;
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138 }
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139
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140 memset(&proxyConfig, 0, sizeof (WINHTTP_CURRENT_USER_IE_PROXY_CONFIG));
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141
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142 if (WinHttpGetIEProxyConfigForCurrentUser(&proxyConfig)) {
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143 if (proxyConfig.fAutoDetect) {
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144 // TODO Handle this
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145 qDebug() << "Autodetect is set";
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146 }
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147
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148 if (proxyConfig.lpszProxy || proxyConfig.lpszProxyBypass) {
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149 DEBUG << "Using proxies.";
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150 }
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151
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152 if (proxyConfig.lpszProxy) {
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153 *pHSession = WinHttpOpen(L"M13 "MYVERSION,
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154 WINHTTP_ACCESS_TYPE_NAMED_PROXY,
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155 proxyConfig.lpszProxy,
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156 proxyConfig.lpszProxyBypass, 0);
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157 }
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158 }
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159
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160 if (!*pHSession) {
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161 DEBUG << "No IE Proxy falling back to default proxy";
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162 *pHSession = WinHttpOpen(L"M13 "MYVERSION,
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163 WINHTTP_ACCESS_TYPE_DEFAULT_PROXY,
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164 WINHTTP_NO_PROXY_NAME,
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165 WINHTTP_NO_PROXY_BYPASS, 0);
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166 }
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167 // Cleanup
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168 if (proxyConfig.lpszAutoConfigUrl) {
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169 GlobalFree(proxyConfig.lpszAutoConfigUrl);
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170 }
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171
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172 if (proxyConfig.lpszProxy) {
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173 GlobalFree(proxyConfig.lpszProxy);
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174 }
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175
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176 if (proxyConfig.lpszProxyBypass) {
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177 GlobalFree(proxyConfig.lpszProxyBypass);
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178 }
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179 return *pHSession;
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180 }
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181
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182
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183 /** @brief initialize a connection in the session
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184 *
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185 * @param[in] HSession the session to work in.
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186 * @param[inout] *pHConnect pointer to the connection.
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187 * @param[in] url pointer to the URL in wchar representation.
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188 *
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189 * On error call getLastError to get extended error information.
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190 *
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191 * @returns True on success, false on error.
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192 */
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193 bool initializeConnection(HINTERNET hSession, HINTERNET *pHConnect,
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194 LPCWSTR url)
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195 {
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196 DEBUG;
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197 if (!hSession || !pHConnect) {
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198 SetLastError(ERROR_INVALID_PARAMETER);
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199 return false;
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200 }
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201 // Initialize connection. No request is done here.
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202 *pHConnect = WinHttpConnect(hSession, url,
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203 INTERNET_DEFAULT_HTTPS_PORT, 0);
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204
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205 return *pHConnect;
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206 }
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207
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208 /** @brief Create a request
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209 *
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210 * @param[in] HSession the session to work in.
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211 * @param[in] HConnect the connection to use.
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212 * @param[inout] *pHRequest pointer to the request structure to be filled.
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213 * @param[in] requestType the HTTP request to be made default is GET
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214 * @param[in] resource pointer to the resource to request in wchar
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215 * representation.
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216 *
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217 * On error call getLastError to get extended error information.
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218 * This function still does not do any networking but only initializes
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219 * it.
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220 *
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221 * @returns True on success, false on error.
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222 */
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223
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224 bool createRequest(HINTERNET hSession, HINTERNET hConnect,
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225 HINTERNET *pHRequest, LPCWSTR requestType, LPCWSTR resource)
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226 {
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227 DWORD dwSSLFlag;
11
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228 DEBUG;
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229 if (!hSession || !hConnect || !pHRequest) {
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230 SetLastError(ERROR_INVALID_PARAMETER);
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231 return false;
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232 }
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233
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234 *pHRequest = WinHttpOpenRequest(hConnect, requestType, resource,
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235 NULL, WINHTTP_NO_REFERER,
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236 WINHTTP_DEFAULT_ACCEPT_TYPES,
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237 WINHTTP_FLAG_SECURE);
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238
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239 dwSSLFlag = SECURITY_FLAG_IGNORE_UNKNOWN_CA;
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240 dwSSLFlag |= SECURITY_FLAG_IGNORE_CERT_DATE_INVALID;
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241 dwSSLFlag |= SECURITY_FLAG_IGNORE_CERT_CN_INVALID;
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242 dwSSLFlag |= SECURITY_FLAG_IGNORE_CERT_WRONG_USAGE;
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243
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244 WinHttpSetOption(*pHRequest, WINHTTP_OPTION_SECURITY_FLAGS,
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245 &dwSSLFlag, sizeof(dwSSLFlag));
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246
11
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247 return *pHRequest;
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248 }
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249
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250 bool Downloader::verifyCertificate(HINTERNET hRequest)
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251 {
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252 CERT_CONTEXT *certContext = NULL;
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253 DWORD certContextLen = sizeof(CERT_CONTEXT);
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254 bool retval = false;
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255
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256 if (!WinHttpQueryOption(hRequest,
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257 WINHTTP_OPTION_SERVER_CERT_CONTEXT,
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258 &certContext,
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259 &certContextLen)) {
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260 DEBUG << "Unable to get server certificate";
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261 return false;
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262 }
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263
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264 QByteArray serverCert ((const char *) certContext->pbCertEncoded,
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265 certContext->cbCertEncoded);
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266
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267 retval = (serverCert == mCert);
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268
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269 if (!retval) {
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270 DEBUG << "Certificate is not the same as the pinned one!"
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271 << "Base64 cert: " << serverCert.toBase64();
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272 emit error("Invalid certificate", InvalidCertificate);
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273 }
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274
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275 CertFreeCertificateContext(certContext);
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276 return retval;
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277 }
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278
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279 QDateTime Downloader::getLastModifiedHeader(HINTERNET hSession,
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diff changeset
280 HINTERNET hConnect, LPCWSTR resource)
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281 {
23
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282 SmartHINTERNET sHRequest;
15
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283 SYSTEMTIME lMod;
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284 DWORD sizeOfSystemtime = sizeof (SYSTEMTIME);
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285 QDateTime retval;
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diff changeset
286
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287 memset(&lMod, 0, sizeof (SYSTEMTIME));
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288
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289 if (!hSession || !hConnect || !resource) {
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290 SetLastError(ERROR_INVALID_PARAMETER);
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291 return retval;
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292 }
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293
23
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294 if (!createRequest(hSession, hConnect, &sHRequest.handle, L"HEAD",
15
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diff changeset
295 resource)) {
23
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296 return retval;
11
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297 }
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298
23
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diff changeset
299 if (!WinHttpSendRequest(sHRequest.handle,
15
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diff changeset
300 WINHTTP_NO_ADDITIONAL_HEADERS,
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301 0, WINHTTP_NO_REQUEST_DATA, 0,
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diff changeset
302 0, 0)) {
23
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diff changeset
303 return retval;
11
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304 }
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parents:
diff changeset
305
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diff changeset
306
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7d07d261b003 Wrap HINTERNET handles in a class to take advantage of scoping
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307 if (!WinHttpReceiveResponse(sHRequest.handle, NULL)) {
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308 return retval;
11
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309 }
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310
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diff changeset
311 if (!verifyCertificate(sHRequest.handle)) {
15
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312 DEBUG << "Certificate verification failed";
23
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313 return retval;
11
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314 }
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315
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316 if (!(WinHttpQueryHeaders(sHRequest.handle,
15
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diff changeset
317 WINHTTP_QUERY_LAST_MODIFIED |
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diff changeset
318 WINHTTP_QUERY_FLAG_SYSTEMTIME,
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319 NULL,
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320 &lMod,
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321 &sizeOfSystemtime,
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diff changeset
322 WINHTTP_NO_HEADER_INDEX))) {
23
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323 return retval;
15
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324 }
11
7e2f14c7aba2 Split up downloader component and further implement it
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325
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diff changeset
326 retval = QDateTime(QDate(lMod.wYear, lMod.wMonth, lMod.wDay),
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diff changeset
327 QTime(lMod.wHour, lMod.wMinute, lMod.wSecond,
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diff changeset
328 lMod.wMilliseconds),
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diff changeset
329 Qt::UTC);
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330 return retval;
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331 }
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diff changeset
332
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diff changeset
333 bool Downloader::downloadFile(HINTERNET hSession, HINTERNET hConnect,
17
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334 LPCWSTR resource, const QString &fileName, DWORD maxSize)
15
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diff changeset
335 {
23
7d07d261b003 Wrap HINTERNET handles in a class to take advantage of scoping
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diff changeset
336 SmartHINTERNET sHRequest;
15
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diff changeset
337 bool retval = false;
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338 DWORD bytesAvailable = 0,
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339 bytesRead = 0,
17
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diff changeset
340 totalDownloaded = 0,
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341 contentLength = 0,
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342 sizeOfDWORD = sizeof (DWORD);
15
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diff changeset
343
17
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diff changeset
344 QSaveFile outputFile(fileName);
15
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diff changeset
345
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346 if (!hSession || !hConnect || !resource) {
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diff changeset
347 SetLastError(ERROR_INVALID_PARAMETER);
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348 return retval;
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diff changeset
349 }
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diff changeset
350
23
7d07d261b003 Wrap HINTERNET handles in a class to take advantage of scoping
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diff changeset
351 if (!createRequest(hSession, hConnect, &sHRequest.handle, L"GET",
15
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diff changeset
352 resource)) {
23
7d07d261b003 Wrap HINTERNET handles in a class to take advantage of scoping
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diff changeset
353 return retval;
15
95e1b6edf2fc Implement more downloader functionality for Windows
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diff changeset
354 }
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diff changeset
355
23
7d07d261b003 Wrap HINTERNET handles in a class to take advantage of scoping
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diff changeset
356 if (!WinHttpSendRequest(sHRequest.handle,
15
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diff changeset
357 WINHTTP_NO_ADDITIONAL_HEADERS,
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diff changeset
358 0, WINHTTP_NO_REQUEST_DATA, 0,
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Andre Heinecke <aheinecke@intevation.de>
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diff changeset
359 0, 0)) {
23
7d07d261b003 Wrap HINTERNET handles in a class to take advantage of scoping
Andre Heinecke <aheinecke@intevation.de>
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diff changeset
360 return retval;
15
95e1b6edf2fc Implement more downloader functionality for Windows
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diff changeset
361 }
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Andre Heinecke <aheinecke@intevation.de>
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diff changeset
362
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
363
23
7d07d261b003 Wrap HINTERNET handles in a class to take advantage of scoping
Andre Heinecke <aheinecke@intevation.de>
parents: 20
diff changeset
364 if (!WinHttpReceiveResponse(sHRequest.handle, NULL)) {
7d07d261b003 Wrap HINTERNET handles in a class to take advantage of scoping
Andre Heinecke <aheinecke@intevation.de>
parents: 20
diff changeset
365 return retval;
15
95e1b6edf2fc Implement more downloader functionality for Windows
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diff changeset
366 }
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diff changeset
367
23
7d07d261b003 Wrap HINTERNET handles in a class to take advantage of scoping
Andre Heinecke <aheinecke@intevation.de>
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diff changeset
368 if (!verifyCertificate(sHRequest.handle)) {
15
95e1b6edf2fc Implement more downloader functionality for Windows
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diff changeset
369 DEBUG << "Certificate verification failed";
23
7d07d261b003 Wrap HINTERNET handles in a class to take advantage of scoping
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diff changeset
370 return retval;
15
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diff changeset
371 }
95e1b6edf2fc Implement more downloader functionality for Windows
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diff changeset
372
17
c12825a651ed Read out content-length and use this to skip existing files
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parents: 15
diff changeset
373
23
7d07d261b003 Wrap HINTERNET handles in a class to take advantage of scoping
Andre Heinecke <aheinecke@intevation.de>
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diff changeset
374 if (!(WinHttpQueryHeaders(sHRequest.handle,
17
c12825a651ed Read out content-length and use this to skip existing files
Andre Heinecke <aheinecke@intevation.de>
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diff changeset
375 WINHTTP_QUERY_CONTENT_LENGTH |
c12825a651ed Read out content-length and use this to skip existing files
Andre Heinecke <aheinecke@intevation.de>
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diff changeset
376 WINHTTP_QUERY_FLAG_NUMBER,
c12825a651ed Read out content-length and use this to skip existing files
Andre Heinecke <aheinecke@intevation.de>
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diff changeset
377 NULL,
c12825a651ed Read out content-length and use this to skip existing files
Andre Heinecke <aheinecke@intevation.de>
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diff changeset
378 &contentLength,
c12825a651ed Read out content-length and use this to skip existing files
Andre Heinecke <aheinecke@intevation.de>
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diff changeset
379 &sizeOfDWORD,
c12825a651ed Read out content-length and use this to skip existing files
Andre Heinecke <aheinecke@intevation.de>
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diff changeset
380 WINHTTP_NO_HEADER_INDEX))) {
c12825a651ed Read out content-length and use this to skip existing files
Andre Heinecke <aheinecke@intevation.de>
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diff changeset
381 // Continue anyway as we later really check how
c12825a651ed Read out content-length and use this to skip existing files
Andre Heinecke <aheinecke@intevation.de>
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diff changeset
382 // much we download.
c12825a651ed Read out content-length and use this to skip existing files
Andre Heinecke <aheinecke@intevation.de>
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diff changeset
383 DEBUG << "No content-length";
c12825a651ed Read out content-length and use this to skip existing files
Andre Heinecke <aheinecke@intevation.de>
parents: 15
diff changeset
384 }
c12825a651ed Read out content-length and use this to skip existing files
Andre Heinecke <aheinecke@intevation.de>
parents: 15
diff changeset
385
c12825a651ed Read out content-length and use this to skip existing files
Andre Heinecke <aheinecke@intevation.de>
parents: 15
diff changeset
386 if (contentLength > maxSize) {
23
7d07d261b003 Wrap HINTERNET handles in a class to take advantage of scoping
Andre Heinecke <aheinecke@intevation.de>
parents: 20
diff changeset
387 return retval;
17
c12825a651ed Read out content-length and use this to skip existing files
Andre Heinecke <aheinecke@intevation.de>
parents: 15
diff changeset
388 }
c12825a651ed Read out content-length and use this to skip existing files
Andre Heinecke <aheinecke@intevation.de>
parents: 15
diff changeset
389
c12825a651ed Read out content-length and use this to skip existing files
Andre Heinecke <aheinecke@intevation.de>
parents: 15
diff changeset
390 if (contentLength) {
c12825a651ed Read out content-length and use this to skip existing files
Andre Heinecke <aheinecke@intevation.de>
parents: 15
diff changeset
391 QFileInfo finf(fileName);
c12825a651ed Read out content-length and use this to skip existing files
Andre Heinecke <aheinecke@intevation.de>
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diff changeset
392 if (finf.exists() && finf.isReadable() &&
c12825a651ed Read out content-length and use this to skip existing files
Andre Heinecke <aheinecke@intevation.de>
parents: 15
diff changeset
393 finf.size() == contentLength) {
c12825a651ed Read out content-length and use this to skip existing files
Andre Heinecke <aheinecke@intevation.de>
parents: 15
diff changeset
394 // We already have data of the same size
c12825a651ed Read out content-length and use this to skip existing files
Andre Heinecke <aheinecke@intevation.de>
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diff changeset
395 // No need to waste bandwidth.
c12825a651ed Read out content-length and use this to skip existing files
Andre Heinecke <aheinecke@intevation.de>
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diff changeset
396 DEBUG << "Skipping download because file exists";
c12825a651ed Read out content-length and use this to skip existing files
Andre Heinecke <aheinecke@intevation.de>
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diff changeset
397 retval = true;
23
7d07d261b003 Wrap HINTERNET handles in a class to take advantage of scoping
Andre Heinecke <aheinecke@intevation.de>
parents: 20
diff changeset
398 return retval;
17
c12825a651ed Read out content-length and use this to skip existing files
Andre Heinecke <aheinecke@intevation.de>
parents: 15
diff changeset
399 }
c12825a651ed Read out content-length and use this to skip existing files
Andre Heinecke <aheinecke@intevation.de>
parents: 15
diff changeset
400 }
c12825a651ed Read out content-length and use this to skip existing files
Andre Heinecke <aheinecke@intevation.de>
parents: 15
diff changeset
401
15
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
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diff changeset
402 // Open / Create the file to write to.
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
403 if (!outputFile.open(QIODevice::WriteOnly)) {
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
404 DEBUG << "Failed to open file";
23
7d07d261b003 Wrap HINTERNET handles in a class to take advantage of scoping
Andre Heinecke <aheinecke@intevation.de>
parents: 20
diff changeset
405 return retval;
15
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
406 }
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
407
17
c12825a651ed Read out content-length and use this to skip existing files
Andre Heinecke <aheinecke@intevation.de>
parents: 15
diff changeset
408 DEBUG << "output file size: " << outputFile.size();
15
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
409 do
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
410 {
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
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diff changeset
411 char outBuf[8192]; // 8KB is the internal buffer size of winhttp
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
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diff changeset
412 memset(outBuf, 0, sizeof(outBuf));
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
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diff changeset
413 bytesRead = 0;
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
414
23
7d07d261b003 Wrap HINTERNET handles in a class to take advantage of scoping
Andre Heinecke <aheinecke@intevation.de>
parents: 20
diff changeset
415 if (!WinHttpQueryDataAvailable(sHRequest.handle, &bytesAvailable)) {
15
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
416 DEBUG << "Querying for available data failed";
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
417 retval = false;
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
418 break;
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
419 }
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
420
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
421 if (!bytesAvailable) {
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
422 // Might indicate that we are done.
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
423 break;
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
424 }
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
425
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
426 if (bytesAvailable > maxSize) {
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
427 DEBUG << "File to large";
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
428 retval = false;
23
7d07d261b003 Wrap HINTERNET handles in a class to take advantage of scoping
Andre Heinecke <aheinecke@intevation.de>
parents: 20
diff changeset
429 SetLastError(ERROR_INVALID_DATA);
15
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
430 break;
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
431 }
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
432
23
7d07d261b003 Wrap HINTERNET handles in a class to take advantage of scoping
Andre Heinecke <aheinecke@intevation.de>
parents: 20
diff changeset
433 if (!WinHttpReadData(sHRequest.handle, (LPVOID)outBuf,
15
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
434 sizeof(outBuf), &bytesRead)) {
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
435 DEBUG << "Error reading data";
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
436 break;
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
437 } else {
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
438 if (bytesRead) {
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
439 // Write data to file.
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
440 if (outputFile.write(outBuf, bytesRead) !=
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
441 bytesRead) {
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
442 DEBUG << "Error writing to file.";
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
443 retval = false;
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
444 }
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
445 // Completed a read / write cycle. If not error follows
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
446 // the download was successful.
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
447 retval = true;
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
448 } else {
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
449 // Should not happen as we queried for available
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
450 // bytes before and the function did not return an
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
451 // error.
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
452 DEBUG << "Unable to read available data";
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
453 retval = false;
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
454 break;
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
455 }
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
456 }
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
457 totalDownloaded += bytesRead;
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
458
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
459 if (totalDownloaded > maxSize) {
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
460 DEBUG << "Downloaded too much data. Breaking.";
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
461 retval = false;
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
462 break;
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
463 }
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
464 } while (bytesAvailable > 0);
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
465
17
c12825a651ed Read out content-length and use this to skip existing files
Andre Heinecke <aheinecke@intevation.de>
parents: 15
diff changeset
466 if (retval && outputFile.isOpen()) {
15
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
467 // Actually save the file to disk / move to homedir
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
468 retval = outputFile.commit();
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
469 }
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
470
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
471 return retval;
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
472 }
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
473
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
474 void Downloader::run() {
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
475 bool results = false;
23
7d07d261b003 Wrap HINTERNET handles in a class to take advantage of scoping
Andre Heinecke <aheinecke@intevation.de>
parents: 20
diff changeset
476 SmartHINTERNET sHSession;
7d07d261b003 Wrap HINTERNET handles in a class to take advantage of scoping
Andre Heinecke <aheinecke@intevation.de>
parents: 20
diff changeset
477 SmartHINTERNET sHConnect;
15
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
478 wchar_t wUrl[mUrl.size() + 1];
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
479 QDateTime lastModifiedSoftware;
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
480 QDateTime lastModifiedList;
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
481
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
482 int rc = 0;
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
483
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
484 memset(wUrl, 0, sizeof (wchar_t) * (mUrl.size() + 1));
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
485
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
486 rc = mUrl.toWCharArray(wUrl);
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
487
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
488 if (rc != mUrl.size()) {
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
489 DEBUG << "Problem converting to wchar array";
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
490 return;
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
491 }
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
492
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
493 // Should not be necessary because we initialized the memory
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
494 wUrl[rc] = '\0';
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
495
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
496 // Initialize connection
23
7d07d261b003 Wrap HINTERNET handles in a class to take advantage of scoping
Andre Heinecke <aheinecke@intevation.de>
parents: 20
diff changeset
497 if (!openSession(&sHConnect.handle)) {
15
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
498 DEBUG << "Failed to open session: " << getLastErrorMsg();
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
499 return;
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
500 }
23
7d07d261b003 Wrap HINTERNET handles in a class to take advantage of scoping
Andre Heinecke <aheinecke@intevation.de>
parents: 20
diff changeset
501 if (!initializeConnection(sHConnect.handle, &sHConnect.handle, wUrl)) {
15
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
502 DEBUG << "Failed to initialize connection: " << getLastErrorMsg();
23
7d07d261b003 Wrap HINTERNET handles in a class to take advantage of scoping
Andre Heinecke <aheinecke@intevation.de>
parents: 20
diff changeset
503 return;
15
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
504 }
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
505
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
506
23
7d07d261b003 Wrap HINTERNET handles in a class to take advantage of scoping
Andre Heinecke <aheinecke@intevation.de>
parents: 20
diff changeset
507 lastModifiedSoftware = getLastModifiedHeader(sHConnect.handle, sHConnect.handle,
17
c12825a651ed Read out content-length and use this to skip existing files
Andre Heinecke <aheinecke@intevation.de>
parents: 15
diff changeset
508 L""SW_RESOURCE);
15
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
509
23
7d07d261b003 Wrap HINTERNET handles in a class to take advantage of scoping
Andre Heinecke <aheinecke@intevation.de>
parents: 20
diff changeset
510 lastModifiedList = getLastModifiedHeader(sHConnect.handle, sHConnect.handle,
17
c12825a651ed Read out content-length and use this to skip existing files
Andre Heinecke <aheinecke@intevation.de>
parents: 15
diff changeset
511 L""LIST_RESOURCE);
15
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
512
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
513 if (!lastModifiedList.isValid() || !lastModifiedSoftware.isValid()) {
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
514 DEBUG << "Could not read headers: " << getLastErrorMsg();
23
7d07d261b003 Wrap HINTERNET handles in a class to take advantage of scoping
Andre Heinecke <aheinecke@intevation.de>
parents: 20
diff changeset
515 return;
15
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
516 }
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
517
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
518 if (!mLastModSW.isValid() || lastModifiedSoftware > mLastModSW) {
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
519 QString dataDirectory = getDataDirectory();
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
520
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
521 if (dataDirectory.isEmpty()) {
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
522 DEBUG << "Failed to get data directory";
23
7d07d261b003 Wrap HINTERNET handles in a class to take advantage of scoping
Andre Heinecke <aheinecke@intevation.de>
parents: 20
diff changeset
523 return;
15
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
524 }
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
525
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
526 QString fileName = dataDirectory.append("/SW-")
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
527 .append(lastModifiedSoftware.toString("yyyymmddHHmmss"))
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
528 .append(".exe");
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
529
17
c12825a651ed Read out content-length and use this to skip existing files
Andre Heinecke <aheinecke@intevation.de>
parents: 15
diff changeset
530 DEBUG << "fileName: " << fileName;
15
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
531
23
7d07d261b003 Wrap HINTERNET handles in a class to take advantage of scoping
Andre Heinecke <aheinecke@intevation.de>
parents: 20
diff changeset
532 if (!downloadFile(sHConnect.handle, sHConnect.handle, L""SW_RESOURCE,
15
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
533 fileName, MAX_SW_SIZE)) {
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
534 DEBUG << "Error downloading File: " << getLastErrorMsg();
23
7d07d261b003 Wrap HINTERNET handles in a class to take advantage of scoping
Andre Heinecke <aheinecke@intevation.de>
parents: 20
diff changeset
535 return;
15
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
536 }
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
537
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
538 emit newSoftwareAvailable(fileName, lastModifiedSoftware);
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
539 } else if (!mLastModList.isValid() || lastModifiedList > mLastModList) {
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
540 QString dataDirectory = getDataDirectory();
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
541
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
542 if (dataDirectory.isEmpty()) {
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
543 DEBUG << "Failed to get data directory";
23
7d07d261b003 Wrap HINTERNET handles in a class to take advantage of scoping
Andre Heinecke <aheinecke@intevation.de>
parents: 20
diff changeset
544 return;
15
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
545 }
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
546
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
547 QString fileName = dataDirectory.append("/list-")
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
548 .append(lastModifiedSoftware.toString("yyyymmddHHmmss"))
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
549 .append(".txt");
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
550
17
c12825a651ed Read out content-length and use this to skip existing files
Andre Heinecke <aheinecke@intevation.de>
parents: 15
diff changeset
551 DEBUG << "fileName: " << fileName;
15
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
552
23
7d07d261b003 Wrap HINTERNET handles in a class to take advantage of scoping
Andre Heinecke <aheinecke@intevation.de>
parents: 20
diff changeset
553 if (!downloadFile(sHConnect.handle, sHConnect.handle, L""LIST_RESOURCE,
15
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
554 fileName, MAX_LIST_SIZE)) {
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
555 DEBUG << "Error downloading File: " << getLastErrorMsg();
23
7d07d261b003 Wrap HINTERNET handles in a class to take advantage of scoping
Andre Heinecke <aheinecke@intevation.de>
parents: 20
diff changeset
556 return;
15
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
557 }
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
558
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
559 emit newListAvailable(fileName, lastModifiedList);
95e1b6edf2fc Implement more downloader functionality for Windows
Andre Heinecke <aheinecke@intevation.de>
parents: 11
diff changeset
560 }
95e1b6edf2fc Implement more downloader functionality for Windows
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561
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562 DEBUG << "SW date: " << lastModifiedSoftware;
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563 DEBUG << "List date: " << lastModifiedList;
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564
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565 if (!results) {
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566 // Report any errors.
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567 DEBUG << "Error" << GetLastError();
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568 emit error(tr("Unknown Problem when connecting"), ErrUnknown);
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569 }
20
fec1a610d43f Mark usage of goto with TODOs to remove them
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570
11
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parents:
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571 return;
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572 }
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573 #endif

http://wald.intevation.org/projects/trustbridge/