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annotate ui/downloader.h @ 32:d8e93fa1fc93

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Downloader logic
author Andre Heinecke <andre.heinecke@intevation.de>
date Wed, 12 Mar 2014 21:26:07 +0100
parents 62cd56cea09b
children c6125d73faf4
rev   line source
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1 #ifndef DOWNLOADER_H
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2 #define DOWNLOADER_H
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3 /**
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4 * @file downloader.h
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5 * @brief High level API to download necessary data.
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6 *
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7 */
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8
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9 #include <QThread>
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10 #include <QString>
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11 #include <QByteArray>
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12 #include <QDateTime>
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13 #include <QUrl>
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14
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15 #include <polarssl/x509_crt.h>
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16 #include <polarssl/entropy.h>
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17 #include <polarssl/ctr_drbg.h>
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18 #include <polarssl/ssl.h>
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19
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20 class Downloader: public QThread
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21 {
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22 Q_OBJECT
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23
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24 public:
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25 /**
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26 * @brief Construct a downloader with a specific certificate
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27 *
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28 * The downloader will check the last-modified date of the
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29 * certificate list / sw on the server at the specified url
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30 * and download those accordingly. If newestSW or newestList is
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31 * are valid datetimes only files modified after the respective date
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32 * are downloaded.
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33 *
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34 * Downloaded files are placed in QStandardPaths::DataLocation
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35 *
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36 * @param[in] parent the parent object.
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37 * @param[in] url the Url to download data from
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38 * @param[in] certificate optional certificate to validate https connection
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39 * @param[in] newestSW datetime after which software should be downloaded
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40 * @param[in] newestList datetime after which the list should be downloaded
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41 */
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42 Downloader(QObject* parent, const QString& url,
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43 const QByteArray& certificate = QByteArray(),
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44 const QDateTime& newestSW = QDateTime(),
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45 const QDateTime& newestList = QDateTime());
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46
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47 ~Downloader();
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48
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49 enum ErrorCode {
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50 NoError,
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51 NoConnection,
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52 SSLHandshakeFailed,
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53 InvalidCertificate,
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54 InvalidPinnedCertificate,
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55 InvalidResponse,
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56 ConnectionLost,
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57 Timeout,
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58 ErrUnknown
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59 };
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60
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61 /**
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62 * @brief get the directory where the downloader saves data
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63 *
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64 * If the directory does not exist this function ensures that it
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65 * is created.
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66 *
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67 * @returns The directory in which downloaded files are placed.
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68 **/
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69 QString getDataDirectory();
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70
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71 /**
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72 * @brief get the current error state
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73 *
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74 * @returns The current error state.
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75 **/
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76 ErrorCode getErrorState();
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78 protected:
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79 void run();
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81 private:
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82 QUrl mUrl;
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83 QByteArray mPinnedCert;
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84 x509_crt mX509PinnedCert;
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85 entropy_context mEntropy;
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86 ctr_drbg_context mCtr_drbg;
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87 ssl_context mSSL;
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88
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89 QDateTime mLastModSW;
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90 QDateTime mLastModList;
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91
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92 /* Convienience to avoid having to parse all
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93 * PolarSSL errors */
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94 ErrorCode mErrorState;
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95
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96 bool mInitialized;
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97 bool mConnectionEstablished;
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98
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99 int mServerFD;
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100
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101
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102 /* @brief: Initialize polarssl structures
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103 *
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104 * This wraps polarssl initialization functions
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105 * that can return an error.
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106 * Sets the error state accordingly.
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107 *
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108 * @returns: 0 on success a polarssl error otherwise.
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109 */
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110 int init();
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111
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112 /** @brief: Establish the ssl connection
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113 *
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114 * Modifies the error state. Before calling this the mServerFD should
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115 * be set to a valid socket.
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116 *
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117 * @returns 0 on success otherwise a polarssl error or -1 is returned
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118 */
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119 int establishSSLConnection();
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120
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121 /** @brief get the last modified header of a resource.
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122 *
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123 * Connection should be established beforehand.
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124 * Modifies the error state.
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125 *
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126 * @param[in] resource The resource to check
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127 *
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128 * @returns the last modified date or a null datetime in case of errors
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129 */
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130 QDateTime getLastModifiedHeader(const QString &resource);
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131
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132 /** @brief Download resource
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133 *
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134 * Download a resource with the established connection.
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135 * Modifies the error state.
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136 *
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137 * @param[in] resource the resource to download
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138 * @param[in] filename where the file should be saved.
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139 * @param[in] maxSize maximum amount of bytes to download
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140 *
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141 * @returns True if the download was successful.
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142 */
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143 bool downloadFile(const QString &resource, const QString &filename,
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144 size_t maxSize);
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145
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146 Q_SIGNALS:
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147 /**
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148 * @brief software update is available
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149 */
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150 void newSoftwareAvailable(const QString &fileName,
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151 const QDateTime &lastMod);
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152
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153 /**
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154 * @brief new certificate list available
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155 */
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156 void newListAvailable(const QString &fileName, const QDateTime &lastMod);
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157
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158 /**
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159 * @brief Some progress has been made.
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160 *
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161 * @param[out] message: A message to show. Can be empty.
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162 * @param[out] current: Value of current progress.
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163 * @param[out] total: Total value of possible progress
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164 */
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165 void progress(const QString &message, int current, int total);
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166
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167 /**
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168 * @brief An error happened
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169 *
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170 * @param[out] message: A message to show. Can be empty.
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171 * @param[out] errorCode: ErrorCode of this error.
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172 */
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173 void error(const QString &message, Downloader::ErrorCode error);
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174 };
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175 #endif
http://wald.intevation.org/projects/trustbridge/