annotate ui/downloader.h @ 856:797aa8d9c785

(issue48) Fallback to HKEY_USERS on hive load failure If the hive can not be loaded it might mean that the user is currently logged on. In that case we can access his registry via HKEY_USERS.
author Andre Heinecke <andre.heinecke@intevation.de>
date Thu, 31 Jul 2014 12:56:26 +0200
parents 5834b340c54c
children d1c951b3012d
rev   line source
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1 /* Copyright (C) 2014 by Bundesamt für Sicherheit in der Informationstechnik
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2 * Software engineering by Intevation GmbH
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3 *
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4 * This file is Free Software under the GNU GPL (v>=2)
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5 * and comes with ABSOLUTELY NO WARRANTY!
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6 * See LICENSE.txt for details.
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7 */
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8 #ifndef DOWNLOADER_H
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9 #define DOWNLOADER_H
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10 /**
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11 * @file downloader.h
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12 * @brief High level API to download necessary data.
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13 *
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14 */
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15
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16 #include <QThread>
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17 #include <QDateTime>
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18 #include <QString>
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19 #include <QByteArray>
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20
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21 #include "sslconnection.h"
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22
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23 class Downloader: public QThread
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24 {
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25 Q_OBJECT
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26
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27 public:
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28 /**
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29 * @brief Construct a downloader with a specific certificate
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30 *
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31 * The downloader will check the last-modified date of the
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32 * certificate list / sw on the server at the specified url
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33 * and download those accordingly. If newestSW or newestList is
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34 * are valid datetimes only files modified after the respective date
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35 * are downloaded.
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36 *
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37 * Downloaded files are placed in QStandardPaths::DataLocation
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38 *
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39 * @param[in] parent the parent object.
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40 * @param[in] url the Url to download data from
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41 * @param[in] certificate optional certificate to validate https connection
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42 * @param[in] newestSW datetime after which software should be downloaded
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43 * @param[in] newestList datetime after which the list should be downloaded
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44 * @param[in] resourceSW the path where the software is to be found
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45 * @param[in] resourceList the path where the list is to be found
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46 */
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47 Downloader(QObject* parent, const QString& url,
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48 const QByteArray& certificate = QByteArray(),
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49 const QDateTime& newestSW = QDateTime(),
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50 const QDateTime& newestList = QDateTime(),
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51 const QString& resourceSW = QString(),
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52 const QString& resourceList = QString(),
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53 bool downloadSW = true);
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54
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55 ~Downloader();
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56
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57 /**
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58 * @brief get the directory where the downloader saves data
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59 *
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60 * If the directory does not exist this function ensures that it
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61 * is created.
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62 *
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63 * @returns The directory in which downloaded files are placed.
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64 **/
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65 QString getDataDirectory();
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66
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67 /**
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68 * @brief get the current error state
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69 *
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70 * @returns The current error state.
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71 **/
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72 SSLConnection::ErrorCode getErrorState();
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73
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74 protected:
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75 void run();
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76
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77 private:
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78 QDateTime mLastModSW;
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79 QDateTime mLastModList;
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80
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81 QString mResourceSW;
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82 QString mResourceList;
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83
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84 bool mDownloadSW;
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85
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86 SSLConnection mSSLConnection;
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87
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88 /** @brief get the last modified header of a resource.
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89 *
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90 * Connection should be established beforehand.
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91 * Modifies the error state.
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92 *
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93 * @param[in] resource The resource to check
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94 *
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95 * @returns the last modified date or a null datetime in case of errors
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96 */
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97 QDateTime getLastModifiedHeader(const QString &resource);
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98
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99 /** @brief Download resource
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100 *
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101 * Download a resource with the established connection.
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102 * Modifies the error state.
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103 *
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104 * @param[in] resource the resource to download
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105 * @param[in] filename where the file should be saved.
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106 * @param[in] maxSize maximum amount of bytes to download
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107 *
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108 * @returns True if the download was successful.
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109 */
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110 bool downloadFile(const QString &resource, const QString &filename,
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111 size_t maxSize);
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112 /**
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113 * @brief parses the Headers of a repsonse.
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114 *
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115 * This removes the headers from the byte array passed as
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116 * parameter.
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117 *
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118 * @param[inout] data: The response to parse.
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119 *
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120 * @returns: A map of the header fields. Or an empty map on error.
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121 */
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122 QMap<QString, QString> parseHeaders(QByteArray *data);
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123
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124 Q_SIGNALS:
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125 /**
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126 * @brief software update is available
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127 */
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128 void newSoftwareAvailable(const QString &fileName,
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129 const QDateTime &lastMod);
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130
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131 /**
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132 * @brief new certificate list available
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133 */
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134 void newListAvailable(const QString &fileName, const QDateTime &lastMod);
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135
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136 /**
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137 * @brief Some progress has been made.
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138 *
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139 * @param[out] message: A message to show. Can be empty.
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140 * @param[out] current: Value of current progress.
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141 * @param[out] total: Total value of possible progress
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142 */
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143 void progress(const QString &message, int current, int total);
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144
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145 /**
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146 * @brief An error happened
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147 *
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148 * @param[out] message: A message to show. Can be empty.
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149 * @param[out] errorCode: ErrorCode of this error.
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150 */
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151 void error(const QString &message, SSLConnection::ErrorCode error);
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152
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153 /**
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154 * @brief Found the last modified date for software.
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155 *
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156 * @param[out] date The last modified date.
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157 */
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158 void lastModifiedDate(const QDateTime &date);
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159 };
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160 #endif

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