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annotate ui/downloader.h @ 346:a54925d41056

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author Andre Heinecke <andre.heinecke@intevation.de>
date Thu, 10 Apr 2014 11:15:23 +0200
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children 17e1c8f37d72
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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 <QDateTime>
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11 #include <QString>
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12 #include <QByteArray>
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13
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14 #include "sslconnection.h"
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16 class Downloader: public QThread
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17 {
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18 Q_OBJECT
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19
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20 public:
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21 /**
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22 * @brief Construct a downloader with a specific certificate
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23 *
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24 * The downloader will check the last-modified date of the
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25 * certificate list / sw on the server at the specified url
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26 * and download those accordingly. If newestSW or newestList is
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27 * are valid datetimes only files modified after the respective date
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28 * are downloaded.
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29 *
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30 * Downloaded files are placed in QStandardPaths::DataLocation
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31 *
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32 * @param[in] parent the parent object.
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33 * @param[in] url the Url to download data from
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34 * @param[in] certificate optional certificate to validate https connection
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35 * @param[in] newestSW datetime after which software should be downloaded
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36 * @param[in] newestList datetime after which the list should be downloaded
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37 * @param[in] resourceSW the path where the software is to be found
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38 * @param[in] resourceList the path where the list is to be found
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39 */
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40 Downloader(QObject* parent, const QString& url,
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41 const QByteArray& certificate = QByteArray(),
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42 const QDateTime& newestSW = QDateTime(),
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43 const QDateTime& newestList = QDateTime(),
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44 const QString& resourceSW = QString(),
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45 const QString& resourceList = QString());
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46
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47 ~Downloader();
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48
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49 /**
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50 * @brief get the directory where the downloader saves data
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51 *
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52 * If the directory does not exist this function ensures that it
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53 * is created.
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54 *
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55 * @returns The directory in which downloaded files are placed.
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56 **/
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57 QString getDataDirectory();
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58
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59 /**
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60 * @brief get the current error state
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61 *
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62 * @returns The current error state.
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63 **/
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64 SSLConnection::ErrorCode getErrorState();
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65
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66 protected:
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67 void run();
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68
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69 private:
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70 QDateTime mLastModSW;
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71 QDateTime mLastModList;
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72
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73 QString mResourceSW;
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74 QString mResourceList;
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75
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76 SSLConnection mSSLConnection;
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77
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78 /** @brief get the last modified header of a resource.
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79 *
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80 * Connection should be established beforehand.
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81 * Modifies the error state.
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82 *
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83 * @param[in] resource The resource to check
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84 *
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85 * @returns the last modified date or a null datetime in case of errors
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86 */
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87 QDateTime getLastModifiedHeader(const QString &resource);
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88
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89 /** @brief Download resource
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90 *
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91 * Download a resource with the established connection.
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92 * Modifies the error state.
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93 *
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94 * @param[in] resource the resource to download
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95 * @param[in] filename where the file should be saved.
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96 * @param[in] maxSize maximum amount of bytes to download
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97 *
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98 * @returns True if the download was successful.
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99 */
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100 bool downloadFile(const QString &resource, const QString &filename,
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101 size_t maxSize);
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102 /**
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103 * @brief parses the Headers of a repsonse.
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104 *
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105 * This removes the headers from the byte array passed as
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106 * parameter.
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107 *
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108 * @param[inout] data: The response to parse.
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109 *
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110 * @returns: A map of the header fields. Or an empty map on error.
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111 */
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112 QMap<QString, QString> parseHeaders(QByteArray *data);
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113
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114 Q_SIGNALS:
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115 /**
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116 * @brief software update is available
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117 */
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118 void newSoftwareAvailable(const QString &fileName,
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119 const QDateTime &lastMod);
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120
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121 /**
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122 * @brief new certificate list available
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123 */
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124 void newListAvailable(const QString &fileName, const QDateTime &lastMod);
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125
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126 /**
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127 * @brief Some progress has been made.
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128 *
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129 * @param[out] message: A message to show. Can be empty.
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130 * @param[out] current: Value of current progress.
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131 * @param[out] total: Total value of possible progress
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132 */
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133 void progress(const QString &message, int current, int total);
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134
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135 /**
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136 * @brief An error happened
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137 *
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138 * @param[out] message: A message to show. Can be empty.
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139 * @param[out] errorCode: ErrorCode of this error.
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140 */
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141 void error(const QString &message, SSLConnection::ErrorCode error);
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142 };
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143 #endif
http://wald.intevation.org/projects/trustbridge/