1 | <?php |
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2 | /** |
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3 | * Handles download requests based on logic provided by the callback function. |
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4 | * @param array $request Information about HTTP request |
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5 | * @param string $callback Function that provides the logic for the download process. |
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6 | * @return void |
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7 | * @license http://www.gnu.org/copyleft/gpl.html GPL |
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8 | * @package Workflow |
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9 | * @subpackage local |
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10 | * @access public |
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11 | */ |
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12 | function wf_handle_download($request, $callback) |
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13 | { |
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14 | /* check if it is in download mode */ |
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15 | if (!isset($request['download_mode'])) |
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16 | return; |
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17 | else |
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18 | if ($request['download_mode'] != "true") |
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19 | return; |
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20 | |
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21 | /* verify if the callback function exists and is callable */ |
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22 | if ((function_exists($callback)) && (is_callable($callback))) |
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23 | { |
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24 | /* prepare the parameters */ |
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25 | $params = array(); |
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26 | foreach ($request as $key => $value) |
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27 | $params[$key] = $value; |
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28 | |
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29 | /* call the callback function and await the result */ |
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30 | $fileResult = call_user_func($callback, $params); |
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31 | |
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32 | /* if everything is ok, then proceed with the download of the file */ |
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33 | if (!is_null($fileResult)) |
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34 | { |
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35 | if (isset($fileResult['filename']) && isset($fileResult['content'])) |
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36 | { |
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37 | if (ereg('Opera(/| )([0-9].[0-9]{1,2})', $_SERVER['HTTP_USER_AGENT'])) |
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38 | $UserBrowser = "Opera"; |
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39 | elseif (ereg('MSIE ([0-9].[0-9]{1,2})', $_SERVER['HTTP_USER_AGENT'])) |
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40 | $UserBrowser = "IE"; |
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41 | else |
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42 | $UserBrowser = ''; |
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43 | |
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44 | $mime_type = ($UserBrowser == 'IE' || $UserBrowser == 'Opera') ? 'application/octetstream' : 'application/octet-stream'; |
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45 | header("Pragma: public"); |
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46 | header("Cache-Control: cache, must-revalidate"); |
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47 | header("Content-Type: application/force-download"); |
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48 | header("Content-Disposition: attachment; filename=\"" . $fileResult['filename'] . "\""); |
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49 | header('Pragma: no-cache'); |
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50 | header("Expires: 0"); |
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51 | header("Content-length: " . strlen($fileResult['content'])); |
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52 | echo $fileResult['content']; |
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53 | die(); |
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54 | } |
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55 | } |
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56 | else |
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57 | die(); |
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58 | } |
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59 | } |
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60 | ?> |
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