76 lines
2.2 KiB
PHP
76 lines
2.2 KiB
PHP
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<?php
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/**
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* Shows a thumbnail or a full size screenshot.
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*
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* Mandatory parameters:
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* - iId, image identifier
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*
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* Optional parameters:
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* - bThumbnail, "true" if we want to see a thumbnail, "false" otherwise
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* - sREQUEST_METHOD
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*
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* TODO:
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* - rename and document sREQUEST_METHOD
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* - replace iId with iScreenshotId
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*/
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// application environment
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require("path.php");
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require(BASE."include/incl.php");
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require_once(BASE."include/screenshot.php");
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// an image doesn't have a link, so a cookie makes no sense
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header("Set-Cookie: ");
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header("Pragma: ");
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// is the user supposed to be viewing this image ?
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if(!$_SESSION['current']->canViewImage($aClean['iId']))
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util_show_error_page_and_exit("Insufficient privileges.");
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$oScreenshot = new Screenshot($aClean['iId']);
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$fImage = fopen(appdb_fullpath("data/screenshots/".$oScreenshot->sUrl), "rb");
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/* if we can open the image we should get its last modified time and read */
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/* a few bytes from its header information and close it */
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if($fImage)
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{
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$fstat_val = fstat($fImage);
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$iModTime = $fstat_val['mtime'];
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$sMagic = fread($fImage, 8); /* read 8 bytes from the header, that lets us idenfity the type of
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image without loading it */
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fclose($fImage); /* don't leave the fopened image open */
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}
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/* identify what kind of image this is, if we can't identify it */
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/* we should report that its a bad image */
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if (strcmp("\x89PNG\r\n\x1A\n", $sMagic)==0)
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{
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header("Content-Type: image/png");
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} else if (preg_match("^\xD8\xFF^", $sMagic)) {
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header("Content-Type: image/jpeg");
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} else {
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header("500 Bad image format");
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exit;
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}
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header("Cache-Control: public");
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header("Expires: ");
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/* if the browser is asking if the file was modified since a particular date */
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/* and the date is the same that the file was modified, then we can report */
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/* that the file wasn't modified, the browser can used the cached image */
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if (isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) &&
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$iModTime == pHttpDate($_SERVER['HTTP_IF_MODIFIED_SINCE']))
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{
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header("HTTP/1.0 304 Not Modified");
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exit;
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}
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header("Last-Modified: ".fHttpDate($iModTime));
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if(!$aClean['bThumbnail'])
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$oScreenshot->output_screenshot(false);
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else
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$oScreenshot->output_screenshot(true);
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?>
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