public function test_generate_image_thumbnail_from_string()
{
global $CFG;
require_once $CFG->libdir . '/gdlib.php';
// Test with meaningless data.
// First empty values.
$this->assertFalse(generate_image_thumbnail_from_string('', 24, 24));
$this->assertFalse(generate_image_thumbnail_from_string('invalid', 0, 24));
$this->assertFalse(generate_image_thumbnail_from_string('invalid', 24, 0));
// Now an invalid string.
$this->assertFalse(generate_image_thumbnail_from_string('invalid', 24, 24));
// Now use a fixture.
$pngpath = $this->fixturepath . 'gd-logo.png';
$pngdata = file_get_contents($pngpath);
$pngthumb = generate_image_thumbnail_from_string($pngdata, 24, 24);
$this->assertTrue(is_string($pngthumb));
// And check that the generated image was of the correct proportions and mimetype.
$imageinfo = getimagesizefromstring($pngthumb);
$this->assertEquals(24, $imageinfo[0]);
$this->assertEquals(24, $imageinfo[1]);
$this->assertEquals('image/png', $imageinfo['mime']);
}
/**
* Returns the stored thumbnail file, generates it if not present.
*
* @param string $filepath current path in repository (dir and filename)
* @param string $thumbsize 'thumb' or 'icon'
* @return null|stored_file
*/
public function get_thumbnail($filepath, $thumbsize)
{
global $CFG;
$filepath = trim($filepath, '/');
$origfile = $this->get_rootpath() . $filepath;
// As thumbnail filename we use original file content hash.
if (!$this->is_in_repository($filepath) || !($filecontents = @file_get_contents($origfile))) {
// File is not found or is not readable.
return null;
}
$filename = sha1($filecontents);
// Try to get generated thumbnail for this file.
$fs = get_file_storage();
if (!($file = $fs->get_file(SYSCONTEXTID, 'repository_filesystem', $thumbsize, $this->id, '/' . $filepath . '/', $filename))) {
// Thumbnail not found . Generate and store thumbnail.
require_once $CFG->libdir . '/gdlib.php';
if ($thumbsize === 'thumb') {
$size = 90;
} else {
$size = 24;
}
if (!($data = generate_image_thumbnail_from_string($filecontents, $size, $size))) {
// Generation failed.
return null;
}
$record = array('contextid' => SYSCONTEXTID, 'component' => 'repository_filesystem', 'filearea' => $thumbsize, 'itemid' => $this->id, 'filepath' => '/' . $filepath . '/', 'filename' => $filename);
$file = $fs->create_file_from_string($record, $data);
}
return $file;
}
