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Merge branch 'MDL-49103-master' of git://github.com/sarjona/moodle

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This commit is contained in:
Andrew Nicols 2020-02-05 13:48:29 +08:00
commit 097677f765
2 changed files with 48 additions and 9 deletions
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46
badges/lib/bakerlib.php
View File

@ -114,23 +114,59 @@ class PNG_MetaDataHandler
* @param string $value Currently an assertion URL that is added to an image metadata.
*
* @return string $result File content with a new chunk as a string. Can be used in file_put_contents() to write to a file.
* @throws \moodle_exception when unsupported chunk type is defined.
*/
public function add_chunks($type, $key, $value) {
if (strlen($key) > 79) {
debugging('Key is too big');
}
// tEXt Textual data.
// Keyword: 1-79 bytes (character string)
// Null separator: 1 byte
// Text: n bytes (character string)
$data = $key . "\0" . $value;
$dataparts = [];
if ($type === 'iTXt') {
// International textual data (iTXt).
// Keyword: 1-79 bytes (character string).
$dataparts[] = $key;
// Null separator: 1 byte.
$dataparts[] = "\x00";
// Compression flag: 1 byte
// A value of 0 means no compression.
$dataparts[] = "\x00";
// Compression method: 1 byte
// If compression is disabled, the method should also be 0.
$dataparts[] = "\x00";
// Language tag: 0 or more bytes (character string)
// When there is no language specified leave empty.
// Null separator: 1 byte.
$dataparts[] = "\x00";
// Translated keyword: 0 or more bytes
// When there is no translation specified, leave empty.
// Null separator: 1 byte.
$dataparts[] = "\x00";
// Text: 0 or more bytes.
$dataparts[] = $value;
} else if ($type === 'tEXt') {
// Textual data (tEXt).
// Keyword: 1-79 bytes (character string).
$dataparts[] = $key;
// Null separator: 1 byte.
$dataparts[] = "\0";
// Text: n bytes (character string).
$dataparts[] = $value;
} else {
throw new \moodle_exception('Unsupported chunk type: ' . $type);
}
$data = implode($dataparts);
$crc = pack("N", crc32($type . $data));
$len = pack("N", strlen($data));
// Chunk format: length + type + data + CRC.
// CRC is a CRC-32 computed over the chunk type and chunk data.
$newchunk = $len . $type . $data . $crc;
$this->_chunks[$type] = $data;
$result = substr($this->_contents, 0, $this->_size - 12)
. $newchunk

11
lib/badgeslib.php
View File

@ -503,10 +503,13 @@ function badges_bake($hash, $badgeid, $userid = 0, $pathhash = false) {
$contents = $file->get_content();
$filehandler = new PNG_MetaDataHandler($contents);
$assertion = new moodle_url('/badges/assertion.php', array('b' => $hash));
if ($filehandler->check_chunks("tEXt", "openbadges")) {
// Add assertion URL tExt chunk.
$newcontents = $filehandler->add_chunks("tEXt", "openbadges", $assertion->out(false));
// For now, the site backpack OB version will be used as default.
$obversion = badges_open_badges_backpack_api();
$assertion = new core_badges_assertion($hash, $obversion);
$assertionjson = json_encode($assertion->get_badge_assertion());
if ($filehandler->check_chunks("iTXt", "openbadges")) {
// Add assertion URL iTXt chunk.
$newcontents = $filehandler->add_chunks("iTXt", "openbadges", $assertionjson);
$fileinfo = array(
'contextid' => $user_context->id,
'component' => 'badges',