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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* Recourse module like helper functions
*
* @package core
* @subpackage lib
* @copyright 2009 Petr Skoda (http://skodak.org)
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die();
/** Try the best way */
define('RESOURCELIB_DISPLAY_AUTO', 0);
/** Display using object tag */
define('RESOURCELIB_DISPLAY_EMBED', 1);
/** Display inside frame */
define('RESOURCELIB_DISPLAY_FRAME', 2);
/** Display normal link in new window */
define('RESOURCELIB_DISPLAY_NEW', 3);
/** Force download of file instead of display */
define('RESOURCELIB_DISPLAY_DOWNLOAD', 4);
/** Open directly */
define('RESOURCELIB_DISPLAY_OPEN', 5);
/** Open in "emulated" pop-up without navigation */
define('RESOURCELIB_DISPLAY_POPUP', 6);
/** Legacy files not needed or new resource */
define('RESOURCELIB_LEGACYFILES_NO', 0);
/** Legacy files conversion marked as completed */
define('RESOURCELIB_LEGACYFILES_DONE', 1);
/** Legacy files conversion in progress*/
define('RESOURCELIB_LEGACYFILES_ACTIVE', 2);
/**
* Try on demand migration of file from old course files
* @param string $filepath old file path
* @param int $cmid migrated course module if
* @param int $courseid
* @param string $component
* @param string $filearea new file area
* @param int $itemid migrated file item id
* @return mixed, false if not found, stored_file instance if migrated to new area
*/
function resourcelib_try_file_migration($filepath, $cmid, $courseid, $component, $filearea, $itemid) {
$fs = get_file_storage();
if (stripos($filepath, '/backupdata/') === 0 or stripos($filepath, '/moddata/') === 0) {
// do not steal protected files!
return false;
}
if (!$context = context_module::instance($cmid)) {
return false;
}
if (!$coursecontext = context_course::instance($courseid)) {
return false;
}
$fullpath = rtrim("/$coursecontext->id/course/legacy/0".$filepath, '/');
do {
if (!$file = $fs->get_file_by_hash(sha1($fullpath))) {
if ($file = $fs->get_file_by_hash(sha1("$fullpath/.")) and $file->is_directory()) {
if ($file = $fs->get_file_by_hash(sha1("$fullpath/index.htm"))) {
break;
}
if ($file = $fs->get_file_by_hash(sha1("$fullpath/index.html"))) {
break;
}
if ($file = $fs->get_file_by_hash(sha1("$fullpath/Default.htm"))) {
break;
}
}
return false;
}
} while (false);
// copy and keep the same path, name, etc.
$file_record = array('contextid'=>$context->id, 'component'=>$component, 'filearea'=>$filearea, 'itemid'=>$itemid);
try {
return $fs->create_file_from_storedfile($file_record, $file);
} catch (Exception $e) {
// file may exist - highly unlikely, we do not want upgrades to stop here
return false;
}
}
/**
* Returns list of available display options
* @param array $enabled list of options enabled in module configuration
* @param int $current current display options for existing instances
* @return array of key=>name pairs
*/
function resourcelib_get_displayoptions(array $enabled, $current=null) {
if (is_number($current)) {
$enabled[] = $current;
}
$options = array(RESOURCELIB_DISPLAY_AUTO => get_string('resourcedisplayauto'),
RESOURCELIB_DISPLAY_EMBED => get_string('resourcedisplayembed'),
RESOURCELIB_DISPLAY_FRAME => get_string('resourcedisplayframe'),
RESOURCELIB_DISPLAY_NEW => get_string('resourcedisplaynew'),
RESOURCELIB_DISPLAY_DOWNLOAD => get_string('resourcedisplaydownload'),
RESOURCELIB_DISPLAY_OPEN => get_string('resourcedisplayopen'),
RESOURCELIB_DISPLAY_POPUP => get_string('resourcedisplaypopup'));
$result = array();
foreach ($options as $key=>$value) {
if (in_array($key, $enabled)) {
$result[$key] = $value;
}
}
if (empty($result)) {
// there should be always something in case admin misconfigures module
$result[RESOURCELIB_DISPLAY_OPEN] = $options[RESOURCELIB_DISPLAY_OPEN];
}
return $result;
}
/**
* Tries to guess correct mimetype for arbitrary URL
* @param string $fullurl
* @return string mimetype
*/
function resourcelib_guess_url_mimetype($fullurl) {
global $CFG;
require_once("$CFG->libdir/filelib.php");
if ($fullurl instanceof moodle_url) {
$fullurl = $fullurl->out(false);
}
$matches = null;
if (preg_match("|^(.*)/[a-z]*file.php(\?file=)?(/[^&\?#]*)|", $fullurl, $matches)) {
// remove the special moodle file serving hacks so that the *file.php is ignored
$fullurl = $matches[1].$matches[3];
}
if (preg_match("|^(.*)#.*|", $fullurl, $matches)) {
// ignore all anchors
$fullurl = $matches[1];
}
if (strpos($fullurl, '.php')){
// we do not really know what is in general php script
return 'text/html';
} else if (substr($fullurl, -1) === '/') {
// directory index (http://example.com/smaples/)
return 'text/html';
} else if (strpos($fullurl, '//') !== false and substr_count($fullurl, '/') == 2) {
// just a host name (http://example.com), solves Australian servers "audio" problem too
return 'text/html';
} else {
// ok, this finally looks like a real file
$parts = explode('?', $fullurl);
$url = reset($parts);
return mimeinfo('type', $url);
}
}
/**
* Looks for the extension.
*
* @param string $fullurl
* @return string file extension
*/
function resourcelib_get_extension($fullurl) {
if ($fullurl instanceof moodle_url) {
$fullurl = $fullurl->out(false);
}
$matches = null;
if (preg_match("|^(.*)/[a-z]*file.php(\?file=)?(/.*)|", $fullurl, $matches)) {
// remove the special moodle file serving hacks so that the *file.php is ignored
$fullurl = $matches[1].$matches[3];
}
$matches = null;
if (preg_match('/^[^#\?]+\.([a-z0-9]+)([#\?].*)?$/i', $fullurl, $matches)) {
return strtolower($matches[1]);
}
return '';
}
/**
* Returns image embedding html.
* @param string $fullurl
* @param string $title
* @return string html
*/
function resourcelib_embed_image($fullurl, $title) {
$code = '';
$code .= '<div class="resourcecontent resourceimg">';
$code .= "<img title=\"".s(strip_tags(format_string($title)))."\" class=\"resourceimage\" src=\"$fullurl\" alt=\"\" />";
$code .= '</div>';
return $code;
}
/**
* Returns general link or pdf embedding html.
* @param string $fullurl
* @param string $title
* @param string $clicktoopen
* @return string html
*/
function resourcelib_embed_pdf($fullurl, $title, $clicktoopen) {
global $CFG, $PAGE;
$code = <<<EOT
<div class="resourcecontent resourcepdf">
<object id="resourceobject" data="$fullurl" type="application/pdf" width="800" height="600">
<param name="src" value="$fullurl" />
$clicktoopen
</object>
</div>
EOT;
// the size is hardcoded in the boject obove intentionally because it is adjusted by the following function on-the-fly
$PAGE->requires->js_init_call('M.util.init_maximised_embed', array('resourceobject'), true);
return $code;
}
/**
* Returns general link or file embedding html.
* @param string $fullurl
* @param string $title
* @param string $clicktoopen
* @param string $mimetype
* @return string html
*/
function resourcelib_embed_general($fullurl, $title, $clicktoopen, $mimetype) {
global $CFG, $PAGE;
if ($fullurl instanceof moodle_url) {
$fullurl = $fullurl->out();
}
$param = '<param name="src" value="'.$fullurl.'" />';
// Always use iframe embedding because object tag does not work much,
// this is ok in HTML5.
$code = <<<EOT
<div class="resourcecontent resourcegeneral">
<iframe id="resourceobject" src="$fullurl">
$clicktoopen
</iframe>
</div>
EOT;
// the size is hardcoded in the boject obove intentionally because it is adjusted by the following function on-the-fly
$PAGE->requires->js_init_call('M.util.init_maximised_embed', array('resourceobject'), true);
return $code;
}