PHP stdClass::get_parent_context方法代码示例

/**
 * Form for editing Information Spot  block instances.
 *
 * @copyright 2014 Roberto Pinna
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 * @package   block_informationspot
 * @category  files
 * @param stdClass $course course object
 * @param stdClass $birecord_or_cm block instance record
 * @param stdClass $context context object
 * @param string $filearea file area
 * @param array $args extra arguments
 * @param bool $forcedownload whether or not force download
 * @param array $options additional options affecting the file serving
 * @return bool
 */
function block_informationspot_pluginfile($course, $birecord_or_cm, $context, $filearea, $args, $forcedownload, array $options = array())
{
    global $DB, $CFG, $USER;
    if ($context->contextlevel != CONTEXT_BLOCK) {
        send_file_not_found();
    }
    // If block is in course context, then check if user has capability to access course.
    if ($context->get_course_context(false)) {
        require_course_login($course);
    } else {
        if ($CFG->forcelogin) {
            require_login();
        } else {
            // Get parent context and see if user have proper permission.
            $parentcontext = $context->get_parent_context();
            if ($parentcontext->contextlevel === CONTEXT_COURSECAT) {
                // Check if category is visible and user can view this category.
                $category = $DB->get_record('course_categories', array('id' => $parentcontext->instanceid), '*', MUST_EXIST);
                if (!$category->visible) {
                    require_capability('moodle/category:viewhiddencategories', $parentcontext);
                }
            } else {
                if ($parentcontext->contextlevel === CONTEXT_USER && $parentcontext->instanceid != $USER->id) {
                    // The block is in the context of a user, it is only visible to the user who it belongs to.
                    send_file_not_found();
                }
            }
            // At this point there is no way to check SYSTEM context, so ignoring it.
        }
    }
    if ($filearea != 'image') {
        send_file_not_found();
    }
    $fs = get_file_storage();
    $imageid = array_shift($args);
    $filename = array_pop($args);
    $filepath = $args ? '/' . implode('/', $args) . '/' : '/';
    if (!($file = $fs->get_file($context->id, 'block_informationspot', $filearea, $imageid, $filepath, $filename)) or $file->is_directory()) {
        send_file_not_found();
    }
    if ($parentcontext = context::instance_by_id($birecord_or_cm->parentcontextid, IGNORE_MISSING)) {
        if ($parentcontext->contextlevel == CONTEXT_USER) {
            // force download on all personal pages including /my/
            //because we do not have reliable way to find out from where this is used
            $forcedownload = true;
        }
    } else {
        // weird, there should be parent context, better force dowload then
        $forcedownload = true;
    }
    // NOTE: it woudl be nice to have file revisions here, for now rely on standard file lifetime,
    //       do not lower it because the files are dispalyed very often.
    \core\session\manager::write_close();
    send_stored_file($file, null, 0, $forcedownload, $options);
}

/**
 * Form for editing HTML block instances.
 *
 * @copyright 2010 Petr Skoda (http://skodak.org)
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 * @package   block_html
 * @category  files
 * @param stdClass $course course object
 * @param stdClass $birecord_or_cm block instance record
 * @param stdClass $context context object
 * @param string $filearea file area
 * @param array $args extra arguments
 * @param bool $forcedownload whether or not force download
 * @param array $options additional options affecting the file serving
 * @return bool
 * @todo MDL-36050 improve capability check on stick blocks, so we can check user capability before sending images.
 */
function block_html_pluginfile($course, $birecord_or_cm, $context, $filearea, $args, $forcedownload, array $options = array())
{
    global $DB, $CFG;
    if ($context->contextlevel != CONTEXT_BLOCK) {
        send_file_not_found();
    }
    // If block is in course context, then check if user has capability to access course.
    if ($context->get_course_context(false)) {
        require_course_login($course);
    } else {
        if ($CFG->forcelogin) {
            require_login();
        } else {
            // Get parent context and see if user have proper permission.
            $parentcontext = $context->get_parent_context();
            if ($parentcontext->contextlevel === CONTEXT_COURSECAT) {
                // Check if category is visible and user can view this category.
                $category = $DB->get_record('course_categories', array('id' => $parentcontext->instanceid), '*', MUST_EXIST);
                if (!$category->visible) {
                    require_capability('moodle/category:viewhiddencategories', $parentcontext);
                }
            }
            // At this point there is no way to check SYSTEM or USER context, so ignoring it.
        }
    }
    if ($filearea !== 'content') {
        send_file_not_found();
    }
    $fs = get_file_storage();
    $filename = array_pop($args);
    $filepath = $args ? '/' . implode('/', $args) . '/' : '/';
    if (!($file = $fs->get_file($context->id, 'block_html', 'content', 0, $filepath, $filename)) or $file->is_directory()) {
        send_file_not_found();
    }
    if ($parentcontext = get_context_instance_by_id($birecord_or_cm->parentcontextid)) {
        if ($parentcontext->contextlevel == CONTEXT_USER) {
            // force download on all personal pages including /my/
            //because we do not have reliable way to find out from where this is used
            $forcedownload = true;
        }
    } else {
        // weird, there should be parent context, better force dowload then
        $forcedownload = true;
    }
    session_get_instance()->write_close();
    send_stored_file($file, 60 * 60, 0, $forcedownload, $options);
}