PHP FileManager::add_ext_on_mime方法代码示例

 /**
  * @param int $eventId
  * @param array $settings = array('comment' => $comment, 'file' => $file
  * @return bool
  */
 private function addAttachment($eventId, $settings)
 {
     $table = Database::get_course_table(TABLE_AGENDA_ATTACHMENT);
     if (!isset($settings['file'])) {
         return false;
     }
     $file = $settings['file'];
     if (!empty($file['name'])) {
         $upload_ok = FileManager::process_uploaded_file($file);
     }
     $_course = api_get_course_info();
     if (!empty($upload_ok)) {
         $courseDir = $_course['path'] . '/upload/calendar';
         $sys_course_path = api_get_path(SYS_COURSE_PATH);
         $updir = $sys_course_path . $courseDir;
         // Try to add an extension to the file if it hasn't one
         $new_file_name = FileManager::add_ext_on_mime(stripslashes($_FILES['user_upload']['name']), $_FILES['user_upload']['type']);
         // user's file name
         $file_name = $_FILES['user_upload']['name'];
         if (!FileManager::filter_extension($new_file_name)) {
             Display::display_error_message(get_lang('UplUnableToSaveFileFilteredExtension'));
         } else {
             $new_file_name = uniqid('');
             $new_path = $updir . '/' . $new_file_name;
             $result = move_uploaded_file($file['tmp_name'], $new_path);
             $safe_file_comment = Database::escape_string($settings['comment']);
             $safe_file_name = Database::escape_string($file_name);
             $safe_new_file_name = Database::escape_string($new_file_name);
             $course_id = api_get_course_int_id();
             // Storing the attachments if any
             if ($result) {
                 $sql = 'INSERT INTO ' . $table . '(c_id, filename,comment, path,agenda_id,size) ' . "VALUES ({$course_id},  '" . $safe_file_name . "', '" . $safe_file_comment . "', '" . $safe_new_file_name . "' , '" . $eventId . "', '" . intval($file['size']) . "' )";
                 Database::query($sql);
                 $last_id_file = Database::insert_id();
                 api_item_property_update($_course, 'calendar_event_attachment', $last_id_file, 'AgendaAttachmentAdded', api_get_user_id());
             }
         }
     }
 }

 /**
  * Uploads an author image to the upload/learning_path/images directory
  * @param    array    The image array, coming from the $_FILES superglobal
  * @return    boolean    True on success, false on error
  */
 public function upload_image($image_array)
 {
     $image_moved = false;
     if (!empty($image_array['name'])) {
         $upload_ok = FileManager::process_uploaded_file($image_array);
         $has_attachment = true;
     } else {
         $image_moved = true;
     }
     if ($upload_ok) {
         if ($has_attachment) {
             $courseDir = api_get_course_path() . '/upload/learning_path/images';
             $sys_course_path = api_get_path(SYS_COURSE_PATH);
             $updir = $sys_course_path . $courseDir;
             // Try to add an extension to the file if it hasn't one.
             $new_file_name = FileManager::add_ext_on_mime(stripslashes($image_array['name']), $image_array['type']);
             if (!FileManager::filter_extension($new_file_name)) {
                 //Display :: display_error_message(get_lang('UplUnableToSaveFileFilteredExtension'));
                 $image_moved = false;
             } else {
                 $file_extension = explode('.', $image_array['name']);
                 $file_extension = strtolower($file_extension[sizeof($file_extension) - 1]);
                 $filename = uniqid('');
                 $new_file_name = $filename . '.' . $file_extension;
                 $new_path = $updir . '/' . $new_file_name;
                 // Resize the image.
                 $temp = new Image($image_array['tmp_name']);
                 $picture_infos = $temp->get_image_info();
                 if ($picture_infos['width'] > 104) {
                     $thumbwidth = 104;
                 } else {
                     $thumbwidth = $picture_infos['width'];
                 }
                 if ($picture_infos['height'] > 96) {
                     $new_height = 96;
                 } else {
                     $new_height = $picture_infos['height'];
                 }
                 $temp->resize($thumbwidth, $new_height, 0);
                 $result = $temp->send_image($new_path);
                 // Storing the image filename.
                 if ($result) {
                     $image_moved = true;
                     $this->set_preview_image($new_file_name);
                     //Resize to 64px to use on course homepage
                     $temp->resize(64, 64, 0);
                     $temp->send_image($updir . '/' . $filename . '.64.' . $file_extension);
                     return true;
                 }
             }
         }
     }
     return false;
 }

     Display::display_normal_message($template_text, false);
 } elseif (isset($_GET['add_as_template']) && isset($_POST['create_template'])) {
     $document_id_for_template = intval(Database::escape_string($_GET['add_as_template']));
     $title = Security::remove_XSS($_POST['template_title']);
     //$description = Security::remove_XSS($_POST['template_description']);
     $user_id = api_get_user_id();
     // Create the template_thumbnails folder in the upload folder (if needed)
     if (!is_dir(api_get_path(SYS_DATA_PATH) . 'courses/' . $_course['path'] . '/upload/template_thumbnails/')) {
         @mkdir(api_get_path(SYS_DATA_PATH) . 'courses/' . $_course['path'] . '/upload/template_thumbnails/', api_get_permissions_for_new_directories());
     }
     // Upload the file
     if (!empty($_FILES['template_image']['name'])) {
         $upload_ok = FileManager::process_uploaded_file($_FILES['template_image']);
         if ($upload_ok) {
             // Try to add an extension to the file if it hasn't one
             $new_file_name = $_course['sysCode'] . '-' . FileManager::add_ext_on_mime(stripslashes($_FILES['template_image']['name']), $_FILES['template_image']['type']);
             // Upload dir
             $upload_dir = api_get_path(SYS_DATA_PATH) . 'courses/' . $_course['path'] . '/upload/template_thumbnails/';
             // Resize image to max default and end upload
             $temp = new Image($_FILES['template_image']['tmp_name']);
             $picture_info = $temp->get_image_info();
             $max_width_for_picture = 100;
             if ($picture_info['width'] > $max_width_for_picture) {
                 $thumbwidth = $max_width_for_picture;
                 if (empty($thumbwidth) || $thumbwidth == 0) {
                     $thumbwidth = $max_width_for_picture;
                 }
                 $new_height = round($thumbwidth / $picture_info['width'] * $picture_info['height']);
                 $temp->resize($thumbwidth, $new_height, 0);
             }
             $temp->send_image($upload_dir . $new_file_name);

 /**
  * Uploads the nanogong wav file
  * @param bool
  */
 public function upload_file($is_nano = false)
 {
     if (!empty($_FILES)) {
         $upload_ok = FileManager::process_uploaded_file($_FILES['file'], false);
         if (!is_uploaded_file($_FILES['file']['tmp_name'])) {
             return 0;
         }
         if ($upload_ok) {
             // Check if there is enough space to save the file
             if (!DocumentManager::enough_space($_FILES['file']['size'], DocumentManager::get_course_quota())) {
                 return 0;
             }
             //first we delete everything before uploading the file
             $this->delete_files();
             //Reload the filename variable
             $file_name = FileManager::add_ext_on_mime($_FILES['file']['name'], $_FILES['file']['type']);
             $file_name = strtolower($file_name);
             $file_info = pathinfo($file_name);
             if ($is_nano == true) {
                 $file_info['extension'] = 'wav';
             }
             $file_name = $this->filename . '.' . $file_info['extension'];
             if (in_array($file_info['extension'], $this->available_extensions)) {
                 if (move_uploaded_file($_FILES['file']['tmp_name'], $this->store_path . $file_name)) {
                     $this->store_filename = $this->store_path . $file_name;
                     return 1;
                 }
             }
         }
     }
     return 0;
 }

/**
 * @return array|null|string
 */
function store_add_dropbox()
{
    $_course = api_get_course_info();
    $_user = api_get_user_info();
    $dropbox_cnf = getDropboxConf();
    // Validating the form data
    // there are no recipients selected
    if (!isset($_POST['recipients']) || count($_POST['recipients']) <= 0) {
        return get_lang('YouMustSelectAtLeastOneDestinee');
    } else {
        // Check if all the recipients are valid
        $thisIsAMailing = false;
        $thisIsJustUpload = false;
        foreach ($_POST['recipients'] as $rec) {
            if ($rec == 'mailing') {
                $thisIsAMailing = true;
            } elseif ($rec == 'upload') {
                $thisIsJustUpload = true;
            } elseif (strpos($rec, 'user_') === 0 && !isCourseMember(substr($rec, strlen('user_')))) {
                return get_lang('InvalideUserDetected');
            } elseif (strpos($rec, 'group_') !== 0 && strpos($rec, 'user_') !== 0) {
                return get_lang('InvalideGroupDetected');
            }
        }
    }
    // we are doing a mailing but an additional recipient is selected
    if ($thisIsAMailing && count($_POST['recipients']) != 1) {
        return get_lang('MailingSelectNoOther');
    }
    // we are doing a just upload but an additional recipient is selected.
    // note: why can't this be valid? It is like sending a document to yourself AND to a different person (I do this quite often with my e-mails)
    if ($thisIsJustUpload && count($_POST['recipients']) != 1) {
        return get_lang('MailingJustUploadSelectNoOther');
    }
    if (empty($_FILES['file']['name'])) {
        $error = true;
        return get_lang('NoFileSpecified');
    }
    // are we overwriting a previous file or sending a new one
    $dropbox_overwrite = false;
    if (isset($_POST['cb_overwrite']) && $_POST['cb_overwrite']) {
        $dropbox_overwrite = true;
    }
    // doing the upload
    $dropbox_filename = $_FILES['file']['name'];
    $dropbox_filesize = $_FILES['file']['size'];
    $dropbox_filetype = $_FILES['file']['type'];
    $dropbox_filetmpname = $_FILES['file']['tmp_name'];
    // check if the filesize does not exceed the allowed size.
    if ($dropbox_filesize <= 0 || $dropbox_filesize > $dropbox_cnf['maxFilesize']) {
        return get_lang('DropboxFileTooBig');
        // TODO: The "too big" message does not fit in the case of uploading zero-sized file.
    }
    // check if the file is actually uploaded
    if (!is_uploaded_file($dropbox_filetmpname)) {
        // check user fraud : no clean error msg.
        return get_lang('TheFileIsNotUploaded');
    }
    $upload_ok = FileManager::process_uploaded_file($_FILES['file'], true);
    if (!$upload_ok) {
        return null;
    }
    // Try to add an extension to the file if it hasn't got one
    $dropbox_filename = FileManager::add_ext_on_mime($dropbox_filename, $dropbox_filetype);
    // Replace dangerous characters
    $dropbox_filename = api_replace_dangerous_char($dropbox_filename);
    // Transform any .php file in .phps fo security
    $dropbox_filename = FileManager::php2phps($dropbox_filename);
    //filter extension
    if (!FileManager::filter_extension($dropbox_filename)) {
        return get_lang('UplUnableToSaveFileFilteredExtension');
    }
    // set title
    $dropbox_title = $dropbox_filename;
    // set author
    if (!isset($_POST['authors'])) {
        $_POST['authors'] = getUserNameFromId($_user['user_id']);
    }
    // note: I think we could better migrate everything from here on to separate functions: store_new_dropbox, store_new_mailing, store_just_upload
    if ($dropbox_overwrite) {
        $dropbox_person = new Dropbox_Person($_user['user_id'], api_is_course_admin(), api_is_course_tutor());
        foreach ($dropbox_person->sentWork as $w) {
            if ($w->title == $dropbox_filename) {
                if ($w->recipients[0]['id'] > dropbox_cnf('mailingIdBase') xor $thisIsAMailing) {
                    return get_lang('MailingNonMailingError');
                }
                if ($w->recipients[0]['id'] == $_user['user_id'] xor $thisIsJustUpload) {
                    return get_lang('MailingJustUploadSelectNoOther');
                }
                $dropbox_filename = $w->filename;
                $found = true;
                // note: do we still need this?
                break;
            }
        }
    } else {
        // rename file to login_filename_uniqueId format
//.........这里部分代码省略.........

/**
 * Add (or edit) a template. This function displays the form and also takes care of uploading the image and storing the information in the database
 *
 * @author Patrick Cool <patrick.cool@UGent.be>, Ghent University, Belgium
 * @version August 2008
 * @since Dokeos 1.8.6
 */
function add_edit_template()
{
    // Initialize the object.
    $form = new FormValidator('template', 'post', 'settings.php?category=Templates&action=' . Security::remove_XSS($_GET['action']) . '&id=' . Security::remove_XSS($_GET['id']));
    // Settting the form elements: the header.
    if ($_GET['action'] == 'add') {
        $title = get_lang('AddTemplate');
    } else {
        $title = get_lang('EditTemplate');
    }
    $form->addElement('header', $title);
    // Settting the form elements: the title of the template.
    $form->add_textfield('title', get_lang('Title'), false);
    // Settting the form elements: the content of the template (wysiwyg editor).
    $form->addElement('html_editor', 'template_text', get_lang('Text'), null, array('ToolbarSet' => 'AdminTemplates', 'Width' => '100%', 'Height' => '400'));
    // Settting the form elements: the form to upload an image to be used with the template.
    $form->addElement('file', 'template_image', get_lang('Image'), '');
    // Settting the form elements: a little bit information about the template image.
    $form->addElement('static', 'file_comment', '', get_lang('TemplateImageComment100x70'));
    // Getting all the information of the template when editing a template.
    if ($_GET['action'] == 'edit') {
        // Database table definition.
        $table_system_template = Database::get_main_table('system_template');
        $sql = "SELECT * FROM {$table_system_template} WHERE id = '" . Database::escape_string($_GET['id']) . "'";
        $result = Database::query($sql);
        $row = Database::fetch_array($result);
        $defaults['template_id'] = intval($_GET['id']);
        $defaults['template_text'] = $row['content'];
        // Forcing get_lang().
        $defaults['title'] = get_lang($row['title']);
        // Adding an extra field: a hidden field with the id of the template we are editing.
        $form->addElement('hidden', 'template_id');
        // Adding an extra field: a preview of the image that is currently used.
        if (!empty($row['image'])) {
            $form->addElement('static', 'template_image_preview', '', '<img src="' . api_get_path(WEB_DATA_PATH) . 'document_templates/' . $row['image'] . '" alt="' . get_lang('TemplatePreview') . '"/>');
        } else {
            $form->addElement('static', 'template_image_preview', '', '<img src="' . api_get_path(WEB_DATA_PATH) . 'document_templates/noimage.gif" alt="' . get_lang('NoTemplatePreview') . '"/>');
        }
        // Setting the information of the template that we are editing.
        $form->setDefaults($defaults);
    }
    // Setting the form elements: the submit button.
    $form->addElement('style_submit_button', 'submit', get_lang('Ok'), 'class="save"');
    // Setting the rules: the required fields.
    $form->addRule('title', get_lang('ThisFieldIsRequired'), 'required');
    $form->addRule('template_text', get_lang('ThisFieldIsRequired'), 'required');
    // if the form validates (complies to all rules) we save the information, else we display the form again (with error message if needed)
    if ($form->validate()) {
        $check = Security::check_token('post');
        if ($check) {
            // Exporting the values.
            $values = $form->exportValues();
            // Upload the file.
            if (!empty($_FILES['template_image']['name'])) {
                $upload_ok = FileManager::process_uploaded_file($_FILES['template_image']);
                if ($upload_ok) {
                    // Try to add an extension to the file if it hasn't one.
                    $new_file_name = FileManager::add_ext_on_mime(stripslashes($_FILES['template_image']['name']), $_FILES['template_image']['type']);
                    // The upload directory.
                    $upload_dir = api_get_path(SYS_DATA_PATH) . 'document_templates/';
                    // Resize the preview image to max default and upload.
                    $temp = new Image($_FILES['template_image']['tmp_name']);
                    $picture_info = $temp->get_image_info();
                    $max_width_for_picture = 100;
                    if ($picture_info['width'] > $max_width_for_picture) {
                        $thumbwidth = $max_width_for_picture;
                        if (empty($thumbwidth) || $thumbwidth == 0) {
                            $thumbwidth = $max_width_for_picture;
                        }
                        $new_height = round($thumbwidth / $picture_info['width'] * $picture_info['height']);
                        $temp->resize($thumbwidth, $new_height, 0);
                    }
                    $temp->send_image($upload_dir . $new_file_name);
                }
            }
            // Store the information in the database (as insert or as update).
            $table_system_template = Database::get_main_table('system_template');
            if ($_GET['action'] == 'add') {
                $content_template = '<head>{CSS}<style type="text/css">.text{font-weight: normal;}</style></head><body>' . Database::escape_string($values['template_text']) . '</body>';
                $sql = "INSERT INTO {$table_system_template} (title, content, image) VALUES ('" . Database::escape_string($values['title']) . "','" . $content_template . "','" . Database::escape_string($new_file_name) . "')";
                Database::query($sql);
                // Display a feedback message.
                Display::display_confirmation_message(get_lang('TemplateAdded'));
                echo '<a href="settings.php?category=Templates&amp;action=add">' . Display::return_icon('new_template.png', get_lang('AddTemplate'), '', ICON_SIZE_MEDIUM) . '</a>';
            } else {
                $content_template = '<head>{CSS}<style type="text/css">.text{font-weight: normal;}</style></head><body>' . Database::escape_string($values['template_text']) . '</body>';
                $sql = "UPDATE {$table_system_template} set title = '" . Database::escape_string($values['title']) . "', content = '" . $content_template . "'";
                if (!empty($new_file_name)) {
                    $sql .= ", image = '" . Database::escape_string($new_file_name) . "'";
                }
                $sql .= " WHERE id='" . Database::escape_string($_GET['id']) . "'";
                Database::query($sql);
                // Display a feedback message.
//.........这里部分代码省略.........

 /**
  * Creates a comment on a post in a given blog
  * @author Toon Keppens
  * @param String $title
  * @param String $full_text
  * @param Integer $blog_id
  * @param Integer $post_id
  * @param Integer $parent_id
  */
 public static function create_comment($title, $full_text, $file_comment, $blog_id, $post_id, $parent_id, $task_id = 'NULL')
 {
     $_course = api_get_course_info();
     $userId = api_get_user_id();
     global $blog_table_attachment;
     $upload_ok = true;
     $has_attachment = false;
     $current_date = date('Y-m-d H:i:s', time());
     $course_id = api_get_course_int_id();
     if (!empty($_FILES['user_upload']['name'])) {
         $upload_ok = FileManager::process_uploaded_file($_FILES['user_upload']);
         $has_attachment = true;
     }
     if ($upload_ok) {
         // Table Definition
         $tbl_blogs_comments = Database::get_course_table(TABLE_BLOGS_COMMENTS);
         // Create the comment
         $sql = "INSERT INTO {$tbl_blogs_comments} (c_id, title, comment, author_id, date_creation, blog_id, post_id, parent_comment_id, task_id )\n\t\t\t\t\tVALUES ({$course_id}, '" . Database::escape_string($title) . "', '" . Database::escape_string($full_text) . "', '" . $userId . "','" . $current_date . "', '" . (int) $blog_id . "', '" . (int) $post_id . "', '" . (int) $parent_id . "', '" . (int) $task_id . "')";
         Database::query($sql);
         // Empty post values, or they are shown on the page again
         $_POST['comment_title'] = "";
         $_POST['comment_text'] = "";
         $last_id = Database::insert_id();
         if ($has_attachment) {
             $courseDir = $_course['path'] . '/upload/blog';
             $sys_course_path = api_get_path(SYS_COURSE_PATH);
             $updir = $sys_course_path . $courseDir;
             // Try to add an extension to the file if it hasn't one
             $new_file_name = FileManager::add_ext_on_mime(stripslashes($_FILES['user_upload']['name']), $_FILES['user_upload']['type']);
             // user's file name
             $file_name = $_FILES['user_upload']['name'];
             if (!FileManager::filter_extension($new_file_name)) {
                 Display::display_error_message(get_lang('UplUnableToSaveFileFilteredExtension'));
             } else {
                 $new_file_name = uniqid('');
                 $new_path = $updir . '/' . $new_file_name;
                 $result = @move_uploaded_file($_FILES['user_upload']['tmp_name'], $new_path);
                 $comment = Database::escape_string($file_comment);
                 // Storing the attachments if any
                 if ($result) {
                     $sql = 'INSERT INTO ' . $blog_table_attachment . '(c_id, filename,comment, path, post_id,size,blog_id,comment_id) ' . "VALUES ({$course_id}, '" . Database::escape_string($file_name) . "', '" . Database::escape_string($comment) . "', '" . Database::escape_string($new_file_name) . "' , '" . $post_id . "', '" . $_FILES['user_upload']['size'] . "',  '" . $blog_id . "', '" . $last_id . "'  )";
                     $result = Database::query($sql);
                     $message .= ' / ' . get_lang('AttachmentUpload');
                 }
             }
         }
     }
 }

 if (substr($key, 0, 7) == 'mp3file' and !empty($_FILES[$key]['tmp_name'])) {
     // The id of the learning path item.
     $lp_item_id = str_ireplace('mp3file', '', $key);
     // Create the audio folder if it does not exist yet.
     $_course = api_get_course_info();
     $filepath = api_get_path(SYS_COURSE_PATH) . $_course['path'] . '/document/';
     if (!is_dir($filepath . 'audio')) {
         mkdir($filepath . 'audio', api_get_permissions_for_new_directories());
         $audio_id = FileManager::add_document($_course, '/audio', 'folder', 0, 'audio');
         api_item_property_update($_course, TOOL_DOCUMENT, $audio_id, 'FolderCreated', api_get_user_id(), null, null, null, null, api_get_session_id());
     }
     // Check if file already exits into document/audio/
     $file_name = $_FILES[$key]['name'];
     $file_name = stripslashes($file_name);
     // Add extension to files without one (if possible).
     $file_name = FileManager::add_ext_on_mime($file_name, $_FILES[$key]['type']);
     $clean_name = api_replace_dangerous_char($file_name);
     // No "dangerous" files.
     $clean_name = FileManager::disable_dangerous_file($clean_name);
     $check_file_path = api_get_path(SYS_COURSE_PATH) . $_course['path'] . '/document/audio/' . $clean_name;
     // If the file exists we generate a new name.
     if (file_exists($check_file_path)) {
         $filename_components = explode('.', $clean_name);
         // Gettting the extension of the file.
         $file_extension = $filename_components[count($filename_components) - 1];
         // Adding something random to prevent overwriting.
         $filename_components[count($filename_components) - 1] = time();
         // Reconstructing the new filename.
         $clean_name = implode($filename_components) . '.' . $file_extension;
         // Using the new name in the $_FILES superglobal.
         $_FILES[$key]['name'] = $clean_name;

/**
 * This function edits an attachment file into a forum
 * @param string  a comment about file
 * @param int Post Id
 * @param int attachment file Id
 * @return void
 */
function edit_forum_attachment_file($file_comment, $post_id, $id_attach)
{
    $_course = api_get_course_info();
    $table_forum_attachment = Database::get_course_table(TABLE_FORUM_ATTACHMENT);
    $course_id = api_get_course_int_id();
    // Storing the attachments.
    if (!empty($_FILES['user_upload']['name'])) {
        $upload_ok = FileManager::process_uploaded_file($_FILES['user_upload']);
    }
    if (!empty($upload_ok)) {
        $course_dir = $_course['path'] . '/upload/forum';
        $sys_course_path = api_get_path(SYS_COURSE_PATH);
        $updir = $sys_course_path . $course_dir;
        // Try to add an extension to the file if it hasn't one.
        $new_file_name = FileManager::add_ext_on_mime(stripslashes($_FILES['user_upload']['name']), $_FILES['user_upload']['type']);
        // User's file name
        $file_name = $_FILES['user_upload']['name'];
        if (!FileManager::filter_extension($new_file_name)) {
            Display::display_error_message(get_lang('UplUnableToSaveFileFilteredExtension'));
        } else {
            $new_file_name = uniqid('');
            $new_path = $updir . '/' . $new_file_name;
            $result = @move_uploaded_file($_FILES['user_upload']['tmp_name'], $new_path);
            $safe_file_comment = Database::escape_string($file_comment);
            $safe_file_name = Database::escape_string($file_name);
            $safe_new_file_name = Database::escape_string($new_file_name);
            $safe_post_id = (int) $post_id;
            $safe_id_attach = (int) $id_attach;
            // Storing the attachments if any.
            if ($result) {
                $sql = "UPDATE {$table_forum_attachment} SET filename = '{$safe_file_name}', comment = '{$safe_file_comment}', path = '{$safe_new_file_name}', post_id = '{$safe_post_id}', size ='" . $_FILES['user_upload']['size'] . "'\n                       WHERE c_id = {$course_id} AND id = '{$safe_id_attach}'";
                $result = Database::query($sql);
                api_item_property_update($_course, TOOL_FORUM_ATTACH, $safe_id_attach, 'ForumAttachmentUpdated', api_get_user_id());
            }
        }
    }
}

 /**
  * This function edit a attachment file into announcement
  * @param int attach id
  * @param array uploaded file $_FILES
  * @param string file comment
  * @return int
  */
 public static function edit_announcement_attachment_file($id_attach, $file, $file_comment)
 {
     $_course = api_get_course_info();
     $tbl_announcement_attachment = Database::get_course_table(TABLE_ANNOUNCEMENT_ATTACHMENT);
     $return = 0;
     $course_id = api_get_course_int_id();
     if (is_array($file) && $file['error'] == 0) {
         $courseDir = $_course['path'] . '/upload/announcements';
         // TODO: This path is obsolete. The new document repository scheme should be kept in mind here.
         $sys_course_path = api_get_path(SYS_COURSE_PATH);
         $updir = $sys_course_path . $courseDir;
         // Try to add an extension to the file if it hasn't one
         $new_file_name = FileManager::add_ext_on_mime(stripslashes($file['name']), $file['type']);
         // user's file name
         $file_name = $file['name'];
         if (!FileManager::filter_extension($new_file_name)) {
             $return - 1;
             Display::display_error_message(get_lang('UplUnableToSaveFileFilteredExtension'));
         } else {
             $new_file_name = uniqid('');
             $new_path = $updir . '/' . $new_file_name;
             $result = @move_uploaded_file($file['tmp_name'], $new_path);
             $safe_file_comment = Database::escape_string($file_comment);
             $safe_file_name = Database::escape_string($file_name);
             $safe_new_file_name = Database::escape_string($new_file_name);
             $id_attach = intval($id_attach);
             $sql = "UPDATE {$tbl_announcement_attachment} SET filename = '{$safe_file_name}', comment = '{$safe_file_comment}', path = '{$safe_new_file_name}', size ='" . intval($file['size']) . "'\n\t\t\t\t\t \tWHERE c_id = {$course_id} AND id = '{$id_attach}'";
             $result = Database::query($sql);
             if ($result === false) {
                 $return = -1;
                 Display::display_error_message(get_lang('UplUnableToSaveFile'));
             } else {
                 $return = 1;
             }
         }
     }
     return $return;
 }

 /**
  * Saves a message attachment files
  * @param  array     $_FILES['name']
  * @param  string      a comment about the uploaded file
  * @param  int        message id
  * @param  int        receiver user id (optional)
  * @param  int        sender user id (optional)
  * @param  int        group id (optional)
  * @return void
  */
 public static function save_message_attachment_file($file_attach, $file_comment, $message_id, $receiver_user_id = 0, $sender_user_id = 0, $group_id = 0)
 {
     $tbl_message_attach = Database::get_main_table(TABLE_MESSAGE_ATTACHMENT);
     // Try to add an extension to the file if it hasn't one
     $new_file_name = FileManager::add_ext_on_mime(stripslashes($file_attach['name']), $file_attach['type']);
     // user's file name
     $file_name = $file_attach['name'];
     if (!FileManager::filter_extension($new_file_name)) {
         Display::display_error_message(get_lang('UplUnableToSaveFileFilteredExtension'));
     } else {
         $new_file_name = uniqid('');
         $usergroup = new UserGroup();
         if (!empty($receiver_user_id)) {
             $message_user_id = $receiver_user_id;
         } else {
             $message_user_id = $sender_user_id;
         }
         // User-reserved directory where photos have to be placed.
         if (!empty($group_id)) {
             $path_user_info = $usergroup->get_group_picture_path_by_id($group_id, 'system', true);
         } else {
             $path_user_info = UserManager::get_user_picture_path_by_id($message_user_id, 'system', true);
         }
         $path_message_attach = $path_user_info['dir'] . 'message_attachments/';
         // If this directory does not exist - we create it.
         if (!file_exists($path_message_attach)) {
             mkdir($path_message_attach, api_get_permissions_for_new_directories(), true);
         }
         $new_path = $path_message_attach . $new_file_name;
         if (is_uploaded_file($file_attach['tmp_name'])) {
             copy($file_attach['tmp_name'], $new_path);
         }
         $safe_file_comment = Database::escape_string($file_comment);
         $safe_file_name = Database::escape_string($file_name);
         $safe_new_file_name = Database::escape_string($new_file_name);
         // Storing the attachments if any
         $sql = "INSERT INTO {$tbl_message_attach}(filename,comment, path,message_id,size)\n\t\t\t\t  VALUES ( '{$safe_file_name}', '{$safe_file_comment}', '{$safe_new_file_name}' , '{$message_id}', '" . $file_attach['size'] . "' )";
         Database::query($sql);
     }
 }