GASを使ってBacklog APIを叩く

Question

前提・実現したいこと

GASを使ってBacklog APIを叩いてファイルをアップロードしたい
指定のフォルダの中のファイルを全てアップロードする関数を作成中です
multipart/form-dataがイマイチわかっていません
TypeScriptを使って変換してGASにしています

追記：
paramterLogはlogなので特に意味はないです。
BacklogAPI リファレンス

該当のソースコード

function uploadAttachment() {
    var result: any = [];
    var baseUrl = PropertiesService.getScriptProperties().getProperty('backlogBaseUrl');
    var backlogApiKey: any = PropertiesService.getScriptProperties().getProperty('backlogApiKey');
    var driveId: any = PropertiesService.getScriptProperties().getProperty('driveId');
    var files: any = DriveApp.getFolderById(driveId).getFiles();
    var url = baseUrl + '/api/v2/space/attachment?apiKey=' + backlogApiKey;
    var boundary = 'boundary';
    while(files.hasNext()) {
        var file = files.next();
        var data = file.getBlob().getDataAsString();
        var requestBody: any = Utilities.newBlob(
            '--' + boundary + "\r\n"
            + 'Content-Disposition: form-data; name="file"; filename="' + file.getName() + "\"\r\n"
            + "Content-Type: application/octet-stream \r\n\r\n"
            + '--' + boundary + "\r\n"
            + data + "\r\n"
            + '--' + boundary + "--\r\n"
        );
        var request = UrlFetchApp.fetch(url, {
            headers: {
                contentType: 'multipart/form-data; boundary='+boundary
            },
            method: 'post',
            payload: requestBody,
            muteHttpExceptions: true
        });
        var responseJson = JSON.parse(request.getContentText());
        paramterLog('uploadAttachment', 'responseJson',responseJson);
        result.push(responseJson['id']);
    }
    return result;
}

Answer 1

解決しました

function uploadAttachment() {
    var result: number[] = [];
    var baseUrl = PropertiesService.getScriptProperties().getProperty('backlogBaseUrl');
    var backlogApiKey: any = PropertiesService.getScriptProperties().getProperty('backlogApiKey');
    var driveId: any = PropertiesService.getScriptProperties().getProperty('driveId');
    var files: any = DriveApp.getFolderById(driveId).getFiles();
    var url = baseUrl + '/api/v2/space/attachment?apiKey=' + backlogApiKey;
    var boundary = 'boundary';
    while(files.hasNext()) {
        var file = files.next();
        var data = file.getBlob().getDataAsString();
        var requestBody: any = Utilities.newBlob(
            "--" + boundary + "\r\n"
            + "Content-Disposition: form-data; name=\"file\"; filename=" + file.getName() + "\r\n"
            + "Content-Type: application/octet-stream \r\n\r\n"
            + "--" + boundary + "\r\n"
            + data + "\r\n"
            + "--" + boundary + "--\r\n"
        );
        var request = UrlFetchApp.fetch(url, {
            contentType: 'multipart/form-data; boundary=' + boundary,
            method: 'post',
            payload: requestBody,
        });
        var responseJson = JSON.parse(request.getContentText());
        result.push(Number(responseJson.id));
        Utilities.sleep(1000);
    }
    return result;
}