fsGetFilesWithHashInFolderCore.mjs

import get from 'lodash-es/get.js'
import pmSeries from './pmSeries.mjs'
import isestr from './isestr.mjs'
import fsIsFolderCore from './fsIsFolderCore.mjs'
import fsGetFilesInFolderCore from './fsGetFilesInFolderCore.mjs'
import fsGetFileHashCore from './fsGetFileHashCore.mjs'
import errToStr from './_errToStr.mjs'


/**
 * 後端nodejs列舉指定資料夾下的全部檔案與對應HASH值
 *
 * Unit Test: {@link https://github.com/yuda-lyu/wsemi/blob/master/test/fsGetFilesWithHashInFolderCore.test.mjs Github}
 * @memberOf wsemi
 * @param {String} fd 輸入欲列舉的資料夾字串
 * @param {Integer} [levelLimit=1] 輸入列舉層數限制正整數，設定1為列舉資料夾下第一層的檔案，設定null為無窮遍歷所有檔案，預設1
 * @param {Object} [opt={}] 輸入設定物件，預設{}
 * @param {String} [opt.type='md5'] 輸入計算HASH方法字串，預設'md5'
 * @returns {Promise} 回傳Promise，resolve回傳列舉檔案陣列，reject回傳錯誤訊息字串
 * @example
 * //need test in nodejs
 *
 * //see fsGetFilesWithHashInFolder
 *
 */
async function fsGetFilesWithHashInFolderCore(fd, levelLimit = 1, opt = {}) {
    try {

        //path, fs, crypto, 讀取opt置於try內: opt本身或其屬性不可讀(getter拋錯、已撤銷之Proxy)時get拋出, 於async函數內未捕捉即以Error物件reject
        let path = get(opt, 'path')
        let fs = get(opt, 'fs')
        let crypto = get(opt, 'crypto')

        //type
        let type = get(opt, 'type', '')
        if (!isestr(type)) {
            type = 'md5'
        }

        //check
        if (!fsIsFolderCore(fd, { fs })) {
            return Promise.reject(`fd[${fd}] is not a folder`)
        }

        //fps
        let fps = fsGetFilesInFolderCore(fd, levelLimit, { path, fs })

        //add hash
        fps = await pmSeries(fps, async (v) => {

            //ph
            let ph = get(v, 'path', '')

            //hash
            v.hashType = type
            v.hash = ''
            if (isestr(ph)) {
                v.hash = await fsGetFileHashCore(ph, {
                    fs,
                    crypto,
                    type,
                    useSync: false, //使用非同步才能支援大檔
                })
            }

            return v
        })

        return fps
    }
    catch (err) {
        //fsGetFilesInFolderCore之readdirSync(EPERM等)Error、注入之fs拋出之任意值, 一律轉字串; 已為字串者(fsGetFileHashCore之reject)原樣
        return Promise.reject(errToStr(err))
    }
}


export default fsGetFilesWithHashInFolderCore