[Axios] Multipart 파일 업로드 (with Vue.js)

프로젝트 시 Multipart로 파일과 JSON데이터를 업로드 해야하는 요구사항이 있어 제작한 모듈을 정리한다.

API 모듈 파일

export function requestMultipartJsonObject (requestObj) {
  // _.merge - Lodash 라이브러리
  let reqHeaders = store.state.api.common // 공통적으로 사용하는 헤더정보
  _.merge(reqHeaders, requestObj.headers) // 요청 시 설정한 헤더 override
  _.merge(reqHeaders, { 'enctype': 'multipart/form-data' }) // 헤더에 multipart 추가

  const formData = new FormData()

  // data JsonObject 처리
  formData.append('jsonData', JSON.stringify(requestObj.data))

  // files 처리
  // requestObj.files - (file type)HTMLInputElement 배열
  if (requestObj.files) {
    requestObj.files
      .filter((file) => file.name && file.file) // 파일선택되지 않은 Input Element제외
      .forEach((file) => formData.append(file.name, file.file))
  }

  return axios({
    url: requestObj.url,
    headers: reqHeaders,
    method: 'post',
    data: formData
  }).then(res => {
    requestObj.callback(res.data)
  }).catch(res => {
    // status 200이 아닌경우에도 응답값을 전달 (각 프로젝트에 맞게 수정필요)
    requestObj.callback(res.response.data)
  })
}

유틸파일

/**
 * input(File) Element배열을 requestApi 에서 사용하는 형식으로 반환
 * @param {Array of Input File Element} fileArray
 */
function getRequestFileArray (fileArray) {
  let reqFileArray = []

  verifyFileArray(fileArray)
    .map((fileObj) => {
      return fileObj.files
    })
    .filter((fileList) => {
      return fileList.length > 0
    })
    .forEach((fileList) => {
      Array.from(fileList).forEach((file) => {
        reqFileArray.push({
          name: file.name,
          file: file
        })
      })
    })

  return reqFileArray
}

/**
 * verify Array of Input File Element
 * @param {Array of Input File Element} fileArray
 */
function verifyFileArray (fileArray) {
  if (fileArray instanceof Array) {
    fileArray.filter((fileObj) => {
      if (fileObj.files instanceof FileList === false) {
        console.error('fileObj is not FileList', fileObj)
      }
      return fileObj.files instanceof FileList
    })
    return fileArray
  } else {
    console.error('fileArray object is not Array', fileArray)
    return []
  }
}

1004lucifer
사용파일 (vue)

requestMultipartJsonObject({
  url: this.fileUploadUrl, // required
  headers: { // required
    'CUSTOM-HEADER': 'custom-value' // required
  },
  callback: (data) => { // required
    console.log('data: ', data)
    this.$refs.resData3.innerHTML = JSON.stringify(data)
  },
  data: { // optional (전달할 JSON 데이터)
    'dummyKey': 'dummyValue'
  },
  // optional
  // 해당 input(file) Element 에 파일이 선택되지 않으면
  // 알아서 거르고 선택된 파일만 올라간다.
  files: getRequestFileArray([
    this.$refs.file1, // <input ref="file1" type="file" />
    this.$refs.file2
  ])
})

Fiddler를 이용해 위의 모듈을 사용해 JSON데이터와 파일2개를 업로드하면 아래와 같이 패킷이 서버로 전송된다.
1004lucifer

POST http://localhost:8080/UploadFile HTTP/1.1
Host: localhost:8080
Connection: keep-alive
Content-Length: 3761
Origin: http://localhost:8080
enctype: multipart/form-data
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.86 Safari/537.36
Content-Type: multipart/form-data; boundary=----WebKitFormBoundarydM2WhcM1tdaZ1o1n
Accept: application/json, text/plain, */*
Referer: http://localhost:8080/
Accept-Encoding: gzip, deflate, br
Accept-Language: ko,ja;q=0.9,ko-KR;q=0.8,en-US;q=0.7,en;q=0.6

------WebKitFormBoundarydM2WhcM1tdaZ1o1n
Content-Disposition: form-data; name="jsonData"

{"dummyKey":"dummyValue"}
------WebKitFormBoundarydM2WhcM1tdaZ1o1n
Content-Disposition: form-data; name="form-check-sign.png"; filename="form-check-sign.png"
Content-Type: image/png

 PNG
 
   
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------WebKitFormBoundarydM2WhcM1tdaZ1o1n
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Content-Type: image/png

 PNG
 
   
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------WebKitFormBoundarydM2WhcM1tdaZ1o1n--

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[Axios] Multipart 파일 업로드 (with Vue.js)

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