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Viewing file:     file-appender.js (1.63 KB)      -rw-r--r--

var objectAssign = require('object-assign')

function arrayRemove (arr, item) {
  var idx = arr.indexOf(item)
  if (~idx) arr.splice(idx, 1)
}

function FileAppender (strategy, req) {
  this.strategy = strategy
  this.req = req

  switch (strategy) {
    case 'NONE': break
    case 'VALUE': break
    case 'ARRAY': req.files = []; break
    case 'OBJECT': req.files = Object.create(null); break
    default: throw new Error('Unknown file strategy: ' + strategy)
  }
}

FileAppender.prototype.insertPlaceholder = function (file) {
  var placeholder = {
    fieldname: file.fieldname
  }

  switch (this.strategy) {
    case 'NONE': break
    case 'VALUE': break
    case 'ARRAY': this.req.files.push(placeholder); break
    case 'OBJECT':
      if (this.req.files[file.fieldname]) {
        this.req.files[file.fieldname].push(placeholder)
      } else {
        this.req.files[file.fieldname] = [placeholder]
      }
      break
  }

  return placeholder
}

FileAppender.prototype.removePlaceholder = function (placeholder) {
  switch (this.strategy) {
    case 'NONE': break
    case 'VALUE': break
    case 'ARRAY': arrayRemove(this.req.files, placeholder); break
    case 'OBJECT':
      if (this.req.files[placeholder.fieldname].length === 1) {
        delete this.req.files[placeholder.fieldname]
      } else {
        arrayRemove(this.req.files[placeholder.fieldname], placeholder)
      }
      break
  }
}

FileAppender.prototype.replacePlaceholder = function (placeholder, file) {
  if (this.strategy === 'VALUE') {
    this.req.file = file
    return
  }

  delete placeholder.fieldname
  objectAssign(placeholder, file)
}

module.exports = FileAppender