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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