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Filename :
wp-polyfill-formdata.js
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if (typeof FormData === 'undefined' || !FormData.prototype.keys) { const global = typeof window === 'object' ? window : typeof self === 'object' ? self : this // keep a reference to native implementation const _FormData = global.FormData // To be monkey patched const _send = global.XMLHttpRequest && global.XMLHttpRequest.prototype.send const _fetch = global.Request && global.fetch // Unable to patch Request constructor correctly // const _Request = global.Request // only way is to use ES6 class extend // https://github.com/babel/babel/issues/1966 const stringTag = global.Symbol && Symbol.toStringTag const map = new WeakMap const wm = o => map.get(o) const arrayFrom = Array.from || (obj => [].slice.call(obj)) // Add missing stringTags to blob and files if (stringTag) { if (!Blob.prototype[stringTag]) { Blob.prototype[stringTag] = 'Blob' } if ('File' in global && !File.prototype[stringTag]) { File.prototype[stringTag] = 'File' } } // Fix so you can construct your own File try { new File([], '') } catch (a) { global.File = function(b, d, c) { const blob = new Blob(b, c) const t = c && void 0 !== c.lastModified ? new Date(c.lastModified) : new Date Object.defineProperties(blob, { name: { value: d }, lastModifiedDate: { value: t }, lastModified: { value: +t }, toString: { value() { return '[object File]' } } }) if (stringTag) { Object.defineProperty(blob, stringTag, { value: 'File' }) } return blob } } function normalizeValue([value, filename]) { if (value instanceof Blob) // Should always returns a new File instance // console.assert(fd.get(x) !== fd.get(x)) value = new File([value], filename, { type: value.type, lastModified: value.lastModified }) return value } function stringify(name) { if (!arguments.length) throw new TypeError('1 argument required, but only 0 present.') return [name + ''] } function normalizeArgs(name, value, filename) { if (arguments.length < 2) throw new TypeError( `2 arguments required, but only ${arguments.length} present.` ) return value instanceof Blob // normalize name and filename if adding an attachment ? [name + '', value, filename !== undefined ? filename + '' // Cast filename to string if 3th arg isn't undefined : typeof value.name === 'string' // if name prop exist ? value.name // Use File.name : 'blob'] // otherwise fallback to Blob // If no attachment, just cast the args to strings : [name + '', value + ''] } function each (arr, cb) { for (let i = 0; i < arr.length; i++) { cb(arr[i]) } } /** * @implements {Iterable} */ class FormDataPolyfill { /** * FormData class * * @param {HTMLElement=} form */ constructor(form) { map.set(this, Object.create(null)) if (!form) return this const self = this each(form.elements, elm => { if (!elm.name || elm.disabled || elm.type === 'submit' || elm.type === 'button') return if (elm.type === 'file') { each(elm.files || [], file => { self.append(elm.name, file) }) } else if (elm.type === 'select-multiple' || elm.type === 'select-one') { each(elm.options, opt => { !opt.disabled && opt.selected && self.append(elm.name, opt.value) }) } else if (elm.type === 'checkbox' || elm.type === 'radio') { if (elm.checked) self.append(elm.name, elm.value) } else { self.append(elm.name, elm.value) } }) } /** * Append a field * * @param {String} name field name * @param {String|Blob|File} value string / blob / file * @param {String=} filename filename to use with blob * @return {Undefined} */ append(name, value, filename) { const map = wm(this) if (!map[name]) map[name] = [] map[name].push([value, filename]) } /** * Delete all fields values given name * * @param {String} name Field name * @return {Undefined} */ delete(name) { delete wm(this)[name] } /** * Iterate over all fields as [name, value] * * @return {Iterator} */ *entries() { const map = wm(this) for (let name in map) for (let value of map[name]) yield [name, normalizeValue(value)] } /** * Iterate over all fields * * @param {Function} callback Executed for each item with parameters (value, name, thisArg) * @param {Object=} thisArg `this` context for callback function * @return {Undefined} */ forEach(callback, thisArg) { for (let [name, value] of this) callback.call(thisArg, value, name, this) } /** * Return first field value given name * or null if non existen * * @param {String} name Field name * @return {String|File|null} value Fields value */ get(name) { const map = wm(this) return map[name] ? normalizeValue(map[name][0]) : null } /** * Return all fields values given name * * @param {String} name Fields name * @return {Array} [{String|File}] */ getAll(name) { return (wm(this)[name] || []).map(normalizeValue) } /** * Check for field name existence * * @param {String} name Field name * @return {boolean} */ has(name) { return name in wm(this) } /** * Iterate over all fields name * * @return {Iterator} */ *keys() { for (let [name] of this) yield name } /** * Overwrite all values given name * * @param {String} name Filed name * @param {String} value Field value * @param {String=} filename Filename (optional) * @return {Undefined} */ set(name, value, filename) { wm(this)[name] = [[value, filename]] } /** * Iterate over all fields * * @return {Iterator} */ *values() { for (let [name, value] of this) yield value } /** * Return a native (perhaps degraded) FormData with only a `append` method * Can throw if it's not supported * * @return {FormData} */ ['_asNative']() { const fd = new _FormData for (let [name, value] of this) fd.append(name, value) return fd } /** * [_blob description] * * @return {Blob} [description] */ ['_blob']() { const boundary = '----formdata-polyfill-' + Math.random() const chunks = [] for (let [name, value] of this) { chunks.push(`--${boundary}\r\n`) if (value instanceof Blob) { chunks.push( `Content-Disposition: form-data; name="${name}"; filename="${value.name}"\r\n`, `Content-Type: ${value.type || 'application/octet-stream'}\r\n\r\n`, value, '\r\n' ) } else { chunks.push( `Content-Disposition: form-data; name="${name}"\r\n\r\n${value}\r\n` ) } } chunks.push(`--${boundary}--`) return new Blob(chunks, {type: 'multipart/form-data; boundary=' + boundary}) } /** * The class itself is iterable * alias for formdata.entries() * * @return {Iterator} */ [Symbol.iterator]() { return this.entries() } /** * Create the default string description. * * @return {String} [object FormData] */ toString() { return '[object FormData]' } } if (stringTag) { /** * Create the default string description. * It is accessed internally by the Object.prototype.toString(). * * @return {String} FormData */ FormDataPolyfill.prototype[stringTag] = 'FormData' } const decorations = [ ['append', normalizeArgs], ['delete', stringify], ['get', stringify], ['getAll', stringify], ['has', stringify], ['set', normalizeArgs] ] decorations.forEach(arr => { const orig = FormDataPolyfill.prototype[arr[0]] FormDataPolyfill.prototype[arr[0]] = function() { return orig.apply(this, arr[1].apply(this, arrayFrom(arguments))) } }) // Patch xhr's send method to call _blob transparently if (_send) { XMLHttpRequest.prototype.send = function(data) { // I would check if Content-Type isn't already set // But xhr lacks getRequestHeaders functionallity // https://github.com/jimmywarting/FormData/issues/44 if (data instanceof FormDataPolyfill) { const blob = data['_blob']() this.setRequestHeader('Content-Type', blob.type) _send.call(this, blob) } else { _send.call(this, data) } } } // Patch fetch's function to call _blob transparently if (_fetch) { const _fetch = global.fetch global.fetch = function(input, init) { if (init && init.body && init.body instanceof FormDataPolyfill) { init.body = init.body['_blob']() } return _fetch(input, init) } } global['FormData'] = FormDataPolyfill }