114 lines
3.3 KiB
JavaScript
114 lines
3.3 KiB
JavaScript
"use strict"
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var buildQueryString = require("../querystring/build")
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module.exports = function($window, Promise) {
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var callbackCount = 0
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function ajax(args) {
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return new Promise(function(resolve, reject) {
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var useBody = args.useBody != null ? args.useBody : args.method !== "GET" && args.method !== "TRACE"
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if (typeof args.serialize !== "function") args.serialize = JSON.stringify
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if (typeof args.deserialize !== "function") args.deserialize = deserialize
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if (typeof args.extract !== "function") args.extract = extract
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args.url = interpolate(args.url, args.data)
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if (useBody) args.data = args.serialize(args.data)
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else args.url = assemble(args.url, args.data)
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var xhr = new $window.XMLHttpRequest()
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xhr.open(args.method, args.url, args.async || true, args.user, args.password)
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if (args.serialize === JSON.stringify && useBody) {
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xhr.setRequestHeader("Content-Type", "application/json; charset=utf-8")
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}
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if (args.deserialize === deserialize) {
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xhr.setRequestHeader("Accept", "application/json, text/*")
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}
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if (typeof args.config === "function") xhr = args.config(xhr, args) || xhr
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xhr.onreadystatechange = function() {
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if (xhr.readyState === 4) {
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try {
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var response = args.deserialize(args.extract(xhr, args))
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if (xhr.status >= 200 && xhr.status < 300) {
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if (typeof args.type === "function") {
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if (response instanceof Array) {
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for (var i = 0; i < response.length; i++) {
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response[i] = new args.type(response[i])
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}
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}
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else response = new args.type(response[i])
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}
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resolve(response)
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}
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else reject(new Error(xhr.responseText))
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}
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catch (e) {
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reject(e)
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}
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}
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}
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if (useBody) xhr.send(args.data)
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else xhr.send()
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})
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}
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function jsonp(args) {
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return new Promise(function(resolve, reject) {
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var callbackKey = "_mithril_" + Math.round(Math.random() * 1e16) + "_" + callbackCount++
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var script = $window.document.createElement("script")
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$window[callbackKey] = function(data) {
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script.parentNode.removeChild(script)
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resolve(data)
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$window[callbackKey] = undefined
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}
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script.onerror = function() {
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script.parentNode.removeChild(script)
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reject(new Error("JSONP request failed"))
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$window[callbackKey] = undefined
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}
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if (args.data == null) args.data = {}
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args.url = interpolate(args.url, args.data)
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args.data[args.callbackKey || "callback"] = callbackKey
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script.src = assemble(args.url, args.data)
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$window.document.documentElement.appendChild(script)
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})
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}
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function interpolate(url, data) {
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if (data == null) return url
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var tokens = url.match(/:[^\/]+/gi) || []
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for (var i = 0; i < tokens.length; i++) {
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var key = tokens[i].slice(1)
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if (data[key] != null) {
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url = url.replace(tokens[i], data[key])
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delete data[key]
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}
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}
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return url
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}
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function assemble(url, data) {
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var querystring = buildQueryString(data)
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if (querystring !== "") {
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var prefix = url.indexOf("?") < 0 ? "?" : "&"
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url += prefix + querystring
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}
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return url
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}
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function deserialize(data) {
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try {return data !== "" ? JSON.parse(data) : null}
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catch (e) {throw new Error(data)}
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}
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function extract(xhr) {return xhr.responseText}
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return {ajax: ajax, jsonp: jsonp}
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}
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