mirror of
https://github.com/Jermolene/TiddlyWiki5
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108 lines
3.0 KiB
JavaScript
108 lines
3.0 KiB
JavaScript
/*\
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title: $:/core/modules/utils/dom/http.js
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type: application/javascript
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module-type: utils
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Browser HTTP support
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\*/
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(function(){
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/*jslint node: true, browser: true */
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/*global $tw: false */
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"use strict";
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/*
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A quick and dirty HTTP function; to be refactored later. Options are:
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url: URL to retrieve
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headers: hashmap of headers to send
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type: GET, PUT, POST etc
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callback: function invoked with (err,data,xhr)
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returnProp: string name of the property to return as first argument of callback
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*/
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exports.httpRequest = function(options) {
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var type = options.type || "GET",
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url = options.url,
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headers = options.headers || {accept: "application/json"},
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hasHeader = function(targetHeader) {
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targetHeader = targetHeader.toLowerCase();
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var result = false;
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$tw.utils.each(headers,function(header,headerTitle,object) {
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if(headerTitle.toLowerCase() === targetHeader) {
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result = true;
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}
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});
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return result;
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},
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getHeader = function(targetHeader) {
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return headers[targetHeader] || headers[targetHeader.toLowerCase()];
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},
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isSimpleRequest = function(type,headers) {
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if(["GET","HEAD","POST"].indexOf(type) === -1) {
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return false;
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}
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for(var header in headers) {
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if(["accept","accept-language","content-language","content-type"].indexOf(header.toLowerCase()) === -1) {
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return false;
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}
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}
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if(hasHeader("Content-Type") && ["application/x-www-form-urlencoded","multipart/form-data","text/plain"].indexOf(getHeader["Content-Type"]) === -1) {
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return false;
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}
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return true;
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},
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returnProp = options.returnProp || "responseText",
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request = new XMLHttpRequest(),
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data = "",
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f,results;
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// Massage the data hashmap into a string
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if(options.data) {
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if(typeof options.data === "string") { // Already a string
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data = options.data;
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} else { // A hashmap of strings
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results = [];
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$tw.utils.each(options.data,function(dataItem,dataItemTitle) {
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results.push(dataItemTitle + "=" + encodeURIComponent(dataItem));
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});
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if(type === "GET" || type === "HEAD") {
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url += "?" + results.join("&");
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} else {
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data = results.join("&");
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}
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}
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}
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// Set up the state change handler
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request.onreadystatechange = function() {
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if(this.readyState === 4) {
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if(this.status === 200 || this.status === 201 || this.status === 204) {
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// Success!
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options.callback(null,this[returnProp],this);
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return;
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}
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// Something went wrong
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options.callback($tw.language.getString("Error/XMLHttpRequest") + ": " + this.status,null,this);
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}
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};
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// Make the request
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request.open(type,url,true);
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if(headers) {
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$tw.utils.each(headers,function(header,headerTitle,object) {
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request.setRequestHeader(headerTitle,header);
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});
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}
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if(data && !hasHeader("Content-Type")) {
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request.setRequestHeader("Content-Type","application/x-www-form-urlencoded; charset=UTF-8");
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}
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if(!hasHeader("X-Requested-With") && !isSimpleRequest(type,headers)) {
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request.setRequestHeader("X-Requested-With","TiddlyWiki");
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}
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try {
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request.send(data);
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} catch(e) {
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options.callback(e,null,this);
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}
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return request;
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};
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})();
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