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TiddlyWiki5/core/modules/utils/dom/http.js

108 lines
3.0 KiB
JavaScript

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