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307 lines
12 KiB
JavaScript
307 lines
12 KiB
JavaScript
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/*
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Copyright (c) 2003 Jan-Klaas Kollhof
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This file is part of the JavaScript o lait library(jsolait).
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jsolait is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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This software is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this software; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/**
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Provides methods for making HTTP requests.
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*/
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Module("urllib","1.1.2", function(mod){
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/**
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Thrown if no request object could be instanciated.
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*/
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mod.NoHTTPRequestObject=Class("NoHTTPRequestObject", mod.Exception, function(publ, supr){
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/**
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Initializes the Exception.
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@param trace The error causing this exception.
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*/
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publ.init=function(trace){
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supr(this).init( "Could not create an HTTP request object", trace);
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}
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})
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/**
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Thrown if an HTTP request could not be opened.
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*/
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mod.RequestOpenFailed = Class("RequestOpenFailed", mod.Exception, function(publ, supr){
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/**
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Initializes the Exception.
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@param trace The error causing this exception.
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*/
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publ.init=function(trace){
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supr(this).init( "Opening of HTTP request failed.", trace);
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}
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})
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/**
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Thrown is arequest could not be sent to the server.
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*/
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mod.SendFailed=Class("SendFailed", mod.Exception, function(publ, supr){
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/**
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Initializes the Exception.
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@param trace The error causing this exception.
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*/
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publ.init = function(trace){
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supr(this).init( "Sending of HTTP request failed.", trace);
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}
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})
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/**
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Mimics the HTTPRequest object using Adobe's SVG Viewer's postURL and getURL.
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It can only process asyncronous connection and the only header that's supported is 'Content-Type'.
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*/
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var ASVRequest=Class("ASVRequest", function(publ){
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/**
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Initializes the ASVRequest.
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*/
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publ.init = function(){
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if((getURL==null) || (postURL==null)){
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throw "getURL and postURL are not available!";
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}else{
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this.readyState=0;
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this.responseText="";
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this.__contType ="";
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this.status=200;
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}
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}
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/**
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Mimics the open method without actually opening a connection.
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@param type "GET" or "POST".
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@param url The url to open.
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@param async=true True for async. connection. Otherwhise an exception is thrown.
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*/
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publ.open=function(type,url,async){
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if (async == false){
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throw "Can only open asynchronous connections!";
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}
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this.__type = type;
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this.__url = url;
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this.readyState=0;
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}
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/**
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Sets a header.
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@param name The header name. All but "Content-Type" are ignored.
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@param value The value of the header.
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*/
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publ.setRequestHeader=function(name, value){
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if (name=="Content-Type"){
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this.__contType =value;
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}
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}
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/**
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Sends the request.
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@param data The data to send when doing a post.
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*/
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publ.send=function(data){
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var self=this;
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var cbh=new Object();
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cbh.operationComplete = function(rsp){
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self.readyState=4;
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self.responseText=rsp.content;
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if(this.ignoreComplete == false){
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if(self.onreadystatechange){
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self.onreadystatechange();
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}
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}
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}
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cbh.ignoreComplete = false;
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try{
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if(this.__type =="GET"){
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getURL(this.__url,cbh);
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}else if (this.__type == "POST"){
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postURL(this.__url, data, cbh, this.__contType);
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}
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}catch(e){
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cbh.ignoreComplete=true;
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throw e;
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}
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}
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})
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/**
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Creates an HTTP request object for retreiving files.
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@return HTTP request object.
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*/
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var getHTTP=function() {
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var obj;
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try{ //to get the mozilla httprequest object
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obj = new XMLHttpRequest();
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}catch(e){
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try{ //to get MS HTTP request object
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obj=new ActiveXObject("Msxml2.XMLHTTP.4.0");
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}catch(e){
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try{ //to get MS HTTP request object
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obj=new ActiveXObject("Msxml2.XMLHTTP")
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}catch(e){
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try{// to get the old MS HTTP request object
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obj = new ActiveXObject("microsoft.XMLHTTP");
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}catch(e){
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try{//to create the ASV request object.
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obj = new ASVRequest();
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}catch(e){
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throw new mod.NoHTTPRequestObject("Neither Mozilla, IE nor ASV found. Can't do HTTP request without them.");
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}
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}
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}
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}
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}
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return obj;
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}
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/**
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Sends a request to a server.
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To explain the way the optional arguments work I will give examples:
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simple:
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sendRequest("get", "url")
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sendRequest("post", "url", "data")
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with headers:
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sendRequest("get", "url", [["headername","value"]])
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sendRequest("post", "url", "data", [["headername","value"]])
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with user information:
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sendRequest("get", "url", "user", "pass")
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sendRequest("post", "url", "user", "pass", "data")
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with headers and user information:
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sendRequest("get", "url", "user", "pass", [["headername","value"]])
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sendRequest("post", "url", "user", "pass", "data", [["headername","value"]])
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To make the request asynchronous just add a callback function as the last argument to the calls above.
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@param type Type of connection (GET, POST, ...).
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@param url The URL to retrieve.
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@param user=null The username for auth.
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@param pass=null The password. (must be set if user is set!)
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@param data="" The data to send with the request.
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@param headers=[] Array of headers. Each element in the array should be another array containing [headername,value].
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@param callback=null Callback for asynchronous connections. The callback is called after completion and is passed the request object as 1st Parameter.
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@return HTTP request object.
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*/
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mod.sendRequest=function(type, url, user, pass, data, headers, callback){
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var async=false;
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//check if the last argument is a function and treat it as callback;
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if(arguments[arguments.length-1] instanceof Function){
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var async=true;
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callback = arguments[arguments.length-1];
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}
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//treat sencond last(if callback)/last(if no callback) argument as headers
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var headindex=arguments.length-((async || arguments[arguments.length-1] == null) ?2:1);
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//is it an array then it's headers
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if(arguments[headindex] instanceof Array){
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headers=arguments[headindex];
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}else{
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headers=[];
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}
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//are user AND password not specified then assume data as 3rd argument.
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if(typeof user == "string" && typeof pass == "string"){
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if(typeof data != "string"){
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data="";
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}
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}else if (typeof user == "string"){
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data = user;
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user=null;
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pass=null;
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}else{
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user=null;
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pass=null;
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}
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var xmlhttp= getHTTP();
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try{
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if(user!=null){
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xmlhttp.open(type, url, async, user, pass);
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}else{
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xmlhttp.open(type, url, async);
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}
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}catch(e){
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throw new mod.RequestOpenFailed(e);
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}
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//set headers
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for(var i=0;i< headers.length;i++){
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xmlhttp.setRequestHeader(headers[i][0], headers[i][1]);
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}
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if(async){//set up a callback
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xmlhttp.onreadystatechange=function(){
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if (xmlhttp.readyState==4) {
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callback(xmlhttp);
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xmlhttp = null; //help IE with arbage collection
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}else if (xmlhttp.readyState==2){
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//status property should be available (MS IXMLHTTPRequest documentation)
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//in Mozilla it is not if the request failed(server not reachable)
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//in IE it is not available at all ?!
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try{//see if it is mozilla otherwise don't care.
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var isNetscape = netscape;
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try{//if status is not available the request failed.
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var s=xmlhttp.status;
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}catch(e){//call the callback because Mozilla will not get to readystate 4
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callback(xmlhttp);
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xmlhttp = null;
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}
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}catch(e){
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}
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}
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}
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}
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try{
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xmlhttp.send(data);
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}catch(e){
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throw new mod.SendFailed(e);
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}
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return xmlhttp;
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}
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/**
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Shorthand for a GET request.
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It calls sendRequest with "GET" as first argument.
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See the sendRequest method for more information.
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@param url The URL to retrieve.
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@param user=null The username for auth.
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@param pass=null The password. (must be set if user is set!)
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@param headers=[] Array of headers. Each element in the array should be another array containing [headername,value].
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@param callback=null Callback for asynchronous connections. The callback is called after completion and is passed the request object as 1st Parameter.
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@return HTTP request object.
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*/
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mod.getURL=function(url, user, pass, headers, callback) {
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var a= new Array("GET");
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for(var i=0;i<arguments.length;i++){
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a.push(arguments[i]);
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}
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return mod.sendRequest.apply(this,a)
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}
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/**
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Shorthand for a POST request.
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It calls sendRequest with "POST" as first argument.
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See the sendRequest method for more information.
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@param url The URL to retrieve.
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@param user=null The username for auth.
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@param pass=null The password. (must be set if user is set!)
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@param data="" The data to send with the request.
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@param headers=[] Array of headers. Each element in the array should be another array containing [headername,value].
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@param callback=null Callback for asynchronous connections. The callback is called after completion and is passed the request object as 1st Parameter.
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@return HTTP request object.
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*/
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mod.postURL=function(url, user, pass, data, headers, callback) {
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var a= new Array("POST");
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for(var i=0;i<arguments.length;i++){
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a.push(arguments[i]);
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}
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return mod.sendRequest.apply(this,a)
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}
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})
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