我正在尝试实现一个修改POST请求数据的Firefox扩展。
代码如下,它在标记为“失败!!! ”
的地方失败任何见解都会有所帮助。
Components.utils.import("resource://gre/modules/XPCOMUtils.jsm");
var newData = "test 123";
function LOG(msg) {
var consoleService = Components.classes["@mozilla.org/consoleservice;1"]
.getService(Components.interfaces.nsIConsoleService);
consoleService.logStringMessage(msg);
}
function CMP() {
this.registered = false;
this.register();
}
CMP.prototype = {
register: function() {
if (this.registered == false) {
var observerService = Components.classes["@mozilla.org/observer-service;1"]
.getService(Components.interfaces.nsIObserverService);
observerService.addObserver(this, "http-on-modify-request", false);
this.registered = true;
}
},
observe: function(subject, topic, data)
{
LOG("Inside observe");
if (topic == "http-on-modify-request")
{
LOG("TOPIC is http-on-modify-request");
var httpChannel = subject.QueryInterface(Components.interfaces.nsIHttpChannel);
if(httpChannel.requestMethod == "POST"){
LOG("Inside POST")
var uploadChannel = httpChannel.QueryInterface(Components.interfaces.nsIUploadChannel);
//var uploadChannelStream = uploadChannel.uploadStream;
在此处修改数据。在这里进行测试我将“test 123”作为新数据传递
var newStringInputStream = Components.classes['@mozilla.org/io/string-input-stream;1'].createInstance(Components.interfaces.nsIStringInputStream);
newStringInputStream.setData(newData,newData.length);
LOG("set data in newStringInputStream!!");
uploadChannel.setUploadStream(newStringInputStream, "text/plain", -1 );// Fails here!!!
httpChannel.requestMethod = "POST";
LOG("upload DONE!!")
}
}
},
QueryInterface : function(aIID) {
if (aIID.equals(Components.interfaces.nsISupports) ||
aIID.equals(Components.interfaces.nsIObserver))
return this;
throw Components.results.NS_NOINTERFACE;
},
unregister: function() {
var observerService = Components.classes["@mozilla.org/observer-service;1"]
.getService(Components.interfaces.nsIObserverService);
observerService.removeObserver(this, "http-on-modify-request");
},
classID: Components.ID('{F799F47E-ABA5-4AF1-B8F2-BD74E3E5BCC0}'),
QueryInterface: XPCOMUtils.generateQI([Components.interfaces.nsIObserver])
};
if (XPCOMUtils.generateNSGetFactory)
{
var NSGetFactory = XPCOMUtils.generateNSGetFactory([CMP]);
}
答案 0 :(得分:1)
通过在上面的代码中进行更改来修复它。主要的变化是在httpChannel.uploadStream中设置修改后的数据。
希望这有助于某人!
var httpChannel = subject.QueryInterface(Components.interfaces.nsIHttpChannel);
if(httpChannel.requestMethod == "POST")
{
LOG("Inside POST")
var uploadChannel = httpChannel.QueryInterface(Components.interfaces.nsIUploadChannel);
var newStringInputStream = Components.classes['@mozilla.org/io/string-input-stream;1'].createInstance(Components.interfaces.nsIStringInputStream);
newStringInputStream.setData(newData,newData.length);
var uploadChannelStream = uploadChannel.uploadStream;
uploadChannelStream = uploadChannelStream.QueryInterface(Components.interfaces.nsISeekableStream).seek(Components.interfaces.nsISeekableStream.NS_SEEK_SET, 0);
httpChannel.uploadStream.QueryInterface(Components.interfaces.nsIMIMEInputStream);
httpChannel.uploadStream.setData(newStringInputStream);
LOG("Done POST")
}