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/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
/* vim: set ft=javascript ts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
"use strict";
const {Cc, Ci, components} = require("chrome");
const xpcom = require("sdk/platform/xpcom");
const {Unknown} = require("sdk/platform/xpcom");
const {Class} = require("sdk/core/heritage");
const categoryManager = Cc["@mozilla.org/categorymanager;1"]
.getService(Ci.nsICategoryManager);
loader.lazyRequireGetter(this, "NetworkHelper",
"devtools/shared/webconsole/network-helper");
// Constants
const JSON_TYPE = "application/json";
const CONTRACT_ID = "@mozilla.org/devtools/jsonview-sniffer;1";
const CLASS_ID = "{4148c488-dca1-49fc-a621-2a0097a62422}";
const JSON_VIEW_MIME_TYPE = "application/vnd.mozilla.json.view";
const JSON_VIEW_TYPE = "JSON View";
const CONTENT_SNIFFER_CATEGORY = "net-content-sniffers";
/**
* This component represents a sniffer (implements nsIContentSniffer
* interface) responsible for changing top level 'application/json'
* document types to: 'application/vnd.mozilla.json.view'.
*
* This internal type is consequently rendered by JSON View component
* that represents the JSON through a viewer interface.
*/
var Sniffer = Class({
extends: Unknown,
interfaces: [
"nsIContentSniffer",
],
get wrappedJSObject() {
return this;
},
getMIMETypeFromContent: function (request, data, length) {
// JSON View is enabled only for top level loads only.
if (!NetworkHelper.isTopLevelLoad(request)) {
return "";
}
if (request instanceof Ci.nsIChannel) {
try {
if (request.contentDisposition ==
Ci.nsIChannel.DISPOSITION_ATTACHMENT) {
return "";
}
} catch (e) {
// Channel doesn't support content dispositions
}
// Check the response content type and if it's application/json
// change it to new internal type consumed by JSON View.
if (request.contentType == JSON_TYPE) {
return JSON_VIEW_MIME_TYPE;
}
}
return "";
}
});
var service = xpcom.Service({
id: components.ID(CLASS_ID),
contract: CONTRACT_ID,
Component: Sniffer,
register: false,
unregister: false
});
function register() {
if (!xpcom.isRegistered(service)) {
xpcom.register(service);
categoryManager.addCategoryEntry(CONTENT_SNIFFER_CATEGORY, JSON_VIEW_TYPE,
CONTRACT_ID, false, false);
return true;
}
return false;
}
function unregister() {
if (xpcom.isRegistered(service)) {
categoryManager.deleteCategoryEntry(CONTENT_SNIFFER_CATEGORY,
JSON_VIEW_TYPE, false);
xpcom.unregister(service);
return true;
}
return false;
}
exports.JsonViewSniffer = {
register: register,
unregister: unregister
};
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