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04c1b90604
MozReview-Commit-ID: BtnH41N1w8P --HG-- extra : rebase_source : 7c6e416f9130fbd9bb6deff2bee9a24fc1a937c0
317 lines
9.7 KiB
JavaScript
317 lines
9.7 KiB
JavaScript
/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
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/* vim: set ft=javascript ts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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"use strict";
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const {Cc, Ci, Cu, CC} = require("chrome");
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const { XPCOMUtils } = Cu.import("resource://gre/modules/XPCOMUtils.jsm", {});
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const Services = require("Services");
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loader.lazyRequireGetter(this, "NetworkHelper",
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"devtools/shared/webconsole/network-helper");
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loader.lazyGetter(this, "debug", function () {
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let {AppConstants} = require("resource://gre/modules/AppConstants.jsm");
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return !!(AppConstants.DEBUG || AppConstants.DEBUG_JS_MODULES);
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});
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const childProcessMessageManager =
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Cc["@mozilla.org/childprocessmessagemanager;1"]
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.getService(Ci.nsISyncMessageSender);
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const BinaryInput = CC("@mozilla.org/binaryinputstream;1",
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"nsIBinaryInputStream", "setInputStream");
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const BufferStream = CC("@mozilla.org/io/arraybuffer-input-stream;1",
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"nsIArrayBufferInputStream", "setData");
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// Localization
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loader.lazyGetter(this, "jsonViewStrings", () => {
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return Services.strings.createBundle(
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"chrome://devtools/locale/jsonview.properties");
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});
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/**
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* This object detects 'application/vnd.mozilla.json.view' content type
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* and converts it into a JSON Viewer application that allows simple
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* JSON inspection.
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*
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* Inspired by JSON View: https://github.com/bhollis/jsonview/
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*/
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function Converter() {}
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Converter.prototype = {
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QueryInterface: XPCOMUtils.generateQI([
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Ci.nsIStreamConverter,
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Ci.nsIStreamListener,
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Ci.nsIRequestObserver
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]),
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get wrappedJSObject() {
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return this;
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},
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/**
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* This component works as such:
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* 1. asyncConvertData captures the listener
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* 2. onStartRequest fires, initializes stuff, modifies the listener
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* to match our output type
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* 3. onDataAvailable decodes and inserts data into a text node
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* 4. onStopRequest flushes data and spits back to the listener
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* 5. convert does nothing, it's just the synchronous version
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* of asyncConvertData
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*/
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convert: function (fromStream, fromType, toType, ctx) {
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return fromStream;
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},
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asyncConvertData: function (fromType, toType, listener, ctx) {
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this.listener = listener;
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},
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onDataAvailable: function (request, context, inputStream, offset, count) {
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// Decode and insert data.
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let buffer = new ArrayBuffer(count);
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new BinaryInput(inputStream).readArrayBuffer(count, buffer);
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this.decodeAndInsertBuffer(buffer);
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},
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onStartRequest: function (request, context) {
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// Set the content type to HTML in order to parse the doctype, styles
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// and scripts. The JSON will be manually inserted as text.
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request.QueryInterface(Ci.nsIChannel);
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request.contentType = "text/html";
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// Don't honor the charset parameter and use UTF-8 (see bug 741776).
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request.contentCharset = "UTF-8";
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this.decoder = new TextDecoder("UTF-8");
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// Changing the content type breaks saving functionality. Fix it.
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fixSave(request);
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// Because content might still have a reference to this window,
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// force setting it to a null principal to avoid it being same-
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// origin with (other) content.
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request.loadInfo.resetPrincipalToInheritToNullPrincipal();
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// Start the request.
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this.listener.onStartRequest(request, context);
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// Initialize stuff.
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let win = NetworkHelper.getWindowForRequest(request);
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this.data = exportData(win, request);
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insertJsonData(win, this.data.json);
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win.addEventListener("contentMessage", onContentMessage, false, true);
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keepThemeUpdated(win);
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// Send the initial HTML code.
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let buffer = new TextEncoder().encode(initialHTML(win.document)).buffer;
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let stream = new BufferStream(buffer, 0, buffer.byteLength);
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this.listener.onDataAvailable(request, context, stream, 0, stream.available());
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},
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onStopRequest: function (request, context, statusCode) {
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// Flush data.
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this.decodeAndInsertBuffer(new ArrayBuffer(0), true);
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// Stop the request.
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this.listener.onStopRequest(request, context, statusCode);
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this.listener = null;
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this.decoder = null;
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this.data = null;
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},
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// Decodes an ArrayBuffer into a string and inserts it into the page.
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decodeAndInsertBuffer: function (buffer, flush = false) {
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// Decode the buffer into a string.
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let data = this.decoder.decode(buffer, {stream: !flush});
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// Using `appendData` instead of `textContent +=` is important to avoid
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// repainting previous data.
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this.data.json.appendData(data);
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}
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};
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// Lets "save as" save the original JSON, not the viewer.
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// To save with the proper extension we need the original content type,
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// which has been replaced by application/vnd.mozilla.json.view
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function fixSave(request) {
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let match;
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if (request instanceof Ci.nsIHttpChannel) {
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try {
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let header = request.getResponseHeader("Content-Type");
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match = header.match(/^(application\/(?:[^;]+\+)?json)(?:;|$)/);
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} catch (err) {
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// Handled below
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}
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} else {
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let uri = request.QueryInterface(Ci.nsIChannel).URI.spec;
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match = uri.match(/^data:(application\/(?:[^;,]+\+)?json)[;,]/);
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}
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let originalType;
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if (match) {
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originalType = match[1];
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} else {
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originalType = "application/json";
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}
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request.QueryInterface(Ci.nsIWritablePropertyBag);
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request.setProperty("contentType", originalType);
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}
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// Exports variables that will be accessed by the non-privileged scripts.
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function exportData(win, request) {
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let data = Cu.createObjectIn(win, {
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defineAs: "JSONView"
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});
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data.debug = debug;
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data.json = new win.Text();
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data.readyState = "uninitialized";
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let Locale = {
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$STR: key => {
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try {
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return jsonViewStrings.GetStringFromName(key);
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} catch (err) {
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console.error(err);
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return undefined;
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}
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}
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};
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data.Locale = Cu.cloneInto(Locale, win, {cloneFunctions: true});
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let headers = {
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response: [],
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request: []
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};
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// The request doesn't have to be always nsIHttpChannel
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// (e.g. in case of data: URLs)
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if (request instanceof Ci.nsIHttpChannel) {
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request.visitResponseHeaders({
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visitHeader: function (name, value) {
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headers.response.push({name: name, value: value});
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}
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});
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request.visitRequestHeaders({
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visitHeader: function (name, value) {
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headers.request.push({name: name, value: value});
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}
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});
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}
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data.headers = Cu.cloneInto(headers, win);
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return data;
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}
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// Builds an HTML string that will be used to load stylesheets and scripts.
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function initialHTML(doc) {
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// Creates an element with the specified type, attributes and children.
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function element(type, attributes = {}, children = []) {
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let el = doc.createElement(type);
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for (let [attr, value] of Object.entries(attributes)) {
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el.setAttribute(attr, value);
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}
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el.append(...children);
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return el;
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}
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let os;
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let platform = Services.appinfo.OS;
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if (platform.startsWith("WINNT")) {
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os = "win";
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} else if (platform.startsWith("Darwin")) {
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os = "mac";
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} else {
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os = "linux";
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}
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// The base URI is prepended to all URIs instead of using a <base> element
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// because the latter can be blocked by a CSP base-uri directive (bug 1316393)
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let baseURI = "resource://devtools-client-jsonview/";
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return "<!DOCTYPE html>\n" +
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element("html", {
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"platform": os,
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"class": "theme-" + Services.prefs.getCharPref("devtools.theme"),
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"dir": Services.locale.isAppLocaleRTL ? "rtl" : "ltr"
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}, [
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element("head", {}, [
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element("link", {
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rel: "stylesheet",
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type: "text/css",
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href: baseURI + "css/main.css",
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}),
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]),
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element("body", {}, [
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element("div", {"id": "content"}, [
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element("div", {"id": "json"})
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]),
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element("script", {
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src: baseURI + "lib/require.js",
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"data-main": baseURI + "viewer-config.js",
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}),
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]),
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]).outerHTML;
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}
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// We insert the received data into a text node, which should be appended into
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// the #json element so that the JSON is still displayed even if JS is disabled.
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// However, the HTML parser is not synchronous, so this function uses a mutation
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// observer to detect the creation of the element. Then the text node is appended.
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function insertJsonData(win, json) {
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new win.MutationObserver(function (mutations, observer) {
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for (let {target, addedNodes} of mutations) {
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if (target.nodeType == 1 && target.id == "content") {
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for (let node of addedNodes) {
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if (node.nodeType == 1 && node.id == "json") {
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observer.disconnect();
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node.append(json);
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return;
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}
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}
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}
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}
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}).observe(win.document, {
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childList: true,
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subtree: true,
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});
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}
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function keepThemeUpdated(win) {
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let listener = function () {
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let theme = Services.prefs.getCharPref("devtools.theme");
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win.document.documentElement.className = "theme-" + theme;
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};
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Services.prefs.addObserver("devtools.theme", listener);
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win.addEventListener("unload", function (event) {
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Services.prefs.removeObserver("devtools.theme", listener);
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win = null;
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}, {once: true});
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}
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// Chrome <-> Content communication
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function onContentMessage(e) {
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// Do not handle events from different documents.
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let win = this;
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if (win != e.target) {
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return;
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}
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let value = e.detail.value;
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switch (e.detail.type) {
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case "save":
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childProcessMessageManager.sendAsyncMessage(
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"devtools:jsonview:save", value);
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}
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}
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function createInstance() {
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return new Converter();
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}
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exports.JsonViewService = {
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createInstance: createInstance,
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};
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