Quelle webconsole.js Sprache: JAVA

/* 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/. */

/* global clearConsoleEvents */

"use strict";

const { Actor } = require("resource://devtools/shared/protocol.js");
const {
  webconsoleSpec,
} = require("resource://devtools/shared/specs/webconsole.js");

const { ThreadActor } = require("resource://devtools/server/actors/thread.js");
const {
  LongStringActor,
} = require("resource://devtools/server/actors/string.js");
const {
  createValueGrip,
  isArray,
  stringIsLong,
} = require("resource://devtools/server/actors/object/utils.js");
const DevToolsUtils = require("resource://devtools/shared/DevToolsUtils.js");
const ErrorDocs = require("resource://devtools/server/actors/errordocs.js");
const Targets = require("resource://devtools/server/actors/targets/index.js");

loader.lazyRequireGetter(
  this,
  "evalWithDebugger",
  "resource://devtools/server/actors/webconsole/eval-with-debugger.js",
  true
);
loader.lazyRequireGetter(
  this,
  "ConsoleFileActivityListener",
  "resource://devtools/server/actors/webconsole/listeners/console-file-activity.js",
  true
);
loader.lazyRequireGetter(
  this,
  "jsPropertyProvider",
  "resource://devtools/shared/webconsole/js-property-provider.js",
  true
);
loader.lazyRequireGetter(
  this,
  ["isCommand"],
  "resource://devtools/server/actors/webconsole/commands/parser.js",
  true
);
loader.lazyRequireGetter(
  this,
  ["CONSOLE_WORKER_IDS", "WebConsoleUtils"],
  "resource://devtools/server/actors/webconsole/utils.js",
  true
);
loader.lazyRequireGetter(
  this,
  ["WebConsoleCommandsManager"],
  "resource://devtools/server/actors/webconsole/commands/manager.js",
  true
);
loader.lazyRequireGetter(
  this,
  "EventEmitter",
  "resource://devtools/shared/event-emitter.js"
);
loader.lazyRequireGetter(
  this,
  "MESSAGE_CATEGORY",
  "resource://devtools/shared/constants.js",
  true
);

// Generated by /devtools/shared/webconsole/GenerateReservedWordsJS.py
loader.lazyRequireGetter(
  this,
  "RESERVED_JS_KEYWORDS",
  "resource://devtools/shared/webconsole/reserved-js-words.js"
);

// Overwrite implemented listeners for workers so that we don't attempt
// to load an unsupported module.
if (isWorker) {
  loader.lazyRequireGetter(
    this,
    ["ConsoleAPIListener", "ConsoleServiceListener"],
    "resource://devtools/server/actors/webconsole/worker-listeners.js",
    true
  );
} else {
  loader.lazyRequireGetter(
    this,
    "ConsoleAPIListener",
    "resource://devtools/server/actors/webconsole/listeners/console-api.js",
    true
  );
  loader.lazyRequireGetter(
    this,
    "ConsoleServiceListener",
    "resource://devtools/server/actors/webconsole/listeners/console-service.js",
    true
  );
  loader.lazyRequireGetter(
    this,
    "ConsoleReflowListener",
    "resource://devtools/server/actors/webconsole/listeners/console-reflow.js",
    true
  );
  loader.lazyRequireGetter(
    this,
    "DocumentEventsListener",
    "resource://devtools/server/actors/webconsole/listeners/document-events.js",
    true
  );
}
loader.lazyRequireGetter(
  this,
  "ObjectUtils",
  "resource://devtools/server/actors/object/utils.js"
);

function isObject(value) {
  return Object(value) === value;
}

/**
* The WebConsoleActor implements capabilities needed for the Web Console
* feature.
*
* @constructor
* @param object connection
*        The connection to the client, DevToolsServerConnection.
* @param object [targetActor]
*        Optional, the parent actor.
*/
class WebConsoleActor extends Actor {
  constructor(connection, targetActor) {
    super(connection, webconsoleSpec);

    this.targetActor = targetActor;

    this.dbg = this.targetActor.dbg;

    this._gripDepth = 0;
    this._evalCounter = 0;
    this._listeners = new Set();
    this._lastConsoleInputEvaluation = undefined;

    this._onWillNavigate = this._onWillNavigate.bind(this);
    this._onChangedToplevelDocument =
      this._onChangedToplevelDocument.bind(this);
    this.onConsoleServiceMessage = this.onConsoleServiceMessage.bind(this);
    this.onConsoleAPICall = this.onConsoleAPICall.bind(this);
    this.onDocumentEvent = this.onDocumentEvent.bind(this);

    EventEmitter.on(
      this.targetActor,
      "changed-toplevel-document",
      this._onChangedToplevelDocument
    );
  }

  /**
   * Debugger instance.
   *
   * @see jsdebugger.sys.mjs
   */
  dbg = null;

  /**
   * This is used by the ObjectActor to keep track of the depth of grip() calls.
   * @private
   * @type number
   */
  _gripDepth = null;

  /**
   * Holds a set of all currently registered listeners.
   *
   * @private
   * @type Set
   */
  _listeners = null;

  /**
   * The global we work with (this can be a Window, a Worker global or even a Sandbox
   * for processes and addons).
   *
   * @type nsIDOMWindow, WorkerGlobalScope or Sandbox
   */
  get global() {
    if (this.targetActor.isRootActor) {
      return this._getWindowForBrowserConsole();
    }
    return this.targetActor.targetGlobal;
  }

  /**
   * Get a window to use for the browser console.
   *
   * (note that is is also used for browser toolbox and webextension
   *  i.e. all targets flagged with isRootActor=true)
   *
   * @private
   * @return nsIDOMWindow
   *         The window to use, or null if no window could be found.
   */
  _getWindowForBrowserConsole() {
    // Check if our last used chrome window is still live.
    let window = this._lastChromeWindow && this._lastChromeWindow.get();
    // If not, look for a new one.
    // In case of WebExtension reload of the background page, the last
    // chrome window might be a dead wrapper, from which we can't check for window.closed.
    if (!window || Cu.isDeadWrapper(window) || window.closed) {
      window = this.targetActor.window;
      if (!window) {
        // Try to find the Browser Console window to use instead.
        window = Services.wm.getMostRecentWindow("devtools:webconsole");
        // We prefer the normal chrome window over the console window,
        // so we'll look for those windows in order to replace our reference.
        const onChromeWindowOpened = () => {
          // We'll look for this window when someone next requests window()
          Services.obs.removeObserver(onChromeWindowOpened, "domwindowopened");
          this._lastChromeWindow = null;
        };
        Services.obs.addObserver(onChromeWindowOpened, "domwindowopened");
      }

      this._handleNewWindow(window);
    }

    return window;
  }

  /**
   * Store a newly found window on the actor to be used in the future.
   *
   * @private
   * @param nsIDOMWindow window
   *        The window to store on the actor (can be null).
   */
  _handleNewWindow(window) {
    if (window) {
      if (this._hadChromeWindow) {
        Services.console.logStringMessage("Webconsole context has changed");
      }
      this._lastChromeWindow = Cu.getWeakReference(window);
      this._hadChromeWindow = true;
    } else {
      this._lastChromeWindow = null;
    }
  }

  /**
   * Whether we've been using a window before.
   *
   * @private
   * @type boolean
   */
  _hadChromeWindow = false;

  /**
   * A weak reference to the last chrome window we used to work with.
   *
   * @private
   * @type nsIWeakReference
   */
  _lastChromeWindow = null;

  // The evalGlobal is used at the scope for JS evaluation.
  _evalGlobal = null;
  get evalGlobal() {
    return this._evalGlobal || this.global;
  }

  set evalGlobal(global) {
    this._evalGlobal = global;

    if (!this._progressListenerActive) {
      EventEmitter.on(this.targetActor, "will-navigate", this._onWillNavigate);
      this._progressListenerActive = true;
    }
  }

  /**
   * Flag used to track if we are listening for events from the progress
   * listener of the target actor. We use the progress listener to clear
   * this.evalGlobal on page navigation.
   *
   * @private
   * @type boolean
   */
  _progressListenerActive = false;

  /**
   * The ConsoleServiceListener instance.
   * @type object
   */
  consoleServiceListener = null;

  /**
   * The ConsoleAPIListener instance.
   */
  consoleAPIListener = null;

  /**
   * The ConsoleFileActivityListener instance.
   */
  consoleFileActivityListener = null;

  /**
   * The ConsoleReflowListener instance.
   */
  consoleReflowListener = null;

  grip() {
    return { actor: this.actorID };
  }

  _findProtoChain = ThreadActor.prototype._findProtoChain;
  _removeFromProtoChain = ThreadActor.prototype._removeFromProtoChain;

  /**
   * Destroy the current WebConsoleActor instance.
   */
  destroy() {
    this.stopListeners();
    super.destroy();

    EventEmitter.off(
      this.targetActor,
      "changed-toplevel-document",
      this._onChangedToplevelDocument
    );

    this._lastConsoleInputEvaluation = null;
    this._evalGlobal = null;
    this.dbg = null;
  }

  /**
   * Create a grip for the given value.
   *
   * @param mixed value
   * @return object
   */
  createValueGrip(value) {
    return createValueGrip(
      this.targetActor.threadActor,
      value,
      this.targetActor.objectsPool
    );
  }

  /**
   * Make a debuggee value for the given value.
   *
   * @param mixed value
   *        The value you want to get a debuggee value for.
   * @param boolean useObjectGlobal
   *        If |true| the object global is determined and added as a debuggee,
   *        otherwise |this.global| is used when makeDebuggeeValue() is invoked.
   * @return object
   *         Debuggee value for |value|.
   */
  makeDebuggeeValue(value, useObjectGlobal) {
    if (useObjectGlobal && isObject(value)) {
      try {
        const global = Cu.getGlobalForObject(value);
        const dbgGlobal = this.dbg.makeGlobalObjectReference(global);
        return dbgGlobal.makeDebuggeeValue(value);
      } catch (ex) {
        // The above can throw an exception if value is not an actual object
        // or 'Object in compartment marked as invisible to Debugger'
      }
    }
    const dbgGlobal = this.dbg.makeGlobalObjectReference(this.global);
    return dbgGlobal.makeDebuggeeValue(value);
  }

  /**
   * Create a grip for the given string.
   *
   * @param string string
   *        The string you want to create the grip for.
   * @param object pool
   *        A Pool where the new actor instance is added.
   * @return object
   *         A LongStringActor object that wraps the given string.
   */
  longStringGrip(string, pool) {
    const actor = new LongStringActor(this.conn, string);
    pool.manage(actor);
    return actor.form();
  }

  /**
   * Create a long string grip if needed for the given string.
   *
   * @private
   * @param string string
   *        The string you want to create a long string grip for.
   * @return string|object
   *         A string is returned if |string| is not a long string.
   *         A LongStringActor grip is returned if |string| is a long string.
   */
  _createStringGrip(string) {
    if (string && stringIsLong(string)) {
      return this.longStringGrip(string, this);
    }
    return string;
  }

  /**
   * Returns the latest web console input evaluation.
   * This is undefined if no evaluations have been completed.
   *
   * @return object
   */
  getLastConsoleInputEvaluation() {
    return this._lastConsoleInputEvaluation;
  }

  /**
   * Preprocess a debugger object (e.g. return the `boundTargetFunction`
   * debugger object if the given debugger object is a bound function).
   *
   * This method is called by both the `inspect` binding implemented
   * for the webconsole and the one implemented for the devtools API
   * `browser.devtools.inspectedWindow.eval`.
   */
  preprocessDebuggerObject(dbgObj) {
    // Returns the bound target function on a bound function.
    if (dbgObj?.isBoundFunction && dbgObj?.boundTargetFunction) {
      return dbgObj.boundTargetFunction;
    }

    return dbgObj;
  }

  /**
   * This helper is used by the WebExtensionInspectedWindowActor to
   * inspect an object in the developer toolbox.
   *
   * NOTE: shared parts related to preprocess the debugger object (between
   * this function and the `inspect` webconsole command defined in
   * "devtools/server/actor/webconsole/utils.js") should be added to
   * the webconsole actors' `preprocessDebuggerObject` method.
   */
  inspectObject(dbgObj, inspectFromAnnotation) {
    dbgObj = this.preprocessDebuggerObject(dbgObj);
    this.emit("inspectObject", {
      objectActor: this.createValueGrip(dbgObj),
      inspectFromAnnotation,
    });
  }

  // Request handlers for known packet types.

  /**
   * Handler for the "startListeners" request.
   *
   * @param array listeners
   *        An array of events to start sent by the Web Console client.
   * @return object
   *        The response object which holds the startedListeners array.
   */
  // eslint-disable-next-line complexity
  async startListeners(listeners) {
    const startedListeners = [];
    const global = !this.targetActor.isRootActor ? this.global : null;
    const isTargetActorContentProcess =
      this.targetActor.targetType === Targets.TYPES.PROCESS;

    for (const event of listeners) {
      switch (event) {
        case "PageError":
          // Workers don't support this message type yet
          if (isWorker) {
            break;
          }
          if (!this.consoleServiceListener) {
            this.consoleServiceListener = new ConsoleServiceListener(
              global,
              this.onConsoleServiceMessage,
              {
                matchExactWindow: this.targetActor.ignoreSubFrames,
              }
            );
            this.consoleServiceListener.init();
          }
          startedListeners.push(event);
          break;
        case "ConsoleAPI":
          if (!this.consoleAPIListener) {
            // Create the consoleAPIListener
            // (and apply the filtering options defined in the parent actor).
            this.consoleAPIListener = new ConsoleAPIListener(
              global,
              this.onConsoleAPICall,
              {
                matchExactWindow: this.targetActor.ignoreSubFrames,
              }
            );
            this.consoleAPIListener.init();
          }
          startedListeners.push(event);
          break;
        case "NetworkActivity":
          // Workers don't support this message type
          if (isWorker) {
            break;
          }
          // Bug 1807650 removed this in favor of the new Watcher/Resources APIs
          const errorMessage =
            "NetworkActivity is no longer supported. " +
            "Instead use Watcher actor's watchResources and listen to NETWORK_EVENT resource";
          dump(errorMessage + "\n");
          throw new Error(errorMessage);
        case "FileActivity":
          // Workers don't support this message type
          if (isWorker) {
            break;
          }
          if (this.global instanceof Ci.nsIDOMWindow) {
            if (!this.consoleFileActivityListener) {
              this.consoleFileActivityListener =
                new ConsoleFileActivityListener(this.global, this);
            }
            this.consoleFileActivityListener.startMonitor();
            startedListeners.push(event);
          }
          break;
        case "ReflowActivity":
          // Workers don't support this message type
          if (isWorker) {
            break;
          }
          if (!this.consoleReflowListener) {
            this.consoleReflowListener = new ConsoleReflowListener(
              this.global,
              this
            );
          }
          startedListeners.push(event);
          break;
        case "DocumentEvents":
          // Workers don't support this message type
          if (isWorker || isTargetActorContentProcess) {
            break;
          }
          if (!this.documentEventsListener) {
            this.documentEventsListener = new DocumentEventsListener(
              this.targetActor
            );

            this.documentEventsListener.on("dom-loading", data =>
              this.onDocumentEvent("dom-loading", data)
            );
            this.documentEventsListener.on("dom-interactive", data =>
              this.onDocumentEvent("dom-interactive", data)
            );
            this.documentEventsListener.on("dom-complete", data =>
              this.onDocumentEvent("dom-complete", data)
            );

            this.documentEventsListener.listen();
          }
          startedListeners.push(event);
          break;
      }
    }

    // Update the live list of running listeners
    startedListeners.forEach(this._listeners.add, this._listeners);

    return {
      startedListeners,
    };
  }

  /**
   * Handler for the "stopListeners" request.
   *
   * @param array listeners
   *        An array of events to stop sent by the Web Console client.
   * @return object
   *        The response packet to send to the client: holds the
   *        stoppedListeners array.
   */
  stopListeners(listeners) {
    const stoppedListeners = [];

    // If no specific listeners are requested to be detached, we stop all
    // listeners.
    const eventsToDetach = listeners || [
      "PageError",
      "ConsoleAPI",
      "FileActivity",
      "ReflowActivity",
      "DocumentEvents",
    ];

    for (const event of eventsToDetach) {
      switch (event) {
        case "PageError":
          if (this.consoleServiceListener) {
            this.consoleServiceListener.destroy();
            this.consoleServiceListener = null;
          }
          stoppedListeners.push(event);
          break;
        case "ConsoleAPI":
          if (this.consoleAPIListener) {
            this.consoleAPIListener.destroy();
            this.consoleAPIListener = null;
          }
          stoppedListeners.push(event);
          break;
        case "FileActivity":
          if (this.consoleFileActivityListener) {
            this.consoleFileActivityListener.stopMonitor();
            this.consoleFileActivityListener = null;
          }
          stoppedListeners.push(event);
          break;
        case "ReflowActivity":
          if (this.consoleReflowListener) {
            this.consoleReflowListener.destroy();
            this.consoleReflowListener = null;
          }
          stoppedListeners.push(event);
          break;
        case "DocumentEvents":
          if (this.documentEventsListener) {
            this.documentEventsListener.destroy();
            this.documentEventsListener = null;
          }
          stoppedListeners.push(event);
          break;
      }
    }

    // Update the live list of running listeners
    stoppedListeners.forEach(this._listeners.delete, this._listeners);

    return { stoppedListeners };
  }

  /**
   * Handler for the "getCachedMessages" request. This method sends the cached
   * error messages and the window.console API calls to the client.
   *
   * @param array messageTypes
   *        An array of message types sent by the Web Console client.
   * @return object
   *         The response packet to send to the client: it holds the cached
   *         messages array.
   */
  getCachedMessages(messageTypes) {
    if (!messageTypes) {
      return {
        error: "missingParameter",
        message: "The messageTypes parameter is missing.",
      };
    }

    const messages = [];

    const consoleServiceCachedMessages =
      messageTypes.includes("PageError") || messageTypes.includes("LogMessage")
        ? this.consoleServiceListener?.getCachedMessages(
            !this.targetActor.isRootActor
          )
        : null;

    for (const type of messageTypes) {
      switch (type) {
        case "ConsoleAPI": {
          if (!this.consoleAPIListener) {
            break;
          }

          // this.global might not be a window (can be a worker global or a Sandbox),
          // and in such case performance isn't defined
          const winStartTime =
            this.global?.performance?.timing?.navigationStart;

          const cache = this.consoleAPIListener.getCachedMessages(
            !this.targetActor.isRootActor
          );
          cache.forEach(cachedMessage => {
            // Filter out messages that came from a ServiceWorker but happened
            // before the page was requested.
            if (
              cachedMessage.innerID === "ServiceWorker" &&
              winStartTime > cachedMessage.timeStamp
            ) {
              return;
            }

            messages.push({
              message: this.prepareConsoleMessageForRemote(cachedMessage),
              type: "consoleAPICall",
            });
          });
          break;
        }

        case "PageError": {
          if (!consoleServiceCachedMessages) {
            break;
          }

          for (const cachedMessage of consoleServiceCachedMessages) {
            if (!(cachedMessage instanceof Ci.nsIScriptError)) {
              continue;
            }

            messages.push({
              pageError: this.preparePageErrorForRemote(cachedMessage),
              type: "pageError",
            });
          }
          break;
        }

        case "LogMessage": {
          if (!consoleServiceCachedMessages) {
            break;
          }

          for (const cachedMessage of consoleServiceCachedMessages) {
            if (cachedMessage instanceof Ci.nsIScriptError) {
              continue;
            }

            messages.push({
              message: this._createStringGrip(cachedMessage.message),
              timeStamp: cachedMessage.microSecondTimeStamp / 1000,
              type: "logMessage",
            });
          }
          break;
        }
      }
    }

    return {
      messages,
    };
  }

  /**
   * Handler for the "evaluateJSAsync" request. This method evaluates a given
   * JavaScript string with an associated `resultID`.
   *
   * The result will be returned later as an unsolicited `evaluationResult`,
   * that can be associated back to this request via the `resultID` field.
   *
   * @param object request
   *        The JSON request object received from the Web Console client.
   * @return object
   *         The response packet to send to with the unique id in the
   *         `resultID` field.
   */
  async evaluateJSAsync(request) {
    const startTime = ChromeUtils.dateNow();
    // Use  a timestamp instead of a UUID as this code is used by workers, which
    // don't have access to the UUID XPCOM component.
    // Also use a counter in order to prevent mixing up response when calling
    // at the exact same time.
    const resultID = startTime + "-" + this._evalCounter++;

    // Execute the evaluation in the next event loop in order to immediately
    // reply with the resultID.
    //
    // The console input should be evaluated with micro task level != 0,
    // so that microtask checkpoint isn't performed while evaluating it.
    DevToolsUtils.executeSoonWithMicroTask(async () => {
      try {
        // Execute the script that may pause.
        let response = await this.evaluateJS(request);
        // Wait for any potential returned Promise.
        response = await this._maybeWaitForResponseResult(response);

        // Set the timestamp only now, so any messages logged in the expression (e.g. console.log)
        // can be appended before the result message (unlike the evaluation result, other
        // console resources are throttled before being handled by the webconsole client,
        // which might cause some ordering issue).
        // Use ChromeUtils.dateNow() as it gives us a higher precision than Date.now().
        response.timestamp = ChromeUtils.dateNow();
        // Finally, emit an unsolicited evaluationResult packet with the evaluation result.
        this.emit("evaluationResult", {
          type: "evaluationResult",
          resultID,
          startTime,
          ...response,
        });
      } catch (e) {
        const message = `Encountered error while waiting for Helper Result: ${e}\n${e.stack}`;
        DevToolsUtils.reportException("evaluateJSAsync", Error(message));
      }
    });
    return { resultID };
  }

  /**
   * In order to support async evaluations (e.g. top-level await, …),
   * we have to be able to handle promises. This method handles waiting for the promise,
   * and then returns the result.
   *
   * @private
   * @param object response
   *         The response packet to send to with the unique id in the
   *         `resultID` field, and potentially a promise in the `helperResult` or in the
   *         `awaitResult` field.
   *
   * @return object
   *         The updated response object.
   */
  async _maybeWaitForResponseResult(response) {
    if (!response?.awaitResult) {
      return response;
    }

    let result;
    try {
      result = await response.awaitResult;

      // `createValueGrip` expect a debuggee value, while here we have the raw object.
      // We need to call `makeDebuggeeValue` on it to make it work.
      const dbgResult = this.makeDebuggeeValue(result);
      response.result = this.createValueGrip(dbgResult);
    } catch (e) {
      // The promise was rejected. We let the engine handle this as it will report a
      // `uncaught exception` error.
      response.topLevelAwaitRejected = true;
    }

    // Remove the promise from the response object.
    delete response.awaitResult;

    return response;
  }

  /**
   * Handler for the "evaluateJS" request. This method evaluates the given
   * JavaScript string and sends back the result.
   *
   * @param object request
   *        The JSON request object received from the Web Console client.
   * @return object
   *         The evaluation response packet.
   */
  evaluateJS(request) {
    const input = request.text;

    const evalOptions = {
      frameActor: request.frameActor,
      url: request.url,
      innerWindowID: request.innerWindowID,
      selectedNodeActor: request.selectedNodeActor,
      selectedObjectActor: request.selectedObjectActor,
      eager: request.eager,
      bindings: request.bindings,
      lineNumber: request.lineNumber,
      // This flag is set to true in most cases as we consider most evaluations as internal and:
      // * prevent any breakpoint from being triggerred when evaluating the JS input
      // * prevent spawning Debugger.Source for the evaluated JS and showing it in Debugger UI
      // This is only set to false when evaluating the console input.
      disableBreaks: !!request.disableBreaks,
      // Optional flag, to be set to true when Console Commands should override local symbols with
      // the same name. Like if the page defines `$`, the evaluated string will use the `$` implemented
      // by the console command instead of the page's function.
      preferConsoleCommandsOverLocalSymbols:
        !!request.preferConsoleCommandsOverLocalSymbols,
    };

    const { mapped } = request;

    // Set a flag on the thread actor which indicates an evaluation is being
    // done for the client. This is used to disable all types of breakpoints for all sources
    // via `disabledBreaks`. When this flag is used, `reportExceptionsWhenBreaksAreDisabled`
    // allows to still pause on exceptions.
    this.targetActor.threadActor.insideClientEvaluation = evalOptions;

    let evalInfo;
    try {
      evalInfo = evalWithDebugger(input, evalOptions, this);
    } finally {
      this.targetActor.threadActor.insideClientEvaluation = null;
    }

    return new Promise((resolve, reject) => {
      // Queue up a task to run in the next tick so any microtask created by the evaluated
      // expression has the time to be run.
      // e.g. in :
      // ```
      // const promiseThenCb = result => "result: " + result;
      // new Promise(res => res("hello")).then(promiseThenCb)
      // ```
      // we want`promiseThenCb` to have run before handling the result.
      DevToolsUtils.executeSoon(() => {
        try {
          const result = this.prepareEvaluationResult(
            evalInfo,
            input,
            request.eager,
            mapped,
            request.evalInTracer
          );
          resolve(result);
        } catch (err) {
          reject(err);
        }
      });
    });
  }

  // eslint-disable-next-line complexity
  prepareEvaluationResult(evalInfo, input, eager, mapped, evalInTracer) {
    const evalResult = evalInfo.result;
    const helperResult = evalInfo.helperResult;

    let result,
      errorDocURL,
      errorMessage,
      errorNotes = null,
      errorGrip = null,
      frame = null,
      awaitResult,
      errorMessageName,
      exceptionStack;
    if (evalResult) {
      if ("return" in evalResult) {
        result = evalResult.return;
        if (
          mapped?.await &&
          result &&
          result.class === "Promise" &&
          typeof result.unsafeDereference === "function"
        ) {
          awaitResult = result.unsafeDereference();
        }
      } else if ("yield" in evalResult) {
        result = evalResult.yield;
      } else if ("throw" in evalResult) {
        const error = evalResult.throw;
        errorGrip = this.createValueGrip(error);

        exceptionStack = this.prepareStackForRemote(evalResult.stack);

        if (exceptionStack) {
          // Set the frame based on the topmost stack frame for the exception.
          const {
            filename: source,
            sourceId,
            lineNumber: line,
            columnNumber: column,
          } = exceptionStack[0];
          frame = { source, sourceId, line, column };

          exceptionStack =
            WebConsoleUtils.removeFramesAboveDebuggerEval(exceptionStack);
        }

        errorMessage = String(error);
        if (typeof error === "object" && error !== null) {
          try {
            errorMessage = DevToolsUtils.callPropertyOnObject(
              error,
              "toString"
            );
          } catch (e) {
            // If the debuggee is not allowed to access the "toString" property
            // of the error object, calling this property from the debuggee's
            // compartment will fail. The debugger should show the error object
            // as it is seen by the debuggee, so this behavior is correct.
            //
            // Unfortunately, we have at least one test that assumes calling the
            // "toString" property of an error object will succeed if the
            // debugger is allowed to access it, regardless of whether the
            // debuggee is allowed to access it or not.
            //
            // To accomodate these tests, if calling the "toString" property
            // from the debuggee compartment fails, we rewrap the error object
            // in the debugger's compartment, and then call the "toString"
            // property from there.
            if (typeof error.unsafeDereference === "function") {
              const rawError = error.unsafeDereference();
              errorMessage = rawError ? rawError.toString() : "";
            }
          }
        }

        // It is possible that we won't have permission to unwrap an
        // object and retrieve its errorMessageName.
        try {
          errorDocURL = ErrorDocs.GetURL(error);
          errorMessageName = error.errorMessageName;
        } catch (ex) {
          // ignored
        }

        try {
          const line = error.errorLineNumber;
          const column = error.errorColumnNumber;

          if (typeof line === "number" && typeof column === "number") {
            // Set frame only if we have line/column numbers.
            frame = {
              source: "debugger eval code",
              line,
              column,
            };
          }
        } catch (ex) {
          // ignored
        }

        try {
          const notes = error.errorNotes;
          if (notes?.length) {
            errorNotes = [];
            for (const note of notes) {
              errorNotes.push({
                messageBody: this._createStringGrip(note.message),
                frame: {
                  source: note.fileName,
                  line: note.lineNumber,
                  column: note.columnNumber,
                },
              });
            }
          }
        } catch (ex) {
          // ignored
        }
      }
    }
    // If a value is encountered that the devtools server doesn't support yet,
    // the console should remain functional.
    let resultGrip;
    if (!awaitResult) {
      try {
        const objectActor =
          this.targetActor.threadActor.getThreadLifetimeObject(result);
        if (evalInTracer) {
          const tracerActor = this.targetActor.getTargetScopedActor("tracer");
          resultGrip = tracerActor.createValueGrip(result);
        } else if (objectActor) {
          resultGrip = this.targetActor.threadActor.createValueGrip(result);
        } else {
          resultGrip = this.createValueGrip(result);
        }
      } catch (e) {
        errorMessage = e;
      }
    }

    // Don't update _lastConsoleInputEvaluation in eager evaluation, as it would interfere
    // with the $_ command.
    if (!eager) {
      if (!awaitResult) {
        this._lastConsoleInputEvaluation = result;
      } else {
        // If we evaluated a top-level await expression, we want to assign its result to the
        // _lastConsoleInputEvaluation only when the promise resolves, and only if it
        // resolves. If the promise rejects, we don't re-assign _lastConsoleInputEvaluation,
        // it will keep its previous value.

        const p = awaitResult.then(res => {
          this._lastConsoleInputEvaluation = this.makeDebuggeeValue(res);
        });

        // If the top level await was already rejected (e.g. `await Promise.reject("bleh")`),
        // catch the resulting promise of awaitResult.then.
        // If we don't do that, the new Promise will also be rejected, and since it's
        // unhandled, it will generate an error.
        // We don't want to do that for pending promise (e.g. `await new Promise((res, rej) => setTimeout(rej,250))`),
        // as the the Promise rejection will be considered as handled, and the "Uncaught (in promise)"
        // message wouldn't be emitted.
        const { state } = ObjectUtils.getPromiseState(evalResult.return);
        if (state === "rejected") {
          p.catch(() => {});
        }
      }
    }

    return {
      input,
      result: resultGrip,
      awaitResult,
      exception: errorGrip,
      exceptionMessage: this._createStringGrip(errorMessage),
      exceptionDocURL: errorDocURL,
      exceptionStack,
      hasException: errorGrip !== null,
      errorMessageName,
      frame,
      helperResult,
      notes: errorNotes,
    };
  }

  /**
   * The Autocomplete request handler.
   *
   * @param string text
   *        The request message - what input to autocomplete.
   * @param number cursor
   *        The cursor position at the moment of starting autocomplete.
   * @param string frameActor
   *        The frameactor id of the current paused frame.
   * @param string selectedNodeActor
   *        The actor id of the currently selected node.
   * @param array authorizedEvaluations
   *        Array of the properties access which can be executed by the engine.
   * @return object
   *         The response message - matched properties.
   */
  autocomplete(
    text,
    cursor,
    frameActorId,
    selectedNodeActor,
    authorizedEvaluations,
    expressionVars = []
  ) {
    let dbgObject = null;
    let environment = null;
    let matches = [];
    let matchProp;
    let isElementAccess;

    const reqText = text.substr(0, cursor);

    if (isCommand(reqText)) {
      matchProp = reqText;
      matches = WebConsoleCommandsManager.getAllColonCommandNames()
        .filter(c => `:${c}`.startsWith(reqText))
        .map(c => `:${c}`);
    } else {
      // This is the case of the paused debugger
      if (frameActorId) {
        const frameActor = this.conn.getActor(frameActorId);
        try {
          // Need to try/catch since accessing frame.environment
          // can throw "Debugger.Frame is not live"
          const frame = frameActor.frame;
          environment = frame.environment;
        } catch (e) {
          DevToolsUtils.reportException(
            "autocomplete",
            Error("The frame actor was not found: " + frameActorId)
          );
        }
      } else {
        dbgObject = this.dbg.addDebuggee(this.evalGlobal);
      }

      const result = jsPropertyProvider({
        dbgObject,
        environment,
        frameActorId,
        inputValue: text,
        cursor,
        webconsoleActor: this,
        selectedNodeActor,
        authorizedEvaluations,
        expressionVars,
      });

      if (result === null) {
        return {
          matches: null,
        };
      }

      if (result && result.isUnsafeGetter === true) {
        return {
          isUnsafeGetter: true,
          getterPath: result.getterPath,
        };
      }

      matches = result.matches || new Set();
      matchProp = result.matchProp || "";
      isElementAccess = result.isElementAccess;

      // We consider '$' as alphanumeric because it is used in the names of some
      // helper functions; we also consider whitespace as alphanum since it should not
      // be seen as break in the evaled string.
      const lastNonAlphaIsDot = /[.][a-zA-Z0-9$\s]*$/.test(reqText);

      // We only return commands and keywords when we are not dealing with a property or
      // element access.
      if (matchProp && !lastNonAlphaIsDot && !isElementAccess) {
        const colonOnlyCommands =
          WebConsoleCommandsManager.getColonOnlyCommandNames();
        for (const name of WebConsoleCommandsManager.getAllCommandNames()) {
          // Filter out commands like `screenshot` as it is inaccessible without the `:` prefix
          if (
            !colonOnlyCommands.includes(name) &&
            name.startsWith(result.matchProp)
          ) {
            matches.add(name);
          }
        }

        for (const keyword of RESERVED_JS_KEYWORDS) {
          if (keyword.startsWith(result.matchProp)) {
            matches.add(keyword);
          }
        }
      }

      // Sort the results in order to display lowercased item first (e.g. we want to
      // display `document` then `Document` as we loosely match the user input if the
      // first letter was lowercase).
      const firstMeaningfulCharIndex = isElementAccess ? 1 : 0;
      matches = Array.from(matches).sort((a, b) => {
        const aFirstMeaningfulChar = a[firstMeaningfulCharIndex];
        const bFirstMeaningfulChar = b[firstMeaningfulCharIndex];
        const lA =
          aFirstMeaningfulChar.toLocaleLowerCase() === aFirstMeaningfulChar;
        const lB =
          bFirstMeaningfulChar.toLocaleLowerCase() === bFirstMeaningfulChar;
        if (lA === lB) {
          if (a === matchProp) {
            return -1;
          }
          if (b === matchProp) {
            return 1;
          }
          return a.localeCompare(b);
        }
        return lA ? -1 : 1;
      });
    }

    return {
      matches,
      matchProp,
      isElementAccess: isElementAccess === true,
    };
  }

  /**
   * The "clearMessagesCacheAsync" request handler.
   */
  clearMessagesCacheAsync() {
    if (isWorker) {
      // Defined on WorkerScope
      clearConsoleEvents();
      return;
    }

    const windowId = !this.targetActor.isRootActor
      ? WebConsoleUtils.getInnerWindowId(this.global)
      : null;

    const ConsoleAPIStorage = Cc[
      "@mozilla.org/consoleAPI-storage;1"
    ].getService(Ci.nsIConsoleAPIStorage);
    ConsoleAPIStorage.clearEvents(windowId);

    CONSOLE_WORKER_IDS.forEach(id => {
      ConsoleAPIStorage.clearEvents(id);
    });

    if (this.targetActor.isRootActor || !this.global) {
      // If were dealing with the root actor (e.g. the browser console), we want
      // to remove all cached messages, not only the ones specific to a window.
      Services.console.reset();
    } else if (this.targetActor.ignoreSubFrames) {
      Services.console.resetWindow(windowId);
    } else {
      WebConsoleUtils.getInnerWindowIDsForFrames(this.global).forEach(id =>
        Services.console.resetWindow(id)
      );
    }
  }

  // End of request handlers.

  // Event handlers for various listeners.

  /**
   * Handler for messages received from the ConsoleServiceListener. This method
   * sends the nsIConsoleMessage to the remote Web Console client.
   *
   * @param nsIConsoleMessage message
   *        The message we need to send to the client.
   */
  onConsoleServiceMessage(message) {
    if (message instanceof Ci.nsIScriptError) {
      this.emit("pageError", {
        pageError: this.preparePageErrorForRemote(message),
      });
    } else {
      this.emit("logMessage", {
        message: this._createStringGrip(message.message),
        timeStamp: message.microSecondTimeStamp / 1000,
      });
    }
  }

  getActorIdForInternalSourceId(id) {
    const actor =
      this.targetActor.sourcesManager.getSourceActorByInternalSourceId(id);
    return actor ? actor.actorID : null;
  }

  /**
   * Prepare a SavedFrame stack to be sent to the client.
   *
   * @param SavedFrame errorStack
   *        Stack for an error we need to send to the client.
   * @return object
   *         The object you can send to the remote client.
   */
  prepareStackForRemote(errorStack) {
    // Convert stack objects to the JSON attributes expected by client code
    // Bug 1348885: If the global from which this error came from has been
    // nuked, stack is going to be a dead wrapper.
    if (!errorStack || (Cu && Cu.isDeadWrapper(errorStack))) {
      return null;
    }
    const stack = [];
    let s = errorStack;
    while (s) {
      stack.push({
        filename: s.source,
        sourceId: this.getActorIdForInternalSourceId(s.sourceId),
        lineNumber: s.line,
        columnNumber: s.column,
        functionName: s.functionDisplayName,
        asyncCause: s.asyncCause ? s.asyncCause : undefined,
      });
      s = s.parent || s.asyncParent;
    }
    return stack;
  }

  /**
   * Prepare an nsIScriptError to be sent to the client.
   *
   * @param nsIScriptError pageError
   *        The page error we need to send to the client.
   * @return object
   *         The object you can send to the remote client.
   */
  preparePageErrorForRemote(pageError) {
    const stack = this.prepareStackForRemote(pageError.stack);
    let notesArray = null;
    const notes = pageError.notes;
    if (notes?.length) {
      notesArray = [];
      for (let i = 0, len = notes.length; i < len; i++) {
        const note = notes.queryElementAt(i, Ci.nsIScriptErrorNote);
        notesArray.push({
          messageBody: this._createStringGrip(note.errorMessage),
          frame: {
            source: note.sourceName,
            sourceId: this.getActorIdForInternalSourceId(note.sourceId),
            line: note.lineNumber,
            column: note.columnNumber,
          },
        });
      }
    }

    // If there is no location information in the error but we have a stack,
    // fill in the location with the first frame on the stack.
    let { sourceName, sourceId, lineNumber, columnNumber } = pageError;
    if (!sourceName && !sourceId && !lineNumber && !columnNumber && stack) {
      sourceName = stack[0].filename;
      sourceId = stack[0].sourceId;
      lineNumber = stack[0].lineNumber;
      columnNumber = stack[0].columnNumber;
    }

    const isCSSMessage = pageError.category === MESSAGE_CATEGORY.CSS_PARSER;

    const result = {
      errorMessage: this._createStringGrip(pageError.errorMessage),
      errorMessageName: isCSSMessage ? undefined : pageError.errorMessageName,
      exceptionDocURL: ErrorDocs.GetURL(pageError),
      sourceName,
      sourceId: this.getActorIdForInternalSourceId(sourceId),
      lineNumber,
      columnNumber,
      category: pageError.category,
      innerWindowID: pageError.innerWindowID,
      timeStamp: pageError.microSecondTimeStamp / 1000,
      warning: !!(pageError.flags & pageError.warningFlag),
      error: !(pageError.flags & (pageError.warningFlag | pageError.infoFlag)),
      info: !!(pageError.flags & pageError.infoFlag),
      private: pageError.isFromPrivateWindow,
      stacktrace: stack,
      notes: notesArray,
      chromeContext: pageError.isFromChromeContext,
      isPromiseRejection: isCSSMessage
        ? undefined
        : pageError.isPromiseRejection,
      isForwardedFromContentProcess: pageError.isForwardedFromContentProcess,
      cssSelectors: isCSSMessage ? pageError.cssSelectors : undefined,
    };

    // If the pageError does have an exception object, we want to return the grip for it,
    // but only if we do manage to get the grip, as we're checking the property on the
    // client to render things differently.
    if (pageError.hasException) {
      try {
        const obj = this.makeDebuggeeValue(pageError.exception, true);
        if (obj?.class !== "DeadObject") {
          result.exception = this.createValueGrip(obj);
          result.hasException = true;
        }
      } catch (e) {}
    }

    return result;
  }

  /**
   * Handler for window.console API calls received from the ConsoleAPIListener.
   * This method sends the object to the remote Web Console client.
   *
   * @see ConsoleAPIListener
   * @param object message
   *        The console API call we need to send to the remote client.
   * @param object extraProperties
   *        an object whose properties will be folded in the packet that is emitted.
   */
  onConsoleAPICall(message, extraProperties = {}) {
    this.emit("consoleAPICall", {
      message: this.prepareConsoleMessageForRemote(message),
      ...extraProperties,
    });
  }

  /**
   * Handler for the DocumentEventsListener.
   *
   * @see DocumentEventsListener
   * @param {String} name
   *        The document event name that either of followings.
   *        - dom-loading
   *        - dom-interactive
   *        - dom-complete
   * @param {Number} time
   *        The time that the event is fired.
   * @param {Boolean} hasNativeConsoleAPI
   *        Tells if the window.console object is native or overwritten by script in the page.
   *        Only passed when `name` is "dom-complete" (see devtools/server/actors/webconsole/listeners/document-events.js).
   */
  onDocumentEvent(name, { time, hasNativeConsoleAPI }) {
    this.emit("documentEvent", {
      name,
      time,
      hasNativeConsoleAPI,
    });
  }

  /**
   * Handler for file activity. This method sends the file request information
   * to the remote Web Console client.
   *
   * @see ConsoleFileActivityListener
   * @param string fileURI
   *        The requested file URI.
   */
  onFileActivity(fileURI) {
    this.emit("fileActivity", {
      uri: fileURI,
    });
  }

  // End of event handlers for various listeners.

  /**
   * Prepare a message from the console API to be sent to the remote Web Console
   * instance.
   *
   * @param object message
   *        The original message received from the console storage listener.
   * @param boolean aUseObjectGlobal
   *        If |true| the object global is determined and added as a debuggee,
   *        otherwise |this.global| is used when makeDebuggeeValue() is invoked.
   * @return object
   *         The object that can be sent to the remote client.
   */
  prepareConsoleMessageForRemote(message, useObjectGlobal = true) {
    const result = {
      arguments: message.arguments
        ? message.arguments.map(obj => {
            const dbgObj = this.makeDebuggeeValue(obj, useObjectGlobal);
            return this.createValueGrip(dbgObj);
          })
        : [],
      chromeContext: message.chromeContext,
      columnNumber: message.columnNumber,
      filename: message.filename,
      level: message.level,
      lineNumber: message.lineNumber,
      // messages emitted from Console.sys.mjs don't have a microSecondTimeStamp property
      timeStamp: message.microSecondTimeStamp
        ? message.microSecondTimeStamp / 1000
        : message.timeStamp,
      sourceId: this.getActorIdForInternalSourceId(message.sourceId),
      category: message.category || "webdev",
      innerWindowID: message.innerID,
    };

    // It only make sense to include the following properties in the message when they have
    // a meaningful value. Otherwise we simply don't include them so we save cycles in JSActor communication.
    if (message.counter) {
      result.counter = message.counter;
    }
    if (message.private) {
      result.private = message.private;
    }
    if (message.prefix) {
      result.prefix = message.prefix;
    }

    if (message.stacktrace) {
      result.stacktrace = message.stacktrace.map(frame => {
        return {
          ...frame,
          sourceId: this.getActorIdForInternalSourceId(frame.sourceId),
        };
      });
    }

    if (message.styles && message.styles.length) {
      result.styles = message.styles.map(string => {
        return this.createValueGrip(string);
      });
    }

    if (message.timer) {
      result.timer = message.timer;
    }

    if (message.level === "table") {
      const tableItems = this._getConsoleTableMessageItems(result);
      if (tableItems) {
        result.arguments[0].ownProperties = tableItems;
        result.arguments[0].preview = null;
      }

      // Only return the 2 first params.
      result.arguments = result.arguments.slice(0, 2);
    }

    return result;
  }

  /**
   * Return the properties needed to display the appropriate table for a given
   * console.table call.
   * This function does a little more than creating an ObjectActor for the first
   * parameter of the message. When layout out the console table in the output, we want
   * to be able to look into sub-properties so the table can have a different layout (
   * for arrays of arrays, objects with objects properties, arrays of objects, …).
   * So here we need to retrieve the properties of the first parameter, and also all the
   * sub-properties we might need.
   *
   * @param {Object} result: The console.table message.
   * @returns {Object} An object containing the properties of the first argument of the
   *                   console.table call.
   */
  _getConsoleTableMessageItems(result) {
    if (
      !result ||
      !Array.isArray(result.arguments) ||
      !result.arguments.length
    ) {
      return null;
    }

    const [tableItemGrip] = result.arguments;
    const dataType = tableItemGrip.class;
    const needEntries = ["Map", "WeakMap", "Set", "WeakSet"].includes(dataType);
    const ignoreNonIndexedProperties = isArray(tableItemGrip);

    const tableItemActor = this.targetActor.objectsPool.getActorByID(
      tableItemGrip.actor
    );
    if (!tableItemActor) {
      return null;
    }

    // Retrieve the properties (or entries for Set/Map) of the console table first arg.
    const iterator = needEntries
      ? tableItemActor.enumEntries()
      : tableItemActor.enumProperties({
          ignoreNonIndexedProperties,
        });
    const { ownProperties } = iterator.all();

    // The iterator returns a descriptor for each property, wherein the value could be
    // in one of those sub-property.
    const descriptorKeys = ["safeGetterValues", "getterValue", "value"];

    Object.values(ownProperties).forEach(desc => {
      if (typeof desc !== "undefined") {
        descriptorKeys.forEach(key => {
          if (desc && desc.hasOwnProperty(key)) {
            const grip = desc[key];

            // We need to load sub-properties as well to render the table in a nice way.
            const actor =
              grip && this.targetActor.objectsPool.getActorByID(grip.actor);
            if (actor) {
              const res = actor
                .enumProperties({
                  ignoreNonIndexedProperties: isArray(grip),
                })
                .all();
              if (res?.ownProperties) {
                desc[key].ownProperties = res.ownProperties;
              }
            }
          }
        });
      }
    });

    return ownProperties;
  }

  /**
   * The "will-navigate" progress listener. This is used to clear the current
   * eval scope.
   */
  _onWillNavigate({ isTopLevel }) {
    if (isTopLevel) {
      this._evalGlobal = null;
      EventEmitter.off(this.targetActor, "will-navigate", this._onWillNavigate);
      this._progressListenerActive = false;
    }
  }

  /**
   * This listener is called when we switch to another frame,
   * mostly to unregister previous listeners and start listening on the new document.
   */
  _onChangedToplevelDocument() {
    // Convert the Set to an Array
    const listeners = [...this._listeners];

    // Unregister existing listener on the previous document
    // (pass a copy of the array as it will shift from it)
    this.stopListeners(listeners.slice());

    // This method is called after this.global is changed,
    // so we register new listener on this new global
    this.startListeners(listeners);

    // Also reset the cached top level chrome window being targeted
    this._lastChromeWindow = null;
  }
}

exports.WebConsoleActor = WebConsoleActor;

quality90%

¤ Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.0.55Bemerkung: (vorverarbeitet) ¤

*Bot Zugriff

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.