/* 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";

ChromeUtils.defineModuleGetter(
  this,
  "WebRequest",
  "resource://gre/modules/WebRequest.jsm"
);

var { parseMatchPatterns } = ExtensionUtils;

// The guts of a WebRequest event handler.  Takes care of converting
// |details| parameter when invoking listeners.
function registerEvent(
  extension,
  eventName,
  fire,
  filter,
  info,
  remoteTab = null
) {
  let listener = async data => {
    let event = data.serialize(eventName);
    if (data.registerTraceableChannel) {
      // If this is a primed listener, no tabParent was passed in here,
      // but the convert() callback later in this function will be called
      // when the background page is started.  Force that to happen here
      // after which we'll have a valid tabParent.
      if (fire.wakeup) {
        await fire.wakeup();
      }
      data.registerTraceableChannel(extension.policy, remoteTab);
    }

    return fire.sync(event);
  };

  let filter2 = {};
  if (filter.urls) {
    let perms = new MatchPatternSet([
      ...extension.allowedOrigins.patterns,
      ...extension.optionalOrigins.patterns,
    ]);

    filter2.urls = parseMatchPatterns(filter.urls);

    if (!perms.overlapsAll(filter2.urls)) {
      Cu.reportError(
        "The webRequest.addListener filter doesn't overlap with host permissions."
      );
    }
  }
  if (filter.types) {
    filter2.types = filter.types;
  }
  if (filter.tabId !== undefined) {
    filter2.tabId = filter.tabId;
  }
  if (filter.windowId !== undefined) {
    filter2.windowId = filter.windowId;
  }
  if (filter.incognito !== undefined) {
    filter2.incognito = filter.incognito;
  }

  let blockingAllowed = extension.hasPermission("webRequestBlocking");

  let info2 = [];
  if (info) {
    for (let desc of info) {
      if (desc == "blocking" && !blockingAllowed) {
        // This is usually checked in the child process (based on the API schemas, where these options
        // should be checked with the "webRequestBlockingPermissionRequired" postprocess property),
        // but it is worth to also check it here just in case a new webRequest has been added and
        // it has not yet using the expected postprocess property).
        Cu.reportError(
          "Using webRequest.addListener with the blocking option " +
            "requires the 'webRequestBlocking' permission."
        );
      } else {
        info2.push(desc);
      }
    }
  }

  let listenerDetails = {
    addonId: extension.id,
    policy: extension.policy,
    blockingAllowed,
  };
  WebRequest[eventName].addListener(listener, filter2, info2, listenerDetails);

  return {
    unregister: () => {
      WebRequest[eventName].removeListener(listener);
    },
    convert(_fire, context) {
      fire = _fire;
      remoteTab = context.xulBrowser.frameLoader.remoteTab;
    },
  };
}

function makeWebRequestEvent(context, name) {
  return new EventManager({
    context,
    name: `webRequest.${name}`,
    persistent: {
      module: "webRequest",
      event: name,
    },
    register: (fire, filter, info) => {
      return registerEvent(
        context.extension,
        name,
        fire,
        filter,
        info,
        context.xulBrowser.frameLoader.remoteTab
      ).unregister;
    },
  }).api();
}

this.webRequest = class extends ExtensionAPI {
  primeListener(extension, event, fire, params) {
    return registerEvent(extension, event, fire, ...params);
  }

  getAPI(context) {
    return {
      webRequest: {
        onBeforeRequest: makeWebRequestEvent(context, "onBeforeRequest"),
        onBeforeSendHeaders: makeWebRequestEvent(
          context,
          "onBeforeSendHeaders"
        ),
        onSendHeaders: makeWebRequestEvent(context, "onSendHeaders"),
        onHeadersReceived: makeWebRequestEvent(context, "onHeadersReceived"),
        onAuthRequired: makeWebRequestEvent(context, "onAuthRequired"),
        onBeforeRedirect: makeWebRequestEvent(context, "onBeforeRedirect"),
        onResponseStarted: makeWebRequestEvent(context, "onResponseStarted"),
        onErrorOccurred: makeWebRequestEvent(context, "onErrorOccurred"),
        onCompleted: makeWebRequestEvent(context, "onCompleted"),
        getSecurityInfo: function(requestId, options = {}) {
          return WebRequest.getSecurityInfo({
            id: requestId,
            policy: context.extension.policy,
            remoteTab: context.xulBrowser.frameLoader.remoteTab,
            options,
          });
        },
        handlerBehaviorChanged: function() {
          // TODO: Flush all caches.
        },
      },
    };
  }
};