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NetworkManager.ts
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NetworkManager.ts
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/**
* Copyright 2017 Google Inc. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import { ProtocolMapping } from 'devtools-protocol/types/protocol-mapping.js';
import { EventEmitter } from './EventEmitter.js';
import { Frame } from './FrameManager.js';
import { assert } from './assert.js';
import { helper, debugError } from './helper.js';
import { Protocol } from 'devtools-protocol';
import { HTTPRequest } from './HTTPRequest.js';
import { HTTPResponse } from './HTTPResponse.js';
/**
* @public
*/
export interface Credentials {
username: string;
password: string;
}
/**
* @public
*/
export interface NetworkConditions {
// Download speed (bytes/s)
download: number;
// Upload speed (bytes/s)
upload: number;
// Latency (ms)
latency: number;
}
/**
* @public
*/
export interface InternalNetworkConditions extends NetworkConditions {
offline: boolean;
}
/**
* We use symbols to prevent any external parties listening to these events.
* They are internal to Puppeteer.
*
* @internal
*/
export const NetworkManagerEmittedEvents = {
Request: Symbol('NetworkManager.Request'),
RequestServedFromCache: Symbol('NetworkManager.RequestServedFromCache'),
Response: Symbol('NetworkManager.Response'),
RequestFailed: Symbol('NetworkManager.RequestFailed'),
RequestFinished: Symbol('NetworkManager.RequestFinished'),
} as const;
interface CDPSession extends EventEmitter {
send<T extends keyof ProtocolMapping.Commands>(
method: T,
...paramArgs: ProtocolMapping.Commands[T]['paramsType']
): Promise<ProtocolMapping.Commands[T]['returnType']>;
}
interface FrameManager {
frame(frameId: string): Frame | null;
}
/**
* @internal
*/
export class NetworkManager extends EventEmitter {
_client: CDPSession;
_ignoreHTTPSErrors: boolean;
_frameManager: FrameManager;
/*
* There are four possible orders of events:
* A. `_onRequestWillBeSent`
* B. `_onRequestWillBeSent`, `_onRequestPaused`
* C. `_onRequestPaused`, `_onRequestWillBeSent`
* D. `_onRequestPaused`, `_onRequestWillBeSent`, `_onRequestPaused`
* (see crbug.com/1196004)
*
* For `_onRequest` we need the event from `_onRequestWillBeSent` and
* optionally the `interceptionId` from `_onRequestPaused`.
*
* If request interception is disabled, call `_onRequest` once per call to
* `_onRequestWillBeSent`.
* If request interception is enabled, call `_onRequest` once per call to
* `_onRequestPaused` (once per `interceptionId`).
*
* Events are stored to allow for subsequent events to call `_onRequest`.
*
* Note that (chains of) redirect requests have the same `requestId` (!) as
* the original request. We have to anticipate series of events like these:
* A. `_onRequestWillBeSent`,
* `_onRequestWillBeSent`, ...
* B. `_onRequestWillBeSent`, `_onRequestPaused`,
* `_onRequestWillBeSent`, `_onRequestPaused`, ...
* C. `_onRequestWillBeSent`, `_onRequestPaused`,
* `_onRequestPaused`, `_onRequestWillBeSent`, ...
* D. `_onRequestPaused`, `_onRequestWillBeSent`,
* `_onRequestPaused`, `_onRequestWillBeSent`, `_onRequestPaused`, ...
* (see crbug.com/1196004)
*/
_requestIdToRequestWillBeSentEvent = new Map<
string,
Protocol.Network.RequestWillBeSentEvent
>();
_requestIdToRequestPausedEvent = new Map<
string,
Protocol.Fetch.RequestPausedEvent
>();
_requestIdToRequest = new Map<string, HTTPRequest>();
/*
* The below maps are used to reconcile Network.responseReceivedExtraInfo
* events with their corresponding request. Each response and redirect
* response gets an ExtraInfo event, and we don't know which will come first.
* This means that we have to store a Response or an ExtraInfo for each
* response, and emit the event when we get both of them. In addition, to
* handle redirects, we have to make them Arrays to represent the chain of
* events.
*/
_requestIdToResponseReceivedExtraInfo = new Map<
string,
Protocol.Network.ResponseReceivedExtraInfoEvent[]
>();
_requestIdToQueuedRedirectInfoMap = new Map<
string,
Array<{
event: Protocol.Network.RequestWillBeSentEvent;
interceptionId?: string;
}>
>();
_requestIdToQueuedEvents = new Map<
string,
{
responseReceived: Protocol.Network.ResponseReceivedEvent;
promise: Promise<void>;
resolver: () => void;
loadingFinished?: Protocol.Network.LoadingFinishedEvent;
loadingFailed?: Protocol.Network.LoadingFailedEvent;
}
>();
_extraHTTPHeaders: Record<string, string> = {};
_credentials?: Credentials = null;
_attemptedAuthentications = new Set<string>();
_userRequestInterceptionEnabled = false;
_protocolRequestInterceptionEnabled = false;
_userCacheDisabled = false;
_emulatedNetworkConditions: InternalNetworkConditions = {
offline: false,
upload: -1,
download: -1,
latency: 0,
};
constructor(
client: CDPSession,
ignoreHTTPSErrors: boolean,
frameManager: FrameManager
) {
super();
this._client = client;
this._ignoreHTTPSErrors = ignoreHTTPSErrors;
this._frameManager = frameManager;
this._client.on('Fetch.requestPaused', this._onRequestPaused.bind(this));
this._client.on('Fetch.authRequired', this._onAuthRequired.bind(this));
this._client.on(
'Network.requestWillBeSent',
this._onRequestWillBeSent.bind(this)
);
this._client.on(
'Network.requestServedFromCache',
this._onRequestServedFromCache.bind(this)
);
this._client.on(
'Network.responseReceived',
this._onResponseReceived.bind(this)
);
this._client.on(
'Network.loadingFinished',
this._onLoadingFinished.bind(this)
);
this._client.on('Network.loadingFailed', this._onLoadingFailed.bind(this));
this._client.on(
'Network.responseReceivedExtraInfo',
this._onResponseReceivedExtraInfo.bind(this)
);
}
async initialize(): Promise<void> {
await this._client.send('Network.enable');
if (this._ignoreHTTPSErrors)
await this._client.send('Security.setIgnoreCertificateErrors', {
ignore: true,
});
}
async authenticate(credentials?: Credentials): Promise<void> {
this._credentials = credentials;
await this._updateProtocolRequestInterception();
}
async setExtraHTTPHeaders(
extraHTTPHeaders: Record<string, string>
): Promise<void> {
this._extraHTTPHeaders = {};
for (const key of Object.keys(extraHTTPHeaders)) {
const value = extraHTTPHeaders[key];
assert(
helper.isString(value),
`Expected value of header "${key}" to be String, but "${typeof value}" is found.`
);
this._extraHTTPHeaders[key.toLowerCase()] = value;
}
await this._client.send('Network.setExtraHTTPHeaders', {
headers: this._extraHTTPHeaders,
});
}
extraHTTPHeaders(): Record<string, string> {
return Object.assign({}, this._extraHTTPHeaders);
}
numRequestsInProgress(): number {
return [...this._requestIdToRequest].filter(([, request]) => {
return !request.response();
}).length;
}
async setOfflineMode(value: boolean): Promise<void> {
this._emulatedNetworkConditions.offline = value;
await this._updateNetworkConditions();
}
async emulateNetworkConditions(
networkConditions: NetworkConditions | null
): Promise<void> {
this._emulatedNetworkConditions.upload = networkConditions
? networkConditions.upload
: -1;
this._emulatedNetworkConditions.download = networkConditions
? networkConditions.download
: -1;
this._emulatedNetworkConditions.latency = networkConditions
? networkConditions.latency
: 0;
await this._updateNetworkConditions();
}
async _updateNetworkConditions(): Promise<void> {
await this._client.send('Network.emulateNetworkConditions', {
offline: this._emulatedNetworkConditions.offline,
latency: this._emulatedNetworkConditions.latency,
uploadThroughput: this._emulatedNetworkConditions.upload,
downloadThroughput: this._emulatedNetworkConditions.download,
});
}
async setUserAgent(
userAgent: string,
userAgentMetadata?: Protocol.Emulation.UserAgentMetadata
): Promise<void> {
await this._client.send('Network.setUserAgentOverride', {
userAgent: userAgent,
userAgentMetadata: userAgentMetadata,
});
}
async setCacheEnabled(enabled: boolean): Promise<void> {
this._userCacheDisabled = !enabled;
await this._updateProtocolCacheDisabled();
}
async setRequestInterception(value: boolean): Promise<void> {
this._userRequestInterceptionEnabled = value;
await this._updateProtocolRequestInterception();
}
async _updateProtocolRequestInterception(): Promise<void> {
const enabled = this._userRequestInterceptionEnabled || !!this._credentials;
if (enabled === this._protocolRequestInterceptionEnabled) return;
this._protocolRequestInterceptionEnabled = enabled;
if (enabled) {
await Promise.all([
this._updateProtocolCacheDisabled(),
this._client.send('Fetch.enable', {
handleAuthRequests: true,
patterns: [{ urlPattern: '*' }],
}),
]);
} else {
await Promise.all([
this._updateProtocolCacheDisabled(),
this._client.send('Fetch.disable'),
]);
}
}
_cacheDisabled(): boolean {
return this._userCacheDisabled;
}
async _updateProtocolCacheDisabled(): Promise<void> {
await this._client.send('Network.setCacheDisabled', {
cacheDisabled: this._cacheDisabled(),
});
}
_onRequestWillBeSent(event: Protocol.Network.RequestWillBeSentEvent): void {
// Request interception doesn't happen for data URLs with Network Service.
if (
this._userRequestInterceptionEnabled &&
!event.request.url.startsWith('data:')
) {
const requestId = event.requestId;
const requestPausedEvent =
this._requestIdToRequestPausedEvent.get(requestId);
this._requestIdToRequestWillBeSentEvent.set(requestId, event);
if (requestPausedEvent) {
const interceptionId = requestPausedEvent.requestId;
this._onRequest(event, interceptionId);
this._requestIdToRequestPausedEvent.delete(requestId);
}
return;
}
this._onRequest(event, null);
}
_onAuthRequired(event: Protocol.Fetch.AuthRequiredEvent): void {
/* TODO(jacktfranklin): This is defined in protocol.d.ts but not
* in an easily referrable way - we should look at exposing it.
*/
type AuthResponse = 'Default' | 'CancelAuth' | 'ProvideCredentials';
let response: AuthResponse = 'Default';
if (this._attemptedAuthentications.has(event.requestId)) {
response = 'CancelAuth';
} else if (this._credentials) {
response = 'ProvideCredentials';
this._attemptedAuthentications.add(event.requestId);
}
const { username, password } = this._credentials || {
username: undefined,
password: undefined,
};
this._client
.send('Fetch.continueWithAuth', {
requestId: event.requestId,
authChallengeResponse: { response, username, password },
})
.catch(debugError);
}
_onRequestPaused(event: Protocol.Fetch.RequestPausedEvent): void {
if (
!this._userRequestInterceptionEnabled &&
this._protocolRequestInterceptionEnabled
) {
this._client
.send('Fetch.continueRequest', {
requestId: event.requestId,
})
.catch(debugError);
}
const requestId = event.networkId;
const interceptionId = event.requestId;
if (!requestId) {
return;
}
let requestWillBeSentEvent =
this._requestIdToRequestWillBeSentEvent.get(requestId);
// redirect requests have the same `requestId`,
if (
requestWillBeSentEvent &&
(requestWillBeSentEvent.request.url !== event.request.url ||
requestWillBeSentEvent.request.method !== event.request.method)
) {
this._requestIdToRequestWillBeSentEvent.delete(requestId);
requestWillBeSentEvent = null;
}
if (requestWillBeSentEvent) {
this._onRequest(requestWillBeSentEvent, interceptionId);
} else {
this._requestIdToRequestPausedEvent.set(requestId, event);
}
}
_requestIdToQueuedRedirectInfo(requestId: string): Array<{
event: Protocol.Network.RequestWillBeSentEvent;
interceptionId?: string;
}> {
if (!this._requestIdToQueuedRedirectInfoMap.has(requestId)) {
this._requestIdToQueuedRedirectInfoMap.set(requestId, []);
}
return this._requestIdToQueuedRedirectInfoMap.get(requestId);
}
_requestIdToResponseExtraInfo(
requestId: string
): Protocol.Network.ResponseReceivedExtraInfoEvent[] {
if (!this._requestIdToResponseReceivedExtraInfo.has(requestId)) {
this._requestIdToResponseReceivedExtraInfo.set(requestId, []);
}
return this._requestIdToResponseReceivedExtraInfo.get(requestId);
}
_onRequest(
event: Protocol.Network.RequestWillBeSentEvent,
interceptionId?: string
): void {
let redirectChain = [];
if (event.redirectResponse) {
// We want to emit a response and requestfinished for the
// redirectResponse, but we can't do so unless we have a
// responseExtraInfo ready to pair it up with. If we don't have any
// responseExtraInfos saved in our queue, they we have to wait until
// the next one to emit response and requestfinished, *and* we should
// also wait to emit this Request too because it should come after the
// response/requestfinished.
let redirectResponseExtraInfo = null;
if (event.redirectHasExtraInfo) {
redirectResponseExtraInfo = this._requestIdToResponseExtraInfo(
event.requestId
).shift();
if (!redirectResponseExtraInfo) {
this._requestIdToQueuedRedirectInfo(event.requestId).push({
event,
interceptionId,
});
return;
}
}
const request = this._requestIdToRequest.get(event.requestId);
// If we connect late to the target, we could have missed the
// requestWillBeSent event.
if (request) {
this._handleRequestRedirect(
request,
event.redirectResponse,
redirectResponseExtraInfo
);
redirectChain = request._redirectChain;
}
}
const frame = event.frameId
? this._frameManager.frame(event.frameId)
: null;
const request = new HTTPRequest(
this._client,
frame,
interceptionId,
this._userRequestInterceptionEnabled,
event,
redirectChain
);
this._requestIdToRequest.set(event.requestId, request);
this.emit(NetworkManagerEmittedEvents.Request, request);
request.finalizeInterceptions();
}
_onRequestServedFromCache(
event: Protocol.Network.RequestServedFromCacheEvent
): void {
const request = this._requestIdToRequest.get(event.requestId);
if (request) request._fromMemoryCache = true;
this.emit(NetworkManagerEmittedEvents.RequestServedFromCache, request);
}
_handleRequestRedirect(
request: HTTPRequest,
responsePayload: Protocol.Network.Response,
extraInfo: Protocol.Network.ResponseReceivedExtraInfoEvent
): void {
const response = new HTTPResponse(
this._client,
request,
responsePayload,
extraInfo
);
request._response = response;
request._redirectChain.push(request);
response._resolveBody(
new Error('Response body is unavailable for redirect responses')
);
this._forgetRequest(request, false);
this.emit(NetworkManagerEmittedEvents.Response, response);
this.emit(NetworkManagerEmittedEvents.RequestFinished, request);
}
_emitResponseEvent(
responseReceived: Protocol.Network.ResponseReceivedEvent,
extraInfo: Protocol.Network.ResponseReceivedExtraInfoEvent
): void {
const request = this._requestIdToRequest.get(responseReceived.requestId);
// FileUpload sends a response without a matching request.
if (!request) return;
const extraInfos = this._requestIdToResponseExtraInfo(
responseReceived.requestId
);
if (extraInfos.length) {
throw new Error(
'Unexpected extraInfo events for request ' + responseReceived.requestId
);
}
const response = new HTTPResponse(
this._client,
request,
responseReceived.response,
extraInfo
);
request._response = response;
this.emit(NetworkManagerEmittedEvents.Response, response);
}
_onResponseReceived(event: Protocol.Network.ResponseReceivedEvent): void {
const request = this._requestIdToRequest.get(event.requestId);
let extraInfo = null;
if (request && !request._fromMemoryCache && event.hasExtraInfo) {
extraInfo = this._requestIdToResponseExtraInfo(event.requestId).shift();
if (!extraInfo) {
// Wait until we get the corresponding ExtraInfo event.
let resolver = null;
const promise = new Promise<void>((resolve) => (resolver = resolve));
this._requestIdToQueuedEvents.set(event.requestId, {
responseReceived: event,
promise,
resolver,
});
return;
}
}
this._emitResponseEvent(event, extraInfo);
}
responseWaitingForExtraInfoPromise(requestId: string): Promise<void> {
const responseReceived = this._requestIdToQueuedEvents.get(requestId);
if (!responseReceived) return Promise.resolve();
return responseReceived.promise;
}
_onResponseReceivedExtraInfo(
event: Protocol.Network.ResponseReceivedExtraInfoEvent
): void {
// We may have skipped a redirect response/request pair due to waiting for
// this ExtraInfo event. If so, continue that work now that we have the
// request.
const redirectInfo = this._requestIdToQueuedRedirectInfo(
event.requestId
).shift();
if (redirectInfo) {
this._requestIdToResponseExtraInfo(event.requestId).push(event);
this._onRequest(redirectInfo.event, redirectInfo.interceptionId);
return;
}
// We may have skipped response and loading events because we didn't have
// this ExtraInfo event yet. If so, emit those events now.
const queuedEvents = this._requestIdToQueuedEvents.get(event.requestId);
if (queuedEvents) {
this._emitResponseEvent(queuedEvents.responseReceived, event);
if (queuedEvents.loadingFinished) {
this._emitLoadingFinished(queuedEvents.loadingFinished);
}
if (queuedEvents.loadingFailed) {
this._emitLoadingFailed(queuedEvents.loadingFailed);
}
queuedEvents.resolver();
return;
}
// Wait until we get another event that can use this ExtraInfo event.
this._requestIdToResponseExtraInfo(event.requestId).push(event);
}
_forgetRequest(request: HTTPRequest, events: boolean): void {
const requestId = request._requestId;
const interceptionId = request._interceptionId;
this._requestIdToRequest.delete(requestId);
this._attemptedAuthentications.delete(interceptionId);
if (events) {
this._requestIdToRequestWillBeSentEvent.delete(requestId);
this._requestIdToRequestPausedEvent.delete(requestId);
this._requestIdToQueuedEvents.delete(requestId);
this._requestIdToQueuedRedirectInfoMap.delete(requestId);
this._requestIdToResponseReceivedExtraInfo.delete(requestId);
}
}
_onLoadingFinished(event: Protocol.Network.LoadingFinishedEvent): void {
// If the response event for this request is still waiting on a
// corresponding ExtraInfo event, then wait to emit this event too.
const queuedEvents = this._requestIdToQueuedEvents.get(event.requestId);
if (queuedEvents) {
queuedEvents.loadingFinished = event;
} else {
this._emitLoadingFinished(event);
}
}
_emitLoadingFinished(event: Protocol.Network.LoadingFinishedEvent): void {
const request = this._requestIdToRequest.get(event.requestId);
// For certain requestIds we never receive requestWillBeSent event.
// @see https://crbug.com/750469
if (!request) return;
// Under certain conditions we never get the Network.responseReceived
// event from protocol. @see https://crbug.com/883475
if (request.response()) request.response()._resolveBody(null);
this._forgetRequest(request, true);
this.emit(NetworkManagerEmittedEvents.RequestFinished, request);
}
_onLoadingFailed(event: Protocol.Network.LoadingFailedEvent): void {
// If the response event for this request is still waiting on a
// corresponding ExtraInfo event, then wait to emit this event too.
const queuedEvents = this._requestIdToQueuedEvents.get(event.requestId);
if (queuedEvents) {
queuedEvents.loadingFailed = event;
} else {
this._emitLoadingFailed(event);
}
}
_emitLoadingFailed(event: Protocol.Network.LoadingFailedEvent): void {
const request = this._requestIdToRequest.get(event.requestId);
// For certain requestIds we never receive requestWillBeSent event.
// @see https://crbug.com/750469
if (!request) return;
request._failureText = event.errorText;
const response = request.response();
if (response) response._resolveBody(null);
this._forgetRequest(request, true);
this.emit(NetworkManagerEmittedEvents.RequestFailed, request);
}
}