8908908344

Committed 01 May 2024 11:45AM UTC coverage: 81.27%. Remained the same

Build # 8908908344

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push

github

Committed by

andrzej-woof

Commit Message

fix module resolution

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611 of 668 branches covered (91.47%)

Branch coverage included in aggregate %.

2218 of 2813 relevant lines covered (78.85%)

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66.85

/packages/server/src/mock.ts

import { request as fetchRequest } from 'undici';
import type { Dispatcher } from 'undici';
import http from 'http';
import https from 'https';
import express from 'express';
import { v4 as uuidv4 } from 'uuid';
import { getRuleExecutor } from './ruleExecutor';
import { getTrafficStore } from './storage';
import { RawHeaders, logger, HttpCode, naiveGQLParser, escapeStringRegexp, errorToLog, HTTP_METHODS } from '@stuntman/shared';
import { RequestContext } from './requestContext';
import type * as Stuntman from '@stuntman/shared';
import { IPUtils } from './ipUtils';
import { LRUCache } from 'lru-cache';
import { API } from './api/api';

// TODO add proper web proxy mode

export class Mock {
    public readonly mockUuid: string;
    protected options: Stuntman.Config;
    protected mockApp: express.Express | null = null;
    protected MOCK_DOMAIN_REGEX: RegExp;
    protected URL_PORT_REGEX: RegExp;
    protected server: http.Server | null = null;
    protected serverHttps: https.Server | null = null;
    protected trafficStore: LRUCache<string, Stuntman.LogEntry>;
    protected ipUtils: IPUtils | null = null;
    private _api: API | null = null;

    protected get apiServer() {
        if (this.options.api.disabled) {
            return null;
        }
        if (!this._api) {
            this._api = new API({ ...this.options.api, mockUuid: this.mockUuid }, this.options.webgui);
        }
        return this._api;
    }

    public get ruleExecutor(): Stuntman.RuleExecutorInterface {
        return getRuleExecutor(this.mockUuid);
    }

    constructor(options: Stuntman.Config) {
        this.mockUuid = uuidv4();
        this.options = options;
        if (this.options.mock.httpsPort && (!this.options.mock.httpsKey || !this.options.mock.httpsCert)) {
            throw new Error('missing https key/cert');
        }

        this.MOCK_DOMAIN_REGEX = new RegExp(
            `(?:\\.([0-9]+))?\\.(?:(?:${this.options.mock.domain}(https?)?)|(?:localhost))(:${this.options.mock.port}${
                this.options.mock.httpsPort ? `|${this.options.mock.httpsPort}` : ''
            })?(?:\\b|$)`,
            'i'
        );
        this.URL_PORT_REGEX = new RegExp(
            `^(https?:\\/\\/[^:/]+):(?:${this.options.mock.port}${
                this.options.mock.httpsPort ? `|${this.options.mock.httpsPort}` : ''
            })(\\/.*)`,
            'i'
        );
        this.trafficStore = getTrafficStore(this.mockUuid, this.options.storage.traffic);
        this.ipUtils =
            !this.options.mock.externalDns || this.options.mock.externalDns.length === 0
                ? null
                : new IPUtils({ mockUuid: this.mockUuid, externalDns: this.options.mock.externalDns });

        this.requestHandler = this.requestHandler.bind(this);
        this.bindRequestContext = this.bindRequestContext.bind(this);
        this.errorHandler = this.errorHandler.bind(this);
    }

    private extractJwt(req: Stuntman.Request): any {
        try {
            const authorizationHeaderIndex = req.rawHeaders.findIndex((header) => header.toLowerCase() === 'authorization');
            if (authorizationHeaderIndex < 0) {
                return { result: false, description: 'missing authorization header' };
            }
            const authorizationHeaderValue = req.rawHeaders[authorizationHeaderIndex + 1];
            const token =
                authorizationHeaderValue &&
                (authorizationHeaderValue.startsWith('Bearer ')
                    ? authorizationHeaderValue.split(' ')[1]
                    : authorizationHeaderValue);
            if (!token) {
                return undefined;
            }
            const base64Url = token.split('.')[1];
            if (!base64Url) {
                return undefined;
            }
            const base64 = base64Url.replace(/-/g, '+').replace(/_/g, '/');
            const jsonPayload = decodeURIComponent(
                Buffer.from(base64, 'base64')
                    .toString('ascii')
                    .split('')
                    .map(function (c) {
                        return `%${`00${c.charCodeAt(0).toString(16)}`.slice(-2)}`;
                    })
                    .join('')
            );
            return JSON.parse(jsonPayload);
        } catch (error) {
            // TODO
        }
        return undefined;
    }

    private async requestHandler(req: express.Request, res: express.Response): Promise<void> {
        const ctx: RequestContext | null = RequestContext.get(req);
        const requestUuid = ctx?.uuid || uuidv4();
        const timestamp = Date.now();
        const originalHostname = req.headers.host || req.hostname;
        const unproxiedHostname = req.hostname.replace(this.MOCK_DOMAIN_REGEX, '');
        const isProxiedHostname = originalHostname !== unproxiedHostname;
        const originalRequest: Stuntman.Request = {
            id: requestUuid,
            timestamp,
            url: `${req.protocol}://${req.hostname}${req.originalUrl}`,
            method: req.method.toUpperCase() as Stuntman.HttpMethod,
            rawHeaders: new RawHeaders(...req.rawHeaders),
            ...((Buffer.isBuffer(req.body) && { body: req.body.toString('utf-8') }) ||
                (typeof req.body === 'string' && { body: req.body })),
        };
        logger.debug(originalRequest, 'processing request');
        const logContext: Record<string, any> = {
            requestId: originalRequest.id,
        };
        const mockEntry: Stuntman.WithRequiredProperty<Stuntman.LogEntry, 'modifiedRequest'> = {
            originalRequest,
            modifiedRequest: {
                ...this.unproxyRequest(req),
                id: requestUuid,
                timestamp,
                ...(originalRequest.body && { gqlBody: naiveGQLParser(originalRequest.body) }),
                jwt: this.extractJwt(originalRequest),
            },
        };
        if (!isProxiedHostname) {
            this.removeProxyPort(mockEntry.modifiedRequest);
        }
        const matchingRule = await this.ruleExecutor.findMatchingRule(mockEntry.modifiedRequest);
        if (matchingRule) {
            mockEntry.mockRuleId = matchingRule.id;
            mockEntry.labels = matchingRule.labels;
            if (matchingRule.actions.mockResponse) {
                const staticResponse =
                    typeof matchingRule.actions.mockResponse === 'function'
                        ? matchingRule.actions.mockResponse(mockEntry.modifiedRequest)
                        : matchingRule.actions.mockResponse;
                mockEntry.modifiedResponse = staticResponse;
                logger.debug({ ...logContext, staticResponse }, 'replying with mocked response');
                if (matchingRule.storeTraffic) {
                    this.trafficStore.set(requestUuid, mockEntry);
                }
                if (staticResponse.rawHeaders) {
                    for (const header of staticResponse.rawHeaders.toHeaderPairs()) {
                        res.setHeader(header[0], header[1]);
                    }
                }
                res.status(staticResponse.status || 200);
                res.send(staticResponse.body);
                // static response blocks any further processing
                return;
            }
            if (matchingRule.actions.modifyRequest) {
                mockEntry.modifiedRequest = matchingRule.actions.modifyRequest(mockEntry.modifiedRequest);
                logger.debug({ ...logContext, modifiedRequest: mockEntry.modifiedRequest }, 'modified original request');
            }
        }
        if (this.ipUtils && !isProxiedHostname && !this.ipUtils.isIP(originalHostname)) {
            const hostname = originalHostname.split(':')[0]!;
            try {
                const internalIPs = await this.ipUtils.resolveIP(hostname);
                if (this.ipUtils.isLocalhostIP(internalIPs) && this.options.mock.externalDns.length) {
                    const externalIPs = await this.ipUtils.resolveIP(hostname, { useExternalDns: true });
                    logger.debug({ ...logContext, hostname, externalIPs, internalIPs }, 'switched to external IP');
                    mockEntry.modifiedRequest.url = mockEntry.modifiedRequest.url.replace(
                        /^(https?:\/\/)[^:/]+/i,
                        `$1${externalIPs}`
                    );
                }
            } catch (error) {
                // swallow the exeception, don't think much can be done at this point
                logger.warn({ ...logContext, error: errorToLog(error as Error) }, `error trying to resolve IP for "${hostname}"`);
            }
        }

        const originalResponse: Required<Stuntman.Response> = this.options.mock.disableProxy
            ? {
                  timestamp: Date.now(),
                  body: undefined,
                  rawHeaders: new RawHeaders(),
                  status: 404,
              }
            : await this.proxyRequest(req, mockEntry, logContext);

        logger.debug({ ...logContext, originalResponse }, 'received response');
        mockEntry.originalResponse = originalResponse;
        let modifedResponse: Stuntman.Response = {
            ...originalResponse,
            rawHeaders: new RawHeaders(
                ...Array.from(originalResponse.rawHeaders.toHeaderPairs()).flatMap(([key, value]) => {
                    // TODO this replace may be too aggressive and doesn't handle protocol (won't be necessary with a trusted cert and mock serving http+https)
                    return [
                        key,
                        isProxiedHostname
                            ? value
                            : value.replace(
                                  new RegExp(`(?:^|\\b)(${escapeStringRegexp(unproxiedHostname)})(?:\\b|$)`, 'igm'),
                                  originalHostname
                              ),
                    ];
                })
            ),
        };
        if (matchingRule?.actions.modifyResponse) {
            modifedResponse = matchingRule?.actions.modifyResponse(mockEntry.modifiedRequest, originalResponse);
            logger.debug({ ...logContext, modifedResponse }, 'modified response');
        }

        mockEntry.modifiedResponse = modifedResponse;
        if (matchingRule?.storeTraffic) {
            this.trafficStore.set(requestUuid, mockEntry);
        }

        if (modifedResponse.status) {
            res.status(modifedResponse.status);
        }
        if (modifedResponse.rawHeaders) {
            for (const header of modifedResponse.rawHeaders.toHeaderPairs()) {
                // since fetch decompresses responses we need to get rid of some headers
                // TODO maybe could be handled better than just skipping, although express should add these back for new body
                // if (/^content-(?:length|encoding)$/i.test(header[0])) {
                //     continue;
                // }
                res.setHeader(header[0], isProxiedHostname ? header[1].replace(unproxiedHostname, originalHostname) : header[1]);
            }
        }
        res.end(Buffer.from(modifedResponse.body, 'binary'));
    }

    private bindRequestContext(req: express.Request, _res: express.Response, next: express.NextFunction) {
        RequestContext.bind(req, this.mockUuid);
        next();
    }

    private errorHandler(error: Error, req: express.Request, res: express.Response) {
        const ctx: RequestContext | null = RequestContext.get(req);
        const uuid = ctx?.uuid || uuidv4();
        logger.error({ error: errorToLog(error), uuid }, 'unexpected error');
        if (res) {
            res.status(HttpCode.INTERNAL_SERVER_ERROR).json({
                error: { message: error.message, httpCode: HttpCode.INTERNAL_SERVER_ERROR, uuid },
            });
            return;
        }
        // eslint-disable-next-line no-console
        console.error('mock server encountered a critical error. exiting');
        process.exit(1);
    }

    private init() {
        if (this.mockApp) {
            return;
        }
        this.mockApp = express();
        // TODO for now request body is just a buffer passed further, not inflated
        this.mockApp.use(express.raw({ type: '*/*' }));

        this.mockApp.use(this.bindRequestContext);

        this.mockApp.all(/.*/, this.requestHandler);

        this.mockApp.use(this.errorHandler);
    }

    private async proxyRequest(
        req: express.Request,
        mockEntry: Stuntman.WithRequiredProperty<Stuntman.LogEntry, 'modifiedRequest'>,
        logContext: any
    ) {
        let controller: AbortController | null = new AbortController();
        const fetchTimeout = setTimeout(() => {
            if (controller) {
                controller.abort(`timeout after ${this.options.mock.timeout}`);
            }
        }, this.options.mock.timeout);
        req.on('close', () => {
            logger.debug(logContext, 'remote client canceled the request');
            clearTimeout(fetchTimeout);
            if (controller) {
                controller.abort('remote client canceled the request');
            }
        });
        let targetResponse: Dispatcher.ResponseData;
        try {
            const requestOptions = {
                headers: mockEntry.modifiedRequest.rawHeaders,
                body: mockEntry.modifiedRequest.body,
                method: mockEntry.modifiedRequest.method,
            };
            logger.debug(
                {
                    ...logContext,
                    url: mockEntry.modifiedRequest.url,
                    ...requestOptions,
                },
                'outgoing request attempt'
            );
            // TODO migrate to node-libcurl
            targetResponse = await fetchRequest(mockEntry.modifiedRequest.url, requestOptions);
        } catch (error) {
            logger.error(
                { ...logContext, error: errorToLog(error as Error), request: mockEntry.modifiedRequest },
                'error fetching'
            );
            throw error;
        } finally {
            controller = null;
            clearTimeout(fetchTimeout);
        }
        const targetResponseBuffer = Buffer.from(await targetResponse.body.arrayBuffer());
        return {
            timestamp: Date.now(),
            body: targetResponseBuffer.toString('binary'),
            status: targetResponse.statusCode,
            rawHeaders: RawHeaders.fromHeadersRecord(targetResponse.headers),
        };
    }

    public start() {
        this.init();
        if (!this.mockApp) {
            throw new Error('initialization error');
        }
        if (this.server) {
            throw new Error('mock server already started');
        }
        if (this.options.mock.httpsPort) {
            this.serverHttps = https
                .createServer(
                    {
                        key: this.options.mock.httpsKey,
                        cert: this.options.mock.httpsCert,
                    },
                    this.mockApp
                )
                .listen(this.options.mock.httpsPort, () => {
                    logger.info(`Mock listening on ${this.options.mock.domain}:${this.options.mock.httpsPort}`);
                });
        }
        this.server = this.mockApp.listen(this.options.mock.port, () => {
            logger.info(`Mock listening on ${this.options.mock.domain}:${this.options.mock.port}`);
            if (!this.options.api.disabled) {
                this.apiServer?.start();
            }
        });
    }

    public async stop(): Promise<void> {
        const closePromises: Promise<void>[] = [];
        if (!this.server) {
            throw new Error('mock server not started');
        }
        if (!this.options.api.disabled) {
            if (!this.apiServer) {
                logger.warn('no api server');
            } else {
                closePromises.push(
                    new Promise<void>((resolve) => {
                        if (!this.apiServer) {
                            resolve();
                            return;
                        }
                        this.apiServer
                            .stop()
                            .then(() => resolve())
                            .catch((error) => {
                                logger.error(error, 'problem closing api server');
                                resolve();
                            });
                    })
                );
            }
        }
        closePromises.push(
            new Promise<void>((resolve) => {
                if (!this.server) {
                    resolve();
                    return;
                }
                this.server.close((error) => {
                    if (error) {
                        logger.warn(error, 'problem closing http server');
                    }
                    this.server = null;
                    resolve();
                });
            })
        );
        if (this.serverHttps) {
            closePromises.push(
                new Promise<void>((resolve) => {
                    if (!this.serverHttps) {
                        resolve();
                        return;
                    }
                    this.serverHttps.close((error) => {
                        if (error) {
                            logger.warn(error, 'problem closing https server');
                        }
                        this.server = null;
                        resolve();
                    });
                })
            );
        }
        await Promise.all(closePromises);
    }

    protected unproxyRequest(req: express.Request): Stuntman.BaseRequest {
        const protocol = (this.MOCK_DOMAIN_REGEX.exec(req.hostname) || [])[2] || req.protocol;
        const port = (this.MOCK_DOMAIN_REGEX.exec(req.hostname) || [])[1] || undefined;

        if (!HTTP_METHODS.includes(req.method.toUpperCase() as Stuntman.HttpMethod)) {
            throw new Error(`unrecognized http method "${req.method}"`);
        }

        // TODO unproxied req might fail if there's a signed url :shrug:
        // but then we can probably switch DNS for some particular 3rd party server to point to mock
        // and in mock have a mapping rule for that domain to point directly to some IP :thinking:
        return {
            url: `${protocol}://${req.hostname.replace(this.MOCK_DOMAIN_REGEX, '')}${port ? `:${port}` : ''}${req.originalUrl}`,
            rawHeaders: new RawHeaders(
                ...req.rawHeaders.map((h) => {
                    let outputHeader = h;
                    if (this.MOCK_DOMAIN_REGEX.test(outputHeader)) {
                        outputHeader = outputHeader.replace(this.MOCK_DOMAIN_REGEX, '').replace(/^https?/i, protocol);
                    }
                    return outputHeader;
                })
            ),
            method: req.method.toUpperCase() as Stuntman.HttpMethod,
            ...(Buffer.isBuffer(req.body) && { body: req.body.toString('utf-8') }),
        };
    }

    protected removeProxyPort(req: Stuntman.Request): void {
        if (this.URL_PORT_REGEX.test(req.url)) {
            req.url = req.url.replace(this.URL_PORT_REGEX, '$1$2');
        }
        const host = req.rawHeaders.get('host') || '';
        if (
            host.endsWith(`:${this.options.mock.port}`) ||
            (this.options.mock.httpsPort && host.endsWith(`:${this.options.mock.httpsPort}`))
        ) {
            req.rawHeaders.set('host', host.split(':')[0]!);
        }
    }
}

1	import { request as fetchRequest } from 'undici';	1✔
2	import type { Dispatcher } from 'undici';	1✔
3	import http from 'http';	1✔
4	import https from 'https';	1✔
5	import express from 'express';	1✔
6	import { v4 as uuidv4 } from 'uuid';	1✔
7	import { getRuleExecutor } from './ruleExecutor';	1✔
8	import { getTrafficStore } from './storage';	1✔
9	import { RawHeaders, logger, HttpCode, naiveGQLParser, escapeStringRegexp, errorToLog, HTTP_METHODS } from '@stuntman/shared';	1✔
10	import { RequestContext } from './requestContext';	1✔
11	import type * as Stuntman from '@stuntman/shared';	1✔
12	import { IPUtils } from './ipUtils';	1✔
13	import { LRUCache } from 'lru-cache';	1✔
14	import { API } from './api/api';	1✔
15		1✔
16	// TODO add proper web proxy mode	1✔
17		1✔
18	export class Mock {	1✔
19	public readonly mockUuid: string;	18✔
20	protected options: Stuntman.Config;	18✔
21	protected mockApp: express.Express \| null = null;	18✔
22	protected MOCK_DOMAIN_REGEX: RegExp;	18✔
23	protected URL_PORT_REGEX: RegExp;	18✔
24	protected server: http.Server \| null = null;	18✔
25	protected serverHttps: https.Server \| null = null;	18✔
26	protected trafficStore: LRUCache<string, Stuntman.LogEntry>;	18✔
27	protected ipUtils: IPUtils \| null = null;	18✔
28	private _api: API \| null = null;	18✔
29		18✔
30	protected get apiServer() {	18✔
31	if (this.options.api.disabled) {	7✔
32	return null;	1✔
33	}	1✔
34	if (!this._api) {	7✔
35	this._api = new API({ ...this.options.api, mockUuid: this.mockUuid }, this.options.webgui);	2✔
36	}	2✔
37	return this._api;	6✔
38	}	6✔
39		18✔
40	public get ruleExecutor(): Stuntman.RuleExecutorInterface {	18✔
41	return getRuleExecutor(this.mockUuid);	2✔
42	}	2✔
43		18✔
44	constructor(options: Stuntman.Config) {	18✔
45	this.mockUuid = uuidv4();	18✔
46	this.options = options;	18✔
47	if (this.options.mock.httpsPort && (!this.options.mock.httpsKey \|\| !this.options.mock.httpsCert)) {	18✔
48	throw new Error('missing https key/cert');	2✔
49	}	2✔
50		16✔
51	this.MOCK_DOMAIN_REGEX = new RegExp(	16✔
52	`(?:\\.([0-9]+))?\\.(?:(?:${this.options.mock.domain}(https?)?)\|(?:localhost))(:${this.options.mock.port}${	16✔
53	this.options.mock.httpsPort ? `\|${this.options.mock.httpsPort}` : ''	18✔
54	})?(?:\\b\|$)`,	18✔
55	'i'	18✔
56	);	18✔
57	this.URL_PORT_REGEX = new RegExp(	18✔
58	`^(https?:\\/\\/[^:/]+):(?:${this.options.mock.port}${	18✔
59	this.options.mock.httpsPort ? `\|${this.options.mock.httpsPort}` : ''	18✔
60	})(\\/.*)`,	18✔
61	'i'	18✔
62	);	18✔
63	this.trafficStore = getTrafficStore(this.mockUuid, this.options.storage.traffic);	18✔
64	this.ipUtils =	18✔
65	!this.options.mock.externalDns \|\| this.options.mock.externalDns.length === 0	18✔
66	? null	18✔
67	: new IPUtils({ mockUuid: this.mockUuid, externalDns: this.options.mock.externalDns });	18✔
68		18✔
69	this.requestHandler = this.requestHandler.bind(this);	18✔
70	this.bindRequestContext = this.bindRequestContext.bind(this);	18✔
71	this.errorHandler = this.errorHandler.bind(this);	18✔
72	}	18✔
73		18✔
74	private extractJwt(req: Stuntman.Request): any {	18✔
75	try {	2✔
76	const authorizationHeaderIndex = req.rawHeaders.findIndex((header) => header.toLowerCase() === 'authorization');	2✔
77	if (authorizationHeaderIndex < 0) {	2✔
78	return { result: false, description: 'missing authorization header' };	2✔
79	}	2✔
80	const authorizationHeaderValue = req.rawHeaders[authorizationHeaderIndex + 1];	×
81	const token =	×
82	authorizationHeaderValue &&	×
83	(authorizationHeaderValue.startsWith('Bearer ')	×
84	? authorizationHeaderValue.split(' ')[1]	×
85	: authorizationHeaderValue);	2✔
86	if (!token) {	2!
87	return undefined;	×
88	}	×
89	const base64Url = token.split('.')[1];	×
90	if (!base64Url) {	×
91	return undefined;	×
92	}	×
93	const base64 = base64Url.replace(/-/g, '+').replace(/_/g, '/');	×
94	const jsonPayload = decodeURIComponent(	×
95	Buffer.from(base64, 'base64')	×
96	.toString('ascii')	×
97	.split('')	×
98	.map(function (c) {	×
99	return `%${`00${c.charCodeAt(0).toString(16)}`.slice(-2)}`;	×
100	})	×
101	.join('')	×
102	);	×
103	return JSON.parse(jsonPayload);	×
104	} catch (error) {	×
105	// TODO	×
106	}	×
107	return undefined;	×
108	}	×
109		18✔
110	private async requestHandler(req: express.Request, res: express.Response): Promise<void> {	18✔
111	const ctx: RequestContext \| null = RequestContext.get(req);	2✔
112	const requestUuid = ctx?.uuid \|\| uuidv4();	2!
113	const timestamp = Date.now();	2✔
114	const originalHostname = req.headers.host \|\| req.hostname;	2✔
115	const unproxiedHostname = req.hostname.replace(this.MOCK_DOMAIN_REGEX, '');	2✔
116	const isProxiedHostname = originalHostname !== unproxiedHostname;	2✔
117	const originalRequest: Stuntman.Request = {	2✔
118	id: requestUuid,	2✔
119	timestamp,	2✔
120	url: `${req.protocol}://${req.hostname}${req.originalUrl}`,	2✔
121	method: req.method.toUpperCase() as Stuntman.HttpMethod,	2✔
122	rawHeaders: new RawHeaders(...req.rawHeaders),	2✔
123	...((Buffer.isBuffer(req.body) && { body: req.body.toString('utf-8') }) \|\|	2!
124	(typeof req.body === 'string' && { body: req.body })),	2!
125	};	2✔
126	logger.debug(originalRequest, 'processing request');	2✔
127	const logContext: Record<string, any> = {	2✔
128	requestId: originalRequest.id,	2✔
129	};	2✔
130	const mockEntry: Stuntman.WithRequiredProperty<Stuntman.LogEntry, 'modifiedRequest'> = {	2✔
131	originalRequest,	2✔
132	modifiedRequest: {	2✔
133	...this.unproxyRequest(req),	2✔
134	id: requestUuid,	2✔
135	timestamp,	2✔
136	...(originalRequest.body && { gqlBody: naiveGQLParser(originalRequest.body) }),	2!
137	jwt: this.extractJwt(originalRequest),	2✔
138	},	2✔
139	};	2✔
140	if (!isProxiedHostname) {	2✔
141	this.removeProxyPort(mockEntry.modifiedRequest);	2✔
142	}	2✔
143	const matchingRule = await this.ruleExecutor.findMatchingRule(mockEntry.modifiedRequest);	2✔
144	if (matchingRule) {	2✔
145	mockEntry.mockRuleId = matchingRule.id;	2✔
146	mockEntry.labels = matchingRule.labels;	2✔
147	if (matchingRule.actions.mockResponse) {	2✔
148	const staticResponse =	1✔
149	typeof matchingRule.actions.mockResponse === 'function'	1✔
150	? matchingRule.actions.mockResponse(mockEntry.modifiedRequest)	1✔
151	: matchingRule.actions.mockResponse;	1!
152	mockEntry.modifiedResponse = staticResponse;	1✔
153	logger.debug({ ...logContext, staticResponse }, 'replying with mocked response');	1✔
154	if (matchingRule.storeTraffic) {	1!
155	this.trafficStore.set(requestUuid, mockEntry);	×
156	}	×
157	if (staticResponse.rawHeaders) {	1!
158	for (const header of staticResponse.rawHeaders.toHeaderPairs()) {	×
159	res.setHeader(header[0], header[1]);	×
160	}	×
161	}	×
162	res.status(staticResponse.status \|\| 200);	1!
163	res.send(staticResponse.body);	1✔
164	// static response blocks any further processing	1✔
165	return;	1✔
166	}	1✔
167	if (matchingRule.actions.modifyRequest) {	2!
168	mockEntry.modifiedRequest = matchingRule.actions.modifyRequest(mockEntry.modifiedRequest);	×
169	logger.debug({ ...logContext, modifiedRequest: mockEntry.modifiedRequest }, 'modified original request');	×
170	}	×
171	}	2✔
172	if (this.ipUtils && !isProxiedHostname && !this.ipUtils.isIP(originalHostname)) {	2✔
173	const hostname = originalHostname.split(':')[0]!;	1✔
174	try {	1✔
175	const internalIPs = await this.ipUtils.resolveIP(hostname);	1✔
176	if (this.ipUtils.isLocalhostIP(internalIPs) && this.options.mock.externalDns.length) {	1!
177	const externalIPs = await this.ipUtils.resolveIP(hostname, { useExternalDns: true });	×
178	logger.debug({ ...logContext, hostname, externalIPs, internalIPs }, 'switched to external IP');	×
179	mockEntry.modifiedRequest.url = mockEntry.modifiedRequest.url.replace(	×
180	/^(https?:\/\/)[^:/]+/i,	×
181	`$1${externalIPs}`	×
182	);	×
183	}	×
184	} catch (error) {	1!
185	// swallow the exeception, don't think much can be done at this point	×
186	logger.warn({ ...logContext, error: errorToLog(error as Error) }, `error trying to resolve IP for "${hostname}"`);	×
187	}	×
188	}	1✔
189		×
190	const originalResponse: Required<Stuntman.Response> = this.options.mock.disableProxy	×
191	? {	×
192	timestamp: Date.now(),	×
193	body: undefined,	×
194	rawHeaders: new RawHeaders(),	×
195	status: 404,	×
196	}	×
197	: await this.proxyRequest(req, mockEntry, logContext);	2!
198		×
199	logger.debug({ ...logContext, originalResponse }, 'received response');	×
200	mockEntry.originalResponse = originalResponse;	×
201	let modifedResponse: Stuntman.Response = {	×
202	...originalResponse,	×
203	rawHeaders: new RawHeaders(	×
204	...Array.from(originalResponse.rawHeaders.toHeaderPairs()).flatMap(([key, value]) => {	×
205	// TODO this replace may be too aggressive and doesn't handle protocol (won't be necessary with a trusted cert and mock serving http+https)	×
206	return [	×
207	key,	×
208	isProxiedHostname	×
209	? value	×
210	: value.replace(	×
211	new RegExp(`(?:^\|\\b)(${escapeStringRegexp(unproxiedHostname)})(?:\\b\|$)`, 'igm'),	×
212	originalHostname	×
213	),	×
214	];	×
215	})	×
216	),	×
217	};	×
218	if (matchingRule?.actions.modifyResponse) {	2!
219	modifedResponse = matchingRule?.actions.modifyResponse(mockEntry.modifiedRequest, originalResponse);	×
220	logger.debug({ ...logContext, modifedResponse }, 'modified response');	×
221	}	×
222		×
223	mockEntry.modifiedResponse = modifedResponse;	×
224	if (matchingRule?.storeTraffic) {	2!
225	this.trafficStore.set(requestUuid, mockEntry);	×
226	}	×
227		×
228	if (modifedResponse.status) {	×
229	res.status(modifedResponse.status);	×
230	}	×
231	if (modifedResponse.rawHeaders) {	×
232	for (const header of modifedResponse.rawHeaders.toHeaderPairs()) {	×
233	// since fetch decompresses responses we need to get rid of some headers	×
234	// TODO maybe could be handled better than just skipping, although express should add these back for new body	×
235	// if (/^content-(?:length\|encoding)$/i.test(header[0])) {	×
236	// continue;	×
237	// }	×
238	res.setHeader(header[0], isProxiedHostname ? header[1].replace(unproxiedHostname, originalHostname) : header[1]);	×
239	}	×
240	}	×
241	res.end(Buffer.from(modifedResponse.body, 'binary'));	×
242	}	×
243		18✔
244	private bindRequestContext(req: express.Request, _res: express.Response, next: express.NextFunction) {	18✔
245	RequestContext.bind(req, this.mockUuid);	1✔
246	next();	1✔
247	}	1✔
248		18✔
249	private errorHandler(error: Error, req: express.Request, res: express.Response) {	18✔
250	const ctx: RequestContext \| null = RequestContext.get(req);	1✔
251	const uuid = ctx?.uuid \|\| uuidv4();	1!
252	logger.error({ error: errorToLog(error), uuid }, 'unexpected error');	1✔
253	if (res) {	1✔
254	res.status(HttpCode.INTERNAL_SERVER_ERROR).json({	1✔
255	error: { message: error.message, httpCode: HttpCode.INTERNAL_SERVER_ERROR, uuid },	1✔
256	});	1✔
257	return;	1✔
258	}	1✔
259	// eslint-disable-next-line no-console	×
260	console.error('mock server encountered a critical error. exiting');	×
261	process.exit(1);	×
262	}	×
263		18✔
264	private init() {	18✔
265	if (this.mockApp) {	2!
266	return;	×
267	}	×
268	this.mockApp = express();	2✔
269	// TODO for now request body is just a buffer passed further, not inflated	2✔
270	this.mockApp.use(express.raw({ type: '/' }));	2✔
271		2✔
272	this.mockApp.use(this.bindRequestContext);	2✔
273		2✔
274	this.mockApp.all(/.*/, this.requestHandler);	2✔
275		2✔
276	this.mockApp.use(this.errorHandler);	2✔
277	}	2✔
278		18✔
279	private async proxyRequest(	18✔
280	req: express.Request,	1✔
281	mockEntry: Stuntman.WithRequiredProperty<Stuntman.LogEntry, 'modifiedRequest'>,	1✔
282	logContext: any	1✔
283	) {	1✔
284	let controller: AbortController \| null = new AbortController();	1✔
285	const fetchTimeout = setTimeout(() => {	1✔
286	if (controller) {	×
287	controller.abort(`timeout after ${this.options.mock.timeout}`);	×
288	}	×
289	}, this.options.mock.timeout);	1✔
290	req.on('close', () => {	1✔
291	logger.debug(logContext, 'remote client canceled the request');	×
292	clearTimeout(fetchTimeout);	×
293	if (controller) {	×
294	controller.abort('remote client canceled the request');	×
295	}	×
296	});	1✔
297	let targetResponse: Dispatcher.ResponseData;	1✔
298	try {	1✔
299	const requestOptions = {	1✔
300	headers: mockEntry.modifiedRequest.rawHeaders,	1✔
301	body: mockEntry.modifiedRequest.body,	1✔
302	method: mockEntry.modifiedRequest.method,	1✔
303	};	1✔
304	logger.debug(	1✔
305	{	1✔
306	...logContext,	1✔
307	url: mockEntry.modifiedRequest.url,	1✔
308	...requestOptions,	1✔
309	},	1✔
310	'outgoing request attempt'	1✔
311	);	1✔
312	// TODO migrate to node-libcurl	1✔
313	targetResponse = await fetchRequest(mockEntry.modifiedRequest.url, requestOptions);	1✔
314	} catch (error) {	×
315	logger.error(	×
316	{ ...logContext, error: errorToLog(error as Error), request: mockEntry.modifiedRequest },	×
317	'error fetching'	×
318	);	×
319	throw error;	×
320	} finally {	×
321	controller = null;	×
322	clearTimeout(fetchTimeout);	×
323	}	×
324	const targetResponseBuffer = Buffer.from(await targetResponse.body.arrayBuffer());	×
325	return {	×
326	timestamp: Date.now(),	×
327	body: targetResponseBuffer.toString('binary'),	×
328	status: targetResponse.statusCode,	×
329	rawHeaders: RawHeaders.fromHeadersRecord(targetResponse.headers),	×
330	};	×
331	}	×
332		18✔
333	public start() {	18✔
334	this.init();	2✔
335	if (!this.mockApp) {	2!
336	throw new Error('initialization error');	×
337	}	×
338	if (this.server) {	2!
339	throw new Error('mock server already started');	×
340	}	×
341	if (this.options.mock.httpsPort) {	2✔
342	this.serverHttps = https	1✔
343	.createServer(	1✔
344	{	1✔
345	key: this.options.mock.httpsKey,	1✔
346	cert: this.options.mock.httpsCert,	1✔
347	},	1✔
348	this.mockApp	1✔
349	)	1✔
350	.listen(this.options.mock.httpsPort, () => {	1✔
351	logger.info(`Mock listening on ${this.options.mock.domain}:${this.options.mock.httpsPort}`);	×
352	});	1✔
353	}	1✔
354	this.server = this.mockApp.listen(this.options.mock.port, () => {	2✔
355	logger.info(`Mock listening on ${this.options.mock.domain}:${this.options.mock.port}`);	×
356	if (!this.options.api.disabled) {	×
357	this.apiServer?.start();	×
358	}	×
359	});	2✔
360	}	2✔
361		18✔
362	public async stop(): Promise<void> {	18✔
363	const closePromises: Promise<void>[] = [];	3✔
364	if (!this.server) {	3✔
365	throw new Error('mock server not started');	1✔
366	}	1✔
367	if (!this.options.api.disabled) {	2✔
368	if (!this.apiServer) {	2!
369	logger.warn('no api server');	×
370	} else {	2✔
371	closePromises.push(	2✔
372	new Promise<void>((resolve) => {	2✔
373	if (!this.apiServer) {	2!
374	resolve();	×
375	return;	×
376	}	×
377	this.apiServer	2✔
378	.stop()	2✔
379	.then(() => resolve())	2✔
380	.catch((error) => {	2✔
381	logger.error(error, 'problem closing api server');	2✔
382	resolve();	2✔
383	});	2✔
384	})	2✔
385	);	2✔
386	}	2✔
387	}	2✔
388	closePromises.push(	2✔
389	new Promise<void>((resolve) => {	2✔
390	if (!this.server) {	2!
391	resolve();	×
392	return;	×
393	}	×
394	this.server.close((error) => {	2✔
395	if (error) {	2!
396	logger.warn(error, 'problem closing http server');	×
397	}	×
398	this.server = null;	2✔
399	resolve();	2✔
400	});	2✔
401	})	2✔
402	);	2✔
403	if (this.serverHttps) {	3✔
404	closePromises.push(	1✔
405	new Promise<void>((resolve) => {	1✔
406	if (!this.serverHttps) {	1!
407	resolve();	×
408	return;	×
409	}	×
410	this.serverHttps.close((error) => {	1✔
411	if (error) {	1!
412	logger.warn(error, 'problem closing https server');	×
413	}	×
414	this.server = null;	1✔
415	resolve();	1✔
416	});	1✔
417	})	1✔
418	);	1✔
419	}	1✔
420	await Promise.all(closePromises);	2✔
421	}	2✔
422		18✔
423	protected unproxyRequest(req: express.Request): Stuntman.BaseRequest {	18✔
424	const protocol = (this.MOCK_DOMAIN_REGEX.exec(req.hostname) \|\| [])[2] \|\| req.protocol;	8✔
425	const port = (this.MOCK_DOMAIN_REGEX.exec(req.hostname) \|\| [])[1] \|\| undefined;	8✔
426		8✔
427	if (!HTTP_METHODS.includes(req.method.toUpperCase() as Stuntman.HttpMethod)) {	8✔
428	throw new Error(`unrecognized http method "${req.method}"`);	1✔
429	}	1✔
430		7✔
431	// TODO unproxied req might fail if there's a signed url :shrug:	7✔
432	// but then we can probably switch DNS for some particular 3rd party server to point to mock	7✔
433	// and in mock have a mapping rule for that domain to point directly to some IP :thinking:	7✔
434	return {	7✔
435	url: `${protocol}://${req.hostname.replace(this.MOCK_DOMAIN_REGEX, '')}${port ? `:${port}` : ''}${req.originalUrl}`,	8✔
436	rawHeaders: new RawHeaders(	8✔
437	...req.rawHeaders.map((h) => {	8✔
438	let outputHeader = h;	30✔
439	if (this.MOCK_DOMAIN_REGEX.test(outputHeader)) {	30✔
440	outputHeader = outputHeader.replace(this.MOCK_DOMAIN_REGEX, '').replace(/^https?/i, protocol);	12✔
441	}	12✔
442	return outputHeader;	30✔
443	})	8✔
444	),	8✔
445	method: req.method.toUpperCase() as Stuntman.HttpMethod,	8✔
446	...(Buffer.isBuffer(req.body) && { body: req.body.toString('utf-8') }),	8✔
447	};	8✔
448	}	8✔
449		18✔
450	protected removeProxyPort(req: Stuntman.Request): void {	18✔
451	if (this.URL_PORT_REGEX.test(req.url)) {	5✔
452	req.url = req.url.replace(this.URL_PORT_REGEX, '$1$2');	3✔
453	}	3✔
454	const host = req.rawHeaders.get('host') \|\| '';	5✔
455	if (	5✔
456	host.endsWith(`:${this.options.mock.port}`) \|\|	5✔
457	(this.options.mock.httpsPort && host.endsWith(`:${this.options.mock.httpsPort}`))	4✔
458	) {	5✔
459	req.rawHeaders.set('host', host.split(':')[0]!);	2✔
460	}	2✔
461	}	5✔
462	}	18✔

andrzej-woof / stuntman / 8908908344

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