RocketChat/Rocket.Chat

import type { Serialized } from '@rocket.chat/core-typings';
import type {
    MatchPathPattern,
    ParamsFor,
    OperationResult,
    PathFor,
    PathWithoutParamsFor,
    PathWithParamsFor,
} from '@rocket.chat/rest-typings';
import { stringify } from 'query-string';

import type { Credentials } from './Credentials';
import type { Middleware, RestClientInterface } from './RestClientInterface';
import { hasRequiredTwoFactorMethod, isTotpInvalidError, isTotpRequiredError } from './errors';

export { RestClientInterface, Credentials };

const pipe =
    <T extends (...args: any[]) => any>(fn: T) =>
    (...args: Parameters<T>): ReturnType<T> =>
        fn(...args);

function buildFormData(data?: Record<string, any> | void, formData = new FormData(), parentKey?: string): FormData {
    if (data instanceof FormData) {
        return data;
    }
    if (!data) {
        return formData;
    }

    if (typeof data === 'object' && !(data instanceof File)) {
        Object.keys(data).forEach((key) => {
            buildFormData(formData, data[key], parentKey ? `${parentKey}[${key}]` : key);
        });
    } else {
        data && parentKey && formData.append(parentKey, data);
    }
    return formData;
}

const checkIfIsFormData = (data: any = {}): boolean => {
    if (data instanceof FormData) {
        return true;
    }
    return Object.values(data).some((value) => {
        if (value && typeof value === 'object' && !(value instanceof File)) {
            return checkIfIsFormData(value);
        }
        return value instanceof File;
    });
};

export class RestClient implements RestClientInterface {
    private twoFactorHandler?: (args: {
        method: 'totp' | 'email' | 'password';
        emailOrUsername?: string;
        invalidAttempt?: boolean;
    }) => Promise<string>;

    private readonly baseUrl: string;

    private headers: Record<string, string> = {};

    private credentials: Credentials | undefined;

    constructor({ baseUrl, credentials, headers = {} }: { baseUrl: string; credentials?: Credentials; headers?: Record<string, string> }) {
        this.baseUrl = `${baseUrl}/api`;
        this.setCredentials(credentials);
        this.headers = headers;
    }

    getCredentials(): ReturnType<RestClientInterface['getCredentials']> {
        return this.credentials;
    }

    setCredentials: RestClientInterface['setCredentials'] = (credentials) => {
        this.credentials = credentials;
    };

    get<TPathPattern extends MatchPathPattern<TPath>, TPath extends PathWithParamsFor<'GET'> = PathWithParamsFor<'GET'>>(
        endpoint: TPath,
        params: ParamsFor<'GET', TPathPattern>,
        options?: Omit<RequestInit, 'method'>,
    ): Promise<Serialized<OperationResult<'GET', TPathPattern>>>;

    get<TPathPattern extends MatchPathPattern<TPath>, TPath extends PathWithoutParamsFor<'GET'> = PathWithoutParamsFor<'GET'>>(
        endpoint: TPath,
        params?: undefined,
        options?: Omit<RequestInit, 'method'>,
    ): Promise<Serialized<OperationResult<'GET', TPathPattern>>>;

    async get<TPathPattern extends MatchPathPattern<TPath>, TPath extends PathFor<'GET'>>(
        endpoint: TPath,
        params?: ParamsFor<'GET', TPathPattern>,
        options?: Omit<RequestInit, 'method'>,
    ): Promise<Serialized<OperationResult<'GET', TPathPattern>>> {
        if (/\?/.test(endpoint)) {
            // throw new Error('Endpoint cannot contain query string');
            console.warn('Endpoint cannot contain query string', endpoint);
        }
        const queryParams = this.getParams(params);
        const response = await this.send(`${endpoint}${queryParams ? `?${queryParams}` : ''}`, 'GET', options ?? {});
        return response.json();
    }

    post<TPathPattern extends MatchPathPattern<TPath>, TPath extends PathWithParamsFor<'POST'> = PathWithParamsFor<'POST'>>(
        endpoint: TPath,
        params: ParamsFor<'POST', TPathPattern>,
        options?: Omit<RequestInit, 'method'>,
    ): Promise<Serialized<OperationResult<'POST', TPathPattern>>>;

    post<TPathPattern extends MatchPathPattern<TPath>, TPath extends PathWithoutParamsFor<'POST'> = PathWithoutParamsFor<'POST'>>(
        endpoint: TPath,
        params?: undefined,
        options?: Omit<RequestInit, 'method'>,
    ): Promise<Serialized<OperationResult<'POST', TPathPattern>>>;

    async post<TPathPattern extends MatchPathPattern<TPath>, TPath extends PathFor<'POST'>>(
        endpoint: TPath,
        params?: ParamsFor<'POST', TPathPattern>,
        { headers, ...options }: Omit<RequestInit, 'method'> = {},
    ): Promise<Serialized<OperationResult<'POST', TPathPattern>>> {
        const isFormData = checkIfIsFormData(params);

        const response = await this.send(endpoint, 'POST', {
            body: isFormData ? buildFormData(params) : JSON.stringify(params),

            headers: {
                Accept: 'application/json',
                ...(!isFormData && { 'Content-Type': 'application/json' }),
                ...headers,
            },

            ...options,
        });

        // If the server sent no data, return an empty record as we're only expecting objects.
        if (response.status === 204) {
            return {} as any;
        }

        return response.json();
    }

    put<TPathPattern extends MatchPathPattern<TPath>, TPath extends PathWithParamsFor<'PUT'> = PathWithParamsFor<'PUT'>>(
        endpoint: TPath,
        params: ParamsFor<'PUT', TPathPattern>,
        options?: Omit<RequestInit, 'method'>,
    ): Promise<Serialized<OperationResult<'PUT', TPathPattern>>>;

    put<TPathPattern extends MatchPathPattern<TPath>, TPath extends PathWithoutParamsFor<'PUT'> = PathWithoutParamsFor<'PUT'>>(
        endpoint: TPath,
        params?: undefined,
        options?: Omit<RequestInit, 'method'>,
    ): Promise<Serialized<OperationResult<'PUT', TPathPattern>>>;

    async put<TPathPattern extends MatchPathPattern<TPath>, TPath extends PathFor<'PUT'>>(
        endpoint: TPath,
        params?: ParamsFor<'PUT', TPathPattern>,
        { headers, ...options }: Omit<RequestInit, 'method'> = {},
    ): Promise<Serialized<OperationResult<'PUT', TPathPattern>>> {
        const isFormData = checkIfIsFormData(params);
        const response = await this.send(endpoint, 'PUT', {
            body: isFormData ? buildFormData(params) : JSON.stringify(params),

            headers: {
                Accept: 'application/json',
                ...(!isFormData && { 'Content-Type': 'application/json' }),
                ...headers,
            },

            ...options,
        });
        return response.json();
    }

    delete<TPathPattern extends MatchPathPattern<TPath>, TPath extends PathWithParamsFor<'DELETE'> = PathWithParamsFor<'DELETE'>>(
        endpoint: TPath,
        params: ParamsFor<'DELETE', TPathPattern>,
        options?: Omit<RequestInit, 'method'>,
    ): Promise<Serialized<OperationResult<'DELETE', TPathPattern>>>;

    delete<TPathPattern extends MatchPathPattern<TPath>, TPath extends PathWithoutParamsFor<'DELETE'> = PathWithoutParamsFor<'DELETE'>>(
        endpoint: TPath,
        params?: undefined,
        options?: Omit<RequestInit, 'method'>,
    ): Promise<Serialized<OperationResult<'DELETE', TPathPattern>>>;

    async delete<TPathPattern extends MatchPathPattern<TPath>, TPath extends PathFor<'DELETE'>>(
        endpoint: TPath,
        _params?: ParamsFor<'DELETE', TPathPattern>,
        options: Omit<RequestInit, 'method'> = {},
    ): Promise<Serialized<OperationResult<'DELETE', TPathPattern>>> {
        const response = await this.send(endpoint, 'DELETE', options ?? {});
        return response.json();
    }

    protected getCredentialsAsHeaders(): Record<string, string> {
        const credentials = this.getCredentials();
        return credentials
            ? {
                    'X-User-Id': credentials['X-User-Id'],
                    'X-Auth-Token': credentials['X-Auth-Token'],
              }
            : {};
    }

    send(endpoint: string, method: string, { headers, ...options }: Omit<RequestInit, 'method'> = {}): Promise<Response> {
        return fetch(`${this.baseUrl}${`/${endpoint}`.replace(/\/+/, '/')}`, {
            ...options,
            headers: { ...this.getCredentialsAsHeaders(), ...this.headers, ...headers },
            method,
        }).then(async (response) => {
            if (response.ok) {
                return response;
            }

            if (response.status !== 400) {
                return Promise.reject(response);
            }

            const clone = response.clone();

            const error = await clone.json();

            if ((isTotpRequiredError(error) || isTotpInvalidError(error)) && hasRequiredTwoFactorMethod(error) && this.twoFactorHandler) {
                const method2fa = 'details' in error ? error.details.method : 'password';

                const code = await this.twoFactorHandler({
                    method: method2fa,
                    emailOrUsername: error.details.emailOrUsername,
                    invalidAttempt: isTotpInvalidError(error),
                });

                return this.send(endpoint, method, {
                    ...options,
                    headers: {
                        ...this.getCredentialsAsHeaders(),
                        ...this.headers,
                        ...headers,
                        'x-2fa-code': code,
                        'x-2fa-method': method2fa,
                    },
                });
            }

            return Promise.reject(response);
        });
    }

    protected getParams(data: Record<string, object | number | string | boolean> | void): string {
        return data ? stringify(data, { arrayFormat: 'bracket' }) : '';
    }

    upload: RestClientInterface['upload'] = (endpoint, params, events, options = {}) => {
        if (!params) {
            throw new Error('Missing params');
        }
        const xhr = new XMLHttpRequest();
        const data = new FormData();

        Object.entries(params as any).forEach(([key, value]) => {
            if (value instanceof File) {
                data.append(key, value, value.name);
                return;
            }
            value && data.append(key, value as any);
        });

        xhr.open('POST', `${this.baseUrl}${`/${endpoint}`.replace(/\/+/, '/')}`, true);
        Object.entries({ ...this.getCredentialsAsHeaders(), ...options.headers }).forEach(([key, value]) => {
            xhr.setRequestHeader(key, value);
        });

        if (events?.load) {
            xhr.upload.addEventListener('load', events.load);
        }
        if (events?.progress) {
            xhr.upload.addEventListener('progress', events.progress);
        }
        if (events?.error) {
            xhr.addEventListener('error', events.error);
        }
        if (events?.abort) {
            xhr.addEventListener('abort', events.abort);
        }

        xhr.send(data);

        return xhr;
    };

    use(middleware: Middleware<RestClientInterface['send']>): void {
        const fn = this.send.bind(this);
        this.send = function (this: RestClient, ...context: Parameters<RestClientInterface['send']>): ReturnType<RestClientInterface['send']> {
            return middleware(context, pipe(fn));
        } as RestClientInterface['send'];
    }

    handleTwoFactorChallenge(
        cb: (args: { method: 'totp' | 'email' | 'password'; emailOrUsername?: string; invalidAttempt?: boolean }) => Promise<string>,
    ): void {
        this.twoFactorHandler = cb;
    }
}