feat(rpc): init network package

packages/network/README.md

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+# @univerjs/network
+
+## Introduction
+
+This plugin provides network services to other modules of Univer.
+
+## Usage
+
+### Installation
+
+```shell
+npm i @univerjs/network
+```
+
+### API
+
+Check [Univer](https://github.com/dream-num/univer/)

packages/network/package.json

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+{
+    "name": "@univerjs/network",
+    "private": true,
+    "main": "./src/index.ts",
+    "module": "./src/index.ts",
+    "dependencies": {
+        "@univerjs/core": "workspace:*",
+        "@wendellhu/redi": "^0.12.10",
+        "rxjs": "^7.8.1"
+    }
+}

packages/network/src/index.ts

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+export { HTTPHeaders } from './services/http/headers';
+export { HTTPService } from './services/http/http.service';
+export { XHRHTTPImplementation } from './services/http/implementations/xhr';
+export { HTTPRequest } from './services/http/request';
+export { HTTPResponse } from './services/http/response';
+export { type ISocket, ISocketService, WebSocketService } from './services/web-socket/web-socket.service';

packages/network/src/services/http/headers.ts

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+interface IHeadersConstructorProps {
+    [key: string]: string | number | boolean;
+}
+
+/**
+ * It wraps headers of HTTP requests' and responses' headers.
+ */
+export class HTTPHeaders {
+    private readonly _headers: { [key: string]: string[] } = {};
+
+    constructor(headers?: IHeadersConstructorProps | string) {
+        if (typeof headers === 'string') {
+            // split header text and serialize them to HTTPHeaders
+            headers.split('\n').forEach((header) => {
+                const [name, value] = header.split(':');
+                if (name && value) {
+                    this._setHeader(name, value);
+                }
+            });
+        } else {
+            if (headers) {
+                Object.keys(headers).forEach(([name, value]) => {
+                    this._setHeader(name, value);
+                });
+            }
+        }
+    }
+
+    forEach(callback: (name: string, value: string[]) => void): void {
+        Object.keys(this._headers).forEach((name) => {
+            callback(name, this._headers[name]);
+        });
+    }
+
+    private _setHeader(name: string, value: string | number | boolean): void {
+        const lowerCase = name.toLowerCase();
+        if (this._headers[lowerCase]) {
+            this._headers[lowerCase].push(value.toString());
+        } else {
+            this._headers[lowerCase] = [value.toString()];
+        }
+    }
+}

packages/network/src/services/http/http.service.ts

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+import { Disposable, Nullable, remove, toDisposable } from '@univerjs/core';
+import { IDisposable } from '@wendellhu/redi';
+import { firstValueFrom, Observable, of } from 'rxjs';
+import { concatMap } from 'rxjs/operators';
+
+import { HTTPHeaders } from './headers';
+import { HTTPResponseType } from './http';
+import { IHTTPImplementation } from './implementations/implementation';
+import { HTTPParams } from './params';
+import { HTTPRequest, HTTPRequestMethod } from './request';
+import { HTTPEvent, HTTPResponse, HTTPResponseError } from './response';
+
+// TODO: error handling of HTTPService should be strengthened.
+
+export interface IRequestParams {
+    /** Query params. These params would be append to the url before the request is sent. */
+    params?: { [param: string]: string | number | boolean };
+    headers?: { [key: string]: string | number | boolean };
+    responseType?: HTTPResponseType;
+    withCredentials?: boolean;
+}
+
+export interface IPostRequestParams extends IRequestParams {
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    body?: any;
+}
+
+type HTTPHandlerFn = (request: HTTPRequest) => Observable<HTTPEvent<unknown>>;
+type HTTPInterceptorFn = (request: HTTPRequest, next: HTTPHandlerFn) => Observable<HTTPEvent<unknown>>;
+type RequestPipe<T> = (req: HTTPRequest, finalHandlerFn: HTTPHandlerFn) => Observable<HTTPEvent<T>>;
+
+/**
+ * Register an HTTP interceptor. Interceptor could modify requests, responses, headers or errors.
+ */
+export interface IHTTPInterceptor {
+    priority?: number;
+    interceptor: HTTPInterceptorFn;
+}
+
+export class HTTPService extends Disposable {
+    private _interceptors: IHTTPInterceptor[] = [];
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    private _pipe: Nullable<RequestPipe<any>>;
+
+    constructor(@IHTTPImplementation private readonly _http: IHTTPImplementation) {
+        super();
+    }
+
+    registerHTTPInterceptor(interceptor: IHTTPInterceptor): IDisposable {
+        if (this._interceptors.indexOf(interceptor) !== -1) {
+            throw new Error('[HTTPService]: The interceptor has already been registered!');
+        }
+
+        this._interceptors.push(interceptor);
+        this._interceptors = this._interceptors.sort((a, b) => (a.priority ?? 0) - (b.priority ?? 0));
+
+        this._pipe = null;
+
+        return toDisposable(() => remove(this._interceptors, interceptor));
+    }
+
+    get<T>(url: string, options?: IRequestParams): Promise<HTTPResponse<T>> {
+        return this._request<T>('GET', url, options);
+    }
+
+    post<T>(url: string, options?: IPostRequestParams): Promise<HTTPResponse<T>> {
+        return this._request<T>('POST', url, options);
+    }
+
+    put<T>(url: string, options?: IPostRequestParams): Promise<HTTPResponse<T>> {
+        return this._request<T>('PUT', url, options);
+    }
+
+    delete<T>(url: string, options?: IRequestParams): Promise<HTTPResponse<T>> {
+        return this._request<T>('DELETE', url, options);
+    }
+
+    /** The HTTP request implementations */
+    private async _request<T>(
+        method: HTTPRequestMethod,
+        url: string,
+        options?: IRequestParams
+    ): Promise<HTTPResponse<T>> {
+        // Things to do when sending a HTTP request:
+        // 1. Generate HTTPRequest/HTTPHeader object
+        // 2. Call interceptors and finally the HTTP implementation.
+        const headers = new HTTPHeaders(options?.headers);
+        const params = new HTTPParams(options?.params);
+        const request = new HTTPRequest(method, url, {
+            headers,
+            params,
+            withCredentials: options?.withCredentials ?? false, // default value for withCredentials is false by MDN
+            responseType: options?.responseType ?? 'json',
+        });
+
+        const events$: Observable<HTTPEvent<any>> = of(request).pipe(
+            concatMap((request) => this._runInterceptorsAndImplementation(request))
+        );
+
+        // The event$ may emit multiple values, but we only care about the first one.
+        // We may need to care about other events (especially progress events) in the future.
+        const result = await firstValueFrom(events$);
+        if (result instanceof HTTPResponse) {
+            return result;
+        }
+
+        throw new Error(`${(result as HTTPResponseError).error}`);
+    }
+
+    private _runInterceptorsAndImplementation(request: HTTPRequest): Observable<HTTPEvent<any>> {
+        // In this method we first call all interceptors and finally the HTTP implementation.
+        // And the HTTP response will be passed back through the interceptor chain.
+        if (!this._pipe) {
+            this._pipe = this._interceptors
+                .map((handler) => handler.interceptor)
+                .reduceRight(
+                    (nextHandlerFunction, interceptorFunction: HTTPInterceptorFn) =>
+                        chainInterceptorFn(nextHandlerFunction, interceptorFunction),
+                    (requestFromPrevInterceptor, finalHandler) => finalHandler(requestFromPrevInterceptor)
+                );
+        }
+
+        return this._pipe!(request, (requestToNext) => this._http.send(requestToNext) /* final handler */);
+    }
+}
+
+function chainInterceptorFn(afterInterceptorChain: HTTPInterceptorFn, currentInterceptorFn: HTTPInterceptorFn) {
+    return (prevRequest: HTTPRequest, nextHandlerFn: HTTPHandlerFn) =>
+        currentInterceptorFn(prevRequest, (nextRequest) => afterInterceptorChain(nextRequest, nextHandlerFn));
+}

packages/network/src/services/http/http.ts

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+/* eslint-disable no-magic-numbers */
+
+export type HTTPResponseType = 'arraybuffer' | 'blob' | 'json' | 'text';
+
+export const SuccessStatusCodeLowerBound = 200;
+
+export const ErrorStatusCodeLowerBound = 300;
+
+/**
+ * Http status codes.
+ *
+ * https://www.iana.org/assignments/http-status-codes/http-status-codes.xhtml
+ */
+export enum HTTPStatusCode {
+    Continue = 100,
+    SwitchingProtocols = 101,
+    Processing = 102,
+    EarlyHints = 103,
+
+    Ok = 200,
+    Created = 201,
+    Accepted = 202,
+    NonAuthoritativeInformation = 203,
+    NoContent = 204,
+    ResetContent = 205,
+    PartialContent = 206,
+    MultiStatus = 207,
+    AlreadyReported = 208,
+    ImUsed = 226,
+
+    MultipleChoices = 300,
+    MovedPermanently = 301,
+    Found = 302,
+    SeeOther = 303,
+    NotModified = 304,
+    UseProxy = 305,
+    Unused = 306,
+    TemporaryRedirect = 307,
+    PermanentRedirect = 308,
+
+    BadRequest = 400,
+    Unauthorized = 401,
+    PaymentRequired = 402,
+    Forbidden = 403,
+    NotFound = 404,
+    MethodNotAllowed = 405,
+    NotAcceptable = 406,
+    ProxyAuthenticationRequired = 407,
+    RequestTimeout = 408,
+    Conflict = 409,
+    Gone = 410,
+    LengthRequired = 411,
+    PreconditionFailed = 412,
+    PayloadTooLarge = 413,
+    UriTooLong = 414,
+    UnsupportedMediaType = 415,
+    RangeNotSatisfiable = 416,
+    ExpectationFailed = 417,
+    ImATeapot = 418,
+    MisdirectedRequest = 421,
+    UnprocessableEntity = 422,
+    Locked = 423,
+    FailedDependency = 424,
+    TooEarly = 425,
+    UpgradeRequired = 426,
+    PreconditionRequired = 428,
+    TooManyRequests = 429,
+    RequestHeaderFieldsTooLarge = 431,
+    UnavailableForLegalReasons = 451,
+
+    InternalServerError = 500,
+    NotImplemented = 501,
+    BadGateway = 502,
+    ServiceUnavailable = 503,
+    GatewayTimeout = 504,
+    HttpVersionNotSupported = 505,
+    VariantAlsoNegotiates = 506,
+    InsufficientStorage = 507,
+    LoopDetected = 508,
+    NotExtended = 510,
+    NetworkAuthenticationRequired = 511,
+}

packages/network/src/services/http/implementations/fetch.ts

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+// TODO

packages/network/src/services/http/implementations/implementation.ts

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+/* eslint-disable @typescript-eslint/no-explicit-any */
+import { createIdentifier } from '@wendellhu/redi';
+import { Observable } from 'rxjs';
+
+import { HTTPRequest } from '../request';
+import { HTTPEvent } from '../response';
+
+/**
+ * HTTP service could be implemented differently on platforms.
+ */
+export interface IHTTPImplementation {
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    // There may be stream response so the return value is an observable.
+    send(request: HTTPRequest): Observable<HTTPEvent<any>>;
+}
+export const IHTTPImplementation = createIdentifier<IHTTPImplementation>('univer-pro.network.http-implementation');