feat: 添加中间件

src/axios.ts

@@ -84,7 +84,9 @@ function createInstance(config: AxiosRequestConfig) {
 const axios = createInstance(defaults) as AxiosStatic;
 
 axios.create = function create(config) {
-  return createInstance(mergeConfig(axios.defaults, config));
+  const instance = createInstance(mergeConfig(axios.defaults, config));
+  instance.flush = axios.middleware.wrap(instance.flush);
+  return instance;
 };
 
 axios.version = version;

src/constants/methods.ts

@@ -16,4 +16,7 @@ export const WITH_DATA_METHODS = ['post', 'put', 'patch'] as const;
 /**
  * 可以携带 data 的请求方法
  */
-export const WITH_DATA_RE = new RegExp(`^${WITH_DATA_METHODS.join('|')}`, 'i');
+export const WITH_DATA_RE = new RegExp(
+  `^(${WITH_DATA_METHODS.join('|')})`,
+  'i',
+);

src/core/Axios.ts

@@ -1,9 +1,6 @@
 import { buildURL } from '../helpers/buildURL';
-import { isAbsoluteURL } from '../helpers/isAbsoluteURL';
 import { combineURL } from '../helpers/combineURL';
-import { isString } from '../helpers/isTypes';
 import { CancelToken } from '../request/cancel';
-import { dispatchRequest } from '../request/dispatchRequest';
 import { AxiosTransformer } from '../request/transformData';
 import {
   AxiosAdapter,
@@ -14,7 +11,7 @@ import {
 } from '../adpater/createAdapter';
 import InterceptorManager, { Interceptor } from './InterceptorManager';
 import { mergeConfig } from './mergeConfig';
-import AxiosDomain from './AxiosDomain';
+import AxiosDomain, { AxiosDomainRequestHandler } from './AxiosDomain';
 
 /**
  * 请求方法
@@ -319,7 +316,7 @@ export default class Axios extends AxiosDomain {
   };
 
   constructor(defaults: AxiosRequestConfig = {}) {
-    super(defaults, (config) => this.#processRequest(config));
+    super(defaults, (...args) => this.#processRequest(...args));
   }
 
   getUri(config: AxiosRequestConfig): string {
@@ -334,17 +331,21 @@ export default class Axios extends AxiosDomain {
    * 派生领域
    */
   fork = (config: AxiosRequestConfig = {}) => {
-    if (isString(config.baseURL) && !isAbsoluteURL(config.baseURL)) {
-      config.baseURL = combineURL(this.defaults.baseURL, config.baseURL);
-    }
-    return new AxiosDomain(mergeConfig(this.defaults, config), (config) =>
-      this.#processRequest(config),
+    config.baseURL = combineURL(this.defaults.baseURL, config.baseURL);
+    const domain = new AxiosDomain(
+      mergeConfig(this.defaults, config),
+      (...args) => this.#processRequest(...args),
     );
+    domain.flush = this.middleware.wrap(domain.flush);
+    return domain;
   };
 
-  #processRequest(config: AxiosRequestConfig) {
+  #processRequest(
+    config: AxiosRequestConfig,
+    requestHandlerFn: AxiosDomainRequestHandler,
+  ) {
     const requestHandler = {
-      resolved: dispatchRequest,
+      resolved: requestHandlerFn,
     };
     const errorHandler = {
       rejected: config.errorHandler,

src/core/AxiosDomain.ts

@@ -5,6 +5,8 @@ import {
 } from '../constants/methods';
 import { isString, isUndefined } from '../helpers/isTypes';
 import { deepMerge } from '../helpers/deepMerge';
+import { combineURL } from '../helpers/combineURL';
+import { dispatchRequest } from '../request/dispatchRequest';
 import { mergeConfig } from './mergeConfig';
 import {
   AxiosRequestConfig,
@@ -12,6 +14,10 @@ import {
   AxiosResponse,
   AxiosResponseData,
 } from './Axios';
+import MiddlewareManager, {
+  MiddlewareContext,
+  MiddlewareFlush,
+} from './MiddlewareManager';
 
 /**
  * 请求函数
@@ -56,12 +62,18 @@ export type AxiosDomainRequestMethodWithData = <
   config?: AxiosRequestConfig,
 ) => Promise<AxiosResponse<TData>>;
 
+export interface AxiosDomainRequestHandler {
+  (config: AxiosRequestConfig): Promise<AxiosResponse>;
+}
+
 export default class AxiosDomain {
   /**
    * 默认请求配置
    */
   defaults: AxiosRequestConfig;
 
+  middleware = new MiddlewareManager();
+
   /**
    * 发送请求
    */
@@ -112,9 +124,14 @@ export default class AxiosDomain {
    */
   connect!: AxiosDomainRequestMethod;
 
+  flush: MiddlewareFlush;
+
   constructor(
     defaults: AxiosRequestConfig,
-    processRequest: (config: AxiosRequestConfig) => Promise<AxiosResponse>,
+    processRequest: (
+      config: AxiosRequestConfig,
+      requestHandler: AxiosDomainRequestHandler,
+    ) => Promise<AxiosResponse>,
   ) {
     this.defaults = defaults;
 
@@ -132,9 +149,25 @@ export default class AxiosDomain {
         config.method = 'get';
       }
 
-      return processRequest(mergeConfig(this.defaults, config));
+      return processRequest(
+        mergeConfig(this.defaults, config),
+        this.#requestHandler,
+      );
     };
+    this.flush = this.middleware.wrap(async (ctx) => {
+      ctx.res = await dispatchRequest(ctx.req);
+    });
   }
+
+  #requestHandler: AxiosDomainRequestHandler = async (config) => {
+    config.url = combineURL(config.baseURL, config.url);
+    const ctx: MiddlewareContext = {
+      req: config,
+      res: null,
+    };
+    await this.flush(ctx);
+    return ctx.res as AxiosResponse;
+  };
 }
 
 for (const method of PLAIN_METHODS) {

src/core/MiddlewareManager.ts

@@ -0,0 +1,70 @@
+import { assert } from '../helpers/error';
+import { combineURL } from '../helpers/combineURL';
+import { isFunction } from '../helpers/isTypes';
+import { AxiosRequestConfig, AxiosResponse } from './Axios';
+
+export interface MiddlewareContext {
+  req: AxiosRequestConfig;
+  res: null | AxiosResponse;
+}
+
+export interface MiddlewareNext {
+  (): Promise<void>;
+}
+
+export interface MiddlewareCallback {
+  (ctx: MiddlewareContext, next: MiddlewareNext): Promise<void>;
+}
+
+export interface MiddlewareFlush {
+  (ctx: MiddlewareContext): Promise<void>;
+}
+
+export default class MiddlewareManager {
+  #map = new Map<string, MiddlewareCallback[]>();
+
+  use(callback: MiddlewareCallback): MiddlewareManager;
+  use(path: string, callback: MiddlewareCallback): MiddlewareManager;
+  use(path: string | MiddlewareCallback, callback?: MiddlewareCallback) {
+    if (isFunction(path)) {
+      callback = path;
+      path = '/';
+    }
+    assert(!!path, 'path 不是一个非空的 string');
+
+    const middlewares = this.#map.get(path) ?? [];
+    middlewares.push(callback!);
+    this.#map.set(path, middlewares);
+
+    return this;
+  }
+
+  wrap(flush: MiddlewareFlush): MiddlewareFlush {
+    return (ctx) => this.#performer(ctx, flush);
+  }
+
+  #performer(ctx: MiddlewareContext, flush: MiddlewareFlush) {
+    const middlewares = [...this.#getAllMiddlewares(ctx), flush];
+
+    function next(): Promise<void> {
+      return middlewares.shift()!(ctx, next);
+    }
+
+    return next();
+  }
+
+  #getAllMiddlewares(ctx: MiddlewareContext) {
+    const allMiddlewares: MiddlewareCallback[] = [];
+
+    for (const [path, middlewares] of this.#map.entries()) {
+      const url = combineURL(ctx.req.baseURL, path);
+
+      const checkRE = new RegExp(`^${url}([/?].*)?`);
+      if (checkRE.test(ctx.req.url!)) {
+        allMiddlewares.push(...middlewares);
+      }
+    }
+
+    return allMiddlewares;
+  }
+}

src/helpers/combineURL.ts

@@ -1,5 +1,10 @@
+import { isAbsoluteURL } from './isAbsoluteURL';
+
 const combineRE = /(^|[^:])\/{2,}/g;
 const removeRE = /\/$/;
 export function combineURL(baseURL = '', url = ''): string {
+  if (isAbsoluteURL(url)) {
+    return url;
+  }
   return `${baseURL}/${url}`.replace(combineRE, '$1/').replace(removeRE, '');
 }

src/index.ts

@@ -14,6 +14,11 @@ export type {
   AxiosUploadProgressEvent,
   AxiosUploadProgressCallback,
 } from './core/Axios';
+export type {
+  MiddlewareContext,
+  MiddlewareCallback,
+  MiddlewareNext,
+} from './core/MiddlewareManager';
 export type {
   AxiosAdapter,
   AxiosAdapterRequestConfig,

src/request/dispatchRequest.ts

@@ -27,7 +27,6 @@ export function dispatchRequest(config: AxiosRequestConfig) {
   assert(isString(config.url), 'url 不是一个 string');
   assert(isString(config.method), 'method 不是一个 string');
 
-  config.url = transformURL(config);
   config.method = config.method!.toUpperCase() as AxiosRequestMethod;
   config.headers = flattenHeaders(config);
 
@@ -39,6 +38,8 @@ export function dispatchRequest(config: AxiosRequestConfig) {
     delete config.data;
   }
 
+  config.url = transformURL(config);
+
   function onSuccess(response: AxiosResponse) {
     throwIfCancellationRequested(config);
     dataTransformer(response, config.transformResponse);

src/request/request.ts

@@ -6,7 +6,6 @@ import {
 } from '../core/Axios';
 import {
   AxiosAdapterRequestConfig,
-  AxiosAdapterRequestMethod,
   AxiosAdapterResponse,
   AxiosAdapterResponseError,
   AxiosAdapterPlatformTask,

src/request/transformURL.ts

@@ -2,15 +2,14 @@ import { isPlainObject } from '../helpers/isTypes';
 import { buildURL } from '../helpers/buildURL';
 import { combineURL } from '../helpers/combineURL';
 import { dynamicURL } from '../helpers/dynamicURL';
-import { isAbsoluteURL } from '../helpers/isAbsoluteURL';
 import { AxiosRequestConfig } from '../core/Axios';
 
 export function transformURL(config: AxiosRequestConfig) {
-  let url = config.url ?? '';
-
-  if (!isAbsoluteURL(url)) url = combineURL(config.baseURL ?? '', url);
-
   const data = isPlainObject(config.data) ? config.data : {};
+
+  let url = config.url ?? '/';
+
+  url = combineURL(config.baseURL ?? '', url);
   url = dynamicURL(url, config.params, data);
   url = buildURL(url, config.params, config.paramsSerializer);
 

test/axios.test.ts

@@ -37,6 +37,7 @@ describe('src/axios.ts', () => {
         },
       }),
       baseURL: 'http://api.com',
+      method: 'post',
       data: {
         id: 1,
       },

test/core/MiddlewareManager.test.ts

@@ -0,0 +1,78 @@
+import { describe, test, expect, vi } from 'vitest';
+import MiddlewareManager from '@/core/MiddlewareManager';
+
+describe('src/core/MiddlewareManager.ts', () => {
+  test('应该有这些实例属性', () => {
+    const m = new MiddlewareManager();
+
+    expect(m.use).toBeTypeOf('function');
+    expect(m.wrap).toBeTypeOf('function');
+  });
+
+  test('应该可以添加中间件回调', async () => {
+    const m = new MiddlewareManager();
+    const ctx = {
+      req: { url: 'https://api.com' },
+      res: null,
+    };
+    const res = {
+      'src/core/MiddlewareManager.ts': true,
+    };
+    const midde = vi.fn(async (ctx, next) => {
+      expect(ctx).toBe(ctx);
+      ctx.req.url = 'test';
+      await next();
+      expect(ctx.res).toBe(res);
+    });
+    const flush = vi.fn(async (ctx) => {
+      expect(ctx.req.url).toBe('test');
+      ctx.res = res;
+    });
+
+    m.use(midde);
+    await m.wrap(flush)(ctx);
+
+    expect(ctx.res).toBe(res);
+    expect(midde).toBeCalled();
+  });
+
+  test('应该可以给路径添加中间件回调', async () => {
+    const m = new MiddlewareManager();
+    const ctx1 = {
+      req: {
+        baseURL: 'https://api.com',
+        url: 'https://api.com',
+      },
+      res: null,
+    };
+    const ctx2 = {
+      req: {
+        baseURL: 'https://api.com',
+        url: 'https://api.com/test',
+      },
+      res: null,
+    };
+    const res = {
+      'src/core/MiddlewareManager.ts': true,
+    };
+    const midde = vi.fn(async (ctx, next) => {
+      expect(ctx).toBe(ctx);
+      await next();
+      expect(ctx.res).toBe(res);
+    });
+    const flush = vi.fn(async (ctx) => {
+      ctx.res = res;
+    });
+
+    m.use('/test', midde);
+    await m.wrap(flush)(ctx1);
+
+    expect(ctx1.res).toBe(res);
+    expect(midde).not.toBeCalled();
+
+    m.use('/test', midde);
+    await m.wrap(flush)(ctx2);
+
+    expect(midde).toBeCalled();
+  });
+});

test/helpers/combineURL.test.ts

@@ -14,6 +14,12 @@ describe('src/helpers/combineURL.ts', () => {
     expect(combineURL('unknow://api.com', '')).toBe('unknow://api.com');
   });
 
+  test('应该直接返回第二个参数', () => {
+    expect(combineURL('', 'http://api.com')).toBe('http://api.com');
+    expect(combineURL('', 'file://api.com')).toBe('file://api.com');
+    expect(combineURL('', 'unknow://api.com')).toBe('unknow://api.com');
+  });
+
   test('应该得到拼接后的结果', () => {
     expect(combineURL('http://api.com', 'test')).toBe('http://api.com/test');
     expect(combineURL('file://api.com', '/test')).toBe('file://api.com/test');

test/request/dispatchRequest.test.ts

@@ -100,6 +100,7 @@ describe('src/request/dispatchRequest.ts', () => {
     };
     const c3 = {
       ...defaults,
+      method: 'post' as const,
       url: 'test/:id',
       data: {
         id: 1,