Created
November 30, 2022 06:27
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Rest Client with Bearer token authorization
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| type Method = 'get' | 'post' | 'patch' | 'put' | 'delete' | 'head' | |
| type IdempotentMethod = 'get' | 'head' | 'delete' | |
| type MutationMethod = Exclude<Method, IdempotentMethod> | |
| type IdempotentClient = (path: string, query?: URLSearchParams, headers?: HeadersInit) => Promise<Response> | |
| type MutationClient = (path: string, body: any, headers?: HeadersInit) => Promise<Response> | |
| type IdempotentClients = Record<IdempotentMethod, IdempotentClient> | |
| type MutationClients = Record<MutationMethod, MutationClient> | |
| type _RequestClient = IdempotentClients & MutationClients | |
| type RequestClient = _RequestClient & { | |
| withAuth: (token: string) => _RequestClient | |
| } | |
| export const createRestClient = (baseUrl: string, bearerTokenHeader: string = 'authorization'): RequestClient => { | |
| const withJson = (headers?: HeadersInit): HeadersInit => ({ | |
| 'Content-Type': 'application/json', | |
| ...(headers || {}) | |
| }) | |
| const withAuthorization = (token: string, headers?: HeadersInit): HeadersInit => ({ | |
| [bearerTokenHeader]: 'Bearer ' + token, | |
| ...(headers || {}) | |
| }) | |
| const idempotentMethods = ['get', 'head', 'delete'] as const | |
| const mutationMethods = ['post', 'patch', 'put'] as const | |
| const factoryReducer = <T extends string, C>(factory: (method: T) => C) => (memo: Record<T, C>, method: T) => { | |
| memo[method] = factory(method) | |
| return memo | |
| } | |
| const request = (path: string, init: RequestInit, query?: URLSearchParams) => { | |
| const url = `${baseUrl}${path}${query ? `?${query}` : ''}` | |
| return fetch(url, init) | |
| } | |
| const idempotentClientFactory = (method: IdempotentMethod): IdempotentClient => (path, query, headers) => request(path, { method, headers }, query) | |
| const mutationClientFactory = (method: MutationMethod): MutationClient => (path, body, headers) => request(path, { method, headers: withJson(headers), body: JSON.stringify(body) }) | |
| const _client: _RequestClient = { | |
| ...idempotentMethods.reduce(factoryReducer(idempotentClientFactory), {} as IdempotentClients), | |
| ...mutationMethods.reduce(factoryReducer(mutationClientFactory), {} as MutationClients), | |
| } | |
| function withAuthClientFactory<T extends Method>(token: string): (method: T) => T extends IdempotentMethod ? IdempotentClient : MutationClient { | |
| return (method: T) => (path, bodyOrQuery, headers) => _client[method](path, bodyOrQuery, withAuthorization(token, headers)) | |
| } | |
| return { | |
| ..._client, | |
| withAuth(token) { | |
| return { | |
| ...idempotentMethods.reduce(factoryReducer(withAuthClientFactory(token)), {} as IdempotentClients), | |
| ...mutationMethods.reduce(factoryReducer(withAuthClientFactory(token)), {} as MutationClients), | |
| } | |
| }, | |
| } | |
| } |
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