81 lines
3.3 KiB
TypeScript
81 lines
3.3 KiB
TypeScript
/**
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* @callback fetch
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* @param {RequestInfo} resource
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* @param {RequestInit} options
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* @returns {Promise<Response>}
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*/
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export default class WebStorage {
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#origin = new URL(import.meta.url).origin
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#auth_provider: import('@twurple/auth').AuthProvider = null;
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#cache: Cache = null
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#fetch: typeof globalThis.fetch = null
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/**
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* Creates a fetch request wrapper that returns cached responses when the server can't be reached.
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* When only a path is provided, the origin defaults to the same origin this module was loaded from.
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* When the origin matches this script, authorization headers are added automatically.
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* You can also use this for GET requests to any orgigin, but other methods may have unknown behavior.
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* @param {import('@twurple/auth').AuthProvider} auth_provider used to add the authentication header to requests for web storage
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* @param {fetch} fetch defaults to `globalThis.fetch`, allows you to further customize fetch behavior via chaining, for example with `fetch-retry`
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*/
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constructor(auth_provider: import('@twurple/auth').AuthProvider, fetch: typeof globalThis.fetch = globalThis.fetch, origin?: string) {
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this.#fetch = fetch
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this.#auth_provider = auth_provider
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auth_provider.getAccessTokenForUser(undefined)
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.then(token => caches.open(token.userId + '/' + auth_provider.clientId))
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.then(cache => this.#cache = cache)
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if (origin) this.#origin = origin
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}
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/**
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*
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* @param {String | URL} resource
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* @param {RequestInit} options
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*/
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async fetch(resource: string | URL, options: RequestInit={}) {
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resource = new URL(resource, this.#origin)
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if (resource.origin == this.#origin) {
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const token = await this.#auth_provider.getAccessTokenForUser(undefined)
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if (!options.headers) {
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options.headers = {}
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}
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options.headers['authorization'] = 'OAuth ' + token.accessToken
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}
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if ('method' in options) {
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switch (options.method) {
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case 'PUT':
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case 'POST': {
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const response = await this.#fetch(resource, options)
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if (!response.ok) {
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return response
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}
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const blob = await new Request(resource, options).blob()
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this.#cache.put(resource, new Response(blob))
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return response
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}
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case 'DELETE': {
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const response = await this.#fetch(resource, options)
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if (!response.ok) {
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return response
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}
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this.#cache.delete(resource)
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return response
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}
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}
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}
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return this.#fetch(resource, options)
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.then(async response => {
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if (response.status >= 500) {
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throw new Error(response.statusText + '\n' + await response.text())
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}
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this.#cache.put(resource, response.clone())
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return response
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}).catch(error => {
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console.warn(error)
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return this.#cache.match(resource)
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}
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)
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}
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} |