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365 lines
11 KiB
TypeScript
365 lines
11 KiB
TypeScript
// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
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import { notImplemented } from "../util.ts";
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import { isTypedArray } from "./util.ts";
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import * as domTypes from "./dom_types.d.ts";
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import { TextEncoder } from "./text_encoding.ts";
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import { DenoBlob, bytesSymbol as blobBytesSymbol } from "./blob.ts";
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import { read } from "../ops/io.ts";
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import { close } from "../ops/resources.ts";
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import { fetch as opFetch, FetchResponse } from "../ops/fetch.ts";
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import * as Body from "./body.ts";
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import { getHeaderValueParams } from "./util.ts";
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import { ReadableStreamImpl } from "./streams/readable_stream.ts";
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import { MultipartBuilder } from "./fetch/multipart.ts";
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const NULL_BODY_STATUS = [101, 204, 205, 304];
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const REDIRECT_STATUS = [301, 302, 303, 307, 308];
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const responseData = new WeakMap();
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export class Response extends Body.Body implements domTypes.Response {
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readonly type: ResponseType;
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readonly redirected: boolean;
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readonly url: string;
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readonly status: number;
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readonly statusText: string;
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headers: Headers;
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constructor(body: BodyInit | null = null, init?: domTypes.ResponseInit) {
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init = init ?? {};
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if (typeof init !== "object") {
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throw new TypeError(`'init' is not an object`);
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}
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const extraInit = responseData.get(init) || {};
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let { type = "default", url = "" } = extraInit;
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let status = init.status === undefined ? 200 : Number(init.status || 0);
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let statusText = init.statusText ?? "";
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let headers =
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init.headers instanceof Headers
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? init.headers
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: new Headers(init.headers);
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if (init.status !== undefined && (status < 200 || status > 599)) {
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throw new RangeError(
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`The status provided (${init.status}) is outside the range [200, 599]`
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);
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}
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// null body status
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if (body && NULL_BODY_STATUS.includes(status)) {
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throw new TypeError("Response with null body status cannot have body");
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}
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if (!type) {
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type = "default";
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} else {
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if (type == "error") {
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// spec: https://fetch.spec.whatwg.org/#concept-network-error
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status = 0;
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statusText = "";
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headers = new Headers();
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body = null;
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/* spec for other Response types:
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https://fetch.spec.whatwg.org/#concept-filtered-response-basic
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Please note that type "basic" is not the same thing as "default".*/
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} else if (type == "basic") {
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for (const h of headers) {
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/* Forbidden Response-Header Names:
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https://fetch.spec.whatwg.org/#forbidden-response-header-name */
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if (["set-cookie", "set-cookie2"].includes(h[0].toLowerCase())) {
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headers.delete(h[0]);
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}
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}
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} else if (type == "cors") {
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/* CORS-safelisted Response-Header Names:
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https://fetch.spec.whatwg.org/#cors-safelisted-response-header-name */
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const allowedHeaders = [
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"Cache-Control",
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"Content-Language",
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"Content-Length",
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"Content-Type",
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"Expires",
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"Last-Modified",
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"Pragma",
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].map((c: string) => c.toLowerCase());
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for (const h of headers) {
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/* Technically this is still not standards compliant because we are
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supposed to allow headers allowed in the
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'Access-Control-Expose-Headers' header in the 'internal response'
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However, this implementation of response doesn't seem to have an
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easy way to access the internal response, so we ignore that
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header.
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TODO(serverhiccups): change how internal responses are handled
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so we can do this properly. */
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if (!allowedHeaders.includes(h[0].toLowerCase())) {
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headers.delete(h[0]);
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}
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}
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/* TODO(serverhiccups): Once I fix the 'internal response' thing,
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these actually need to treat the internal response differently */
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} else if (type == "opaque" || type == "opaqueredirect") {
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url = "";
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status = 0;
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statusText = "";
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headers = new Headers();
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body = null;
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}
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}
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const contentType = headers.get("content-type") || "";
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super(body, contentType);
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this.url = url;
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this.statusText = statusText;
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this.status = extraInit.status || status;
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this.headers = headers;
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this.redirected = extraInit.redirected || false;
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this.type = type;
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}
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get ok(): boolean {
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return 200 <= this.status && this.status < 300;
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}
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public clone(): domTypes.Response {
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if (this.bodyUsed) {
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throw TypeError(Body.BodyUsedError);
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}
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const iterators = this.headers.entries();
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const headersList: Array<[string, string]> = [];
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for (const header of iterators) {
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headersList.push(header);
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}
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let resBody = this._bodySource;
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if (this._bodySource instanceof ReadableStreamImpl) {
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const tees = this._bodySource.tee();
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this._stream = this._bodySource = tees[0];
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resBody = tees[1];
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}
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return new Response(resBody, {
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status: this.status,
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statusText: this.statusText,
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headers: new Headers(headersList),
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});
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}
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static redirect(url: URL | string, status: number): domTypes.Response {
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if (![301, 302, 303, 307, 308].includes(status)) {
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throw new RangeError(
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"The redirection status must be one of 301, 302, 303, 307 and 308."
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);
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}
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return new Response(null, {
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status,
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statusText: "",
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headers: [["Location", typeof url === "string" ? url : url.toString()]],
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});
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}
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}
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function sendFetchReq(
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url: string,
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method: string | null,
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headers: Headers | null,
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body: ArrayBufferView | undefined
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): Promise<FetchResponse> {
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let headerArray: Array<[string, string]> = [];
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if (headers) {
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headerArray = Array.from(headers.entries());
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}
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const args = {
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method,
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url,
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headers: headerArray,
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};
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return opFetch(args, body);
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}
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export async function fetch(
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input: (domTypes.Request & { _bodySource?: unknown }) | URL | string,
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init?: domTypes.RequestInit
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): Promise<Response> {
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let url: string;
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let method: string | null = null;
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let headers: Headers | null = null;
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let body: ArrayBufferView | undefined;
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let redirected = false;
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let remRedirectCount = 20; // TODO: use a better way to handle
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if (typeof input === "string" || input instanceof URL) {
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url = typeof input === "string" ? (input as string) : (input as URL).href;
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if (init != null) {
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method = init.method || null;
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if (init.headers) {
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headers =
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init.headers instanceof Headers
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? init.headers
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: new Headers(init.headers);
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} else {
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headers = null;
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}
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// ref: https://fetch.spec.whatwg.org/#body-mixin
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// Body should have been a mixin
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// but we are treating it as a separate class
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if (init.body) {
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if (!headers) {
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headers = new Headers();
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}
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let contentType = "";
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if (typeof init.body === "string") {
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body = new TextEncoder().encode(init.body);
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contentType = "text/plain;charset=UTF-8";
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} else if (isTypedArray(init.body)) {
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body = init.body;
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} else if (init.body instanceof ArrayBuffer) {
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body = new Uint8Array(init.body);
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} else if (init.body instanceof URLSearchParams) {
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body = new TextEncoder().encode(init.body.toString());
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contentType = "application/x-www-form-urlencoded;charset=UTF-8";
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} else if (init.body instanceof DenoBlob) {
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body = init.body[blobBytesSymbol];
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contentType = init.body.type;
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} else if (init.body instanceof FormData) {
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let boundary;
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if (headers.has("content-type")) {
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const params = getHeaderValueParams("content-type");
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boundary = params.get("boundary")!;
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}
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const multipartBuilder = new MultipartBuilder(init.body, boundary);
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body = multipartBuilder.getBody();
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contentType = multipartBuilder.getContentType();
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} else {
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// TODO: ReadableStream
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notImplemented();
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}
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if (contentType && !headers.has("content-type")) {
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headers.set("content-type", contentType);
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}
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}
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}
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} else {
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url = input.url;
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method = input.method;
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headers = input.headers;
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if (input._bodySource) {
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body = new DataView(await input.arrayBuffer());
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}
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}
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let responseBody;
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let responseInit: domTypes.ResponseInit = {};
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while (remRedirectCount) {
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const fetchResponse = await sendFetchReq(url, method, headers, body);
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if (
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NULL_BODY_STATUS.includes(fetchResponse.status) ||
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REDIRECT_STATUS.includes(fetchResponse.status)
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) {
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// We won't use body of received response, so close it now
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// otherwise it will be kept in resource table.
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close(fetchResponse.bodyRid);
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responseBody = null;
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} else {
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responseBody = new ReadableStreamImpl({
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async pull(controller: ReadableStreamDefaultController): Promise<void> {
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try {
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const b = new Uint8Array(1024 * 32);
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const result = await read(fetchResponse.bodyRid, b);
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if (result === null) {
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controller.close();
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return close(fetchResponse.bodyRid);
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}
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controller.enqueue(b.subarray(0, result));
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} catch (e) {
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controller.error(e);
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controller.close();
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close(fetchResponse.bodyRid);
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}
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},
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cancel(): void {
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// When reader.cancel() is called
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close(fetchResponse.bodyRid);
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},
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});
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}
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responseInit = {
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status: 200,
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statusText: fetchResponse.statusText,
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headers: fetchResponse.headers,
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};
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responseData.set(responseInit, {
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redirected,
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rid: fetchResponse.bodyRid,
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status: fetchResponse.status,
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url,
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});
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const response = new Response(responseBody, responseInit);
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if (REDIRECT_STATUS.includes(fetchResponse.status)) {
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// We're in a redirect status
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switch ((init && init.redirect) || "follow") {
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case "error":
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responseInit = {};
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responseData.set(responseInit, {
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type: "error",
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redirected: false,
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url: "",
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});
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return new Response(null, responseInit);
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case "manual":
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responseInit = {};
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responseData.set(responseInit, {
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type: "opaqueredirect",
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redirected: false,
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url: "",
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});
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return new Response(null, responseInit);
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case "follow":
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default:
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let redirectUrl = response.headers.get("Location");
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if (redirectUrl == null) {
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return response; // Unspecified
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}
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if (
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!redirectUrl.startsWith("http://") &&
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!redirectUrl.startsWith("https://")
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) {
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redirectUrl =
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url.split("//")[0] +
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"//" +
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url.split("//")[1].split("/")[0] +
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redirectUrl; // TODO: handle relative redirection more gracefully
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}
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url = redirectUrl;
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redirected = true;
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remRedirectCount--;
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}
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} else {
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return response;
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}
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}
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responseData.set(responseInit, {
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type: "error",
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redirected: false,
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url: "",
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});
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return new Response(null, responseInit);
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}
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