mirror of https://github.com/denoland/deno.git
477 lines
14 KiB
TypeScript
477 lines
14 KiB
TypeScript
// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
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import {
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assert,
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createResolvable,
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notImplemented,
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isTypedArray
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} from "./util.ts";
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import * as domTypes from "./dom_types.ts";
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import { TextDecoder, TextEncoder } from "./text_encoding.ts";
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import { DenoBlob, bytesSymbol as blobBytesSymbol } from "./blob.ts";
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import { Headers } from "./headers.ts";
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import * as io from "./io.ts";
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import { read, close } from "./files.ts";
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import { Buffer } from "./buffer.ts";
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import { FormData } from "./form_data.ts";
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import { URLSearchParams } from "./url_search_params.ts";
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import * as dispatch from "./dispatch.ts";
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import { sendAsync } from "./dispatch_json.ts";
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function getHeaderValueParams(value: string): Map<string, string> {
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const params = new Map();
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// Forced to do so for some Map constructor param mismatch
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value
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.split(";")
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.slice(1)
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.map((s): string[] => s.trim().split("="))
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.filter((arr): boolean => arr.length > 1)
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.map(([k, v]): [string, string] => [k, v.replace(/^"([^"]*)"$/, "$1")])
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.forEach(([k, v]): Map<string, string> => params.set(k, v));
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return params;
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}
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function hasHeaderValueOf(s: string, value: string): boolean {
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return new RegExp(`^${value}[\t\s]*;?`).test(s);
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}
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class Body implements domTypes.Body, domTypes.ReadableStream, io.ReadCloser {
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private _bodyUsed = false;
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private _bodyPromise: null | Promise<ArrayBuffer> = null;
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private _data: ArrayBuffer | null = null;
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readonly locked: boolean = false; // TODO
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readonly body: null | Body = this;
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constructor(private rid: number, readonly contentType: string) {}
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private async _bodyBuffer(): Promise<ArrayBuffer> {
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assert(this._bodyPromise == null);
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const buf = new Buffer();
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try {
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const nread = await buf.readFrom(this);
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const ui8 = buf.bytes();
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assert(ui8.byteLength === nread);
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this._data = ui8.buffer.slice(
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ui8.byteOffset,
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ui8.byteOffset + nread
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) as ArrayBuffer;
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assert(this._data.byteLength === nread);
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} finally {
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this.close();
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}
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return this._data;
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}
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async arrayBuffer(): Promise<ArrayBuffer> {
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// If we've already bufferred the response, just return it.
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if (this._data != null) {
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return this._data;
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}
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// If there is no _bodyPromise yet, start it.
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if (this._bodyPromise == null) {
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this._bodyPromise = this._bodyBuffer();
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}
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return this._bodyPromise;
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}
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async blob(): Promise<domTypes.Blob> {
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const arrayBuffer = await this.arrayBuffer();
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return new DenoBlob([arrayBuffer], {
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type: this.contentType
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});
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}
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// ref: https://fetch.spec.whatwg.org/#body-mixin
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async formData(): Promise<domTypes.FormData> {
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const formData = new FormData();
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const enc = new TextEncoder();
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if (hasHeaderValueOf(this.contentType, "multipart/form-data")) {
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const params = getHeaderValueParams(this.contentType);
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if (!params.has("boundary")) {
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// TypeError is required by spec
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throw new TypeError("multipart/form-data must provide a boundary");
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}
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// ref: https://tools.ietf.org/html/rfc2046#section-5.1
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const boundary = params.get("boundary")!;
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const dashBoundary = `--${boundary}`;
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const delimiter = `\r\n${dashBoundary}`;
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const closeDelimiter = `${delimiter}--`;
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const body = await this.text();
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let bodyParts: string[];
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const bodyEpilogueSplit = body.split(closeDelimiter);
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if (bodyEpilogueSplit.length < 2) {
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bodyParts = [];
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} else {
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// discard epilogue
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const bodyEpilogueTrimmed = bodyEpilogueSplit[0];
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// first boundary treated special due to optional prefixed \r\n
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const firstBoundaryIndex = bodyEpilogueTrimmed.indexOf(dashBoundary);
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if (firstBoundaryIndex < 0) {
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throw new TypeError("Invalid boundary");
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}
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const bodyPreambleTrimmed = bodyEpilogueTrimmed
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.slice(firstBoundaryIndex + dashBoundary.length)
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.replace(/^[\s\r\n\t]+/, ""); // remove transport-padding CRLF
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// trimStart might not be available
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// Be careful! body-part allows trailing \r\n!
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// (as long as it is not part of `delimiter`)
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bodyParts = bodyPreambleTrimmed
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.split(delimiter)
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.map((s): string => s.replace(/^[\s\r\n\t]+/, ""));
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// TODO: LWSP definition is actually trickier,
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// but should be fine in our case since without headers
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// we should just discard the part
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}
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for (const bodyPart of bodyParts) {
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const headers = new Headers();
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const headerOctetSeperatorIndex = bodyPart.indexOf("\r\n\r\n");
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if (headerOctetSeperatorIndex < 0) {
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continue; // Skip unknown part
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}
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const headerText = bodyPart.slice(0, headerOctetSeperatorIndex);
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const octets = bodyPart.slice(headerOctetSeperatorIndex + 4);
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// TODO: use textproto.readMIMEHeader from deno_std
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const rawHeaders = headerText.split("\r\n");
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for (const rawHeader of rawHeaders) {
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const sepIndex = rawHeader.indexOf(":");
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if (sepIndex < 0) {
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continue; // Skip this header
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}
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const key = rawHeader.slice(0, sepIndex);
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const value = rawHeader.slice(sepIndex + 1);
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headers.set(key, value);
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}
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if (!headers.has("content-disposition")) {
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continue; // Skip unknown part
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}
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// Content-Transfer-Encoding Deprecated
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const contentDisposition = headers.get("content-disposition")!;
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const partContentType = headers.get("content-type") || "text/plain";
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// TODO: custom charset encoding (needs TextEncoder support)
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// const contentTypeCharset =
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// getHeaderValueParams(partContentType).get("charset") || "";
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if (!hasHeaderValueOf(contentDisposition, "form-data")) {
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continue; // Skip, might not be form-data
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}
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const dispositionParams = getHeaderValueParams(contentDisposition);
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if (!dispositionParams.has("name")) {
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continue; // Skip, unknown name
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}
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const dispositionName = dispositionParams.get("name")!;
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if (dispositionParams.has("filename")) {
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const filename = dispositionParams.get("filename")!;
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const blob = new DenoBlob([enc.encode(octets)], {
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type: partContentType
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});
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// TODO: based on spec
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// https://xhr.spec.whatwg.org/#dom-formdata-append
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// https://xhr.spec.whatwg.org/#create-an-entry
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// Currently it does not mention how I could pass content-type
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// to the internally created file object...
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formData.append(dispositionName, blob, filename);
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} else {
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formData.append(dispositionName, octets);
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}
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}
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return formData;
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} else if (
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hasHeaderValueOf(this.contentType, "application/x-www-form-urlencoded")
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) {
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// From https://github.com/github/fetch/blob/master/fetch.js
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// Copyright (c) 2014-2016 GitHub, Inc. MIT License
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const body = await this.text();
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try {
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body
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.trim()
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.split("&")
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.forEach((bytes): void => {
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if (bytes) {
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const split = bytes.split("=");
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const name = split.shift()!.replace(/\+/g, " ");
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const value = split.join("=").replace(/\+/g, " ");
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formData.append(
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decodeURIComponent(name),
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decodeURIComponent(value)
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);
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}
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});
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} catch (e) {
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throw new TypeError("Invalid form urlencoded format");
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}
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return formData;
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} else {
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throw new TypeError("Invalid form data");
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}
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}
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// eslint-disable-next-line @typescript-eslint/no-explicit-any
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async json(): Promise<any> {
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const text = await this.text();
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return JSON.parse(text);
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}
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async text(): Promise<string> {
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const ab = await this.arrayBuffer();
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const decoder = new TextDecoder("utf-8");
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return decoder.decode(ab);
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}
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read(p: Uint8Array): Promise<number | io.EOF> {
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this._bodyUsed = true;
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return read(this.rid, p);
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}
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close(): void {
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close(this.rid);
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}
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async cancel(): Promise<void> {
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return notImplemented();
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}
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getReader(): domTypes.ReadableStreamReader {
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return notImplemented();
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}
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tee(): [domTypes.ReadableStream, domTypes.ReadableStream] {
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return notImplemented();
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}
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[Symbol.asyncIterator](): AsyncIterableIterator<Uint8Array> {
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return io.toAsyncIterator(this);
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}
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get bodyUsed(): boolean {
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return this._bodyUsed;
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}
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}
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export class Response implements domTypes.Response {
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readonly type = "basic"; // TODO
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readonly redirected: boolean;
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headers: domTypes.Headers;
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readonly trailer: Promise<domTypes.Headers>;
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readonly body: Body;
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constructor(
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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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headersList: Array<[string, string]>,
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rid: number,
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redirected_: boolean,
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body_: null | Body = null
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) {
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this.trailer = createResolvable();
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this.headers = new Headers(headersList);
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const contentType = this.headers.get("content-type") || "";
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if (body_ == null) {
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this.body = new Body(rid, contentType);
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} else {
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this.body = body_;
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}
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this.redirected = redirected_;
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}
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async arrayBuffer(): Promise<ArrayBuffer> {
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return this.body.arrayBuffer();
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}
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async blob(): Promise<domTypes.Blob> {
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return this.body.blob();
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}
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async formData(): Promise<domTypes.FormData> {
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return this.body.formData();
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}
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// eslint-disable-next-line @typescript-eslint/no-explicit-any
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async json(): Promise<any> {
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return this.body.json();
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}
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async text(): Promise<string> {
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return this.body.text();
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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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get bodyUsed(): boolean {
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return this.body.bodyUsed;
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}
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clone(): domTypes.Response {
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if (this.bodyUsed) {
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throw new TypeError(
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"Failed to execute 'clone' on 'Response': Response body is already used"
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);
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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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return new Response(
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this.url,
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this.status,
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this.statusText,
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headersList,
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-1,
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this.redirected,
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this.body
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);
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}
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}
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interface FetchResponse {
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bodyRid: number;
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status: number;
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statusText: string;
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headers: Array<[string, string]>;
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}
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async function sendFetchReq(
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url: string,
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method: string | null,
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headers: domTypes.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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let zeroCopy = undefined;
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if (body) {
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zeroCopy = new Uint8Array(body.buffer, body.byteOffset, body.byteLength);
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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 (await sendAsync(dispatch.OP_FETCH, args, zeroCopy)) as FetchResponse;
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}
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/** Fetch a resource from the network. */
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export async function fetch(
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input: domTypes.Request | 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: domTypes.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") {
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url = input;
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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 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 {
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// TODO: FormData, 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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//@ts-ignore
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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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while (remRedirectCount) {
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const fetchResponse = await sendFetchReq(url, method, headers, body);
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const response = new Response(
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url,
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fetchResponse.status,
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fetchResponse.statusText,
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fetchResponse.headers,
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fetchResponse.bodyRid,
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redirected
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);
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if ([301, 302, 303, 307, 308].includes(response.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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throw notImplemented();
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case "manual":
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throw notImplemented();
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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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// Return a network error due to too many redirections
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throw notImplemented();
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}
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