mirror of
https://github.com/denoland/deno.git
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431 lines
14 KiB
TypeScript
431 lines
14 KiB
TypeScript
// Copyright 2018 the Deno authors. All rights reserved. MIT license.
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import { assert, createResolvable, notImplemented, isTypedArray } from "./util";
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import * as flatbuffers from "./flatbuffers";
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import { sendAsync } from "./dispatch";
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import * as msg from "gen/msg_generated";
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import * as domTypes from "./dom_types";
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import { TextDecoder, TextEncoder } from "./text_encoding";
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import { DenoBlob, bytesSymbol as blobBytesSymbol } from "./blob";
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import { Headers } from "./headers";
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import * as io from "./io";
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import { read, close } from "./files";
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import { Buffer } from "./buffer";
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import { FormData } from "./form_data";
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import { URLSearchParams } from "./url_search_params";
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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 => s.trim().split("="))
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.filter(arr => arr.length > 1)
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.map(([k, v]) => [k, v.replace(/^"([^"]*)"$/, "$1")])
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.forEach(([k, v]) => params.set(k, v));
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return params;
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}
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function hasHeaderValueOf(s: string, value: string) {
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return new RegExp(`^${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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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 => 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 => {
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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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// tslint:disable-next-line:no-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<io.ReadResult> {
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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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}
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class Response implements domTypes.Response {
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readonly url: string = "";
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statusText = "FIXME"; // TODO
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readonly type = "basic"; // TODO
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redirected = false; // TODO
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headers: domTypes.Headers;
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readonly trailer: Promise<domTypes.Headers>;
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bodyUsed = false;
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readonly body: Body;
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constructor(
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readonly status: number,
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headersList: Array<[string, string]>,
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rid: number,
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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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}
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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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// tslint:disable-next-line:no-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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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(this.status, headersList, -1, this.body);
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}
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}
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function msgHttpRequest(
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builder: flatbuffers.Builder,
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url: string,
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method: null | string,
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headers: null | domTypes.Headers
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): flatbuffers.Offset {
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const methodOffset = !method ? -1 : builder.createString(method);
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let fieldsOffset: flatbuffers.Offset = -1;
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const urlOffset = builder.createString(url);
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if (headers) {
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const kvOffsets: flatbuffers.Offset[] = [];
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for (const [key, val] of headers.entries()) {
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const keyOffset = builder.createString(key);
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const valOffset = builder.createString(val);
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msg.KeyValue.startKeyValue(builder);
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msg.KeyValue.addKey(builder, keyOffset);
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msg.KeyValue.addValue(builder, valOffset);
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kvOffsets.push(msg.KeyValue.endKeyValue(builder));
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}
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fieldsOffset = msg.HttpHeader.createFieldsVector(builder, kvOffsets);
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} else {
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}
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msg.HttpHeader.startHttpHeader(builder);
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msg.HttpHeader.addIsRequest(builder, true);
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msg.HttpHeader.addUrl(builder, urlOffset);
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if (methodOffset >= 0) {
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msg.HttpHeader.addMethod(builder, methodOffset);
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}
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if (fieldsOffset >= 0) {
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msg.HttpHeader.addFields(builder, fieldsOffset);
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}
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return msg.HttpHeader.endHttpHeader(builder);
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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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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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}
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// Send Fetch message
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const builder = flatbuffers.createBuilder();
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const headerOff = msgHttpRequest(builder, url, method, headers);
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msg.Fetch.startFetch(builder);
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msg.Fetch.addHeader(builder, headerOff);
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const resBase = await sendAsync(
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builder,
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msg.Any.Fetch,
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msg.Fetch.endFetch(builder),
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body
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);
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// Decode FetchRes
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assert(msg.Any.FetchRes === resBase.innerType());
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const inner = new msg.FetchRes();
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assert(resBase.inner(inner) != null);
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const header = inner.header()!;
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const bodyRid = inner.bodyRid();
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assert(!header.isRequest());
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const status = header.status();
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const headersList = deserializeHeaderFields(header);
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const response = new Response(status, headersList, bodyRid);
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return response;
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}
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function deserializeHeaderFields(m: msg.HttpHeader): Array<[string, string]> {
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const out: Array<[string, string]> = [];
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for (let i = 0; i < m.fieldsLength(); i++) {
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const item = m.fields(i)!;
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out.push([item.key()!, item.value()!]);
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}
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return out;
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}
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