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Global request / response #2253

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merged 2 commits into from May 2, 2019
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Just for now

@@ -50,6 +50,7 @@ if (is_posix) {
ts_sources = [
"../js/assets.ts",
"../js/blob.ts",
"../js/body.ts",
"../js/buffer.ts",
"../js/build.ts",
"../js/chmod.ts",
@@ -96,6 +97,7 @@ ts_sources = [
"../js/remove.ts",
"../js/rename.ts",
"../js/repl.ts",
"../js/request.ts",
"../js/resources.ts",
"../js/stat.ts",
"../js/symlink.ts",
@@ -0,0 +1,348 @@
import * as streams from "@stardazed/streams";
import * as formData from "./form_data";
import * as blob from "./blob";
import * as encoding from "./text_encoding";
import * as headers from "./headers";

import * as domTypes from "./dom_types";

const { Headers } = headers;

// only namespace imports work for now, plucking out what we need
const { ReadableStream } = streams;
const { FormData } = formData;
const { TextEncoder, TextDecoder } = encoding;
const Blob = blob.DenoBlob;
const DenoBlob = blob.DenoBlob;

type ReadableStreamReader = domTypes.ReadableStreamReader;

interface ReadableStreamController {
enqueue(chunk: string | ArrayBuffer): void;
close(): void;
}

export type BodySource =
| domTypes.Blob
| domTypes.BufferSource
| domTypes.FormData
| domTypes.URLSearchParams
| domTypes.ReadableStream
| string;

function validateBodyType(owner: Body, bodySource: BodySource): boolean {
if (
bodySource instanceof Int8Array ||
bodySource instanceof Int16Array ||
bodySource instanceof Int32Array ||
bodySource instanceof Uint8Array ||
bodySource instanceof Uint16Array ||
bodySource instanceof Uint32Array ||
bodySource instanceof Uint8ClampedArray ||
bodySource instanceof Float32Array ||
bodySource instanceof Float64Array
) {
return true;
} else if (bodySource instanceof ArrayBuffer) {
return true;
} else if (typeof bodySource === "string") {
return true;
} else if (bodySource instanceof ReadableStream) {
return true;
} else if (bodySource instanceof FormData) {
return true;
} else if (!bodySource) {
return true; // null body is fine
}
throw new Error(
`Bad ${owner.constructor.name} body type: ${bodySource.constructor.name}`
);
}

function concatenate(...arrays: Uint8Array[]): ArrayBuffer {
let totalLength = 0;
for (const arr of arrays) {
totalLength += arr.length;
}
const result = new Uint8Array(totalLength);
let offset = 0;
for (const arr of arrays) {
result.set(arr, offset);
offset += arr.length;
}
return result.buffer as ArrayBuffer;
}

function bufferFromStream(stream: ReadableStreamReader): Promise<ArrayBuffer> {
return new Promise(
(resolve, reject): void => {
const parts: Uint8Array[] = [];
const encoder = new TextEncoder();
// recurse
(function pump(): void {
stream
.read()
.then(
({ done, value }): void => {
if (done) {
return resolve(concatenate(...parts));
}

if (typeof value === "string") {
parts.push(encoder.encode(value));
} else if (value instanceof ArrayBuffer) {
parts.push(new Uint8Array(value));
} else if (!value) {
// noop for undefined
} else {
reject("unhandled type on stream read");
}

return pump();
}
)
.catch(
(err): void => {
reject(err);
}
);
})();
}
);
}

function getHeaderValueParams(value: string): Map<string, string> {
const params = new Map();
// Forced to do so for some Map constructor param mismatch
value
.split(";")
.slice(1)
.map((s): string[] => s.trim().split("="))
.filter((arr): boolean => arr.length > 1)
.map(([k, v]): [string, string] => [k, v.replace(/^"([^"]*)"$/, "$1")])
.forEach(([k, v]): Map<string, string> => params.set(k, v));
return params;
}

function hasHeaderValueOf(s: string, value: string): boolean {
return new RegExp(`^${value}[\t\s]*;?`).test(s);
}

export const BodyUsedError =
"Failed to execute 'clone' on 'Body': body is already used";

export class Body implements domTypes.Body {
protected _stream: domTypes.ReadableStream | null;

constructor(protected _bodySource: BodySource, readonly contentType: string) {
validateBodyType(this, _bodySource);
this._bodySource = _bodySource;
this.contentType = contentType;
this._stream = null;
}

get body(): domTypes.ReadableStream | null {
if (this._stream) {
return this._stream;
}
if (this._bodySource instanceof ReadableStream) {
// @ts-ignore
this._stream = this._bodySource;
}
if (typeof this._bodySource === "string") {
this._stream = new ReadableStream({
start(controller: ReadableStreamController): void {
controller.enqueue(this._bodySource);
controller.close();
}
});
}
return this._stream;
}

get bodyUsed(): boolean {
if (this.body && this.body.locked) {
return true;
}
return false;
}

public async blob(): Promise<domTypes.Blob> {
return new Blob([await this.arrayBuffer()]);
}

// ref: https://fetch.spec.whatwg.org/#body-mixin
public async formData(): Promise<domTypes.FormData> {
const formData = new FormData();
const enc = new TextEncoder();
if (hasHeaderValueOf(this.contentType, "multipart/form-data")) {
const params = getHeaderValueParams(this.contentType);
if (!params.has("boundary")) {
// TypeError is required by spec
throw new TypeError("multipart/form-data must provide a boundary");
}
// ref: https://tools.ietf.org/html/rfc2046#section-5.1
const boundary = params.get("boundary")!;
const dashBoundary = `--${boundary}`;
const delimiter = `\r\n${dashBoundary}`;
const closeDelimiter = `${delimiter}--`;

const body = await this.text();
let bodyParts: string[];
const bodyEpilogueSplit = body.split(closeDelimiter);
if (bodyEpilogueSplit.length < 2) {
bodyParts = [];
} else {
// discard epilogue
const bodyEpilogueTrimmed = bodyEpilogueSplit[0];
// first boundary treated special due to optional prefixed \r\n
const firstBoundaryIndex = bodyEpilogueTrimmed.indexOf(dashBoundary);
if (firstBoundaryIndex < 0) {
throw new TypeError("Invalid boundary");
}
const bodyPreambleTrimmed = bodyEpilogueTrimmed
.slice(firstBoundaryIndex + dashBoundary.length)
.replace(/^[\s\r\n\t]+/, ""); // remove transport-padding CRLF
// trimStart might not be available
// Be careful! body-part allows trailing \r\n!
// (as long as it is not part of `delimiter`)
bodyParts = bodyPreambleTrimmed
.split(delimiter)
.map((s): string => s.replace(/^[\s\r\n\t]+/, ""));
// TODO: LWSP definition is actually trickier,
// but should be fine in our case since without headers
// we should just discard the part
}
for (const bodyPart of bodyParts) {
const headers = new Headers();
const headerOctetSeperatorIndex = bodyPart.indexOf("\r\n\r\n");
if (headerOctetSeperatorIndex < 0) {
continue; // Skip unknown part
}
const headerText = bodyPart.slice(0, headerOctetSeperatorIndex);
const octets = bodyPart.slice(headerOctetSeperatorIndex + 4);

// TODO: use textproto.readMIMEHeader from deno_std
const rawHeaders = headerText.split("\r\n");
for (const rawHeader of rawHeaders) {
const sepIndex = rawHeader.indexOf(":");
if (sepIndex < 0) {
continue; // Skip this header
}
const key = rawHeader.slice(0, sepIndex);
const value = rawHeader.slice(sepIndex + 1);
headers.set(key, value);
}
if (!headers.has("content-disposition")) {
continue; // Skip unknown part
}
// Content-Transfer-Encoding Deprecated
const contentDisposition = headers.get("content-disposition")!;
const partContentType = headers.get("content-type") || "text/plain";
// TODO: custom charset encoding (needs TextEncoder support)
// const contentTypeCharset =
// getHeaderValueParams(partContentType).get("charset") || "";
if (!hasHeaderValueOf(contentDisposition, "form-data")) {
continue; // Skip, might not be form-data
}
const dispositionParams = getHeaderValueParams(contentDisposition);
if (!dispositionParams.has("name")) {
continue; // Skip, unknown name
}
const dispositionName = dispositionParams.get("name")!;
if (dispositionParams.has("filename")) {
const filename = dispositionParams.get("filename")!;
const blob = new DenoBlob([enc.encode(octets)], {
type: partContentType
});
// TODO: based on spec
// https://xhr.spec.whatwg.org/#dom-formdata-append
// https://xhr.spec.whatwg.org/#create-an-entry
// Currently it does not mention how I could pass content-type
// to the internally created file object...
formData.append(dispositionName, blob, filename);
} else {
formData.append(dispositionName, octets);
}
}
return formData;
} else if (
hasHeaderValueOf(this.contentType, "application/x-www-form-urlencoded")
) {
// From https://github.com/github/fetch/blob/master/fetch.js
// Copyright (c) 2014-2016 GitHub, Inc. MIT License
const body = await this.text();
try {
body
.trim()
.split("&")
.forEach(
(bytes): void => {
if (bytes) {
const split = bytes.split("=");
const name = split.shift()!.replace(/\+/g, " ");
const value = split.join("=").replace(/\+/g, " ");
formData.append(
decodeURIComponent(name),
decodeURIComponent(value)
);
}
}
);
} catch (e) {
throw new TypeError("Invalid form urlencoded format");
}
return formData;
} else {
throw new TypeError("Invalid form data");
}
}

public async text(): Promise<string> {
if (typeof this._bodySource === "string") {
return this._bodySource;
}

const ab = await this.arrayBuffer();
const decoder = new TextDecoder("utf-8");
return decoder.decode(ab);
}

// eslint-disable-next-line @typescript-eslint/no-explicit-any
public async json(): Promise<any> {
const raw = await this.text();
return JSON.parse(raw);
}

public async arrayBuffer(): Promise<ArrayBuffer> {
if (
this._bodySource instanceof Int8Array ||
this._bodySource instanceof Int16Array ||
this._bodySource instanceof Int32Array ||
this._bodySource instanceof Uint8Array ||
this._bodySource instanceof Uint16Array ||
this._bodySource instanceof Uint32Array ||
this._bodySource instanceof Uint8ClampedArray ||
this._bodySource instanceof Float32Array ||
this._bodySource instanceof Float64Array
) {
return this._bodySource.buffer as ArrayBuffer;
} else if (this._bodySource instanceof ArrayBuffer) {
return this._bodySource;
} else if (typeof this._bodySource === "string") {
const enc = new TextEncoder();
return enc.encode(this._bodySource).buffer as ArrayBuffer;
} else if (this._bodySource instanceof ReadableStream) {
// @ts-ignore
return bufferFromStream(this._bodySource.getReader());
} else if (this._bodySource instanceof FormData) {
const enc = new TextEncoder();
return enc.encode(this._bodySource.toString()).buffer as ArrayBuffer;
} else if (!this._bodySource) {
return new ArrayBuffer(0);
}
throw new Error(
`Body type not yet implemented: ${this._bodySource.constructor.name}`
);
}
}
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