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import * as blob from "./blob.ts";
import * as encoding from "./text_encoding.ts";
import * as domTypes from "./dom_types.d.ts";
import { ReadableStreamImpl } from "./streams/readable_stream.ts";
import { isReadableStreamDisturbed } from "./streams/internals.ts";
import { getHeaderValueParams, hasHeaderValueOf } from "./util.ts";
import { MultipartParser } from "./fetch/multipart.ts";
// only namespace imports work for now, plucking out what we need
const { TextEncoder, TextDecoder } = encoding;
const DenoBlob = blob.DenoBlob;
function validateBodyType(owner: Body, bodySource: BodyInit | null): 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 ReadableStreamImpl) {
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;
}
async function bufferFromStream(
stream: ReadableStreamReader
): Promise<ArrayBuffer> {
const parts: Uint8Array[] = [];
const encoder = new TextEncoder();
while (true) {
const { done, value } = await stream.read();
if (done) break;
if (typeof value === "string") {
parts.push(encoder.encode(value));
} else if (value instanceof ArrayBuffer) {
parts.push(new Uint8Array(value));
} else if (value instanceof Uint8Array) {
parts.push(value);
} else if (!value) {
// noop for undefined
} else {
throw new Error("unhandled type on stream read");
}
}
return concatenate(...parts);
}
export const BodyUsedError =
"Failed to execute 'clone' on 'Body': body is already used";
export class Body implements domTypes.Body {
protected _stream: ReadableStreamImpl<string | ArrayBuffer> | null;
constructor(
protected _bodySource: BodyInit | null,
readonly contentType: string
) {
validateBodyType(this, _bodySource);
this._bodySource = _bodySource;
this.contentType = contentType;
this._stream = null;
}
get body(): ReadableStream | null {
if (this._stream) {
return this._stream;
}
if (this._bodySource instanceof ReadableStreamImpl) {
this._stream = this._bodySource;
}
if (typeof this._bodySource === "string") {
const bodySource = this._bodySource;
this._stream = new ReadableStreamImpl<string | ArrayBuffer>({
start(controller: ReadableStreamDefaultController): void {
controller.enqueue(bodySource);
controller.close();
},
});
}
return this._stream;
}
get bodyUsed(): boolean {
if (this.body && isReadableStreamDisturbed(this.body)) {
return true;
}
return false;
}
public async blob(): Promise<Blob> {
return new DenoBlob([await this.arrayBuffer()], {
type: this.contentType,
});
}
// ref: https://fetch.spec.whatwg.org/#body-mixin
public async formData(): Promise<FormData> {
const formData = new FormData();
if (hasHeaderValueOf(this.contentType, "multipart/form-data")) {
const params = getHeaderValueParams(this.contentType);
// ref: https://tools.ietf.org/html/rfc2046#section-5.1
const boundary = params.get("boundary")!;
const body = new Uint8Array(await this.arrayBuffer());
const multipartParser = new MultipartParser(body, boundary);
return multipartParser.parse();
} 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 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 Promise.resolve(this._bodySource.buffer as ArrayBuffer);
} else if (this._bodySource instanceof ArrayBuffer) {
return Promise.resolve(this._bodySource);
} else if (typeof this._bodySource === "string") {
const enc = new TextEncoder();
return Promise.resolve(
enc.encode(this._bodySource).buffer as ArrayBuffer
);
} else if (this._bodySource instanceof ReadableStreamImpl) {
return bufferFromStream(this._bodySource.getReader());
} else if (this._bodySource instanceof FormData) {
const enc = new TextEncoder();
return Promise.resolve(
enc.encode(this._bodySource.toString()).buffer as ArrayBuffer
);
} else if (!this._bodySource) {
return Promise.resolve(new ArrayBuffer(0));
}
throw new Error(
`Body type not yet implemented: ${this._bodySource.constructor.name}`
);
}
}
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