From 9422491a446c419e0544d3752bcb2ac8be463d07 Mon Sep 17 00:00:00 2001 From: SukantGujar Date: Fri, 8 Mar 2019 18:43:22 +0530 Subject: [PATCH] Add first draft (untested). --- .gitignore | 6 +- .vscode/settings.json | 4 +- package.json | 5 +- src/index.ts | 105 ++++++++++- src/parseRangeHeader.ts | 57 ++++++ tsconfig.json | 32 ++-- yarn.lock | 393 +++++++++++++++++++++++++++++++++++++++- 7 files changed, 575 insertions(+), 27 deletions(-) create mode 100644 src/parseRangeHeader.ts diff --git a/.gitignore b/.gitignore index 18944dc34..d653d607b 100644 --- a/.gitignore +++ b/.gitignore @@ -1,4 +1,4 @@ -*.log -.env -node_modules +*.log +.env +node_modules dist \ No newline at end of file diff --git a/.vscode/settings.json b/.vscode/settings.json index cac0e10e6..4b3fe879b 100644 --- a/.vscode/settings.json +++ b/.vscode/settings.json @@ -1,3 +1,3 @@ -{ - "editor.formatOnSave": true +{ + "editor.formatOnSave": true } \ No newline at end of file diff --git a/package.json b/package.json index 82515849a..9736544fe 100644 --- a/package.json +++ b/package.json @@ -9,7 +9,10 @@ "build-watch": "npx tsc -w" }, "devDependencies": { - "@types/node": "^11.10.5", + "@types/express": "^4.16.1", "typescript": "^3.3.3333" + }, + "peerDependencies": { + "express": "^4.16.4" } } diff --git a/src/index.ts b/src/index.ts index d9a8b89f6..4e7450b24 100644 --- a/src/index.ts +++ b/src/index.ts @@ -1,2 +1,103 @@ -import { Request } from "node"; -export function handler(req: Request) {} +import { Request, Response } from "express"; +import { parseRangeHeader, RangeParserError, Range } from "./parseRangeHeader"; +import { Stream } from "stream"; + +/** + * @type {function (Request): Promise} + */ +export type ContentProvider = (req: Request) => Promise; + +export class ContentDoesNotExistError extends Error {} + +export interface Logger { + debug(message: string, extra?: any): void; +} + +export type Content = { + /** + * Returns a readable stream based on the provided range (optional). + * @param {Range} range The start-end range of stream data. + * @returns {Stream} A readable stream + */ + getStream(range?: Range): Stream; + /** + * Total size of the content + */ + readonly totalSize: number; + /** + * Mime type to be sent in Content-Type header + */ + readonly mimeType: string; + /** + * File name to be sent in Content-Disposition header + */ + readonly fileName: string; +}; + +const getHeader = (name: string, req: Request) => req.headers[name]; +const getRangeHeader = getHeader.bind(null, "range"); +const setHeader = (name: string, value: string, res: Response) => res.setHeader(name, value); +const setContentTypeHeader = setHeader.bind(null, "Content-Type"); +const setContentLengthHeader = setHeader.bind(null, "Content-Length"); +const setAcceptRangesHeader = setHeader.bind(null, "Accept-Ranges", "bytes"); +const setContentRangeHeader = (range: Range | null, size: number, res: Response) => + setHeader("Content-Range", `bytes ${range ? `${range.start}-${range.end}` : "*"}/${size}`, res); +const setContentDispositionHeader = (fileName: string, res: Response) => + setHeader("Content-Disposition", `attachment; filename="${fileName}"`, res); +const setCacheControlHeaderNoCache = setHeader.bind(null, "Cache-Control", "no-cache"); + +export function create(contentProvider: ContentProvider, logger: Logger) { + return async function handler(req: Request, res: Response) { + let content; + try { + content = await contentProvider(req); + } catch (error) { + logger.debug("ContentProvider threw exception: ", error); + if (error instanceof ContentDoesNotExistError) { + return res.status(400).send(error.message); + } + + return res.sendStatus(500); + } + + let { getStream, mimeType, fileName, totalSize } = content; + + const rangeHeader = getRangeHeader(req); + let range; + try { + range = parseRangeHeader(rangeHeader, totalSize); + } catch (error) { + logger.debug(`parseRangeHeader error: `, error); + if (error instanceof RangeParserError) { + setContentRangeHeader(null, totalSize, res); + + return res + .send(error.message) + .status(416) + .end(); + } + + return res.sendStatus(500); + } + + let { start, end } = range; + + setContentTypeHeader(mimeType, res); + setContentDispositionHeader(fileName, res); + setAcceptRangesHeader(res); + + // If range is not specified, or the file is empty, return the full stream + if (range === null) { + setContentLengthHeader(totalSize, res); + return getStream().pipe(res); + } + + setContentRangeHeader(range, totalSize, res); + setContentLengthHeader(start === end ? 0 : end - start + 1); + setCacheControlHeaderNoCache(res); + + // Return 206 Partial Content status + res.status(206); + getStream(range).pipe(res); + }; +} diff --git a/src/parseRangeHeader.ts b/src/parseRangeHeader.ts new file mode 100644 index 000000000..c3a2359e9 --- /dev/null +++ b/src/parseRangeHeader.ts @@ -0,0 +1,57 @@ +export type Range = { + start: number; + end: number; +}; + +const rangeRegEx = /bytes=([0-9]*)-([0-9]*)/; + +export class RangeParserError extends Error { + constructor(start: any, end: any) { + super(`Invalid start and end values: ${start}-${end}.`); + } +} + +export function parseRangeHeader(range: string, totalSize: number): Range | null { + // 1. If range is not specified or the file is empty, return null. + if (range === null || range.length === 0 || totalSize === 0) { + return null; + } + + const [startValue, endValue] = range.split(rangeRegEx); + let start = Number.parseInt(startValue); + let end = Number.parseInt(endValue); + + // 2. Parse start and end values and ensure they are within limits. + // 2.1. start: >= 0. + // 2.2. end: >= 0, <= totalSize - 1 + + let result = { + start: Number.isNaN(start) ? 0 : Math.max(start, 0), + end: Number.isNaN(end) ? totalSize - 1 : Math.min(Math.max(end, 0), totalSize - 1) + }; + + // 3.1. If end is not provided, set end to the last byte (totalSize - 1). + if (!Number.isNaN(start) && Number.isNaN(end)) { + result.start = start; + result.end = totalSize - 1; + + return result; + } + + // 3.2. If start is not provided, set it to the offset of last "end" bytes from the end of the file. + // And set end to the last byte. + // This way we return the last "end" bytes. + if (Number.isNaN(start) && !Number.isNaN(end)) { + result.start = totalSize - end; + result.end = totalSize - 1; + + return result; + } + + // 4. Handle invalid ranges. + if (start > end) { + throw new RangeParserError(start, end); + } + + return result; +} diff --git a/tsconfig.json b/tsconfig.json index 161653769..3ce78e686 100644 --- a/tsconfig.json +++ b/tsconfig.json @@ -1,21 +1,17 @@ { "compilerOptions": { - "module": "commonjs", - "esModuleInterop": true, - "target": "es6", - "noImplicitAny": true, - "moduleResolution": "node", - "sourceMap": true, - "outDir": "dist", - "baseUrl": ".", - "paths": { - "*": [ - "node_modules/*", - "src/types/*" - ] - } + "module": "commonjs", + "esModuleInterop": true, + "target": "es6", + "noImplicitAny": true, + "moduleResolution": "node", + "sourceMap": true, + "outDir": "dist", + "declaration": true, + "baseUrl": "src", + "paths": { + "*": ["../node_modules/*", "./types/*"] + } }, - "include": [ - "src/**/*" - ] -} \ No newline at end of file + "include": ["src/**/*"] +} diff --git a/yarn.lock b/yarn.lock index a6e1de2d2..a7290820d 100644 --- a/yarn.lock +++ b/yarn.lock @@ -2,12 +2,403 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