Add first draft (untested).

This commit is contained in:
SukantGujar 2019-03-08 18:43:22 +05:30
parent 9a3d218c6e
commit 9422491a44
7 changed files with 575 additions and 27 deletions

View File

@ -9,7 +9,10 @@
"build-watch": "npx tsc -w" "build-watch": "npx tsc -w"
}, },
"devDependencies": { "devDependencies": {
"@types/node": "^11.10.5", "@types/express": "^4.16.1",
"typescript": "^3.3.3333" "typescript": "^3.3.3333"
},
"peerDependencies": {
"express": "^4.16.4"
} }
} }

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@ -1,2 +1,103 @@
import { Request } from "node"; import { Request, Response } from "express";
export function handler(req: Request) {} import { parseRangeHeader, RangeParserError, Range } from "./parseRangeHeader";
import { Stream } from "stream";
/**
* @type {function (Request): Promise<Content>}
*/
export type ContentProvider = (req: Request) => Promise<Content>;
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);
};
}

57
src/parseRangeHeader.ts Normal file
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@ -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;
}

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@ -7,15 +7,11 @@
"moduleResolution": "node", "moduleResolution": "node",
"sourceMap": true, "sourceMap": true,
"outDir": "dist", "outDir": "dist",
"baseUrl": ".", "declaration": true,
"baseUrl": "src",
"paths": { "paths": {
"*": [ "*": ["../node_modules/*", "./types/*"]
"node_modules/*",
"src/types/*"
]
} }
}, },
"include": [ "include": ["src/**/*"]
"src/**/*"
]
} }

393
yarn.lock
View File

@ -2,12 +2,403 @@
# yarn lockfile v1 # yarn lockfile v1
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version "2.0.4"
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integrity sha512-5erio2h9jp5CHGwcybmxmVqHmnCBZeewlfJ0pex+UW7Qny7OOZXTtH56TGNyBizkgiOwhJtMKrVzDTeKcySZwA==
dependencies:
forwarded "~0.1.2"
ipaddr.js "1.8.0"
qs@6.5.2:
version "6.5.2"
resolved "https://registry.yarnpkg.com/qs/-/qs-6.5.2.tgz#cb3ae806e8740444584ef154ce8ee98d403f3e36"
integrity sha512-N5ZAX4/LxJmF+7wN74pUD6qAh9/wnvdQcjq9TZjevvXzSUo7bfmw91saqMjzGS2xq91/odN2dW/WOl7qQHNDGA==
range-parser@~1.2.0:
version "1.2.0"
resolved "https://registry.yarnpkg.com/range-parser/-/range-parser-1.2.0.tgz#f49be6b487894ddc40dcc94a322f611092e00d5e"
integrity sha1-9JvmtIeJTdxA3MlKMi9hEJLgDV4=
raw-body@2.3.3:
version "2.3.3"
resolved "https://registry.yarnpkg.com/raw-body/-/raw-body-2.3.3.tgz#1b324ece6b5706e153855bc1148c65bb7f6ea0c3"
integrity sha512-9esiElv1BrZoI3rCDuOuKCBRbuApGGaDPQfjSflGxdy4oyzqghxu6klEkkVIvBje+FF0BX9coEv8KqW6X/7njw==
dependencies:
bytes "3.0.0"
http-errors "1.6.3"
iconv-lite "0.4.23"
unpipe "1.0.0"
safe-buffer@5.1.2:
version "5.1.2"
resolved "https://registry.yarnpkg.com/safe-buffer/-/safe-buffer-5.1.2.tgz#991ec69d296e0313747d59bdfd2b745c35f8828d"
integrity sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g==
"safer-buffer@>= 2.1.2 < 3":
version "2.1.2"
resolved "https://registry.yarnpkg.com/safer-buffer/-/safer-buffer-2.1.2.tgz#44fa161b0187b9549dd84bb91802f9bd8385cd6a"
integrity sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg==
send@0.16.2:
version "0.16.2"
resolved "https://registry.yarnpkg.com/send/-/send-0.16.2.tgz#6ecca1e0f8c156d141597559848df64730a6bbc1"
integrity sha512-E64YFPUssFHEFBvpbbjr44NCLtI1AohxQ8ZSiJjQLskAdKuriYEP6VyGEsRDH8ScozGpkaX1BGvhanqCwkcEZw==
dependencies:
debug "2.6.9"
depd "~1.1.2"
destroy "~1.0.4"
encodeurl "~1.0.2"
escape-html "~1.0.3"
etag "~1.8.1"
fresh "0.5.2"
http-errors "~1.6.2"
mime "1.4.1"
ms "2.0.0"
on-finished "~2.3.0"
range-parser "~1.2.0"
statuses "~1.4.0"
serve-static@1.13.2:
version "1.13.2"
resolved "https://registry.yarnpkg.com/serve-static/-/serve-static-1.13.2.tgz#095e8472fd5b46237db50ce486a43f4b86c6cec1"
integrity sha512-p/tdJrO4U387R9oMjb1oj7qSMaMfmOyd4j9hOFoxZe2baQszgHcSWjuya/CiT5kgZZKRudHNOA0pYXOl8rQ5nw==
dependencies:
encodeurl "~1.0.2"
escape-html "~1.0.3"
parseurl "~1.3.2"
send "0.16.2"
setprototypeof@1.1.0:
version "1.1.0"
resolved "https://registry.yarnpkg.com/setprototypeof/-/setprototypeof-1.1.0.tgz#d0bd85536887b6fe7c0d818cb962d9d91c54e656"
integrity sha512-BvE/TwpZX4FXExxOxZyRGQQv651MSwmWKZGqvmPcRIjDqWub67kTKuIMx43cZZrS/cBBzwBcNDWoFxt2XEFIpQ==
"statuses@>= 1.4.0 < 2":
version "1.5.0"
resolved "https://registry.yarnpkg.com/statuses/-/statuses-1.5.0.tgz#161c7dac177659fd9811f43771fa99381478628c"
integrity sha1-Fhx9rBd2Wf2YEfQ3cfqZOBR4Yow=
statuses@~1.4.0:
version "1.4.0"
resolved "https://registry.yarnpkg.com/statuses/-/statuses-1.4.0.tgz#bb73d446da2796106efcc1b601a253d6c46bd087"
integrity sha512-zhSCtt8v2NDrRlPQpCNtw/heZLtfUDqxBM1udqikb/Hbk52LK4nQSwr10u77iopCW5LsyHpuXS0GnEc48mLeew==
type-is@~1.6.16:
version "1.6.16"
resolved "https://registry.yarnpkg.com/type-is/-/type-is-1.6.16.tgz#f89ce341541c672b25ee7ae3c73dee3b2be50194"
integrity sha512-HRkVv/5qY2G6I8iab9cI7v1bOIdhm94dVjQCPFElW9W+3GeDOSHmy2EBYe4VTApuzolPcmgFTN3ftVJRKR2J9Q==
dependencies:
media-typer "0.3.0"
mime-types "~2.1.18"
typescript@^3.3.3333: typescript@^3.3.3333:
version "3.3.3333" version "3.3.3333"
resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.3.3333.tgz#171b2c5af66c59e9431199117a3bcadc66fdcfd6" resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.3.3333.tgz#171b2c5af66c59e9431199117a3bcadc66fdcfd6"
integrity sha512-JjSKsAfuHBE/fB2oZ8NxtRTk5iGcg6hkYXMnZ3Wc+b2RSqejEqTaem11mHASMnFilHrax3sLK0GDzcJrekZYLw== integrity sha512-JjSKsAfuHBE/fB2oZ8NxtRTk5iGcg6hkYXMnZ3Wc+b2RSqejEqTaem11mHASMnFilHrax3sLK0GDzcJrekZYLw==
unpipe@1.0.0, unpipe@~1.0.0:
version "1.0.0"
resolved "https://registry.yarnpkg.com/unpipe/-/unpipe-1.0.0.tgz#b2bf4ee8514aae6165b4817829d21b2ef49904ec"
integrity sha1-sr9O6FFKrmFltIF4KdIbLvSZBOw=
utils-merge@1.0.1:
version "1.0.1"
resolved "https://registry.yarnpkg.com/utils-merge/-/utils-merge-1.0.1.tgz#9f95710f50a267947b2ccc124741c1028427e713"
integrity sha1-n5VxD1CiZ5R7LMwSR0HBAoQn5xM=
vary@~1.1.2:
version "1.1.2"
resolved "https://registry.yarnpkg.com/vary/-/vary-1.1.2.tgz#2299f02c6ded30d4a5961b0b9f74524a18f634fc"
integrity sha1-IpnwLG3tMNSllhsLn3RSShj2NPw=