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.eslintrc.cjs Normal file
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module.exports = {
parserOptions: {
tsconfigRootDir: __dirname,
project: ['./tsconfig.json'],
},
extends: [
'../shared/.eslintrc.js',
],
rules: {
'import/order': ['warn', {
'groups': ['builtin', 'external', 'internal', 'parent', 'sibling', 'index', 'object', 'type'],
'pathGroups': [
{
'pattern': '@/**',
'group': 'external',
'position': 'after'
}
],
}],
'no-restricted-globals': [
'error',
{
'name': '__dirname',
'message': 'Not in ESModule. Use `import.meta.url` instead.'
},
{
'name': '__filename',
'message': 'Not in ESModule. Use `import.meta.url` instead.'
}
]
},
};

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.gitignore vendored Normal file
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# Logs
logs
*.log
npm-debug.log*
# Runtime data
pids
*.pid
*.seed
# Directory for instrumented libs generated by jscoverage/JSCover
lib-cov
# Coverage directory used by tools like istanbul
coverage
# nyc test coverage
.nyc_output
# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
.grunt
# node-waf configuration
.lock-wscript
# Compiled binary addons (http://nodejs.org/api/addons.html)
build/Release
# Dependency directories
node_modules
jspm_packages
# Optional npm cache directory
.npm
# Optional REPL history
.node_repl_history
# 0x
profile-*
# mac files
.DS_Store
# vim swap files
*.swp
# webstorm
.idea
# vscode
.vscode
*code-workspace
# clinic
profile*
*clinic*
*flamegraph*
config.js

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.swcrc Normal file
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{
"$schema": "https://json.schemastore.org/swcrc",
"jsc": {
"parser": {
"syntax": "typescript",
"dynamicImport": true,
"decorators": true
},
"transform": {
"legacyDecorator": true,
"decoratorMetadata": true
},
"experimental": {
"keepImportAssertions": true
},
"baseUrl": ".",
"paths": {},
"target": "es2021"
},
"module": {
"type": "es6"
},
"minify": true
}

661
LICENSE Normal file
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GNU AFFERO GENERAL PUBLIC LICENSE
Version 3, 19 November 2007
Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
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DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
SUCH DAMAGES.
17. Interpretation of Sections 15 and 16.
If the disclaimer of warranty and limitation of liability provided
above cannot be given local legal effect according to their terms,
reviewing courts shall apply local law that most closely approximates
an absolute waiver of all civil liability in connection with the
Program, unless a warranty or assumption of liability accompanies a
copy of the Program in return for a fee.
END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
state the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper mail.
If your software can interact with users remotely through a computer
network, you should also make sure that it provides a way for users to
get its source. For example, if your program is a web application, its
interface could display a "Source" link that leads users to an archive
of the code. There are many ways you could offer source, and different
solutions will be better for different programs; see section 13 for the
specific requirements.
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU AGPL, see
<http://www.gnu.org/licenses/>.

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# Media Proxy for Misskey
Misskeyの/proxyが単体で動作します。
## config.js
次のような内容で、設定ファイルconfig.jsをルートに作成してください。
```js
const package = require('./package.json');
module.exports = {
userAgent: `MisskeyMediaProxy/${package.version}`,
allowedPrivateNetworks: [],
maxSize: 262144000,
// proxy: 'http://127.0.0.1:3128'
}
```

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export const FILE_TYPE_BROWSERSAFE=["image/png","image/gif","image/jpeg","image/webp","image/avif","image/apng","image/bmp","image/tiff","image/x-icon","audio/opus","video/ogg","audio/ogg","application/ogg","video/quicktime","video/mp4","audio/mp4","video/x-m4v","audio/x-m4a","video/3gpp","video/3gpp2","video/mpeg","audio/mpeg","video/webm","audio/webm","audio/aac","audio/x-flac","audio/vnd.wave"];

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import*as tmp from"tmp";export function createTemp(){return new Promise((res,rej)=>{tmp.file((e,path,fd,cleanup)=>{if(e)return rej(e);res([path,process.env.NODE_ENV==="production"?cleanup:()=>{}])})})}export function createTempDir(){return new Promise((res,rej)=>{tmp.dir({unsafeCleanup:true},(e,path,cleanup)=>{if(e)return rej(e);res([path,process.env.NODE_ENV==="production"?cleanup:()=>{}])})})}

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import*as fs from"node:fs";import*as stream from"node:stream";import*as util from"node:util";import got,*as Got from"got";import IPCIDR from"ip-cidr";import PrivateIp from"private-ip";import{StatusError}from"./status-error.js";import config from"../config.js";import{httpAgent,httpsAgent}from"./http.js";const pipeline=util.promisify(stream.pipeline);export async function downloadUrl(url,path){console.log(`Downloading ${url} to ${path} ...`);const timeout=30*1e3;const operationTimeout=60*1e3;const req=got.stream(url,{headers:{"User-Agent":config.userAgent},timeout:{lookup:timeout,connect:timeout,secureConnect:timeout,socket:timeout,response:timeout,send:timeout,request:operationTimeout},agent:{http:httpAgent,https:httpsAgent},http2:true,retry:{limit:0}}).on("response",res=>{if((process.env.NODE_ENV==="production"||process.env.NODE_ENV==="test")&&!config.proxy&&res.ip){if(isPrivateIp(res.ip)){console.log(`Blocked address: ${res.ip}`);req.destroy()}}const contentLength=res.headers["content-length"];if(contentLength!=null){const size=Number(contentLength);if(size>config.maxSize){console.log(`maxSize exceeded (${size} > ${config.maxSize}) on response`);req.destroy()}}}).on("downloadProgress",progress=>{if(progress.transferred>config.maxSize){console.log(`maxSize exceeded (${progress.transferred} > ${config.maxSize}) on downloadProgress`);req.destroy()}});try{await pipeline(req,fs.createWriteStream(path))}catch(e){if(e instanceof Got.HTTPError){throw new StatusError(`${e.response.statusCode} ${e.response.statusMessage}`,e.response.statusCode,e.response.statusMessage)}else{throw e}}console.log(`Download finished: ${url}`)}function isPrivateIp(ip){for(const net of config.allowedPrivateNetworks??[]){const cidr=new IPCIDR(net);if(cidr.contains(ip)){return false}}return PrivateIp(ip)??false}

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import fs from"node:fs";import{fileTypeFromFile}from"file-type";import isSvg from"is-svg";import{promisify}from"node:util";const TYPE_OCTET_STREAM={mime:"application/octet-stream",ext:null};const TYPE_SVG={mime:"image/svg+xml",ext:"svg"};async function getFileSize(path){const getStat=promisify(fs.stat);return(await getStat(path)).size}export async function detectType(path){const fileSize=await getFileSize(path);if(fileSize===0){return TYPE_OCTET_STREAM}const type=await fileTypeFromFile(path);if(type){if(type.mime==="application/xml"&&await checkSvg(path)){return TYPE_SVG}return{mime:type.mime,ext:type.ext}}if(await checkSvg(path)){return TYPE_SVG}return TYPE_OCTET_STREAM}async function checkSvg(path){try{const size=await getFileSize(path);if(size>1*1024*1024)return false;return isSvg(fs.readFileSync(path))}catch{return false}}import{FILE_TYPE_BROWSERSAFE}from"./const.js";const dictionary={"safe-file":FILE_TYPE_BROWSERSAFE,"sharp-convertible-image":["image/jpeg","image/png","image/gif","image/apng","image/vnd.mozilla.apng","image/webp","image/avif","image/svg+xml"],"sharp-animation-convertible-image":["image/jpeg","image/png","image/gif","image/webp","image/avif","image/svg+xml"]};export const isMimeImage=(mime,type)=>dictionary[type].includes(mime);

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import*as http from"node:http";import*as https from"node:https";import CacheableLookup from"cacheable-lookup";import{HttpProxyAgent,HttpsProxyAgent}from"hpagent";import config from"../config.js";const cache=new CacheableLookup({maxTtl:3600,errorTtl:30,lookup:false});const _http=new http.Agent({keepAlive:true,keepAliveMsecs:30*1e3,lookup:cache.lookup});const _https=new https.Agent({keepAlive:true,keepAliveMsecs:30*1e3,lookup:cache.lookup});export const httpAgent=config.proxy?new HttpProxyAgent({keepAlive:true,keepAliveMsecs:30*1e3,maxSockets:256,maxFreeSockets:256,scheduling:"lifo",proxy:config.proxy}):_http;export const httpsAgent=config.proxy?new HttpsProxyAgent({keepAlive:true,keepAliveMsecs:30*1e3,maxSockets:256,maxFreeSockets:256,scheduling:"lifo",proxy:config.proxy}):_https;

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import sharp from"sharp";export const webpDefault={quality:85,alphaQuality:95,lossless:false,nearLossless:false,smartSubsample:true,mixed:true};export function convertToWebpStream(path,width,height,options=webpDefault){return convertSharpToWebpStream(sharp(path),width,height,options)}export function convertSharpToWebpStream(sharp,width,height,options=webpDefault){const data=sharp.resize(width,height,{fit:"inside",withoutEnlargement:true}).rotate().webp(options);return{data,ext:"webp",type:"image/webp"}}

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import*as fs from"node:fs";import{fileURLToPath}from"node:url";import{dirname}from"node:path";import fastifyStatic from"@fastify/static";import{createTemp}from"./create-temp.js";import{FILE_TYPE_BROWSERSAFE}from"./const.js";import{convertToWebpStream,webpDefault}from"./image-processor.js";import{detectType,isMimeImage}from"./file-info.js";import sharp from"sharp";import{StatusError}from"./status-error.js";import{downloadUrl}from"./download.js";const _filename=fileURLToPath(import.meta.url);const _dirname=dirname(_filename);const assets=`${_dirname}/../../server/file/assets/`;export default function(fastify,options,done){fastify.addHook("onRequest",(request,reply,done)=>{reply.header("Content-Security-Policy","default-src 'none'; img-src 'self'; media-src 'self'; style-src 'unsafe-inline'");done()});fastify.register(fastifyStatic,{root:_dirname,serve:false});fastify.get("/proxy/:url*",async(request,reply)=>{return await proxyHandler(request,reply).catch(err=>errorHandler(request,reply,err))});done()}function errorHandler(request,reply,err){console.log(`${err}`);reply.header("Cache-Control","max-age=300");if(request.query&&"fallback"in request.query){return reply.sendFile("/dummy.png",assets)}if(err instanceof StatusError&&(err.statusCode===302||err.isClientError)){reply.code(err.statusCode);return}reply.code(500);return}async function proxyHandler(request,reply){const url="url"in request.query?request.query.url:"https://"+request.params.url;if(typeof url!=="string"){reply.code(400);return}const file=await downloadAndDetectTypeFromUrl(url);try{const isConvertibleImage=isMimeImage(file.mime,"sharp-convertible-image");const isAnimationConvertibleImage=isMimeImage(file.mime,"sharp-animation-convertible-image");let image=null;if("emoji"in request.query&&isConvertibleImage){if(!isAnimationConvertibleImage&&!("static"in request.query)){image={data:fs.createReadStream(file.path),ext:file.ext,type:file.mime}}else{const data=sharp(file.path,{animated:!("static"in request.query)}).resize({height:128,withoutEnlargement:true}).webp(webpDefault);image={data,ext:"webp",type:"image/webp"}}}else if("static"in request.query&&isConvertibleImage){image=convertToWebpStream(file.path,498,280)}else if("preview"in request.query&&isConvertibleImage){image=convertToWebpStream(file.path,200,200)}else if("badge"in request.query){if(!isConvertibleImage){throw new StatusError("Unexpected mime",404)}const mask=sharp(file.path).resize(96,96,{fit:"inside",withoutEnlargement:false}).greyscale().normalise().linear(1.75,-128*1.75+128).flatten({background:"#000"}).toColorspace("b-w");const stats=await mask.clone().stats();if(stats.entropy<.1){throw new StatusError("Skip to provide badge",404)}const data=sharp({create:{width:96,height:96,channels:4,background:{r:0,g:0,b:0,alpha:0}}}).pipelineColorspace("b-w").boolean(await mask.png().toBuffer(),"eor");image={data:await data.png().toBuffer(),ext:"png",type:"image/png"}}else if(file.mime==="image/svg+xml"){image=convertToWebpStream(file.path,2048,2048)}else if(!file.mime.startsWith("image/")||!FILE_TYPE_BROWSERSAFE.includes(file.mime)){throw new StatusError("Rejected type",403,"Rejected type")}if(!image){image={data:fs.createReadStream(file.path),ext:file.ext,type:file.mime}}if("cleanup"in file){if("pipe"in image.data&&typeof image.data.pipe==="function"){image.data.on("end",file.cleanup);image.data.on("close",file.cleanup)}else{file.cleanup()}}reply.header("Content-Type",image.type);reply.header("Cache-Control","max-age=31536000, immutable");return image.data}catch(e){if("cleanup"in file)file.cleanup();throw e}}async function downloadAndDetectTypeFromUrl(url){const[path,cleanup]=await createTemp();try{await downloadUrl(url,path);const{mime,ext}=await detectType(path);return{state:"remote",mime,ext,path,cleanup}}catch(e){cleanup();throw e}}

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export class StatusError extends Error{constructor(message,statusCode,statusMessage){super(message);this.name="StatusError";this.statusCode=statusCode;this.statusMessage=statusMessage;this.isClientError=typeof this.statusCode==="number"&&this.statusCode>=400&&this.statusCode<500}}

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{
"name": "misskey-media-proxy",
"version": "0.0.0",
"description": "The Media Proxy for Misskey",
"main": "index.js",
"packageManager": "pnpm@7.26.0",
"type": "module",
"scripts": {
"build": "swc src -d built -D",
"watch": "swc src -d built -D -w & fastify start -w -l info -P ./built/index.js",
"start": "fastify start -l info ./built/index.js"
},
"repository": {
"type": "git",
"url": "git+https://github.com/misskey-dev/media-proxy.git"
},
"author": "syuilo, tamaina",
"license": "AGPL-3.0-or-later",
"bugs": {
"url": "https://github.com/misskey-dev/media-proxy/issues"
},
"homepage": "https://github.com/misskey-dev/media-proxy#readme",
"devDependencies": {
"@fastify/static": "^6.8.0",
"@swc/cli": "^0.1.61",
"@swc/core": "^1.3.32",
"@types/sharp": "^0.31.1",
"@types/tmp": "^0.2.3"
},
"dependencies": {
"cacheable-lookup": "^7.0.0",
"fastify": "^4.12.0",
"fastify-cli": "^5.7.1",
"file-type": "^18.2.0",
"got": "^12.5.3",
"hpagent": "^1.2.0",
"ip-cidr": "^3.1.0",
"is-svg": "^4.3.2",
"private-ip": "^3.0.0",
"sharp": "^0.31.3",
"tmp": "^0.2.1"
}
}

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// ブラウザで直接表示することを許可するファイルの種類のリスト
// ここに含まれないものは application/octet-stream としてレスポンスされる
// SVGはXSSを生むので許可しない
export const FILE_TYPE_BROWSERSAFE = [
// Images
'image/png',
'image/gif',
'image/jpeg',
'image/webp',
'image/avif',
'image/apng',
'image/bmp',
'image/tiff',
'image/x-icon',
// OggS
'audio/opus',
'video/ogg',
'audio/ogg',
'application/ogg',
// ISO/IEC base media file format
'video/quicktime',
'video/mp4',
'audio/mp4',
'video/x-m4v',
'audio/x-m4a',
'video/3gpp',
'video/3gpp2',
'video/mpeg',
'audio/mpeg',
'video/webm',
'audio/webm',
'audio/aac',
'audio/x-flac',
'audio/vnd.wave',
];
/*
https://github.com/sindresorhus/file-type/blob/main/supported.js
https://github.com/sindresorhus/file-type/blob/main/core.js
https://developer.mozilla.org/en-US/docs/Web/Media/Formats/Containers
*/

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import * as tmp from 'tmp';
export function createTemp(): Promise<[string, () => void]> {
return new Promise<[string, () => void]>((res, rej) => {
tmp.file((e, path, fd, cleanup) => {
if (e) return rej(e);
res([path, process.env.NODE_ENV === 'production' ? cleanup : () => {}]);
});
});
}
export function createTempDir(): Promise<[string, () => void]> {
return new Promise<[string, () => void]>((res, rej) => {
tmp.dir(
{
unsafeCleanup: true,
},
(e, path, cleanup) => {
if (e) return rej(e);
res([path, process.env.NODE_ENV === 'production' ? cleanup : () => {}]);
},
);
});
}

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import * as fs from 'node:fs';
import * as stream from 'node:stream';
import * as util from 'node:util';
import got, * as Got from 'got';
import IPCIDR from 'ip-cidr';
import PrivateIp from 'private-ip';
import { StatusError } from './status-error.js';
import config from '../config.js';
import { httpAgent, httpsAgent } from './http.js';
const pipeline = util.promisify(stream.pipeline);
export async function downloadUrl(url: string, path: string): Promise<void> {
console.log(`Downloading ${url} to ${path} ...`);
const timeout = 30 * 1000;
const operationTimeout = 60 * 1000;
const req = got.stream(url, {
headers: {
'User-Agent': config.userAgent,
},
timeout: {
lookup: timeout,
connect: timeout,
secureConnect: timeout,
socket: timeout, // read timeout
response: timeout,
send: timeout,
request: operationTimeout, // whole operation timeout
},
agent: {
http: httpAgent,
https: httpsAgent,
},
http2: true,
retry: {
limit: 0,
},
}).on('response', (res: Got.Response) => {
if ((process.env.NODE_ENV === 'production' || process.env.NODE_ENV === 'test') && !config.proxy && res.ip) {
if (isPrivateIp(res.ip)) {
console.log(`Blocked address: ${res.ip}`);
req.destroy();
}
}
const contentLength = res.headers['content-length'];
if (contentLength != null) {
const size = Number(contentLength);
if (size > config.maxSize) {
console.log(`maxSize exceeded (${size} > ${config.maxSize}) on response`);
req.destroy();
}
}
}).on('downloadProgress', (progress: Got.Progress) => {
if (progress.transferred > config.maxSize) {
console.log(`maxSize exceeded (${progress.transferred} > ${config.maxSize}) on downloadProgress`);
req.destroy();
}
});
try {
await pipeline(req, fs.createWriteStream(path));
} catch (e) {
if (e instanceof Got.HTTPError) {
throw new StatusError(`${e.response.statusCode} ${e.response.statusMessage}`, e.response.statusCode, e.response.statusMessage);
} else {
throw e;
}
}
console.log(`Download finished: ${url}`);
}
function isPrivateIp(ip: string): boolean {
for (const net of config.allowedPrivateNetworks ?? []) {
const cidr = new IPCIDR(net);
if (cidr.contains(ip)) {
return false;
}
}
return PrivateIp(ip) ?? false;
}

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import fs from 'node:fs';
import { fileTypeFromFile } from 'file-type';
import isSvg from 'is-svg';
import { promisify } from 'node:util';
const TYPE_OCTET_STREAM = {
mime: 'application/octet-stream',
ext: null,
};
const TYPE_SVG = {
mime: 'image/svg+xml',
ext: 'svg',
};
async function getFileSize(path: string): Promise<number> {
const getStat = promisify(fs.stat);
return (await getStat(path)).size;
}
export async function detectType(path: string): Promise<{
mime: string;
ext: string | null;
}> {
// Check 0 byte
const fileSize = await getFileSize(path);
if (fileSize === 0) {
return TYPE_OCTET_STREAM;
}
const type = await fileTypeFromFile(path);
if (type) {
// XMLはSVGかもしれない
if (type.mime === 'application/xml' && await checkSvg(path)) {
return TYPE_SVG;
}
return {
mime: type.mime,
ext: type.ext,
};
}
// 種類が不明でもSVGかもしれない
if (await checkSvg(path)) {
return TYPE_SVG;
}
// それでも種類が不明なら application/octet-stream にする
return TYPE_OCTET_STREAM;
}
async function checkSvg(path: string) {
try {
const size = await getFileSize(path);
if (size > 1 * 1024 * 1024) return false;
return isSvg(fs.readFileSync(path));
} catch {
return false;
}
}
import { FILE_TYPE_BROWSERSAFE } from './const.js';
const dictionary = {
'safe-file': FILE_TYPE_BROWSERSAFE,
'sharp-convertible-image': ['image/jpeg', 'image/png', 'image/gif', 'image/apng', 'image/vnd.mozilla.apng', 'image/webp', 'image/avif', 'image/svg+xml'],
'sharp-animation-convertible-image': ['image/jpeg', 'image/png', 'image/gif', 'image/webp', 'image/avif', 'image/svg+xml'],
};
export const isMimeImage = (mime: string, type: keyof typeof dictionary): boolean => dictionary[type].includes(mime);

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import * as http from 'node:http';
import * as https from 'node:https';
import CacheableLookup from 'cacheable-lookup';
import { HttpProxyAgent, HttpsProxyAgent } from 'hpagent';
import config from "../config.js";
const cache = new CacheableLookup({
maxTtl: 3600, // 1hours
errorTtl: 30, // 30secs
lookup: false, // nativeのdns.lookupにfallbackしない
});
const _http = new http.Agent({
keepAlive: true,
keepAliveMsecs: 30 * 1000,
lookup: cache.lookup,
} as http.AgentOptions);
const _https = new https.Agent({
keepAlive: true,
keepAliveMsecs: 30 * 1000,
lookup: cache.lookup,
} as https.AgentOptions);
export const httpAgent = config.proxy
? new HttpProxyAgent({
keepAlive: true,
keepAliveMsecs: 30 * 1000,
maxSockets: 256,
maxFreeSockets: 256,
scheduling: 'lifo',
proxy: config.proxy,
})
: _http;
export const httpsAgent = config.proxy
? new HttpsProxyAgent({
keepAlive: true,
keepAliveMsecs: 30 * 1000,
maxSockets: 256,
maxFreeSockets: 256,
scheduling: 'lifo',
proxy: config.proxy,
})
: _https;

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import sharp from 'sharp';
import { Readable } from 'node:stream';
export type IImage = {
data: Buffer;
ext: string | null;
type: string;
};
export type IImageStream = {
data: Readable;
ext: string | null;
type: string;
};
export type IImageStreamable = IImage | IImageStream;
export const webpDefault: sharp.WebpOptions = {
quality: 85,
alphaQuality: 95,
lossless: false,
nearLossless: false,
smartSubsample: true,
mixed: true,
};
export function convertToWebpStream(path: string, width: number, height: number, options: sharp.WebpOptions = webpDefault): IImageStream {
return convertSharpToWebpStream(sharp(path), width, height, options);
}
export function convertSharpToWebpStream(sharp: sharp.Sharp, width: number, height: number, options: sharp.WebpOptions = webpDefault): IImageStream {
const data = sharp
.resize(width, height, {
fit: 'inside',
withoutEnlargement: true,
})
.rotate()
.webp(options)
return {
data,
ext: 'webp',
type: 'image/webp',
};
}

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import * as fs from 'node:fs';
import { fileURLToPath } from 'node:url';
import { dirname } from 'node:path';
import fastifyStatic from '@fastify/static';
import { createTemp } from './create-temp.js';
import { FILE_TYPE_BROWSERSAFE } from './const.js';
import { IImageStreamable, convertToWebpStream, webpDefault } from './image-processor.js';
import type { FastifyInstance, FastifyRequest, FastifyReply, FastifyPluginOptions } from 'fastify';
import { detectType, isMimeImage } from './file-info.js';
import sharp from 'sharp';
import { StatusError } from './status-error.js';
import { downloadUrl } from './download.js';
const _filename = fileURLToPath(import.meta.url);
const _dirname = dirname(_filename);
const assets = `${_dirname}/../../server/file/assets/`;
export default function (fastify: FastifyInstance, options: FastifyPluginOptions, done: (err?: Error) => void) {
fastify.addHook('onRequest', (request, reply, done) => {
reply.header('Content-Security-Policy', `default-src 'none'; img-src 'self'; media-src 'self'; style-src 'unsafe-inline'`);
done();
});
fastify.register(fastifyStatic, {
root: _dirname,
serve: false,
});
fastify.get<{
Params: { url: string; };
Querystring: { url?: string; };
}>('/proxy/:url*', async (request, reply) => {
return await proxyHandler(request, reply)
.catch(err => errorHandler(request, reply, err));
});
done();
}
function errorHandler(request: FastifyRequest<{ Params?: { [x: string]: any }; Querystring?: { [x: string]: any }; }>, reply: FastifyReply, err?: any) {
console.log(`${err}`);
reply.header('Cache-Control', 'max-age=300');
if (request.query && 'fallback' in request.query) {
return reply.sendFile('/dummy.png', assets);
}
if (err instanceof StatusError && (err.statusCode === 302 || err.isClientError)) {
reply.code(err.statusCode);
return;
}
reply.code(500);
return;
}
async function proxyHandler(request: FastifyRequest<{ Params: { url: string; }; Querystring: { url?: string; }; }>, reply: FastifyReply) {
const url = 'url' in request.query ? request.query.url : 'https://' + request.params.url;
if (typeof url !== 'string') {
reply.code(400);
return;
}
// Create temp file
const file = await downloadAndDetectTypeFromUrl(url);
try {
const isConvertibleImage = isMimeImage(file.mime, 'sharp-convertible-image');
const isAnimationConvertibleImage = isMimeImage(file.mime, 'sharp-animation-convertible-image');
let image: IImageStreamable | null = null;
if ('emoji' in request.query && isConvertibleImage) {
if (!isAnimationConvertibleImage && !('static' in request.query)) {
image = {
data: fs.createReadStream(file.path),
ext: file.ext,
type: file.mime,
};
} else {
const data = sharp(file.path, { animated: !('static' in request.query) })
.resize({
height: 128,
withoutEnlargement: true,
})
.webp(webpDefault);
image = {
data,
ext: 'webp',
type: 'image/webp',
};
}
} else if ('static' in request.query && isConvertibleImage) {
image = convertToWebpStream(file.path, 498, 280);
} else if ('preview' in request.query && isConvertibleImage) {
image = convertToWebpStream(file.path, 200, 200);
} else if ('badge' in request.query) {
if (!isConvertibleImage) {
// 画像でないなら404でお茶を濁す
throw new StatusError('Unexpected mime', 404);
}
const mask = sharp(file.path)
.resize(96, 96, {
fit: 'inside',
withoutEnlargement: false,
})
.greyscale()
.normalise()
.linear(1.75, -(128 * 1.75) + 128) // 1.75x contrast
.flatten({ background: '#000' })
.toColorspace('b-w');
const stats = await mask.clone().stats();
if (stats.entropy < 0.1) {
// エントロピーがあまりない場合は404にする
throw new StatusError('Skip to provide badge', 404);
}
const data = sharp({
create: { width: 96, height: 96, channels: 4, background: { r: 0, g: 0, b: 0, alpha: 0 } },
})
.pipelineColorspace('b-w')
.boolean(await mask.png().toBuffer(), 'eor');
image = {
data: await data.png().toBuffer(),
ext: 'png',
type: 'image/png',
};
} else if (file.mime === 'image/svg+xml') {
image = convertToWebpStream(file.path, 2048, 2048);
} else if (!file.mime.startsWith('image/') || !FILE_TYPE_BROWSERSAFE.includes(file.mime)) {
throw new StatusError('Rejected type', 403, 'Rejected type');
}
if (!image) {
image = {
data: fs.createReadStream(file.path),
ext: file.ext,
type: file.mime,
};
}
if ('cleanup' in file) {
if ('pipe' in image.data && typeof image.data.pipe === 'function') {
// image.dataがstreamなら、stream終了後にcleanup
image.data.on('end', file.cleanup);
image.data.on('close', file.cleanup);
} else {
// image.dataがstreamでないなら直ちにcleanup
file.cleanup();
}
}
reply.header('Content-Type', image.type);
reply.header('Cache-Control', 'max-age=31536000, immutable');
return image.data;
} catch (e) {
if ('cleanup' in file) file.cleanup();
throw e;
}
}
async function downloadAndDetectTypeFromUrl(url: string): Promise<
{ state: 'remote'; mime: string; ext: string | null; path: string; cleanup: () => void; }
> {
const [path, cleanup] = await createTemp();
try {
await downloadUrl(url, path);
const { mime, ext } = await detectType(path);
return {
state: 'remote',
mime, ext,
path, cleanup,
}
} catch (e) {
cleanup();
throw e;
}
}

13
src/status-error.ts Normal file
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@ -0,0 +1,13 @@
export class StatusError extends Error {
public statusCode: number;
public statusMessage?: string;
public isClientError: boolean;
constructor(message: string, statusCode: number, statusMessage?: string) {
super(message);
this.name = 'StatusError';
this.statusCode = statusCode;
this.statusMessage = statusMessage;
this.isClientError = typeof this.statusCode === 'number' && this.statusCode >= 400 && this.statusCode < 500;
}
}

49
tsconfig.json Normal file
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@ -0,0 +1,49 @@
{
"compilerOptions": {
"allowJs": true,
"noEmitOnError": false,
"noImplicitAny": true,
"noImplicitReturns": true,
"noUnusedParameters": false,
"noUnusedLocals": false,
"noFallthroughCasesInSwitch": true,
"declaration": false,
"sourceMap": false,
"target": "es2021",
"module": "esnext",
"moduleResolution": "node",
"allowSyntheticDefaultImports": true,
"removeComments": false,
"noLib": false,
"strict": true,
"strictNullChecks": true,
"strictPropertyInitialization": false,
"skipLibCheck": true,
"experimentalDecorators": true,
"emitDecoratorMetadata": true,
"resolveJsonModule": true,
"isolatedModules": true,
"rootDir": "./src",
"baseUrl": "./",
"paths": {
"@/*": [
"./src/*"
]
},
"outDir": "./built",
"types": [
"node"
],
"typeRoots": [
"./node_modules/@types",
"./src/@types"
],
"lib": [
"esnext"
]
},
"compileOnSave": false,
"include": [
"./src/**/*.ts"
],
}