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server.js
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server.js
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#!/usr/bin/env node
require( 'dotenv' ).config();
const express = require( 'express' );
const providers = require( './providers/' );
const silhouetteImage = require('./modules/silhouetteImage');
const isUrl = require('is-url');
const app = express();
const DEFAULT_AVATAR_PROVIDER = 'file';
const DEFAULT_LISTEN_PORT = 4000;
const DEFAULT_SIZE = 80 ;
const MIN_AVATAR_SIZE = 1;
const MAX_AVATAR_SIZE = 1024;
let defaultSize = process.env.DEFAULT_SIZE || DEFAULT_SIZE;
let avatarProvider = process.env.PROVIDER || DEFAULT_AVATAR_PROVIDER;
let listenPort = process.env.LISTEN_PORT || DEFAULT_LISTEN_PORT;
if ( defaultSize < MIN_AVATAR_SIZE || defaultSize > MAX_AVATAR_SIZE ) {
console.warn( `Provided default size is either too larger or too small, falling back to ${ DEFAULT_SIZE }` );
defaultSize = DEFAULT_SIZE;
}
const providersOrder = (process.env.PROVIDER_ORDER || avatarProvider)
.split(',')
.map((providerName) => {
if (!providers[providerName]) {
throw new Error( `Could not find provider ${ providerName }` );
}
return providerName;
});
if ( providersOrder.includes('elvis') ) {
if ( typeof process.env.ELVIS_PROVIDER_SERVER === 'undefined' ) {
throw new Error( `Missing required value ELVIS_PROVIDER_SERVER for 'elvis' provider` );
}
if ( typeof process.env.ELVIS_PROVIDER_USER === 'undefined' ) {
throw new Error( `Missing required value ELVIS_PROVIDER_USER for 'elvis' provider` );
}
if ( typeof process.env.ELVIS_PROVIDER_PASSWORD === 'undefined' ) {
throw new Error( `Missing required value ELVIS_PROVIDER_PASSWORD for 'elvis' provider` );
}
if ( typeof process.env.ELVIS_PROVIDER_AVATAR_CONTAINER === 'undefined' ) {
throw new Error( `Missing required value ELVIS_PROVIDER_AVATAR_CONTAINER for 'elvis' provider` );
}
if ( typeof process.env.ELVIS_PROVIDER_AVATAR_DOMAIN === 'undefined' ) {
throw new Error( `Missing required value ELVIS_PROVIDER_AVATAR_DOMAIN for 'elvis' provider` );
}
}
app.get( '/', ( request, response ) => {
response.send( `<!DOCTYPE html>
<html lang="en">
<head>
<title>Libravatar server</title>
</head>
<body>
<h1>Libravatar image server</h1>
<p>
This is a
<a href="https://www.libravatar.org/">Libravatar</a>
compatible avatar image server powered by
<a href="https://github.com/stendahls/libravatar-server">libravatar server</a>.
</p>
<p>
Libravatar is a federated and open source alternative to the Gravatar
service and has one goal:
<strong>
Providing avatar images for email and OpenID addresses.
</strong>
</p>
<p>
Non-standard options available: <br>
<b>disallowedproviders</b>
A comma separated list of providers that shouldn't be used. Available providers are file, elivs & libaravatarOrg
</p>
</body>
</html>` );
} );
app.get( '/avatar', async ( request, response ) => {
response.status( 400 ).send( 'URI is wrong, should be avatar/$hash' );
} );
app.get( '/avatar/', async ( request, response ) => {
response.status( 400 ).send( 'Hash has to be 32 or 64 characters long' );
} );
app.get( '/avatar/:emailHash', async ( request, response ) => {
let forceDefault = false;
let avatarImage = false;
let targetSize = defaultSize;
let disallowedProviders = [];
if ( !request.params.emailHash ) {
response.sendStatus( 404 );
return false;
}
const { emailHash } = request.params;
if ( emailHash.length !== 32 && emailHash.length !== 64 ) {
response.sendStatus( 400 );
return false;
}
if ( request.query.s ) {
const querySize = Number( request.query.s );
if ( querySize >= MIN_AVATAR_SIZE && querySize <= MAX_AVATAR_SIZE ) {
targetSize = querySize;
}
}
// Make "size" take precedence if both s and size is passed
if ( request.query.size ) {
const querySize = Number( request.query.size );
if ( querySize >= MIN_AVATAR_SIZE && querySize <= MAX_AVATAR_SIZE ) {
targetSize = querySize;
}
}
if ( request.query.f ) {
forceDefault = true;
}
// Make "forcedefault" take precedence if both f and forcedefault is passed
if ( request.query.forcedefault ) {
forceDefault = true;
}
if ( request.query.disallowedproviders ){
disallowedProviders = request.query.disallowedproviders.split(',');
}
if ( !forceDefault ) {
for(const providerName of providersOrder){
if ( disallowedProviders.includes( providerName ) ) {
continue;
}
const provider = providers[providerName];
const timeHash = `${providerName}-${targetSize}-${emailHash}`;
console.time(timeHash);
try {
avatarImage = await provider(emailHash, targetSize);
} catch (providerError){
console.error(providerError);
}
console.timeEnd(timeHash);
if(avatarImage){
break;
}
}
}
if ( !avatarImage ) {
let defaultFallback = false;
if ( request.query.d ) {
defaultFallback = request.query.d;
}
// Override d with default if available
if ( request.query.default ) {
defaultFallback = request.query.default;
}
// Special values for default fallback
// https://wiki.libravatar.org/api/
// Each case can either set `avatarImage` to
// set the avatar image to return
// or return true to stop checking
if (defaultFallback === '404') {
response.sendStatus( 404 );
return true;
}
if (defaultFallback === 'mm') {
try {
avatarImage = await silhouetteImage.get(targetSize);
} catch (silhouetteError){
console.error(silhouetteError);
}
}
// If `defaultFallback` is a url, redirect to it
if ( isUrl(defaultFallback) ) {
response.redirect( 302, defaultFallback );
return true;
}
// After checking all default fallbacks, fallback
// to getting a silhouetteImage instead
if (!avatarImage) {
try {
avatarImage = await silhouetteImage.get(targetSize);
} catch (silhouetteError){
console.error(silhouetteError);
}
}
}
response.set( {
'content-type': 'image/jpg',
} );
response.send( avatarImage );
} );
app.listen( listenPort, () => {
console.log( `libravatar server now running on localhost:${ listenPort } with providers [${ providersOrder }]` );
} );