71 lines
1.9 KiB
JavaScript
71 lines
1.9 KiB
JavaScript
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import crypto from 'node:crypto';
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/**
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* Утилита для формирования URL imgproxy через Image Gateway.
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*
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* Используется для:
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* - генерации signed URL для imgproxy
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* - программного построения URL обработки изображений
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*/
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const GATEWAY_URL = process.env.IMAGE_GATEWAY_URL ?? 'http://localhost:80';
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const KEY = process.env.IMGPROXY_KEY ?? '';
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const SALT = process.env.IMGPROXY_SALT ?? '';
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function sign(path) {
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if (!KEY || !SALT) {
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return `${GATEWAY_URL}/unsafe${path}`;
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}
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const key = Buffer.from(KEY, 'hex');
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const salt = Buffer.from(SALT, 'hex');
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const hmac = crypto.createHmac('sha256', key);
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hmac.update(salt);
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hmac.update(path);
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const sig = hmac.digest().slice(0, 32).toString('base64url');
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return `${GATEWAY_URL}/${sig}${path}`;
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}
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function encodeSrc(url) {
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return Buffer.from(url).toString('base64url');
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}
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/**
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* Формирует URL resize-операции.
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*/
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export function resize(url, { width, height, quality = 80 }) {
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const h = height ?? 0;
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const encoded = encodeSrc(url);
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const path = `/resize:fit:${width}:${h}:0/q:${quality}/${encoded}`;
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return sign(path);
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}
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/**
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* Формирует URL crop-операции.
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*/
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export function crop(url, { width, height, quality = 80 }) {
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const encoded = encodeSrc(url);
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const path = `/crop:${width}:${height}:0/q:${quality}/${encoded}`;
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return sign(path);
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}
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/**
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* Формирует URL с конвертацией формата.
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*/
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export function convert(url, { format = 'webp', quality = 80 }) {
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const encoded = encodeSrc(url);
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const path = `/q:${quality}/${encoded}.${format}`;
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return sign(path);
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}
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/**
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* Формирует произвольный URL обработки.
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*/
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export function custom(url, processingOptions) {
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const encoded = encodeSrc(url);
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const path = `/${processingOptions}/${encoded}`;
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return sign(path);
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}
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