next/dist/esm/server/image-optimizer/extract-etag.js

The React Framework

import { createHash } from 'crypto';
export function getHash(items) {
    const hash = createHash('sha256');
    for (let item of items){
        if (typeof item === 'number') hash.update(String(item));
        else {
            hash.update(item);
        }
    }
    // See https://en.wikipedia.org/wiki/Base64#URL_applications
    return hash.digest('base64url');
}
export function extractEtag(etag, imageBuffer) {
    if (etag) {
        // upstream etag needs to be base64url encoded due to weak etag signature
        // as we store this in the cache-entry file name.
        return Buffer.from(etag).toString('base64url');
    }
    return getImageEtag(imageBuffer);
}
export function getImageEtag(image) {
    return getHash([
        image
    ]);
}

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