@helia/verified-fetch/dist/src/utils/get-e-tag.js

A fetch-like API for obtaining verified & trustless IPFS content on the web

const getPrefix = ({ weak, reqFormat }) => {
    if (reqFormat === 'tar' || reqFormat === 'car' || reqFormat === 'ipns-record' || weak === true) {
        return 'W/';
    }
    return '';
};
const getFormatSuffix = ({ reqFormat }) => {
    if (reqFormat == null) {
        return '';
    }
    if (reqFormat === 'tar') {
        return '.x-tar';
    }
    return `.${reqFormat}`;
};
/**
 * etag
 * you need to wrap cid  with ""
 * we use strong Etags for immutable responses and weak one (prefixed with W/ ) for mutable/generated ones (ipns, car, tar, and generated HTML).
 * block and car responses should have different etag than deserialized one, so you can add some prefix like we do in existing gateway
 *
 * @see https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/ETag
 * @see https://specs.ipfs.tech/http-gateways/path-gateway/#etag-response-header
 */
export function getETag({ cid, reqFormat, weak, rangeStart, rangeEnd, contentPrefix }) {
    const prefix = getPrefix({ weak, reqFormat });
    let suffix = getFormatSuffix({ reqFormat });
    if (rangeStart != null || rangeEnd != null) {
        suffix += `.${rangeStart ?? '0'}-${rangeEnd ?? 'N'}`;
    }
    return `${prefix}"${contentPrefix ?? ''}${cid.toString()}${suffix}"`;
}
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