@helia/verified-fetch/dist/src/utils/get-resolved-accept-header.js

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

import { isExplicitAcceptHeader, isExplicitFormatQuery, isExplicitIpldAcceptRequest } from './is-accept-explicit.js';
import { queryFormatToAcceptHeader } from './select-output-type.js';
export function getResolvedAcceptHeader({ query, headers, logger }) {
    const log = logger.forComponent('helia:verified-fetch:get-resolved-accept-header');
    const requestHeaders = new Headers(headers);
    const incomingAcceptHeader = requestHeaders.get('accept') ?? undefined;
    if (incomingAcceptHeader != null) {
        log('incoming accept header "%s"', incomingAcceptHeader);
    }
    if (!isExplicitIpldAcceptRequest({ query, headers: requestHeaders })) {
        log('no explicit IPLD content-type requested, returning incoming accept header %s', incomingAcceptHeader);
        return incomingAcceptHeader;
    }
    const queryFormatMapping = queryFormatToAcceptHeader(query?.format);
    if (query?.format != null) {
        log('incoming query format "%s", mapped to %s', query.format, queryFormatMapping);
    }
    let acceptHeader = incomingAcceptHeader;
    // if the incomingAcceptHeader is autogenerated by the requesting client (browser/curl/fetch/etc) then we may need to override it if query.format is specified
    if (!isExplicitAcceptHeader(requestHeaders) && isExplicitFormatQuery(query)) {
        log('accept header not recognized, but query format provided, setting accept header to %s', queryFormatMapping);
        acceptHeader = queryFormatMapping;
    }
    log('resolved accept header to "%s"', acceptHeader);
    return acceptHeader;
}
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