fetch-aws4/dist/fetch.js

Fetch wrap to add AWS v4 signature to the request

import aws4 from 'aws4';
const normalizeHeaders = (signedOptions) => {
    const normalizedHeaders = {};
    for (const key in signedOptions?.headers) {
        normalizedHeaders[key] = String(signedOptions?.headers[key]);
    }
    return normalizedHeaders;
};
export const wrapper = (fetch) => {
    return async (url, init) => {
        if (!init?.awsCredentials && !process.env.AWS_ACCESS_KEY_ID && !process.env.AWS_SECRET_ACCESS_KEY) {
            throw new Error('Credentials not defined.');
        }
        const parsedUrl = new URL(url.toString());
        const match = /([^.]+)\.(?:([^.]*)\.)?amazonaws\.com(\.cn)?$/.exec(parsedUrl.host);
        let options = {
            ...init,
            host: parsedUrl.host,
            path: parsedUrl.pathname + parsedUrl.search,
        };
        if (!init?.service && !match) {
            options = { ...options, service: 'execute-api' };
        }
        const signedOptions = aws4.sign(options, init?.awsCredentials);
        return fetch(url, {
            ...signedOptions,
            headers: normalizeHeaders(signedOptions),
        });
    };
};
export default wrapper(fetch);
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