fgiova/aws-signature

import { SIGNATURE_HEADER } from "./constants";
import {escapeUri, HttpRequest} from "./utils";
export function getCanonicalQuery ({ query = {} }: HttpRequest) {
    const keys: Array<string> = [];
    const serialized: Record<string, string> = {};
    for (const key of Object.keys(query).sort()) {
        if (key.toLowerCase() === SIGNATURE_HEADER) {
            continue;
        }

        keys.push(key);
        const value = query[key];
        if (typeof value === "string") {
            serialized[key] = `${escapeUri(key)}=${escapeUri(value)}`;
        } else if (Array.isArray(value)) {
            serialized[key] = (value as Array<string>)
                .slice(0)
                .reduce(
                    (encoded: Array<string>, value: string) => encoded.concat([`${escapeUri(key)}=${escapeUri(value)}`]),
                    []
                )
                .sort()
                .join("&");
        }
    }

    return keys
        .map((key) => serialized[key])
        .filter((serialized) => serialized) // omit any falsy values
        .join("&");
}