nl.vpro.api.client.frontend.NpoApiAuthentication Maven / Gradle / Ivy

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package nl.vpro.api.client.frontend;

import java.net.URI;
import java.nio.charset.StandardCharsets;
import java.util.*;

import org.apache.http.NameValuePair;
import org.apache.http.client.utils.URLEncodedUtils;

import nl.vpro.api.client.utils.Util;

/**
 * @author Michiel Meeuwissen
 * @since 1.11
 */
public class NpoApiAuthentication {

    private final String apiKey;

    private final String secret;

    private final String origin;

    public NpoApiAuthentication(String apiKey, String secret, String origin) {
        this.apiKey = apiKey;
        this.secret = secret;
        this.origin = origin;
    }

    public Map authenticate(URI uri) {
        String now = Util.rfc822(new Date());

        String message = message(uri, now);

        Map headers = new TreeMap<>();
        if (secret == null) {
            throw new IllegalStateException("No npo api secret found");
        }
        if (apiKey == null) {
            throw new IllegalStateException("No npo api apiKey found");
        }
        if (origin == null) {
            throw new IllegalStateException("No npo api origin found");
        }
        headers.put("Authorization", "NPO " + apiKey + ':' + Util.hmacSHA256(secret, message));
        headers.put("Origin", origin);
        headers.put("X-NPO-Date", now);
        return headers;
    }


    private String message(URI uri, String now) {

        StringBuilder sb = new StringBuilder();
        sb.append("origin:").append(origin).append(',');

        sb.append("x-npo-date:").append(now).append(',');

        sb.append("uri:").append(uri.getRawPath());

        String q = uri.getQuery();
        final List query;
        if (q != null) {
            query = URLEncodedUtils.parse(uri.getQuery(), StandardCharsets.UTF_8);
        } else {
            query = new ArrayList<>();
        }

        SortedSet sortedQuery = new TreeSet<>(
            Comparator.comparing(NameValuePair::getName)
                .thenComparing(NameValuePair::getValue)
        );

        sortedQuery.addAll(query);

        for (NameValuePair pair : sortedQuery) {
            sb.append(',').append(pair.getName()).append(':').append(pair.getValue());
        }

        return sb.toString();
    }
}