JettyApiErrorResponses.java

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package dev.rafex.ether.http.jetty12.response;
 
import java.net.URI;
 
/*-
 * #%L
 * ether-http-jetty12
 * %%
 * Copyright (C) 2025 - 2026 Raúl Eduardo González Argote
 * %%
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 * #L%
 */
 
import java.time.Clock;
import java.util.Objects;
 
import org.eclipse.jetty.server.Response;
import org.eclipse.jetty.util.Callback;
 
import dev.rafex.ether.http.core.HttpError;
import dev.rafex.ether.http.problem.model.ProblemDetails;
import dev.rafex.ether.json.JsonCodec;
 
public final class JettyApiErrorResponses {
 
    private final JettyApiResponses responses;
    private final Clock clock;
 
    public JettyApiErrorResponses(final JsonCodec jsonCodec) {
        this(jsonCodec, Clock.systemUTC());
    }
 
    public JettyApiErrorResponses(final JsonCodec jsonCodec, final Clock clock) {
        this.responses = new JettyApiResponses(Objects.requireNonNull(jsonCodec));
        this.clock = Objects.requireNonNull(clock);
    }
 
    public void notFound(final Response response, final Callback callback) {
        error(response, callback, 404, "not_found", null, "resource not found", null);
    }
 
    public void notFound(final Response response, final Callback callback, final String path) {
        error(response, callback, 404, "not_found", null, "resource not found", path);
    }
 
    public void badRequest(final Response response, final Callback callback, final String message) {
        error(response, callback, 400, "bad_request", "bad_request", message, null);
    }
 
    public void unauthorized(final Response response, final Callback callback, final String code) {
        error(response, callback, 401, "unauthorized", code, null, null);
    }
 
    public void forbidden(final Response response, final Callback callback, final String code) {
        error(response, callback, 403, "forbidden", code, null, null);
    }
 
    public void internalServerError(final Response response, final Callback callback, final String message) {
        error(response, callback, 500, "internal_server_error", "internal_error", message, null);
    }
 
    public void error(final Response response, final Callback callback, final HttpError mapped) {
        error(response, callback, mapped, null);
    }
 
    public void error(final Response response, final Callback callback, final HttpError mapped, final String path) {
        if (mapped == null) {
            internalServerError(response, callback, "internal_error");
            return;
        }
        error(response, callback, mapped.status(), mapped.code(), null, mapped.message(), path);
    }
 
    public void error(final Response response, final Callback callback, final int status, final String error,
            final String code) {
        error(response, callback, status, error, code, null, null);
    }
 
    public void error(final Response response, final Callback callback, final int status, final String error,
            final String code, final String message) {
        error(response, callback, status, error, code, message, null);
    }
 
    public void error(final Response response, final Callback callback, final int status, final String error,
            final String code, final String message, final String path) {
        problem(response, callback, toProblem(status, error, code, message, path));
    }
 
    public void problem(final Response response, final Callback callback, final ProblemDetails problem) {
        if (problem == null) {
            internalServerError(response, callback, "problem payload is required");
            return;
        }
        responses.json(response, callback, problem.status(), problem);
    }
 
    private static String normalizeError(final String error) {
        if (error == null || error.isBlank()) {
            return "error";
        }
        return error;
    }
 
    private ProblemDetails toProblem(final int status, final String error, final String code, final String message,
            final String path) {
        final var normalizedError = normalizeError(error);
        final var title = toTitle(normalizedError);
        final var builder = ProblemDetails.builder().type(URI.create("https://rafex.dev/problems/" + normalizedError))
                .title(title).status(status).detail(message == null || message.isBlank() ? title : message)
                .property("error", normalizedError).property("timestamp", clock.instant().toString());
        if (code != null && !code.isBlank()) {
            builder.property("code", code);
        }
        if (path != null && !path.isBlank()) {
            builder.instance(URI.create(path));
            builder.property("path", path);
        }
        return builder.build();
    }
 
    private static String toTitle(final String error) {
        final var normalized = normalizeError(error).replace('_', ' ').trim();
        if (normalized.isEmpty()) {
            return "Error";
        }
        final var parts = normalized.split("\\s+");
        final var title = new StringBuilder();
        for (final var part : parts) {
            if (part.isEmpty()) {
                continue;
            }
            if (!title.isEmpty()) {
                title.append(' ');
            }
            title.append(Character.toUpperCase(part.charAt(0)));
            if (part.length() > 1) {
                title.append(part.substring(1));
            }
        }
        return title.toString();
    }
}