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The ACT full stack MVC framework
There is a newer version: 1.9.2
package act.controller.captcha;

/*-
 * #%L
 * ACT Framework
 * %%
 * Copyright (C) 2014 - 2018 ActFramework
 * %%
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * #L%
 */

import static org.osgl.http.H.Format.JPG;
import static org.osgl.http.H.Header.Names.CACHE_CONTROL;

import act.app.event.SysEventId;
import act.controller.Controller;
import act.controller.annotation.UrlContext;
import act.controller.captcha.render.CaptchaImageRender;
import act.crypto.AppCrypto;
import act.handler.NonBlock;
import act.util.JsonView;
import act.util.SubClassFinder;
import org.osgl.Lang;
import org.osgl.http.H;
import org.osgl.mvc.annotation.GetAction;
import org.osgl.mvc.result.Result;
import org.osgl.util.Img;
import org.osgl.util.Output;

import javax.inject.Inject;

@UrlContext("captcha")
public class CaptchaService extends Controller.Util {

    @Inject
    private AppCrypto crypto;

    @Inject
    private CaptchaManager pluginManager;

    @SubClassFinder(callOn = SysEventId.POST_START)
    public void foundSessionGenerator(CaptchaSessionGenerator generator) {
        pluginManager.registerGenerator(generator);
    }

    @SubClassFinder(callOn = SysEventId.POST_START)
    public void foundImageRender(CaptchaImageRender render) {
        pluginManager.registerImageGenerator(render);
    }

    @GetAction()
    @NonBlock
    @JsonView
    public CaptchaSession randomSession(H.Response resp) {
        resp.addHeader(CACHE_CONTROL, "no-store");
        return pluginManager.randomGenerator().generate();
    }

    @GetAction("{encrypted}")
    public Result renderMedia(String encrypted) {
        try {
            final String text = crypto.decrypt(encrypted);
            return renderBinary(new Lang.Visitor() {
                @Override
                public void visit(Output output) throws Lang.Break {
                    CaptchaImageRender imageRender = pluginManager.randomImageRender();
                    Img.source(imageRender.render(text)).writeTo(Output.Adaptors.asOutputStream(output), JPG.contentType());
                }
            }).contentType(JPG);
        } catch (Exception e) {
            throw notFound();
        }
    }

}