net.pterodactylus.sone.web.ajax.GetPostAjaxPage.java Source code

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Here is the source code for net.pterodactylus.sone.web.ajax.GetPostAjaxPage.java

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/*
 * Sone - GetPostAjaxPage.java - Copyright  20102013 David Roden
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package net.pterodactylus.sone.web.ajax;

import java.io.StringWriter;
import static com.fasterxml.jackson.databind.node.JsonNodeFactory.instance;

import com.google.common.base.Optional;

import net.pterodactylus.sone.data.Post;
import net.pterodactylus.sone.data.Sone;
import net.pterodactylus.sone.web.WebInterface;
import net.pterodactylus.sone.web.page.FreenetRequest;
import net.pterodactylus.util.io.Closer;
import net.pterodactylus.util.template.Template;
import net.pterodactylus.util.template.TemplateContext;
import net.pterodactylus.util.template.TemplateException;

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.node.ObjectNode;

/**
 * This AJAX handler retrieves information and rendered representation of a
 * {@link Post}.
 *
 * @author <a href="mailto:bombe@pterodactylus.net">David Bombe Roden</a>
 */
public class GetPostAjaxPage extends JsonPage {

    /** The template to render for posts. */
    private final Template postTemplate;

    /**
     * Creates a new get post? AJAX handler.
     *
     * @param webInterface
     *            The Sone web interface
     * @param postTemplate
     *            The template to render for posts
     */
    public GetPostAjaxPage(WebInterface webInterface, Template postTemplate) {
        super("getPost.ajax", webInterface);
        this.postTemplate = postTemplate;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    protected JsonReturnObject createJsonObject(FreenetRequest request) {
        String postId = request.getHttpRequest().getParam("post");
        Optional<Post> post = webInterface.getCore().getPost(postId);
        if (!post.isPresent()) {
            return createErrorJsonObject("invalid-post-id");
        }
        return createSuccessJsonObject().put("post",
                createJsonPost(request, post.get(), getCurrentSone(request.getToadletContext())));
    }

    /**
     * {@inheritDoc}
     */
    @Override
    protected boolean needsFormPassword() {
        return false;
    }

    //
    // PRIVATE METHODS
    //

    /**
     * Creates a JSON object from the given post. The JSON object will only
     * contain the ID of the post, its time, and its rendered HTML code.
     *
     * @param request
     *            The request being processed
     * @param post
     *            The post to create a JSON object from
     * @param currentSone
     *            The currently logged in Sone (to store in the template)
     * @return The JSON representation of the post
     */
    private JsonNode createJsonPost(FreenetRequest request, Post post, Sone currentSone) {
        ObjectNode jsonPost = new ObjectNode(instance);
        jsonPost.put("id", post.getId());
        jsonPost.put("sone", post.getSone().getId());
        jsonPost.put("recipient", post.getRecipientId().orNull());
        jsonPost.put("time", post.getTime());
        StringWriter stringWriter = new StringWriter();
        TemplateContext templateContext = webInterface.getTemplateContextFactory().createTemplateContext();
        templateContext.set("core", webInterface.getCore());
        templateContext.set("request", request);
        templateContext.set("post", post);
        templateContext.set("currentSone", currentSone);
        templateContext.set("localSones", webInterface.getCore().getLocalSones());
        try {
            postTemplate.render(templateContext, stringWriter);
        } catch (TemplateException te1) {
            /* TODO - shouldnt happen. */
        } finally {
            Closer.close(stringWriter);
        }
        jsonPost.put("html", stringWriter.toString());
        return jsonPost;
    }

}