de.dentrassi.eclipse.provider.ProjectProvider.java Source code

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Here is the source code for de.dentrassi.eclipse.provider.ProjectProvider.java

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/*******************************************************************************
 * Copyright (c) 2016 Jens Reimann.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     Jens Reimann - initial API and implementation
 *******************************************************************************/
package de.dentrassi.eclipse.provider;

import java.io.IOException;

import javax.servlet.http.HttpServletResponse;

import com.google.common.net.UrlEscapers;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;

import de.dentrassi.eclipse.ShieldRequest;
import de.dentrassi.eclipse.ShieldRequestException;
import de.dentrassi.eclipse.provider.eclipse.Locator;
import de.dentrassi.eclipse.provider.eclipse.Project;
import de.dentrassi.eclipse.provider.eclipse.ProjectsInformation;
import de.dentrassi.eclipse.provider.eclipse.Release;
import okhttp3.Request;
import okhttp3.Response;

public class ProjectProvider implements Provider {
    @Override
    public ShieldRequest parse(final ParseContext ctx) throws ShieldRequestException {
        final String projectId = ctx.getPath().pop();

        try {
            final Project project = fetchProjectInformation(ctx, projectId);
            if (project == null) {
                return null;
            }

            return map(project);
        } catch (final IOException e) {
            throw new ShieldRequestException(e, HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
        }
    }

    private ShieldRequest map(final Project project) {
        final Release release = Locator.latestRelease(project);
        if (release != null) {
            return new ShieldRequest(project.getTitle(), release.getTitle());
        }
        return new ShieldRequest(project.getTitle(), null);
    }

    /**
     * Fetch project information from the PMI
     *
     * @param ctx
     *            the parse context
     * @param projectId
     *            the project ID
     * @return the project information, or {@code null} if the project could not
     *         be found
     * @throws IOException
     *             in case of any IO error
     */
    protected static Project fetchProjectInformation(final ParseContext ctx, final String projectId)
            throws IOException {
        final Request.Builder req = new Request.Builder();
        req.url("https://projects.eclipse.org/json/project/"
                + UrlEscapers.urlPathSegmentEscaper().escape(projectId));

        final Response result = ctx.newCall(req.build());

        if (!result.isSuccessful()) {
            if (result.code() == 404) {
                return null;
            }

            throw new ShieldRequestException(result.message(), result.code());
        }

        final GsonBuilder gb = new GsonBuilder();
        final Gson gson = gb.create();
        final ProjectsInformation projects = gson.fromJson(result.body().charStream(), ProjectsInformation.class);
        if (projects.getProjects() == null) {
            return null;
        }
        return projects.getProjects().get(projectId);
    }

}