com.google.gerrit.httpd.raw.IndexServlet.java Source code

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Here is the source code for com.google.gerrit.httpd.raw.IndexServlet.java

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// Copyright (C) 2017 The Android Open Source Project
//
// 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.

package com.google.gerrit.httpd.raw;

import static java.nio.charset.StandardCharsets.UTF_8;
import static javax.servlet.http.HttpServletResponse.SC_OK;

import com.google.common.io.Resources;
import com.google.gerrit.common.Nullable;
import com.google.template.soy.SoyFileSet;
import com.google.template.soy.data.SanitizedContent;
import com.google.template.soy.data.SoyMapData;
import com.google.template.soy.data.UnsafeSanitizedContentOrdainer;
import com.google.template.soy.tofu.SoyTofu;
import java.io.IOException;
import java.io.OutputStream;
import java.net.URI;
import java.net.URISyntaxException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class IndexServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;
    private final byte[] indexSource;

    IndexServlet(String canonicalURL, @Nullable String cdnPath) throws URISyntaxException {
        String resourcePath = "com/google/gerrit/httpd/raw/PolyGerritIndexHtml.soy";
        SoyFileSet.Builder builder = SoyFileSet.builder();
        builder.add(Resources.getResource(resourcePath));
        SoyTofu.Renderer renderer = builder.build().compileToTofu().newRenderer("com.google.gerrit.httpd.raw.Index")
                .setContentKind(SanitizedContent.ContentKind.HTML).setData(getTemplateData(canonicalURL, cdnPath));
        indexSource = renderer.render().getBytes();
    }

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse rsp) throws IOException {
        rsp.setCharacterEncoding(UTF_8.name());
        rsp.setContentType("text/html");
        rsp.setStatus(SC_OK);
        try (OutputStream w = rsp.getOutputStream()) {
            w.write(indexSource);
        }
    }

    static String computeCanonicalPath(String canonicalURL) throws URISyntaxException {
        // If we serving from a sub-directory rather than root, determine the path
        // from the cannonical web URL.
        URI uri = new URI(canonicalURL);
        return uri.getPath().replaceAll("/$", "");
    }

    static SoyMapData getTemplateData(String canonicalURL, String cdnPath) throws URISyntaxException {
        String canonicalPath = computeCanonicalPath(canonicalURL);

        String staticPath = "";
        if (cdnPath != null) {
            staticPath = cdnPath;
        } else if (canonicalPath != null) {
            staticPath = canonicalPath;
        }

        // The resource path must be typed as safe for use in a script src.
        // TODO(wyatta): Upgrade this to use an appropriate safe URL type.
        SanitizedContent sanitizedStaticPath = UnsafeSanitizedContentOrdainer.ordainAsSafe(staticPath,
                SanitizedContent.ContentKind.TRUSTED_RESOURCE_URI);

        return new SoyMapData("canonicalPath", canonicalPath, "staticResourcePath", sanitizedStaticPath);
    }
}