org.ambraproject.wombat.controller.ExternalResourceController.java Source code

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Here is the source code for org.ambraproject.wombat.controller.ExternalResourceController.java

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/*
 * Copyright (c) 2017 Public Library of Science
 *
 * 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.
 */

package org.ambraproject.wombat.controller;

import com.google.common.net.HttpHeaders;
import org.ambraproject.wombat.config.site.Site;
import org.ambraproject.wombat.config.site.SiteParam;
import org.ambraproject.wombat.service.EntityNotFoundException;
import org.ambraproject.wombat.service.remote.ContentKey;
import org.ambraproject.wombat.service.remote.EditorialContentApi;
import org.ambraproject.wombat.util.CacheKey;
import org.ambraproject.wombat.util.HttpMessageUtil;
import org.ambraproject.wombat.util.ReproxyUtil;
import org.apache.http.Header;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.Collection;
import java.util.List;
import java.util.Map;

/**
 * Forwards requests for files to the content repository.
 */
@Controller
public class ExternalResourceController extends WombatController {

    public static final String EXTERNAL_RESOURCE_NAMESPACE = "indirect";

    private static final Logger log = LoggerFactory.getLogger(ExternalResourceController.class);

    @Autowired
    private EditorialContentApi editorialContentApi;

    @RequestMapping(name = "repoObject", value = "/" + EXTERNAL_RESOURCE_NAMESPACE + "/{key}")
    public void serve(HttpServletResponse response, HttpServletRequest request, @SiteParam Site site,
            @PathVariable("key") String key) throws IOException {
        serve(response, request, ContentKey.createForLatestVersion(key));
    }

    @RequestMapping(name = "versionedRepoObject", value = "/" + EXTERNAL_RESOURCE_NAMESPACE + "/{key}/{version}")
    public void serve(HttpServletResponse response, HttpServletRequest request, @SiteParam Site site,
            @PathVariable("key") String key, @PathVariable("version") String version) throws IOException {
        Integer versionInt;
        try {
            versionInt = Integer.valueOf(version);
        } catch (NumberFormatException e) {
            throw new NotFoundException("Not a valid version integer: " + version, e);
        }
        serve(response, request, ContentKey.createForVersion(key, versionInt));
    }

    @RequestMapping(name = "repoObjectUsingPublicUrl", value = "/s/file")
    public void serveWithPublicUrl(HttpServletResponse response, HttpServletRequest request, @SiteParam Site site,
            @RequestParam(value = "id", required = true) String key) throws IOException {
        serve(response, request, ContentKey.createForLatestVersion(key));
    }

    private static final int REPROXY_CACHE_FOR = 6 * 60 * 60; // 6 hours

    private void serve(HttpServletResponse responseToClient, HttpServletRequest requestFromClient, ContentKey key)
            throws IOException {
        CacheKey cacheKey = key.asCacheKey("indirect");
        Map<String, Object> fileMetadata;

        try {
            fileMetadata = editorialContentApi.requestMetadata(cacheKey, key);
        } catch (EntityNotFoundException e) {
            String message = String.format("Not found in repo: %s", key.toString());
            throw new NotFoundException(message, e);
        }

        String contentType = (String) fileMetadata.get("contentType");
        if (contentType != null) {
            responseToClient.setHeader(HttpHeaders.CONTENT_TYPE, contentType);
        }

        String downloadName = (String) fileMetadata.get("downloadName");
        if (downloadName != null) {
            responseToClient.setHeader(HttpHeaders.CONTENT_DISPOSITION, "filename=" + downloadName);
        }

        List<String> reproxyUrls = (List<String>) fileMetadata.get("reproxyURL");
        if (ReproxyUtil.applyReproxy(requestFromClient, responseToClient, reproxyUrls, REPROXY_CACHE_FOR)) {
            return;
        }

        Collection<Header> assetHeaders = HttpMessageUtil.getRequestHeaders(requestFromClient,
                ASSET_REQUEST_HEADER_WHITELIST);
        try (CloseableHttpResponse repoResponse = editorialContentApi.request(key, assetHeaders)) {
            forwardAssetResponse(repoResponse, responseToClient, false);
        } catch (EntityNotFoundException e) {
            throw new NotFoundException("File not found in repo: " + key, e);
        }
    }

}