com.javafxpert.wikibrowser.WikiThumbnailController.java Source code

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Here is the source code for com.javafxpert.wikibrowser.WikiThumbnailController.java

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/*
 * Copyright 2015 the original author or authors.
 *
 * 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.javafxpert.wikibrowser;

import com.javafxpert.wikibrowser.model.locator.ItemInfoResponse;
import com.javafxpert.wikibrowser.model.thumbnail.*;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import java.net.URI;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Optional;

/**
 * Created by jamesweaver on 10/13/15.
 */
@RestController
@RequestMapping("/thumbnail")
public class WikiThumbnailController {

    // TODO: Move to configuration file or service
    public static int THUMBNAIL_WIDTH = 100;

    private Log log = LogFactory.getLog(getClass());

    private final WikiBrowserProperties wikiBrowserProperties;

    @Autowired
    public WikiThumbnailController(WikiBrowserProperties wikiBrowserProperties) {
        this.wikiBrowserProperties = wikiBrowserProperties;
    }

    @RequestMapping(method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_VALUE)
    public ResponseEntity<Object> locatorEndpoint(
            @RequestParam(value = "title", defaultValue = "") String articleTitle,
            @RequestParam(value = "id", defaultValue = "") String itemId,
            @RequestParam(value = "lang") String lang) {

        String language = wikiBrowserProperties.computeLang(lang);

        String thumbnailUrlStr = null;
        if (!articleTitle.equals("")) {
            // Check cache for thumbnail
            thumbnailUrlStr = ThumbnailCache.getThumbnailUrlByTitle(articleTitle, language);

            if (thumbnailUrlStr == null) {
                log.info(
                        "Thumbnail NOT previously requested for articleTitle: " + articleTitle + ", lang: " + lang);

                thumbnailUrlStr = title2Thumbnail(articleTitle, language);
                ThumbnailCache.setThumbnailUrlByTitle(articleTitle, language, thumbnailUrlStr);
            }
        } else if (!itemId.equals("")) {
            ItemInfoResponse itemInfoResponse = null;

            // Check cache for thumbnail
            thumbnailUrlStr = ThumbnailCache.getThumbnailUrlById(itemId, language);

            if (thumbnailUrlStr == null) {
                log.info("Thumbnail NOT previously requested for itemId: " + itemId + ", lang: " + lang);

                try {
                    String url = this.wikiBrowserProperties.getLocatorServiceUrl(itemId, lang);
                    itemInfoResponse = new RestTemplate().getForObject(url, ItemInfoResponse.class);

                    //log.info(itemInfoResponse.toString());

                    if (itemInfoResponse != null) {
                        thumbnailUrlStr = title2Thumbnail(itemInfoResponse.getArticleTitle(), language);
                    } else {
                        thumbnailUrlStr = "";
                    }

                    ThumbnailCache.setThumbnailUrlById(itemId, language, thumbnailUrlStr);

                } catch (Exception e) {
                    e.printStackTrace();
                    log.info("Caught exception when calling /locator?id=" + itemId + " : " + e);
                }

            }
        }

        return Optional.ofNullable(thumbnailUrlStr).map(cr -> new ResponseEntity<>((Object) cr, HttpStatus.OK))
                .orElse(new ResponseEntity<>("Wikipedia thumbnail query unsuccessful",
                        HttpStatus.INTERNAL_SERVER_ERROR));
    }

    public String title2Thumbnail(String articleTitle, String lang) {

        //TODO: Implement better way of creating the query represented by the following variables
        String n2iqa = "https://";
        String n2iqb = ""; // Some language code e.g. en
        String n2iqc = ".wikipedia.org/w/api.php?action=query&format=json&prop=pageimages&formatversion=2&piprop=thumbnail&pithumbsize="
                + THUMBNAIL_WIDTH + "&redirects&titles=";
        String n2iqd = ""; // Some article name e.g. Ada Lovelace

        n2iqb = lang;
        n2iqd = articleTitle;

        String wpQuery = n2iqa + n2iqb + n2iqc + n2iqd;

        return queryProcessThumbnailResponse(wpQuery, lang);
    }

    private String queryProcessThumbnailResponse(String query, String lang) {
        query = query.replaceAll(" ", "%20");
        log.info("QUERY: " + query);
        ThumbnailResponse thumbnailResponse = null;
        String thumbnailUrlStr = "";
        try {
            thumbnailResponse = new RestTemplate().getForObject(new URI(query), ThumbnailResponse.class);

            log.info(thumbnailResponse.toString());

            ThumbnailQueryFar thumbnailQueryFar = thumbnailResponse.getThumbnailQueryFar();
            List<ThumbnailPagesFar> thumbnailPagesFarList = thumbnailQueryFar.getThumbnailPagesFarList();
            if (thumbnailPagesFarList.size() > 0) {
                ThumbnailPagesFar thumbnailPageFar = thumbnailPagesFarList.get(0);
                ThumbnailFar thumbnailFar = thumbnailPageFar.getThumbnailFar();

                if (thumbnailFar != null) {
                    thumbnailUrlStr = thumbnailFar.getSource();
                }
            } else {
                log.info("no pages in results");
            }
        } catch (Exception e) {
            e.printStackTrace();
            log.info("Caught exception when calling Thumbnail service " + e);
        }

        return thumbnailUrlStr;
    }

}