| commit | author | age | ||
| 70d888 | 1 | /* |
| U | 2 | http-image - Image extensions to jdk.httpserver |
| 3 | Copyright (C) 2021 Ulrich Hilger | |
| 4 | ||
| 5 | This program is free software: you can redistribute it and/or modify | |
| 6 | it under the terms of the GNU Affero General Public License as | |
| 7 | published by the Free Software Foundation, either version 3 of the | |
| 8 | License, or (at your option) any later version. | |
| 9 | ||
| 10 | This program is distributed in the hope that it will be useful, | |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 13 | GNU Affero General Public License for more details. | |
| 14 | ||
| 15 | You should have received a copy of the GNU Affero General Public License | |
| 16 | along with this program. If not, see <https://www.gnu.org/licenses/>. | |
| 17 | */ | |
| 18 | package de.uhilger.httpserver.image; | |
| 19 | ||
| 20 | import com.sun.net.httpserver.Filter; | |
| 21 | import com.sun.net.httpserver.HttpExchange; | |
| 22 | import de.uhilger.httpserver.base.HttpHelper; | |
| 23 | import de.uhilger.httpserver.base.handler.FileHandler; | |
| 24 | import java.io.File; | |
| 25 | import java.io.IOException; | |
| 26 | import java.util.logging.Logger; | |
| 27 | ||
| 28 | /** | |
| 29 | * Der ImageFilter erzeugt verkleinerte Versionen einer Bilddatei | |
| 30 | * nach Bedarf. Wenn die gewuenschte Dateigroesse noch nicht existiert | |
| 31 | * oder die Originaldatei neuer ist als die verkleinerte Fassung, | |
| 32 | * wird die verkleinerte Fassung neu erzeugt. | |
| 33 | * | |
| 34 | * Fuer jede Anfrage, wird geprueft ob eine Bilddatei angefragt ist, | |
| 35 | * deren Dateiname einen der folgenden Namenszusaetze enthaelt: | |
| 36 | * | |
| 37 | * 120 - "_tn" | |
| 38 | * 240 - "_kl" | |
| 39 | * 500 - "_sm" | |
| 40 | * 700 - "_mt" | |
| 41 | * 1200 - "_gr" | |
| 42 | * | |
| 43 | * Fuer diese wird geprueft, ob die Datei existiert. Wenn nicht, wird geprueft, | |
| 44 | * ob eine Bilddatei mit Dateiname ohne Namenszusatz existiert. Wenn ja, wird | |
| 45 | * aus dieser Datei die gewuenschte Fassung erzeugt. | |
| 46 | * | |
| 47 | * Beispiel: | |
| 48 | * Fuer die Anfrage nach /daten/mein-bild_tn.png wird aus der Datei | |
| 49 | * /daten/mein-bild.png eine verkleinerte Fassung der Groesse 120 Bildpunkte | |
| 50 | * entlang der laengsten Kante erzeugt, als /daten/mein-bild_tn.png gespeichert | |
| 51 | * und ausgeliefert. | |
| 52 | * | |
| 53 | * Der Filter benoetigt das Attribut | |
| 54 | * FileHandler.ATTR_FILE_BASE | |
| 55 | * im HttpContext | |
| 56 | * | |
| 57 | * @author Ulrich Hilger | |
| 58 | * @version 1, 30.06.2021 | |
| 59 | */ | |
| 60 | public class ImageFilter extends Filter { | |
| 61 | ||
| 62 | private static final Logger logger = Logger.getLogger(ImageFilter.class.getName()); | |
| 63 | ||
| 64 | public static final String DESCRIPTION = "ImageFilter"; | |
| 65 | ||
| 66 | @Override | |
| 67 | public void doFilter(HttpExchange exchange, Chain chain) throws IOException { | |
| 68 | String uriStr = exchange.getRequestURI().toString(); | |
| 69 | logger.fine(uriStr); | |
| 70 | //String ctxPath = exchange.getHttpContext().getPath(); | |
| 71 | //String uriPath = exchange.getRequestURI().getPath(); | |
| 72 | //logger.fine(uriPath); | |
| 73 | //String fName = uriPath.substring(ctxPath.length()); | |
| 74 | String fName = new HttpHelper().getFileName(exchange); | |
| 75 | logger.fine(fName); | |
| 76 | if(uriStr.endsWith(ImageActor.JPG) || uriStr.endsWith(ImageActor.JPEG) || uriStr.endsWith(ImageActor.PNG)) { | |
| 77 | File dir = new File(exchange.getHttpContext().getAttributes().get(FileHandler.ATTR_FILE_BASE).toString()); | |
| 78 | File imgfile = new File(dir, fName); | |
| 79 | ImageActor actor = new ImageActor(); | |
| 80 | if(uriStr.contains(ImageActor.TN)) { | |
| 81 | actor.createImage(dir, fName, ImageActor.TN, 120, imgfile); | |
| 82 | } else if(uriStr.contains(ImageActor.KL)) { | |
| 83 | actor.createImage(dir, fName, ImageActor.KL, 240, imgfile); | |
| 84 | } else if(uriStr.contains(ImageActor.SM)) { | |
| 85 | actor.createImage(dir, fName, ImageActor.SM, 500, imgfile); | |
| 86 | } else if(uriStr.contains(ImageActor.MT)) { | |
| 87 | actor.createImage(dir, fName, ImageActor.MT, 700, imgfile); | |
| 88 | } else if(uriStr.contains(ImageActor.GR)) { | |
| 89 | actor.createImage(dir, fName, ImageActor.GR, 1200, imgfile); | |
| 90 | } else if(uriStr.contains(ImageActor.B64)) { | |
| 91 | File b64File = imgfile; | |
| 92 | String fromName = fName.replace(ImageActor.B64, ""); | |
| 93 | File fromfile = new File(dir, fromName); | |
| 94 | //be.bildErzeugen(dir, fName, BildErzeuger.GR, 1200, imgfile); | |
| 95 | logger.fine("from: " + fromfile.getAbsolutePath() + ", to: " + b64File.getAbsolutePath()); | |
| 96 | actor.b64Image(fromfile, b64File); | |
| 97 | } | |
| 98 | } | |
| 99 | chain.doFilter(exchange); | |
| 100 | } | |
| 101 | ||
| 102 | @Override | |
| 103 | public String description() { | |
| 104 | return DESCRIPTION; | |
| 105 | } | |
| 106 | ||
| 107 | } | |
