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/* |
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http-base - Extensions to jdk.httpserver |
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Copyright (C) 2021 Ulrich Hilger |
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This program is free software: you can redistribute it and/or modify |
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it under the terms of the GNU Affero General Public License as |
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published by the Free Software Foundation, either version 3 of the |
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License, or (at your option) any later version. |
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU Affero General Public License for more details. |
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You should have received a copy of the GNU Affero General Public License |
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along with this program. If not, see <https://www.gnu.org/licenses/>. |
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*/ |
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package de.uhilger.httpserver.base.handler; |
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import de.uhilger.httpserver.base.HttpResponder; |
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import com.sun.net.httpserver.Headers; |
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import com.sun.net.httpserver.HttpExchange; |
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import com.sun.net.httpserver.HttpHandler; |
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import de.uhilger.httpserver.base.HttpHelper; |
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import de.uhilger.httpserver.base.actor.FileActor; |
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import java.io.File; |
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import java.io.IOException; |
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import java.util.logging.Logger; |
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/** |
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* Die Klasse FileHandler dient zur Auslieferung von Dateiinhalten über |
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* HTTP. |
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* |
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* Für das Streaming über HTTP wird die Auslieferung von Teilinhalten |
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* mit dem Accept-Ranges-Header angeboten und via Range-Header unterstützt. |
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* (vgl. https://developer.mozilla.org/en-US/docs/Web/HTTP/Range_requests) |
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* |
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* @author Ulrich Hilger |
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* @version 1, 03.06.2021, (seit 25. März 2021) |
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*/ |
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public class FileHandler implements HttpHandler { |
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/* Der Logger fuer diesen FileHandler */ |
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private static final Logger logger = Logger.getLogger(FileHandler.class.getName()); |
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/* Headernamen */ |
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public static final String RANGE_HEADER = "Range"; |
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public static final String CONTENT_RANGE_HEADER = "Content-Range"; |
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//public static final String ACCEPT_RANGES_HEADER = "Accept-Ranges"; |
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//public static final String LAST_MODIFIED_DATE_HEADER = "Last-Modified"; |
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public static final String CONTENT_TYPE = "Content-Type"; |
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public static final String CONTENT_LENGTH = "Content-Length"; |
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/* Statuscodes */ |
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public static final int SC_OK = 200; |
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public static final int SC_PARTIAL_CONTENT = 206; |
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public static final int SC_FORBIDDEN = 403; |
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public static final int SC_NOT_FOUND = 404; |
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public static final int SC_METHOD_NOT_ALLOWED = 405; |
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public static final int SC_UNPROCESSABLE_ENTITY = 422; |
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/* String Konstanten */ |
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//public static final String STR_BYTES = "bytes"; |
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public static final String STR_SLASH = "/"; |
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public static final String STR_BLANK = " "; |
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public static final String STR_DASH = "-"; |
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public static final String STR_COMMA = ","; |
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public static final String STR_DOT = "."; |
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//public static final String STR_NOT_FOUND = " not found."; |
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//public static final String LM_PATTERN = "EEE, dd MMM yyyy HH:mm:ss zzz"; |
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public static final String RANGE_PATTERN = "[^\\d-,]"; |
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public static final String WELCOME_FILE = "index.html"; |
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/* Ablageort fuer Webinhalte */ |
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//protected final String fileBase; |
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public static final String ATTR_FILE_BASE = "fileBase"; |
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public static final String ATTR_WELCOME_FILES = "welcomeFiles"; |
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/** |
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* Ein neues Objekt der Klasse FileHandler erzeugen |
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* |
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* @param absoluteDirectoryPathAndName der absolute Pfad und Name des |
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* Ordners im Dateisystem, der die Inhalte enthaelt, die von diesem |
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* Handler ausgeliefert werden sollen |
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*/ |
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/* |
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public FileHandler(String absoluteDirectoryPathAndName) { |
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this.fileBase = absoluteDirectoryPathAndName; |
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} |
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*/ |
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/** |
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* Die Datei ermitteln, die sich aus dem angefragten URL ergibt, prüfen, |
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* ob die Datei existiert und den Inhalt der Datei abhängig davon, ob ein |
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* Range-Header vorhanden ist, ganz oder teilweise ausliefern. |
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* |
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* @param e das Objekt mit Methoden zur Untersuchung der Anfrage sowie zum |
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* Anfertigen und Senden der Antwort |
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* @throws IOException falls etwas schief geht entsteht dieser Fehler |
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*/ |
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@Override |
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public void handle(HttpExchange e) throws IOException { |
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String fName = new HttpHelper().getFileName(e); |
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if (fName.startsWith(STR_DOT)) { |
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HttpResponder fs = new HttpResponder(); |
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fs.sendNotFound(e, fName); |
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} else { |
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Headers headers = e.getRequestHeaders(); |
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if (headers.containsKey(RANGE_HEADER)) { |
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FileActor fa = new FileActor(); |
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fa.serveFileParts(e, new File(e.getHttpContext().getAttributes().get(ATTR_FILE_BASE).toString(), fName)); |
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} else { |
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HttpResponder fs = new HttpResponder(); |
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File file = new File(e.getHttpContext().getAttributes().get(ATTR_FILE_BASE).toString(), fName); |
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if (fName.length() < 1 || fName.endsWith(STR_SLASH)) { |
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HttpHelper helper = new HttpHelper(); |
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File welcomeFile = helper.tryWelcomeFiles(e, fName); |
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if(welcomeFile != null) { |
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file = welcomeFile; |
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} |
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} |
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fs.serveFile(e, file); |
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} |
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} |
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} |
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/** |
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* Den Namen der gewünschten Datei aus der HTTP-Anfrage ermitteln |
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* |
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* @param e das Objekt mit Methoden zur Untersuchung der Anfrage sowie zum |
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* Anfertigen und Senden der Antwort |
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* @return Name der gewünschten Datei |
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*/ |
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/* |
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public String getFileName(HttpExchange e) { |
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String ctxPath = e.getHttpContext().getPath(); |
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String uriPath = e.getRequestURI().getPath(); |
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logger.info(uriPath); |
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return uriPath.substring(ctxPath.length()); |
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} |
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*/ |
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} |