/*
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neon - Embeddable HTTP Server based on jdk.httpserver
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Copyright (C) 2024 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.neon;
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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 java.io.File;
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import java.io.IOException;
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/**
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* Objekte der Klasse FileServer liefern Dateien ueber HTTP aus
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*
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* Im Attribut FileServer.ATTR_FILE_BASE in
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* HttpExchange.getContext().getAttributes() wird das
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* Verzeichnis erwartet, aus dem Dateien ausgeliefert
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* werden sollen.
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*
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* Im Attribut FileServer.ATTR_WELCOME_FILES in
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* HttpExchange.getContext().getAttributes() kann eine
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* mit Komma getrennte Liste mit Dateinamen uebergeben
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* werden, die ausgeliefert werden sollen, wenn ein
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* Verzeichnis anstelle einer Datei angefragt ist.
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*
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* @author Ulrich Hilger
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*/
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public class FileServer {
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public static final String RANGE_HEADER = "Range";
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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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public static final String DEFAULT_INDEX_FILE = "index.html";
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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_EMPTY = "";
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public void serveFile(HttpExchange exchange) throws IOException {
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String fName = exchange.getRequestURI().getPath();
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try {
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fName = new HttpHelper().getFileName(exchange);
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File fileToDeliver = new File((String) exchange
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.getHttpContext().getAttributes()
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.getOrDefault(ATTR_FILE_BASE, STR_EMPTY), fName);
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Headers headers = exchange.getRequestHeaders();
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if (headers.containsKey(RANGE_HEADER)) {
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new PartialFileServer().serveFileParts(exchange, fileToDeliver);
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} else {
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if (fName.length() < 1 || fName.endsWith(STR_SLASH)) {
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File welcomeFile = tryWelcomeFiles(exchange, fName);
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if(welcomeFile != null) {
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fileToDeliver = welcomeFile;
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}
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}
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new HttpResponder().serveFile(exchange, fileToDeliver);
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}
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} catch(IllegalArgumentException ex) {
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new HttpResponder().sendNotFound(exchange, fName);
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}
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}
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public File tryWelcomeFiles(HttpExchange e, String fName) {
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boolean notFound = true;
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File file = null;
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String fileBase = (String) e.getHttpContext().getAttributes()
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.getOrDefault(ATTR_FILE_BASE, STR_EMPTY);
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Object welcomeFiles = e.getHttpContext().getAttributes().get(ATTR_WELCOME_FILES);
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if(welcomeFiles instanceof String) {
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String[] fileNames = welcomeFiles.toString().split(STR_COMMA);
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int i = -1;
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while(notFound && ++i < fileNames.length) {
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file = new File(fileBase, fName + fileNames[i]);
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if(file.exists()) {
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notFound = false;
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}
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}
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}
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if(notFound) {
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file = new File(fileBase, fName + DEFAULT_INDEX_FILE);
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}
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return file;
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}
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}
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