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1 /* Texter.java -- Servlet for displaying text
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2 * Digital Image Library servlet components
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3 * Copyright (C) 2003 Robert Casties (robcast@mail.berlios.de)
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4 *
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5 * This program is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License as published by the Free
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7 * Software Foundation; either version 2 of the License, or (at your option)
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8 * any later version. Please read license.txt for the full details. A copy of
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9 * the GPL may be found at http://www.gnu.org/copyleft/lgpl.html
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10 * You should have received a copy of the GNU General Public License along with this
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11 * program; if not, write to the Free Software Foundation, Inc., 59 Temple
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12 * Place, Suite 330, Boston, MA 02111-1307 USA
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13 *
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14 * Created on 15.09.2003 by casties
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15 */
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16
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17 package digilib.servlet;
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18
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19 import java.io.IOException;
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20
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21 import javax.servlet.ServletConfig;
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22 import javax.servlet.ServletContext;
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23 import javax.servlet.ServletException;
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24 import javax.servlet.http.HttpServlet;
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25 import javax.servlet.http.HttpServletRequest;
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26 import javax.servlet.http.HttpServletResponse;
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27
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28 import org.apache.log4j.Logger;
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29
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30 import digilib.auth.AuthOps;
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31 import digilib.image.ImageOpException;
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32 import digilib.io.DocuDirCache;
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33 import digilib.io.FileOps;
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34 import digilib.io.FileOps.FileClass;
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35 import digilib.io.TextFile;
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36
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37 /**
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38 * Servlet for displaying text
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39 *
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40 *
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41 * @author casties
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42 *
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43 */
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44 public class Texter extends HttpServlet {
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45
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46 private static final long serialVersionUID = 6678666342141409867L;
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47
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48 /** Servlet version */
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49 public static String tlVersion = "0.1b3";
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50
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51 /** DigilibConfiguration instance */
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52 DigilibServletConfiguration dlConfig = null;
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53
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54 /** general logger */
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55 Logger logger = Logger.getLogger("digilib.texter");
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56
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57 /** logger for accounting requests */
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58 protected static Logger accountlog = Logger.getLogger("account.texter.request");
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59
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60 /** FileOps instance */
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61 FileOps fileOp;
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62
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63 /** AuthOps instance */
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64 AuthOps authOp;
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65
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66 /** ServletOps instance */
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67 ServletOps servletOp;
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68
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69 /** DocuDirCache instance */
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70 DocuDirCache dirCache;
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71
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72 /** use authentication */
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73 boolean useAuthentication = false;
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74
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75 /*
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76 * (non-Javadoc)
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77 *
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78 * @see javax.servlet.Servlet#init(javax.servlet.ServletConfig)
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79 */
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80 public void init(ServletConfig config) throws ServletException {
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81 super.init(config);
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82
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83 System.out.println("***** Digital Image Library Text Servlet (version "
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84 + tlVersion + ") *****");
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85
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86 // get our ServletContext
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87 ServletContext context = config.getServletContext();
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88 // see if there is a Configuration instance
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89 dlConfig = (DigilibServletConfiguration) context
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90 .getAttribute("digilib.servlet.configuration");
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91 if (dlConfig == null) {
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92 // no Configuration
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93 throw new ServletException("No Configuration!");
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94 }
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95 // say hello in the log file
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96 logger.info("***** Digital Image Library Text Servlet (version "
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97 + tlVersion + ") *****");
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98
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99 // set our AuthOps
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100 useAuthentication = dlConfig.getAsBoolean("use-authorization");
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101 authOp = (AuthOps) dlConfig.getValue("servlet.auth.op");
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102 // DocuDirCache instance
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103 dirCache = (DocuDirCache) dlConfig.getValue("servlet.dir.cache");
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104 }
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105
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106 /*
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107 * (non-Javadoc)
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108 *
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109 * @see javax.servlet.http.HttpServlet#doGet(javax.servlet.http.HttpServletRequest,
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110 * javax.servlet.http.HttpServletResponse)
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111 */
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112 protected void doGet(HttpServletRequest request,
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113 HttpServletResponse response) throws ServletException, IOException {
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114 accountlog.info("GET from " + request.getRemoteAddr());
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115 // do the processing
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116 processRequest(request, response);
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117 }
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118
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119 /*
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120 * (non-Javadoc)
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121 *
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122 * @see javax.servlet.http.HttpServlet#doPost(javax.servlet.http.HttpServletRequest,
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123 * javax.servlet.http.HttpServletResponse)
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124 */
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125 protected void doPost(HttpServletRequest request,
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126 HttpServletResponse response) throws ServletException, IOException {
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127 accountlog.info("POST from " + request.getRemoteAddr());
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128 // do the processing
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129 processRequest(request, response);
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130 }
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131
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132 protected void processRequest(HttpServletRequest request,
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133 HttpServletResponse response) {
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134
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135 /*
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136 * request parameters
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137 */
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138 // create new request with defaults
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139 DigilibServletRequest dlRequest = new DigilibServletRequest(request);
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140 try {
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141
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142 /*
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143 * find the file to load/send
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144 */
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145 TextFile f = getTextFile(dlRequest, "/txt");
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146 if (f != null) {
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147 ServletOps.sendFile(f.getFile(), null, null, response, logger);
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148 } else {
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149 f = getTextFile(dlRequest, "");
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150 if (f != null) {
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151 ServletOps.sendFile(f.getFile(), null, null, response, logger);
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152 } else {
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153 response.sendError(HttpServletResponse.SC_NOT_FOUND, "Text-File not found!");
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154 //ServletOps.htmlMessage("No Text-File!", response);
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155 }
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156 }
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157
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158 } catch (ImageOpException e) {
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159 // most likely wrong file format...
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160 logger.error("ERROR sending text file: ", e);
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161 try {
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162 response.sendError(HttpServletResponse.SC_BAD_REQUEST);
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163 } catch (IOException e1) {
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164 logger.error("ERROR sending error: ", e1);
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165 }
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166 } catch (IOException e) {
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167 logger.error("ERROR sending text file: ", e);
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168 }
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169 }
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170
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171
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172 /**
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173 * Looks for a file in the given subDirectory.
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174 *
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175 * @param dlRequest
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176 * The received request which has the file path.
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177 * @param subDirectory
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178 * The subDirectory of the file path where the file should
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179 * be found.
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180 * @return The wanted Textfile or null if there wasn't a file.
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181 */
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182
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183 private TextFile getTextFile(DigilibServletRequest dlRequest, String subDirectory) {
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184 String loadPathName = dlRequest.getFilePath() + subDirectory;
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185 // find the file(set)
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186 return (TextFile) dirCache.getFile(loadPathName, dlRequest.getAsInt("pn"),
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187 FileClass.TEXT);
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188 }
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189 } |
