Mercurial > hg > digilib-old

annotate servlet/src/digilib/servlet/Scaler.java @ 563:686086d6e6d6 digilibPDF

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more refactoring and rearranging more enums pdf and image generation still works
author robcast
date Fri, 17 Dec 2010 20:42:25 +0100
parents 2e971b9f3022
children fd2ef7e46119
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1 package digilib.servlet;
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2
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3 import java.io.File;
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4 import java.io.IOException;
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5 import java.util.List;
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6 import java.util.concurrent.ExecutionException;
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7 import java.util.concurrent.Future;
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9 import javax.servlet.ServletConfig;
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10 import javax.servlet.ServletContext;
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11 import javax.servlet.ServletException;
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12 import javax.servlet.http.HttpServlet;
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13 import javax.servlet.http.HttpServletRequest;
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14 import javax.servlet.http.HttpServletResponse;
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15
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16 import org.apache.log4j.Logger;
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17
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18 import digilib.auth.AuthOpException;
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19 import digilib.auth.AuthOps;
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20 import digilib.image.DocuImage;
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21 import digilib.image.ImageJobDescription;
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22 import digilib.image.ImageWorker;
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23 import digilib.io.DocuDirCache;
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24 import digilib.io.DocuDirectory;
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25 import digilib.io.DocuDirent;
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26 import digilib.io.FileOps.FileClass;
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27 import digilib.io.ImageFile;
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28 import digilib.util.DigilibJobCenter;
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30 @SuppressWarnings("serial")
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31 public class Scaler extends HttpServlet {
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32
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33 /** digilib servlet version (for all components) */
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34 public static final String version = "1.9.0a";
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35
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36 /** servlet error codes */
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37 public static enum Error {UNKNOWN, AUTH, FILE, IMAGE};
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38
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39 /** type of error message */
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40 public static enum ErrMsg {IMAGE, TEXT, CODE};
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41
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42 /** logger for accounting requests */
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43 protected static Logger accountlog = Logger.getLogger("account.request");
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44
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45 /** gengeral logger for this class */
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46 protected static Logger logger = Logger.getLogger("digilib.servlet");
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47
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48 /** logger for authentication related */
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49 protected static Logger authlog = Logger.getLogger("digilib.auth");
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50
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51 /** DocuDirCache instance */
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52 DocuDirCache dirCache;
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53
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54 /** Image executor */
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55 DigilibJobCenter<DocuImage> imageJobCenter;
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56
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57 /** authentication error image file */
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58 File denyImgFile;
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59
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60 /** image error image file */
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61 File errorImgFile;
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62
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63 /** not found error image file */
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64 File notfoundImgFile;
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66 /** send files as is? */
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67 boolean sendFileAllowed = true;
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69 /** DigilibConfiguration instance */
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70 DigilibConfiguration dlConfig;
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72 /** use authorization database */
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73 boolean useAuthorization = true;
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75 /** AuthOps instance */
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76 AuthOps authOp;
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78 /**
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79 * Initialisation on first run.
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80 *
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81 * @throws ServletException
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82 *
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83 * @see javax.servlet.Servlet#init(javax.servlet.ServletConfig)
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84 */
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85 public void init(ServletConfig config) throws ServletException {
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86 super.init(config);
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87
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88 System.out
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89 .println("***** Digital Image Library Image Scaler Servlet (version "
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90 + version + ") *****");
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91 // say hello in the log file
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92 logger.info("***** Digital Image Library Image Scaler Servlet (version "
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93 + version + ") *****");
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95 // get our ServletContext
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96 ServletContext context = config.getServletContext();
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97 // see if there is a Configuration instance
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98 dlConfig = (DigilibConfiguration) context
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99 .getAttribute("digilib.servlet.configuration");
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100 if (dlConfig == null) {
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101 // no Configuration
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102 throw new ServletException("No Configuration!");
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103 }
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104 // set our AuthOps
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105 useAuthorization = dlConfig.getAsBoolean("use-authorization");
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106 authOp = (AuthOps) dlConfig.getValue("servlet.auth.op");
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107
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108 // DocuDirCache instance
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109 dirCache = (DocuDirCache) dlConfig.getValue("servlet.dir.cache");
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110
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111 // Executor
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112 imageJobCenter = (DigilibJobCenter<DocuImage>) dlConfig
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113 .getValue("servlet.worker.imageexecutor");
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115 denyImgFile = ServletOps.getFile(
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116 (File) dlConfig.getValue("denied-image"), config);
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117 errorImgFile = ServletOps.getFile(
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118 (File) dlConfig.getValue("error-image"), config);
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119 notfoundImgFile = ServletOps.getFile(
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120 (File) dlConfig.getValue("notfound-image"), config);
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121 sendFileAllowed = dlConfig.getAsBoolean("sendfile-allowed");
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122 }
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123
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124 /** Returns modification time relevant to the request for caching.
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125 *
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126 * @see javax.servlet.http.HttpServlet#getLastModified(javax.servlet.http.HttpServletRequest)
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127 */
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128 protected long getLastModified(HttpServletRequest request) {
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129 accountlog.debug("GetLastModified from " + request.getRemoteAddr()
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130 + " for " + request.getQueryString());
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131 long mtime = -1;
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132 // create new request
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133 DigilibRequest dlReq = new DigilibRequest(request);
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134 // find the file(set)
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135 DocuDirent f = dirCache.getFile(dlReq.getFilePath(),
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136 dlReq.getAsInt("pn"), FileClass.IMAGE);
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137 // find the requested file
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138 if (f != null) {
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139 DocuDirectory dd = (DocuDirectory) f.getParent();
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140 mtime = dd.getDirMTime() / 1000 * 1000;
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141 }
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142 return mtime;
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143 }
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144
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145 /* (non-Javadoc)
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146 * @see javax.servlet.http.HttpServlet#doGet(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
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147 */
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148 public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException {
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149 accountlog.info("GET from " + request.getRemoteAddr());
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150 this.processRequest(request, response);
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151 }
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152
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153
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154 /* (non-Javadoc)
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155 * @see javax.servlet.http.HttpServlet#doPost(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
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156 */
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157 public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException {
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158 accountlog.info("POST from " + request.getRemoteAddr());
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159 this.processRequest(request, response);
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160 }
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161
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162
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163 /** Service this request using the response.
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164 * @param request
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165 * @param response
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166 * @throws ServletException
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167 */
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168 public void processRequest(HttpServletRequest request,
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169 HttpServletResponse response) throws ServletException {
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170
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171 if (dlConfig == null) {
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172 logger.error("ERROR: No Configuration!");
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173 throw new ServletException("NO VALID digilib CONFIGURATION!");
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174 }
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175
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176 accountlog.debug("request: " + request.getQueryString());
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177 logger.debug("request: " + request.getQueryString());
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178 long startTime = System.currentTimeMillis();
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179
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180 // parse request
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181 DigilibRequest dlRequest = new DigilibRequest(request);
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182 // extract the job information
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183 ImageJobDescription jobTicket = ImageJobDescription.getInstance(dlRequest, dlConfig);
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184
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185 // type of error reporting
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186 ErrMsg errMsgType = ErrMsg.IMAGE;
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187 if (dlRequest.hasOption("errtxt")) {
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188 errMsgType = ErrMsg.TEXT;
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189 } else if (dlRequest.hasOption("errcode")) {
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190 errMsgType = ErrMsg.CODE;
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191 }
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192
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193 try {
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194 /*
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195 * check if we can fast-track without scaling
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196 */
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197 ImageFile fileToLoad = jobTicket.getFileToLoad();
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198
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199 // check permissions
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200 if (useAuthorization) {
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201 // get a list of required roles (empty if no restrictions)
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202 List<String> rolesRequired = authOp.rolesForPath(
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203 jobTicket.getFilePath(), request);
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204 if (rolesRequired != null) {
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205 authlog.debug("Role required: " + rolesRequired);
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206 authlog.debug("User: " + request.getRemoteUser());
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207 // is the current request/user authorized?
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208 if (!authOp.isRoleAuthorized(rolesRequired, request)) {
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209 // send deny answer and abort
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210 throw new AuthOpException();
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211 }
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212 }
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213 }
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63c8186455c1 Servlet version 1.6b. Further cleanup and new functionality:
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214
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215 // if requested, send image as a file
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216 if (sendFileAllowed && jobTicket.getSendAsFile()) {
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217 String mt = null;
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218 if (jobTicket.hasOption("rawfile")) {
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219 mt = "application/octet-stream";
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220 }
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221 logger.debug("Sending RAW File as is.");
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222 ServletOps.sendFile(fileToLoad.getFile(), mt, null, response);
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223 logger.info("Done in " + (System.currentTimeMillis() - startTime) + "ms");
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224 return;
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225 }
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226
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227 // if possible, send the image without actually having to transform it
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228 if (! jobTicket.isTransformRequired()) {
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229 logger.debug("Sending File as is.");
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230 ServletOps.sendFile(fileToLoad.getFile(), null, null, response);
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231 logger.info("Done in " + (System.currentTimeMillis() - startTime) + "ms");
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232 return;
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233 }
181
afe7ff98bb71 Servlet version 1.18b1
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234
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235 // check load of workers
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236 if (imageJobCenter.isBusy()) {
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237 logger.error("Servlet overloaded!");
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238 response.sendError(HttpServletResponse.SC_SERVICE_UNAVAILABLE);
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239 return;
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240 }
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241 // create job
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242 ImageWorker job = new ImageWorker(dlConfig, jobTicket);
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243 // submit job
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244 Future<DocuImage> jobResult = imageJobCenter.submit(job);
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245 // wait for result
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246 DocuImage img = jobResult.get();
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247 // send image
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248 ServletOps.sendImage(img, null, response);
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249 logger.debug("Job Processing Time: "
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250 + (System.currentTimeMillis() - startTime) + "ms");
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251
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252 } catch (IOException e) {
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253 logger.error(e.getClass() + ": " + e.getMessage());
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254 digilibError(errMsgType, Error.FILE, null, response);
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255 } catch (AuthOpException e) {
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256 logger.error(e.getClass() + ": " + e.getMessage());
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257 digilibError(errMsgType, Error.AUTH, null, response);
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258 } catch (InterruptedException e) {
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259 logger.error(e.getClass() + ": " + e.getMessage());
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260 } catch (ExecutionException e) {
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261 logger.error(e.getClass() + ": " + e.getMessage());
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262 String causeMsg = e.getCause().getMessage();
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263 logger.error("caused by: " + causeMsg);
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264 digilibError(errMsgType, Error.IMAGE, causeMsg, response);
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265 }
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266
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267 }
298
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268
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269 /**
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270 * Sends an error to the client as text or image.
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271 *
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272 * @param type
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273 * @param error
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274 * @param msg
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275 * @param response
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276 */
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277 public void digilibError(ErrMsg type, Error error, String msg,
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278 HttpServletResponse response) {
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279 try {
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280 File img = null;
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281 int status = 0;
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282 if (error == Error.AUTH) {
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283 if (msg == null) {
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284 msg = "ERROR: Unauthorized access!";
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285 }
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286 img = denyImgFile;
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287 status = HttpServletResponse.SC_FORBIDDEN;
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288 } else if (error == Error.FILE) {
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289 if (msg == null) {
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290 msg = "ERROR: Image file not found!";
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291 }
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292 img = notfoundImgFile;
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293 status = HttpServletResponse.SC_NOT_FOUND;
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294 } else {
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295 if (msg == null) {
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296 msg = "ERROR: Other image error!";
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297 }
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298 img = this.errorImgFile;
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299 status = HttpServletResponse.SC_BAD_REQUEST;
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300 }
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301 if (type == ErrMsg.TEXT) {
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302 ServletOps.htmlMessage(msg, response);
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303 } else if (type == ErrMsg.CODE) {
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304 response.sendError(status, msg);
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305 } else if (img != null) {
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306 // default: image
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307 ServletOps.sendFile(img, null, null, response);
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308 }
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309 } catch (IOException e) {
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310 logger.error("Error sending error!", e);
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311 }
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312
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313 }
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314
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315 public static String getVersion() {
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316 return version;
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317 }
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318
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319 }