Mercurial > hg > digilib-old

annotate servlet3/src/main/java/digilib/servlet/Scaler.java @ 960:b2d97b842612

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moved DocuImage implementations with non-standard toolkits (JAI, ImgeJ) into separate Maven modules. default build uses jai-imageio (now only one additional JAR in webapp!).
author robcast
date Wed, 25 Jan 2012 15:13:06 +0100
parents 776347921bec
children 4e368c85cce4
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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
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7 import javax.servlet.AsyncContext;
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8 import javax.servlet.ServletConfig;
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9 import javax.servlet.ServletContext;
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10 import javax.servlet.ServletException;
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11 import javax.servlet.annotation.WebServlet;
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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.ImageOpException;
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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.ImageInput;
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26 import digilib.util.DigilibJobCenter;
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28 @WebServlet(name = "Scaler", urlPatterns = { "/Scaler", "/servlet/Scaler/*" }, asyncSupported = true)
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29 public class Scaler extends HttpServlet {
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31 private static final long serialVersionUID = 5289386646192471549L;
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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 = "2.1b1 async";
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36 /** servlet error codes */
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37 public static enum Error {
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38 UNKNOWN, AUTH, FILE, IMAGE
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39 };
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40
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41 /** type of error message */
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42 public static enum ErrMsg {
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43 IMAGE, TEXT, CODE
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44 };
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45
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46 /** default error message type */
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47 public static ErrMsg defaultErrMsgType = ErrMsg.IMAGE;
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48
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49 /** logger for accounting requests */
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50 protected static Logger accountlog = Logger.getLogger("account.request");
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51
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52 /** gengeral logger for this class */
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53 protected static Logger logger = Logger.getLogger("digilib.scaler");
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54
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55 /** logger for authentication related */
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56 protected static Logger authlog = Logger.getLogger("digilib.auth");
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57
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58 /** DocuDirCache instance */
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59 protected DocuDirCache dirCache;
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60
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61 /** Image executor */
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62 protected DigilibJobCenter<DocuImage> imageJobCenter;
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64 /** authentication error image file */
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65 public static File denyImgFile;
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67 /** image error image file */
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68 public static File errorImgFile;
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69
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70 /** not found error image file */
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71 public static File notfoundImgFile;
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73 /** send files as is? */
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74 protected boolean sendFileAllowed = true;
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75
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76 /** DigilibConfiguration instance */
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77 protected DigilibConfiguration dlConfig;
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79 /** use authorization database */
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80 protected boolean useAuthorization = true;
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81
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82 /** AuthOps instance */
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83 protected AuthOps authOp;
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85 /**
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86 * Initialisation on first run.
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87 *
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88 * @throws ServletException
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89 *
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90 * @see javax.servlet.Servlet#init(javax.servlet.ServletConfig)
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91 */
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92 public void init(ServletConfig config) throws ServletException {
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93 super.init(config);
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94
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95 System.out
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96 .println("***** Digital Image Library Image Scaler Servlet (version "
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97 + version + ") *****");
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98 // say hello in the log file
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99 logger.info("***** Digital Image Library Image Scaler Servlet (version "
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100 + version + ") *****");
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102 // get our ServletContext
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103 ServletContext context = config.getServletContext();
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104 // see if there is a Configuration instance
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105 dlConfig = (DigilibConfiguration) context
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106 .getAttribute("digilib.servlet.configuration");
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107 if (dlConfig == null) {
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108 // no Configuration
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109 throw new ServletException("No Configuration!");
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110 }
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111 // set our AuthOps
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112 useAuthorization = dlConfig.getAsBoolean("use-authorization");
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113 authOp = (AuthOps) dlConfig.getValue("servlet.auth.op");
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114
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115 // DocuDirCache instance
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116 dirCache = (DocuDirCache) dlConfig.getValue("servlet.dir.cache");
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117
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118 // Executor
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119 imageJobCenter = (DigilibJobCenter<DocuImage>) dlConfig
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120 .getValue("servlet.worker.imageexecutor");
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122 denyImgFile = ServletOps.getFile(
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123 (File) dlConfig.getValue("denied-image"), context);
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124 errorImgFile = ServletOps.getFile(
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125 (File) dlConfig.getValue("error-image"), context);
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126 notfoundImgFile = ServletOps.getFile(
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127 (File) dlConfig.getValue("notfound-image"), context);
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128 sendFileAllowed = dlConfig.getAsBoolean("sendfile-allowed");
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129 try {
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130 defaultErrMsgType = ErrMsg.valueOf(dlConfig
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131 .getAsString("default-errmsg-type"));
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132 } catch (Exception e) {
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133 // nothing to do
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134 }
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135 }
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136
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137 /**
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138 * Returns modification time relevant to the request for caching.
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139 *
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140 * @see javax.servlet.http.HttpServlet#getLastModified(javax.servlet.http.HttpServletRequest)
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141 */
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142 public long getLastModified(HttpServletRequest request) {
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143 accountlog.debug("GetLastModified from " + request.getRemoteAddr()
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144 + " for " + request.getQueryString());
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145 long mtime = -1;
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146 try {
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147 // create new digilib request
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148 DigilibServletRequest dlReq = new DigilibServletRequest(request);
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149 DocuDirectory dd = dirCache.getDirectory(dlReq.getFilePath());
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150 if (dd != null) {
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151 mtime = dd.getDirMTime() / 1000 * 1000;
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152 }
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153 } catch (Exception e) {
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154 logger.error("error in getLastModified: " + e.getMessage());
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155 }
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156 logger.debug(" returns " + mtime);
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157 return mtime;
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158 }
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159
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160 /*
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161 * (non-Javadoc)
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162 *
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163 * @see
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164 * javax.servlet.http.HttpServlet#doGet(javax.servlet.http.HttpServletRequest
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165 * , javax.servlet.http.HttpServletResponse)
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166 */
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167 public void doGet(HttpServletRequest request, HttpServletResponse response)
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168 throws ServletException {
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169 accountlog.info("GET from " + request.getRemoteAddr());
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170 this.processRequest(request, response);
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171 }
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172
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173 /*
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174 * (non-Javadoc)
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175 *
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176 * @see
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177 * javax.servlet.http.HttpServlet#doPost(javax.servlet.http.HttpServletRequest
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178 * , javax.servlet.http.HttpServletResponse)
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179 */
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180 public void doPost(HttpServletRequest request, HttpServletResponse response)
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181 throws ServletException {
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182 accountlog.info("POST from " + request.getRemoteAddr());
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183 this.processRequest(request, response);
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184 }
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185
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186 protected void doHead(HttpServletRequest req, HttpServletResponse resp)
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187 throws ServletException, IOException {
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188 logger.debug("HEAD from " + req.getRemoteAddr());
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189 super.doHead(req, resp);
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190 }
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191
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192 protected void doOptions(HttpServletRequest req, HttpServletResponse resp)
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193 throws ServletException, IOException {
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194 logger.debug("OPTIONS from " + req.getRemoteAddr());
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195 super.doOptions(req, resp);
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196 }
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197
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198 /**
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199 * Service this request using the response.
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200 *
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201 * @param request
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202 * @param response
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203 * @throws ServletException
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204 */
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205 public void processRequest(HttpServletRequest request,
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206 HttpServletResponse response) throws ServletException {
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207
544
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208 if (dlConfig == null) {
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209 logger.error("ERROR: No Configuration!");
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210 throw new ServletException("NO VALID digilib CONFIGURATION!");
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211 }
502
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212
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213 accountlog.debug("request: " + request.getQueryString());
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214 logger.debug("request: " + request.getQueryString());
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215 logger.debug("headers: " + ServletOps.headersToString(request));
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216 // logger.debug("response:"+ response + " committed=" +
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217 // response.isCommitted());
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218 final long startTime = System.currentTimeMillis();
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219
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220 // parse request
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221 DigilibServletRequest dlRequest = new DigilibServletRequest(request);
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222 // extract the job information
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223 final ImageJobDescription jobTicket = ImageJobDescription.getInstance(
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224 dlRequest, dlConfig);
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225
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226 // type of error reporting
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227 ErrMsg errMsgType = defaultErrMsgType;
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228 if (dlRequest.hasOption("errimg")) {
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229 errMsgType = ErrMsg.IMAGE;
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230 } else if (dlRequest.hasOption("errtxt")) {
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231 errMsgType = ErrMsg.TEXT;
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232 } else if (dlRequest.hasOption("errcode")) {
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233 errMsgType = ErrMsg.CODE;
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234 }
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235
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236 try {
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237 /*
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238 * check if we can fast-track without scaling
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239 */
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240 ImageInput fileToLoad = (ImageInput) jobTicket.getInput();
544
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241
547
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242 // check permissions
544
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243 if (useAuthorization) {
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244 // get a list of required roles (empty if no restrictions)
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245 List<String> rolesRequired = authOp.rolesForPath(
547
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246 jobTicket.getFilePath(), request);
544
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247 if (rolesRequired != null) {
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248 authlog.debug("Role required: " + rolesRequired);
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249 authlog.debug("User: " + request.getRemoteUser());
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250 // is the current request/user authorized?
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251 if (!authOp.isRoleAuthorized(rolesRequired, request)) {
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252 // send deny answer and abort
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253 throw new AuthOpException();
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254 }
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255 }
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256 }
79
63c8186455c1 Servlet version 1.6b. Further cleanup and new functionality:
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257
544
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258 // if requested, send image as a file
547
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259 if (sendFileAllowed && jobTicket.getSendAsFile()) {
544
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260 String mt = null;
547
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261 if (jobTicket.hasOption("rawfile")) {
544
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262 mt = "application/octet-stream";
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263 }
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264 logger.debug("Sending RAW File as is.");
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265 ServletOps.sendFile(fileToLoad.getFile(), mt, null, response,
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266 logger);
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267 logger.info("Done in "
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268 + (System.currentTimeMillis() - startTime) + "ms");
544
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269 return;
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270 }
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271
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272 // if possible, send the image without actually having to transform
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273 // it
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274 if (!jobTicket.isTransformRequired()) {
544
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275 logger.debug("Sending File as is.");
930
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276 ServletOps.sendFile(fileToLoad.getFile(), null, null, response,
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277 logger);
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278 logger.info("Done in "
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279 + (System.currentTimeMillis() - startTime) + "ms");
544
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280 return;
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281 }
181
afe7ff98bb71 Servlet version 1.18b1
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282
544
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283 // check load of workers
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284 if (imageJobCenter.isBusy()) {
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285 logger.error("Servlet overloaded!");
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286 response.sendError(HttpServletResponse.SC_SERVICE_UNAVAILABLE);
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287 return;
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288 }
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289
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290 // worker job is done asynchronously
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291 AsyncContext asyncCtx = request.startAsync(request, response);
544
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292 // create job
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293 AsyncServletWorker job = new AsyncServletWorker(dlConfig,
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294 jobTicket, asyncCtx, errMsgType, startTime);
925
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295 // AsyncServletWorker is its own AsyncListener
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296 asyncCtx.addListener(job);
544
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297 // submit job
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298 imageJobCenter.submit(job);
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299 // we're done for now
544
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300
570
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301 } catch (ImageOpException e) {
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302 logger.error(e.getClass() + ": " + e.getMessage());
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303 digilibError(errMsgType, Error.IMAGE, null, response);
544
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304 } catch (IOException e) {
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305 logger.error(e.getClass() + ": " + e.getMessage());
558
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306 digilibError(errMsgType, Error.FILE, null, response);
544
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307 } catch (AuthOpException e) {
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308 logger.error(e.getClass() + ": " + e.getMessage());
558
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309 digilibError(errMsgType, Error.AUTH, null, response);
821
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310 } catch (Exception e) {
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311 logger.error("Other Exception: ", e);
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312 // TODO: should we rethrow or swallow?
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313 // throw new ServletException(e);
543
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314 }
544
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315 }
298
1ecaf9c1fd8a Servlet version 1.5.0b -- the beginning of the next generation :-)
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316
544
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317 /**
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318 * Sends an error to the client as text or image.
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319 *
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320 * @param type
558
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321 * @param error
544
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322 * @param msg
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323 * @param response
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324 */
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325 public static void digilibError(ErrMsg type, Error error, String msg,
544
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326 HttpServletResponse response) {
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327 try {
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328 File img = null;
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329 int status = 0;
558
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330 if (error == Error.AUTH) {
544
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331 if (msg == null) {
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332 msg = "ERROR: Unauthorized access!";
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333 }
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334 img = denyImgFile;
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335 status = HttpServletResponse.SC_FORBIDDEN;
558
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336 } else if (error == Error.FILE) {
544
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337 if (msg == null) {
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338 msg = "ERROR: Image file not found!";
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339 }
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340 img = notfoundImgFile;
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341 status = HttpServletResponse.SC_NOT_FOUND;
544
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342 } else {
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343 if (msg == null) {
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344 msg = "ERROR: Other image error!";
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345 }
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346 img = errorImgFile;
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347 status = HttpServletResponse.SC_BAD_REQUEST;
544
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348 }
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349 if (response.isCommitted()) {
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350 // response already committed
930
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351 logger.warn("Response committed for error " + msg);
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352 }
558
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353 if (type == ErrMsg.TEXT) {
544
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354 ServletOps.htmlMessage(msg, response);
558
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355 } else if (type == ErrMsg.CODE) {
557
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356 response.sendError(status, msg);
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357 } else if (img != null) {
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358 // default: image
572
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359 ServletOps.sendFile(img, null, null, response, logger);
544
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360 }
570
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361 } catch (Exception e) {
544
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362 logger.error("Error sending error!", e);
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363 }
298
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364
544
5ff500d6812a more steps towards more standard java.util.concurrent design
robcast
parents: 543
diff changeset
365 }
5ff500d6812a more steps towards more standard java.util.concurrent design
robcast
parents: 543
diff changeset
366
5ff500d6812a more steps towards more standard java.util.concurrent design
robcast
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367 public static String getVersion() {
563
686086d6e6d6 more refactoring and rearranging
robcast
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368 return version;
544
5ff500d6812a more steps towards more standard java.util.concurrent design
robcast
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369 }
489
882ee6a055bd try to fix small problem with version number display
robcast
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370
500
b2325b33b77b completely restructured the scaler
cmielack
parents: 1
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371 }