Mercurial > hg > digilib-old
annotate servlet/src/digilib/servlet/Scaler.java @ 806:d811204ce5a4 stream
Initialiser is now a ServletContextListener (doesn't need web.xml).
author | robcast |
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date | Sun, 20 Feb 2011 00:02:51 +0100 |
parents | 587c90bc5976 |
children | e6d0cdaa7923 |
rev | line source |
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1 | 1 package digilib.servlet; |
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; |
1 | 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; |
557 | 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 |
557 | 16 import org.apache.log4j.Logger; |
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; |
557 | 21 import digilib.image.ImageJobDescription; |
570 | 22 import digilib.image.ImageOpException; |
86 | 23 import digilib.io.DocuDirCache; |
335 | 24 import digilib.io.DocuDirectory; |
588 | 25 import digilib.io.ImageInput; |
557 | 26 import digilib.util.DigilibJobCenter; |
1 | 27 |
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28 @WebServlet(name="Scaler", urlPatterns={"/Scaler", "/servlet/Scaler/*"}, asyncSupported=true) |
557 | 29 public class Scaler extends HttpServlet { |
263 | 30 |
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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 = "1.9.1a3"; |
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35 |
558 | 36 /** servlet error codes */ |
37 public static enum Error {UNKNOWN, AUTH, FILE, IMAGE}; | |
38 | |
39 /** type of error message */ | |
40 public static enum ErrMsg {IMAGE, TEXT, CODE}; | |
41 | |
557 | 42 /** logger for accounting requests */ |
43 protected static Logger accountlog = Logger.getLogger("account.request"); | |
44 | |
45 /** gengeral logger for this class */ | |
572 | 46 protected static Logger logger = Logger.getLogger("digilib.scaler"); |
557 | 47 |
48 /** logger for authentication related */ | |
49 protected static Logger authlog = Logger.getLogger("digilib.auth"); | |
50 | |
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51 /** DocuDirCache instance */ |
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52 DocuDirCache dirCache; |
161 | 53 |
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54 /** Image executor */ |
547 | 55 DigilibJobCenter<DocuImage> imageJobCenter; |
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56 |
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57 /** authentication error image file */ |
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58 static File denyImgFile; |
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59 |
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60 /** image error image file */ |
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61 static File errorImgFile; |
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62 |
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63 /** not found error image file */ |
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64 static File notfoundImgFile; |
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65 |
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66 /** send files as is? */ |
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67 boolean sendFileAllowed = true; |
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68 |
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69 /** DigilibConfiguration instance */ |
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70 DigilibConfiguration dlConfig; |
1 | 71 |
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72 /** use authorization database */ |
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73 boolean useAuthorization = true; |
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74 |
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75 /** AuthOps instance */ |
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76 AuthOps authOp; |
1 | 77 |
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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); |
181 | 87 |
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88 System.out |
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89 .println("***** Digital Image Library Image Scaler Servlet (version " |
563 | 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 " |
563 | 93 + version + ") *****"); |
1 | 94 |
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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.getAttribute("digilib.servlet.configuration"); |
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99 if (dlConfig == null) { |
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100 // no Configuration |
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101 throw new ServletException("No Configuration!"); |
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102 } |
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103 // set our AuthOps |
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104 useAuthorization = dlConfig.getAsBoolean("use-authorization"); |
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105 authOp = (AuthOps) dlConfig.getValue("servlet.auth.op"); |
1 | 106 |
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107 // DocuDirCache instance |
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108 dirCache = (DocuDirCache) dlConfig.getValue("servlet.dir.cache"); |
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109 |
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110 // Executor |
547 | 111 imageJobCenter = (DigilibJobCenter<DocuImage>) dlConfig |
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112 .getValue("servlet.worker.imageexecutor"); |
1 | 113 |
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114 denyImgFile = ServletOps.getFile( |
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115 (File) dlConfig.getValue("denied-image"), context); |
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116 errorImgFile = ServletOps.getFile( |
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117 (File) dlConfig.getValue("error-image"), context); |
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118 notfoundImgFile = ServletOps.getFile( |
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119 (File) dlConfig.getValue("notfound-image"), context); |
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120 sendFileAllowed = dlConfig.getAsBoolean("sendfile-allowed"); |
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121 } |
1 | 122 |
557 | 123 /** Returns modification time relevant to the request for caching. |
547 | 124 * |
125 * @see javax.servlet.http.HttpServlet#getLastModified(javax.servlet.http.HttpServletRequest) | |
126 */ | |
750 | 127 public long getLastModified(HttpServletRequest request) { |
547 | 128 accountlog.debug("GetLastModified from " + request.getRemoteAddr() |
129 + " for " + request.getQueryString()); | |
130 long mtime = -1; | |
131 // create new request | |
132 DigilibRequest dlReq = new DigilibRequest(request); | |
752 | 133 DocuDirectory dd = dirCache.getDirectory(dlReq.getFilePath()); |
134 if (dd != null) { | |
547 | 135 mtime = dd.getDirMTime() / 1000 * 1000; |
136 } | |
750 | 137 logger.debug(" returns "+mtime); |
547 | 138 return mtime; |
139 } | |
140 | |
557 | 141 /* (non-Javadoc) |
142 * @see javax.servlet.http.HttpServlet#doGet(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse) | |
143 */ | |
144 public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException { | |
145 accountlog.info("GET from " + request.getRemoteAddr()); | |
146 this.processRequest(request, response); | |
147 } | |
547 | 148 |
557 | 149 |
150 /* (non-Javadoc) | |
151 * @see javax.servlet.http.HttpServlet#doPost(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse) | |
152 */ | |
153 public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException { | |
154 accountlog.info("POST from " + request.getRemoteAddr()); | |
155 this.processRequest(request, response); | |
156 } | |
157 | |
158 | |
750 | 159 protected void doHead(HttpServletRequest req, HttpServletResponse resp) |
160 throws ServletException, IOException { | |
161 logger.debug("HEAD from "+req.getRemoteAddr()); | |
162 super.doHead(req, resp); | |
163 } | |
164 | |
165 protected void doOptions(HttpServletRequest req, HttpServletResponse resp) | |
166 throws ServletException, IOException { | |
167 logger.debug("OPTIONS from "+req.getRemoteAddr()); | |
168 super.doOptions(req, resp); | |
169 } | |
170 | |
171 /** Service this request using the response. | |
557 | 172 * @param request |
173 * @param response | |
174 * @throws ServletException | |
175 */ | |
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176 public void processRequest(HttpServletRequest request, |
557 | 177 HttpServletResponse response) throws ServletException { |
487 | 178 |
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179 if (dlConfig == null) { |
557 | 180 logger.error("ERROR: No Configuration!"); |
181 throw new ServletException("NO VALID digilib CONFIGURATION!"); | |
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182 } |
502 | 183 |
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184 accountlog.debug("request: " + request.getQueryString()); |
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185 logger.debug("request: " + request.getQueryString()); |
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186 logger.debug("response:"+ response + " committed=" + response.isCommitted()); |
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187 final long startTime = System.currentTimeMillis(); |
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188 |
547 | 189 // parse request |
190 DigilibRequest dlRequest = new DigilibRequest(request); | |
191 // extract the job information | |
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192 final ImageJobDescription jobTicket = ImageJobDescription.getInstance(dlRequest, dlConfig); |
502 | 193 |
558 | 194 // type of error reporting |
195 ErrMsg errMsgType = ErrMsg.IMAGE; | |
196 if (dlRequest.hasOption("errtxt")) { | |
197 errMsgType = ErrMsg.TEXT; | |
198 } else if (dlRequest.hasOption("errcode")) { | |
199 errMsgType = ErrMsg.CODE; | |
200 } | |
201 | |
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202 try { |
547 | 203 /* |
204 * check if we can fast-track without scaling | |
205 */ | |
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206 ImageInput fileToLoad = (ImageInput) jobTicket.getInput(); |
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207 |
547 | 208 // check permissions |
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209 if (useAuthorization) { |
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210 // get a list of required roles (empty if no restrictions) |
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211 List<String> rolesRequired = authOp.rolesForPath( |
547 | 212 jobTicket.getFilePath(), request); |
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213 if (rolesRequired != null) { |
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214 authlog.debug("Role required: " + rolesRequired); |
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215 authlog.debug("User: " + request.getRemoteUser()); |
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216 // is the current request/user authorized? |
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217 if (!authOp.isRoleAuthorized(rolesRequired, request)) { |
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218 // send deny answer and abort |
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219 throw new AuthOpException(); |
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220 } |
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221 } |
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222 } |
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223 |
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224 // if requested, send image as a file |
547 | 225 if (sendFileAllowed && jobTicket.getSendAsFile()) { |
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226 String mt = null; |
547 | 227 if (jobTicket.hasOption("rawfile")) { |
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228 mt = "application/octet-stream"; |
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229 } |
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230 logger.debug("Sending RAW File as is."); |
572 | 231 ServletOps.sendFile(fileToLoad.getFile(), mt, null, response, logger); |
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232 logger.info("Done in " + (System.currentTimeMillis() - startTime) + "ms"); |
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233 return; |
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234 } |
487 | 235 |
547 | 236 // if possible, send the image without actually having to transform it |
237 if (! jobTicket.isTransformRequired()) { | |
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238 logger.debug("Sending File as is."); |
572 | 239 ServletOps.sendFile(fileToLoad.getFile(), null, null, response, logger); |
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240 logger.info("Done in " + (System.currentTimeMillis() - startTime) + "ms"); |
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241 return; |
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242 } |
181 | 243 |
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244 // check load of workers |
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245 if (imageJobCenter.isBusy()) { |
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246 logger.error("Servlet overloaded!"); |
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247 response.sendError(HttpServletResponse.SC_SERVICE_UNAVAILABLE); |
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248 return; |
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249 } |
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250 |
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251 // worker job is done asynchronously |
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252 AsyncContext asyncCtx = request.startAsync(request, response); |
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253 // create job |
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254 AsyncServletWorker job = new AsyncServletWorker(dlConfig, jobTicket, asyncCtx, errMsgType, startTime); |
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255 // submit job |
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256 imageJobCenter.submit(job); |
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257 // we're done for now |
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258 |
570 | 259 } catch (ImageOpException e) { |
260 logger.error(e.getClass() + ": " + e.getMessage()); | |
261 digilibError(errMsgType, Error.IMAGE, null, response); | |
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262 } catch (IOException e) { |
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263 logger.error(e.getClass() + ": " + e.getMessage()); |
558 | 264 digilibError(errMsgType, Error.FILE, null, response); |
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265 } catch (AuthOpException e) { |
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266 logger.error(e.getClass() + ": " + e.getMessage()); |
558 | 267 digilibError(errMsgType, Error.AUTH, null, response); |
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268 } |
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269 } |
298
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270 |
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271 /** |
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272 * Sends an error to the client as text or image. |
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273 * |
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274 * @param type |
558 | 275 * @param error |
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276 * @param msg |
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277 * @param response |
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278 */ |
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279 public static void digilibError(ErrMsg type, Error error, String msg, |
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280 HttpServletResponse response) { |
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281 try { |
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282 File img = null; |
557 | 283 int status = 0; |
558 | 284 if (error == Error.AUTH) { |
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285 if (msg == null) { |
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286 msg = "ERROR: Unauthorized access!"; |
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287 } |
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288 img = denyImgFile; |
557 | 289 status = HttpServletResponse.SC_FORBIDDEN; |
558 | 290 } else if (error == Error.FILE) { |
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291 if (msg == null) { |
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292 msg = "ERROR: Image file not found!"; |
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293 } |
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294 img = notfoundImgFile; |
557 | 295 status = HttpServletResponse.SC_NOT_FOUND; |
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296 } else { |
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297 if (msg == null) { |
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298 msg = "ERROR: Other image error!"; |
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299 } |
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300 img = errorImgFile; |
557 | 301 status = HttpServletResponse.SC_BAD_REQUEST; |
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302 } |
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303 if (response.isCommitted()) { |
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304 // response already committed |
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305 logger.warn("Response committed for error "+msg); |
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306 } |
558 | 307 if (type == ErrMsg.TEXT) { |
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308 ServletOps.htmlMessage(msg, response); |
558 | 309 } else if (type == ErrMsg.CODE) { |
557 | 310 response.sendError(status, msg); |
311 } else if (img != null) { | |
312 // default: image | |
572 | 313 ServletOps.sendFile(img, null, null, response, logger); |
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314 } |
570 | 315 } catch (Exception e) { |
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316 logger.error("Error sending error!", e); |
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317 } |
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318 |
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319 } |
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320 |
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321 public static String getVersion() { |
563 | 322 return version; |
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323 } |
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324 |
500 | 325 } |