authz-core/src/main/java/com/att/cssa/rserv/CachingFileAccess.java

   1 /*******************************************************************************\r
   2  * ============LICENSE_START====================================================\r
   3  * * org.onap.aaf\r
   4  * * ===========================================================================\r
   5  * * Copyright © 2017 AT&T Intellectual Property. All rights reserved.\r
   6  * * ===========================================================================\r
   7  * * Licensed under the Apache License, Version 2.0 (the "License");\r
   8  * * you may not use this file except in compliance with the License.\r
   9  * * You may obtain a copy of the License at\r
  10  * * \r
  11  *  *      http://www.apache.org/licenses/LICENSE-2.0\r
  12  * * \r
  13  *  * Unless required by applicable law or agreed to in writing, software\r
  14  * * distributed under the License is distributed on an "AS IS" BASIS,\r
  15  * * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r
  16  * * See the License for the specific language governing permissions and\r
  17  * * limitations under the License.\r
  18  * * ============LICENSE_END====================================================\r
  19  * *\r
  20  * * ECOMP is a trademark and service mark of AT&T Intellectual Property.\r
  21  * *\r
  22  ******************************************************************************/\r
  23 package com.att.cssa.rserv;\r
  24 \r
  25 \r
  26 import java.io.File;\r
  27 import java.io.FileInputStream;\r
  28 import java.io.FileNotFoundException;\r
  29 import java.io.FileOutputStream;\r
  30 import java.io.FileReader;\r
  31 import java.io.IOException;\r
  32 import java.io.OutputStream;\r
  33 import java.io.Writer;\r
  34 import java.nio.ByteBuffer;\r
  35 import java.nio.channels.FileChannel;\r
  36 import java.util.ArrayList;\r
  37 import java.util.Collections;\r
  38 import java.util.Date;\r
  39 import java.util.HashSet;\r
  40 import java.util.Map;\r
  41 import java.util.Map.Entry;\r
  42 import java.util.NavigableMap;\r
  43 import java.util.Set;\r
  44 import java.util.Timer;\r
  45 import java.util.TimerTask;\r
  46 import java.util.TreeMap;\r
  47 import java.util.concurrent.ConcurrentSkipListMap;\r
  48 \r
  49 import javax.servlet.http.HttpServletRequest;\r
  50 import javax.servlet.http.HttpServletResponse;\r
  51 \r
  52 import com.att.aft.dme2.internal.jetty.http.HttpStatus;\r
  53 import com.att.inno.env.Env;\r
  54 import com.att.inno.env.EnvJAXB;\r
  55 import com.att.inno.env.LogTarget;\r
  56 import com.att.inno.env.Store;\r
  57 import com.att.inno.env.TimeTaken;\r
  58 import com.att.inno.env.Trans;\r
  59 /*\r
  60  * CachingFileAccess\r
  61  * \r
  62  *  \r
  63  */\r
  64 public class CachingFileAccess<TRANS extends Trans> extends HttpCode<TRANS, Void> {\r
  65         public static void setEnv(Store store, String[] args) {\r
  66                 for(int i=0;i<args.length-1;i+=2) { // cover two parms required for each \r
  67                         if(CFA_WEB_DIR.equals(args[i])) {\r
  68                                 store.put(store.staticSlot(CFA_WEB_DIR), args[i+1]); \r
  69                         } else if(CFA_CACHE_CHECK_INTERVAL.equals(args[i])) {\r
  70                                 store.put(store.staticSlot(CFA_CACHE_CHECK_INTERVAL), Long.parseLong(args[i+1]));\r
  71                         } else if(CFA_MAX_SIZE.equals(args[i])) {\r
  72                                 store.put(store.staticSlot(CFA_MAX_SIZE), Integer.parseInt(args[i+1]));\r
  73                         }\r
  74                 }\r
  75         }\r
  76         \r
  77         private static String MAX_AGE = "max-age=3600"; // 1 hour Caching\r
  78         private final Map<String,String> typeMap;\r
  79         private final NavigableMap<String,Content> content;\r
  80         private final Set<String> attachOnly;\r
  81         private final static String WEB_DIR_DEFAULT = "theme";\r
  82         public final static String CFA_WEB_DIR = "CFA_WebPath";\r
  83         // when to re-validate from file\r
  84         // Re validating means comparing the Timestamp on the disk, and seeing it has changed.  Cache is not marked\r
  85         // dirty unless file has changed, but it still makes File IO, which for some kinds of cached data, i.e. \r
  86         // deployed GUI elements is unnecessary, and wastes time.\r
  87         // This parameter exists to cover the cases where data can be more volatile, so the user can choose how often the\r
  88         // File IO will be accessed, based on probability of change.  "0", of course, means, check every time.\r
  89         private final static String CFA_CACHE_CHECK_INTERVAL = "CFA_CheckIntervalMS";\r
  90         private final static String CFA_MAX_SIZE = "CFA_MaxSize"; // Cache size limit\r
  91         private final static String CFA_CLEAR_COMMAND = "CFA_ClearCommand";\r
  92 \r
  93         // Note: can be null without a problem, but included\r
  94         // to tie in with existing Logging.\r
  95         public LogTarget logT = null;\r
  96         public long checkInterval; // = 600000L; // only check if not hit in 10 mins by default\r
  97         public int maxItemSize; // = 512000; // max file 500k\r
  98         private Timer timer;\r
  99         private String web_path;\r
 100         // A command key is set in the Properties, preferably changed on deployment.\r
 101         // it is compared at the beginning of the path, and if so, it is assumed to issue certain commands\r
 102         // It's purpose is to protect, to some degree the command, even though it is HTTP, allowing \r
 103         // local batch files to, for instance, clear caches on resetting of files.\r
 104         private String clear_command;\r
 105         \r
 106         public CachingFileAccess(EnvJAXB env, String ... args) {\r
 107                 super(null,"Caching File Access");\r
 108                 setEnv(env,args);\r
 109                 content = new ConcurrentSkipListMap<String,Content>(); // multi-thread changes possible\r
 110 \r
 111                 attachOnly = new HashSet<String>();     // short, unchanged\r
 112 \r
 113                 typeMap = new TreeMap<String,String>(); // Structure unchanged after Construction\r
 114                 typeMap.put("ico","image/icon");\r
 115                 typeMap.put("html","text/html");\r
 116                 typeMap.put("css","text/css");\r
 117                 typeMap.put("js","text/javascript");\r
 118                 typeMap.put("txt","text/plain");\r
 119                 typeMap.put("xml","text/xml");\r
 120                 typeMap.put("xsd","text/xml");\r
 121                 attachOnly.add("xsd");\r
 122                 typeMap.put("crl", "application/x-pkcs7-crl");\r
 123                 typeMap.put("appcache","text/cache-manifest");\r
 124 \r
 125                 typeMap.put("json","text/json");\r
 126                 typeMap.put("ogg", "audio/ogg");\r
 127                 typeMap.put("jpg","image/jpeg");\r
 128                 typeMap.put("gif","image/gif");\r
 129                 typeMap.put("png","image/png");\r
 130                 typeMap.put("svg","image/svg+xml");\r
 131                 typeMap.put("jar","application/x-java-applet");\r
 132                 typeMap.put("jnlp", "application/x-java-jnlp-file");\r
 133                 typeMap.put("class", "application/java");\r
 134                 \r
 135                 timer = new Timer("Caching Cleanup",true);\r
 136                 timer.schedule(new Cleanup(content,500),60000,60000);\r
 137                 \r
 138                 // Property params\r
 139                 web_path = env.getProperty(CFA_WEB_DIR,WEB_DIR_DEFAULT);\r
 140                 Object obj;\r
 141                 obj = env.get(env.staticSlot(CFA_CACHE_CHECK_INTERVAL),600000L);  // Default is 10 mins\r
 142                 if(obj instanceof Long) {checkInterval=(Long)obj;\r
 143                 } else {checkInterval=Long.parseLong((String)obj);}\r
 144                 \r
 145                 obj = env.get(env.staticSlot(CFA_MAX_SIZE), 512000);    // Default is max file 500k\r
 146                 if(obj instanceof Integer) {maxItemSize=(Integer)obj;\r
 147                 } else {maxItemSize =Integer.parseInt((String)obj);}\r
 148                         \r
 149                 clear_command = env.getProperty(CFA_CLEAR_COMMAND,null);\r
 150         }\r
 151 \r
 152         \r
 153 \r
 154         @Override\r
 155         public void handle(TRANS trans, HttpServletRequest req, HttpServletResponse resp) throws IOException {\r
 156                 String key = pathParam(req, ":key");\r
 157                 if(key.equals(clear_command)) {\r
 158                         String cmd = pathParam(req,":cmd");\r
 159                         resp.setHeader("Content-type",typeMap.get("txt"));\r
 160                         if("clear".equals(cmd)) {\r
 161                                 content.clear();\r
 162                                 resp.setStatus(HttpStatus.OK_200);\r
 163                         } else {\r
 164                                 resp.setStatus(HttpStatus.BAD_REQUEST_400);\r
 165                         }\r
 166                         return;\r
 167                 }\r
 168                 Content c = load(logT , web_path,key, null, checkInterval);\r
 169                 if(c.attachmentOnly) {\r
 170                         resp.setHeader("Content-disposition", "attachment");\r
 171                 }\r
 172                 c.write(resp.getOutputStream());\r
 173                 c.setHeader(resp);\r
 174                 trans.checkpoint(req.getPathInfo());\r
 175         }\r
 176 \r
 177 \r
 178         public String webPath() {\r
 179                 return web_path;\r
 180         }\r
 181         \r
 182         /**\r
 183          * Reset the Cleanup size and interval\r
 184          * \r
 185          * The size and interval when started are 500 items (memory size unknown) checked every minute in a background thread.\r
 186          * \r
 187          * @param size\r
 188          * @param interval\r
 189          */\r
 190         public void cleanupParams(int size, long interval) {\r
 191                 timer.cancel();\r
 192                 timer.schedule(new Cleanup(content,size), interval, interval);\r
 193         }\r
 194         \r
 195 \r
 196         \r
 197         /**\r
 198          * Load a file, first checking cache\r
 199          * \r
 200          * \r
 201          * @param logTarget - logTarget can be null (won't log)\r
 202          * @param dataRoot - data root storage directory\r
 203          * @param key - relative File Path\r
 204          * @param mediaType - what kind of file is it.  If null, will check via file extension\r
 205          * @param timeCheck - "-1" will take system default - Otherwise, will compare "now" + timeCheck(Millis) before looking at File mod\r
 206          * @return\r
 207          * @throws IOException\r
 208          */\r
 209         public Content load(LogTarget logTarget, String dataRoot, String key, String mediaType, long _timeCheck) throws IOException {\r
 210             long timeCheck = _timeCheck;\r
 211                 if(timeCheck<0) {\r
 212                         timeCheck=checkInterval; // if time < 0, then use default\r
 213                 }\r
 214                 String fileName = dataRoot + '/' + key;\r
 215                 Content c = content.get(key);\r
 216                 long systime = System.currentTimeMillis(); \r
 217                 File f=null;\r
 218                 if(c!=null) {\r
 219                         // Don't check every hit... only after certain time value\r
 220                         if(c.date < systime + timeCheck) {\r
 221                                 f = new File(fileName);\r
 222                                 if(f.lastModified()>c.date) {\r
 223                                         c=null;\r
 224                                 }\r
 225                         }\r
 226                 }\r
 227                 if(c==null) {   \r
 228                         if(logTarget!=null) {\r
 229                                 logTarget.log("File Read: ",key);\r
 230                         }\r
 231                         \r
 232                         if(f==null){\r
 233                                 f = new File(fileName);\r
 234                         }\r
 235 \r
 236                         boolean cacheMe;\r
 237                         if(f.exists()) {\r
 238                                 if(f.length() > maxItemSize) {\r
 239                                         c = new DirectFileContent(f);\r
 240                                         cacheMe = false;\r
 241                                 } else {\r
 242                                         c = new CachedContent(f);\r
 243                                         cacheMe = checkInterval>0;\r
 244                                 }\r
 245                                 \r
 246                                 if(mediaType==null) { // determine from file Ending\r
 247                                         int idx = key.lastIndexOf('.');\r
 248                                         String subkey = key.substring(++idx);\r
 249                                         if((c.contentType = idx<0?null:typeMap.get(subkey))==null) {\r
 250                                                 // if nothing else, just set to default type...\r
 251                                                 c.contentType = "application/octet-stream";\r
 252                                         }\r
 253                                         c.attachmentOnly = attachOnly.contains(subkey);\r
 254                                 } else {\r
 255                                         c.contentType=mediaType;\r
 256                                         c.attachmentOnly = false;\r
 257                                 }\r
 258                                 \r
 259                                 c.date = f.lastModified();\r
 260                                 \r
 261                                 if(cacheMe) {\r
 262                                         content.put(key, c);\r
 263                                 }\r
 264                         } else {\r
 265                                 c=NULL;\r
 266                         }\r
 267                 } else {\r
 268                         if(logTarget!=null)logTarget.log("Cache Read: ",key);\r
 269                 }\r
 270 \r
 271                 // refresh hit time\r
 272                 c.access = systime;\r
 273                 return c;\r
 274         }\r
 275         \r
 276         public Content loadOrDefault(Trans trans, String targetDir, String targetFileName, String sourcePath, String mediaType) throws IOException {\r
 277                 try {\r
 278                         return load(trans.info(),targetDir,targetFileName,mediaType,0);\r
 279                 } catch(FileNotFoundException e) {\r
 280                         String targetPath = targetDir + '/' + targetFileName;\r
 281                         TimeTaken tt = trans.start("File doesn't exist; copy " + sourcePath + " to " + targetPath, Env.SUB);\r
 282                         try {\r
 283                                 FileInputStream sourceFIS = new FileInputStream(sourcePath);\r
 284                                 FileChannel sourceFC = sourceFIS.getChannel();\r
 285                                 File targetFile = new File(targetPath);\r
 286                                 targetFile.getParentFile().mkdirs(); // ensure directory exists\r
 287                                 FileOutputStream targetFOS = new FileOutputStream(targetFile);\r
 288                                 try {\r
 289                                         ByteBuffer bb = ByteBuffer.allocate((int)sourceFC.size());\r
 290                                         sourceFC.read(bb);\r
 291                                         bb.flip();  // ready for reading\r
 292                                         targetFOS.getChannel().write(bb);\r
 293                                 } finally {\r
 294                                         sourceFIS.close();\r
 295                                         targetFOS.close();\r
 296                                 }\r
 297                         } finally {\r
 298                                 tt.done();\r
 299                         }\r
 300                         return load(trans.info(),targetDir,targetFileName,mediaType,0);\r
 301                 }\r
 302         }\r
 303 \r
 304         public void invalidate(String key) {\r
 305                 content.remove(key);\r
 306         }\r
 307         \r
 308         private static final Content NULL=new Content() {\r
 309                 \r
 310                 @Override\r
 311                 public void setHeader(HttpServletResponse resp) {\r
 312                         resp.setStatus(HttpStatus.NOT_FOUND_404);\r
 313                         resp.setHeader("Content-type","text/plain");\r
 314                 }\r
 315 \r
 316                 @Override\r
 317                 public void write(Writer writer) throws IOException {\r
 318                 }\r
 319 \r
 320                 @Override\r
 321                 public void write(OutputStream os) throws IOException {\r
 322                 }\r
 323                 \r
 324         };\r
 325 \r
 326         private static abstract class Content {\r
 327                 private long date;   // date of the actual artifact (i.e. File modified date)\r
 328                 private long access; // last accessed\r
 329                 \r
 330                 protected String  contentType;\r
 331                 protected boolean attachmentOnly;\r
 332                 \r
 333                 public void setHeader(HttpServletResponse resp) {\r
 334                         resp.setStatus(HttpStatus.OK_200);\r
 335                         resp.setHeader("Content-type",contentType);\r
 336                         resp.setHeader("Cache-Control", MAX_AGE);\r
 337                 }\r
 338                 \r
 339                 public abstract void write(Writer writer) throws IOException;\r
 340                 public abstract void write(OutputStream os) throws IOException;\r
 341 \r
 342         }\r
 343 \r
 344         private static class DirectFileContent extends Content {\r
 345                 private File file; \r
 346                 public DirectFileContent(File f) {\r
 347                         file = f;\r
 348                 }\r
 349                 \r
 350                 public String toString() {\r
 351                         return file.getName();\r
 352                 }\r
 353                 \r
 354                 public void write(Writer writer) throws IOException {\r
 355                         FileReader fr = new FileReader(file);\r
 356                         char[] buff = new char[1024];\r
 357                         try {\r
 358                                 int read;\r
 359                                 while((read = fr.read(buff,0,1024))>=0) {\r
 360                                         writer.write(buff,0,read);\r
 361                                 }\r
 362                         } finally {\r
 363                                 fr.close();\r
 364                         }\r
 365                 }\r
 366 \r
 367                 public void write(OutputStream os) throws IOException {\r
 368                         FileInputStream fis = new FileInputStream(file);\r
 369                         byte[] buff = new byte[1024];\r
 370                         try {\r
 371                                 int read;\r
 372                                 while((read = fis.read(buff,0,1024))>=0) {\r
 373                                         os.write(buff,0,read);\r
 374                                 }\r
 375                         } finally {\r
 376                                 fis.close();\r
 377                         }\r
 378                 }\r
 379 \r
 380         }\r
 381         private static class CachedContent extends Content {\r
 382                 private byte[] data;\r
 383                 private int end;\r
 384                 private char[] cdata; \r
 385                 \r
 386                 public CachedContent(File f) throws IOException {\r
 387                         // Read and Cache\r
 388                         ByteBuffer bb = ByteBuffer.allocate((int)f.length());\r
 389                         FileInputStream fis = new FileInputStream(f);\r
 390                         try {\r
 391                                 fis.getChannel().read(bb);\r
 392                         } finally {\r
 393                                 fis.close();\r
 394                         }\r
 395 \r
 396                         data = bb.array();\r
 397                         end = bb.position();\r
 398                         cdata=null;\r
 399                 }\r
 400                 \r
 401                 public String toString() {\r
 402                         return data.toString();\r
 403                 }\r
 404                 \r
 405                 public void write(Writer writer) throws IOException {\r
 406                         synchronized(this) {\r
 407                                 // do the String Transformation once, and only if actually used\r
 408                                 if(cdata==null) {\r
 409                                         cdata = new char[end];\r
 410                                         new String(data).getChars(0, end, cdata, 0);\r
 411                                 }\r
 412                         }\r
 413                         writer.write(cdata,0,end);\r
 414                 }\r
 415                 public void write(OutputStream os) throws IOException {\r
 416                         os.write(data,0,end);\r
 417                 }\r
 418 \r
 419         }\r
 420 \r
 421         public void setEnv(LogTarget env) {\r
 422                 logT = env;\r
 423         }\r
 424 \r
 425         /**\r
 426          * Cleanup thread to remove older items if max Cache is reached.\r
 427          *\r
 428          */\r
 429         private static class Cleanup extends TimerTask {\r
 430                 private int maxSize;\r
 431                 private NavigableMap<String, Content> content;\r
 432                 \r
 433                 public Cleanup(NavigableMap<String, Content> content, int size) {\r
 434                         maxSize = size;\r
 435                         this.content = content;\r
 436                 }\r
 437                 \r
 438                 private class Comp implements Comparable<Comp> {\r
 439                         public Map.Entry<String, Content> entry;\r
 440                         \r
 441                         public Comp(Map.Entry<String, Content> en) {\r
 442                                 entry = en;\r
 443                         }\r
 444                         \r
 445                         @Override\r
 446                         public int compareTo(Comp o) {\r
 447                                 return (int)(entry.getValue().access-o.entry.getValue().access);\r
 448                         }\r
 449                         \r
 450                 }\r
 451                 @SuppressWarnings("unchecked")\r
 452                 @Override\r
 453                 public void run() {\r
 454                         int size = content.size();\r
 455                         if(size>maxSize) {\r
 456                                 ArrayList<Comp> scont = new ArrayList<Comp>(size);\r
 457                                 Object[] entries = content.entrySet().toArray();\r
 458                                 for(int i=0;i<size;++i) {\r
 459                                         scont.add(i, new Comp((Map.Entry<String,Content>)entries[i]));\r
 460                                 }\r
 461                                 Collections.sort(scont);\r
 462                                 int end = size - ((maxSize/4)*3); // reduce to 3/4 of max size\r
 463                                 System.out.println("------ Cleanup Cycle ------ " + new Date().toString() + " -------");\r
 464                                 for(int i=0;i<end;++i) {\r
 465                                         Entry<String, Content> entry = scont.get(i).entry;\r
 466                                         content.remove(entry.getKey());\r
 467                                         System.out.println("removed Cache Item " + entry.getKey() + "/" + new Date(entry.getValue().access).toString());\r
 468                                 }\r
 469                                 for(int i=end;i<size;++i) {\r
 470                                         Entry<String, Content> entry = scont.get(i).entry;\r
 471                                         System.out.println("remaining Cache Item " + entry.getKey() + "/" + new Date(entry.getValue().access).toString());\r
 472                                 }\r
 473                         }\r
 474                 }\r
 475         }\r
 476 }\r