diff options
Diffstat (limited to 'tdehtml/java/org/kde/kjas/server/KJASAppletClassLoader.java')
| -rw-r--r-- | tdehtml/java/org/kde/kjas/server/KJASAppletClassLoader.java | 360 |
1 files changed, 360 insertions, 0 deletions
diff --git a/tdehtml/java/org/kde/kjas/server/KJASAppletClassLoader.java b/tdehtml/java/org/kde/kjas/server/KJASAppletClassLoader.java new file mode 100644 index 000000000..c6defa848 --- /dev/null +++ b/tdehtml/java/org/kde/kjas/server/KJASAppletClassLoader.java @@ -0,0 +1,360 @@ +package org.kde.kjas.server; + +import java.net.*; +import java.io.*; +import java.util.*; +import java.util.zip.*; +import java.util.jar.*; +import java.security.*; +/** + * ClassLoader used to download and instantiate Applets. + * <P> + * NOTE: The class loader extends Java 1.2 specific class. + */ +public final class KJASAppletClassLoader + extends URLClassLoader +{ + private static Hashtable loaders = new Hashtable(); + + public static synchronized void removeLoaders() + { + loaders.clear(); + } + + public static synchronized KJASAppletClassLoader getLoader( String docBase, String codeBase, String archives ) + { + SecurityManager security = System.getSecurityManager(); + if (security != null) { + security.checkCreateClassLoader(); + } + URL docBaseURL; + KJASAppletClassLoader loader = null; + try + { + docBaseURL = new URL( docBase ); + + URL codeBaseURL = getCodeBaseURL( docBaseURL, codeBase ); + String key = codeBaseURL.toString(); + if (archives != null) + key += archives; + + Main.debug( "CL: getLoader: key = " + key ); + + loader = (KJASAppletClassLoader) loaders.get( key ); + if( loader == null ) + { + URL [] urlList = {}; + loader = new KJASAppletClassLoader( urlList, docBaseURL, codeBaseURL); + loaders.put( key, loader ); + } + else + { + Main.debug( "CL: reusing classloader" ); + } + } catch( MalformedURLException e ) { Main.kjas_err( "bad DocBase URL", e ); } + return loader; + } + + public static URL getCodeBaseURL( URL docBaseURL, String codeBase ) + { + URL codeBaseURL = null; + try + { + //first determine what the real codeBase is: 3 cases + //#1. codeBase is absolute URL- use that + //#2. codeBase is relative to docBase, create url from those + //#3. last resort, use docBase as the codeBase + if(codeBase != null) + { + //we need to do this since codeBase should be a directory + if( !codeBase.endsWith("/") ) + codeBase = codeBase + "/"; + + try + { + codeBaseURL = new URL( codeBase ); + } catch( MalformedURLException mue ) + { + try + { + codeBaseURL = new URL( docBaseURL, codeBase ); + } catch( MalformedURLException mue2 ) {} + } + } + + if(codeBaseURL == null) + { + //fall back to docBase but fix it up... + String file = docBaseURL.getFile(); + if( file == null || (file.length() == 0) ) + codeBaseURL = docBaseURL; + else if( file.endsWith( "/" ) ) + codeBaseURL = docBaseURL; + else + { + //delete up to the ending '/' + String urlString = docBaseURL.toString(); + int dot_index = urlString.lastIndexOf( '/' ); + String newfile = urlString.substring( 0, dot_index+1 ); + codeBaseURL = new URL( newfile ); + } + } + }catch( Exception e ) { Main.kjas_err( "CL: exception ", e ); } + return codeBaseURL; + } + + public static KJASAppletClassLoader getLoader( String key ) + { + SecurityManager security = System.getSecurityManager(); + if (security != null) { + security.checkCreateClassLoader(); + } + if( loaders.containsKey( key ) ) + return (KJASAppletClassLoader) loaders.get( key ); + + return null; + } + + /********************************************************************************* + ****************** KJASAppletClassLoader Implementation ************************* + **********************************************************************************/ + private URL docBaseURL; + private URL codeBaseURL; + private Vector archives; + private String dbgID; + private static int globalId = 0; + private int myId = 0; + private Vector statusListeners = new Vector(); + private AccessControlContext acc; + // a mapping JS referenced Java objects + private Hashtable jsReferencedObjects = new Hashtable(); + final static RuntimePermission kjas_access = new RuntimePermission("accessClassInPackage.org.kde.kjas.server"); + + public KJASAppletClassLoader( URL[] urlList, URL _docBaseURL, URL _codeBaseURL) + { + super(urlList); + acc = AccessController.getContext(); + synchronized(KJASAppletClassLoader.class) { + myId = ++globalId; + } + docBaseURL = _docBaseURL; + codeBaseURL = _codeBaseURL; + archives = new Vector(); + + dbgID = "CL-" + myId + "(" + codeBaseURL.toString() + "): "; + } + + protected void addURL(URL url) { + Main.debug(this + " add URL: " + url); + super.addURL(url); + } + + public void addStatusListener(StatusListener lsnr) { + statusListeners.add(lsnr); + } + public void removeStatusListener(StatusListener lsnr) { + statusListeners.remove(lsnr); + } + public void showStatus(String msg) { + Enumeration en = statusListeners.elements(); + while (en.hasMoreElements()) { + StatusListener lsnr = (StatusListener)en.nextElement(); + lsnr.showStatus(msg); + } + } + + public void paramsDone() { + // simply builds up the search path + // put the archives first because they are + // cached. + for( int i = 0; i < archives.size(); ++i ) { + String jar = (String)archives.elementAt( i ); + try { + URL jarURL = new URL(codeBaseURL, jar); + addURL(jarURL); + Main.debug("added archive URL \"" + jarURL + "\" to KJASAppletClassLoader"); + } catch (MalformedURLException e) { + Main.kjas_err("Could not construct URL for jar file: " + codeBaseURL + " + " + jar, e); + } + } + // finally add code base url and docbase url + addURL(codeBaseURL); + + // the docBaseURL has to be fixed. + // strip file part from end otherwise this + // will be interpreted as an archive + // (should this perhaps be done generally ??) + String dbs = docBaseURL.toString(); + int idx = dbs.lastIndexOf("/"); + if (idx > 0) { + dbs = dbs.substring(0, idx+1); + } + URL docDirURL = null; + try { + docDirURL = new URL(dbs); + } catch (MalformedURLException e) { + Main.debug("Could not make a new URL from docBaseURL=" + docBaseURL); + } + if (docDirURL != null && !codeBaseURL.equals(docDirURL)) { + addURL(docDirURL); + } + } + + void addArchiveName( String jarname ) + { + if( !archives.contains( jarname ) ) + { + archives.add( jarname ); + } + } + + + public URL getDocBase() + { + return docBaseURL; + } + + public URL getCodeBase() + { + return codeBaseURL; + } + + Hashtable getJSReferencedObjects() { + return jsReferencedObjects; + } + /*************************************************************************** + **** Class Loading Methods + **************************************************************************/ + public synchronized Class findClass( String name ) throws ClassNotFoundException + { + Class rval = null; + //check the loaded classes + rval = findLoadedClass( name ); + if( rval == null ) { + try { + rval = super.findClass(name); + } catch (ClassFormatError cfe) { + Main.debug(name + ": Catched " + cfe + ". Trying to repair..."); + rval = loadFixedClass( name ); + } catch (Exception ex) { + Main.debug("findClass " + name + " " + ex.getMessage()); + } + } + if (rval == null) { + throw new ClassNotFoundException("Class: " + name); + } + return rval; + } + public Class loadClass(String name) throws ClassNotFoundException { + if (name.startsWith("org.kde.kjas.server")) { + SecurityManager sec = System.getSecurityManager(); + if (sec != null) + sec.checkPermission(kjas_access); + } + return super.loadClass(name); + } + private Hashtable loadedClasses = new Hashtable(); + + private synchronized final Class loadFixedClass(String name) throws ClassNotFoundException { + final String fileName = name.replace('.', '/') + ".class"; + try { + // try to get the class as resource + final URL u = getResource(fileName); + Main.debug(dbgID + name + ": got URL: " + u); + if (u == null) { + throw new ClassNotFoundException(fileName + ": invalid resource URL."); + } + java.security.cert.Certificate[] certs = {}; // FIXME + CodeSource cs = new CodeSource(u, certs); + InputStream instream = (InputStream)AccessController.doPrivileged( + new PrivilegedAction() { + public Object run() { + try { + return u.openStream(); + } catch (IOException ioe) { + ioe.printStackTrace(); + return null; + } + } + }, acc + ); + if (instream == null) { + throw new ClassNotFoundException(name + ": could not be loaded."); + } + ByteArrayOutputStream byteStream = new ByteArrayOutputStream(); + int cnt; + int total = 0; + int bufSize = 1024; + byte [] buffer = new byte[bufSize]; + while ((cnt = instream.read(buffer, 0, bufSize)) > 0) { + total += cnt; + byteStream.write(buffer, 0, cnt); + } + Main.debug(dbgID + name + ": " + total + " bytes"); + + Class cl = fixAndDefineClass(name, byteStream.toByteArray(), 0, total, cs); + if (cl != null) { + loadedClasses.put(name, cl); + } + return cl; + + } catch (Throwable e) { + e.printStackTrace(); + throw new ClassNotFoundException("triggered by " + e); + } + } + + public URL findResource( String name) + { + Main.debug( dbgID + "findResource, name = " + name ); + String displayName = name; + try { + URL u = new URL(name); + String filename = u.getFile(); + if (filename != null && filename.length() > 0) { + displayName = filename; + } + } catch (Throwable e) { + } + showStatus("Loading: " + displayName); + URL url = super.findResource( name ); + Main.debug("findResource for " + name + " returns " + url); + return url; + } + + protected PermissionCollection getPermissions(CodeSource cs) { + Main.debug(dbgID + " getPermissions(" + cs + ")"); + PermissionCollection permissions = super.getPermissions(cs); + Enumeration perms_enum = permissions.elements(); + while (perms_enum.hasMoreElements()) { + Main.debug(this + " Permission: " + perms_enum.nextElement()); + } + return permissions; + } + + + /** + * define the class <b>name</b>. If <b>name</b> is broken, try to fix it. + */ + private final Class fixAndDefineClass( + String name, + byte[] b, + int off, + int len, + CodeSource cs) throws ClassFormatError + { + KJASBrokenClassFixer fixer = new KJASBrokenClassFixer(); + if (fixer.process(b, off, len)) { + Main.debug(name + " fixed"); + } else { + Main.info(name + " could not be fixed"); + } + return defineClass(name, + fixer.getProcessedData(), + fixer.getProcessedDataOffset(), + fixer.getProcessedDataLength(), + cs); + } + + +} |