/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package javax.mail;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.net.InetAddress;
import java.net.URL;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.StringTokenizer;
import java.util.WeakHashMap;
import org.apache.geronimo.osgi.locator.ProviderLocator;
import org.apache.geronimo.mail.MailProviderRegistry;
/**
* OK, so we have a final class in the API with a heck of a lot of implementation required...
* let‘s try and figure out what it is meant to do.
* <p/>
* It is supposed to collect together properties and defaults so that they can be
* shared by multiple applications on a desktop; with process isolation and no
* real concept of shared memory, this seems challenging. These properties and
* defaults rely on system properties, making management in a app server harder,
* and on resources loaded from "mail.jar" which may lead to skew between
* differnet independent implementations of this API.
*
* @version $Rev: 924365 $ $Date: 2010-03-17 12:52:03 -0400 (Wed, 17 Mar 2010) $
*/
public final class Session {
private static final Class[] PARAM_TYPES = {Session.class, URLName.class};
private static final WeakHashMap addressMapsByClassLoader = new WeakHashMap();
private static Session DEFAULT_SESSION;
private Map passwordAuthentications = new HashMap();
private final Properties properties;
private final Authenticator authenticator;
private boolean debug;
private PrintStream debugOut = System.out;
private static final WeakHashMap providersByClassLoader = new WeakHashMap();
/**
* No public constrcutor allowed.
*/
private Session(Properties properties, Authenticator authenticator) {
this.properties = properties;
this.authenticator = authenticator;
debug = Boolean.valueOf(properties.getProperty("mail.debug")).booleanValue();
}
/**
* Create a new session initialized with the supplied properties which uses the supplied authenticator.
* Clients should ensure the properties listed in Appendix A of the JavaMail specification are
* set as the defaults are unlikey to work in most scenarios; particular attention should be given
* to:
* <ul>
* <li>mail.store.protocol</li>
* <li>mail.transport.protocol</li>
* <li>mail.host</li>
* <li>mail.user</li>
* <li>mail.from</li>
* </ul>
*
* @param properties the session properties
* @param authenticator an authenticator for callbacks to the user
* @return a new session
*/
public static Session getInstance(Properties properties, Authenticator authenticator) {
// if we have a properties bundle, we need a copy of the provided one
if (properties != null) {
properties = (Properties)properties.clone();
}
return new Session(properties, authenticator);
}
/**
* Create a new session initialized with the supplied properties with no authenticator.
*
* @param properties the session properties
* @return a new session
* @see #getInstance(java.util.Properties, Authenticator)
*/
public static Session getInstance(Properties properties) {
return getInstance(properties, null);
}
/**
* Get the "default" instance assuming no authenticator is required.
*
* @param properties the session properties
* @return if "default" session
* @throws SecurityException if the does not have permission to access the default session
*/
public synchronized static Session getDefaultInstance(Properties properties) {
return getDefaultInstance(properties, null);
}
/**
* Get the "default" session.
* If there is not current "default", a new Session is created and installed as the default.
*
* @param properties
* @param authenticator
* @return if "default" session
* @throws SecurityException if the does not have permission to access the default session
*/
public synchronized static Session getDefaultInstance(Properties properties, Authenticator authenticator) {
if (DEFAULT_SESSION == null) {
DEFAULT_SESSION = getInstance(properties, authenticator);
} else {
if (authenticator != DEFAULT_SESSION.authenticator) {
if (authenticator == null || DEFAULT_SESSION.authenticator == null || authenticator.getClass().getClassLoader() != DEFAULT_SESSION.authenticator.getClass().getClassLoader()) {
throw new SecurityException();
}
}
// todo we should check with the SecurityManager here as well
}
return DEFAULT_SESSION;
}
/**
* Enable debugging for this session.
* Debugging can also be enabled by setting the "mail.debug" property to true when
* the session is being created.
*
* @param debug the debug setting
*/
public void setDebug(boolean debug) {
this.debug = debug;
}
/**
* Get the debug setting for this session.
*
* @return the debug setting
*/
public boolean getDebug() {
return debug;
}
/**
* Set the output stream where debug information should be sent.
* If set to null, System.out will be used.
*
* @param out the stream to write debug information to
*/
public void setDebugOut(PrintStream out) {
debugOut = out == null ? System.out : out;
}
/**
* Return the debug output stream.
*
* @return the debug output stream
*/
public PrintStream getDebugOut() {
return debugOut;
}
/**
* Return the list of providers available to this application.
* This method searches for providers that are defined in the javamail.providers
* and javamail.default.providers resources available through the current context
* classloader, or if that is not available, the classloader that loaded this class.
* <p/>
* As searching for providers is potentially expensive, this implementation maintains
* a WeakHashMap of providers indexed by ClassLoader.
*
* @return an array of providers
*/
public Provider[] getProviders() {
ProviderInfo info = getProviderInfo();
return (Provider[]) info.all.toArray(new Provider[info.all.size()]);
}
/**
* Return the provider for a specific protocol.
* This implementation initially looks in the Session properties for an property with the name
* "mail.<protocol>.class"; if found it attempts to create an instance of the class named in that
* property throwing a NoSuchProviderException if the class cannot be loaded.
* If this property is not found, it searches the providers returned by {@link #getProviders()}
* for a entry for the specified protocol.
*
* @param protocol the protocol to get a provider for
* @return a provider for that protocol
* @throws NoSuchProviderException
*/
public Provider getProvider(String protocol) throws NoSuchProviderException {
ProviderInfo info = getProviderInfo();
Provider provider = null;
String providerName = properties.getProperty("mail." + protocol + ".class");
if (providerName != null) {
provider = (Provider) info.byClassName.get(providerName);
if (debug) {
writeDebug("DEBUG: new provider loaded: " + provider.toString());
}
}
// if not able to locate this by class name, just grab a registered protocol.
if (provider == null) {
provider = (Provider) info.byProtocol.get(protocol);
}
if (provider == null) {
throw new NoSuchProviderException("Unable to locate provider for protocol: " + protocol);
}
if (debug) {
writeDebug("DEBUG: getProvider() returning provider " + provider.toString());
}
return provider;
}
/**
* Make the supplied Provider the default for its protocol.
*
* @param provider the new default Provider
* @throws NoSuchProviderException
*/
public void setProvider(Provider provider) throws NoSuchProviderException {
ProviderInfo info = getProviderInfo();
info.byProtocol.put(provider.getProtocol(), provider);
}
/**
* Return a Store for the default protocol defined by the mail.store.protocol property.
*
* @return the store for the default protocol
* @throws NoSuchProviderException
*/
public Store getStore() throws NoSuchProviderException {
String protocol = properties.getProperty("mail.store.protocol");
if (protocol == null) {
throw new NoSuchProviderException("mail.store.protocol property is not set");
}
return getStore(protocol);
}
/**
* Return a Store for the specified protocol.
*
* @param protocol the protocol to get a Store for
* @return a Store
* @throws NoSuchProviderException if no provider is defined for the specified protocol
*/
public Store getStore(String protocol) throws NoSuchProviderException {
Provider provider = getProvider(protocol);
return getStore(provider);
}
/**
* Return a Store for the protocol specified in the given URL
*
* @param url the URL of the Store
* @return a Store
* @throws NoSuchProviderException if no provider is defined for the specified protocol
*/
public Store getStore(URLName url) throws NoSuchProviderException {
return (Store) getService(getProvider(url.getProtocol()), url);
}
/**
* Return the Store specified by the given provider.
*
* @param provider the provider to create from
* @return a Store
* @throws NoSuchProviderException if there was a problem creating the Store
*/
public Store getStore(Provider provider) throws NoSuchProviderException {
if (Provider.Type.STORE != provider.getType()) {
throw new NoSuchProviderException("Not a Store Provider: " + provider);
}
return (Store) getService(provider, null);
}
/**
* Return a closed folder for the supplied URLName, or null if it cannot be obtained.
* <p/>
* The scheme portion of the URL is used to locate the Provider and create the Store;
* the returned Store is then used to obtain the folder.
*
* @param name the location of the folder
* @return the requested folder, or null if it is unavailable
* @throws NoSuchProviderException if there is no provider
* @throws MessagingException if there was a problem accessing the Store
*/
public Folder getFolder(URLName name) throws MessagingException {
Store store = getStore(name);
return store.getFolder(name);
}
/**
* Return a Transport for the default protocol specified by the
* <code>mail.transport.protocol</code> property.
*
* @return a Transport
* @throws NoSuchProviderException
*/
public Transport getTransport() throws NoSuchProviderException {
String protocol = properties.getProperty("mail.transport.protocol");
if (protocol == null) {
throw new NoSuchProviderException("mail.transport.protocol property is not set");
}
return getTransport(protocol);
}
/**
* Return a Transport for the specified protocol.
*
* @param protocol the protocol to use
* @return a Transport
* @throws NoSuchProviderException
*/
public Transport getTransport(String protocol) throws NoSuchProviderException {
Provider provider = getProvider(protocol);
return getTransport(provider);
}
/**
* Return a transport for the protocol specified in the URL.
*
* @param name the URL whose scheme specifies the protocol
* @return a Transport
* @throws NoSuchProviderException
*/
public Transport getTransport(URLName name) throws NoSuchProviderException {
return (Transport) getService(getProvider(name.getProtocol()), name);
}
/**
* Return a transport for the protocol associated with the type of this address.
*
* @param address the address we are trying to deliver to
* @return a Transport
* @throws NoSuchProviderException
*/
public Transport getTransport(Address address) throws NoSuchProviderException {
String type = address.getType();
// load the address map from the resource files.
Map addressMap = getAddressMap();
String protocolName = (String)addressMap.get(type);
if (protocolName == null) {
throw new NoSuchProviderException("No provider for address type " + type);
}
return getTransport(protocolName);
}
/**
* Return the Transport specified by a Provider
*
* @param provider the defining Provider
* @return a Transport
* @throws NoSuchProviderException
*/
public Transport getTransport(Provider provider) throws NoSuchProviderException {
return (Transport) getService(provider, null);
}
/**
* Set the password authentication associated with a URL.
*
* @param name the url
* @param authenticator the authenticator
*/
public void setPasswordAuthentication(URLName name, PasswordAuthentication authenticator) {
if (authenticator == null) {
passwordAuthentications.remove(name);
} else {
passwordAuthentications.put(name, authenticator);
}
}
/**
* Get the password authentication associated with a URL
*
* @param name the URL
* @return any authenticator for that url, or null if none
*/
public PasswordAuthentication getPasswordAuthentication(URLName name) {
return (PasswordAuthentication) passwordAuthentications.get(name);
}
/**
* Call back to the application supplied authenticator to get the needed username add password.
*
* @param host the host we are trying to connect to, may be null
* @param port the port on that host
* @param protocol the protocol trying to be used
* @param prompt a String to show as part of the prompt, may be null
* @param defaultUserName the default username, may be null
* @return the authentication information collected by the authenticator; may be null
*/
public PasswordAuthentication requestPasswordAuthentication(InetAddress host, int port, String protocol, String prompt, String defaultUserName) {
if (authenticator == null) {
return null;
}
return authenticator.authenticate(host, port, protocol, prompt, defaultUserName);
}
/**
* Return the properties object for this Session; this is a live collection.
*
* @return the properties for the Session
*/
public Properties getProperties() {
return properties;
}
/**
* Return the specified property.
*
* @param property the property to get
* @return its value, or null if not present
*/
public String getProperty(String property) {
return getProperties().getProperty(property);
}
/**
* Add a provider to the Session managed provider list.
*
* @param provider The new provider to add.
*/
public synchronized void addProvider(Provider provider) {
ProviderInfo info = getProviderInfo();
info.addProvider(provider);
}
/**
* Add a mapping between an address type and a protocol used
* to process that address type.
*
* @param addressType
* The address type identifier.
* @param protocol The protocol name mapping.
*/
public void setProtocolForAddress(String addressType, String protocol) {
Map addressMap = getAddressMap();
// no protocol specified is a removal
if (protocol == null) {
addressMap.remove(addressType);
}
else {
addressMap.put(addressType, protocol);
}
}
private Service getService(Provider provider, URLName name) throws NoSuchProviderException {
try {
if (name == null) {
name = new URLName(provider.getProtocol(), null, -1, null, null, null);
}
ClassLoader cl = getClassLoader();
Class clazz = null;
try {
clazz = ProviderLocator.loadClass(provider.getClassName(), this.getClass(), cl);
} catch (ClassNotFoundException e) {
throw (NoSuchProviderException) new NoSuchProviderException("Unable to load class for provider: " + provider).initCause(e);
}
Constructor ctr = clazz.getConstructor(PARAM_TYPES);
return(Service) ctr.newInstance(new Object[]{this, name});
} catch (NoSuchMethodException e) {
throw (NoSuchProviderException) new NoSuchProviderException("Provider class does not have a constructor(Session, URLName): " + provider).initCause(e);
} catch (InstantiationException e) {
throw (NoSuchProviderException) new NoSuchProviderException("Unable to instantiate provider class: " + provider).initCause(e);
} catch (IllegalAccessException e) {
throw (NoSuchProviderException) new NoSuchProviderException("Unable to instantiate provider class: " + provider).initCause(e);
} catch (InvocationTargetException e) {
throw (NoSuchProviderException) new NoSuchProviderException("Exception from constructor of provider class: " + provider).initCause(e.getCause());
}
}
private ProviderInfo getProviderInfo() {
ClassLoader cl = getClassLoader();
synchronized (providersByClassLoader) {
ProviderInfo info = (ProviderInfo) providersByClassLoader.get(cl);
if (info == null) {
info = loadProviders(cl);
}
return info;
}
}
private Map getAddressMap() {
ClassLoader cl = getClassLoader();
Map addressMap = (Map)addressMapsByClassLoader.get(cl);
if (addressMap == null) {
addressMap = loadAddressMap(cl);
}
return addressMap;
}
/**
* Resolve a class loader used to resolve context resources. The
* class loader used is either a current thread context class
* loader (if set), the class loader used to load an authenticator
* we‘ve been initialized with, or the class loader used to load
* this class instance (which may be a subclass of Session).
*
* @return The class loader used to load resources.
*/
private ClassLoader getClassLoader() {
ClassLoader cl = Thread.currentThread().getContextClassLoader();
if (cl == null) {
if (authenticator != null) {
cl = authenticator.getClass().getClassLoader();
}
else {
cl = this.getClass().getClassLoader();
}
}
return cl;
}
private ProviderInfo loadProviders(ClassLoader cl) {
// we create a merged map from reading all of the potential address map entries. The locations
// searched are:
// 1. java.home/lib/javamail.address.map
// 2. META-INF/javamail.address.map
// 3. META-INF/javamail.default.address.map
//
ProviderInfo info = new ProviderInfo();
// NOTE: Unlike the addressMap, we process these in the defined order. The loading routine
// will not overwrite entries if they already exist in the map.
try {
File file = new File(System.getProperty("java.home"), "lib/javamail.providers");
InputStream is = new FileInputStream(file);
try {
loadProviders(info, is);
if (debug) {
writeDebug("Loaded lib/javamail.providers from " + file.toString());
}
} finally{
is.close();
}
} catch (SecurityException e) {
// ignore
} catch (IOException e) {
// ignore
}
try {
Enumeration e = cl.getResources("META-INF/javamail.providers");
while (e.hasMoreElements()) {
URL url = (URL) e.nextElement();
if (debug) {
writeDebug("Loading META-INF/javamail.providers from " + url.toString());
}
InputStream is = url.openStream();
try {
loadProviders(info, is);
} finally{
is.close();
}
}
} catch (SecurityException e) {
// ignore
} catch (IOException e) {
// ignore
}
// we could be running in an OSGi environment, so there might be some globally defined
// providers
try {
Collection<URL> l = MailProviderRegistry.getProviders();
for (URL url : l) {
if (debug) {
writeDebug("Loading META-INF/javamail.providers from " + url.toString());
}
InputStream is = url.openStream();
try {
loadProviders(info, is);
} finally{
is.close();
}
}
} catch (SecurityException e) {
// ignore
} catch (IOException e) {
// ignore
}
try {
Enumeration e = cl.getResources("META-INF/javamail.default.providers");
while (e.hasMoreElements()) {
URL url = (URL) e.nextElement();
if (debug) {
writeDebug("Loading javamail.default.providers from " + url.toString());
}
InputStream is = url.openStream();
try {
loadProviders(info, is);
} finally{
is.close();
}
}
} catch (SecurityException e) {
// ignore
} catch (IOException e) {
// ignore
}
// we could be running in an OSGi environment, so there might be some globally defined
// providers
try {
Collection<URL> l = MailProviderRegistry.getDefaultProviders();
for (URL url : l) {
if (debug) {
writeDebug("Loading META-INF/javamail.providers from " + url.toString());
}
InputStream is = url.openStream();
try {
loadProviders(info, is);
} finally{
is.close();
}
}
} catch (SecurityException e) {
// ignore
} catch (IOException e) {
// ignore
}
// make sure this is added to the global map.
providersByClassLoader.put(cl, info);
return info;
}
private void loadProviders(ProviderInfo info, InputStream is) throws IOException {
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
String line;
while ((line = reader.readLine()) != null) {
// Lines beginning with "#" are just comments.
if (line.startsWith("#")) {
continue;
}
StringTokenizer tok = new StringTokenizer(line, ";");
String protocol = null;
Provider.Type type = null;
String className = null;
String vendor = null;
String version = null;
while (tok.hasMoreTokens()) {
String property = tok.nextToken();
int index = property.indexOf(‘=‘);
if (index == -1) {
continue;
}
String key = property.substring(0, index).trim().toLowerCase();
String value = property.substring(index+1).trim();
if (protocol == null && "protocol".equals(key)) {
protocol = value;
} else if (type == null && "type".equals(key)) {
if ("store".equals(value)) {
type = Provider.Type.STORE;
} else if ("transport".equals(value)) {
type = Provider.Type.TRANSPORT;
}
} else if (className == null && "class".equals(key)) {
className = value;
} else if ("vendor".equals(key)) {
vendor = value;
} else if ("version".equals(key)) {
version = value;
}
}
if (protocol == null || type == null || className == null) {
//todo should we log a warning?
continue;
}
if (debug) {
writeDebug("DEBUG: loading new provider protocol=" + protocol + ", className=" + className + ", vendor=" + vendor + ", version=" + version);
}
Provider provider = new Provider(type, protocol, className, vendor, version);
// add to the info list.
info.addProvider(provider);
}
}
/**
* Load up an address map associated with a using class loader
* instance.
*
* @param cl The class loader used to resolve the address map.
*
* @return A map containing the entries associated with this classloader
* instance.
*/
private static Map loadAddressMap(ClassLoader cl) {
// we create a merged map from reading all of the potential address map entries. The locations
// searched are:
// 1. java.home/lib/javamail.address.map
// 2. META-INF/javamail.address.map
// 3. META-INF/javamail.default.address.map
//
// if all of the above searches fail, we just set up some "default" defaults.
// the format of the address.map file is defined as a property file. We can cheat and
// just use Properties.load() to read in the files.
Properties addressMap = new Properties();
// add this to the tracking map.
addressMapsByClassLoader.put(cl, addressMap);
// NOTE: We are reading these resources in reverse order of what‘s cited above. This allows
// user defined entries to overwrite default entries if there are similarly named items.
try {
Enumeration e = cl.getResources("META-INF/javamail.default.address.map");
while (e.hasMoreElements()) {
URL url = (URL) e.nextElement();
InputStream is = url.openStream();
try {
// load as a property file
addressMap.load(is);
} finally{
is.close();
}
}
} catch (SecurityException e) {
// ignore
} catch (IOException e) {
// ignore
}
try {
Enumeration e = cl.getResources("META-INF/javamail.address.map");
while (e.hasMoreElements()) {
URL url = (URL) e.nextElement();
InputStream is = url.openStream();
try {
// load as a property file
addressMap.load(is);
} finally{
is.close();
}
}
} catch (SecurityException e) {
// ignore
} catch (IOException e) {
// ignore
}
try {
File file = new File(System.getProperty("java.home"), "lib/javamail.address.map");
InputStream is = new FileInputStream(file);
try {
// load as a property file
addressMap.load(is);
} finally{
is.close();
}
} catch (SecurityException e) {
// ignore
} catch (IOException e) {
// ignore
}
try {
Enumeration e = cl.getResources("META-INF/javamail.address.map");
while (e.hasMoreElements()) {
URL url = (URL) e.nextElement();
InputStream is = url.openStream();
try {
// load as a property file
addressMap.load(is);
} finally{
is.close();
}
}
} catch (SecurityException e) {
// ignore
} catch (IOException e) {
// ignore
}
// if unable to load anything, at least create the MimeMessage-smtp protocol mapping.
if (addressMap.isEmpty()) {
addressMap.put("rfc822", "smtp");
}
return addressMap;
}
/**
* Private convenience routine for debug output.
*
* @param msg The message to write out to the debug stream.
*/
private void writeDebug(String msg) {
debugOut.println(msg);
}
private static class ProviderInfo {
private final Map byClassName = new HashMap();
private final Map byProtocol = new HashMap();
private final List all = new ArrayList();
public void addProvider(Provider provider) {
String className = provider.getClassName();
if (!byClassName.containsKey(className)) {
byClassName.put(className, provider);
}
String protocol = provider.getProtocol();
if (!byProtocol.containsKey(protocol)) {
byProtocol.put(protocol, provider);
}
all.add(provider);
}
}
}
原文地址：https://www.cnblogs.com/rgqancy/p/8432085.html
时间： 2024-10-29 12:16:49