| 1 | package dolda.jsvc.util; |
| 2 | |
| 3 | import dolda.jsvc.*; |
| 4 | import java.util.*; |
| 5 | import java.security.SecureRandom; |
| 6 | |
| 7 | public abstract class Session implements java.io.Serializable { |
| 8 | public static final ContextParam<Storage> store = new ContextParam<Storage>(new MemoryStorage()); |
| 9 | private static final Map<Request, Session> cache = new WeakHashMap<Request, Session>(); |
| 10 | private final Map<Object, Object> props = new IdentityHashMap<Object, Object>(); |
| 11 | public long ctime = System.currentTimeMillis(), atime = ctime, etime = 86400 * 1000; |
| 12 | private Collection<Listener> ll = new HashSet<Listener>(); |
| 13 | |
| 14 | public static interface Listener { |
| 15 | public void destroy(Session sess); |
| 16 | } |
| 17 | |
| 18 | public static interface Storage { |
| 19 | public Session get(Request req); |
| 20 | } |
| 21 | |
| 22 | public static abstract class BaseStorage implements Storage { |
| 23 | private static final SecureRandom prng; |
| 24 | |
| 25 | static { |
| 26 | try { |
| 27 | prng = SecureRandom.getInstance("SHA1PRNG"); |
| 28 | } catch(java.security.NoSuchAlgorithmException e) { |
| 29 | throw(new Error(e)); |
| 30 | } |
| 31 | } |
| 32 | |
| 33 | public Session get(Request req) { |
| 34 | MultiMap<String, Cookie> cookies = Cookie.get(req); |
| 35 | Cookie sc = cookies.get("jsvc-session"); |
| 36 | |
| 37 | Session sess = null; |
| 38 | if(sc != null) |
| 39 | sess = get(sc.value); |
| 40 | if(sess == null) { |
| 41 | sess = create(req); |
| 42 | sc = new Cookie("jsvc-session", sess.id()); |
| 43 | sc.expires = new Date(System.currentTimeMillis() + (86400L * 365L * 1000L)); |
| 44 | sc.path = req.ctx().sysconfig("jsvc.session.path", req.rooturl().getPath()); |
| 45 | String pd = req.ctx().sysconfig("jsvc.session.domain", null); |
| 46 | if(pd != null) |
| 47 | sc.domain = pd; |
| 48 | sc.addto(req); |
| 49 | } |
| 50 | return(sess); |
| 51 | } |
| 52 | |
| 53 | protected abstract Session get(String id); |
| 54 | protected abstract Session create(Request req); |
| 55 | |
| 56 | public static String newid() { |
| 57 | byte[] rawid = new byte[16]; |
| 58 | prng.nextBytes(rawid); |
| 59 | StringBuilder buf = new StringBuilder(); |
| 60 | for(byte b : rawid) { |
| 61 | buf.append(Misc.int2hex((b & 0xf0) >> 4, false)); |
| 62 | buf.append(Misc.int2hex(b & 0x0f, false)); |
| 63 | } |
| 64 | return(buf.toString()); |
| 65 | } |
| 66 | } |
| 67 | |
| 68 | public static class MemoryStorage extends BaseStorage { |
| 69 | private final Map<Long, MemorySession> sessions = new HashMap<Long, MemorySession>(); |
| 70 | private static long lastclean = 0; |
| 71 | |
| 72 | private class MemorySession extends Session { |
| 73 | private final long id = BaseStorage.prng.nextLong(); |
| 74 | |
| 75 | private MemorySession(Request req) { |
| 76 | super(req); |
| 77 | } |
| 78 | |
| 79 | public void destroy() { |
| 80 | synchronized(sessions) { |
| 81 | sessions.remove(id); |
| 82 | } |
| 83 | super.destroy(); |
| 84 | } |
| 85 | |
| 86 | private void expire() { |
| 87 | super.destroy(); |
| 88 | } |
| 89 | |
| 90 | public String id() { |
| 91 | return(Long.toString(id)); |
| 92 | } |
| 93 | } |
| 94 | |
| 95 | public int num() { |
| 96 | synchronized(sessions) { |
| 97 | return(sessions.size()); |
| 98 | } |
| 99 | } |
| 100 | |
| 101 | public Session get(String id) { |
| 102 | long idl; |
| 103 | try { |
| 104 | idl = Long.parseLong(id); |
| 105 | } catch(NumberFormatException e) { |
| 106 | return(null); |
| 107 | } |
| 108 | synchronized(sessions) { |
| 109 | return(sessions.get(idl)); |
| 110 | } |
| 111 | } |
| 112 | |
| 113 | public synchronized Session create(Request req) { |
| 114 | MemorySession sess = new MemorySession(req); |
| 115 | synchronized(sessions) { |
| 116 | sessions.put(sess.id, sess); |
| 117 | } |
| 118 | return(sess); |
| 119 | } |
| 120 | |
| 121 | private void clean() { |
| 122 | long now = System.currentTimeMillis(); |
| 123 | synchronized(sessions) { |
| 124 | for(Iterator<MemorySession> i = sessions.values().iterator(); i.hasNext();) { |
| 125 | MemorySession sess = i.next(); |
| 126 | if(now > sess.atime + sess.etime) { |
| 127 | i.remove(); |
| 128 | sess.expire(); |
| 129 | } |
| 130 | } |
| 131 | } |
| 132 | } |
| 133 | |
| 134 | public Session get(Request req) { |
| 135 | long now = System.currentTimeMillis(); |
| 136 | if(now - lastclean > 3600 * 1000) { |
| 137 | clean(); |
| 138 | lastclean = now; |
| 139 | } |
| 140 | |
| 141 | return(super.get(req)); |
| 142 | } |
| 143 | } |
| 144 | |
| 145 | protected Session(Request req) { |
| 146 | int ct; |
| 147 | ct = Integer.parseInt(req.ctx().libconfig("jsvc.session.expire", "0")); |
| 148 | if(ct > 0) |
| 149 | etime = ct; |
| 150 | ct = Integer.parseInt(req.ctx().sysconfig("jsvc.session.expire", "0")); |
| 151 | if(ct > 0) |
| 152 | etime = ct; |
| 153 | } |
| 154 | |
| 155 | public abstract String id(); |
| 156 | |
| 157 | public void listen(Listener l) { |
| 158 | synchronized(ll) { |
| 159 | ll.add(l); |
| 160 | } |
| 161 | } |
| 162 | |
| 163 | public Object get(Object key, Object def) { |
| 164 | synchronized(props) { |
| 165 | if(props.containsKey(key)) |
| 166 | return(props.get(key)); |
| 167 | else |
| 168 | return(def); |
| 169 | } |
| 170 | } |
| 171 | |
| 172 | public synchronized Object put(Object key, Object val) { |
| 173 | return(props.put(key, val)); |
| 174 | } |
| 175 | |
| 176 | public void destroy() { |
| 177 | synchronized(ll) { |
| 178 | for(Listener l : ll) |
| 179 | l.destroy(this); |
| 180 | } |
| 181 | } |
| 182 | |
| 183 | public static Session get(Request req) { |
| 184 | Session sess; |
| 185 | synchronized(req) { |
| 186 | synchronized(cache) { |
| 187 | sess = cache.get(req); |
| 188 | } |
| 189 | if(sess == null) { |
| 190 | sess = store.get().get(req); |
| 191 | synchronized(cache) { |
| 192 | cache.put(req, sess); |
| 193 | } |
| 194 | } |
| 195 | sess.atime = System.currentTimeMillis(); |
| 196 | } |
| 197 | return(sess); |
| 198 | } |
| 199 | |
| 200 | public static Session get() { |
| 201 | return(get(RequestThread.request())); |
| 202 | } |
| 203 | } |