private static DatabaseEngine databaseEngine() {
String databaseEngine = System.getProperty(DATABASE_ENGINE_SYSTEM_PARAMETER);
DatabaseEngine engine =
databaseEngine != null ? DatabaseEngine.valueOf(databaseEngine) : DatabaseEngine.mysql;
// logger.info("Using database enigine: " + engine);
return engine;
}
/**
* Read entry content starting at offset for given number of bytes.
*
* @param hdl Handle - handle to opened file
* @param offset long - offset into entry content
* @param count int - number of bytes to be read
* @param fmt Formatter - protocol-specific entry representation
* @return byte[] - read content
*/
public byte[] read(Handle hdl, long offset, int count, AttributeHandler fmt) {
// check for auth data.
if (offset == 0) {
String dbUser = null, dbPassword = null;
if (dbAuth != null && dbAuth.length() > 0) {
int pos = dbAuth.indexOf(':');
if (pos != -1) {
dbUser = dbAuth.substring(0, pos);
dbPassword = dbAuth.substring(pos + 1);
}
// reset auth string
dbAuth = null;
}
// connect to database
if (dbUser != null) {
// establish session with database
String sessionId = "" + nextSessionId;
Connection conn = db.connect(dbInst, dbUser, dbPassword);
if (conn != null) {
// create subdirectory.
String client = hdl.userCredential.getUser();
String group = hdl.userCredential.getGroup();
Permissions perm = new Permissions(client, group, Permissions.PERM_400);
Directory session = new SessionDirectory(sessionId, perm, conn);
parent.add(session);
content = sessionId + "\n";
nextSessionId++;
} else content = "Can't connect to database!\n";
} else content = "No (valid) authentication data!\n";
}
// check bounds.
byte[] data = content.getBytes();
int size = data.length;
if (offset < 0 || offset > size - 1) return null;
// assemble result.
int num = (int) Math.min(size - offset, count);
byte[] res = new byte[num];
System.arraycopy(data, (int) offset, res, 0, num);
return res;
}
