| 1 |
5272
|
daigle
|
<%@ page contentType="text/plain;charset=ISO-8859-1" import="java.io.*" %>
|
| 2 |
|
|
<%
|
| 3 |
|
|
/************************************************
|
| 4 |
|
|
* This is an example implementation of a Kepler AuthNamespace web service.
|
| 5 |
|
|
*
|
| 6 |
|
|
* The output parameters are
|
| 7 |
|
|
* error, namespace
|
| 8 |
|
|
* The optional input parameters are
|
| 9 |
|
|
* username, password, namespace
|
| 10 |
|
|
*
|
| 11 |
|
|
************************************
|
| 12 |
|
|
* Kepler AuthNamespace Web Service *
|
| 13 |
|
|
************************************
|
| 14 |
|
|
*
|
| 15 |
|
|
* The namespace that is returned shall always be unique for the given URL regardless of URI input parameters
|
| 16 |
|
|
* The file type returned by the webservice shall be text/plain and shall contain the two output parameters
|
| 17 |
|
|
* formatted in accordance with the java.util.Properties specification.
|
| 18 |
|
|
*
|
| 19 |
|
|
* Optionally a username and password parameter may be supplied to the webservice for authenticating users
|
| 20 |
|
|
* or simply for disallowing robots from accessing the service.
|
| 21 |
|
|
* Implementations of the AuthNamespace service may also optionally accept a namespace as an input,
|
| 22 |
|
|
* check to see if that namespace is available, and return it if it is available or return an error if it is not.
|
| 23 |
|
|
*
|
| 24 |
|
|
************************************************/
|
| 25 |
|
|
try {
|
| 26 |
|
|
/*
|
| 27 |
|
|
* The authority string should exactly match the URL this service is accessed by.
|
| 28 |
|
|
* This prevents having multiple URLs accessing this same JSP page which would be bad
|
| 29 |
|
|
* since the namespaces generated by an authority must be unique to that authority.
|
| 30 |
|
|
*/
|
| 31 |
5274
|
daigle
|
String authority = "http://library.kepler-project.org/kepler/style/skins/kepler/keplerAuthNameSpace.jsp";
|
| 32 |
5272
|
daigle
|
String accessedAuthority = request.getRequestURL().toString();
|
| 33 |
|
|
|
| 34 |
|
|
/*
|
| 35 |
|
|
* Get username and password inputs.
|
| 36 |
|
|
*/
|
| 37 |
|
|
String user = request.getParameter( "username" );
|
| 38 |
|
|
String pass = request.getParameter( "password" );
|
| 39 |
|
|
|
| 40 |
|
|
/*
|
| 41 |
|
|
* Make sure the URL used to access this service is the correct authority URL.
|
| 42 |
|
|
*/
|
| 43 |
|
|
if ( accessedAuthority != null && accessedAuthority.equals( authority )) {
|
| 44 |
|
|
|
| 45 |
|
|
/*
|
| 46 |
|
|
* Check to make sure the "kepler" username/password was given
|
| 47 |
|
|
* This will prevent stray robots or users from incrementing namespaces arbitrarily.
|
| 48 |
|
|
*/
|
| 49 |
5274
|
daigle
|
if ( user != null && user.equals("kepler") ) {
|
| 50 |
|
|
if ( pass != null && pass.equals("kepler") ) {
|
| 51 |
5272
|
daigle
|
|
| 52 |
|
|
if ( request.getParameter( "namespace" ) != null ) {
|
| 53 |
|
|
// TODO query a database for the requested namespace
|
| 54 |
|
|
// print namespace if it is not already taken and insert it into the database
|
| 55 |
|
|
// return an error if the namespace has already been reserved
|
| 56 |
|
|
} else {
|
| 57 |
|
|
|
| 58 |
|
|
/* Store an incrementing integer in a file.
|
| 59 |
|
|
* This approach may fail due to collisions under high load conditions.
|
| 60 |
|
|
* But works fine for this example implementation.
|
| 61 |
|
|
*/
|
| 62 |
|
|
ServletContext context = session.getServletContext();
|
| 63 |
5274
|
daigle
|
String fname = "/var/kepler/last_issued_namespace.txt";
|
| 64 |
5272
|
daigle
|
|
| 65 |
|
|
Integer inc = new Integer(0);
|
| 66 |
|
|
|
| 67 |
|
|
File f = new File( fname );
|
| 68 |
|
|
if (f.exists()) {
|
| 69 |
|
|
|
| 70 |
|
|
// Read in the previous Integer
|
| 71 |
|
|
InputStream is = new FileInputStream(fname);
|
| 72 |
|
|
ObjectInput oi = new ObjectInputStream(is);
|
| 73 |
|
|
inc = (Integer) oi.readObject();
|
| 74 |
|
|
oi.close();
|
| 75 |
|
|
|
| 76 |
|
|
int i = inc.intValue() + 1;
|
| 77 |
|
|
inc = new Integer( i );
|
| 78 |
|
|
|
| 79 |
|
|
}
|
| 80 |
|
|
|
| 81 |
|
|
// Write out the incremented integer (or 0 if the file does not exist)
|
| 82 |
|
|
OutputStream os = new FileOutputStream(fname);
|
| 83 |
|
|
ObjectOutputStream oos = new ObjectOutputStream(os);
|
| 84 |
|
|
oos.writeObject( inc );
|
| 85 |
|
|
oos.flush();
|
| 86 |
8304
|
jones
|
oos.close();
|
| 87 |
5272
|
daigle
|
|
| 88 |
|
|
/*
|
| 89 |
|
|
* Print out the incremented Integer as the namespace output
|
| 90 |
|
|
* in java.util.Properties format.
|
| 91 |
|
|
*/
|
| 92 |
|
|
out.println( "namespace=" + inc + "\n" );
|
| 93 |
|
|
}
|
| 94 |
|
|
|
| 95 |
|
|
} else {
|
| 96 |
|
|
throw new Exception("The specified password is incorrect");
|
| 97 |
|
|
}
|
| 98 |
|
|
} else {
|
| 99 |
|
|
throw new Exception("The specified username is incorrect.");
|
| 100 |
|
|
}
|
| 101 |
|
|
} else {
|
| 102 |
|
|
throw new Exception("The specified authority URL is incorrect.");
|
| 103 |
|
|
}
|
| 104 |
|
|
|
| 105 |
|
|
} catch (Exception e) {
|
| 106 |
|
|
|
| 107 |
|
|
/*
|
| 108 |
|
|
* Print out the error in java.util.Properties format.
|
| 109 |
|
|
*/
|
| 110 |
|
|
out.println( "error=" + e.getMessage() + "\n" );
|
| 111 |
|
|
}
|
| 112 |
|
|
%>
|