rml-io: Allow D2RQ without driver, username, password.

It may be useful for SQLite that does not require authentication.

Author: jduchateau

src/main/java/burp/ls/LogicalSourceFactory.java

@@ -120,21 +120,39 @@ public static LogicalSource createXMLSource(Resource ls, String mpath) {
 		return source;
 	}
 
+    private static RDBSource createRDBSource(Resource sourceNode) {
+        Statement jdbcDSNStmt = sourceNode.getProperty(D2RQ.jdbcDSN);
+        if (jdbcDSNStmt == null) {
+            throw new RuntimeException("RDB source must have a d2rq:jdbcDSN property");
+        }
+        String jdbcDSN = jdbcDSNStmt.getLiteral().getString();
+
+        Statement jdbcDriverStmt = sourceNode.getProperty(D2RQ.jdbcDriver);
+        String jdbcDriver = jdbcDriverStmt != null ? jdbcDriverStmt.getLiteral().getString() : null;
+
+        Statement usernameStmt = sourceNode.getProperty(D2RQ.username);
+        String username = usernameStmt != null ? usernameStmt.getLiteral().getString() : null;
+
+        Statement passwordStmt = sourceNode.getProperty(D2RQ.password);
+        String password = passwordStmt != null ? passwordStmt.getLiteral().getString() : null;
+
+        RDBSource source = new RDBSource();
+        source.jdbcDSN = jdbcDSN;
+        source.jdbcDriver = jdbcDriver;
+        source.username = username;
+        source.password = password;
+        // If getNullValuesSource does not exist, use getNullValues or implement accordingly
+        source.nulls.addAll(getNullValues(sourceNode));
+        return source;
+    }
+
 	public static LogicalSource createSQL2008TableSource(Resource ls, String mpath) {
 		Resource s = ls.getPropertyResourceValue(RML.source);
-		String jdbcDSN = s.getProperty(D2RQ.jdbcDSN).getLiteral().getString();
-		String jdbcDriver = s.getProperty(D2RQ.jdbcDriver).getLiteral().getString();
-		String username = s.getProperty(D2RQ.username).getLiteral().getString();
-		String password = s.getProperty(D2RQ.password).getLiteral().getString();
 
 		Statement t = ls.getProperty(RML.iterator);
 		String query = "(SELECT * FROM " + t.getLiteral() + ")";
 
-		RDBSource source = new RDBSource();
-		source.jdbcDSN = jdbcDSN;
-		source.jdbcDriver = jdbcDriver;
-		source.username = username;
-		source.password = password;
+		RDBSource source = createRDBSource(s);
 
 		// Apache jena "escapes" double quotes, so "Name" becomes \"Name\"
 		// which is internally stored as \\"Name\\". We thus need to remove
@@ -148,19 +166,11 @@ public static LogicalSource createSQL2008TableSource(Resource ls, String mpath)
 
 	public static LogicalSource createSQL2008QuerySource(Resource ls, String mpath) {
 		Resource s = ls.getPropertyResourceValue(RML.source);
-		String jdbcDSN = s.getProperty(D2RQ.jdbcDSN).getLiteral().getString();
-		String jdbcDriver = s.getProperty(D2RQ.jdbcDriver).getLiteral().getString();
-		String username = s.getProperty(D2RQ.username).getLiteral().getString();
-		String password = s.getProperty(D2RQ.password).getLiteral().getString();
 
 		Statement t = ls.getProperty(RML.iterator);
 		String query = t.getLiteral().toString();
 
-		RDBSource source = new RDBSource();
-		source.jdbcDSN = jdbcDSN;
-		source.jdbcDriver = jdbcDriver;
-		source.username = username;
-		source.password = password;
+		RDBSource source = createRDBSource(s);
 
 		// Apache jena "escapes" double quotes, so "Name" becomes \"Name\"
 		// which is internally stored as \\"Name\\". We thus need to remove