Users

Revision as of 16:47, 4 June 2013

This module configures the database account name and users management (add, update, remove and retrieve queries) kept in configuration file: users.conf.

Note: All database queries are done with PostgreSQL.

Example of create table users

This is an example of creating the users table:

CREATE TABLE users (
     username text NOT NULL,
     password text,
);

Configuration file

File users.conf

; This file configures the users management module

[database]
; This section configures user management database access

; account: string: The name of the database account
;account=

; add_user: string: Database query used to add a new user
; The query should fail if the user already exists
; Extra care must be taken when building this query: undesirable things may happen
;  like replacing an existing user's password or adding a duplicate, unreachable,
;  entry in the users table
;add_user=SELECT * FROM user_add('${user}','${password}')
 
; update_user: string: Database query used to update an existing user
;update_user=UPDATE users SET password='${password}' WHERE username='${user}'

; remove_user: string: Database query used to delete an existing user
;remove_user=DELETE FROM users WHERE username='${user}'

; select_user: string: Database query used to retrieve user's data
;select_user=SELECT * FROM users WHERE username='${user}'

Example for add_user procedure

This is an example of creating a stored procedure for adding a user:

CREATE FUNCTION user_add(text, text) RETURNS integer
   AS $_$
DECLARE
   _username ALIAS FOR $1;
   _password ALIAS FOR $2;
   n integer;
BEGIN
   SELECT INTO n COUNT(*) FROM users WHERE username=_username;
   IF n > 0 THEN
	n := 0;
   ELSE
	INSERT INTO users (username,password) VALUES (_username,_password);
	n := 1;
   END IF;
   RETURN n;
END;
$_$
   LANGUAGE plpgsql;

Commands

From telnet the command can be used to add/delete/update a user:

users {add user [parameter=value...]|delete user|update user [parameter=value...]}

See also

• Modules