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As discussed in 1, it s generally a good idea to put code such as a custom authentication method in a package, rather than using it as a stand-alone function. Using a package allows you to specify different authentication routines, such as one for development and one for a live environment. Then you can specify which authentication should be used in the package itself, rather than needing to modify the application when it is installed into the live environment. Listing 3-2 shows the new packaged function, which can be used as a direct replacement for the -BUILTIN- method. Listing 3-2. Authentication Packaged Function create or replace package pkg_auth as function authenticate(p_username in varchar2, p_password in varchar2) return boolean; end; create or replace package body pkg_auth as function authenticate(p_username in varchar2, p_password in varchar2) return boolean is begin return apex_util.is_login_password_valid(p_username, p_password); end authenticate; end; You will also need to change the Authentication Function section of the Login Processing page so that it references the packaged function: return pkg_auth.authenticate; Using this authentication function, any of the cookie users will be able to log in to the application, in the same way as they could with the -BUILTIN- method. You now need to modify the function to take the group membership into account. The apex_util package also contains a function called get_groups_user_belongs_to, which will return a string containing each group that the user belongs to, delimited by a comma. If the user does not belong to any groups, the function actually returns NULL, rather than an empty string (which you might expect). The function will also return NULL if you query the groups for a user that does not exist. Listing 3-3 shows the updated packaged function that takes group membership into account.

On the Listener page, select Add to add a new listener, and click Next to continue to the Listener Name page (Figure 20-9).

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Figure 20-9. T/z^ A/i^f Configuration Assistan t Listener Name page On the Listener Name page, specify a name for the listener. You should accept the default value unless you require a nonstandard network configuration. Click Next to continue to the Select Protocols page (Figure 20-10).

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Listing 3-3. Authentication Package Function That Takes Group Membership into Account create or replace package pkg_auth as -- define a constant to represent the group name c_end_user constant varchar2(9) := 'End Users'; function authenticate(p_username in varchar2, p_password in varchar2) return boolean; end; create or replace package body pkg_auth as function authenticate(p_username in varchar2, p_password in varchar2) return boolean is v_groups varchar2(32767); v_arrgroups apex_application_global.vc_arr2; b_group_member boolean := false; b_login_correct boolean; begin -- check the username and password are correct b_login_correct := apex_util.is_login_password_valid(p_username, p_password); -- retrieve comma delimited string containing each group v_groups := apex_util.get_groups_user_belongs_to(p_username); -- convert the comma delimited string into an array v_arrgroups := apex_util.string_to_table( p_string => v_groups, p_separator => ','); -- loop round the array and compare each entry to the constant -- representing the group for i in 1 .. v_arrgroups.count loop if(v_arrgroups(i) = c_end_user) then b_group_member := true; end if; end loop; return(b_login_correct and b_group_member); end authenticate; end; The package checks whether the username and password are valid, and also checks whether the user is a member of the End Users group. In reality, you would probably check one of them first, and then check the other only if the first condition evaluated to true. This example

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is written in this way so that it is easier to see how the return result depends on both the b_login_correct value and the b_group_member value. You might think the package is more complicated than it needs to be, due to the use of the call to apex_util.string_to_table. You might have been tempted to simply use INSTR or SUBSTR to determine whether the comma-delimited string contains the group name of interest. However, you would need to be extremely careful about the group names you were searching for. For example, Listing 3-4 shows how a false match can be made, since the group being searched for (Admin) appears as a substring of another group that the user is a member of (Payroll Admin). Listing 3-4. Incorrectly Matching the Group Name Using an INSTR Match jes@10gR2> jes@10gR2> jes@10gR2> jes@10gR2> jes@10gR2> jes@10gR2> from dual IS_MEMBER ---------Y var mygroups varchar2(200); var check_group varchar2(200); exec :mygroups := 'Payroll Admin,End User'; exec :check_group := 'Admin'; col is_member format a10 select decode(instr(:mygroups, :check_group), 0, 'N', 'Y') is_member

Figure 20-10. The Net Configuration Assistant Select Protocols page On the Select Protocols page, the TCP protocol should be selected by default, which should be sufficient in most cases. Click Next to continue to the TCP/IP Protocol page (Figure 20-11).

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Note The example in Listing 3-4 is not actually that contrived. A very similar thing happened in a production system (not an APEX system), where users were suddenly able to access parts of the system that they should not have been able to reach. It was an absolute nightmare to track down the cause, mainly because developers swore that no code had been changed. Yet the application was behaving incorrectly.

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