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Function to retrieve the forums a user can access
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Admin Admin is offline 08-04-2002, 10:00 PM

This is something I once wrote for someone (think it was merk?), and kept it in a file, and finally got around to clean it up and wrap it in a function.

Very useful for some hacks, hope this helps at least some of you.
Here is the full function, along with some basic instructions:

PHP Code:
/***********************************************************************
 * Parameters:
 *    1.    The name of the permission you want to check for.
 *        Alternatively, it can take an array of permissions.
 *        Defaults to 'canview'.
 *    2.    The user ID of the user you are checking permissions for.
 *        Defaults to -1 (i.e current viewer).
 *    3.    The separator for the list of forum ID's.
 * Return:
 *    1.    If the first parameter is a string, the function will
 *        return the list of forum ID's.
 *    2.    If the first parameter is an array, the function will
 *        return an associative array of permission => forum ID's.
 * Example usage:
 *    1.    get_allowed_forums();
 *            Will return the list of forums the current user can view:
 *            1,5,6,8
 *    2.    get_allowed_forums(array('canview', 'canpostnew'), 2);
 *            Will return an array that contains two keys, canview and
 *            canpostnew, each referring to the list of forums user
 *            number 2 can access:
 *            Array
 *            (
 *                [canview] => 3,5,7,8
 *                [canpostnew] => 3,7
 *            )
 **********************************************************************/
function get_allowed_forums ($checkfor 'canview'$userid = -1$separator ',') {
    global 
$permissions$DB_site$bbuserinfo$enableaccess$hideprivateforums;

    if (
$userid == -1) {
        
$userinfo $bbuserinfo;
    } else {
        
$userinfo getuserinfo($userid);
    }

    if (
is_array($checkfor)) {
        
$select implode(', '$checkfor);
    } else {
        
$select $checkfor;
    }
    
$forumpermissions $DB_site->query("
        SELECT forumid, 
$select
        FROM forumpermission
        WHERE usergroupid = 
$userinfo[usergroupid]
    "
);
    while (
$forumpermission $DB_site->fetch_array($forumpermissions)) {
        
$forumpermscache[$forumpermission['forumid']] = $forumpermission;
    }

    if (
$userinfo['userid'] != and $enableaccess) {
        
$accesspermissions $DB_site->query("
            SELECT forumid, accessmask
            FROM access
            WHERE userid = 
$userinfo[userid]
        "
);
        while (
$accesspermission $DB_site->fetch_array($accesspermissions)) {
            
$accesscache[$accesspermission['forumid']] = $accesspermission;
        }

        if (
is_array($checkfor)) {
            foreach (
$checkfor as $permname) {
                
$usergroupdefault[$permname] = $permissions[$permname];
                
$nopermissions[$permname] = 0;
            }
        } else {
            
$usergroupdefault = array(
                
$checkfor => $permissions[$checkfor]
            );
            
$nopermissions = array(
                
$checkfor => 0
            
);
        }
    }

    
// (This is a really really fast query since it only
    //  uses the index and not the actual table.)
    
$forums $DB_site->query('SELECT forumid FROM forum');
    while (
$forum $DB_site->fetch_array($forums)) {
        if (
$enableaccess and is_array($accesscache[$forum['forumid']])) {
            if (
$accesscache[$forum['forumid']]['accessmask'] == 1) {
                
$forumperms $usergroupdefault;
            } else {
                
$forumperms $nopermissions;
            }
        } elseif (
is_array($forumpermscache[$forum['forumid']])) {
            
$forumperms $forumpermscache[$forum['forumid']];
        } else {
            
$forumperms $permissions;
        }

        if (
is_array($checkfor)) {
            foreach (
$checkfor as $permname) {
                if ((!
$hideprivateforums and $permname == 'canview') or $forumperms[$permname]) {
                    if (
$allowedforums[$permname]) {
                        
$allowedforums[$permname] .= $separator;
                    }
                    
$allowedforums[$permname] .= $forum['forumid'];
                }
            }
        } else {
            if ((!
$hideprivateforums and $checkfor == 'canview') or $forumperms[$checkfor]) {
                if (
$allowedforums) {
                    
$allowedforums .= $separator;
                }
                
$allowedforums .= $forum['forumid'];
            }
        }
    }

    return 
$allowedforums;

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  #2  
Old 08-05-2002, 10:55 AM
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Lesane Lesane is offline
 
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Great function, very usefull indeed. Thanks.
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  #3  
Old 08-08-2002, 08:42 AM
Dark_Wizard Dark_Wizard is offline
 
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Wow...very useful I agree. Thank you!
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  #4  
Old 08-08-2002, 09:15 AM
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I should mention that the function only issues 3 queries, one of which VERY fast.
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  #5  
Old 08-11-2002, 01:48 AM
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JJR512 JJR512 is offline
 
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I seem to be having some problems with this.

I've added the entire function to functions.php. I added it as the second-to-last function, above doshutdown.

I tried to use the function from global.php (the forums, not the admin). Right above the part of global.php that parses the css (headinclude), header, and footer.

I've tried $jjr512=get_allowed_forums();. I've tried $jjr512=get_allowed_forums('canview',-1,',');. I've tried a lot of things. But whenever I try to use the function, I get this error: "Warning: Bad arguments to implode() in /home/jjr512/public_html/testvb/admin/functions.php on line 2289" Now as I have it in my functions.php, Line 2289 is:
Code:
SELECT forumid, '.iif(is_array($checkfor), implode(', ', $checkfor), $checkfor)."
What am I doing wrong?
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  #6  
Old 08-11-2002, 12:44 PM
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Try the new version.
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  #7  
Old 08-11-2002, 03:36 PM
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MrLister MrLister is offline
 
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great, thank you!
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  #8  
Old 08-16-2002, 09:36 PM
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This is a great function, and i'm using it right now for some custom statistics.

Thing is though, Guests and normal members and stuff get permissions returned that they don't have "canview" permissions to.

Any thoughts?
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  #9  
Old 08-17-2002, 02:24 PM
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I think what is happening, is if a forum is using permissions from it's parent forum, then it doesn't get taken into account.

If you know what I mean?
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  #10  
Old 08-18-2002, 06:25 AM
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very usefull, as lesane said before. thanks for posting it.
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