util.php

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<?php


require_once('Smarty.class.php');
require_once('error.php');
require_once 'const.php';
require_once('config.php');
require_once('sql.php');


#

function check_input( $user_input, $validation_info, $strict_mode = TRUE ) {

        global $debug_level;

        $err_info = array();

        foreach ($validation_info as $k => $dummy) {
                if (!isset($user_input[$k])) {
                        $user_input[$k] = ""; 
                }
        }


        if ($debug_level > 20) {
                print "<hr><pre>";
                print "check_input():\n\n";
        }

        foreach ($user_input as $k => $v) {

                $type = gettype($v);

                switch($type) {

                case "string":

                        if (isset($validation_info[$k])) {
                                $ok = preg_match($validation_info[$k], $v);
                        } else {
                                $ok = ($strict_mode) ? FALSE : TRUE;
                        }
                        break;

                case "array":
                        $ok = TRUE;
                        break;

                default:
                        $ok = FALSE;
                }
        

                if ($debug_level > 20) {
                        print "key: $k\n" ;
                        print "value: $v\n" ;
                        print "regexp: " . $validation_info[$k]. "\n"; 
                        print "ok: " ;
                        print (($ok) ? "yes" : "no" ) . "\n\n"; 
                }


                if (!$ok) { 
                        $err_info[] = $k; 
                }
        }

        if ($debug_level > 20) {
                print "</pre></hr>";
        }

        return $err_info;
}



function do_template($smarty, $template, $kw, $remember_me = FALSE ) {

        global $_SESSION, $_SERVER, $debug_level;
        
        $smarty->compile_check = TRUE;

        # turn on debugging if so requested

        if ($debug_level > 5) {
                $smarty->debugging = true;
        }

        # assign smarty variables

        foreach ($kw as $k => $v)  {
                $smarty->assign($k, $v);
        }

        # add a header and a footer

        $smarty->display('header.tpl');
        $smarty->display($template);
        $smarty->display('footer.tpl');

        # clean up

        foreach ($kw as $k => $v)  {
                $smarty->clear_assign($k, $v);
        }

        # remember current page

        if ($remember_me) {
                $_SESSION['last_page'] = $_SERVER['REQUEST_URI'];
        }
}


# XXX the purpose of this function cannot be easily described, sorry. 
# Use the source, luke.

function get_html_options($tables, $db, $key = "id" , $value = "description", 
                $order_by = "description", $default = array() )  {

        $options = array ();

        foreach ($tables as $t) {

                $options[$t] = $default;

                $param = array ( "tables" => $t,
                        "order" => "$order_by asc"
                );

                $ans = sql_query('select', $param, $db);

                if (empty($ans)){
                user_error("database query failed for table $t" , 
                        E_USER_ERROR); 
                }

                foreach ($ans as $a) {
                        $k = $a[$key];
                        $v = $a[$value];
                        $options[$t][$k] = $v;
                }
        }

        return $options;
}


function get_item_owner($item, $id, $db ) {

        switch($item) {

                case "user":
                        $p = array ( tables => "user,degree", 
                        columns => "user.*,degree.description AS degree_description",
                        cond => "user.id = $id AND degree.id = user.degree_id");
                        $ans = sql_query('select',$p, $db);

                        if (empty($ans)) {
                                user_error("database query failed" , 
                                E_USER_ERROR); 
                        }

                        $user = $ans[0];
                        
                        break;

                case "collection":

                        $p = array (tables => "collection",cond => "id = $id");
                        $ans = sql_query('select',$p, $db);

                        if (empty($ans)) {
                                user_error("database query failed" , 
                                E_USER_ERROR); 
                        }

                        $user = get_item_owner("user", $ans[0]['user_id'], $db);
                        break;

                case "email":

                        $p = array (tables => "email", cond => "id = $id");
                        $ans = sql_query('select',$p, $db);

                        $user = get_item_owner("document", 
                                        $ans[0]['document_id'], $db);
                        break;

                default:
                        $p = array (tables => "document",cond => "id = $id");
                        $ans = sql_query('select', $p, $db);

                        if (empty($ans)) {
                                user_error("database query failed" , 
                                E_USER_ERROR); 
                        }

                        $user = get_item_owner("collection", 
                                $ans[0]['collection_id'], $db);
                        break;
        }

        return $user;
}


function send_email($smarty, $template, $kw, $email_to ) {

        global $_SESSION, $default_email_from, $default_email_subject;

        $email_from = $default_email_from;

        if (isset($_SESSION['user'])) {

                $u = $_SESSION['user'];
                $email_from =   $u['forename'] . " " . $u['surname'] .  
                                " <" . $u['email'] . ">";

        }

        foreach ($kw as $k => $v)  {
                $smarty->assign($k, $v);
        }

        $email_txt = $smarty->fetch($template); 


        foreach ($kw as $k => $v)  {
                $smarty->clear_assign($k, $v);
        }

        $headers = "From: $email_from\r\n\r\n";
        mail(  $email_to, $default_email_subject, $email_txt, $headers);
}


function get_new_expiry_date() {

        # At TU Braunschweig, the semester ends on March and September, so 
        # we choose the beginning of the next semester as an expiration date.

        $t = getdate();

        $t['mday'] = 1; 

        if ($t['mon'] <= 2) { 
                $t['mon'] = 4; 
        } else if ($t['mon'] <= 7) { 
                $t['mon'] = 10; 
        } else {
                $t['mon'] = 4; 
                $t['year']++; 
        }

        $ans = sprintf("%04d%02d%02d", $t['year'] , $t['mon'] , $t['mday']);
        
        return $ans;

}


function check_acl($acl_list, $item, $id, $db) {
        global $_SESSION;

        if (isset($acl_list[$item])) {
                $acl = $acl_list[$item];
        } else if (isset($acl_list['any'])) {
                $acl = $acl_list['any'];
        } else {
                return FALSE;
        }

        foreach (split(',', $acl) as $a) {

                list($k, $v) = split('=', $a);

                $inverse = false;

                switch($k) {
                case "!owner":
                        $inverse = TRUE;
                case "owner":

                        if ($id != "") {
                                $u = $_SESSION['user'];
                                $o = get_item_owner($item, $id, $db); 
                                $ok = ($u['id'] == $o['id']);
                        }

                        break;

                case "!role":
                        $inverse = TRUE;
                case "role":
                        $u = $_SESSION['user'];
                        $ok = ($u['role_name'] == $v);
                        break;

                case "!any":
                        $inverse = TRUE;
                case "any":
                        $ok = TRUE;
                        break;
                default:
                        user_error("acl syntax error: $k" , 
                        E_USER_ERROR); 
                }

                if ($inverse) {
                        $ok = (!$ok);
                }

                if ($ok) {
                        break;
                }       
        }

        return $ok;
}


function set_random_pw($uid, $dblink) {
 
        $keychars = "abcdefghijklmnopqrstuvwxyz0123456789";
        $length = 6;

        $passwd = "";
        $max=strlen($keychars)-1;

        for ($i=0 ; $i<=$length ; $i++) {
                $passwd .= substr($keychars, rand(0, $max), 1);
        }

        $pw_crypt = "{SHA1}" . sha1($passwd);

        # set login / password

        $param = array (
                "tables" => "user" ,
                "data" => array ( "password" => $pw_crypt ), 
                 cond => "id = " . $uid,
        );


        sql_query('update', $param, $dblink);

        return $passwd;
}


function smarty_init() {
        global $templates_compile_dir;

        $smarty =& new Smarty;
        $smarty->compile_check = true;
        #$smarty->debugging = true;

        # set paths
        $smarty->template_dir = "../templates";
        $smarty->compile_dir = $templates_compile_dir;
        $smarty->config_dir = "../configs";

        return $smarty;
}


function guess_mime_type($fn) {
        global $mime_types;

        #normalize filename

        $fn = strtolower(basename(strtolower($fn)));

        $mime_type='application/octet-stream'; # catch-all

        foreach ($mime_types as $preg => $value ) {
                if (preg_match($preg, $fn) > 0) {
                        $mime_type = $value;
                        break;
                } 
        }
        
        return $mime_type;
}

?>

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