Add SAML based SSO Login link

Bug #810302

Add a link to auth/saml if the SAML auth plugin is enabled
This appears on all login panels
(whitespace given back)
Switched to checking auth_instance
Moved login string to this commit
This appears on login diversion page

Change-Id: Ia8a799396a9f33bc0cc6e0c59549e2464253ca31
Signed-off-by: Piers Harding <piers@catalyst.net.nz>

htdocs/auth/lib.php

@@ -1016,6 +1016,9 @@ function auth_get_login_form() {
         'register' => array(
             'value' => '<div id="login-helplinks">' . '<a href="' . get_config('wwwroot') . 'forgotpass.php" tabindex="2">' . get_string('lostusernamepassword') . '</a></div>'
         ),
+        'loginsaml' => array(
+            'value' => ((count_records('auth_instance', 'authname', 'saml') == 0) ? '' : '<div id="login-helplinks"><a href="' . get_config('wwwroot') . 'auth/saml/" tabindex="2">' . get_string('login', 'auth.saml') . '</a></div>')
+        ),
         'login_submitted' => array(
             'type'  => 'hidden',
             'value' => 1
@@ -1568,7 +1571,10 @@ function auth_generate_login_form() {
             'register' => array(
                 'value' => '<div id="login-helplinks">' . $registerlink
                     . '<a href="' . get_config('wwwroot') . 'forgotpass.php" tabindex="2">' . get_string('lostusernamepassword') . '</a></div>'
-            )
+            ),
+            'loginsaml' => array(
+                'value' => ((count_records('auth_instance', 'authname', 'saml') == 0) ? '' : '<a href="' . get_config('wwwroot') . 'auth/saml/" tabindex="2">' . get_string('login', 'auth.saml') . '</a>')
+            ),
         )
     )));
 

htdocs/auth/saml/lang/en.utf8/auth.saml.php

@@ -40,6 +40,7 @@ $string['errormissinguserattributes'] = 'You seem to be authenticated but we did
 $string['institutionattribute'] = 'Institution attribute (contains "%s")';
 $string['institutionvalue'] = 'Institution value to check against attribute';
 $string['institutionregex'] = 'Do partial string match with institution shortname';
+$string['login'] = 'SSO Login';
 $string['notusable'] = 'Please install the SimpleSAMLPHP SP libraries';
 $string['samlfieldforemail'] = 'SSO field for Email';
 $string['samlfieldforfirstname'] = 'SSO field for First Name';