fix: avoid user provisioning when user already exists (#8738)

* fix: use uid of the user when existing #8734

Signed-off-by: jgomer2001 <bonustrack310@gmail.com>

* doc: fix broken link #8734

Signed-off-by: jgomer2001 <bonustrack310@gmail.com>

---------

Signed-off-by: jgomer2001 <bonustrack310@gmail.com>
Co-authored-by: Mohammad Abudayyeh <47318409+moabu@users.noreply.github.com>

docs/casa/index.md

@@ -50,7 +50,7 @@ Besides a comprehensive graphical [admin console](./administration/admin-console
 
 Casa is a plugin-oriented, Java web application. Existing functionality can be extended and new functionality and APIs can be introduced through plugins. Currently, there are plugins available for the following:
 
-- [Accounts linking](./plugins/accts-linking/index.md)
+- [Accounts linking](./plugins/accts-linking/account-linking-index.md)
 - [Consent management](./plugins/consent-management.md) 
 - [Custom branding](./plugins/custom-branding.md)  
 - [2FA settings](./plugins/2fa-settings.md)

jans-casa/plugins/acct-linking/extras/agama/lib/io/jans/casa/acctlinking/UidUtils.java

@@ -17,22 +17,24 @@ public class UidUtils {
 
     public static String lookupUid(String uidRef, String uid, String extUid, String jansExtAttrName,
             String jansExtUid) throws IOException {
-
-        if (uidRef == null) {            
-            boolean uidPassed = uid != null;
-
-            if (uidPassed) {
-                logger.debug("Using uid passed: {}", uid);
-                return uid;
-            }
-
+
+        if (uidRef == null) {
             //Find if the external account is already linked to a local one
             User user = CdiUtil.bean(UserService.class).getUserByAttribute(jansExtAttrName, jansExtUid, true);
+
             if (user == null) {
+                boolean uidPassed = uid != null;
+
+                if (uidPassed) {
+                    logger.debug("Using uid passed: {}", uid);
+                    return uid;
+                }
+
                 logger.info("Building a uid based on external id {}", extUid);
                 return extUid + "-" + randSuffix(3);
             }
-            logger.info("Using uid of the account already linked to {}", extUid); 
+
+            logger.info("Using uid of the account already linked to {}", jansExtUid); 
             return user.getUserId();
         }