Do not allow login with empty group code or empty login code even if an...

Do not allow login with empty group code or empty login code even if an corresponding entry exists in the database

src/db_conn.base.rs

@@ -421,6 +421,10 @@ impl MedalConnection for Connection {
 
     //TODO: use session
     fn login_with_code(&self, _session: Option<&str>, logincode: &str) -> Result<String, ()> {
+        if logincode == "" {
+            return Err(());
+        }
+
         let query = "SELECT id
                      FROM session
                      WHERE logincode = $1";
@@ -506,6 +510,10 @@ impl MedalConnection for Connection {
 
     //TODO: use session
     fn create_user_with_groupcode(&self, _session: Option<&str>, groupcode: &str) -> Result<String, ()> {
+        if groupcode == "" {
+            return Err(());
+        }
+
         let query = "SELECT id
                      FROM usergroup
                      WHERE groupcode = $1";

src/db_conn_postgres.rs

@@ -533,6 +533,10 @@ impl MedalConnection for Connection {
 
     //TODO: use session
     fn login_with_code(&self, _session: Option<&str>, logincode: &str) -> Result<String, ()> {
+        if logincode == "" {
+            return Err(());
+        }
+
         let query = "SELECT id
                      FROM session
                      WHERE logincode = $1";
@@ -618,6 +622,10 @@ impl MedalConnection for Connection {
 
     //TODO: use session
     fn create_user_with_groupcode(&self, _session: Option<&str>, groupcode: &str) -> Result<String, ()> {
+        if groupcode == "" {
+            return Err(());
+        }
+
         let query = "SELECT id
                      FROM usergroup
                      WHERE groupcode = $1";

src/db_conn_sqlite_new.rs

@@ -533,6 +533,10 @@ impl MedalConnection for Connection {
 
     //TODO: use session
     fn login_with_code(&self, _session: Option<&str>, logincode: &str) -> Result<String, ()> {
+        if logincode == "" {
+            return Err(());
+        }
+
         let query = "SELECT id
                      FROM session
                      WHERE logincode = ?1";
@@ -618,6 +622,10 @@ impl MedalConnection for Connection {
 
     //TODO: use session
     fn create_user_with_groupcode(&self, _session: Option<&str>, groupcode: &str) -> Result<String, ()> {
+        if groupcode == "" {
+            return Err(());
+        }
+
         let query = "SELECT id
                      FROM usergroup
                      WHERE groupcode = ?1";