Check for duplicate email

geneit_backend/src/controllers/auth_controller.rs

@@ -29,9 +29,20 @@ pub async fn create_account(
         return Ok(HttpResponse::BadRequest().json("Size constraints were not respected!"));
     }
 
-    // TODO : check the mail address
+    // Check if email is already attached to an account
+    match users_service::exists_email(&req.email).await {
+        Ok(false) => {}
+        Ok(true) => {
+            return Ok(HttpResponse::Conflict()
+                .json("An account with the same email address already exists!"));
+        }
+        Err(e) => {
+            log::error!("Failed to check email existence! {}", e);
+            return Err(ErrorInternalServerError(e));
+        }
+    }
 
-    // Create  the account
+    // Create the account
     let user_id = users_service::create_account(&req.name, &req.email)
         .await
         .map_err(|e| {