docs: add supabase sql and readme info

README.md

@@ -89,9 +89,23 @@ The directory structures for business domains are as follows:
 
 > **Tip** I know it may sound repetitive, but it is not a framework. NExp is a set of tools or libraries working together through a common structure. All structural code within this project is not fixed and can be changed freely.
 
+### Supabase integration
+
+In the infrastructure folder there is a file called `supabase_permissions.sql` this file is used to manage permissions 
+with these tables.
+
+* roles
+* permissions
+* users_has_roles
+* roles_has_permissions
+
+And a function call `get_authorization`.
+
 ## Advantages
 
-The advantages of using this boilerplate is to save time thinking about certain basic structures common to any project to make an API without having to get everything from scratch. 
+The advantages of using this boilerplate are
+to save time thinking about certain basic structures common to any project to make an API
+without having to get everything from scratch. 
 
 As it is only a boilerplate, you have the freedom to structure the code whatever you want.
 

infrastructure/supabase_permissions.sql

@@ -0,0 +1,42 @@
+CREATE TABLE roles (
+  id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
+  name TEXT NOT NULL,
+  slug TEXT UNIQUE NOT NULL
+);
+
+CREATE TABLE permissions (
+  id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
+  name TEXT UNIQUE NOT NULL
+);
+
+CREATE TABLE users_has_roles (
+  user_id UUID NOT NULL,
+  role_id UUID NOT NULL,
+  PRIMARY KEY (user_id, role_id),
+  FOREIGN KEY (user_id) REFERENCES auth.users(id),
+  FOREIGN KEY (role_id) REFERENCES roles(id)
+);
+
+CREATE TABLE roles_has_permissions (
+  role_id UUID NOT NULL,
+  permission_id UUID NOT NULL,
+  PRIMARY KEY (role_id, permission_id),
+  FOREIGN KEY (role_id) REFERENCES roles(id),
+  FOREIGN KEY (permission_id) REFERENCES permissions(id)
+);
+
+CREATE OR REPLACE FUNCTION get_authorization(field_user_id UUID, permission_name TEXT) RETURNS BOOLEAN AS $$
+DECLARE
+    has_permission BOOLEAN;
+BEGIN
+    SELECT EXISTS (
+        SELECT 1
+        FROM users_has_roles uhr
+        JOIN roles_has_permissions rhp ON uhr.role_id = rhp.role_id
+        JOIN permissions p ON rhp.permission_id = p.id
+        WHERE uhr.user_id = field_user_id AND p.name = permission_name
+    ) INTO has_permission;
+
+    RETURN has_permission;
+END;
+$$ LANGUAGE plpgsql;