sipher/supabase/sql_snippets/User Registration Policy.sql

-- Drop everything related to users
DROP TABLE IF EXISTS public.users CASCADE;

-- Create new users table
CREATE TABLE
    public.users
(
    uuid     UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    suuid    CHAR(8) UNIQUE NOT NULL,
    username TEXT UNIQUE    NOT NULL CHECK (
        length(username) >= 3
            AND username ~ '^[a-zA-Z0-9_-]+$'
) ,
    password TEXT NOT NULL CHECK (length(password) >= 8),
    indexable BOOLEAN DEFAULT false,
    created_at TIMESTAMP WITH TIME ZONE DEFAULT TIMEZONE ('utc'::text, NOW()) NOT NULL
  );

-- Create trigger function for SUUID generation
CREATE
OR REPLACE FUNCTION public.handle_new_user () RETURNS TRIGGER AS $$

BEGIN

   NEW.suuid
:= public.generate_short_uuid();

RETURN NEW;

END;

$$
LANGUAGE plpgsql;

-- Create the trigger
CREATE TRIGGER on_user_created
    BEFORE INSERT
    ON public.users
    FOR EACH ROW
    EXECUTE FUNCTION public.handle_new_user ();

-- Add policies
CREATE
POLICY "Users can view their own profile" ON public.users FOR
SELECT
    USING (auth.uid () = uuid);

CREATE
POLICY "Users can view indexable profiles" ON public.users FOR
SELECT
    USING (indexable = true);

CREATE
POLICY "Allow user registration" ON public.users FOR INSERT
WITH
  CHECK (true);

CREATE
POLICY "Users can update their own profile" ON public.users
FOR
UPDATE
    USING (auth.uid () = uuid);

-- Enable RLS
ALTER TABLE public.users ENABLE ROW LEVEL SECURITY;

-- Create index for better performance
CREATE INDEX idx_users_suuid ON public.users (suuid);

CREATE INDEX idx_users_indexable ON public.users (indexable) WHERE
  indexable = true;