export async function generateSecretKey() {
    const key = await crypto.subtle.generateKey(
        { name: "HMAC", hash: "SHA-512" },
        true,
        ["sign", "verify"],
      );
    
    return key;
}

export async function prepareSecretKey(){
    const key = Deno.env.get("SECRET_KEY");
    if (key){
        const jwk = JSON.parse(key) as JsonWebKey;
        {
            const key = await crypto.subtle.importKey("jwk", jwk, 
                { name: "HMAC", hash: "SHA-512" }, true, ["sign", "verify"]);
            return key;
        }
    }
    else {
        const key = await generateSecretKey();
        const out = await crypto.subtle.exportKey("jwk", key);
        Deno.env.set("SECRET_KEY", JSON.stringify(out));
        return key;
    }
}