# Set a common group of  headers
add_header X-Content-Type-Options nosniff;
add_header X-XSS-Protection "1; mode=block";
add_header X-Robots-Tag none;
add_header Content-Security-Policy "frame-ancestors 'self'";
add_header X-Frame-Options DENY;
add_header Referrer-Policy same-origin;

# CORS Permissive
# Enable CORS for bsky.app
set $cors "";
if ($http_origin ~* "https?://(.*)\.bsky\.app") {
    set $cors $http_origin;
}

add_header 'Access-Control-Allow-Origin' $cors always;

add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS' always;
add_header 'Access-Control-Allow-Headers' 'Content-Type, Authorization' always;
add_header 'Access-Control-Allow-Credentials' 'true' always;

# Handle preflight OPTIONS requests
if ($request_method = 'OPTIONS') {
    add_header 'Access-Control-Allow-Origin' 'https://bsky.app' always;
    add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS' always;
    add_header 'Access-Control-Allow-Headers' 'Content-Type, Authorization' always;
    add_header 'Access-Control-Allow-Credentials' 'true' always;
    add_header 'Content-Length' 0;
    add_header 'Access-Control-Max-Age' 1728000;
    return 204;
}