include api_backends.conf;
include api_keys.conf;

limit_req_zone $binary_remote_addr zone=client_ip_10rs:1m rate=1r/s;
limit_req_zone $http_apikey        zone=apikey_200rs:1m   rate=200r/s;

server {
    access_log /var/log/nginx/api_access.log main; # Each API may also log to a 
                                                   # separate file

    listen 443 ssl;
    server_name api.example.com;

    # TLS config
    ssl_certificate      /etc/ssl/certs/api.example.com.crt;
    ssl_certificate_key  /etc/ssl/private/api.example.com.key;
    ssl_session_cache    shared:SSL:10m;
    ssl_session_timeout  5m;
    ssl_ciphers          HIGH:!aNULL:!MD5;
    ssl_protocols        TLSv1.2 TLSv1.3;

    # API definitions, one per file
    include api_conf.d/*.conf;

    # Error responses
    error_page 404 = @400;         # Invalid paths are treated as bad requests
    proxy_intercept_errors on;     # Do not send backend errors to the client
    include api_json_errors.conf;  # API client friendly JSON error responses
    default_type application/json; # If no content-type then assume JSON

    # API key validation
    location = /_validate_apikey {
        internal;

        if ($http_apikey = "") {
            return 401; # Unauthorized
        }
        if ($api_client_name = "") {
            return 403; # Forbidden
        }

        return 204; # OK (no content)
    }

    # Dummy location used to populate $request_body for JSON validation
    location /_get_request_body {
        return 204;
    }
}

js_import json_validation.js;
js_set $json_validated json_validation.parseRequestBody;

server {
    listen 127.0.0.1:10415;
    return 415; # Unsupported media type
    include api_json_errors.conf;
}

# Access to write operations is evaluated by JWT claim 'admin'
map $request_method $admin_permitted_method {
    "GET"     true;
    "HEAD"    true;
    "OPTIONS" true;
    default   $jwt_claim_admin;
}

# vim: syntax=nginx