# OPA Quickstart Guide [![Slack](https://slack.minio.io/slack?type=svg)](https://slack.minio.io)

OPA is a lightweight general-purpose policy engine that can be co-located with MinIO server, in this document we talk about how to use OPA HTTP API to authorize requests. It can be used with any type of credentials (STS based like OpenID or LDAP, regular IAM users or service accounts).

OPA is enabled through MinIO's Access Management Plugin feature.

## Get started

	Compression compress.Config `json:"compress"`

	// OpenID configuration
	OpenID openid.Config `json:"openid"`

	// External policy enforcements.
	Policy struct {
		// OPA configuration.
		OPA opa.Args `json:"opa"`

		// Add new external policy enforcements here.
	} `json:"policy"`

	LDAPServerConfig xldap.LegacyConfig `json:"ldapserverconfig"`

		cfg.Compression.MimeTypes = strings.Split(compress.DefaultMimeTypes, config.ValueSeparator)
	case "30":
		// V30 -> V31
		cfg.OpenID = openid.Config{}
		cfg.Policy.OPA = opa.Args{
			URL:       &xnet.URL{},
			AuthToken: "",
		}
	case "31":
		// V31 -> V32
		cfg.Notify.NSQ = make(map[string]target.NSQArgs)
		cfg.Notify.NSQ["1"] = target.NSQArgs{}
	}

	case config.PolicyOPASubSys:
		// In case legacy OPA config is being set, we treat it as if the
		// AuthZPlugin is being set.
		subSys = config.PolicyPluginSubSys
		fallthrough
	case config.PolicyPluginSubSys:
		if ppargs, err := polplugin.LookupConfig(s, GetDefaultConnSettings(), xhttp.DrainBody); err != nil {
			return err
		} else if ppargs.URL == nil {
			// Check if legacy opa is configured.

			} else {
				authZInit = true
			}
			if authZPluginCfg.URL == nil {
				opaCfg, err := opa.LookupConfig(s[config.PolicyOPASubSys][config.Default],
					NewHTTPTransport(), xhttp.DrainBody)
				if err != nil {
					iamLogIf(ctx, fmt.Errorf("Unable to initialize AuthZPlugin from legacy OPA config: %w", err))
				} else {
					authZPluginCfg.URL = opaCfg.URL
					authZPluginCfg.AuthToken = opaCfg.AuthToken

- github.com/moby/sys/sequential: [v0.5.0](https://github.com/moby/sys/tree/sequential/v0.5.0)
- github.com/open-policy-agent/opa: [v0.67.1](https://github.com/open-policy-agent/opa/tree/v0.67.1)
- github.com/pelletier/go-toml: [v1.9.5](https://github.com/pelletier/go-toml/tree/v1.9.5)
- github.com/rcrowley/go-metrics: [10cdbea](https://github.com/rcrowley/go-metrics/tree/10cdbea)