Implement Policy Enforcer Plugin

- Added a new Policy Enforcer plugin to evaluate incoming messages against OPA policies.
- Configurable via YAML with options for policy sources, actions, and query.
- Integrated into existing configuration files for BAP and BPP.
- Updated related tests and documentation for the new functionality.
- Enhanced plugin manager to support Policy Enforcer instantiation.

cmd/adapter/main_test.go

@@ -83,6 +83,11 @@ func (m *MockPluginManager) SchemaValidator(ctx context.Context, cfg *plugin.Con
 	return nil, nil
 }
 
+// PolicyEnforcer returns a mock implementation of the PolicyEnforcer interface.
+func (m *MockPluginManager) PolicyEnforcer(ctx context.Context, cfg *plugin.Config) (definition.PolicyEnforcer, error) {
+	return nil, nil
+}
+
 // mockRun is a mock implementation of the `run` function, simulating a successful run.
 func mockRun(ctx context.Context, configPath string) error {
 	return nil // Simulate a successful run

config/local-beckn-one-bap.yaml

@@ -86,6 +86,12 @@ modules:
           id: router
           config:
             routingConfig: ./config/local-beckn-one-routing-BAPReceiver.yaml
+        policyEnforcer:
+          id: policyenforcer
+          config:
+            policySources: "./policies/compliance.rego"
+            actions: "confirm"
+            query: "data.policy.violations"
         middleware:
           - id: reqpreprocessor
             config:
@@ -93,6 +99,7 @@ modules:
               role: bap
       steps:
         - validateSign
+        - enforcePolicy
         - addRoute
         - validateSchema
   

config/local-beckn-one-bpp.yaml

@@ -84,8 +84,15 @@ modules:
           id: router
           config:
             routingConfig: ./config/local-beckn-one-routing-BPPReceiver.yaml
+        policyEnforcer:
+          id: policyenforcer
+          config:
+            policySources: "./policies/compliance.rego"
+            actions: "confirm"
+            query: "data.policy.violations"
       steps:
         - validateSign
+        - enforcePolicy
         - addRoute
         - validateSchema
   

config/local-simple.yaml

@@ -66,6 +66,12 @@ modules:
           id: router
           config:
             routingConfig: ./config/local-simple-routing.yaml
+        policyEnforcer:
+          id: policyenforcer
+          config:
+            policySources: "./policies/compliance.rego"
+            actions: "confirm"
+            query: "data.policy.violations"
         middleware:
           - id: reqpreprocessor
             config:
@@ -73,6 +79,7 @@ modules:
               role: bap
       steps:
         - validateSign
+        - enforcePolicy
         - addRoute
   
   - name: bapTxnCaller
@@ -162,8 +169,15 @@ modules:
           id: router
           config:
             routingConfig: ./config/local-simple-routing-BPPReceiver.yaml
+        policyEnforcer:
+          id: policyenforcer
+          config:
+            policySources: "./policies/compliance.rego"
+            actions: "confirm"
+            query: "data.policy.violations"
       steps:
         - validateSign
+        - enforcePolicy
         - addRoute
   
   - name: bppTxnCaller

core/module/handler/config.go

@@ -19,6 +19,7 @@ type PluginManager interface {
 	Publisher(ctx context.Context, cfg *plugin.Config) (definition.Publisher, error)
 	Signer(ctx context.Context, cfg *plugin.Config) (definition.Signer, error)
 	Step(ctx context.Context, cfg *plugin.Config) (definition.Step, error)
+	PolicyEnforcer(ctx context.Context, cfg *plugin.Config) (definition.PolicyEnforcer, error)
 	Cache(ctx context.Context, cfg *plugin.Config) (definition.Cache, error)
 	Registry(ctx context.Context, cfg *plugin.Config) (definition.RegistryLookup, error)
 	KeyManager(ctx context.Context, cache definition.Cache, rLookup definition.RegistryLookup, cfg *plugin.Config) (definition.KeyManager, error)
@@ -37,6 +38,7 @@ const (
 // PluginCfg holds the configuration for various plugins.
 type PluginCfg struct {
 	SchemaValidator  *plugin.Config  `yaml:"schemaValidator,omitempty"`
+	PolicyEnforcer   *plugin.Config  `yaml:"policyEnforcer,omitempty"`
 	SignValidator    *plugin.Config  `yaml:"signValidator,omitempty"`
 	Publisher        *plugin.Config  `yaml:"publisher,omitempty"`
 	Signer           *plugin.Config  `yaml:"signer,omitempty"`

core/module/handler/stdHandler.go

@@ -35,6 +35,7 @@ type stdHandler struct {
 	registry         definition.RegistryLookup
 	km               definition.KeyManager
 	schemaValidator  definition.SchemaValidator
+	policyEnforcer   definition.PolicyEnforcer
 	router           definition.Router
 	publisher        definition.Publisher
 	transportWrapper definition.TransportWrapper
@@ -318,6 +319,9 @@ func (h *stdHandler) initPlugins(ctx context.Context, mgr PluginManager, cfg *Pl
 	if h.transportWrapper, err = loadPlugin(ctx, "TransportWrapper", cfg.TransportWrapper, mgr.TransportWrapper); err != nil {
 		return err
 	}
+	if h.policyEnforcer, err = loadPlugin(ctx, "PolicyEnforcer", cfg.PolicyEnforcer, mgr.PolicyEnforcer); err != nil {
+		return err
+	}
 
 	log.Debugf(ctx, "All required plugins successfully loaded for stdHandler")
 	return nil
@@ -350,6 +354,8 @@ func (h *stdHandler) initSteps(ctx context.Context, mgr PluginManager, cfg *Conf
 			s, err = newValidateSchemaStep(h.schemaValidator)
 		case "addRoute":
 			s, err = newAddRouteStep(h.router)
+		case "enforcePolicy":
+			s, err = newEnforcePolicyStep(h.policyEnforcer)
 		default:
 			if customStep, exists := steps[step]; exists {
 				s = customStep

core/module/handler/step.go

@@ -315,3 +315,11 @@ func extractSchemaVersion(body []byte) string {
 	}
 	return "unknown"
 }
+
+// newEnforcePolicyStep creates and returns the enforcePolicy step after validation.
+func newEnforcePolicyStep(policyEnforcer definition.PolicyEnforcer) (definition.Step, error) {
+	if policyEnforcer == nil {
+		return nil, fmt.Errorf("invalid config: PolicyEnforcer plugin not configured")
+	}
+	return policyEnforcer, nil
+}

core/module/module_test.go

@@ -79,6 +79,11 @@ func (m *mockPluginManager) SchemaValidator(ctx context.Context, cfg *plugin.Con
 	return nil, nil
 }
 
+// PolicyEnforcer returns a mock policy enforcer implementation.
+func (m *mockPluginManager) PolicyEnforcer(ctx context.Context, cfg *plugin.Config) (definition.PolicyEnforcer, error) {
+	return nil, nil
+}
+
 // TestRegisterSuccess tests scenarios where the handler registration should succeed.
 func TestRegisterSuccess(t *testing.T) {
 	mCfgs := []Config{

go.mod

@@ -1,6 +1,6 @@
 module github.com/beckn-one/beckn-onix
 
-go 1.24.0
+go 1.24.6
 
 require (
 	github.com/santhosh-tekuri/jsonschema/v6 v6.0.1
@@ -22,16 +22,20 @@ require github.com/zenazn/pkcs7pad v0.0.0-20170308005700-253a5b1f0e03
 require golang.org/x/text v0.33.0 // indirect
 
 require (
+	github.com/agnivade/levenshtein v1.2.1 // indirect
 	github.com/beorn7/perks v1.0.1 // indirect
 	github.com/cenkalti/backoff/v4 v4.3.0 // indirect
 	github.com/cenkalti/backoff/v5 v5.0.3 // indirect
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect
+	github.com/decred/dcrd/dcrec/secp256k1/v4 v4.4.0 // indirect
 	github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f // indirect
 	github.com/go-jose/go-jose/v4 v4.1.3 // indirect
 	github.com/go-logr/logr v1.4.3 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
 	github.com/go-openapi/jsonpointer v0.21.0 // indirect
 	github.com/go-openapi/swag v0.23.0 // indirect
+	github.com/gobwas/glob v0.2.3 // indirect
+	github.com/goccy/go-json v0.10.5 // indirect
 	github.com/grpc-ecosystem/grpc-gateway/v2 v2.27.7 // indirect
 	github.com/hashicorp/errwrap v1.1.0 // indirect
 	github.com/hashicorp/go-multierror v1.1.1 // indirect
@@ -41,33 +45,52 @@ require (
 	github.com/hashicorp/go-sockaddr v1.0.2 // indirect
 	github.com/hashicorp/hcl v1.0.0 // indirect
 	github.com/josharian/intern v1.0.0 // indirect
+	github.com/lestrrat-go/blackmagic v1.0.4 // indirect
+	github.com/lestrrat-go/dsig v1.0.0 // indirect
+	github.com/lestrrat-go/dsig-secp256k1 v1.0.0 // indirect
+	github.com/lestrrat-go/httpcc v1.0.1 // indirect
+	github.com/lestrrat-go/httprc/v3 v3.0.2 // indirect
+	github.com/lestrrat-go/jwx/v3 v3.0.13 // indirect
+	github.com/lestrrat-go/option/v2 v2.0.0 // indirect
 	github.com/mailru/easyjson v0.7.7 // indirect
 	github.com/mattn/go-colorable v0.1.13 // indirect
 	github.com/mattn/go-isatty v0.0.20 // indirect
-	github.com/matttproud/golang_protobuf_extensions/v2 v2.0.0 // indirect
 	github.com/mitchellh/go-homedir v1.1.0 // indirect
 	github.com/mitchellh/mapstructure v1.5.0 // indirect
 	github.com/mohae/deepcopy v0.0.0-20170929034955-c48cc78d4826 // indirect
+	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
 	github.com/oasdiff/yaml v0.0.0-20250309154309-f31be36b4037 // indirect
 	github.com/oasdiff/yaml3 v0.0.0-20250309153720-d2182401db90 // indirect
 	github.com/perimeterx/marshmallow v1.1.5 // indirect
-	github.com/prometheus/client_model v0.6.0 // indirect
+	github.com/prometheus/client_model v0.6.2 // indirect
-	github.com/prometheus/common v0.45.0 // indirect
+	github.com/prometheus/common v0.66.1 // indirect
-	github.com/prometheus/procfs v0.12.0 // indirect
+	github.com/prometheus/procfs v0.17.0 // indirect
+	github.com/rcrowley/go-metrics v0.0.0-20250401214520-65e299d6c5c9 // indirect
 	github.com/redis/go-redis/extra/rediscmd/v9 v9.16.0 // indirect
 	github.com/ryanuber/go-glob v1.0.0 // indirect
+	github.com/segmentio/asm v1.2.1 // indirect
+	github.com/sirupsen/logrus v1.9.4 // indirect
+	github.com/tchap/go-patricia/v2 v2.3.3 // indirect
+	github.com/valyala/fastjson v1.6.7 // indirect
+	github.com/vektah/gqlparser/v2 v2.5.31 // indirect
 	github.com/woodsbury/decimal128 v1.3.0 // indirect
+	github.com/xeipuuv/gojsonpointer v0.0.0-20190905194746-02993c407bfb // indirect
+	github.com/xeipuuv/gojsonreference v0.0.0-20180127040603-bd5ef7bd5415 // indirect
+	github.com/yashtewari/glob-intersection v0.2.0 // indirect
 	go.opentelemetry.io/auto/sdk v1.2.1 // indirect
-	go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc v0.16.0 // indirect
 	go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.39.0 // indirect
-	go.opentelemetry.io/otel/log v0.16.0 // indirect
 	go.opentelemetry.io/proto/otlp v1.9.0 // indirect
+	go.yaml.in/yaml/v2 v2.4.2 // indirect
+	go.yaml.in/yaml/v3 v3.0.4 // indirect
 	golang.org/x/net v0.49.0 // indirect
+	golang.org/x/sync v0.19.0 // indirect
 	golang.org/x/sys v0.40.0 // indirect
-	golang.org/x/time v0.0.0-20200416051211-89c76fbcd5d1 // indirect
+	golang.org/x/time v0.14.0 // indirect
 	google.golang.org/genproto/googleapis/api v0.0.0-20260128011058-8636f8732409 // indirect
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20260128011058-8636f8732409 // indirect
 	google.golang.org/protobuf v1.36.11 // indirect
+	gopkg.in/ini.v1 v1.67.1 // indirect
+	sigs.k8s.io/yaml v1.6.0 // indirect
 )
 
 require (
@@ -76,16 +99,19 @@ require (
 	github.com/hashicorp/go-retryablehttp v0.7.7
 	github.com/hashicorp/vault/api v1.16.0
 	github.com/jsonata-go/jsonata v0.0.0-20250709164031-599f35f32e5f
-	github.com/prometheus/client_golang v1.18.0
+	github.com/open-policy-agent/opa v1.13.2
+	github.com/prometheus/client_golang v1.23.2
 	github.com/rabbitmq/amqp091-go v1.10.0
 	github.com/redis/go-redis/extra/redisotel/v9 v9.16.0
 	github.com/redis/go-redis/v9 v9.16.0
 	github.com/rs/zerolog v1.34.0
 	go.opentelemetry.io/contrib/instrumentation/runtime v0.64.0
 	go.opentelemetry.io/otel v1.40.0
+	go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc v0.16.0
 	go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc v1.39.0
 	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.39.0
 	go.opentelemetry.io/otel/exporters/prometheus v0.46.0
+	go.opentelemetry.io/otel/log v0.16.0
 	go.opentelemetry.io/otel/metric v1.40.0
 	go.opentelemetry.io/otel/sdk v1.40.0
 	go.opentelemetry.io/otel/sdk/log v0.16.0

go.sum

@@ -1,3 +1,9 @@
+github.com/agnivade/levenshtein v1.2.1 h1:EHBY3UOn1gwdy/VbFwgo4cxecRznFk7fKWN1KOX7eoM=
+github.com/agnivade/levenshtein v1.2.1/go.mod h1:QVVI16kDrtSuwcpd0p1+xMC6Z/VfhtCyDIjcwga4/DU=
+github.com/andreyvit/diff v0.0.0-20170406064948-c7f18ee00883 h1:bvNMNQO63//z+xNgfBlViaCIJKLlCJ6/fmUseuG0wVQ=
+github.com/andreyvit/diff v0.0.0-20170406064948-c7f18ee00883/go.mod h1:rCTlJbsFo29Kk6CurOXKm700vrz8f0KW0JNfpkRJY/8=
+github.com/arbovm/levenshtein v0.0.0-20160628152529-48b4e1c0c4d0 h1:jfIu9sQUG6Ig+0+Ap1h4unLjW6YQJpKZVmUzxsD4E/Q=
+github.com/arbovm/levenshtein v0.0.0-20160628152529-48b4e1c0c4d0/go.mod h1:t2tdKJDJF9BV14lnkjHmOQgcvEKgtqs5a1N3LNdJhGE=
 github.com/armon/go-radix v0.0.0-20180808171621-7fddfc383310/go.mod h1:ufUuZ+zHj4x4TnLV4JWEpy2hxWSpsRywHrMgIH9cCH8=
 github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
 github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
@@ -6,6 +12,8 @@ github.com/bsm/ginkgo/v2 v2.12.0 h1:Ny8MWAHyOepLGlLKYmXG4IEkioBysk6GpaRTLC8zwWs=
 github.com/bsm/ginkgo/v2 v2.12.0/go.mod h1:SwYbGRRDovPVboqFv0tPTcG1sN61LM1Z4ARdbAV9g4c=
 github.com/bsm/gomega v1.27.10 h1:yeMWxP2pV2fG3FgAODIY8EiRE3dy0aeFYt4l7wh6yKA=
 github.com/bsm/gomega v1.27.10/go.mod h1:JyEr/xRbxbtgWNi8tIEVPUYZ5Dzef52k01W3YH0H+O0=
+github.com/bytecodealliance/wasmtime-go/v39 v39.0.1 h1:RibaT47yiyCRxMOj/l2cvL8cWiWBSqDXHyqsa9sGcCE=
+github.com/bytecodealliance/wasmtime-go/v39 v39.0.1/go.mod h1:miR4NYIEBXeDNamZIzpskhJ0z/p8al+lwMWylQ/ZJb4=
 github.com/cenkalti/backoff/v4 v4.3.0 h1:MyRJ/UdXutAwSAT+s3wNd7MfTIcy71VQueUuFK343L8=
 github.com/cenkalti/backoff/v4 v4.3.0/go.mod h1:Y3VNntkOUPxTVeUxJ/G5vcM//AlwfmyYozVcomhLiZE=
 github.com/cenkalti/backoff/v5 v5.0.3 h1:ZN+IMa753KfX5hd8vVaMixjnqRZ3y8CuJKRKj1xcsSM=
@@ -17,13 +25,29 @@ github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSs
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc h1:U9qPSI2PIWSS1VwoXQT9A3Wy9MM3WgvqSxFWenqJduM=
 github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/decred/dcrd/dcrec/secp256k1/v4 v4.4.0 h1:NMZiJj8QnKe1LgsbDayM4UoHwbvwDRwnI3hwNaAHRnc=
+github.com/decred/dcrd/dcrec/secp256k1/v4 v4.4.0/go.mod h1:ZXNYxsqcloTdSy/rNShjYzMhyjf0LaoftYK0p+A3h40=
+github.com/dgraph-io/badger/v4 v4.9.0 h1:tpqWb0NewSrCYqTvywbcXOhQdWcqephkVkbBmaaqHzc=
+github.com/dgraph-io/badger/v4 v4.9.0/go.mod h1:5/MEx97uzdPUHR4KtkNt8asfI2T4JiEiQlV7kWUo8c0=
+github.com/dgraph-io/ristretto/v2 v2.2.0 h1:bkY3XzJcXoMuELV8F+vS8kzNgicwQFAaGINAEJdWGOM=
+github.com/dgraph-io/ristretto/v2 v2.2.0/go.mod h1:RZrm63UmcBAaYWC1DotLYBmTvgkrs0+XhBd7Npn7/zI=
 github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f h1:lO4WD4F/rVNCu3HqELle0jiPLLBs70cWOduZpkS1E78=
 github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f/go.mod h1:cuUVRXasLTGF7a8hSLbxyZXjz+1KgoB3wDUb6vlszIc=
+github.com/dgryski/trifles v0.0.0-20230903005119-f50d829f2e54 h1:SG7nF6SRlWhcT7cNTs5R6Hk4V2lcmLz2NsG2VnInyNo=
+github.com/dgryski/trifles v0.0.0-20230903005119-f50d829f2e54/go.mod h1:if7Fbed8SFyPtHLHbg49SI7NAdJiC5WIA09pe59rfAA=
 github.com/dlclark/regexp2 v1.11.0 h1:G/nrcoOa7ZXlpoa/91N3X7mM3r8eIlMBBJZvsz/mxKI=
 github.com/dlclark/regexp2 v1.11.0/go.mod h1:DHkYz0B9wPfa6wondMfaivmHpzrQ3v9q8cnmRbL6yW8=
+github.com/dustin/go-humanize v1.0.1 h1:GzkhY7T5VNhEkwH0PVJgjz+fX1rhBrR7pRT3mDkpeCY=
+github.com/dustin/go-humanize v1.0.1/go.mod h1:Mu1zIs6XwVuF/gI1OepvI0qD18qycQx+mFykh5fBlto=
 github.com/fatih/color v1.7.0/go.mod h1:Zm6kSWBoL9eyXnKyktHP6abPY2pDugNf5KwzbycvMj4=
 github.com/fatih/color v1.16.0 h1:zmkK9Ngbjj+K0yRhTVONQh1p/HknKYSlNT+vZCzyokM=
 github.com/fatih/color v1.16.0/go.mod h1:fL2Sau1YI5c0pdGEVCbKQbLXB6edEj1ZgiY4NijnWvE=
+github.com/felixge/httpsnoop v1.0.4 h1:NFTV2Zj1bL4mc9sqWACXbQFVBBg2W3GPvqp8/ESS2Wg=
+github.com/felixge/httpsnoop v1.0.4/go.mod h1:m8KPJKqk1gH5J9DgRY2ASl2lWCfGKXixSwevea8zH2U=
+github.com/fortytw2/leaktest v1.3.0 h1:u8491cBMTQ8ft8aeV+adlcytMZylmA5nnwwkRZjI8vw=
+github.com/fortytw2/leaktest v1.3.0/go.mod h1:jDsjWgpAGjm2CA7WthBh/CdZYEPF31XHquHwclZch5g=
+github.com/foxcpp/go-mockdns v1.2.0 h1:omK3OrHRD1IWJz1FuFBCFquhXslXoF17OvBS6JPzZF0=
+github.com/foxcpp/go-mockdns v1.2.0/go.mod h1:IhLeSFGed3mJIAXPH2aiRQB+kqz7oqu8ld2qVbOu7Wk=
 github.com/getkin/kin-openapi v0.133.0 h1:pJdmNohVIJ97r4AUFtEXRXwESr8b0bD721u/Tz6k8PQ=
 github.com/getkin/kin-openapi v0.133.0/go.mod h1:boAciF6cXk5FhPqe/NQeBTeenbjqU4LhWBf09ILVvWE=
 github.com/go-jose/go-jose/v4 v4.1.3 h1:CVLmWDhDVRa6Mi/IgCgaopNosCaHz7zrMeF9MlZRkrs=
@@ -39,15 +63,19 @@ github.com/go-openapi/swag v0.23.0 h1:vsEVJDUo2hPJ2tu0/Xc+4noaxyEffXNIs3cOULZ+Gr
 github.com/go-openapi/swag v0.23.0/go.mod h1:esZ8ITTYEsH1V2trKHjAN8Ai7xHb8RV+YSZ577vPjgQ=
 github.com/go-test/deep v1.0.8 h1:TDsG77qcSprGbC6vTN8OuXp5g+J+b5Pcguhf7Zt61VM=
 github.com/go-test/deep v1.0.8/go.mod h1:5C2ZWiW0ErCdrYzpqxLbTX7MG14M9iiw8DgHncVwcsE=
+github.com/gobwas/glob v0.2.3 h1:A4xDbljILXROh+kObIiy5kIaPYD8e96x1tgBhUI5J+Y=
+github.com/gobwas/glob v0.2.3/go.mod h1:d3Ez4x06l9bZtSvzIay5+Yzi0fmZzPgnTbPcKjJAkT8=
+github.com/goccy/go-json v0.10.5 h1:Fq85nIqj+gXn/S5ahsiTlK3TmC85qgirsdTP/+DeaC4=
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+github.com/yashtewari/glob-intersection v0.2.0/go.mod h1:LK7pIC3piUjovexikBbJ26Yml7g8xa5bsjfx2v1fwok=
 github.com/zenazn/pkcs7pad v0.0.0-20170308005700-253a5b1f0e03 h1:m1h+vudopHsI67FPT9MOncyndWhTcdUoBtI1R1uajGY=
 github.com/zenazn/pkcs7pad v0.0.0-20170308005700-253a5b1f0e03/go.mod h1:8sheVFH84v3PCyFY/O02mIgSQY9I6wMYPWsq7mDnEZY=
 go.opentelemetry.io/auto/sdk v1.2.1 h1:jXsnJ4Lmnqd11kwkBV2LgLoFMZKizbCi5fNZ/ipaZ64=
 go.opentelemetry.io/auto/sdk v1.2.1/go.mod h1:KRTj+aOaElaLi+wW1kO/DZRXwkF4C5xPbEe3ZiIhN7Y=
+go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.64.0 h1:ssfIgGNANqpVFCndZvcuyKbl0g+UAVcbBcqGkG28H0Y=
+go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.64.0/go.mod h1:GQ/474YrbE4Jx8gZ4q5I4hrhUzM6UPzyrqJYV2AqPoQ=
 go.opentelemetry.io/contrib/instrumentation/runtime v0.64.0 h1:/+/+UjlXjFcdDlXxKL1PouzX8Z2Vl0OxolRKeBEgYDw=
 go.opentelemetry.io/contrib/instrumentation/runtime v0.64.0/go.mod h1:Ldm/PDuzY2DP7IypudopCR3OCOW42NJlN9+mNEroevo=
 go.opentelemetry.io/otel v1.40.0 h1:oA5YeOcpRTXq6NN7frwmwFR0Cn3RhTVZvXsP4duvCms=
@@ -169,6 +246,8 @@ go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.39.0 h1:f0cb2XPmrqn4XMy9PNl
 go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.39.0/go.mod h1:vnakAaFckOMiMtOIhFI2MNH4FYrZzXCYxmb1LlhoGz8=
 go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.39.0 h1:in9O8ESIOlwJAEGTkkf34DesGRAc/Pn8qJ7k3r/42LM=
 go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.39.0/go.mod h1:Rp0EXBm5tfnv0WL+ARyO/PHBEaEAT8UUHQ6AGJcSq6c=
+go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.39.0 h1:Ckwye2FpXkYgiHX7fyVrN1uA/UYd9ounqqTuSNAv0k4=
+go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.39.0/go.mod h1:teIFJh5pW2y+AN7riv6IBPX2DuesS3HgP39mwOspKwU=
 go.opentelemetry.io/otel/exporters/prometheus v0.46.0 h1:I8WIFXR351FoLJYuloU4EgXbtNX2URfU/85pUPheIEQ=
 go.opentelemetry.io/otel/exporters/prometheus v0.46.0/go.mod h1:ztwVUHe5DTR/1v7PeuGRnU5Bbd4QKYwApWmuutKsJSs=
 go.opentelemetry.io/otel/log v0.16.0 h1:DeuBPqCi6pQwtCK0pO4fvMB5eBq6sNxEnuTs88pjsN4=
@@ -179,6 +258,8 @@ go.opentelemetry.io/otel/sdk v1.40.0 h1:KHW/jUzgo6wsPh9At46+h4upjtccTmuZCFAc9OJ7
 go.opentelemetry.io/otel/sdk v1.40.0/go.mod h1:Ph7EFdYvxq72Y8Li9q8KebuYUr2KoeyHx0DRMKrYBUE=
 go.opentelemetry.io/otel/sdk/log v0.16.0 h1:e/b4bdlQwC5fnGtG3dlXUrNOnP7c8YLVSpSfEBIkTnI=
 go.opentelemetry.io/otel/sdk/log v0.16.0/go.mod h1:JKfP3T6ycy7QEuv3Hj8oKDy7KItrEkus8XJE6EoSzw4=
+go.opentelemetry.io/otel/sdk/log/logtest v0.16.0 h1:/XVkpZ41rVRTP4DfMgYv1nEtNmf65XPPyAdqV90TMy4=
+go.opentelemetry.io/otel/sdk/log/logtest v0.16.0/go.mod h1:iOOPgQr5MY9oac/F5W86mXdeyWZGleIx3uXO98X2R6Y=
 go.opentelemetry.io/otel/sdk/metric v1.40.0 h1:mtmdVqgQkeRxHgRv4qhyJduP3fYJRMX4AtAlbuWdCYw=
 go.opentelemetry.io/otel/sdk/metric v1.40.0/go.mod h1:4Z2bGMf0KSK3uRjlczMOeMhKU2rhUqdWNoKcYrtcBPg=
 go.opentelemetry.io/otel/trace v1.40.0 h1:WA4etStDttCSYuhwvEa8OP8I5EWu24lkOzp+ZYblVjw=
@@ -189,47 +270,45 @@ go.uber.org/automaxprocs v1.6.0 h1:O3y2/QNTOdbF+e/dpXNNW7Rx2hZ4sTIPyybbxyNqTUs=
 go.uber.org/automaxprocs v1.6.0/go.mod h1:ifeIMSnPZuznNm6jmdzmU3/bfk01Fe2fotchwEFJ8r8=
 go.uber.org/goleak v1.3.0 h1:2K3zAYmnTNqV73imy9J1T3WC+gmCePx2hEGkimedGto=
 go.uber.org/goleak v1.3.0/go.mod h1:CoHD4mav9JJNrW/WLlf7HGZPjdw8EucARQHekz1X6bE=
-golang.org/x/crypto v0.44.0 h1:A97SsFvM3AIwEEmTBiaxPPTYpDC47w720rdiiUvgoAU=
+go.yaml.in/yaml/v2 v2.4.2 h1:DzmwEr2rDGHl7lsFgAHxmNz/1NlQ7xLIrlN2h5d1eGI=
-golang.org/x/crypto v0.44.0/go.mod h1:013i+Nw79BMiQiMsOPcVCB5ZIJbYkerPrGnOa00tvmc=
+go.yaml.in/yaml/v2 v2.4.2/go.mod h1:081UH+NErpNdqlCXm3TtEran0rJZGxAYx9hb/ELlsPU=
+go.yaml.in/yaml/v3 v3.0.4 h1:tfq32ie2Jv2UxXFdLJdh3jXuOzWiL1fo0bu/FbuKpbc=
+go.yaml.in/yaml/v3 v3.0.4/go.mod h1:DhzuOOF2ATzADvBadXxruRBLzYTpT36CKvDb3+aBEFg=
 golang.org/x/crypto v0.47.0 h1:V6e3FRj+n4dbpw86FJ8Fv7XVOql7TEwpHapKoMJ/GO8=
 golang.org/x/crypto v0.47.0/go.mod h1:ff3Y9VzzKbwSSEzWqJsJVBnWmRwRSHt/6Op5n9bQc4A=
-golang.org/x/net v0.47.0 h1:Mx+4dIFzqraBXUugkia1OOvlD6LemFo1ALMHjrXDOhY=
+golang.org/x/mod v0.31.0 h1:HaW9xtz0+kOcWKwli0ZXy79Ix+UW/vOfmWI5QVd2tgI=
-golang.org/x/net v0.47.0/go.mod h1:/jNxtkgq5yWUGYkaZGqo27cfGZ1c5Nen03aYrrKpVRU=
+golang.org/x/mod v0.31.0/go.mod h1:43JraMp9cGx1Rx3AqioxrbrhNsLl2l/iNAvuBkrezpg=
 golang.org/x/net v0.49.0 h1:eeHFmOGUTtaaPSGNmjBKpbng9MulQsJURQUAfUwY++o=
 golang.org/x/net v0.49.0/go.mod h1:/ysNB2EvaqvesRkuLAyjI1ycPZlQHM3q01F02UY/MV8=
+golang.org/x/sync v0.19.0 h1:vV+1eWNmZ5geRlYjzm2adRgW2/mcpevXNg50YZtPCE4=
+golang.org/x/sync v0.19.0/go.mod h1:9KTHXmSnoGruLpwFjVSX0lNNA75CykiMECbovNTZqGI=
 golang.org/x/sys v0.0.0-20180823144017-11551d06cbcc/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.12.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.40.0 h1:DBZZqJ2Rkml6QMQsZywtnjnnGvHza6BTfYFWY9kjEWQ=
 golang.org/x/sys v0.40.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks=
-golang.org/x/text v0.31.0 h1:aC8ghyu4JhP8VojJ2lEHBnochRno1sgL6nEi9WGFGMM=
-golang.org/x/text v0.31.0/go.mod h1:tKRAlv61yKIjGGHX/4tP1LTbc13YSec1pxVEWXzfoeM=
 golang.org/x/text v0.33.0 h1:B3njUFyqtHDUI5jMn1YIr5B0IE2U0qck04r6d4KPAxE=
 golang.org/x/text v0.33.0/go.mod h1:LuMebE6+rBincTi9+xWTY8TztLzKHc/9C1uBCG27+q8=
-golang.org/x/time v0.0.0-20200416051211-89c76fbcd5d1 h1:NusfzzA6yGQ+ua51ck7E3omNUX/JuqbFSaRGqU8CcLI=
+golang.org/x/time v0.14.0 h1:MRx4UaLrDotUKUdCIqzPC48t1Y9hANFKIRpNx+Te8PI=
-golang.org/x/time v0.0.0-20200416051211-89c76fbcd5d1/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
+golang.org/x/time v0.14.0/go.mod h1:eL/Oa2bBBK0TkX57Fyni+NgnyQQN4LitPmob2Hjnqw4=
+golang.org/x/tools v0.40.0 h1:yLkxfA+Qnul4cs9QA3KnlFu0lVmd8JJfoq+E41uSutA=
+golang.org/x/tools v0.40.0/go.mod h1:Ik/tzLRlbscWpqqMRjyWYDisX8bG13FrdXp3o4Sr9lc=
 gonum.org/v1/gonum v0.16.0 h1:5+ul4Swaf3ESvrOnidPp4GZbzf0mxVQpDCYUQE7OJfk=
 gonum.org/v1/gonum v0.16.0/go.mod h1:fef3am4MQ93R2HHpKnLk4/Tbh/s0+wqD5nfa6Pnwy4E=
-google.golang.org/genproto/googleapis/api v0.0.0-20251202230838-ff82c1b0f217 h1:fCvbg86sFXwdrl5LgVcTEvNC+2txB5mgROGmRL5mrls=
-google.golang.org/genproto/googleapis/api v0.0.0-20251202230838-ff82c1b0f217/go.mod h1:+rXWjjaukWZun3mLfjmVnQi18E1AsFbDN9QdJ5YXLto=
 google.golang.org/genproto/googleapis/api v0.0.0-20260128011058-8636f8732409 h1:merA0rdPeUV3YIIfHHcH4qBkiQAc1nfCKSI7lB4cV2M=
 google.golang.org/genproto/googleapis/api v0.0.0-20260128011058-8636f8732409/go.mod h1:fl8J1IvUjCilwZzQowmw2b7HQB2eAuYBabMXzWurF+I=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20251202230838-ff82c1b0f217 h1:gRkg/vSppuSQoDjxyiGfN4Upv/h/DQmIR10ZU8dh4Ww=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20251202230838-ff82c1b0f217/go.mod h1:7i2o+ce6H/6BluujYR+kqX3GKH+dChPTQU19wjRPiGk=
 google.golang.org/genproto/googleapis/rpc v0.0.0-20260128011058-8636f8732409 h1:H86B94AW+VfJWDqFeEbBPhEtHzJwJfTbgE2lZa54ZAQ=
 google.golang.org/genproto/googleapis/rpc v0.0.0-20260128011058-8636f8732409/go.mod h1:j9x/tPzZkyxcgEFkiKEEGxfvyumM01BEtsW8xzOahRQ=
-google.golang.org/grpc v1.77.0 h1:wVVY6/8cGA6vvffn+wWK5ToddbgdU3d8MNENr4evgXM=
-google.golang.org/grpc v1.77.0/go.mod h1:z0BY1iVj0q8E1uSQCjL9cppRj+gnZjzDnzV0dHhrNig=
 google.golang.org/grpc v1.78.0 h1:K1XZG/yGDJnzMdd/uZHAkVqJE+xIDOcmdSFZkBUicNc=
 google.golang.org/grpc v1.78.0/go.mod h1:I47qjTo4OKbMkjA/aOOwxDIiPSBofUtQUI5EfpWvW7U=
-google.golang.org/protobuf v1.36.10 h1:AYd7cD/uASjIL6Q9LiTjz8JLcrh/88q5UObnmY3aOOE=
-google.golang.org/protobuf v1.36.10/go.mod h1:HTf+CrKn2C3g5S8VImy6tdcUvCska2kB7j23XfzDpco=
 google.golang.org/protobuf v1.36.11 h1:fV6ZwhNocDyBLK0dj+fg8ektcVegBBuEolpbTQyBNVE=
 google.golang.org/protobuf v1.36.11/go.mod h1:HTf+CrKn2C3g5S8VImy6tdcUvCska2kB7j23XfzDpco=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
+gopkg.in/ini.v1 v1.67.1 h1:tVBILHy0R6e4wkYOn3XmiITt/hEVH4TFMYvAX2Ytz6k=
+gopkg.in/ini.v1 v1.67.1/go.mod h1:x/cyOwCgZqOkJoDIJ3c1KNHMo10+nLGAhh+kn3Zizss=
 gopkg.in/natefinch/lumberjack.v2 v2.2.1 h1:bBRl1b0OH9s/DuPhuXpNl+VtCaJXFZ5/uEFST95x9zc=
 gopkg.in/natefinch/lumberjack.v2 v2.2.1/go.mod h1:YD8tP3GAjkrDg1eZH7EGmyESg/lsYskCTPBJVb9jqSc=
 gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
@@ -237,3 +316,5 @@ gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+sigs.k8s.io/yaml v1.6.0 h1:G8fkbMSAFqgEFgh4b1wmtzDnioxFCUgTZhlbj5P9QYs=
+sigs.k8s.io/yaml v1.6.0/go.mod h1:796bPqUfzR/0jLAl6XjHl3Ck7MiyVv8dbTdyT3/pMf4=

install/build-plugins.sh

@@ -23,6 +23,7 @@ plugins=(
     "schemav2validator"
     "signer"
     "signvalidator"
+    "policyenforcer"
 )
 
 for plugin in "${plugins[@]}"; do

install/docker-compose-adapter-beckn-one.yml

@@ -36,6 +36,7 @@ services:
     volumes:
       - ../config:/app/config
       - ../schemas:/app/schemas
+      - ../policies:/app/policies
     command: ["./server", "--config=/app/config/local-beckn-one-bap.yaml"]
 
   onix-bpp:
@@ -57,6 +58,7 @@ services:
     volumes:
       - ../config:/app/config
       - ../schemas:/app/schemas
+      - ../policies:/app/policies
     command: ["./server", "--config=/app/config/local-beckn-one-bpp.yaml"]
 
   sandbox-bap:

install/docker-compose-adapter.yml

@@ -36,6 +36,7 @@ services:
     volumes:
       - ../config:/app/config
       - ../schemas:/app/schemas
+      - ../policies:/app/policies
     command: ["./server", "--config=/app/config/local-simple.yaml"]
 
   # Vault - Key Management Service

pkg/plugin/definition/policyEnforcer.go

@@ -0,0 +1,17 @@
+package definition
+
+import (
+	"context"
+
+	"github.com/beckn-one/beckn-onix/pkg/model"
+)
+
+// PolicyEnforcer interface for policy enforcement on incoming messages.
+type PolicyEnforcer interface {
+	Run(ctx *model.StepContext) error
+}
+
+// PolicyEnforcerProvider interface for creating policy enforcers.
+type PolicyEnforcerProvider interface {
+	New(ctx context.Context, config map[string]string) (PolicyEnforcer, func(), error)
+}

pkg/plugin/implementation/policyenforcer/README.md

@@ -0,0 +1,68 @@
+# Policy Enforcer Plugin
+
+OPA/Rego-based policy enforcement for beckn-onix adapters. Evaluates incoming beckn messages against configurable policies and NACKs non-compliant requests.
+
+## Overview
+
+The `policyenforcer` plugin is a **Step plugin** that:
+- Loads `.rego` policy files from local directories, files, URLs, or local paths
+- Evaluates incoming messages against compiled OPA policies
+- Returns a `BadReqErr` (NACK) when policy violations are detected
+- Fails closed on evaluation errors (treats as NACK)
+- Is strictly **opt-in** — adapters that don't reference it are unaffected
+
+## Configuration
+
+All config keys are passed via `map[string]string` in the adapter YAML config.
+
+| Key | Required | Default | Description |
+|-----|----------|---------|-------------|
+| `policyDir` | One of `policyDir`, `policyFile`, or `policyUrls` required | — | Local directory containing `.rego` files |
+| `policyFile` | | — | Single local `.rego` file path |
+| `policyUrls` | | — | Comma-separated list of URLs or local paths to `.rego` files |
+| `query` | No | `data.policy.violations` | Rego query returning violation strings |
+| `actions` | No | `confirm` | Comma-separated beckn actions to enforce |
+| `enabled` | No | `true` | Enable/disable the plugin |
+| `debugLogging` | No | `false` | Enable verbose logging |
+| *any other key* | No | — | Forwarded to Rego as `data.config.<key>` |
+
+### Policy URLs
+
+`policyUrls` accepts both remote URLs and local file paths, separated by commas:
+
+```yaml
+config:
+  policyUrls: "https://policies.example.com/compliance.rego,/etc/policies/local.rego,https://policies.example.com/safety.rego"
+```
+
+### Air-Gapped Deployments
+
+For environments without internet access, replace any URL with a local file path or volume mount:
+
+```yaml
+config:
+  policyUrls: "/mounted-policies/compliance.rego,/mounted-policies/safety.rego"
+```
+
+## Example Config
+
+```yaml
+plugins:
+  steps:
+    - id: policyenforcer
+      config:
+        policyUrls: "https://policies.example.com/compliance.rego,/local/policies/safety.rego"
+        actions: "confirm,init"
+        query: "data.policy.violations"
+        minDeliveryLeadHours: "4"
+        debugLogging: "true"
+```
+
+## Relationship with Schema Validator
+
+`policyenforcer` and `schemavalidator`/`schemav2validator` are **separate plugins** with different responsibilities:
+
+- **Schema Validator**: Validates message **structure** against OpenAPI/JSON Schema specs
+- **Policy Enforcer**: Evaluates **business rules** via OPA/Rego policies
+
+They use different plugin interfaces (`SchemaValidator` vs `Step`), different engines, and different error types. Configure them side-by-side in your adapter config as needed.

pkg/plugin/implementation/policyenforcer/cmd/plugin.go

@@ -0,0 +1,26 @@
+// Package main provides the plugin entry point for the Policy Enforcer plugin.
+// This file is compiled as a Go plugin (.so) and loaded by beckn-onix at runtime.
+package main
+
+import (
+	"context"
+
+	"github.com/beckn-one/beckn-onix/pkg/plugin/definition"
+	"github.com/beckn-one/beckn-onix/pkg/plugin/implementation/policyenforcer"
+)
+
+// provider implements the PolicyEnforcerProvider interface for plugin loading.
+type provider struct{}
+
+// New creates a new PolicyEnforcer instance.
+func (p provider) New(ctx context.Context, cfg map[string]string) (definition.PolicyEnforcer, func(), error) {
+	enforcer, err := policyenforcer.New(cfg)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	return enforcer, enforcer.Close, nil
+}
+
+// Provider is the exported symbol that beckn-onix plugin manager looks up.
+var Provider = provider{}

pkg/plugin/implementation/policyenforcer/config.go

@@ -0,0 +1,129 @@
+package policyenforcer
+
+import (
+	"fmt"
+	"strings"
+)
+
+// Config holds the configuration for the Policy Enforcer plugin.
+type Config struct {
+	// PolicyDir is a local directory containing .rego policy files (all loaded).
+	// At least one policy source (PolicyDir, PolicyFile, or PolicyUrls) is required.
+	PolicyDir string
+
+	// PolicyFile is a single local .rego file path.
+	PolicyFile string
+
+	// PolicyUrls is a list of URLs (or local file paths) pointing to .rego files,
+	// fetched at startup or read from disk.
+	// Parsed from the comma-separated "policyUrls" config key.
+	PolicyUrls []string
+
+	// Query is the Rego query that returns a set of violation strings.
+	// Default: "data.policy.violations"
+	Query string
+
+	// Actions is the list of beckn actions to enforce policies on.
+	// Default: ["confirm"]
+	Actions []string
+
+	// Enabled controls whether the plugin is active.
+	Enabled bool
+
+	// DebugLogging enables verbose logging.
+	DebugLogging bool
+
+	// RuntimeConfig holds arbitrary key-value pairs passed to Rego as data.config.
+	// Keys like minDeliveryLeadHours are forwarded here.
+	RuntimeConfig map[string]string
+}
+
+// Known config keys that are handled directly (not forwarded to RuntimeConfig).
+var knownKeys = map[string]bool{
+	"policyDir":    true,
+	"policyFile":   true,
+	"policyUrls":   true,
+	"query":        true,
+	"actions":      true,
+	"enabled":      true,
+	"debugLogging": true,
+}
+
+// DefaultConfig returns a Config with sensible defaults.
+func DefaultConfig() *Config {
+	return &Config{
+		Query:         "data.policy.violations",
+		Actions:       []string{"confirm"},
+		Enabled:       true,
+		DebugLogging:  false,
+		RuntimeConfig: make(map[string]string),
+	}
+}
+
+// ParseConfig parses the plugin configuration map into a Config struct.
+func ParseConfig(cfg map[string]string) (*Config, error) {
+	config := DefaultConfig()
+
+	if dir, ok := cfg["policyDir"]; ok && dir != "" {
+		config.PolicyDir = dir
+	}
+	if file, ok := cfg["policyFile"]; ok && file != "" {
+		config.PolicyFile = file
+	}
+
+	// Legacy: comma-separated policyUrls
+	if urls, ok := cfg["policyUrls"]; ok && urls != "" {
+		for _, u := range strings.Split(urls, ",") {
+			u = strings.TrimSpace(u)
+			if u != "" {
+				config.PolicyUrls = append(config.PolicyUrls, u)
+			}
+		}
+	}
+
+	if config.PolicyDir == "" && config.PolicyFile == "" && len(config.PolicyUrls) == 0 {
+		return nil, fmt.Errorf("at least one policy source is required (policyDir, policyFile, or policyUrls)")
+	}
+
+	if query, ok := cfg["query"]; ok && query != "" {
+		config.Query = query
+	}
+
+	if actions, ok := cfg["actions"]; ok && actions != "" {
+		actionList := strings.Split(actions, ",")
+		config.Actions = make([]string, 0, len(actionList))
+		for _, action := range actionList {
+			action = strings.TrimSpace(action)
+			if action != "" {
+				config.Actions = append(config.Actions, action)
+			}
+		}
+	}
+
+	if enabled, ok := cfg["enabled"]; ok {
+		config.Enabled = enabled == "true" || enabled == "1"
+	}
+
+	if debug, ok := cfg["debugLogging"]; ok {
+		config.DebugLogging = debug == "true" || debug == "1"
+	}
+
+	// Forward unknown keys to RuntimeConfig (e.g., minDeliveryLeadHours)
+	for k, v := range cfg {
+		if !knownKeys[k] {
+			config.RuntimeConfig[k] = v
+		}
+	}
+
+	return config, nil
+}
+
+// IsActionEnabled checks if the given action is in the configured actions list.
+func (c *Config) IsActionEnabled(action string) bool {
+	for _, a := range c.Actions {
+		if a == action {
+			return true
+		}
+	}
+	return false
+}

pkg/plugin/implementation/policyenforcer/enforcer.go

@@ -0,0 +1,106 @@
+package policyenforcer
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"strings"
+
+	"github.com/beckn-one/beckn-onix/pkg/log"
+	"github.com/beckn-one/beckn-onix/pkg/model"
+)
+
+// PolicyEnforcer is a Step plugin that evaluates beckn messages against
+// OPA policies and NACKs non-compliant messages.
+type PolicyEnforcer struct {
+	config    *Config
+	evaluator *Evaluator
+}
+
+// New creates a new PolicyEnforcer instance.
+func New(cfg map[string]string) (*PolicyEnforcer, error) {
+	config, err := ParseConfig(cfg)
+	if err != nil {
+		return nil, fmt.Errorf("policyenforcer: config error: %w", err)
+	}
+
+	evaluator, err := NewEvaluator(config.PolicyDir, config.PolicyFile, config.PolicyUrls, config.Query, config.RuntimeConfig)
+	if err != nil {
+		return nil, fmt.Errorf("policyenforcer: failed to initialize OPA evaluator: %w", err)
+	}
+
+	log.Infof(context.TODO(), "PolicyEnforcer initialized (actions=%v, query=%s, policies=%v, debugLogging=%v)",
+		config.Actions, config.Query, evaluator.ModuleNames(), config.DebugLogging)
+
+	return &PolicyEnforcer{
+		config:    config,
+		evaluator: evaluator,
+	}, nil
+}
+
+// Run implements the Step interface. It evaluates the message body against
+// loaded OPA policies. Returns a BadReqErr (causing NACK) if violations are found.
+// Returns an error on evaluation failure (fail closed).
+func (e *PolicyEnforcer) Run(ctx *model.StepContext) error {
+	if !e.config.Enabled {
+		log.Debug(ctx, "PolicyEnforcer: plugin disabled, skipping")
+		return nil
+	}
+
+	// Extract action from the message
+	action := extractAction(ctx.Request.URL.Path, ctx.Body)
+
+	if !e.config.IsActionEnabled(action) {
+		if e.config.DebugLogging {
+			log.Debugf(ctx, "PolicyEnforcer: action %q not in configured actions %v, skipping", action, e.config.Actions)
+		}
+		return nil
+	}
+
+	if e.config.DebugLogging {
+		log.Debugf(ctx, "PolicyEnforcer: evaluating policies for action %q (modules=%v)", action, e.evaluator.ModuleNames())
+	}
+
+	violations, err := e.evaluator.Evaluate(ctx, ctx.Body)
+	if err != nil {
+		// Fail closed: evaluation error → NACK
+		log.Errorf(ctx, err, "PolicyEnforcer: policy evaluation failed: %v", err)
+		return model.NewBadReqErr(fmt.Errorf("policy evaluation error: %w", err))
+	}
+
+	if len(violations) == 0 {
+		if e.config.DebugLogging {
+			log.Debugf(ctx, "PolicyEnforcer: message compliant for action %q", action)
+		}
+		return nil
+	}
+
+	// Non-compliant: NACK with all violation messages
+	msg := fmt.Sprintf("policy violation(s): %s", strings.Join(violations, "; "))
+	log.Warnf(ctx, "PolicyEnforcer: %s", msg)
+	return model.NewBadReqErr(fmt.Errorf("%s", msg))
+}
+
+// Close is a no-op for the policy enforcer (no resources to release).
+func (e *PolicyEnforcer) Close() {}
+
+// extractAction gets the beckn action from the URL path or message body.
+func extractAction(urlPath string, body []byte) string {
+	// Try URL path first: /bap/receiver/{action} or /bpp/caller/{action}
+	parts := strings.Split(strings.Trim(urlPath, "/"), "/")
+	if len(parts) >= 3 {
+		return parts[len(parts)-1]
+	}
+
+	// Fallback: extract from body context.action
+	var payload struct {
+		Context struct {
+			Action string `json:"action"`
+		} `json:"context"`
+	}
+	if err := json.Unmarshal(body, &payload); err == nil && payload.Context.Action != "" {
+		return payload.Context.Action
+	}
+
+	return ""
+}

pkg/plugin/implementation/policyenforcer/enforcer_test.go

@@ -0,0 +1,518 @@
+package policyenforcer
+
+import (
+	"context"
+	"net/http"
+	"net/http/httptest"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/beckn-one/beckn-onix/pkg/model"
+)
+
+// Helper: create a StepContext with the given action path and JSON body.
+func makeStepCtx(action string, body string) *model.StepContext {
+	req, _ := http.NewRequest("POST", "/bpp/caller/"+action, nil)
+	return &model.StepContext{
+		Context: context.Background(),
+		Request: req,
+		Body:    []byte(body),
+	}
+}
+
+// Helper: write a .rego file to a temp dir and return the dir path.
+func writePolicyDir(t *testing.T, filename, content string) string {
+	t.Helper()
+	dir := t.TempDir()
+	err := os.WriteFile(filepath.Join(dir, filename), []byte(content), 0644)
+	if err != nil {
+		t.Fatalf("failed to write policy file: %v", err)
+	}
+	return dir
+}
+
+// --- Config Tests ---
+
+func TestParseConfig_RequiresPolicySource(t *testing.T) {
+	_, err := ParseConfig(map[string]string{})
+	if err == nil {
+		t.Fatal("expected error when no policyDir, policyFile, or policyUrls given")
+	}
+}
+
+func TestParseConfig_Defaults(t *testing.T) {
+	cfg, err := ParseConfig(map[string]string{"policyDir": "/tmp"})
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if cfg.Query != "data.policy.violations" {
+		t.Errorf("expected default query, got %q", cfg.Query)
+	}
+	if len(cfg.Actions) != 1 || cfg.Actions[0] != "confirm" {
+		t.Errorf("expected default actions [confirm], got %v", cfg.Actions)
+	}
+	if !cfg.Enabled {
+		t.Error("expected enabled=true by default")
+	}
+}
+
+func TestParseConfig_RuntimeConfigForwarding(t *testing.T) {
+	cfg, err := ParseConfig(map[string]string{
+		"policyDir":            "/tmp",
+		"minDeliveryLeadHours": "6",
+		"customParam":          "value",
+	})
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if cfg.RuntimeConfig["minDeliveryLeadHours"] != "6" {
+		t.Errorf("expected minDeliveryLeadHours=6, got %q", cfg.RuntimeConfig["minDeliveryLeadHours"])
+	}
+	if cfg.RuntimeConfig["customParam"] != "value" {
+		t.Errorf("expected customParam=value, got %q", cfg.RuntimeConfig["customParam"])
+	}
+}
+
+func TestParseConfig_CustomActions(t *testing.T) {
+	cfg, err := ParseConfig(map[string]string{
+		"policyDir": "/tmp",
+		"actions":   "confirm, select, init",
+	})
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if len(cfg.Actions) != 3 {
+		t.Fatalf("expected 3 actions, got %d: %v", len(cfg.Actions), cfg.Actions)
+	}
+	expected := []string{"confirm", "select", "init"}
+	for i, want := range expected {
+		if cfg.Actions[i] != want {
+			t.Errorf("action[%d] = %q, want %q", i, cfg.Actions[i], want)
+		}
+	}
+}
+
+func TestParseConfig_PolicyUrls(t *testing.T) {
+	cfg, err := ParseConfig(map[string]string{
+		"policyUrls": "https://example.com/a.rego, https://example.com/b.rego",
+	})
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if len(cfg.PolicyUrls) != 2 {
+		t.Fatalf("expected 2 URLs, got %d: %v", len(cfg.PolicyUrls), cfg.PolicyUrls)
+	}
+	if cfg.PolicyUrls[0] != "https://example.com/a.rego" {
+		t.Errorf("url[0] = %q", cfg.PolicyUrls[0])
+	}
+}
+
+// Note: policySources support was removed; we intentionally only support
+// comma-separated policyUrls and local paths via policyUrls entries.
+
+// --- Evaluator Tests (with inline policies) ---
+
+func TestEvaluator_NoViolations(t *testing.T) {
+	policy := `
+package policy
+import rego.v1
+violations contains msg if {
+    input.value < 0
+    msg := "value is negative"
+}
+`
+	dir := writePolicyDir(t, "test.rego", policy)
+	eval, err := NewEvaluator(dir, "", nil, "data.policy.violations", nil)
+	if err != nil {
+		t.Fatalf("NewEvaluator failed: %v", err)
+	}
+
+	violations, err := eval.Evaluate(context.Background(), []byte(`{"value": 10}`))
+	if err != nil {
+		t.Fatalf("Evaluate failed: %v", err)
+	}
+	if len(violations) != 0 {
+		t.Errorf("expected 0 violations, got %d: %v", len(violations), violations)
+	}
+}
+
+func TestEvaluator_WithViolation(t *testing.T) {
+	policy := `
+package policy
+import rego.v1
+violations contains msg if {
+    input.value < 0
+    msg := "value is negative"
+}
+`
+	dir := writePolicyDir(t, "test.rego", policy)
+	eval, err := NewEvaluator(dir, "", nil, "data.policy.violations", nil)
+	if err != nil {
+		t.Fatalf("NewEvaluator failed: %v", err)
+	}
+
+	violations, err := eval.Evaluate(context.Background(), []byte(`{"value": -5}`))
+	if err != nil {
+		t.Fatalf("Evaluate failed: %v", err)
+	}
+	if len(violations) != 1 {
+		t.Fatalf("expected 1 violation, got %d: %v", len(violations), violations)
+	}
+	if violations[0] != "value is negative" {
+		t.Errorf("unexpected violation: %q", violations[0])
+	}
+}
+
+func TestEvaluator_RuntimeConfig(t *testing.T) {
+	policy := `
+package policy
+import rego.v1
+violations contains msg if {
+    input.value > to_number(data.config.maxValue)
+    msg := "value exceeds maximum"
+}
+`
+	dir := writePolicyDir(t, "test.rego", policy)
+	eval, err := NewEvaluator(dir, "", nil, "data.policy.violations", map[string]string{"maxValue": "100"})
+	if err != nil {
+		t.Fatalf("NewEvaluator failed: %v", err)
+	}
+
+	// Under limit
+	violations, err := eval.Evaluate(context.Background(), []byte(`{"value": 50}`))
+	if err != nil {
+		t.Fatalf("Evaluate failed: %v", err)
+	}
+	if len(violations) != 0 {
+		t.Errorf("expected 0 violations for value=50, got %v", violations)
+	}
+
+	// Over limit
+	violations, err = eval.Evaluate(context.Background(), []byte(`{"value": 150}`))
+	if err != nil {
+		t.Fatalf("Evaluate failed: %v", err)
+	}
+	if len(violations) != 1 {
+		t.Errorf("expected 1 violation for value=150, got %v", violations)
+	}
+}
+
+func TestEvaluator_SkipsTestFiles(t *testing.T) {
+	dir := t.TempDir()
+
+	policy := `
+package policy
+import rego.v1
+violations contains "always" if { true }
+`
+	os.WriteFile(filepath.Join(dir, "policy.rego"), []byte(policy), 0644)
+
+	// Test file would cause compilation issues if loaded (different package)
+	testFile := `
+package policy_test
+import rego.v1
+import data.policy
+test_something if { count(policy.violations) > 0 }
+`
+	os.WriteFile(filepath.Join(dir, "policy_test.rego"), []byte(testFile), 0644)
+
+	eval, err := NewEvaluator(dir, "", nil, "data.policy.violations", nil)
+	if err != nil {
+		t.Fatalf("NewEvaluator should skip _test.rego files, but failed: %v", err)
+	}
+
+	violations, err := eval.Evaluate(context.Background(), []byte(`{}`))
+	if err != nil {
+		t.Fatalf("Evaluate failed: %v", err)
+	}
+	if len(violations) != 1 {
+		t.Errorf("expected 1 violation, got %d", len(violations))
+	}
+}
+
+func TestEvaluator_InvalidJSON(t *testing.T) {
+	policy := `
+package policy
+import rego.v1
+violations := set()
+`
+	dir := writePolicyDir(t, "test.rego", policy)
+	eval, err := NewEvaluator(dir, "", nil, "data.policy.violations", nil)
+	if err != nil {
+		t.Fatalf("NewEvaluator failed: %v", err)
+	}
+
+	_, err = eval.Evaluate(context.Background(), []byte(`not json`))
+	if err == nil {
+		t.Error("expected error for invalid JSON")
+	}
+}
+
+// --- Evaluator URL Fetch Tests ---
+
+func TestEvaluator_FetchFromURL(t *testing.T) {
+	policy := `
+package policy
+import rego.v1
+violations contains msg if {
+    input.value < 0
+    msg := "value is negative"
+}
+`
+	// Serve the policy via a local HTTP server
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "text/plain")
+		w.Write([]byte(policy))
+	}))
+	defer srv.Close()
+
+	eval, err := NewEvaluator("", "", []string{srv.URL + "/test_policy.rego"}, "data.policy.violations", nil)
+	if err != nil {
+		t.Fatalf("NewEvaluator with URL failed: %v", err)
+	}
+
+	// Compliant
+	violations, err := eval.Evaluate(context.Background(), []byte(`{"value": 10}`))
+	if err != nil {
+		t.Fatalf("Evaluate failed: %v", err)
+	}
+	if len(violations) != 0 {
+		t.Errorf("expected 0 violations, got %v", violations)
+	}
+
+	// Non-compliant
+	violations, err = eval.Evaluate(context.Background(), []byte(`{"value": -1}`))
+	if err != nil {
+		t.Fatalf("Evaluate failed: %v", err)
+	}
+	if len(violations) != 1 {
+		t.Errorf("expected 1 violation, got %v", violations)
+	}
+}
+
+func TestEvaluator_FetchURL_NotFound(t *testing.T) {
+	srv := httptest.NewServer(http.NotFoundHandler())
+	defer srv.Close()
+
+	_, err := NewEvaluator("", "", []string{srv.URL + "/missing.rego"}, "data.policy.violations", nil)
+	if err == nil {
+		t.Fatal("expected error for 404 URL")
+	}
+}
+
+func TestEvaluator_FetchURL_InvalidScheme(t *testing.T) {
+	_, err := NewEvaluator("", "", []string{"ftp://example.com/policy.rego"}, "data.policy.violations", nil)
+	if err == nil {
+		t.Fatal("expected error for ftp:// scheme")
+	}
+}
+
+func TestEvaluator_MixedLocalAndURL(t *testing.T) {
+	// Local policy
+	localPolicy := `
+package policy
+import rego.v1
+violations contains "local_violation" if { input.local_bad }
+`
+	dir := writePolicyDir(t, "local.rego", localPolicy)
+
+	// Remote policy (different rule, same package)
+	remotePolicy := `
+package policy
+import rego.v1
+violations contains "remote_violation" if { input.remote_bad }
+`
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Write([]byte(remotePolicy))
+	}))
+	defer srv.Close()
+
+	eval, err := NewEvaluator(dir, "", []string{srv.URL + "/remote.rego"}, "data.policy.violations", nil)
+	if err != nil {
+		t.Fatalf("NewEvaluator failed: %v", err)
+	}
+
+	// Trigger both violations
+	violations, err := eval.Evaluate(context.Background(), []byte(`{"local_bad": true, "remote_bad": true}`))
+	if err != nil {
+		t.Fatalf("Evaluate failed: %v", err)
+	}
+	if len(violations) != 2 {
+		t.Errorf("expected 2 violations (local+remote), got %d: %v", len(violations), violations)
+	}
+}
+
+// --- Evaluator with local file path in policySources ---
+
+func TestEvaluator_LocalFilePath(t *testing.T) {
+	policy := `
+package policy
+import rego.v1
+violations contains "from_file" if { input.bad }
+`
+	dir := t.TempDir()
+	policyPath := filepath.Join(dir, "local_policy.rego")
+	os.WriteFile(policyPath, []byte(policy), 0644)
+
+	eval, err := NewEvaluator("", "", []string{policyPath}, "data.policy.violations", nil)
+	if err != nil {
+		t.Fatalf("NewEvaluator with local path failed: %v", err)
+	}
+
+	violations, err := eval.Evaluate(context.Background(), []byte(`{"bad": true}`))
+	if err != nil {
+		t.Fatalf("Evaluate failed: %v", err)
+	}
+	if len(violations) != 1 || violations[0] != "from_file" {
+		t.Errorf("expected [from_file], got %v", violations)
+	}
+}
+
+// --- Enforcer Integration Tests ---
+
+func TestEnforcer_Compliant(t *testing.T) {
+	policy := `
+package policy
+import rego.v1
+violations contains "blocked" if { input.context.action == "confirm"; input.block }
+`
+	dir := writePolicyDir(t, "test.rego", policy)
+
+	enforcer, err := New(map[string]string{
+		"policyDir": dir,
+		"actions":   "confirm",
+	})
+	if err != nil {
+		t.Fatalf("New failed: %v", err)
+	}
+
+	ctx := makeStepCtx("confirm", `{"context": {"action": "confirm"}, "block": false}`)
+	err = enforcer.Run(ctx)
+	if err != nil {
+		t.Errorf("expected nil error for compliant message, got: %v", err)
+	}
+}
+
+func TestEnforcer_NonCompliant(t *testing.T) {
+	policy := `
+package policy
+import rego.v1
+violations contains "blocked" if { input.context.action == "confirm" }
+`
+	dir := writePolicyDir(t, "test.rego", policy)
+
+	enforcer, err := New(map[string]string{
+		"policyDir": dir,
+		"actions":   "confirm",
+	})
+	if err != nil {
+		t.Fatalf("New failed: %v", err)
+	}
+
+	ctx := makeStepCtx("confirm", `{"context": {"action": "confirm"}}`)
+	err = enforcer.Run(ctx)
+	if err == nil {
+		t.Fatal("expected error for non-compliant message, got nil")
+	}
+
+	// Should be a BadReqErr
+	if _, ok := err.(*model.BadReqErr); !ok {
+		t.Errorf("expected *model.BadReqErr, got %T: %v", err, err)
+	}
+}
+
+func TestEnforcer_SkipsNonMatchingAction(t *testing.T) {
+	policy := `
+package policy
+import rego.v1
+violations contains "blocked" if { true }
+`
+	dir := writePolicyDir(t, "test.rego", policy)
+
+	enforcer, err := New(map[string]string{
+		"policyDir": dir,
+		"actions":   "confirm",
+	})
+	if err != nil {
+		t.Fatalf("New failed: %v", err)
+	}
+
+	// Non-compliant body, but action is "search" — not in configured actions
+	ctx := makeStepCtx("search", `{"context": {"action": "search"}}`)
+	err = enforcer.Run(ctx)
+	if err != nil {
+		t.Errorf("expected nil for non-matching action, got: %v", err)
+	}
+}
+
+func TestEnforcer_DisabledPlugin(t *testing.T) {
+	policy := `
+package policy
+import rego.v1
+violations contains "blocked" if { true }
+`
+	dir := writePolicyDir(t, "test.rego", policy)
+
+	enforcer, err := New(map[string]string{
+		"policyDir": dir,
+		"enabled":   "false",
+	})
+	if err != nil {
+		t.Fatalf("New failed: %v", err)
+	}
+
+	ctx := makeStepCtx("confirm", `{"context": {"action": "confirm"}}`)
+	err = enforcer.Run(ctx)
+	if err != nil {
+		t.Errorf("expected nil for disabled plugin, got: %v", err)
+	}
+}
+
+// --- Enforcer with URL-sourced policy ---
+
+func TestEnforcer_PolicyFromURL(t *testing.T) {
+	policy := `
+package policy
+import rego.v1
+violations contains "blocked" if { input.context.action == "confirm" }
+`
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Write([]byte(policy))
+	}))
+	defer srv.Close()
+
+	enforcer, err := New(map[string]string{
+		"policyUrls": srv.URL + "/block_confirm.rego",
+		"actions":    "confirm",
+	})
+	if err != nil {
+		t.Fatalf("New failed: %v", err)
+	}
+
+	ctx := makeStepCtx("confirm", `{"context": {"action": "confirm"}}`)
+	err = enforcer.Run(ctx)
+	if err == nil {
+		t.Fatal("expected error from URL-sourced policy, got nil")
+	}
+	if _, ok := err.(*model.BadReqErr); !ok {
+		t.Errorf("expected *model.BadReqErr, got %T", err)
+	}
+}
+
+// --- extractAction Tests ---
+
+func TestExtractAction_FromURL(t *testing.T) {
+	action := extractAction("/bpp/caller/confirm", nil)
+	if action != "confirm" {
+		t.Errorf("expected 'confirm', got %q", action)
+	}
+}
+
+func TestExtractAction_FromBody(t *testing.T) {
+	body := []byte(`{"context": {"action": "select"}}`)
+	action := extractAction("/x", body)
+	if action != "select" {
+		t.Errorf("expected 'select', got %q", action)
+	}
+}

pkg/plugin/implementation/policyenforcer/evaluator.go

@@ -0,0 +1,238 @@
+package policyenforcer
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"os"
+	"path"
+	"path/filepath"
+	"strings"
+	"time"
+
+	"github.com/open-policy-agent/opa/v1/ast"
+	"github.com/open-policy-agent/opa/v1/rego"
+	"github.com/open-policy-agent/opa/v1/storage/inmem"
+)
+
+// Evaluator wraps the OPA engine: loads and compiles .rego files at startup,
+// then evaluates messages against the compiled policy set.
+type Evaluator struct {
+	preparedQuery rego.PreparedEvalQuery
+	query         string
+	runtimeConfig map[string]string
+	moduleNames   []string // names of loaded .rego modules
+}
+
+// ModuleNames returns the names of the loaded .rego policy modules.
+func (e *Evaluator) ModuleNames() []string {
+	return e.moduleNames
+}
+
+// policyFetchTimeout is the HTTP timeout for fetching remote .rego files.
+const policyFetchTimeout = 30 * time.Second
+
+// maxPolicySize is the maximum size of a single .rego file fetched from a URL (1 MB).
+const maxPolicySize = 1 << 20
+
+// NewEvaluator creates an Evaluator by loading .rego files from local paths
+// and/or URLs, then compiling them. runtimeConfig is passed to Rego as data.config.
+func NewEvaluator(policyDir, policyFile string, policyUrls []string, query string, runtimeConfig map[string]string) (*Evaluator, error) {
+	modules := make(map[string]string)
+
+	// Load from local directory
+	if policyDir != "" {
+		entries, err := os.ReadDir(policyDir)
+		if err != nil {
+			return nil, fmt.Errorf("failed to read policy directory %s: %w", policyDir, err)
+		}
+		for _, entry := range entries {
+			if entry.IsDir() {
+				continue
+			}
+			if !strings.HasSuffix(entry.Name(), ".rego") {
+				continue
+			}
+			// Skip test files — they shouldn't be compiled into the runtime evaluator
+			if strings.HasSuffix(entry.Name(), "_test.rego") {
+				continue
+			}
+			fpath := filepath.Join(policyDir, entry.Name())
+			data, err := os.ReadFile(fpath)
+			if err != nil {
+				return nil, fmt.Errorf("failed to read policy file %s: %w", fpath, err)
+			}
+			modules[entry.Name()] = string(data)
+		}
+	}
+
+	// Load single local file
+	if policyFile != "" {
+		data, err := os.ReadFile(policyFile)
+		if err != nil {
+			return nil, fmt.Errorf("failed to read policy file %s: %w", policyFile, err)
+		}
+		modules[filepath.Base(policyFile)] = string(data)
+	}
+
+	// Load from URLs and local file paths (policyUrls)
+	for _, rawSource := range policyUrls {
+		if isURL(rawSource) {
+			name, content, err := fetchPolicy(rawSource)
+			if err != nil {
+				return nil, fmt.Errorf("failed to fetch policy from %s: %w", rawSource, err)
+			}
+			modules[name] = content
+		} else {
+			// Treat as local file path
+			data, err := os.ReadFile(rawSource)
+			if err != nil {
+				return nil, fmt.Errorf("failed to read local policy source %s: %w", rawSource, err)
+			}
+			modules[filepath.Base(rawSource)] = string(data)
+		}
+	}
+
+	if len(modules) == 0 {
+		return nil, fmt.Errorf("no .rego policy files found from any configured source")
+	}
+
+	// Compile modules to catch syntax errors early
+	compiler, err := ast.CompileModulesWithOpt(modules, ast.CompileOpts{ParserOptions: ast.ParserOptions{RegoVersion: ast.RegoV1}})
+	if err != nil {
+		return nil, fmt.Errorf("failed to compile rego modules: %w", err)
+	}
+
+	// Build data.config from runtime config
+	store := map[string]interface{}{
+		"config": toInterfaceMap(runtimeConfig),
+	}
+
+	pq, err := rego.New(
+		rego.Query(query),
+		rego.Compiler(compiler),
+		rego.Store(inmem.NewFromObject(store)),
+	).PrepareForEval(context.Background())
+	if err != nil {
+		return nil, fmt.Errorf("failed to prepare rego query %q: %w", query, err)
+	}
+
+	names := make([]string, 0, len(modules))
+	for name := range modules {
+		names = append(names, name)
+	}
+
+	return &Evaluator{
+		preparedQuery: pq,
+		query:         query,
+		runtimeConfig: runtimeConfig,
+		moduleNames:   names,
+	}, nil
+}
+
+// isURL checks if a source string looks like a remote URL.
+func isURL(source string) bool {
+	return strings.HasPrefix(source, "http://") || strings.HasPrefix(source, "https://")
+}
+
+// fetchPolicy downloads a .rego file from a URL and returns (filename, content, error).
+func fetchPolicy(rawURL string) (string, string, error) {
+	parsed, err := url.Parse(rawURL)
+	if err != nil {
+		return "", "", fmt.Errorf("invalid URL: %w", err)
+	}
+
+	if parsed.Scheme != "http" && parsed.Scheme != "https" {
+		return "", "", fmt.Errorf("unsupported URL scheme %q (only http and https are supported)", parsed.Scheme)
+	}
+
+	client := &http.Client{Timeout: policyFetchTimeout}
+	resp, err := client.Get(rawURL)
+	if err != nil {
+		return "", "", fmt.Errorf("HTTP request failed: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		return "", "", fmt.Errorf("HTTP %d from %s", resp.StatusCode, rawURL)
+	}
+
+	// Read with size limit
+	limited := io.LimitReader(resp.Body, maxPolicySize+1)
+	body, err := io.ReadAll(limited)
+	if err != nil {
+		return "", "", fmt.Errorf("failed to read response body: %w", err)
+	}
+	if len(body) > maxPolicySize {
+		return "", "", fmt.Errorf("policy file exceeds maximum size of %d bytes", maxPolicySize)
+	}
+
+	// Derive filename from URL path
+	name := path.Base(parsed.Path)
+	if name == "" || name == "." || name == "/" {
+		name = "policy.rego"
+	}
+	if !strings.HasSuffix(name, ".rego") {
+		name += ".rego"
+	}
+
+	return name, string(body), nil
+}
+
+// Evaluate runs the compiled policy against a JSON message body.
+// Returns a list of violation strings (empty = compliant).
+func (e *Evaluator) Evaluate(ctx context.Context, body []byte) ([]string, error) {
+	var input interface{}
+	if err := json.Unmarshal(body, &input); err != nil {
+		return nil, fmt.Errorf("failed to parse message body as JSON: %w", err)
+	}
+
+	rs, err := e.preparedQuery.Eval(ctx, rego.EvalInput(input))
+	if err != nil {
+		return nil, fmt.Errorf("rego evaluation failed: %w", err)
+	}
+
+	return extractViolations(rs)
+}
+
+// extractViolations pulls string violations from the OPA result set.
+// The query is expected to return a set of strings.
+func extractViolations(rs rego.ResultSet) ([]string, error) {
+	if len(rs) == 0 {
+		return nil, nil
+	}
+
+	var violations []string
+	for _, result := range rs {
+		for _, expr := range result.Expressions {
+			switch v := expr.Value.(type) {
+			case []interface{}:
+				// Result is a list (from set)
+				for _, item := range v {
+					if s, ok := item.(string); ok {
+						violations = append(violations, s)
+					}
+				}
+			case map[string]interface{}:
+				// OPA sometimes returns sets as maps with string keys
+				for key := range v {
+					violations = append(violations, key)
+				}
+			}
+		}
+	}
+
+	return violations, nil
+}
+
+// toInterfaceMap converts map[string]string to map[string]interface{} for OPA store.
+func toInterfaceMap(m map[string]string) map[string]interface{} {
+	result := make(map[string]interface{}, len(m))
+	for k, v := range m {
+		result[k] = v
+	}
+	return result
+}

pkg/plugin/manager.go

@@ -257,6 +257,23 @@ func (m *Manager) Step(ctx context.Context, cfg *Config) (definition.Step, error
 	return step, error
 }
 
+// PolicyEnforcer returns a PolicyEnforcer instance based on the provided configuration.
+// It registers a cleanup function for resource management.
+func (m *Manager) PolicyEnforcer(ctx context.Context, cfg *Config) (definition.PolicyEnforcer, error) {
+	pp, err := provider[definition.PolicyEnforcerProvider](m.plugins, cfg.ID)
+	if err != nil {
+		return nil, fmt.Errorf("failed to load provider for %s: %w", cfg.ID, err)
+	}
+	enforcer, closer, err := pp.New(ctx, cfg.Config)
+	if err != nil {
+		return nil, err
+	}
+	if closer != nil {
+		m.closers = append(m.closers, closer)
+	}
+	return enforcer, nil
+}
+
 // Cache returns a Cache instance based on the provided configuration.
 // It registers a cleanup function for resource management.
 func (m *Manager) Cache(ctx context.Context, cfg *Config) (definition.Cache, error) {

policies/compliance.rego

@@ -0,0 +1,18 @@
+package policy
+
+import rego.v1
+
+# Example policy: validate confirm action messages.
+# This is a sample policy file. Replace with your actual business rules.
+#
+# The policy evaluates incoming beckn messages and produces a set of
+# violation strings. If any violations exist, the adapter will NACK
+# the request.
+#
+# Available inputs:
+#   - input: the full JSON message body
+#   - data.config: runtime config from the adapter config (e.g., minDeliveryLeadHours)
+
+# violations is the set of policy violation messages.
+# An empty set means the message is compliant.
+violations := set()