add event type & logging interceptor for unknown hosts (#157)

* add event type & logging interceptor for unknown hosts

* update logging

* add break

* rename host_observation interceptor to audit_logger

* restore MITMDecider and make AuditLogger telemetry skip MITM on CONNECT

proxy/interceptors/audit_logger_test.go

@@ -0,0 +1,44 @@
+package interceptors
+
+import (
+	"net/http"
+	"testing"
+
+	"github.com/safedep/pmg/proxy"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestAuditLoggerInterceptor_Behavior(t *testing.T) {
+	i := NewAuditLoggerInterceptor()
+
+	assert.Equal(t, "audit-logger-interceptor", i.Name())
+	assert.True(t, i.ShouldIntercept(nil))
+	assert.False(t, i.ShouldMITM(nil))
+}
+
+func TestAuditLoggerInterceptor_KnownRegistryHost(t *testing.T) {
+	i := NewAuditLoggerInterceptor()
+
+	resp, err := i.HandleRequest(&proxy.RequestContext{
+		Hostname: "registry.npmjs.org",
+		Method:   http.MethodConnect,
+	})
+
+	assert.NoError(t, err)
+	assert.NotNil(t, resp)
+	assert.Equal(t, proxy.ActionAllow, resp.Action)
+}
+
+func TestAuditLoggerInterceptor_UnknownHost(t *testing.T) {
+	i := NewAuditLoggerInterceptor()
+
+	resp, err := i.HandleRequest(&proxy.RequestContext{
+		Hostname:  "unknown.example.test",
+		Method:    http.MethodConnect,
+		RequestID: "req-unknown",
+	})
+
+	assert.NoError(t, err)
+	assert.NotNil(t, resp)
+	assert.Equal(t, proxy.ActionAllow, resp.Action)
+}