config: add a consistent route ID (#905)

config/policy_test.go

@@ -5,6 +5,7 @@ import (
 	"testing"
 
 	"github.com/google/go-cmp/cmp"
+	"github.com/stretchr/testify/assert"
 )
 
 func Test_PolicyValidate(t *testing.T) {
@@ -81,3 +82,48 @@ func TestPolicy_String(t *testing.T) {
 		})
 	}
 }
+
+func Test_PolicyRouteID(t *testing.T) {
+	t.Parallel()
+	tests := []struct {
+		name          string
+		basePolicy    *Policy
+		comparePolicy *Policy
+		wantID        uint64
+		wantSame      bool
+	}{
+		{
+			"same",
+			&Policy{From: "https://pomerium.io", To: "http://localhost", AllowedUsers: []string{"foo@bar.com"}},
+			&Policy{From: "https://pomerium.io", To: "http://localhost", AllowedGroups: []string{"allusers"}},
+			6315033228798964203,
+			true,
+		},
+		{
+			"different from",
+			&Policy{From: "https://pomerium.io", To: "http://localhost"},
+			&Policy{From: "https://notpomerium.io", To: "http://localhost"},
+			6315033228798964203,
+			false,
+		},
+		{
+			"different path",
+			&Policy{From: "https://pomerium.io", To: "http://localhost"},
+			&Policy{From: "https://pomerium.io", To: "http://localhost", Path: "/foo"},
+			6315033228798964203,
+			false,
+		},
+	}
+
+	for _, tt := range tests {
+		tt := tt
+		t.Run(tt.name, func(t *testing.T) {
+			t.Parallel()
+			assert.NoError(t, tt.basePolicy.Validate())
+			assert.NoError(t, tt.comparePolicy.Validate())
+
+			assert.Equal(t, tt.wantSame, tt.basePolicy.RouteID() == tt.comparePolicy.RouteID())
+			assert.Equal(t, tt.wantID, tt.basePolicy.RouteID())
+		})
+	}
+}