cli/compose: implement the ports validation method

This commit implements a validation
method for the port mappings.

Also, it removes the ports validation
method from the expose property
since they do not accept the
same type of values.

Signed-off-by: Stavros Panakakis <stavrospanakakis@gmail.com>

cli/compose/schema/schema.go

@@ -6,9 +6,11 @@ package schema
 import (
 	"embed"
 	"fmt"
+	"math/big"
 	"strings"
 	"time"
 
+	"github.com/docker/go-connections/nat"
 	"github.com/pkg/errors"
 	"github.com/xeipuuv/gojsonschema"
 )
@@ -20,9 +22,18 @@ const (
 
 type portsFormatChecker struct{}
 
-func (checker portsFormatChecker) IsFormat(_ any) bool {
-	// TODO: implement this
-	return true
+func (checker portsFormatChecker) IsFormat(input any) bool {
+	var portSpec string
+
+	switch p := input.(type) {
+	case string:
+		portSpec = p
+	case *big.Rat:
+		portSpec = strings.Split(p.String(), "/")[0]
+	}
+
+	_, err := nat.ParsePortSpec(portSpec)
+	return err == nil
 }
 
 type durationFormatChecker struct{}
@@ -37,7 +48,6 @@ func (checker durationFormatChecker) IsFormat(input any) bool {
 }
 
 func init() {
-	gojsonschema.FormatCheckers.Add("expose", portsFormatChecker{})
 	gojsonschema.FormatCheckers.Add("ports", portsFormatChecker{})
 	gojsonschema.FormatCheckers.Add("duration", durationFormatChecker{})
 }

cli/compose/schema/schema_test.go

@@ -29,6 +29,111 @@ func TestValidate(t *testing.T) {
 	assert.ErrorContains(t, Validate(config, "12345"), "unsupported Compose file version: 12345")
 }
 
+func TestValidatePorts(t *testing.T) {
+	testcases := []struct {
+		ports    any
+		hasError bool
+	}{
+		{
+			ports:    []int{8000},
+			hasError: false,
+		},
+		{
+			ports:    []string{"8000:8000"},
+			hasError: false,
+		},
+		{
+			ports:    []string{"8001-8005"},
+			hasError: false,
+		},
+		{
+			ports:    []string{"8001-8005:8001-8005"},
+			hasError: false,
+		},
+		{
+			ports:    []string{"8000"},
+			hasError: false,
+		},
+		{
+			ports:    []string{"8000-9000:80"},
+			hasError: false,
+		},
+		{
+			ports:    []string{"[::1]:8080:8000"},
+			hasError: false,
+		},
+		{
+			ports:    []string{"[::1]:8080-8085:8000"},
+			hasError: false,
+		},
+		{
+			ports:    []string{"127.0.0.1:8000:8000"},
+			hasError: false,
+		},
+		{
+			ports:    []string{"127.0.0.1:8000-8005:8000-8005"},
+			hasError: false,
+		},
+		{
+			ports:    []string{"127.0.0.1:8000:8000/udp"},
+			hasError: false,
+		},
+		{
+			ports:    []string{"8000:8000/udp"},
+			hasError: false,
+		},
+		{
+			ports:    []string{"8000:8000/http"},
+			hasError: true,
+		},
+		{
+			ports:    []string{"-1"},
+			hasError: true,
+		},
+		{
+			ports:    []string{"65536"},
+			hasError: true,
+		},
+		{
+			ports:    []string{"-1:65536/http"},
+			hasError: true,
+		},
+		{
+			ports:    []string{"invalid"},
+			hasError: true,
+		},
+		{
+			ports:    []string{"12345678:8000:8000/tcp"},
+			hasError: true,
+		},
+		{
+			ports:    []string{"8005-8000:8005-8000"},
+			hasError: true,
+		},
+		{
+			ports:    []string{"8006-8000:8005-8000"},
+			hasError: true,
+		},
+	}
+
+	for _, tc := range testcases {
+		config := dict{
+			"version": "3.0",
+			"services": dict{
+				"foo": dict{
+					"image": "busybox",
+					"ports": tc.ports,
+				},
+			},
+		}
+		if tc.hasError {
+			assert.ErrorContains(t, Validate(config, "3"), "services.foo.ports.0 Does not match format 'ports'")
+		} else {
+			assert.NilError(t, Validate(config, "3"))
+		}
+	}
+}
+
 func TestValidateUndefinedTopLevelOption(t *testing.T) {
 	config := dict{
 		"version": "3.0",