Add support for new policy conditions (#7024)

This PR implements following condition types

- StringEqualsIgnoreCase and StringNotEqualsIgnoreCase
- BinaryEquals

pkg/policy/condition/stringlikefunc.go

@@ -20,8 +20,8 @@ import (
 	"fmt"
 	"net/http"
 	"sort"
-	"strings"
 
+	"github.com/minio/minio-go/pkg/s3utils"
 	"github.com/minio/minio-go/pkg/set"
 	"github.com/minio/minio/pkg/wildcard"
 )
@@ -118,12 +118,13 @@ func validateStringLikeValues(n name, key Key, values set.StringSet) error {
 	for _, s := range values.ToSlice() {
 		switch key {
 		case S3XAmzCopySource:
-			tokens := strings.SplitN(s, "/", 2)
-			if len(tokens) < 2 {
-				return fmt.Errorf("invalid value '%v' for '%v' in %v condition", s, key, n)
+			bucket, object := path2BucketAndObject(s)
+			if object == "" {
+				return fmt.Errorf("invalid value '%v' for '%v' for %v condition", s, S3XAmzCopySource, n)
+			}
+			if err := s3utils.CheckValidBucketName(bucket); err != nil {
+				return err
 			}
-
-			// FIXME: tokens[0] must be a valid bucket name.
 		}
 	}