cli/command: remove uses of GetAuthConfigKey, ParseRepositoryInfo

Re-implement locally, based on the code in github.com/docker/docker/registry,
but leaving out bits that are not used on the client-side, such as
configuration of Mirrors, and configurable insecure-registry, which
are not used on the client side.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

Author: thaJeztah

cli/command/registry.go

@@ -15,7 +15,6 @@ import (
 	"github.com/docker/cli/cli/streams"
 	"github.com/docker/cli/internal/tui"
 	registrytypes "github.com/docker/docker/api/types/registry"
-	"github.com/docker/docker/registry"
 	"github.com/morikuni/aec"
 	"github.com/pkg/errors"
 )
@@ -28,16 +27,22 @@ const (
 		"for organizations using SSO. Learn more at https://docs.docker.com/go/access-tokens/"
 )
 
+// authConfigKey is the key used to store credentials for Docker Hub. It is
+// a copy of [registry.IndexServer].
+//
+// [registry.IndexServer]: https://pkg.go.dev/github.com/docker/docker/registry#IndexServer
+const authConfigKey = "https:/index.docker.io/v1/"
+
 // RegistryAuthenticationPrivilegedFunc returns a RequestPrivilegeFunc from the specified registry index info
 // for the given command.
 func RegistryAuthenticationPrivilegedFunc(cli Cli, index *registrytypes.IndexInfo, cmdName string) registrytypes.RequestAuthConfig {
+	indexServer := getAuthConfigKey(index.Name)
+	isDefaultRegistry := indexServer == authConfigKey || index.Official
 	return func(ctx context.Context) (string, error) {
 		_, _ = fmt.Fprintf(cli.Out(), "\nLogin prior to %s:\n", cmdName)
-		indexServer := registry.GetAuthConfigKey(index)
-		isDefaultRegistry := indexServer == registry.IndexServer
 		authConfig, err := GetDefaultAuthConfig(cli.ConfigFile(), true, indexServer, isDefaultRegistry)
 		if err != nil {
-			_, _ = fmt.Fprintf(cli.Err(), "Unable to retrieve stored credentials for %s, error: %s.\n", indexServer, err)
+			_, _ = fmt.Fprintf(cli.Err(), "Unable to retrieve stored credentials for %s, error: %s.\n", authConfigKey, err)
 		}
 
 		select {
@@ -46,7 +51,7 @@ func RegistryAuthenticationPrivilegedFunc(cli Cli, index *registrytypes.IndexInf
 		default:
 		}
 
-		authConfig, err = PromptUserForCredentials(ctx, cli, "", "", authConfig.Username, indexServer)
+		authConfig, err = PromptUserForCredentials(ctx, cli, "", "", authConfig.Username, authConfigKey)
 		if err != nil {
 			return "", err
 		}
@@ -63,7 +68,7 @@ func RegistryAuthenticationPrivilegedFunc(cli Cli, index *registrytypes.IndexInf
 func ResolveAuthConfig(cfg *configfile.ConfigFile, index *registrytypes.IndexInfo) registrytypes.AuthConfig {
 	configKey := index.Name
 	if index.Official {
-		configKey = registry.IndexServer
+		configKey = authConfigKey
 	}
 
 	a, _ := cfg.GetAuthConfig(configKey)
@@ -132,7 +137,7 @@ func PromptUserForCredentials(ctx context.Context, cli Cli, argUser, argPassword
 
 	argUser = strings.TrimSpace(argUser)
 	if argUser == "" {
-		if serverAddress == registry.IndexServer {
+		if serverAddress == authConfigKey {
 			// When signing in to the default (Docker Hub) registry, we display
 			// hints for creating an account, and (if hints are enabled), using
 			// a token instead of a password.
@@ -225,9 +230,26 @@ func resolveAuthConfigFromImage(cfg *configfile.ConfigFile, image string) (regis
 	if err != nil {
 		return registrytypes.AuthConfig{}, err
 	}
-	repoInfo, err := registry.ParseRepositoryInfo(registryRef)
+	domainName := reference.Domain(registryRef)
+	configKey := getAuthConfigKey(domainName)
+	a, err := cfg.GetAuthConfig(configKey)
 	if err != nil {
 		return registrytypes.AuthConfig{}, err
 	}
-	return ResolveAuthConfig(cfg, repoInfo.Index), nil
+	return registrytypes.AuthConfig(a), nil
+}
+
+// getAuthConfigKey special-cases using the full index address of the official
+// index as the AuthConfig key, and uses the (host)name[:port] for private indexes.
+//
+// It is similar to [registry.GetAuthConfigKey], but does not require on
+// [registrytypes.IndexInfo] as intermediate.
+//
+// [registry.GetAuthConfigKey]: https://pkg.go.dev/github.com/docker/docker/registry#GetAuthConfigKey
+// [registrytypes.IndexInfo]:https://pkg.go.dev/github.com/docker/docker/api/types/registry#IndexInfo
+func getAuthConfigKey(domainName string) string {
+	if domainName == "docker.io" || domainName == "index.docker.io" {
+		return authConfigKey
+	}
+	return domainName
 }