WIP: don't require IndexInfo

Lots to do here; too many wrappers everywhere, which may become easier
when content trust is removed (which adds another level of abstraction)

Signed-off-by: Sebastiaan van Stijn <[email protected]>

Author: thaJeztah

cli/command/image/trust.go

@@ -154,6 +154,7 @@ func getTrustedPullTargets(cli command.Cli, imgRefAndAuth trust.ImageRefAndAuth)
 
 // imagePullPrivileged pulls the image and displays it to the output
 func imagePullPrivileged(ctx context.Context, cli command.Cli, imgRefAndAuth trust.ImageRefAndAuth, opts pullOptions) error {
+	// TODO(thaJeztah): get rid of this trust.ImageRefAndAuth monstrosity; we're wrapping wrappers around wrappers; all we need here is the image ref (or even less: the registry name)
 	encodedAuth, err := authconfig.Encode(*imgRefAndAuth.AuthConfig())
 	if err != nil {
 		return err

cli/command/registry.go

@@ -35,6 +35,44 @@ const (
 // [registry.IndexServer]: https://pkg.go.dev/github.com/docker/[email protected]+incompatible/registry#IndexServer
 const authConfigKey = "https://index.docker.io/v1/"
 
+// NewAuthRequester returns a RequestPrivilegeFunc for the specified registry
+// and the given cmdName (used as informational message to the user).
+//
+// The returned function is a [registrytypes.RequestAuthConfig] to prompt the user
+// for credentials if needed. It is called as fallback if the credentials (if any)
+// used for the initial operation did not work.
+//
+// TODO(thaJeztah): cli Cli could be a Streams if it was not for cli.SetIn to be needed?
+// TODO(thaJeztah): ideally, this would accept reposName / imageRef as a regular string (we can parse it if needed!), or .. maybe generics and accept either?
+func NewAuthRequester(cli Cli, indexServer string, promptMsg string) registrytypes.RequestAuthConfig {
+	configKey := getAuthConfigKey(indexServer)
+	return newPrivilegeFunc(cli, configKey, promptMsg)
+}
+
+func newPrivilegeFunc(cli Cli, indexServer string, promptMsg string) registrytypes.RequestAuthConfig {
+	return func(ctx context.Context) (string, error) {
+		// TODO(thaJeztah): can we make the prompt an argument? ("prompt func()" or "prompt func()?
+		_, _ = fmt.Fprint(cli.Out(), "\n"+promptMsg+"\n")
+		isDefaultRegistry := indexServer == authConfigKey
+		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)
+		}
+
+		select {
+		case <-ctx.Done():
+			return "", ctx.Err()
+		default:
+		}
+
+		authConfig, err = PromptUserForCredentials(ctx, cli, "", "", authConfig.Username, indexServer)
+		if err != nil {
+			return "", err
+		}
+		return registrytypes.EncodeAuthConfig(authConfig)
+	}
+}
+
 // ResolveAuthConfig returns auth-config for the given registry from the
 // credential-store. It returns an empty AuthConfig if no credentials were
 // found.
@@ -44,7 +82,8 @@ const authConfigKey = "https://index.docker.io/v1/"
 //
 // [registry.ResolveAuthConfig]: https://pkg.go.dev/github.com/docker/[email protected]+incompatible/registry#ResolveAuthConfig
 func ResolveAuthConfig(cfg *configfile.ConfigFile, index *registrytypes.IndexInfo) registrytypes.AuthConfig {
-	configKey := index.Name
+	indexServer := index.Name
+	configKey := getAuthConfigKey(indexServer)
 	if index.Official {
 		configKey = authConfigKey
 	}
@@ -57,6 +96,7 @@ func ResolveAuthConfig(cfg *configfile.ConfigFile, index *registrytypes.IndexInf
 // If credentials for given serverAddress exists in the credential store, the configuration will be populated with values in it
 func GetDefaultAuthConfig(cfg *configfile.ConfigFile, checkCredStore bool, serverAddress string, isDefaultRegistry bool) (registrytypes.AuthConfig, error) {
 	if !isDefaultRegistry {
+		// FIXME(thaJeztah): should the same logic be used for getAuthConfigKey ?? Looks like we're normalizing things here, but not elsewhere? why?
 		serverAddress = credentials.ConvertToHostname(serverAddress)
 	}
 	authCfg := configtypes.AuthConfig{}
@@ -83,6 +123,8 @@ func GetDefaultAuthConfig(cfg *configfile.ConfigFile, checkCredStore bool, serve
 // If defaultUsername is not empty, the username prompt includes that username
 // and the user can hit enter without inputting a username  to use that default
 // username.
+//
+// TODO(thaJeztah): cli Cli could be a Streams if it was not for cli.SetIn to be needed?
 func PromptUserForCredentials(ctx context.Context, cli Cli, argUser, argPassword, defaultUsername, serverAddress string) (registrytypes.AuthConfig, error) {
 	// On Windows, force the use of the regular OS stdin stream.
 	//
@@ -174,6 +216,9 @@ func PromptUserForCredentials(ctx context.Context, cli Cli, argUser, argPassword
 // base64url encoded ([RFC 4648, Section 5]) JSON string for sending through
 // the "X-Registry-Auth" header.
 //
+// FIXME(thaJeztah): do we need a variant like this, but with "indexServer" (domainName) as input?
+// TODO(thaJeztah): should this accept an image ref-type, and use instead of ResolveAuthConfig
+//
 // [RFC 4648, Section 5]: https://tools.ietf.org/html/rfc4648#section-5
 func RetrieveAuthTokenFromImage(cfg *configfile.ConfigFile, image string) (string, error) {
 	registryRef, err := reference.ParseNormalizedNamed(image)