Make API not depend on SDK (#18962)

api/plugin_types.go

@@ -0,0 +1,63 @@
+package api
+
+// NOTE: this file was copied from
+// https://github.com/hashicorp/vault/blob/main/sdk/helper/consts/plugin_types.go
+// Any changes made should be made to both files at the same time.
+
+import "fmt"
+
+var PluginTypes = []PluginType{
+	PluginTypeUnknown,
+	PluginTypeCredential,
+	PluginTypeDatabase,
+	PluginTypeSecrets,
+}
+
+type PluginType uint32
+
+// This is a list of PluginTypes used by Vault.
+// If we need to add any in the future, it would
+// be best to add them to the _end_ of the list below
+// because they resolve to incrementing numbers,
+// which may be saved in state somewhere. Thus if
+// the name for one of those numbers changed because
+// a value were added to the middle, that could cause
+// the wrong plugin types to be read from storage
+// for a given underlying number. Example of the problem
+// here: https://play.golang.org/p/YAaPw5ww3er
+const (
+	PluginTypeUnknown PluginType = iota
+	PluginTypeCredential
+	PluginTypeDatabase
+	PluginTypeSecrets
+)
+
+func (p PluginType) String() string {
+	switch p {
+	case PluginTypeUnknown:
+		return "unknown"
+	case PluginTypeCredential:
+		return "auth"
+	case PluginTypeDatabase:
+		return "database"
+	case PluginTypeSecrets:
+		return "secret"
+	default:
+		return "unsupported"
+	}
+}
+
+func ParsePluginType(pluginType string) (PluginType, error) {
+	switch pluginType {
+	case "unknown":
+		return PluginTypeUnknown, nil
+	case "auth":
+		return PluginTypeCredential, nil
+	case "database":
+		return PluginTypeDatabase, nil
+	case "secret":
+		return PluginTypeSecrets, nil
+	default:
+		return PluginTypeUnknown, fmt.Errorf("%q is not a supported plugin type", pluginType)
+	}
+}