Add PublicExtraInfo interface to more selectively output the extra field

Author: Maed223

internal/command/views/json/diagnostic.go

@@ -144,13 +144,18 @@ func NewDiagnostic(diag tfdiags.Diagnostic, sources map[string][]byte) *Diagnost
 	}
 
 	desc := diag.Description()
+	extra := diag.ExtraInfo()
+	var publicExtra tfdiags.PublicExtraInfo
+	if e, ok := extra.(tfdiags.PublicExtraInfo); ok {
+		publicExtra = e
+	}
 
 	diagnostic := &Diagnostic{
 		Severity: sev,
 		Summary:  desc.Summary,
 		Detail:   desc.Detail,
 		Address:  desc.Address,
-		Extra:    diag.ExtraInfo(),
+		Extra:    publicExtra,
 	}
 
 	sourceRefs := diag.Source()

internal/configs/module_deprecations.go

@@ -32,6 +32,8 @@ type ModuleDeprecationDiagnosticExtra struct {
 	Deprecations []*ModuleDeprecationDiagnosticExtraDeprecationItem `json:"deprecations"`
 }
 
+func (m *ModuleDeprecationDiagnosticExtra) IsPublic() {}
+
 type ModuleDeprecationDiagnosticExtraDeprecationItem struct {
 	Version            string `json:"version"`
 	SourceName         string `json:"source_name"`

internal/tfdiags/diagnostic.go

@@ -65,3 +65,8 @@ type FromExpr struct {
 	Expression  hcl.Expression
 	EvalContext *hcl.EvalContext
 }
+
+// PublicExtraInfo is an interface for marking Extra field that contain public extra information
+type PublicExtraInfo interface {
+	IsPublic()
+}