From e18818489d4487bec13e0e8cfe6fc7e0e15d771a Mon Sep 17 00:00:00 2001
From: Zheng Xi Zhou <zzxwill@gmail.com>
Date: Sun, 18 Apr 2021 16:30:22 +0800
Subject: [PATCH] Fix panic when calling ParseHCL

In function ParseHCL, not all fields of tfconfig.Module is checked,
so panic will happen.

Fix #https://github.com/hashicorp/terraform-config-inspect/issues/61
---
 tfconfig/load_hcl.go | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/tfconfig/load_hcl.go b/tfconfig/load_hcl.go
index cb59ce6..a1a0c90 100644
--- a/tfconfig/load_hcl.go
+++ b/tfconfig/load_hcl.go
@@ -62,6 +62,10 @@ func LoadModuleFromFile(file *hcl.File, mod *Module) hcl.Diagnostics {
 		switch block.Type {
 
 		case "terraform":
+
+			if mod.RequiredCore == nil  || mod.RequiredProviders == nil  {
+				break
+			}
 			content, _, contentDiags := block.Body.PartialContent(terraformBlockSchema)
 			diags = append(diags, contentDiags...)
 
@@ -104,6 +108,10 @@ func LoadModuleFromFile(file *hcl.File, mod *Module) hcl.Diagnostics {
 			}
 
 		case "variable":
+
+			if mod.Variables == nil {
+				break
+			}
 			content, _, contentDiags := block.Body.PartialContent(variableSchema)
 			diags = append(diags, contentDiags...)
 
@@ -177,6 +185,9 @@ func LoadModuleFromFile(file *hcl.File, mod *Module) hcl.Diagnostics {
 
 		case "output":
 
+			if mod.Outputs == nil {
+				break
+			}
 			content, _, contentDiags := block.Body.PartialContent(outputSchema)
 			diags = append(diags, contentDiags...)
 
@@ -204,6 +215,9 @@ func LoadModuleFromFile(file *hcl.File, mod *Module) hcl.Diagnostics {
 
 		case "provider":
 
+			if mod.RequiredProviders == nil || mod.ProviderConfigs == nil {
+				break
+			}
 			content, _, contentDiags := block.Body.PartialContent(providerConfigSchema)
 			diags = append(diags, contentDiags...)
 
@@ -239,6 +253,10 @@ func LoadModuleFromFile(file *hcl.File, mod *Module) hcl.Diagnostics {
 
 		case "resource", "data":
 
+			if mod.ManagedResources == nil || mod.DataResources == nil {
+				break
+			}
+
 			content, _, contentDiags := block.Body.PartialContent(resourceSchema)
 			diags = append(diags, contentDiags...)
 
@@ -318,6 +336,10 @@ func LoadModuleFromFile(file *hcl.File, mod *Module) hcl.Diagnostics {
 
 		case "module":
 
+			if mod.ModuleCalls == nil {
+				break
+			}
+
 			content, _, contentDiags := block.Body.PartialContent(moduleCallSchema)
 			diags = append(diags, contentDiags...)