fix(caddyfile): Prevent parser to panic when no token were added by empty {block} (#7543)

caddyconfig/caddyfile/parse.go

@@ -507,7 +507,7 @@ func (p *parser) doImport(nesting int) error {
 		// format, won't check for nesting correctness or any other error, that's what parser does.
 		if !maybeSnippet && nesting == 0 {
 			// first of the line
-			if i == 0 || isNextOnNewLine(tokensCopy[i-1], token) {
+			if i == 0 || isNextOnNewLine(tokensCopy[len(tokensCopy)-1], token) {
 				index = 0
 			} else {
 				index++

caddytest/integration/caddyfile_adapt/import_block_snippet_non_replaced_block_from_separate_file.caddyfiletest

@@ -0,0 +1,52 @@
+import testdata/issue_7518_unused_block_panic_snippets.conf
+
+example.com {
+	import snippet
+}
+----------
+{
+	"apps": {
+		"http": {
+			"servers": {
+				"srv0": {
+					"listen": [
+						":443"
+					],
+					"routes": [
+						{
+							"match": [
+								{
+									"host": [
+										"example.com"
+									]
+								}
+							],
+							"handle": [
+								{
+									"handler": "subroute",
+									"routes": [
+										{
+											"handle": [
+												{
+													"handler": "headers",
+													"response": {
+														"set": {
+															"Reverse_proxy": [
+																"localhost:3000"
+															]
+														}
+													}
+												}
+											]
+										}
+									]
+								}
+							],
+							"terminal": true
+						}
+					]
+				}
+			}
+		}
+	}
+}

caddytest/integration/testdata/issue_7518_unused_block_panic_snippets.conf

@@ -0,0 +1,15 @@
+# Used by import_block_snippet_non_replaced_block_from_separate_file.caddyfiletest
+
+(snippet) {
+	header {
+		reverse_proxy localhost:3000
+		{block}
+	}
+}
+
+# This snippet being unused by the test Caddyfile is intentional.
+# This is to test that a panic runtime error triggered by an out-of-range slice index access
+# will not happen again, please see issue #7518 and pull request #7543 for more information
+(unused_snippet) {
+    header SomeHeader SomeValue
+}