From 5247643f02358b40d01385b0dbf743b659b0133f Mon Sep 17 00:00:00 2001
From: Andrew Richardson <andrew.richardson@kaleido.io>
Date: Thu, 23 Jun 2022 17:34:55 -0400
Subject: [PATCH] Recurse into arrays when converting keys to lowercase

Fixes #1386

Signed-off-by: Andrew Richardson <andrew.richardson@kaleido.io>
---
 util.go       | 33 +++++++++++++++++++++++----------
 viper_test.go | 11 +++++++++--
 2 files changed, 32 insertions(+), 12 deletions(-)

diff --git a/util.go b/util.go
index ee7a86d..64e6575 100644
--- a/util.go
+++ b/util.go
@@ -64,18 +64,25 @@ func copyAndInsensitiviseMap(m map[string]interface{}) map[string]interface{} {
 	return nm
 }
 
+func insensitiviseVal(val interface{}) interface{} {
+	switch val.(type) {
+	case map[interface{}]interface{}:
+		// nested map: cast and recursively insensitivise
+		val = cast.ToStringMap(val)
+		insensitiviseMap(val.(map[string]interface{}))
+	case map[string]interface{}:
+		// nested map: recursively insensitivise
+		insensitiviseMap(val.(map[string]interface{}))
+	case []interface{}:
+		// nested array: recursively insensitivise
+		insensitiveArray(val.([]interface{}))
+	}
+	return val
+}
+
 func insensitiviseMap(m map[string]interface{}) {
 	for key, val := range m {
-		switch val.(type) {
-		case map[interface{}]interface{}:
-			// nested map: cast and recursively insensitivise
-			val = cast.ToStringMap(val)
-			insensitiviseMap(val.(map[string]interface{}))
-		case map[string]interface{}:
-			// nested map: recursively insensitivise
-			insensitiviseMap(val.(map[string]interface{}))
-		}
-
+		val = insensitiviseVal(val)
 		lower := strings.ToLower(key)
 		if key != lower {
 			// remove old key (not lower-cased)
@@ -86,6 +93,12 @@ func insensitiviseMap(m map[string]interface{}) {
 	}
 }
 
+func insensitiveArray(a []interface{}) {
+	for i, val := range a {
+		a[i] = insensitiviseVal(val)
+	}
+}
+
 func absPathify(logger Logger, inPath string) string {
 	logger.Info("trying to resolve absolute path", "path", inPath)
 
diff --git a/viper_test.go b/viper_test.go
index c41a1e7..2a3dabc 100644
--- a/viper_test.go
+++ b/viper_test.go
@@ -2516,7 +2516,10 @@ func TestKeyDelimiter(t *testing.T) {
 }
 
 var yamlDeepNestedSlices = []byte(`TV:
-- title: "The expanse"
+- title: "The Expanse"
+  title_i18n:
+    USA: "The Expanse"
+    Japan: "エクスパンス -巨獣めざめる-"
   seasons:
   - first_released: "December 14, 2015"
     episodes:
@@ -2546,11 +2549,15 @@ func TestSliceIndexAccess(t *testing.T) {
 	err := v.unmarshalReader(r, v.config)
 	require.NoError(t, err)
 
-	assert.Equal(t, "The expanse", v.GetString("tv.0.title"))
+	assert.Equal(t, "The Expanse", v.GetString("tv.0.title"))
 	assert.Equal(t, "February 1, 2017", v.GetString("tv.0.seasons.1.first_released"))
 	assert.Equal(t, "Static", v.GetString("tv.0.seasons.1.episodes.2.title"))
 	assert.Equal(t, "December 15, 2015", v.GetString("tv.0.seasons.0.episodes.1.air_date"))
 
+	// Test nested keys with capital letters
+	assert.Equal(t, "The Expanse", v.GetString("tv.0.title_i18n.USA"))
+	assert.Equal(t, "エクスパンス -巨獣めざめる-", v.GetString("tv.0.title_i18n.Japan"))
+
 	// Test for index out of bounds
 	assert.Equal(t, "", v.GetString("tv.0.seasons.2.first_released"))