Recurse into arrays when converting keys to lowercase

Fixes #1386

Signed-off-by: Andrew Richardson <[email protected]>

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 _, val := range a {
+		insensitiviseVal(val)
+	}
+}
+
 func absPathify(logger Logger, inPath string) string {
 	logger.Info("trying to resolve absolute path", "path", inPath)
 

viper_test.go

@@ -2517,6 +2517,7 @@ func TestKeyDelimiter(t *testing.T) {
 
 var yamlDeepNestedSlices = []byte(`TV:
 - title: "The expanse"
+  originalNetwork: "syfy"
   seasons:
   - first_released: "December 14, 2015"
     episodes:
@@ -2547,6 +2548,7 @@ func TestSliceIndexAccess(t *testing.T) {
 	require.NoError(t, err)
 
 	assert.Equal(t, "The expanse", v.GetString("tv.0.title"))
+	assert.Equal(t, "syfy", v.GetString("tv.0.originalNetwork"))
 	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"))