chore: make deps, go mod vendor

vendor/github.com/go-viper/mapstructure/v2/mapstructure.go

@@ -266,6 +266,10 @@ type DecoderConfig struct {
 	// defaults to "mapstructure"
 	TagName string
 
+	// The option of the value in the tag that indicates a field should
+	// be squashed. This defaults to "squash".
+	SquashTagOption string
+
 	// IgnoreUntaggedFields ignores all struct fields without explicit
 	// TagName, comparable to `mapstructure:"-"` as default behaviour.
 	IgnoreUntaggedFields bool
@@ -274,6 +278,10 @@ type DecoderConfig struct {
 	// field name or tag. Defaults to `strings.EqualFold`. This can be used
 	// to implement case-sensitive tag values, support snake casing, etc.
 	MatchName func(mapKey, fieldName string) bool
+
+	// DecodeNil, if set to true, will cause the DecodeHook (if present) to run
+	// even if the input is nil. This can be used to provide default values.
+	DecodeNil bool
 }
 
 // A Decoder takes a raw interface value and turns it into structured
@@ -283,7 +291,8 @@ type DecoderConfig struct {
 // structure. The top-level Decode method is just a convenience that sets
 // up the most basic Decoder.
 type Decoder struct {
-	config *DecoderConfig
+	config           *DecoderConfig
+	cachedDecodeHook func(from reflect.Value, to reflect.Value) (interface{}, error)
 }
 
 // Metadata contains information about decoding a structure that
@@ -401,6 +410,10 @@ func NewDecoder(config *DecoderConfig) (*Decoder, error) {
 		config.TagName = "mapstructure"
 	}
 
+	if config.SquashTagOption == "" {
+		config.SquashTagOption = "squash"
+	}
+
 	if config.MatchName == nil {
 		config.MatchName = strings.EqualFold
 	}
@@ -408,6 +421,9 @@ func NewDecoder(config *DecoderConfig) (*Decoder, error) {
 	result := &Decoder{
 		config: config,
 	}
+	if config.DecodeHook != nil {
+		result.cachedDecodeHook = cachedDecodeHook(config.DecodeHook)
+	}
 
 	return result, nil
 }
@@ -426,19 +442,26 @@ func (d *Decoder) Decode(input interface{}) error {
 	return err
 }
 
+// isNil returns true if the input is nil or a typed nil pointer.
+func isNil(input interface{}) bool {
+	if input == nil {
+		return true
+	}
+	val := reflect.ValueOf(input)
+	return val.Kind() == reflect.Ptr && val.IsNil()
+}
+
 // Decodes an unknown data type into a specific reflection value.
 func (d *Decoder) decode(name string, input interface{}, outVal reflect.Value) error {
-	var inputVal reflect.Value
-	if input != nil {
-		inputVal = reflect.ValueOf(input)
-
-		// We need to check here if input is a typed nil. Typed nils won't
-		// match the "input == nil" below so we check that here.
-		if inputVal.Kind() == reflect.Ptr && inputVal.IsNil() {
-			input = nil
-		}
+	var (
+		inputVal   = reflect.ValueOf(input)
+		outputKind = getKind(outVal)
+		decodeNil  = d.config.DecodeNil && d.cachedDecodeHook != nil
+	)
+	if isNil(input) {
+		// Typed nils won't match the "input == nil" below, so reset input.
+		input = nil
 	}
-
 	if input == nil {
 		// If the data is nil, then we don't set anything, unless ZeroFields is set
 		// to true.
@@ -449,30 +472,46 @@ func (d *Decoder) decode(name string, input interface{}, outVal reflect.Value) e
 				d.config.Metadata.Keys = append(d.config.Metadata.Keys, name)
 			}
 		}
-		return nil
-	}
-
-	if !inputVal.IsValid() {
-		// If the input value is invalid, then we just set the value
-		// to be the zero value.
-		outVal.Set(reflect.Zero(outVal.Type()))
-		if d.config.Metadata != nil && name != "" {
-			d.config.Metadata.Keys = append(d.config.Metadata.Keys, name)
+		if !decodeNil {
+			return nil
+		}
+	}
+	if !inputVal.IsValid() {
+		if !decodeNil {
+			// If the input value is invalid, then we just set the value
+			// to be the zero value.
+			outVal.Set(reflect.Zero(outVal.Type()))
+			if d.config.Metadata != nil && name != "" {
+				d.config.Metadata.Keys = append(d.config.Metadata.Keys, name)
+			}
+			return nil
+		}
+		// Hooks need a valid inputVal, so reset it to zero value of outVal type.
+		switch outputKind {
+		case reflect.Struct, reflect.Map:
+			var mapVal map[string]interface{}
+			inputVal = reflect.ValueOf(mapVal) // create nil map pointer
+		case reflect.Slice, reflect.Array:
+			var sliceVal []interface{}
+			inputVal = reflect.ValueOf(sliceVal) // create nil slice pointer
+		default:
+			inputVal = reflect.Zero(outVal.Type())
 		}
-		return nil
 	}
 
-	if d.config.DecodeHook != nil {
+	if d.cachedDecodeHook != nil {
 		// We have a DecodeHook, so let's pre-process the input.
 		var err error
-		input, err = DecodeHookExec(d.config.DecodeHook, inputVal, outVal)
+		input, err = d.cachedDecodeHook(inputVal, outVal)
 		if err != nil {
 			return fmt.Errorf("error decoding '%s': %w", name, err)
 		}
 	}
+	if isNil(input) {
+		return nil
+	}
 
 	var err error
-	outputKind := getKind(outVal)
 	addMetaKey := true
 	switch outputKind {
 	case reflect.Bool:
@@ -753,8 +792,8 @@ func (d *Decoder) decodeBool(name string, data interface{}, val reflect.Value) e
 		}
 	default:
 		return fmt.Errorf(
-			"'%s' expected type '%s', got unconvertible type '%s', value: '%v'",
-			name, val.Type(), dataVal.Type(), data)
+			"'%s' expected type '%s', got unconvertible type '%#v', value: '%#v'",
+			name, val, dataVal, data)
 	}
 
 	return nil
@@ -973,7 +1012,7 @@ func (d *Decoder) decodeMapFromStruct(name string, dataVal reflect.Value, val re
 			}
 
 			// If "squash" is specified in the tag, we squash the field down.
-			squash = squash || strings.Index(tagValue[index+1:], "squash") != -1
+			squash = squash || strings.Contains(tagValue[index+1:], d.config.SquashTagOption)
 			if squash {
 				// When squashing, the embedded type can be a pointer to a struct.
 				if v.Kind() == reflect.Ptr && v.Elem().Kind() == reflect.Struct {
@@ -1351,7 +1390,7 @@ func (d *Decoder) decodeStructFromMap(name string, dataVal, val reflect.Value) e
 			// We always parse the tags cause we're looking for other tags too
 			tagParts := strings.Split(fieldType.Tag.Get(d.config.TagName), ",")
 			for _, tag := range tagParts[1:] {
-				if tag == "squash" {
+				if tag == d.config.SquashTagOption {
 					squash = true
 					break
 				}
@@ -1363,10 +1402,15 @@ func (d *Decoder) decodeStructFromMap(name string, dataVal, val reflect.Value) e
 			}
 
 			if squash {
-				if fieldVal.Kind() != reflect.Struct {
-					errs = append(errs, fmt.Errorf("%s: unsupported type for squash: %s", fieldType.Name, fieldVal.Kind()))
-				} else {
+				switch fieldVal.Kind() {
+				case reflect.Struct:
 					structs = append(structs, fieldVal)
+				case reflect.Interface:
+					if !fieldVal.IsNil() {
+						structs = append(structs, fieldVal.Elem().Elem())
+					}
+				default:
+					errs = append(errs, fmt.Errorf("%s: unsupported type for squash: %s", fieldType.Name, fieldVal.Kind()))
 				}
 				continue
 			}