func convertType()

in extra/aws-sdk-go/private/protocol/rest/build.go [274:353]
77 lines of code
29 McCabe index (conditional complexity)

func convertType(v reflect.Value, tag reflect.StructTag) (str string, err error) {
	v = reflect.Indirect(v)
	if !v.IsValid() {
		return "", errValueNotSet
	}

	switch value := v.Interface().(type) {
	case string:
		if tag.Get("suppressedJSONValue") == "true" && tag.Get("location") == "header" {
			value = base64.StdEncoding.EncodeToString([]byte(value))
		}
		str = value
	case []*string:
		if tag.Get("location") != "header" || tag.Get("enum") == "" {
			return "", fmt.Errorf("%T is only supported with location header and enum shapes", value)
		}
		if len(value) == 0 {
			return "", errValueNotSet
		}

		buff := &bytes.Buffer{}
		for i, sv := range value {
			if sv == nil || len(*sv) == 0 {
				continue
			}
			if i != 0 {
				buff.WriteRune(',')
			}
			item := *sv
			if strings.Index(item, `,`) != -1 || strings.Index(item, `"`) != -1 {
				item = strconv.Quote(item)
			}
			buff.WriteString(item)
		}
		str = string(buff.Bytes())
	case []byte:
		str = base64.StdEncoding.EncodeToString(value)
	case bool:
		str = strconv.FormatBool(value)
	case int64:
		str = strconv.FormatInt(value, 10)
	case float64:
		switch {
		case math.IsNaN(value):
			str = floatNaN
		case math.IsInf(value, 1):
			str = floatInf
		case math.IsInf(value, -1):
			str = floatNegInf
		default:
			str = strconv.FormatFloat(value, 'f', -1, 64)
		}
	case time.Time:
		format := tag.Get("timestampFormat")
		if len(format) == 0 {
			format = protocol.RFC822TimeFormatName
			if tag.Get("location") == "querystring" {
				format = protocol.ISO8601TimeFormatName
			}
		}
		str = protocol.FormatTime(format, value)
	case aws.JSONValue:
		if len(value) == 0 {
			return "", errValueNotSet
		}
		escaping := protocol.NoEscape
		if tag.Get("location") == "header" {
			escaping = protocol.Base64Escape
		}
		str, err = protocol.EncodeJSONValue(value, escaping)
		if err != nil {
			return "", fmt.Errorf("unable to encode JSONValue, %v", err)
		}
	default:
		err := fmt.Errorf("unsupported value for param %v (%s)", v.Interface(), v.Type())
		return "", err
	}

	return str, nil
}