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|
package util
import (
"errors"
"fmt"
"net/url"
"reflect"
"strconv"
"strings"
jsoniter "github.com/json-iterator/go"
)
func IsSimpleType(f reflect.Value) bool {
switch f.Interface().(type) {
case fmt.Stringer:
return true
}
switch f.Kind() {
case reflect.Bool, reflect.Int, reflect.Int64, reflect.Uint, reflect.Uint64, reflect.String:
return true
}
return false
}
func SimpleTypeToParam(f reflect.Value) string {
switch cast := f.Interface().(type) {
case fmt.Stringer:
return cast.String()
}
switch f.Kind() {
case reflect.Bool:
return strconv.FormatBool(f.Bool())
case reflect.Int, reflect.Int64:
// f.Int() is always an int64
return strconv.FormatInt(f.Int(), 10)
case reflect.Uint, reflect.Uint64:
// f.Uint() is always an uint64
return strconv.FormatUint(f.Uint(), 10)
case reflect.String:
return f.String()
}
panic("the input parameter is not a simple type")
}
func Changed(o interface{}, fieldName string) bool {
r := reflect.ValueOf(o)
value := reflect.Indirect(r).FieldByName(fieldName)
return !value.IsNil()
}
func ToParams(o interface{}) (url.Values, error) {
params := url.Values{}
if o == nil || reflect.ValueOf(o).IsNil() {
return params, nil
}
json := jsoniter.ConfigCompatibleWithStandardLibrary
s := reflect.ValueOf(o)
if reflect.Ptr == s.Kind() {
s = s.Elem()
}
sType := s.Type()
for i := 0; i < s.NumField(); i++ {
fieldName := sType.Field(i).Name
if !Changed(o, fieldName) {
continue
}
fieldName = strings.ToLower(fieldName)
f := s.Field(i)
if reflect.Ptr == f.Kind() {
f = f.Elem()
}
switch {
case IsSimpleType(f):
params.Set(fieldName, SimpleTypeToParam(f))
case f.Kind() == reflect.Slice:
for i := 0; i < f.Len(); i++ {
elem := f.Index(i)
if IsSimpleType(elem) {
params.Add(fieldName, SimpleTypeToParam(elem))
} else {
return nil, errors.New("slices must contain only simple types")
}
}
case f.Kind() == reflect.Map:
lowerCaseKeys := make(map[string][]string)
iter := f.MapRange()
for iter.Next() {
lowerCaseKeys[iter.Key().Interface().(string)] = iter.Value().Interface().([]string)
}
s, err := json.MarshalToString(lowerCaseKeys)
if err != nil {
return nil, err
}
params.Set(fieldName, s)
}
}
return params, nil
}
|
