DecodeStruct validates `input` struct with `validator` and set it into viper `tag` represent the fields when setting config, and the fields with `tag` shall prevail. `input` must be a pointer
(output *viper.Viper, input interface{}, data map[string]interface{}, tag string)
| 31 | // `tag` represent the fields when setting config, and the fields with `tag` shall prevail. |
| 32 | // `input` must be a pointer |
| 33 | func DecodeStruct(output *viper.Viper, input interface{}, data map[string]interface{}, tag string) errors.Error { |
| 34 | // update fields from request body |
| 35 | err := Decode(data, input, validator.New()) |
| 36 | if err != nil { |
| 37 | return err |
| 38 | } |
| 39 | |
| 40 | vf := reflect.ValueOf(input) |
| 41 | if vf.Kind() != reflect.Ptr { |
| 42 | return errors.Default.New(fmt.Sprintf("input %v is not a pointer", input)) |
| 43 | } |
| 44 | |
| 45 | for _, f := range utils.WalkFields(reflect.Indirect(vf).Type(), nil) { |
| 46 | fieldName := f.Name |
| 47 | fieldType := f.Type |
| 48 | fieldTag := f.Tag.Get(tag) |
| 49 | |
| 50 | // Check if the first letter is uppercase (indicates a public element, accessible) |
| 51 | ascii := rune(fieldName[0]) |
| 52 | if int(ascii) < int('A') || int(ascii) > int('Z') { |
| 53 | continue |
| 54 | } |
| 55 | |
| 56 | // View their tags in order to filter out members who don't have a valid tag set |
| 57 | if fieldTag == "" { |
| 58 | continue |
| 59 | } |
| 60 | vfField := vf.Elem().FieldByName(fieldName) |
| 61 | switch fieldType.Kind() { |
| 62 | case reflect.String: |
| 63 | output.Set(fieldTag, vfField.String()) |
| 64 | case reflect.Int, reflect.Int64: |
| 65 | output.Set(fieldTag, vfField.Int()) |
| 66 | case reflect.Float64, reflect.Float32: |
| 67 | output.Set(fieldTag, vfField.Float()) |
| 68 | case reflect.Bool: |
| 69 | output.Set(fieldTag, vfField.Bool()) |
| 70 | case reflect.Slice: |
| 71 | elemType := vfField.Type().Elem().Kind() |
| 72 | switch elemType { |
| 73 | case reflect.String: |
| 74 | output.Set(fieldTag, vfField.Interface().([]string)) |
| 75 | case reflect.Int: |
| 76 | output.Set(fieldTag, vfField.Interface().([]int)) |
| 77 | } |
| 78 | case reflect.Map: |
| 79 | keyType := vfField.Type().Key().Kind() |
| 80 | elemType := vfField.Type().Elem().Kind() |
| 81 | if keyType == reflect.String { |
| 82 | switch elemType { |
| 83 | case reflect.String: |
| 84 | output.Set(fieldTag, vfField.Interface().(map[string]string)) |
| 85 | case reflect.Interface: |
| 86 | output.Set(fieldTag, vfField.Interface().(map[string]interface{})) |
| 87 | } |
| 88 | } |
| 89 | default: |
| 90 | } |