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user.go
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user.go
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package hn
import (
"encoding/json"
"errors"
"fmt"
"html"
"strings"
"time"
)
// User is based on https://github.com/HackerNews/API#users
type User struct {
ID string `json:"id"`
Delay int `json:"delay"`
Created time.Time `json:"created"`
Karma int `json:"karma"`
About string `json:"about"`
Submitted []int `json:"submitted"`
}
var (
errUserUnmarshalID = errors.New("user unmarshal failed on 'id' field")
errUserUnmarshalDelay = errors.New("user unmarshal failed on 'delay' field")
errUserUnmarshalCreated = errors.New("user unmarshal failed on 'created' field")
errUserUnmarshalKarma = errors.New("user unmarshal failed on 'karma' field")
errUserUnmarshalAbout = errors.New("user unmarshal failed on 'about' field")
errUserUnmarshalSubmitted = errors.New("user unmarshal failed on 'submitted' field")
errUserUnmarshalUnknownKey = errors.New("user unmarshal failed on unknown key")
)
func (u *User) UnmarshalJSON(b []byte) error {
input := map[string]interface{}{}
if err := json.Unmarshal(b, &input); err != nil {
return fmt.Errorf("json.Unmarshal: %w", err)
}
for k, v := range input {
switch strings.ToLower(k) {
case "id":
strID, ok := v.(string)
if !ok {
return fmt.Errorf("%w: %v", errUserUnmarshalID, v)
}
u.ID = strID
case "delay":
intDelay, ok := v.(int)
if !ok {
return fmt.Errorf("%w: %v", errUserUnmarshalDelay, v)
}
u.Delay = intDelay
case "created":
floatCreated, ok := v.(float64)
if !ok {
return fmt.Errorf("%w: %v", errUserUnmarshalCreated, v)
}
u.Created = time.Unix(int64(floatCreated), 0)
case "karma":
floatKarma, ok := v.(float64)
if !ok {
return fmt.Errorf("%w: %v", errUserUnmarshalKarma, v)
}
u.Karma = int(floatKarma)
case "about":
strAbout, ok := v.(string)
if !ok {
return fmt.Errorf("%w: %v", errUserUnmarshalAbout, v)
}
u.About = html.UnescapeString(strAbout)
case "submitted":
ret := []int{}
submitted, ok := v.([]interface{})
if !ok {
return fmt.Errorf("%w: %v", errUserUnmarshalSubmitted, v)
}
for _, s := range submitted {
f, ok := s.(float64)
if !ok {
return fmt.Errorf("%w: %v", errUserUnmarshalSubmitted, v)
}
ret = append(ret, int(f))
}
u.Submitted = ret
default:
return fmt.Errorf("%w: %v", errUserUnmarshalUnknownKey, strings.ToLower(k))
}
}
return nil
}