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package goanilist
import (
"database/sql"
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"log"
"net/http"
"net/url"
"time"
)
const API_URL = "https://anilist.co/api/"
var (
ErrAnilistCoupled = errors.New("Anilist is already coupled!")
ErrAnilistNotCoupled = errors.New("Anilist is not coupled")
)
var httpClient = &http.Client{}
type Client struct {
db *sql.DB
user int
id string
secret string
token string
refreshToken string
tokenExpires int64
IsCoupled bool
}
func NewClient(db *sql.DB, user int, id, secret string) *Client {
c := &Client{
db: db,
user: user,
id: id,
secret: secret,
}
err := db.QueryRow("SELECT token, refresh_token, expires_at FROM login.anilist_api_tokens WHERE user_id = $1;", user).Scan(&c.token, &c.refreshToken, &c.tokenExpires)
c.IsCoupled = err == nil
return c
}
func (c *Client) AuthorizeURL() string {
return fmt.Sprintf("%sauth/authorize?grant_type=%s&client_id=%s&response_type=%s",
API_URL,
"authorization_pin",
url.QueryEscape(c.id),
"pin")
}
func (c *Client) NeedsToRenew() bool {
t := time.Now().UTC().Unix()
return t > (c.tokenExpires - 60) //60 seconds of buffer time
}
func (c *Client) CoupleByPin(pin string) error {
if c.IsCoupled {
return ErrAnilistCoupled
}
res := AccessTokenResult{}
err := c.post("auth/access_token", url.Values{
"grant_type": {"authorization_pin"},
"client_id": {c.id},
"client_secret": {c.secret},
"code": {pin},
}, &res)
switch res.Error {
case "invalid_request":
err = errors.New("Der eingegebene Code ist nicht korrekt. Bitte prüfe, ob du ihn richtig kopiert hast.")
}
if err != nil {
return err
}
_, err = c.db.Exec("INSERT INTO login.anilist_api_tokens (user_id, token, refresh_token, expires_at) VALUES ($1, $2, $3, $4);", c.user, res.AccessToken, res.RefreshToken, res.Expires)
if err != nil {
return err
}
c.token = res.AccessToken
c.refreshToken = res.RefreshToken
c.tokenExpires = res.Expires
return nil
}
func (c *Client) RenewToken() error {
if !c.IsCoupled {
return ErrAnilistNotCoupled
}
if !c.NeedsToRenew() {
return nil
}
log.Println("Token expired, get new token..")
res := AccessTokenResult{}
err := c.post("auth/access_token", url.Values{
"grant_type": {"refresh_token"},
"client_id": {c.id},
"client_secret": {c.secret},
"refresh_token": {c.refreshToken},
}, &res)
if err != nil {
return err
}
_, err = c.db.Exec("UPDATE login.anilist_api_tokens SET token = $1, expires_at = $2 WHERE user_id = $3;", res.AccessToken, res.Expires, c.user)
if err != nil {
return err
}
c.token = res.AccessToken
c.tokenExpires = res.Expires
return nil
}
func (c *Client) User() (*UserResult, error) {
if !c.IsCoupled {
return nil, ErrAnilistNotCoupled
}
if err := c.RenewToken(); err != nil {
return nil, err
}
res := &UserResult{}
err := c.get("user", res)
if err != nil {
return nil, err
}
return res, nil
}
func (c *Client) post(path string, values url.Values, result interface{}) error {
resp, err := http.PostForm(fmt.Sprintf("%s%s", API_URL, path), values)
if err != nil {
return err
}
return c.handleResponse(resp, path, values, result)
}
func (c *Client) get(path string, result interface{}) error {
req, err := http.NewRequest("GET", fmt.Sprintf("%s%s", API_URL, path), nil)
if err != nil {
return err
}
req.Header.Add("Authorization", "Bearer "+c.token)
resp, err := httpClient.Do(req)
if err != nil {
return err
}
return c.handleResponse(resp, path, url.Values{}, result)
}
func (c *Client) handleResponse(resp *http.Response, path string, values url.Values, result interface{}) error {
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return err
}
err = json.Unmarshal(body, result)
if err != nil {
log.Println(string(body))
return err
}
resErr := result.(APIError).Get()
resErr.ParseRawError()
if resp.StatusCode != 200 {
log.Printf("%s: %v -> %s\n", path, values, resp.Status)
if resErr.Error != "" {
log.Printf("%v\n", resErr)
return errors.New(fmt.Sprintf("%s: %s", resErr.Error, resErr.ErrorMessage))
} else {
return errors.New(resp.Status)
}
}
return nil
}
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