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sso.go
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sso.go
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package sso
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"net/http"
"net/url"
"strings"
"github.com/golang-jwt/jwt"
)
const TOKEN_ENDPOINT = "https://api.sso.cateiru.com/v1/oauth/token"
const PUBLIC_KEY_ENDPOINT = "https://api.sso.cateiru.com/v1/oauth/jwt/key"
type PublicKey struct {
Pkcs8 string `json:"pkcs8"`
}
type TokenResponse struct {
AccessToken string `json:"access_token"`
TokenType string `json:"token_type"`
RefreshToken string `json:"refresh_token"`
ExpiresIn int `json:"expires_in"`
IDToken string `json:"id_token"`
}
type Claims struct {
Name string `json:"name"`
GivenName string `json:"given_name"`
FamilyName string `json:"family_name"`
MiddleName string `json:"middle_name"`
NickName string `json:"nick_name"`
PreferredUserName string `json:"preferred_username"`
Profile string `json:"profile"`
Picture string `json:"picture"`
Website string `json:"website"`
Email string `json:"email"`
EmailVerified bool `json:"email_verified"`
Gender string `json:"gender"`
Birthdate string `json:"birthdate"`
Zoneinfo string `json:"zoneinfo"`
Locale string `json:"locale"`
PhoneNumber string `json:"phone_number"`
PhoneNumberVerified bool `json:"phone_number_verified"`
UpdatedAt int64 `json:"updated_at"`
ID string `json:"id"`
Role string `json:"role"`
Theme string `json:"theme"`
Iat int64 `json:"iat"`
AuthTime int64 `json:"auth_time"`
jwt.StandardClaims
}
// Get JWT Public key.
func GetPublicKey() (string, error) {
res, err := http.DefaultClient.Get(PUBLIC_KEY_ENDPOINT)
if err != nil {
return "", err
}
if res.StatusCode != 200 {
return "", errors.New("connection failed")
}
defer res.Body.Close()
buf := new(bytes.Buffer)
buf.ReadFrom(res.Body)
var r PublicKey
if err := json.Unmarshal(buf.Bytes(), &r); err != nil {
return "", err
}
return r.Pkcs8, nil
}
func GetToken(code string, redirect string, tokenSecret string) (*TokenResponse, error) {
encodedCode := url.QueryEscape(code)
encodedRedirect := url.QueryEscape(redirect)
uri := fmt.Sprintf("%s?grant_type=authorization_code&code=%s&redirect_uri=%s",
TOKEN_ENDPOINT, encodedCode, encodedRedirect)
req, err := http.NewRequest("GET", uri, nil)
if err != nil {
return nil, err
}
req.Header.Set("Authorization", fmt.Sprintf("Basic %s", tokenSecret))
res, err := http.DefaultClient.Do(req)
if err != nil {
return nil, err
}
if res.StatusCode != 200 {
return nil, errors.New("connection failed")
}
defer res.Body.Close()
buf := new(bytes.Buffer)
buf.ReadFrom(res.Body)
var r TokenResponse
if err := json.Unmarshal(buf.Bytes(), &r); err != nil {
return nil, err
}
return &r, nil
}
func Refresh(refreshToken string, clientId string, clientSecret string, scope []string) (*TokenResponse, error) {
encodedRefreshToken := url.QueryEscape(refreshToken)
encodedClientId := url.QueryEscape(clientId)
encodedClientSecret := url.QueryEscape(clientSecret)
encodedScope := url.QueryEscape(strings.Join(scope, " "))
uri := fmt.Sprintf("%s?grant_ype=refresh_token&client_id=%s&client_secret=%s&refresh_token=%s&scope=%s",
TOKEN_ENDPOINT, encodedClientId, encodedClientSecret, encodedRefreshToken, encodedScope)
res, err := http.DefaultClient.Get(uri)
if err != nil {
return nil, err
}
if res.StatusCode != 200 {
return nil, errors.New("connection failed")
}
defer res.Body.Close()
buf := new(bytes.Buffer)
buf.ReadFrom(res.Body)
var r TokenResponse
if err := json.Unmarshal(buf.Bytes(), &r); err != nil {
return nil, err
}
return &r, nil
}
func ValidateIDToken(idToken string) (*Claims, error) {
pks8, err := GetPublicKey()
if err != nil {
return nil, err
}
verifyKey, err := jwt.ParseRSAPublicKeyFromPEM([]byte(pks8))
if err != nil {
return nil, err
}
var claims Claims
token, err := jwt.ParseWithClaims(idToken, &claims, func(t *jwt.Token) (interface{}, error) {
if _, ok := t.Method.(*jwt.SigningMethodRSA); !ok {
return nil, fmt.Errorf("Unexpected signing method: %v", t.Header["alg"])
}
return verifyKey, nil
})
if err != nil {
return nil, err
}
if !token.Valid {
return nil, errors.New("IDToken is not valid")
}
return &claims, nil
}