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client.go
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client.go
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package applesignin
import (
"context"
"fmt"
"net/http"
"net/url"
"strings"
"time"
"github.com/dgrijalva/jwt-go/v4"
jsoniter "github.com/json-iterator/go"
"github.com/lestrrat-go/jwx/jwk"
"github.com/pkg/errors"
"github.com/albenik-go/apple-sign-in/jwkproxy"
)
const (
baseURL = "https://appleid.apple.com"
authURL = baseURL + "/auth/authorize"
tokenURL = baseURL + "/auth/token"
audience = baseURL
userAgent = "apple-signin-client-go/1.0"
MaxExpiration = 15777000 * time.Second // half a year
ResponseModeQuery = "query"
ResponseModePost = "form_post"
ScopeEmail = "email"
ScopeName = "name"
)
type Client struct {
audience string
teamID string
clientID string
keyID string
keyData interface{}
RedirectURL string
userAgent string
baseURL string
http *http.Client
jwtparser *jwt.Parser
jwk jwkproxy.Interface
}
// New instatinates a new client.
// Arguments: tid — teamID, cid — clientID, kid — keyID.
func New(tid, cid, kid string, key interface{}, opts ...func(c *Client)) *Client {
c := &Client{
audience: audience,
teamID: tid,
clientID: cid,
keyID: kid,
keyData: key,
RedirectURL: "",
userAgent: userAgent,
baseURL: tokenURL,
http: &http.Client{},
jwtparser: jwt.NewParser(jwt.WithoutAudienceValidation()),
jwk: jwkproxy.NewInMemory(jwkproxy.NewLoader(), time.Hour),
}
for _, o := range opts {
o(c)
}
return c
}
func (c *Client) AuthURL(mode string, scopes []string, state, nonce string) string {
q := url.Values{
"response_type": []string{"code"},
"response_mode": []string{mode},
"client_id": []string{c.clientID},
"scope": []string{strings.Join(scopes, " ")}, // "name email"
"redirect_uri": []string{c.RedirectURL},
"state": []string{state},
"nonce": []string{nonce},
}
return authURL + "?" + q.Encode()
}
func (c *Client) ValidateCode(code, nonce string, exp time.Duration) (*TokenResponse, error) {
return c.ValidateCodeContext(context.Background(), code, nonce, exp)
}
func (c *Client) ValidateCodeContext(ctx context.Context, code, nonce string, exp time.Duration) (*TokenResponse, error) { //nolint:lll
const errmsg = "authorization code validation error"
res, err := c.doRequest(ctx, &validateTokenRequest{
apiRequest: apiRequest{
ClientID: c.clientID,
GrantType: "authorization_code",
},
Code: code,
RedirectURI: c.RedirectURL,
}, exp)
if err != nil {
return nil, errors.Wrap(err, errmsg)
}
if res.IDToken == nil { // not impossible by docs, but all possible in real life
return nil, errors.Wrap(ErrIDTokenMissing, errmsg)
}
if res.IDToken.NonceSupported && res.IDToken.Nonce != nonce {
return nil, errors.Wrap(ErrNonceMismatch, errmsg)
}
return res, nil
}
func (c *Client) ValidateRefreshToken(token string, exp time.Duration) (*TokenResponse, error) {
return c.ValidateRefreshTokenContext(context.Background(), token, exp)
}
func (c *Client) ValidateRefreshTokenContext(ctx context.Context, token string, exp time.Duration) (*TokenResponse, error) { //nolint:lll
token2, err := c.doRequest(ctx, &refreshTokenRequest{
apiRequest: apiRequest{
ClientID: c.clientID,
GrantType: "refresh_token",
},
RefreshToken: token,
}, exp)
if err != nil {
return nil, errors.Wrap(err, "refresh token validation error")
}
return token2, nil
}
func (c *Client) ParseIDToken(token string) (*IDTokenClaims, error) {
return c.ParseIDTokenContext(context.Background(), token)
}
func (c *Client) ParseIDTokenContext(ctx context.Context, token string) (*IDTokenClaims, error) {
claims := new(IDTokenClaims)
if _, err := c.jwtparser.ParseWithClaims(token, claims, func(token *jwt.Token) (interface{}, error) {
keys, err := c.jwk.FetchKeysContext(ctx)
if err != nil {
return nil, errors.Wrap(err, "cannot load apple public keys")
}
if kid, ok := token.Header["kid"]; ok {
if alg, ok := token.Header["alg"]; ok {
for iter := keys.Iterate(ctx); iter.Next(ctx); {
pair := iter.Pair()
key, ok := pair.Value.(jwk.Key)
if ok && key.KeyID() == kid && key.Algorithm() == alg {
var keydata interface{}
if err := key.Raw(&keydata); err != nil {
return nil, errors.Wrap(err, "cannot decode key data")
}
return keydata, nil
}
}
}
}
return nil, ErrNoSuitableJWK
}); err != nil {
return nil, errors.Wrap(err, "ID token parse error")
}
return claims, nil
}
func (c *Client) doRequest(ctx context.Context, req request, exp time.Duration) (*TokenResponse, error) {
if exp > MaxExpiration {
return nil, errors.Wrap(ErrSecretExpirationTimeTooFar, "cannot retrieve token")
}
now := time.Now()
token := jwt.NewWithClaims(jwt.SigningMethodES256, jwt.MapClaims{
"iss": c.teamID,
"iat": now.Unix(),
"exp": now.Add(exp).Unix(),
"aud": c.audience,
"sub": c.clientID,
})
token.Header["kid"] = c.keyID
secret, err := token.SignedString(c.keyData)
if err != nil {
return nil, errors.Wrap(err, "token signed string error")
}
req.SetSecret(secret) // nolint:wsl
httpreq, err := http.NewRequestWithContext(ctx, http.MethodPost, c.baseURL, strings.NewReader(req.Encode()))
if err != nil {
return nil, errors.Wrap(err, "cannot prepare request")
}
httpreq.Header.Set("Content-Type", "application/x-www-form-urlencoded")
httpreq.Header.Set("Accept-Header", "application/json")
httpreq.Header.Set("User-Agent", c.userAgent)
resp, err := c.http.Do(httpreq)
if err != nil {
return nil, errors.Wrap(err, "http request failed")
}
defer resp.Body.Close()
if resp.StatusCode == http.StatusOK {
var t tokenResponseRaw
if err = jsoniter.NewDecoder(resp.Body).Decode(&t); err != nil {
return nil, errors.Wrap(err, "cannot parse error response json")
}
var id *IDTokenClaims
if id, err = c.ParseIDTokenContext(ctx, t.IDToken); err != nil { //nolint:wsl
return nil, err
}
return &TokenResponse{
ExpiresIn: t.ExpiresIn,
IDToken: id,
AccessToken: t.AccessToken,
RefreshToken: t.RefreshToken,
TokenType: t.TokenType,
}, nil
}
if resp.StatusCode == http.StatusBadRequest {
payload := new(ErrorResponse)
if err = jsoniter.NewDecoder(resp.Body).Decode(payload); err != nil {
return nil, errors.Wrap(err, "cannot parse error response json")
}
return nil, errors.Wrap(payload, "auth error") //nolint:wsl
}
body, err := readResponseBodyText(resp)
if err != nil {
body = fmt.Sprintf("body read error: %s", err)
}
return nil, errors.Errorf("unexpected http response code %d: %q", resp.StatusCode, body) //nolint:wsl
}