| 20 | } |
| 21 | |
| 22 | func (c *customTokenSource) Token() (*oauth2.Token, error) { |
| 23 | v := url.Values{} |
| 24 | if c.refreshToken != "" { |
| 25 | v.Set("grant_type", "refresh_token") |
| 26 | v.Set("refresh_token", c.refreshToken) |
| 27 | } else { |
| 28 | v.Set("grant_type", "client_credentials") |
| 29 | } |
| 30 | |
| 31 | v.Set("client_id", c.config.ClientID) |
| 32 | v.Set("client_secret", c.config.ClientSecret) |
| 33 | |
| 34 | req, err := http.NewRequestWithContext(c.ctx, http.MethodPost, c.config.TokenURL, strings.NewReader(v.Encode())) |
| 35 | if err != nil { |
| 36 | return nil, err |
| 37 | } |
| 38 | req.Header.Set("Content-Type", "application/x-www-form-urlencoded") |
| 39 | |
| 40 | resp, err := http.DefaultClient.Do(req) |
| 41 | if err != nil { |
| 42 | return nil, err |
| 43 | } |
| 44 | defer resp.Body.Close() |
| 45 | |
| 46 | if resp.StatusCode != http.StatusOK { |
| 47 | return nil, errors.New("oauth2: cannot fetch token") |
| 48 | } |
| 49 | |
| 50 | var tokenResp struct { |
| 51 | Code int `json:"code"` |
| 52 | Msg string `json:"msg"` |
| 53 | Data struct { |
| 54 | AccessToken string `json:"access_token"` |
| 55 | ExpiresIn int64 `json:"expires_in"` |
| 56 | TokenType string `json:"token_type"` |
| 57 | Scope string `json:"scope"` |
| 58 | RefreshToken string `json:"refresh_token"` |
| 59 | } `json:"data"` |
| 60 | } |
| 61 | |
| 62 | if err := json.NewDecoder(resp.Body).Decode(&tokenResp); err != nil { |
| 63 | return nil, err |
| 64 | } |
| 65 | |
| 66 | if tokenResp.Code != 1 { |
| 67 | return nil, errors.New("oauth2: server response error") |
| 68 | } |
| 69 | |
| 70 | c.refreshToken = tokenResp.Data.RefreshToken |
| 71 | |
| 72 | token := &oauth2.Token{ |
| 73 | AccessToken: tokenResp.Data.AccessToken, |
| 74 | TokenType: tokenResp.Data.TokenType, |
| 75 | RefreshToken: tokenResp.Data.RefreshToken, |
| 76 | Expiry: time.Now().Add(time.Duration(tokenResp.Data.ExpiresIn) * time.Second), |
| 77 | } |
| 78 | |
| 79 | return token, nil |