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api.go
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api.go
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package oauth2
import (
"errors"
"fmt"
"net/http"
"strconv"
"time"
"gopkg.in/chanxuehong/wechat.v2/internal/debug/api"
)
// ExchangeToken 通过 code 换取网页授权 access_token.
// NOTE: 返回的 token == clt.Token
func (clt *Client) ExchangeToken(code string) (token *Token, err error) {
if clt.Endpoint == nil {
err = errors.New("nil Client.Endpoint")
return
}
var tk *Token
if clt.TokenStorage != nil {
if tk, _ = clt.TokenStorage.Token(); tk == nil {
tk = clt.Token
} else {
clt.Token = tk // update local
}
} else {
tk = clt.Token
}
if tk == nil {
tk = new(Token)
}
if err = clt.updateToken(tk, clt.Endpoint.ExchangeTokenURL(code)); err != nil {
return
}
if err = clt.putToken(tk); err != nil {
return
}
token = tk
return
}
// RefreshToken 刷新 access_token.
// NOTE:
// 1. refreshToken 可以为空.
// 2. 返回的 token == clt.Token
func (clt *Client) RefreshToken(refreshToken string) (token *Token, err error) {
if clt.Endpoint == nil {
err = errors.New("nil Client.Endpoint")
return
}
var tk *Token
if refreshToken == "" {
if tk, err = clt.GetToken(false); err != nil {
return
}
refreshToken = tk.RefreshToken
} else {
tk = new(Token)
}
if err = clt.updateToken(tk, clt.Endpoint.RefreshTokenURL(refreshToken)); err != nil {
return
}
if err = clt.putToken(tk); err != nil {
return
}
token = tk
return
}
func (clt *Client) updateToken(tk *Token, url string) (err error) {
api.DebugPrintGetRequest(url)
httpResp, err := clt.httpClient().Get(url)
if err != nil {
return
}
defer httpResp.Body.Close()
if httpResp.StatusCode != http.StatusOK {
return fmt.Errorf("http.Status: %s", httpResp.Status)
}
var result struct {
Error
Token
}
if err = api.DecodeJSONHttpResponse(httpResp.Body, &result); err != nil {
return
}
if result.ErrCode != ErrCodeOK {
return &result.Error
}
// 由于网络的延时 和 分布式服务器之间的时间可能不是绝对同步, access_token 过期时间留了一个缓冲区
switch {
case result.ExpiresIn > 31556952: // 60*60*24*365.2425
return errors.New("expires_in too large: " + strconv.FormatInt(result.ExpiresIn, 10))
case result.ExpiresIn > 60*60:
result.ExpiresIn -= 60 * 20
case result.ExpiresIn > 60*30:
result.ExpiresIn -= 60 * 10
case result.ExpiresIn > 60*15:
result.ExpiresIn -= 60 * 5
case result.ExpiresIn > 60*5:
result.ExpiresIn -= 60
case result.ExpiresIn > 60:
result.ExpiresIn -= 20
default:
return errors.New("expires_in too small: " + strconv.FormatInt(result.ExpiresIn, 10))
}
tk.AccessToken = result.AccessToken
tk.CreatedAt = time.Now().Unix()
tk.ExpiresIn = result.ExpiresIn
if result.RefreshToken != "" {
tk.RefreshToken = result.RefreshToken
}
if result.OpenId != "" {
tk.OpenId = result.OpenId
}
if result.UnionId != "" {
tk.UnionId = result.UnionId
}
if result.Scope != "" {
tk.Scope = result.Scope
}
return
}