我当时正在使用Gmail的Quickstart应用程序从电子邮件帐户中提取标签,但我希望有一种方法可以更改代码,以便始终显示登录页面。有一次性授权,但是我想知道是否有一种方法可以在每次启动应用程序时提示授权。我一直在使用的代码可以在这里找到:https://developers.google.com/gmail/api/quickstart/go
我还将附上以下代码。任何帮助将不胜感激。
package main
import (
"encoding/json"
"fmt"
"io/ioutil"
"log"
"net/http"
"os"
"golang.org/x/net/context"
"golang.org/x/oauth2"
"golang.org/x/oauth2/google"
"google.golang.org/api/gmail/v1"
)
// Retrieve a token, saves the token, then returns the generated client.
func getClient(config *oauth2.Config) *http.Client {
// The file token.json stores the user's access and refresh tokens, and is
// created automatically when the authorization flow completes for the first
// time.
tokFile := "token.json"
tok, err := tokenFromFile(tokFile)
if err != nil {
tok = getTokenFromWeb(config)
saveToken(tokFile, tok)
}
return config.Client(context.Background(), tok)
}
// Request a token from the web, then returns the retrieved token.
func getTokenFromWeb(config *oauth2.Config) *oauth2.Token {
authURL := config.AuthCodeURL("state-token", oauth2.AccessTypeOffline)
fmt.Printf("Go to the following link in your browser then type the "+
"authorization code: \n%v\n", authURL)
var authCode string
if _, err := fmt.Scan(&authCode); err != nil {
log.Fatalf("Unable to read authorization code: %v", err)
}
tok, err := config.Exchange(context.TODO(), authCode)
if err != nil {
log.Fatalf("Unable to retrieve token from web: %v", err)
}
return tok
}
// Retrieves a token from a local file.
func tokenFromFile(file string) (*oauth2.Token, error) {
f, err := os.Open(file)
if err != nil {
return nil, err
}
defer f.Close()
tok := &oauth2.Token{}
err = json.NewDecoder(f).Decode(tok)
return tok, err
}
// Saves a token to a file path.
func saveToken(path string, token *oauth2.Token) {
fmt.Printf("Saving credential file to: %s\n", path)
f, err := os.OpenFile(path, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0600)
if err != nil {
log.Fatalf("Unable to cache oauth token: %v", err)
}
defer f.Close()
json.NewEncoder(f).Encode(token)
}
func main() {
b, err := ioutil.ReadFile("credentials.json")
if err != nil {
log.Fatalf("Unable to read client secret file: %v", err)
}
// If modifying these scopes, delete your previously saved token.json.
config, err := google.ConfigFromJSON(b, gmail.GmailReadonlyScope)
if err != nil {
log.Fatalf("Unable to parse client secret file to config: %v", err)
}
client := getClient(config)
srv, err := gmail.New(client)
if err != nil {
log.Fatalf("Unable to retrieve Gmail client: %v", err)
}
user := "me"
r, err := srv.Users.Labels.List(user).Do()
if err != nil {
log.Fatalf("Unable to retrieve labels: %v", err)
}
if len(r.Labels) == 0 {
fmt.Println("No labels found.")
return
}
fmt.Println("Labels:")
for _, l := range r.Labels {
fmt.Printf("- %s\n", l.Name)
}
}
答案 0 :(得分:1)
我的帐户被锁定了,所以这就是我所做的。
首先,在主要方法上,我添加了:
if exists("token.json") {
os.Remove("token.json")
}
然后,我创建了该方法:
func exists(filename string) bool {
info, err := os.Stat(filename)
if os.IsNotExist(err) {
return false
}
return !info.IsDir()
}