62 lines
1.5 KiB
Go
62 lines
1.5 KiB
Go
package main
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import (
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"context"
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"fmt"
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"log"
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"os"
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"encoding/json"
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"net/http"
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"path/filepath"
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"golang.org/x/oauth2"
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)
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func getClient(config *oauth2.Config) *http.Client {
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token_file := filepath.Join(CREDENTIALS_DIR, TOKEN_FILE)
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token, err := tokenFromFile(token_file)
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if err != nil {
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token = getTokenFromWeb(config)
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saveToken(token_file, token)
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}
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return config.Client(context.Background(), token)
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}
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func getTokenFromWeb(config *oauth2.Config) *oauth2.Token {
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auth_url := config.AuthCodeURL("state-token", oauth2.AccessTypeOffline)
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fmt.Printf("Go to the following link in your browser, then type the " +
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"authorization code: \n%v\n", auth_url)
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var auth_code string
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if _, err := fmt.Scan(&auth_code) ; err != nil {
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log.Fatalf("Unable to read authorization code: %v", err)
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}
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token, err := config.Exchange(context.TODO(), auth_code)
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if err != nil {
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log.Fatalf("Unable to retrieve token from web: %v", err)
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}
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return token
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}
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func tokenFromFile(file string) (*oauth2.Token, error) {
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f, err := os.Open(file)
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if err != nil {
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return nil, err
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}
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defer f.Close()
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token := &oauth2.Token{}
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err = json.NewDecoder(f).Decode(token)
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return token, err
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}
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func saveToken(path string, token *oauth2.Token) {
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fmt.Printf("Saving credential file to: %s\n", path)
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file, err := os.OpenFile(path, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0600)
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if err != nil {
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log.Fatalf("Unable to cache oauth token: %v", err)
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}
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defer file.Close()
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json.NewEncoder(file).Encode(token)
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}
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