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package auth
import (
"fmt"
"net/http"
"golang.org/x/oauth2"
)
type authCodeFn func(string) func() string
func NewOauthClient(clientId, clientSecret, tokenFile string, authFn authCodeFn) (*http.Client, error) {
conf := &oauth2.Config{
ClientID: clientId,
ClientSecret: clientSecret,
Scopes: []string{"https://www.googleapis.com/auth/drive"},
RedirectURL: "urn:ietf:wg:oauth:2.0:oob",
Endpoint: oauth2.Endpoint{
AuthURL: "https://accounts.google.com/o/oauth2/auth",
TokenURL: "https://accounts.google.com/o/oauth2/token",
},
}
// Read cached token
token, exists, err := ReadToken(tokenFile)
if err != nil {
return nil, fmt.Errorf("Failed to read token: %s", err)
}
// Require auth code if token file does not exist
// or refresh token is missing
if !exists || token.RefreshToken == "" {
authUrl := conf.AuthCodeURL("state", oauth2.AccessTypeOffline)
authCode := authFn(authUrl)()
token, err = conf.Exchange(oauth2.NoContext, authCode)
if err != nil {
return nil, fmt.Errorf("Failed to exchange auth code for token: %s", err)
}
}
return oauth2.NewClient(
oauth2.NoContext,
FileSource(tokenFile, token, conf),
), nil
}
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