func getSptFromCachedToken(oauthConfig azure.OAuthConfig, clientID, resource string, callbacks ...azure.TokenRefreshCallback) (*azure.ServicePrincipalToken, error) {
token, err := azure.LoadToken(tokenCachePath)
if err != nil {
return nil, fmt.Errorf("failed to load token from cache: %v", err)
}
spt, _ := azure.NewServicePrincipalTokenFromManualToken(
oauthConfig,
clientID,
resource,
*token,
callbacks...)
return spt, nil
}
// tokenFromFile returns a token from the specified file if it is found, otherwise
// returns nil. Any error retrieving or creating the token is returned as an error.
func tokenFromFile(say func(string), oauthCfg azure.OAuthConfig, tokenPath, clientID, resource string,
callback azure.TokenRefreshCallback) (*azure.ServicePrincipalToken, error) {
say(fmt.Sprintf("Loading auth token from file: %s", tokenPath))
if _, err := os.Stat(tokenPath); err != nil {
if os.IsNotExist(err) { // file not found
return nil, nil
}
return nil, err
}
token, err := azure.LoadToken(tokenPath)
if err != nil {
return nil, fmt.Errorf("Failed to load token from file: %v", err)
}
spt, err := azure.NewServicePrincipalTokenFromManualToken(oauthCfg, clientID, resource, *token, callback)
if err != nil {
return nil, fmt.Errorf("Error constructing service principal token: %v", err)
}
return spt, nil
}