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fbauth.go
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fbauth.go
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package fbauth
import (
"context"
"log"
"os"
firebase "firebase.google.com/go"
"firebase.google.com/go/auth"
"github.com/jphacks/F_2002_1/go/domain/entity"
"golang.org/x/oauth2/google"
"google.golang.org/api/option"
)
func GetUIDByToken(idToken string) (string, error) {
ctx, client, err := fbConnect()
if err != nil {
return "", err
}
token, err := client.VerifyIDToken(ctx, idToken)
if err != nil {
log.Printf("error verifying ID token: %v\n", err)
return "", entity.ErrInvalidIdToken
}
return token.UID, nil
}
func fbConnect() (context.Context, *auth.Client, error) {
ctx := context.Background()
credentials, err := google.CredentialsFromJSON(ctx, []byte(os.Getenv("FIREBASE_SDK_CREDENTIALS")))
if err != nil {
log.Printf("error credentials from json: %v\n", err)
return nil, nil, err
}
opt := option.WithCredentials(credentials)
app, err := firebase.NewApp(context.Background(), nil, opt)
if err != nil {
log.Printf("error initializing app: %v", err)
return nil, nil, err
}
client, err := app.Auth(ctx)
if err != nil {
log.Printf("error getting Fb client: %n", err)
return nil, nil, err
}
return ctx, client, nil
}