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storage.go
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package authn
// <!-- START clutchdoc -->
// description: Stores tokens from the auth provider(s) in the database.
// <!-- END clutchdoc -->
import (
"context"
"github.com/uber-go/tally/v4"
"go.uber.org/zap"
"golang.org/x/oauth2"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
"google.golang.org/protobuf/types/known/anypb"
authnv1 "github.com/lyft/clutch/backend/api/config/service/authn/v1"
"github.com/lyft/clutch/backend/service"
)
const StorageName = "clutch.service.authn.storage"
func NewStorage(cfg *anypb.Any, logger *zap.Logger, scope tally.Scope) (service.Service, error) {
c := &authnv1.StorageConfig{}
if err := cfg.UnmarshalTo(c); err != nil {
return nil, err
}
return newStorage(c)
}
type storage struct {
crypto *cryptographer
repo *repository
}
func newStorage(cfg *authnv1.StorageConfig) (Storage, error) {
if cfg == nil {
return nil, nil
}
crypto, err := newCryptographer(cfg.EncryptionPassphrase)
if err != nil {
return nil, err
}
repo, err := newRepository()
if err != nil {
return nil, err
}
return &storage{
crypto: crypto,
repo: repo,
}, nil
}
func (s *storage) Store(ctx context.Context, userID, provider string, t *oauth2.Token) error {
if t == nil {
return status.Errorf(codes.InvalidArgument, "token provided for storage was nil")
} else if userID == "" || provider == "" || t.AccessToken == "" {
return status.Errorf(codes.InvalidArgument, "userID '%s', provider '%s', or access token were blank", userID, provider)
}
at, err := s.crypto.Encrypt([]byte(t.AccessToken))
if err != nil {
return err
}
dbToken := &authnToken{
userID: userID,
provider: provider,
accessToken: at,
expiry: t.Expiry,
}
// Encrypt and store refresh token if present.
if t.RefreshToken != "" {
rt, err := s.crypto.Encrypt([]byte(t.RefreshToken))
if err != nil {
return err
}
dbToken.refreshToken = rt
}
// Encrypt and store ID token if present.
if it, ok := t.Extra("id_token").(string); ok {
idToken, err := s.crypto.Encrypt([]byte(it))
if err != nil {
return err
}
dbToken.idToken = idToken
}
err = s.repo.createOrUpdateProviderToken(ctx, dbToken)
return err
}
func (s *storage) Read(ctx context.Context, userID string, provider string) (*oauth2.Token, error) {
t, err := s.repo.readProviderToken(ctx, userID, provider)
if err != nil {
return nil, err
}
at, err := s.crypto.Decrypt(t.accessToken)
if err != nil {
return nil, err
}
ret := &oauth2.Token{
AccessToken: string(at),
Expiry: t.expiry,
}
// Set refresh token if it exists on the db record.
if len(t.refreshToken) > 0 {
rt, err := s.crypto.Decrypt(t.refreshToken)
if err != nil {
return nil, err
}
ret.RefreshToken = string(rt)
}
// Set idToken if it exists on the database record.
if len(t.idToken) > 0 {
it, err := s.crypto.Decrypt(t.idToken)
if err != nil {
return nil, err
}
ret = ret.WithExtra(map[string]interface{}{"id_token": string(it)})
}
return ret, nil
}