feat: Add ent-based sqlite3 storage

Signed-off-by: m.nabokikh <maksim.nabokikh@flant.com>

storage/ent/client/devicerequest.go

@@ -0,0 +1,36 @@
+package client
+
+import (
+	"context"
+
+	"github.com/dexidp/dex/storage"
+	"github.com/dexidp/dex/storage/ent/db/devicerequest"
+)
+
+// CreateDeviceRequest saves provided device request into the database.
+func (d *Database) CreateDeviceRequest(request storage.DeviceRequest) error {
+	_, err := d.client.DeviceRequest.Create().
+		SetClientID(request.ClientID).
+		SetClientSecret(request.ClientSecret).
+		SetScopes(request.Scopes).
+		SetUserCode(request.UserCode).
+		SetDeviceCode(request.DeviceCode).
+		// Save utc time into database because ent doesn't support comparing dates with different timezones
+		SetExpiry(request.Expiry.UTC()).
+		Save(context.TODO())
+	if err != nil {
+		return convertDBError("create device request: %w", err)
+	}
+	return nil
+}
+
+// GetDeviceRequest extracts a device request from the database by user code.
+func (d *Database) GetDeviceRequest(userCode string) (storage.DeviceRequest, error) {
+	deviceRequest, err := d.client.DeviceRequest.Query().
+		Where(devicerequest.UserCode(userCode)).
+		Only(context.TODO())
+	if err != nil {
+		return storage.DeviceRequest{}, convertDBError("get device request: %w", err)
+	}
+	return toStorageDeviceRequest(deviceRequest), nil
+}