auth.go
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auth.go
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	/*
	* Copyright © 2018 A Bunch Tell LLC.
	*
	* This file is part of WriteFreely.
	*
	* WriteFreely is free software: you can redistribute it and/or modify
	* it under the terms of the GNU Affero General Public License, included
	* in the LICENSE file in this source code package.
	*/

	package writefreely

	// AuthenticateUser ensures a user with the given accessToken is valid. Call
	// it before any operations that require authentication or optionally associate
	// data with a user account.
	// Returns an error if the given accessToken is invalid. Otherwise the
	// associated user ID is returned.
	func AuthenticateUser(db writestore, accessToken string) (int64, error) {
	if accessToken == "" {
	return 0, ErrNoAccessToken
	}
	userID := db.GetUserID(accessToken)
	if userID == -1 {
	return 0, ErrBadAccessToken
	}

	return userID, nil
	}