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// Copyright (c) 2018-2022, Sylabs Inc. All rights reserved.
// This software is licensed under a 3-clause BSD license. Please consult the
// LICENSE.md file distributed with the sources of this project regarding your
// rights to use or distribute this software.
package auth
import (
"errors"
"os"
"strings"
)
var (
// ErrTokenTooShort is returned for token shorter than 200 b
ErrTokenTooShort = errors.New("token is too short to be valid")
// ErrTokenToolong is returned for token longer than 4096 b
ErrTokenToolong = errors.New("token is too large to be valid")
// ErrEmptyToken is returned for empty token string
ErrEmptyToken = errors.New("token file is empty")
// ErrTokenFileNotFound is returned when token file not found
ErrTokenFileNotFound = errors.New("authentication token file not found")
// ErrCouldntReadFile is returned for issues when reading file
ErrCouldntReadFile = errors.New("couldn't read your Sylabs authentication token")
)
// ReadToken reads a sylabs JWT auth token from a file
func ReadToken(tokenPath string) (token string, err error) {
// check if token file exist
_, err = os.Stat(tokenPath)
if os.IsNotExist(err) {
return "", ErrTokenFileNotFound
}
buf, err := os.ReadFile(tokenPath)
if err != nil {
return "", ErrCouldntReadFile
}
lines := strings.Split(string(buf), "\n")
if len(lines) < 1 {
return "", ErrEmptyToken
}
// A valid RSA signed token is at least 200 chars with no extra payload
token = lines[0]
if len(token) < 200 {
return "", ErrTokenTooShort
}
// A token should never be bigger than 4Kb - if it is we will have problems
// with header buffers
if len(token) > 4096 {
return "", ErrTokenToolong
}
return token, nil
}
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