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header.go
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/
header.go
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// Copyright (C) 2021 Mya Pitzeruse
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
package auth
import (
"strings"
"go.pitz.tech/lib/headers"
)
const authorization = "authorization"
// Get retrieves the current authorization value from the header.
func Get(header headers.Header, expectedScheme string) (string, error) {
value := header.Get(authorization)
if value == "" {
return "", ErrUnauthorized
}
parts := strings.SplitN(value, " ", 2)
if len(parts) < 2 {
return "", ErrUnauthorized
}
if !strings.EqualFold(parts[0], expectedScheme) {
return "", ErrUnauthorized
}
return parts[1], nil
}