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// Copyright 2023 The Sigstore Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package base
import (
"context"
"fmt"
"regexp"
"strings"
"github.com/google/go-cmp/cmp/cmpopts"
"github.com/sigstore/fulcio/pkg/config"
"github.com/sigstore/fulcio/pkg/identity"
)
var (
// For testing
CmpOptions = cmpopts.IgnoreUnexported(baseIssuer{})
)
type baseIssuer struct {
issuerURL string
}
func Issuer(issuerURL string) identity.Issuer {
return &baseIssuer{issuerURL: issuerURL}
}
// This is unimplemented for the base issuer, and should be implemented unique to each issuer
func (e *baseIssuer) Authenticate(ctx context.Context, token string, opts ...config.InsecureOIDCConfigOption) (identity.Principal, error) { //nolint: revive
return nil, fmt.Errorf("unimplemented")
}
// Match is the same across issuers, so it doesn't need to be implemented anywhere else
func (e *baseIssuer) Match(_ context.Context, url string) bool {
if url == e.issuerURL {
return true
}
// If this is a MetaIssuer the issuer URL could be a regex
// Check if the regex is valid against the provided url
re, err := metaRegex(e.issuerURL)
if err != nil {
return false
}
return re.MatchString(url)
}
func metaRegex(issuer string) (*regexp.Regexp, error) {
// Quote all of the "meta" characters like `.` to avoid
// those literal characters in the URL matching any character.
// This will ALSO quote `*`, so we replace the quoted version.
quoted := regexp.QuoteMeta(issuer)
// Replace the quoted `*` with a regular expression that
// will match alpha-numeric parts with common additional
// "special" characters.
replaced := strings.ReplaceAll(quoted, regexp.QuoteMeta("*"), "[-_a-zA-Z0-9]+")
// Compile into a regular expression.
return regexp.Compile(replaced)
}
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