97 lines
2.8 KiB
Go
97 lines
2.8 KiB
Go
/*
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Copyright Docker attest authors
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package mapping
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import (
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"fmt"
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v1 "github.com/google/go-containerregistry/pkg/v1"
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)
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type matchType string
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const (
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MatchTypePolicy matchType = "policy"
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MatchTypeMatchNoPolicy matchType = "match_no_policy"
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MatchTypeNoMatch matchType = "no_match"
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)
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type PolicyMatch struct {
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MatchType matchType
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Policy *PolicyMapping
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Rule *PolicyRule
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MatchedName string
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}
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func (mappings *PolicyMappings) FindPolicyMatch(imageName string, platform *v1.Platform) (*PolicyMatch, error) {
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if mappings == nil {
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return &PolicyMatch{MatchType: MatchTypeNoMatch, MatchedName: imageName}, nil
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}
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return mappings.findPolicyMatchImpl(imageName, platform, make(map[*PolicyRule]bool))
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}
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func (mappings *PolicyMappings) findPolicyMatchImpl(imageName string, platform *v1.Platform, matched map[*PolicyRule]bool) (*PolicyMatch, error) {
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for _, rule := range mappings.Rules {
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if !rule.matchesPlatform(platform) {
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continue
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}
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if rule.Pattern.MatchString(imageName) {
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switch {
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case rule.PolicyID == "" && rule.Replacement == "":
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return nil, fmt.Errorf("rule %s has neither policy-id nor rewrite", rule.Pattern)
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case rule.PolicyID != "" && rule.Replacement != "":
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return nil, fmt.Errorf("rule %s has both policy-id and rewrite", rule.Pattern)
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case rule.PolicyID != "":
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policy := mappings.Policies[rule.PolicyID]
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if policy != nil {
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return &PolicyMatch{
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MatchType: MatchTypePolicy,
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Policy: policy,
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Rule: rule,
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MatchedName: imageName,
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}, nil
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}
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return &PolicyMatch{
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MatchType: MatchTypeMatchNoPolicy,
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Rule: rule,
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MatchedName: imageName,
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}, nil
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case rule.Replacement != "":
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if matched[rule] {
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return nil, fmt.Errorf("rewrite loop detected")
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}
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matched[rule] = true
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imageName = rule.Pattern.ReplaceAllString(imageName, rule.Replacement)
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return mappings.findPolicyMatchImpl(imageName, platform, matched)
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}
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}
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}
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return &PolicyMatch{MatchType: MatchTypeNoMatch}, nil
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}
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func (rule *PolicyRule) matchesPlatform(platform *v1.Platform) bool {
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if len(rule.Platforms) == 0 {
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return true
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}
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for i := range rule.Platforms {
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if rule.Platforms[i].Equals(*platform) {
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return true
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}
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}
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return false
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}
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