Add platform filtering support to mapping.yml (#167)

* chore!: rename package config -> mapping
* feat: add platform filtering support to mapping.yml

mapping/types.go

@@ -0,0 +1,58 @@
+package mapping
+
+import (
+	"regexp"
+
+	v1 "github.com/google/go-containerregistry/pkg/v1"
+)
+
+type policyMappingsFile struct {
+	Version  string            `json:"version"`
+	Kind     string            `json:"kind"`
+	Policies []*PolicyMapping  `json:"policies"`
+	Rules    []*policyRuleFile `json:"rules"`
+}
+
+type policyRuleFile struct {
+	Pattern     string   `json:"pattern"`
+	Platforms   []string `json:"platforms"`
+	PolicyID    string   `json:"policy-id"`
+	Replacement string   `json:"rewrite"`
+}
+
+type PolicyMappings struct {
+	Version  string
+	Kind     string
+	Policies map[string]*PolicyMapping
+	Rules    []*PolicyRule
+}
+
+type AttestationStyle string
+
+const (
+	AttestationStyleAttached  AttestationStyle = "attached"
+	AttestationStyleReferrers AttestationStyle = "referrers"
+)
+
+type PolicyMapping struct {
+	ID           string              `json:"id"`
+	Description  string              `json:"description"`
+	Files        []PolicyMappingFile `json:"files"`
+	Attestations *AttestationConfig  `json:"attestations"`
+}
+
+type AttestationConfig struct {
+	Style AttestationStyle `json:"style"`
+	Repo  string           `json:"repo"`
+}
+
+type PolicyMappingFile struct {
+	Path string `json:"path"`
+}
+
+type PolicyRule struct {
+	Pattern     *regexp.Regexp
+	PolicyID    string
+	Replacement string
+	Platforms   []*v1.Platform
+}