refactor out into packages for easier unit test writing

pkg/opgp/entity/entity.go

@@ -0,0 +1,89 @@
+package entity
+
+import (
+	"fmt"
+	"io"
+	"net/mail"
+
+	"github.com/sour-is/crypto/openpgp"
+	"github.com/sour-is/crypto/openpgp/packet"
+)
+
+type Key string
+
+func (k Key) Key() interface{} {
+	return k
+}
+
+type Entity struct {
+	Primary       *mail.Address
+	SelfSignature *packet.Signature
+	Emails        []*mail.Address
+	Fingerprint   string
+	Proofs        []string
+	ArmorText     string
+	entity        *openpgp.Entity
+}
+
+func (e *Entity) Serialize(f io.Writer) error {
+	return e.entity.Serialize(f)
+}
+
+func GetOne(lis openpgp.EntityList) (*Entity, error) {
+	entity := &Entity{}
+	var err error
+
+	for _, e := range lis {
+		if e == nil {
+			continue
+		}
+		if e.PrimaryKey == nil {
+			continue
+		}
+
+		entity.entity = e
+		entity.Fingerprint = fmt.Sprintf("%X", e.PrimaryKey.Fingerprint)
+
+		for name, ident := range e.Identities {
+			// Pick first identity
+			if entity.Primary == nil {
+				entity.Primary, err = mail.ParseAddress(name)
+				if err != nil {
+					return entity, err
+				}
+			}
+			// If one is marked primary use that
+			if ident.SelfSignature != nil && ident.SelfSignature.IsPrimaryId != nil && *ident.SelfSignature.IsPrimaryId {
+				entity.Primary, err = mail.ParseAddress(name)
+				if err != nil {
+					return entity, err
+				}
+
+			} else {
+				var email *mail.Address
+				if email, err = mail.ParseAddress(name); err != nil {
+					return entity, err
+				}
+				if email.Address != entity.Primary.Address {
+					entity.Emails = append(entity.Emails, email)
+				}
+			}
+
+			// If identity is self signed read notation data.
+			if ident.SelfSignature != nil && ident.SelfSignature.NotationData != nil {
+				entity.SelfSignature = ident.SelfSignature
+				// Get proofs and append to list.
+				if proofs, ok := ident.SelfSignature.NotationData["proof@metacode.biz"]; ok {
+					entity.Proofs = append(entity.Proofs, proofs...)
+				}
+			}
+		}
+		break
+	}
+
+	if entity.Primary == nil {
+		entity.Primary, _ = mail.ParseAddress("nobody@nodomain.xyz")
+	}
+
+	return entity, err
+}