init: pristine aerc 0.20.0 source

lib/crypto/crypto.go

@@ -0,0 +1,60 @@
+package crypto
+
+import (
+	"bytes"
+	"io"
+
+	"git.sr.ht/~rjarry/aerc/config"
+	"git.sr.ht/~rjarry/aerc/lib/crypto/gpg"
+	"git.sr.ht/~rjarry/aerc/lib/crypto/pgp"
+	"git.sr.ht/~rjarry/aerc/lib/log"
+	"git.sr.ht/~rjarry/aerc/models"
+	"github.com/ProtonMail/go-crypto/openpgp"
+	"github.com/emersion/go-message/mail"
+)
+
+type Provider interface {
+	Decrypt(io.Reader, openpgp.PromptFunction) (*models.MessageDetails, error)
+	Encrypt(*bytes.Buffer, []string, string, openpgp.PromptFunction, *mail.Header) (io.WriteCloser, error)
+	Sign(*bytes.Buffer, string, openpgp.PromptFunction, *mail.Header) (io.WriteCloser, error)
+	ImportKeys(io.Reader) error
+	Init() error
+	Close()
+	GetSignerKeyId(string) (string, error)
+	GetKeyId(string) (string, error)
+	ExportKey(string) (io.Reader, error)
+}
+
+func New() Provider {
+	switch config.General.PgpProvider {
+	case "auto":
+		internal := &pgp.Mail{}
+		if internal.KeyringExists() {
+			log.Debugf("internal pgp keyring exists")
+			return internal
+		}
+		log.Debugf("no internal pgp keyring, using system gpg")
+		fallthrough
+	case "gpg":
+		return &gpg.Mail{}
+	case "internal":
+		return &pgp.Mail{}
+	default:
+		return nil
+	}
+}
+
+func IsEncrypted(bs *models.BodyStructure) bool {
+	if bs == nil {
+		return false
+	}
+	if bs.MIMEType == "application" && bs.MIMESubType == "pgp-encrypted" {
+		return true
+	}
+	for _, part := range bs.Parts {
+		if IsEncrypted(part) {
+			return true
+		}
+	}
+	return false
+}