WIP: parse mime

mime.go

@@ -0,0 +1,65 @@
+package pmcrypto
+
+import (
+	"net/mail"
+	"strings"
+	"net/textproto"
+	"io/ioutil"
+	"bytes"
+	"mimeparser"
+)
+
+func parseMIME(mimeBody string) (body *mimeparser.BodyCollector, atts, attHeaders []string, err error) {
+
+	mm, err := mail.ReadMessage(strings.NewReader(mimeBody))
+	if err != nil {
+		return
+	}
+
+	h := textproto.MIMEHeader(mm.Header)
+	mmBodyData, err := ioutil.ReadAll(mm.Body)
+
+	printAccepter := mimeparser.NewMIMEPrinter()
+	bodyCollector := mimeparser.NewBodyCollector(printAccepter)
+	attachmentsCollector := mimeparser.NewAttachmentsCollector(bodyCollector)
+	err = mimeparser.VisitAll(bytes.NewReader(mmBodyData), h, attachmentsCollector)
+
+	body = bodyCollector
+	atts = attachmentsCollector.GetAttachments()
+	attHeaders = attachmentsCollector.GetAttHeaders()
+
+	return
+}
+
+
+
+// define call back interface
+type MIMECallbacks interface {
+	onBody(body string, mimetype string)
+	onAttachment(headers string, data []byte)
+	// Encrypted headers can be an attachment and thus be placed at the end of the mime structure
+	onEncryptedHeaders(headers string)
+}
+
+func (o *OpenPGP) decryptMIMEMessage(encryptedText string, verifierKey string, privateKeys []byte,
+		passphrase string, callbacks MIMECallbacks, verifyTime int64) (verifier int, err error) {
+	decsignverify, error := o.DecryptMessageVerifyPrivbinkeys(encryptedText, verifierKey, privateKeys, passphrase, verifyTime)
+	if (error != nil) {
+		return 0, error
+	}
+
+	body, attachments, attachmentHeaders, error := parseMIME(decsignverify.Plaintext
+	if (error != nil) {
+		return 0, error
+	})
+	bodyContent, bodyMimeType := body.GetBody()
+	callbacks.onBody(bodyContent, bodyMimeType)
+	for i := 0; i < len(attachments); i++ {
+		callbacks.onAttachment(attachmentHeaders[i], []byte(attachments[i]))
+	}
+	callbacks.onEncryptedHeaders("")
+
+	// Todo verify the signature included in the attachment
+
+	return verifier, nil
+}