package lib
import (
"bytes"
"io"
"io/ioutil"
"github.com/emersion/go-message"
_ "github.com/emersion/go-message/charset"
"github.com/emersion/go-pgpmail"
"golang.org/x/crypto/openpgp"
"git.sr.ht/~sircmpwn/aerc/models"
"git.sr.ht/~sircmpwn/aerc/worker/lib"
"git.sr.ht/~sircmpwn/aerc/worker/types"
)
// This is an abstraction for viewing a message with semi-transparent PGP
// support.
type MessageView interface {
// Returns the MessageInfo for this message
MessageInfo() *models.MessageInfo
// Returns the BodyStructure for this message
BodyStructure() *models.BodyStructure
// Returns the message store that this message was originally sourced from
Store() *MessageStore
// Fetches a specific body part for this message
FetchBodyPart(part []int, cb func(io.Reader))
PGPDetails() *openpgp.MessageDetails
}
func usePGP(info *models.BodyStructure) bool {
if info.MIMEType == "application" {
if info.MIMESubType == "pgp-encrypted" ||
info.MIMESubType == "pgp-signature" {
return true
}
}
for _, part := range info.Parts {
if usePGP(part) {
return true
}
}
return false
}
type MessageStoreView struct {
messageInfo *models.MessageInfo
messageStore *MessageStore
message []byte
details *openpgp.MessageDetails
bodyStructure *models.BodyStructure
}
func NewMessageStoreView(messageInfo *models.MessageInfo,
store *MessageStore, decryptKeys openpgp.PromptFunction,
cb func(MessageView, error)) {
msv := &MessageStoreView{messageInfo, store,
nil, nil, messageInfo.BodyStructure}
if usePGP(messageInfo.BodyStructure) {
store.FetchFull([]uint32{messageInfo.Uid}, func(fm *types.FullMessage) {
reader := fm.Content.Reader
pgpReader, err := pgpmail.Read(reader, Keyring, decryptKeys, nil)
if err != nil {
cb(nil, err)
return
}
msv.message, err = ioutil.ReadAll(pgpReader.MessageDetails.UnverifiedBody)
if err != nil {
cb(nil, err)
return
}
decrypted, err := message.Read(bytes.NewBuffer(msv.message))
if err != nil {
cb(nil, err)
return
}
bs, err := lib.ParseEntityStructure(decrypted)
if err != nil {
cb(nil, err)
return
}
msv.bodyStructure = bs
msv.details = pgpReader.MessageDetails
cb(msv, nil)
})
} else {
cb(msv, nil)
}
store.Read([]uint32{messageInfo.Uid}, true, nil)
}
func (msv *MessageStoreView) MessageInfo() *models.MessageInfo {
return msv.messageInfo
}
func (msv *MessageStoreView) BodyStructure() *models.BodyStructure {
return msv.bodyStructure
}
func (msv *MessageStoreView) Store() *MessageStore {
return msv.messageStore
}
func (msv *MessageStoreView) PGPDetails() *openpgp.MessageDetails {
return msv.details
}
func (msv *MessageStoreView) FetchBodyPart(part []int, cb func(io.Reader)) {
if msv.message == nil {
msv.messageStore.FetchBodyPart(msv.messageInfo.Uid, part, cb)
return
}
buf := bytes.NewBuffer(msv.message)
msg, err := message.Read(buf)
if err != nil {
panic(err)
}
reader, err := lib.FetchEntityPartReader(msg, part)
if err != nil {
panic(err)
}
cb(reader)
}