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) }