package widgets import ( "bufio" "errors" "fmt" "io" "os" "os/exec" "regexp" "strings" "github.com/danwakefield/fnmatch" "github.com/gdamore/tcell/v2" "github.com/google/shlex" "github.com/mattn/go-runewidth" "git.sr.ht/~rjarry/aerc/config" "git.sr.ht/~rjarry/aerc/lib" "git.sr.ht/~rjarry/aerc/lib/format" "git.sr.ht/~rjarry/aerc/lib/ui" "git.sr.ht/~rjarry/aerc/models" ) var ansi = regexp.MustCompile("\x1B\\[[0-?]*[ -/]*[@-~]") var _ ProvidesMessages = (*MessageViewer)(nil) type MessageViewer struct { ui.Invalidatable acct *AccountView conf *config.AercConfig err error grid *ui.Grid switcher *PartSwitcher msg lib.MessageView uiConfig config.UIConfig } type PartSwitcher struct { ui.Invalidatable parts []*PartViewer selected int showHeaders bool alwaysShowMime bool height int mv *MessageViewer } func NewMessageViewer(acct *AccountView, conf *config.AercConfig, msg lib.MessageView) *MessageViewer { hf := HeaderLayoutFilter{ layout: HeaderLayout(conf.Viewer.HeaderLayout), keep: func(msg *models.MessageInfo, header string) bool { return fmtHeader(msg, header, "2") != "" }, } layout := hf.forMessage(msg.MessageInfo()) header, headerHeight := layout.grid( func(header string) ui.Drawable { return &HeaderView{ conf: conf, Name: header, Value: fmtHeader(msg.MessageInfo(), header, acct.UiConfig().TimestampFormat), uiConfig: acct.UiConfig(), } }, ) rows := []ui.GridSpec{ {ui.SIZE_EXACT, ui.Const(headerHeight)}, } if msg.PGPDetails() != nil { height := 1 if msg.PGPDetails().IsSigned && msg.PGPDetails().IsEncrypted { height = 2 } rows = append(rows, ui.GridSpec{ui.SIZE_EXACT, ui.Const(height)}) } rows = append(rows, []ui.GridSpec{ {ui.SIZE_EXACT, ui.Const(1)}, {ui.SIZE_WEIGHT, ui.Const(1)}, }...) grid := ui.NewGrid().Rows(rows).Columns([]ui.GridSpec{ {ui.SIZE_WEIGHT, ui.Const(1)}, }) switcher := &PartSwitcher{} err := createSwitcher(acct, switcher, conf, msg) if err != nil { return &MessageViewer{ err: err, grid: grid, msg: msg, uiConfig: acct.UiConfig(), } } borderStyle := acct.UiConfig().GetStyle(config.STYLE_BORDER) borderChar := acct.UiConfig().BorderCharHorizontal grid.AddChild(header).At(0, 0) if msg.PGPDetails() != nil { grid.AddChild(NewPGPInfo(msg.PGPDetails(), acct.UiConfig())).At(1, 0) grid.AddChild(ui.NewFill(borderChar, borderStyle)).At(2, 0) grid.AddChild(switcher).At(3, 0) } else { grid.AddChild(ui.NewFill(borderChar, borderStyle)).At(1, 0) grid.AddChild(switcher).At(2, 0) } mv := &MessageViewer{ acct: acct, conf: conf, grid: grid, msg: msg, switcher: switcher, uiConfig: acct.UiConfig(), } switcher.mv = mv return mv } func fmtHeader(msg *models.MessageInfo, header string, timefmt string) string { switch header { case "From": return format.FormatAddresses(msg.Envelope.From) case "To": return format.FormatAddresses(msg.Envelope.To) case "Cc": return format.FormatAddresses(msg.Envelope.Cc) case "Bcc": return format.FormatAddresses(msg.Envelope.Bcc) case "Date": return msg.Envelope.Date.Local().Format(timefmt) case "Subject": return msg.Envelope.Subject case "Labels": return strings.Join(msg.Labels, ", ") default: return msg.RFC822Headers.Get(header) } } func enumerateParts(acct *AccountView, conf *config.AercConfig, msg lib.MessageView, body *models.BodyStructure, index []int) ([]*PartViewer, error) { var parts []*PartViewer for i, part := range body.Parts { curindex := append(index, i+1) if part.MIMEType == "multipart" { // Multipart meta-parts are faked pv := &PartViewer{part: part} parts = append(parts, pv) subParts, err := enumerateParts( acct, conf, msg, part, curindex) if err != nil { return nil, err } parts = append(parts, subParts...) continue } pv, err := NewPartViewer(acct, conf, msg, part, curindex) if err != nil { return nil, err } parts = append(parts, pv) } return parts, nil } func createSwitcher(acct *AccountView, switcher *PartSwitcher, conf *config.AercConfig, msg lib.MessageView) error { var err error switcher.selected = -1 switcher.showHeaders = conf.Viewer.ShowHeaders switcher.alwaysShowMime = conf.Viewer.AlwaysShowMime if len(msg.BodyStructure().Parts) == 0 { switcher.selected = 0 pv, err := NewPartViewer(acct, conf, msg, msg.BodyStructure(), nil) if err != nil { return err } switcher.parts = []*PartViewer{pv} pv.OnInvalidate(func(_ ui.Drawable) { switcher.Invalidate() }) } else { switcher.parts, err = enumerateParts(acct, conf, msg, msg.BodyStructure(), []int{}) if err != nil { return err } selectedPriority := -1 fmt.Printf("Selecting best message from %v\n", conf.Viewer.Alternatives) for i, pv := range switcher.parts { pv.OnInvalidate(func(_ ui.Drawable) { switcher.Invalidate() }) // Switch to user's preferred mimetype if switcher.selected == -1 && pv.part.MIMEType != "multipart" { switcher.selected = i } mime := strings.ToLower(pv.part.MIMEType) + "/" + strings.ToLower(pv.part.MIMESubType) for idx, m := range conf.Viewer.Alternatives { if m != mime { continue } priority := len(conf.Viewer.Alternatives) - idx if priority > selectedPriority { selectedPriority = priority switcher.selected = i } } } } return nil } func (mv *MessageViewer) Draw(ctx *ui.Context) { if mv.err != nil { style := mv.acct.UiConfig().GetStyle(config.STYLE_DEFAULT) ctx.Fill(0, 0, ctx.Width(), ctx.Height(), ' ', style) ctx.Printf(0, 0, style, "%s", mv.err.Error()) return } mv.grid.Draw(ctx) } func (mv *MessageViewer) MouseEvent(localX int, localY int, event tcell.Event) { if mv.err != nil { return } mv.grid.MouseEvent(localX, localY, event) } func (mv *MessageViewer) Invalidate() { mv.grid.Invalidate() } func (mv *MessageViewer) OnInvalidate(fn func(d ui.Drawable)) { mv.grid.OnInvalidate(func(_ ui.Drawable) { fn(mv) }) } func (mv *MessageViewer) Store() *lib.MessageStore { return mv.msg.Store() } func (mv *MessageViewer) SelectedAccount() *AccountView { return mv.acct } func (mv *MessageViewer) SelectedMessage() (*models.MessageInfo, error) { if mv.msg == nil { return nil, errors.New("no message selected") } return mv.msg.MessageInfo(), nil } func (mv *MessageViewer) MarkedMessages() ([]uint32, error) { store := mv.Store() return store.Marked(), nil } func (mv *MessageViewer) ToggleHeaders() { switcher := mv.switcher mv.conf.Viewer.ShowHeaders = !mv.conf.Viewer.ShowHeaders err := createSwitcher(mv.acct, switcher, mv.conf, mv.msg) if err != nil { mv.acct.Logger().Printf( "warning: error during create switcher - %v", err) } switcher.Invalidate() } func (mv *MessageViewer) SelectedMessagePart() *PartInfo { switcher := mv.switcher part := switcher.parts[switcher.selected] return &PartInfo{ Index: part.index, Msg: part.msg.MessageInfo(), Part: part.part, } } func (mv *MessageViewer) PreviousPart() { switcher := mv.switcher for { switcher.selected-- if switcher.selected < 0 { switcher.selected = len(switcher.parts) - 1 } if switcher.parts[switcher.selected].part.MIMEType != "multipart" { break } } mv.Invalidate() } func (mv *MessageViewer) NextPart() { switcher := mv.switcher for { switcher.selected++ if switcher.selected >= len(switcher.parts) { switcher.selected = 0 } if switcher.parts[switcher.selected].part.MIMEType != "multipart" { break } } mv.Invalidate() } func (mv *MessageViewer) Close() error { mv.switcher.Cleanup() return nil } func (ps *PartSwitcher) Invalidate() { ps.DoInvalidate(ps) } func (ps *PartSwitcher) Focus(focus bool) { if ps.parts[ps.selected].term != nil { ps.parts[ps.selected].term.Focus(focus) } } func (ps *PartSwitcher) Event(event tcell.Event) bool { return ps.parts[ps.selected].Event(event) } func (ps *PartSwitcher) Draw(ctx *ui.Context) { height := len(ps.parts) if height == 1 && !ps.alwaysShowMime { ps.parts[ps.selected].Draw(ctx) return } // TODO: cap height and add scrolling for messages with many parts ps.height = ctx.Height() y := ctx.Height() - height for i, part := range ps.parts { style := ps.mv.uiConfig.GetStyle(config.STYLE_DEFAULT) if ps.selected == i { style = ps.mv.uiConfig.GetStyleSelected(config.STYLE_DEFAULT) } ctx.Fill(0, y+i, ctx.Width(), 1, ' ', style) name := fmt.Sprintf("%s/%s", strings.ToLower(part.part.MIMEType), strings.ToLower(part.part.MIMESubType)) if filename, ok := part.part.DispositionParams["filename"]; ok { name += fmt.Sprintf(" (%s)", filename) } else if filename, ok := part.part.Params["name"]; ok { // workaround golang not supporting RFC2231 besides ASCII and UTF8 name += fmt.Sprintf(" (%s)", filename) } ctx.Printf(len(part.index)*2, y+i, style, "%s", name) } ps.parts[ps.selected].Draw(ctx.Subcontext( 0, 0, ctx.Width(), ctx.Height()-height)) } func (ps *PartSwitcher) MouseEvent(localX int, localY int, event tcell.Event) { switch event := event.(type) { case *tcell.EventMouse: switch event.Buttons() { case tcell.Button1: height := len(ps.parts) y := ps.height - height if localY < y && ps.parts[ps.selected].term != nil { ps.parts[ps.selected].term.MouseEvent(localX, localY, event) } for i := range ps.parts { if localY != y+i { continue } if ps.parts[i].part.MIMEType == "multipart" { continue } if ps.parts[ps.selected].term != nil { ps.parts[ps.selected].term.Focus(false) } ps.selected = i ps.Invalidate() if ps.parts[ps.selected].term != nil { ps.parts[ps.selected].term.Focus(true) } } case tcell.WheelDown: height := len(ps.parts) y := ps.height - height if localY < y && ps.parts[ps.selected].term != nil { ps.parts[ps.selected].term.MouseEvent(localX, localY, event) } if ps.parts[ps.selected].term != nil { ps.parts[ps.selected].term.Focus(false) } ps.mv.NextPart() if ps.parts[ps.selected].term != nil { ps.parts[ps.selected].term.Focus(true) } case tcell.WheelUp: height := len(ps.parts) y := ps.height - height if localY < y && ps.parts[ps.selected].term != nil { ps.parts[ps.selected].term.MouseEvent(localX, localY, event) } if ps.parts[ps.selected].term != nil { ps.parts[ps.selected].term.Focus(false) } ps.mv.PreviousPart() if ps.parts[ps.selected].term != nil { ps.parts[ps.selected].term.Focus(true) } } } } func (ps *PartSwitcher) Cleanup() { for _, partViewer := range ps.parts { partViewer.Cleanup() } } func (mv *MessageViewer) Event(event tcell.Event) bool { return mv.switcher.Event(event) } func (mv *MessageViewer) Focus(focus bool) { mv.switcher.Focus(focus) } type PartViewer struct { ui.Invalidatable conf *config.AercConfig err error fetched bool filter *exec.Cmd index []int msg lib.MessageView pager *exec.Cmd pagerin io.WriteCloser part *models.BodyStructure showHeaders bool sink io.WriteCloser source io.Reader term *Terminal selector *Selector grid *ui.Grid uiConfig config.UIConfig } func NewPartViewer(acct *AccountView, conf *config.AercConfig, msg lib.MessageView, part *models.BodyStructure, index []int) (*PartViewer, error) { var ( filter *exec.Cmd pager *exec.Cmd pipe io.WriteCloser pagerin io.WriteCloser term *Terminal ) cmd, err := shlex.Split(conf.Viewer.Pager) if err != nil { return nil, err } pager = exec.Command(cmd[0], cmd[1:]...) info := msg.MessageInfo() for _, f := range conf.Filters { mime := strings.ToLower(part.MIMEType) + "/" + strings.ToLower(part.MIMESubType) switch f.FilterType { case config.FILTER_MIMETYPE: if fnmatch.Match(f.Filter, mime, 0) { filter = exec.Command("sh", "-c", f.Command) } case config.FILTER_HEADER: var header string switch f.Header { case "subject": header = info.Envelope.Subject case "from": header = format.FormatAddresses(info.Envelope.From) case "to": header = format.FormatAddresses(info.Envelope.To) case "cc": header = format.FormatAddresses(info.Envelope.Cc) default: header = msg.MessageInfo().RFC822Headers.Get(f.Header) } if f.Regex.Match([]byte(header)) { filter = exec.Command("sh", "-c", f.Command) } } if filter != nil { break } } if filter != nil { if pipe, err = filter.StdinPipe(); err != nil { return nil, err } if pagerin, _ = pager.StdinPipe(); err != nil { return nil, err } if term, err = NewTerminal(pager); err != nil { return nil, err } } grid := ui.NewGrid().Rows([]ui.GridSpec{ {ui.SIZE_EXACT, ui.Const(3)}, // Message {ui.SIZE_EXACT, ui.Const(1)}, // Selector {ui.SIZE_WEIGHT, ui.Const(1)}, }).Columns([]ui.GridSpec{ {ui.SIZE_WEIGHT, ui.Const(1)}, }) selector := NewSelector([]string{"Save message", "Pipe to command"}, 0, acct.UiConfig()). OnChoose(func(option string) { switch option { case "Save message": acct.aerc.BeginExCommand("save ") case "Pipe to command": acct.aerc.BeginExCommand("pipe ") } }) grid.AddChild(selector).At(2, 0) pv := &PartViewer{ conf: conf, filter: filter, index: index, msg: msg, pager: pager, pagerin: pagerin, part: part, showHeaders: conf.Viewer.ShowHeaders, sink: pipe, term: term, selector: selector, grid: grid, uiConfig: acct.UiConfig(), } if term != nil { term.OnStart = func() { pv.attemptCopy() } term.OnInvalidate(func(_ ui.Drawable) { pv.Invalidate() }) } return pv, nil } func (pv *PartViewer) SetSource(reader io.Reader) { pv.source = reader pv.attemptCopy() } func (pv *PartViewer) attemptCopy() { if pv.source == nil || pv.pager == nil || pv.pager.Process == nil { return } if pv.filter != nil { pv.copyFilterOutToPager() //delayed until we write to the sink } go func() { pv.writeMailHeaders() if strings.EqualFold(pv.part.MIMEType, "text") { // if the content is plain we can strip ansi control chars pv.copySourceToSinkStripAnsi() } else { // if it's binary we have to rely on the filter to be sane io.Copy(pv.sink, pv.source) } pv.sink.Close() }() } func (pv *PartViewer) writeMailHeaders() { info := pv.msg.MessageInfo() if pv.showHeaders && info.RFC822Headers != nil { // header need to bypass the filter, else we run into issues // with the filter messing with newlines etc. // hence all writes in this block go directly to the pager fields := info.RFC822Headers.Fields() for fields.Next() { var value string var err error if value, err = fields.Text(); err != nil { // better than nothing, use the non decoded version value = fields.Value() } field := fmt.Sprintf( "%s: %s\n", fields.Key(), value) pv.pagerin.Write([]byte(field)) } // virtual header if len(info.Labels) != 0 { labels := fmtHeader(info, "Labels", "") pv.pagerin.Write([]byte(fmt.Sprintf("Labels: %s\n", labels))) } pv.pagerin.Write([]byte{'\n'}) } } func (pv *PartViewer) copyFilterOutToPager() { stdout, _ := pv.filter.StdoutPipe() stderr, _ := pv.filter.StderrPipe() pv.filter.Start() ch := make(chan interface{}) go func() { _, err := io.Copy(pv.pagerin, stdout) if err != nil { pv.err = err pv.Invalidate() } stdout.Close() ch <- nil }() go func() { _, err := io.Copy(pv.pagerin, stderr) if err != nil { pv.err = err pv.Invalidate() } stderr.Close() ch <- nil }() go func() { <-ch <-ch pv.filter.Wait() pv.pagerin.Close() }() } func (pv *PartViewer) copySourceToSinkStripAnsi() { scanner := bufio.NewScanner(pv.source) // some people send around huge html without any newline in between // this did overflow the default 64KB buffer of bufio.Scanner. // If something can't fit in a GB there's no hope left scanner.Buffer(nil, 1024*1024*1024) for scanner.Scan() { text := scanner.Text() text = ansi.ReplaceAllString(text, "") io.WriteString(pv.sink, text+"\n") } if err := scanner.Err(); err != nil { fmt.Fprintf(os.Stderr, "failed to read line: %v\n", err) } } func (pv *PartViewer) Invalidate() { pv.DoInvalidate(pv) } func (pv *PartViewer) Draw(ctx *ui.Context) { style := pv.uiConfig.GetStyle(config.STYLE_DEFAULT) styleError := pv.uiConfig.GetStyle(config.STYLE_ERROR) if pv.filter == nil { // TODO: Let them download it directly or something ctx.Fill(0, 0, ctx.Width(), ctx.Height(), ' ', style) ctx.Printf(0, 0, styleError, "No filter configured for this mimetype ('%s/%s')", pv.part.MIMEType, pv.part.MIMESubType, ) ctx.Printf(0, 2, style, "You can still :save the message or :pipe it to an external command") pv.selector.Focus(true) pv.grid.Draw(ctx) return } if !pv.fetched { pv.msg.FetchBodyPart(pv.index, pv.SetSource) pv.fetched = true } if pv.err != nil { ctx.Fill(0, 0, ctx.Width(), ctx.Height(), ' ', style) ctx.Printf(0, 0, style, "%s", pv.err.Error()) return } pv.term.Draw(ctx) } func (pv *PartViewer) Cleanup() { if pv.pager != nil && pv.pager.Process != nil { pv.pager.Process.Kill() pv.pager = nil } } func (pv *PartViewer) Event(event tcell.Event) bool { if pv.term != nil { return pv.term.Event(event) } return pv.selector.Event(event) } type HeaderView struct { ui.Invalidatable conf *config.AercConfig Name string Value string uiConfig config.UIConfig } func (hv *HeaderView) Draw(ctx *ui.Context) { name := hv.Name size := runewidth.StringWidth(name + ":") lim := ctx.Width() - size - 1 value := runewidth.Truncate(" "+hv.Value, lim, "…") vstyle := hv.uiConfig.GetStyle(config.STYLE_DEFAULT) hstyle := hv.uiConfig.GetStyle(config.STYLE_HEADER) // TODO: Make this more robust and less dumb if hv.Name == "PGP" { vstyle = hv.uiConfig.GetStyle(config.STYLE_SUCCESS) } ctx.Fill(0, 0, ctx.Width(), ctx.Height(), ' ', vstyle) ctx.Printf(0, 0, hstyle, "%s:", name) ctx.Printf(size, 0, vstyle, "%s", value) } func (hv *HeaderView) Invalidate() { hv.DoInvalidate(hv) }