package widgets
import (
"bufio"
"bytes"
"fmt"
"io"
"io/ioutil"
"mime"
"net/http"
gomail "net/mail"
"os"
"os/exec"
"path/filepath"
"strings"
"time"
"github.com/emersion/go-message"
"github.com/emersion/go-message/mail"
"github.com/gdamore/tcell"
"github.com/mattn/go-runewidth"
"github.com/mitchellh/go-homedir"
"github.com/pkg/errors"
"git.sr.ht/~sircmpwn/aerc/config"
"git.sr.ht/~sircmpwn/aerc/lib/templates"
"git.sr.ht/~sircmpwn/aerc/lib/ui"
"git.sr.ht/~sircmpwn/aerc/worker/types"
)
type Composer struct {
editors map[string]*headerEditor
acct *config.AccountConfig
config *config.AercConfig
aerc *Aerc
defaults map[string]string
editor *Terminal
email *os.File
attachments []string
grid *ui.Grid
header *ui.Grid
review *reviewMessage
worker *types.Worker
layout HeaderLayout
focusable []ui.MouseableDrawableInteractive
focused int
onClose []func(ti *Composer)
width int
}
func NewComposer(aerc *Aerc, conf *config.AercConfig,
acct *config.AccountConfig, worker *types.Worker, template string,
defaults map[string]string) (*Composer, error) {
if defaults == nil {
defaults = make(map[string]string)
}
if from := defaults["From"]; from == "" {
defaults["From"] = acct.From
}
templateData := templates.ParseTemplateData(defaults)
layout, editors, focusable := buildComposeHeader(
conf.Compose.HeaderLayout, defaults)
email, err := ioutil.TempFile("", "aerc-compose-*.eml")
if err != nil {
// TODO: handle this better
return nil, err
}
c := &Composer{
aerc: aerc,
editors: editors,
acct: acct,
config: conf,
defaults: defaults,
email: email,
worker: worker,
layout: layout,
// You have to backtab to get to "From", since you usually don't edit it
focused: 1,
focusable: focusable,
}
c.AddSignature()
if err := c.AddTemplate(template, templateData); err != nil {
return nil, err
}
c.updateGrid()
c.ShowTerminal()
return c, nil
}
func buildComposeHeader(layout HeaderLayout, defaults map[string]string) (
newLayout HeaderLayout,
editors map[string]*headerEditor,
focusable []ui.MouseableDrawableInteractive,
) {
editors = make(map[string]*headerEditor)
focusable = make([]ui.MouseableDrawableInteractive, 0)
for _, row := range layout {
for _, h := range row {
e := newHeaderEditor(h, "")
editors[h] = e
switch h {
case "From":
// Prepend From to support backtab
focusable = append([]ui.MouseableDrawableInteractive{e}, focusable...)
default:
focusable = append(focusable, e)
}
}
}
// Add Cc/Bcc editors to layout if in defaults and not already visible
for _, h := range []string{"Cc", "Bcc"} {
if val, ok := defaults[h]; ok && val != "" {
if _, ok := editors[h]; !ok {
e := newHeaderEditor(h, "")
editors[h] = e
focusable = append(focusable, e)
layout = append(layout, []string{h})
}
}
}
// Set default values for all editors
for key := range editors {
if val, ok := defaults[key]; ok {
editors[key].input.Set(val)
delete(defaults, key)
}
}
return layout, editors, focusable
}
// Note: this does not reload the editor. You must call this before the first
// Draw() call.
func (c *Composer) SetContents(reader io.Reader) *Composer {
c.email.Seek(0, io.SeekStart)
io.Copy(c.email, reader)
c.email.Sync()
c.email.Seek(0, io.SeekStart)
return c
}
func (c *Composer) PrependContents(reader io.Reader) {
buf := bytes.NewBuffer(nil)
c.email.Seek(0, io.SeekStart)
io.Copy(buf, c.email)
c.email.Seek(0, io.SeekStart)
io.Copy(c.email, reader)
io.Copy(c.email, buf)
c.email.Sync()
}
func (c *Composer) AppendContents(reader io.Reader) {
c.email.Seek(0, io.SeekEnd)
io.Copy(c.email, reader)
c.email.Sync()
}
func (c *Composer) AddTemplate(template string, data interface{}) error {
if template == "" {
return nil
}
templateText, err := templates.ParseTemplateFromFile(
template, c.config.Templates.TemplateDirs, data)
if err != nil {
return err
}
return c.addTemplate(templateText)
}
func (c *Composer) AddTemplateFromString(template string, data interface{}) error {
if template == "" {
return nil
}
templateText, err := templates.ParseTemplate(template, data)
if err != nil {
return err
}
return c.addTemplate(templateText)
}
func (c *Composer) addTemplate(templateText []byte) error {
reader, err := mail.CreateReader(bytes.NewReader(templateText))
if err != nil {
// encountering an error when reading the template probably
// means the template didn't evaluate to a properly formatted
// mail file.
// This is fine, we still want to support simple body tempaltes
// that don't include headers.
//
// Just prepend the rendered template in that case. This
// basically equals the previous behavior.
c.PrependContents(bytes.NewReader(templateText))
return nil
}
defer reader.Close()
// populate header editors
header := reader.Header
mhdr := (*message.Header)(&header.Header)
for _, editor := range c.editors {
if mhdr.Has(editor.name) {
editor.input.Set(mhdr.Get(editor.name))
// remove header fields that have editors
mhdr.Del(editor.name)
}
}
part, err := reader.NextPart()
if err != nil {
return errors.Wrap(err, "reader.NextPart")
}
c.PrependContents(part.Body)
var (
headers string
fds = mhdr.Fields()
)
for fds.Next() {
headers += fmt.Sprintf("%s: %s\n", fds.Key(), fds.Value())
}
if headers != "" {
headers += "\n"
}
// prepend header fields without editors to message body
c.PrependContents(bytes.NewReader([]byte(headers)))
return nil
}
func (c *Composer) AddSignature() {
var signature []byte
if c.acct.SignatureCmd != "" {
var err error
signature, err = c.readSignatureFromCmd()
if err != nil {
signature = c.readSignatureFromFile()
}
} else {
signature = c.readSignatureFromFile()
}
c.AppendContents(bytes.NewReader(signature))
}
func (c *Composer) readSignatureFromCmd() ([]byte, error) {
sigCmd := c.acct.SignatureCmd
cmd := exec.Command("sh", "-c", sigCmd)
signature, err := cmd.Output()
if err != nil {
return nil, err
}
return signature, nil
}
func (c *Composer) readSignatureFromFile() []byte {
sigFile := c.acct.SignatureFile
if sigFile == "" {
return nil
}
sigFile, err := homedir.Expand(sigFile)
if err != nil {
return nil
}
signature, err := ioutil.ReadFile(sigFile)
if err != nil {
c.aerc.PushError(fmt.Sprintf(" Error loading signature from file: %v", sigFile))
return nil
}
return signature
}
func (c *Composer) FocusTerminal() *Composer {
if c.editor == nil {
return c
}
c.focusable[c.focused].Focus(false)
c.focused = len(c.editors)
c.focusable[c.focused].Focus(true)
return c
}
func (c *Composer) FocusSubject() *Composer {
c.focusable[c.focused].Focus(false)
c.focused = 2
c.focusable[c.focused].Focus(true)
return c
}
func (c *Composer) FocusRecipient() *Composer {
c.focusable[c.focused].Focus(false)
c.focused = 1
c.focusable[c.focused].Focus(true)
return c
}
// OnHeaderChange registers an OnChange callback for the specified header.
func (c *Composer) OnHeaderChange(header string, fn func(subject string)) {
if editor, ok := c.editors[header]; ok {
editor.OnChange(func() {
fn(editor.input.String())
})
}
}
func (c *Composer) OnClose(fn func(composer *Composer)) {
c.onClose = append(c.onClose, fn)
}
func (c *Composer) Draw(ctx *ui.Context) {
c.width = ctx.Width()
c.grid.Draw(ctx)
}
func (c *Composer) Invalidate() {
c.grid.Invalidate()
}
func (c *Composer) OnInvalidate(fn func(d ui.Drawable)) {
c.grid.OnInvalidate(func(_ ui.Drawable) {
fn(c)
})
}
func (c *Composer) Close() {
for _, onClose := range c.onClose {
onClose(c)
}
if c.email != nil {
path := c.email.Name()
c.email.Close()
os.Remove(path)
c.email = nil
}
if c.editor != nil {
c.editor.Destroy()
c.editor = nil
}
}
func (c *Composer) Bindings() string {
if c.editor == nil {
return "compose::review"
} else if c.editor == c.focusable[c.focused] {
return "compose::editor"
} else {
return "compose"
}
}
func (c *Composer) Event(event tcell.Event) bool {
if c.editor != nil {
return c.focusable[c.focused].Event(event)
}
return false
}
func (c *Composer) MouseEvent(localX int, localY int, event tcell.Event) {
c.grid.MouseEvent(localX, localY, event)
for _, e := range c.focusable {
he, ok := e.(*headerEditor)
if ok && he.focused {
c.FocusEditor(he)
}
}
}
func (c *Composer) Focus(focus bool) {
c.focusable[c.focused].Focus(focus)
}
func (c *Composer) Config() *config.AccountConfig {
return c.acct
}
func (c *Composer) Worker() *types.Worker {
return c.worker
}
func (c *Composer) PrepareHeader() (*mail.Header, []string, error) {
// Extract headers from the email, if present
if err := c.reloadEmail(); err != nil {
return nil, nil, err
}
var (
rcpts []string
header mail.Header
)
reader, err := mail.CreateReader(c.email)
if err == nil {
header = reader.Header
defer reader.Close()
} else {
c.email.Seek(0, io.SeekStart)
}
// Update headers
mhdr := (*message.Header)(&header.Header)
mhdr.SetText("Message-Id", mail.GenerateMessageID())
headerKeys := make([]string, 0, len(c.editors))
for key := range c.editors {
headerKeys = append(headerKeys, key)
}
// Ensure headers which require special processing are included.
for _, key := range []string{"To", "From", "Cc", "Bcc", "Subject", "Date"} {
if _, ok := c.editors[key]; !ok {
headerKeys = append(headerKeys, key)
}
}
for _, h := range headerKeys {
val := ""
editor, ok := c.editors[h]
if ok {
val = editor.input.String()
} else {
val, _ = mhdr.Text(h)
}
switch h {
case "Subject":
if subject, _ := header.Subject(); subject == "" {
header.SetSubject(val)
}
case "Date":
if date, err := header.Date(); err != nil || date == (time.Time{}) {
header.SetDate(time.Now())
}
case "From", "To", "Cc", "Bcc": // Address headers
if val != "" {
hdrRcpts, err := gomail.ParseAddressList(val)
if err != nil {
return nil, nil, errors.Wrapf(err, "ParseAddressList(%s)", val)
}
edRcpts := make([]*mail.Address, len(hdrRcpts))
for i, addr := range hdrRcpts {
edRcpts[i] = (*mail.Address)(addr)
}
header.SetAddressList(h, edRcpts)
if h != "From" {
for _, addr := range edRcpts {
rcpts = append(rcpts, addr.Address)
}
}
}
default:
// Handle user configured header editors.
if ok && !mhdr.Header.Has(h) {
if val := editor.input.String(); val != "" {
mhdr.SetText(h, val)
}
}
}
}
// Merge in additional headers
txthdr := mhdr.Header
for key, value := range c.defaults {
if !txthdr.Has(key) && value != "" {
mhdr.SetText(key, value)
}
}
return &header, rcpts, nil
}
func (c *Composer) WriteMessage(header *mail.Header, writer io.Writer) error {
if err := c.reloadEmail(); err != nil {
return err
}
var body io.Reader
reader, err := mail.CreateReader(c.email)
if err == nil {
// TODO: Do we want to let users write a full blown multipart email
// into the editor? If so this needs to change
part, err := reader.NextPart()
if err != nil {
return errors.Wrap(err, "reader.NextPart")
}
body = part.Body
defer reader.Close()
} else {
c.email.Seek(0, io.SeekStart)
body = c.email
}
if len(c.attachments) == 0 {
// don't create a multipart email if we only have text
return writeInlineBody(header, body, writer)
}
// otherwise create a multipart email,
// with a multipart/alternative part for the text
w, err := mail.CreateWriter(writer, *header)
if err != nil {
return errors.Wrap(err, "CreateWriter")
}
defer w.Close()
if err := writeMultipartBody(body, w); err != nil {
return errors.Wrap(err, "writeMultipartBody")
}
for _, a := range c.attachments {
if err := writeAttachment(a, w); err != nil {
return errors.Wrap(err, "writeAttachment")
}
}
return nil
}
func writeInlineBody(header *mail.Header, body io.Reader, writer io.Writer) error {
header.SetContentType("text/plain", map[string]string{"charset": "UTF-8"})
w, err := mail.CreateSingleInlineWriter(writer, *header)
if err != nil {
return errors.Wrap(err, "CreateSingleInlineWriter")
}
defer w.Close()
if _, err := io.Copy(w, body); err != nil {
return errors.Wrap(err, "io.Copy")
}
return nil
}
// write the message body to the multipart message
func writeMultipartBody(body io.Reader, w *mail.Writer) error {
bh := mail.InlineHeader{}
bh.SetContentType("text/plain", map[string]string{"charset": "UTF-8"})
bi, err := w.CreateInline()
if err != nil {
return errors.Wrap(err, "CreateInline")
}
defer bi.Close()
bw, err := bi.CreatePart(bh)
if err != nil {
return errors.Wrap(err, "CreatePart")
}
defer bw.Close()
if _, err := io.Copy(bw, body); err != nil {
return errors.Wrap(err, "io.Copy")
}
return nil
}
// write the attachment specified by path to the message
func writeAttachment(path string, writer *mail.Writer) error {
filename := filepath.Base(path)
f, err := os.Open(path)
if err != nil {
return errors.Wrap(err, "os.Open")
}
defer f.Close()
reader := bufio.NewReader(f)
// determine the MIME type
// http.DetectContentType only cares about the first 512 bytes
head, err := reader.Peek(512)
if err != nil && err != io.EOF {
return errors.Wrap(err, "Peek")
}
mimeString := http.DetectContentType(head)
// mimeString can contain type and params (like text encoding),
// so we need to break them apart before passing them to the headers
mimeType, params, err := mime.ParseMediaType(mimeString)
if err != nil {
return errors.Wrap(err, "ParseMediaType")
}
params["name"] = filename
// set header fields
ah := mail.AttachmentHeader{}
ah.SetContentType(mimeType, params)
// setting the filename auto sets the content disposition
ah.SetFilename(filename)
aw, err := writer.CreateAttachment(ah)
if err != nil {
return errors.Wrap(err, "CreateAttachment")
}
defer aw.Close()
if _, err := reader.WriteTo(aw); err != nil {
return errors.Wrap(err, "reader.WriteTo")
}
return nil
}
func (c *Composer) GetAttachments() []string {
return c.attachments
}
func (c *Composer) AddAttachment(path string) {
c.attachments = append(c.attachments, path)
c.resetReview()
}
func (c *Composer) DeleteAttachment(path string) error {
for i, a := range c.attachments {
if a == path {
c.attachments = append(c.attachments[:i], c.attachments[i+1:]...)
c.resetReview()
return nil
}
}
return errors.New("attachment does not exist")
}
func (c *Composer) resetReview() {
if c.review != nil {
c.grid.RemoveChild(c.review)
c.review = newReviewMessage(c, nil)
c.grid.AddChild(c.review).At(1, 0)
}
}
func (c *Composer) termEvent(event tcell.Event) bool {
switch event := event.(type) {
case *tcell.EventMouse:
switch event.Buttons() {
case tcell.Button1:
c.FocusTerminal()
return true
}
}
return false
}
func (c *Composer) termClosed(err error) {
c.grid.RemoveChild(c.editor)
c.review = newReviewMessage(c, err)
c.grid.AddChild(c.review).At(1, 0)
c.editor.Destroy()
c.editor = nil
c.focusable = c.focusable[:len(c.focusable)-1]
if c.focused >= len(c.focusable) {
c.focused = len(c.focusable) - 1
}
}
func (c *Composer) ShowTerminal() {
if c.editor != nil {
return
}
if c.review != nil {
c.grid.RemoveChild(c.review)
}
editorName := c.config.Compose.Editor
if editorName == "" {
editorName = os.Getenv("EDITOR")
}
if editorName == "" {
editorName = "vi"
}
editor := exec.Command("/bin/sh", "-c", editorName+" "+c.email.Name())
c.editor, _ = NewTerminal(editor) // TODO: handle error
c.editor.OnEvent = c.termEvent
c.editor.OnClose = c.termClosed
c.grid.AddChild(c.editor).At(1, 0)
c.focusable = append(c.focusable, c.editor)
}
func (c *Composer) PrevField() {
c.focusable[c.focused].Focus(false)
c.focused--
if c.focused == -1 {
c.focused = len(c.focusable) - 1
}
c.focusable[c.focused].Focus(true)
}
func (c *Composer) NextField() {
c.focusable[c.focused].Focus(false)
c.focused = (c.focused + 1) % len(c.focusable)
c.focusable[c.focused].Focus(true)
}
func (c *Composer) FocusEditor(editor *headerEditor) {
c.focusable[c.focused].Focus(false)
for i, e := range c.focusable {
if e == editor {
c.focused = i
break
}
}
c.focusable[c.focused].Focus(true)
}
// AddEditor appends a new header editor to the compose window.
func (c *Composer) AddEditor(header string, value string, appendHeader bool) {
if _, ok := c.editors[header]; ok {
if appendHeader {
header := c.editors[header].input.String()
value = strings.TrimSpace(header) + ", " + value
}
c.editors[header].input.Set(value)
if value == "" {
c.FocusEditor(c.editors[header])
}
return
}
e := newHeaderEditor(header, value)
c.editors[header] = e
c.layout = append(c.layout, []string{header})
// Insert focus of new editor before terminal editor
c.focusable = append(
c.focusable[:len(c.focusable)-1],
e,
c.focusable[len(c.focusable)-1],
)
c.updateGrid()
if value == "" {
c.FocusEditor(c.editors[header])
}
}
// updateGrid should be called when the underlying header layout is changed.
func (c *Composer) updateGrid() {
header, height := c.layout.grid(
func(h string) ui.Drawable { return c.editors[h] },
)
if c.grid == nil {
c.grid = ui.NewGrid().Columns([]ui.GridSpec{{ui.SIZE_WEIGHT, 1}})
}
c.grid.Rows([]ui.GridSpec{
{ui.SIZE_EXACT, height},
{ui.SIZE_WEIGHT, 1},
})
if c.header != nil {
c.grid.RemoveChild(c.header)
}
c.header = header
c.grid.AddChild(c.header).At(0, 0)
}
func (c *Composer) reloadEmail() error {
name := c.email.Name()
c.email.Close()
file, err := os.Open(name)
if err != nil {
return errors.Wrap(err, "ReloadEmail")
}
c.email = file
return nil
}
type headerEditor struct {
name string
focused bool
input *ui.TextInput
}
func newHeaderEditor(name string, value string) *headerEditor {
return &headerEditor{
input: ui.NewTextInput(value),
name: name,
}
}
func (he *headerEditor) Draw(ctx *ui.Context) {
name := he.name + " "
size := runewidth.StringWidth(name)
ctx.Fill(0, 0, size, ctx.Height(), ' ', tcell.StyleDefault)
ctx.Printf(0, 0, tcell.StyleDefault.Bold(true), "%s", name)
he.input.Draw(ctx.Subcontext(size, 0, ctx.Width()-size, 1))
}
func (he *headerEditor) MouseEvent(localX int, localY int, event tcell.Event) {
switch event := event.(type) {
case *tcell.EventMouse:
switch event.Buttons() {
case tcell.Button1:
he.focused = true
}
width := runewidth.StringWidth(he.name + " ")
if localX >= width {
he.input.MouseEvent(localX-width, localY, event)
}
}
}
func (he *headerEditor) Invalidate() {
he.input.Invalidate()
}
func (he *headerEditor) OnInvalidate(fn func(ui.Drawable)) {
he.input.OnInvalidate(func(_ ui.Drawable) {
fn(he)
})
}
func (he *headerEditor) Focus(focused bool) {
he.focused = focused
he.input.Focus(focused)
}
func (he *headerEditor) Event(event tcell.Event) bool {
return he.input.Event(event)
}
func (he *headerEditor) OnChange(fn func()) {
he.input.OnChange(func(_ *ui.TextInput) {
fn()
})
}
type reviewMessage struct {
composer *Composer
grid *ui.Grid
}
func newReviewMessage(composer *Composer, err error) *reviewMessage {
spec := []ui.GridSpec{{ui.SIZE_EXACT, 2}, {ui.SIZE_EXACT, 1}}
for i := 0; i < len(composer.attachments)-1; i++ {
spec = append(spec, ui.GridSpec{ui.SIZE_EXACT, 1})
}
// make the last element fill remaining space
spec = append(spec, ui.GridSpec{ui.SIZE_WEIGHT, 1})
grid := ui.NewGrid().Rows(spec).Columns([]ui.GridSpec{
{ui.SIZE_WEIGHT, 1},
})
if err != nil {
grid.AddChild(ui.NewText(err.Error()).
Color(tcell.ColorRed, tcell.ColorDefault))
grid.AddChild(ui.NewText("Press [q] to close this tab.")).At(1, 0)
} else {
// TODO: source this from actual keybindings?
grid.AddChild(ui.NewText(
"Send this email? [y]es/[n]o/[e]dit/[a]ttach")).At(0, 0)
grid.AddChild(ui.NewText("Attachments:").
Reverse(true)).At(1, 0)
if len(composer.attachments) == 0 {
grid.AddChild(ui.NewText("(none)")).At(2, 0)
} else {
for i, a := range composer.attachments {
grid.AddChild(ui.NewText(a)).At(i+2, 0)
}
}
}
return &reviewMessage{
composer: composer,
grid: grid,
}
}
func (rm *reviewMessage) Invalidate() {
rm.grid.Invalidate()
}
func (rm *reviewMessage) OnInvalidate(fn func(ui.Drawable)) {
rm.grid.OnInvalidate(func(_ ui.Drawable) {
fn(rm)
})
}
func (rm *reviewMessage) Draw(ctx *ui.Context) {
rm.grid.Draw(ctx)
}