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Telegram: add markdown (#103)

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* Add support for markdown (telegram)

Close #98

* Telegram: add more Markdown Render blacklist
This commit is contained in:
Tatsuyuki Ishi 2017-01-07 07:32:17 +09:00 committed by Wim
parent 38103d36b4
commit e3dda0e812
1 changed files with 63 additions and 3 deletions
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66
bridge/telegram/telegram.go
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@ -1,10 +1,14 @@
package btelegram
import (
"bytes"
"html"
"strconv"
"github.com/42wim/matterbridge/bridge/config"
log "github.com/Sirupsen/logrus"
"github.com/go-telegram-bot-api/telegram-bot-api"
"strconv"
"github.com/russross/blackfriday"
)
type Btelegram struct {
@ -51,13 +55,70 @@ func (b *Btelegram) JoinChannel(channel string) error {
return nil
}
type customHtml struct {
blackfriday.Renderer
}
func (options *customHtml) Paragraph(out *bytes.Buffer, text func() bool) {
marker := out.Len()
if !text() {
out.Truncate(marker)
return
}
out.WriteString("\n")
}
func (options *customHtml) BlockCode(out *bytes.Buffer, text []byte, lang string) {
out.WriteString("<pre>")
out.WriteString(html.EscapeString(string(text)))
out.WriteString("</pre>\n")
}
func (options *customHtml) Header(out *bytes.Buffer, text func() bool, level int, id string) {
options.Paragraph(out, text)
}
func (options *customHtml) HRule(out *bytes.Buffer) {
out.WriteByte('\n')
}
func (options *customHtml) BlockQuote(out *bytes.Buffer, text []byte) {
out.WriteString("> ")
out.Write(text)
out.WriteByte('\n')
}
func (options *customHtml) List(out *bytes.Buffer, text func() bool, flags int) {
options.Paragraph(out, text)
}
func (options *customHtml) ListItem(out *bytes.Buffer, text []byte, flags int) {
out.WriteString("- ")
out.Write(text)
out.WriteByte('\n')
}
func (b *Btelegram) Send(msg config.Message) error {
flog.Debugf("Receiving %#v", msg)
chatid, err := strconv.ParseInt(msg.Channel, 10, 64)
if err != nil {
return err
}
m := tgbotapi.NewMessage(chatid, msg.Username + msg.Text)
parsed := blackfriday.Markdown([]byte(msg.Text),
&customHtml{blackfriday.HtmlRenderer(blackfriday.HTML_USE_XHTML|blackfriday.HTML_SKIP_IMAGES, "", "")},
blackfriday.EXTENSION_NO_INTRA_EMPHASIS|
blackfriday.EXTENSION_FENCED_CODE|
blackfriday.EXTENSION_AUTOLINK|
blackfriday.EXTENSION_SPACE_HEADERS|
blackfriday.EXTENSION_HEADER_IDS|
blackfriday.EXTENSION_BACKSLASH_LINE_BREAK|
blackfriday.EXTENSION_DEFINITION_LISTS)
m := tgbotapi.NewMessage(chatid, msg.Username+string(parsed))
m.ParseMode = "HTML"
_, err = b.c.Send(m)
return err
}
@ -69,6 +130,5 @@ func (b *Btelegram) handleRecv(updates <-chan tgbotapi.Update) {
}
flog.Debugf("Sending message from %s on %s to gateway", update.Message.From.UserName, b.Account)
b.Remote <- config.Message{Username: update.Message.From.UserName, Text: update.Message.Text, Channel: strconv.FormatInt(update.Message.Chat.ID, 10), Account: b.Account}
}
}