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e3dda0e812
* Add support for markdown (telegram) Close #98 * Telegram: add more Markdown Render blacklist
135 lines
3.2 KiB
Go
135 lines
3.2 KiB
Go
package btelegram
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import (
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"bytes"
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"html"
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"strconv"
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"github.com/42wim/matterbridge/bridge/config"
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log "github.com/Sirupsen/logrus"
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"github.com/go-telegram-bot-api/telegram-bot-api"
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"github.com/russross/blackfriday"
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)
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type Btelegram struct {
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c *tgbotapi.BotAPI
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Config *config.Protocol
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Remote chan config.Message
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Account string
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}
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var flog *log.Entry
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var protocol = "telegram"
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func init() {
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flog = log.WithFields(log.Fields{"module": protocol})
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}
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func New(cfg config.Protocol, account string, c chan config.Message) *Btelegram {
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b := &Btelegram{}
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b.Config = &cfg
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b.Remote = c
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b.Account = account
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return b
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}
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func (b *Btelegram) Connect() error {
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var err error
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flog.Info("Connecting")
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b.c, err = tgbotapi.NewBotAPI(b.Config.Token)
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if err != nil {
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flog.Debugf("%#v", err)
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return err
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}
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updates, err := b.c.GetUpdatesChan(tgbotapi.NewUpdate(0))
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if err != nil {
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flog.Debugf("%#v", err)
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return err
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}
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flog.Info("Connection succeeded")
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go b.handleRecv(updates)
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return nil
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}
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func (b *Btelegram) JoinChannel(channel string) error {
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return nil
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}
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type customHtml struct {
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blackfriday.Renderer
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}
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func (options *customHtml) Paragraph(out *bytes.Buffer, text func() bool) {
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marker := out.Len()
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if !text() {
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out.Truncate(marker)
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return
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}
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out.WriteString("\n")
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}
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func (options *customHtml) BlockCode(out *bytes.Buffer, text []byte, lang string) {
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out.WriteString("<pre>")
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out.WriteString(html.EscapeString(string(text)))
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out.WriteString("</pre>\n")
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}
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func (options *customHtml) Header(out *bytes.Buffer, text func() bool, level int, id string) {
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options.Paragraph(out, text)
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}
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func (options *customHtml) HRule(out *bytes.Buffer) {
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out.WriteByte('\n')
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}
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func (options *customHtml) BlockQuote(out *bytes.Buffer, text []byte) {
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out.WriteString("> ")
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out.Write(text)
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out.WriteByte('\n')
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}
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func (options *customHtml) List(out *bytes.Buffer, text func() bool, flags int) {
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options.Paragraph(out, text)
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}
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func (options *customHtml) ListItem(out *bytes.Buffer, text []byte, flags int) {
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out.WriteString("- ")
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out.Write(text)
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out.WriteByte('\n')
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}
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func (b *Btelegram) Send(msg config.Message) error {
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flog.Debugf("Receiving %#v", msg)
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chatid, err := strconv.ParseInt(msg.Channel, 10, 64)
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if err != nil {
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return err
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}
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parsed := blackfriday.Markdown([]byte(msg.Text),
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&customHtml{blackfriday.HtmlRenderer(blackfriday.HTML_USE_XHTML|blackfriday.HTML_SKIP_IMAGES, "", "")},
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blackfriday.EXTENSION_NO_INTRA_EMPHASIS|
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blackfriday.EXTENSION_FENCED_CODE|
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blackfriday.EXTENSION_AUTOLINK|
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blackfriday.EXTENSION_SPACE_HEADERS|
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blackfriday.EXTENSION_HEADER_IDS|
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blackfriday.EXTENSION_BACKSLASH_LINE_BREAK|
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blackfriday.EXTENSION_DEFINITION_LISTS)
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m := tgbotapi.NewMessage(chatid, msg.Username+string(parsed))
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m.ParseMode = "HTML"
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_, err = b.c.Send(m)
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return err
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}
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func (b *Btelegram) handleRecv(updates <-chan tgbotapi.Update) {
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for update := range updates {
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if update.Message == nil {
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continue
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}
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flog.Debugf("Sending message from %s on %s to gateway", update.Message.From.UserName, b.Account)
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b.Remote <- config.Message{Username: update.Message.From.UserName, Text: update.Message.Text, Channel: strconv.FormatInt(update.Message.Chat.ID, 10), Account: b.Account}
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}
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}
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