Sergiusz Bazanski | a885488 | 2020-01-05 00:34:38 +0100 | [diff] [blame^] | 1 | package main |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "fmt" |
| 6 | "strings" |
| 7 | "time" |
| 8 | |
| 9 | tgbotapi "github.com/go-telegram-bot-api/telegram-bot-api" |
| 10 | "github.com/golang/glog" |
| 11 | ) |
| 12 | |
| 13 | // telegramConnection runs a long-lived connection to the Telegram API to receive |
| 14 | // updates and pipe resulting messages into telLog. |
| 15 | func (s *server) telegramConnection(ctx context.Context) error { |
| 16 | u := tgbotapi.NewUpdate(0) |
| 17 | // TODO(q3k): figure out what the _fuck_ does this even mean |
| 18 | u.Timeout = 60 |
| 19 | |
| 20 | updates, err := s.tel.GetUpdatesChan(u) |
| 21 | if err != nil { |
| 22 | return fmt.Errorf("GetUpdatesChan(%+v): %v", u, err) |
| 23 | } |
| 24 | |
| 25 | for { |
| 26 | select { |
| 27 | case <-ctx.Done(): |
| 28 | return ctx.Err() |
| 29 | case u, ok := <-updates: |
| 30 | if !ok { |
| 31 | return fmt.Errorf("Updates channel closed") |
| 32 | } |
| 33 | |
| 34 | // Dispatch update. |
| 35 | switch { |
| 36 | case u.Message != nil: |
| 37 | if u.Message.Chat.ID != s.groupId { |
| 38 | glog.Infof("[ignored group %d] <%s> %v", u.Message.Chat.ID, u.Message.From, u.Message.Text) |
| 39 | continue |
| 40 | } |
| 41 | if msg := plainFromTelegram(s.tel.Self.ID, &u); msg != nil { |
| 42 | s.telLog <- msg |
| 43 | } |
| 44 | } |
| 45 | } |
| 46 | } |
| 47 | } |
| 48 | |
| 49 | // telegramLoop maintains a telegramConnection. |
| 50 | func (s *server) telegramLoop(ctx context.Context) { |
| 51 | for { |
| 52 | err := s.telegramConnection(ctx) |
| 53 | if err == ctx.Err() { |
| 54 | glog.Infof("Telegram connection closing: %v", err) |
| 55 | return |
| 56 | } |
| 57 | |
| 58 | glog.Errorf("Telegram connection error: %v", err) |
| 59 | select { |
| 60 | case <-ctx.Done(): |
| 61 | return |
| 62 | case <-time.After(1 * time.Second): |
| 63 | continue |
| 64 | } |
| 65 | } |
| 66 | } |
| 67 | |
| 68 | // plainFromTelegram turns a Telegram message into a plain text message. |
| 69 | func plainFromTelegram(selfID int, u *tgbotapi.Update) *telegramPlain { |
| 70 | parts := []string{} |
| 71 | |
| 72 | from := u.Message.From |
| 73 | replyto := u.Message.ReplyToMessage |
| 74 | text := u.Message.Text |
| 75 | |
| 76 | // This message is in reply to someone. |
| 77 | if replyto != nil && text != "" && replyto.From != nil { |
| 78 | // The rendered name of the author of the quote. |
| 79 | ruid := "@" + replyto.From.String() |
| 80 | |
| 81 | // First line of the quoted text. |
| 82 | quotedLine := "" |
| 83 | |
| 84 | // Check if the quoted message is from our bridge. |
| 85 | if replyto.From.ID == selfID { |
| 86 | // Someone replied to an IRC bridge message, extract nick and line from there |
| 87 | // eg: "<q3k> foo bar baz" -> ruid = q3k; quotedLine = foo bar baz |
| 88 | t := replyto.Text |
| 89 | if strings.HasPrefix(t, "<") { |
| 90 | p := strings.SplitN(t[1:], ">", 2) |
| 91 | nick := p[0] |
| 92 | quoted := strings.TrimSpace(p[1]) |
| 93 | |
| 94 | // ensure nick looks sane |
| 95 | if len(nick) < 16 && len(strings.Fields(nick)) == 1 { |
| 96 | quotedLine = strings.TrimSpace(strings.Split(quoted, "\n")[0]) |
| 97 | ruid = nick |
| 98 | } |
| 99 | } |
| 100 | } else { |
| 101 | // Someone replied to a native telegram message. |
| 102 | quoted := strings.TrimSpace(replyto.Text) |
| 103 | quotedLine = strings.TrimSpace(strings.Split(quoted, "\n")[0]) |
| 104 | } |
| 105 | |
| 106 | // If we have a line, quote it. Otherwise just refer to the nick without a quote. |
| 107 | if quotedLine != "" { |
| 108 | parts = append(parts, fmt.Sprintf("%s: >%s\n", ruid, quotedLine)) |
| 109 | } else { |
| 110 | parts = append(parts, fmt.Sprintf("%s: ", ruid)) |
| 111 | } |
| 112 | } |
| 113 | |
| 114 | // This message contains a sticker. |
| 115 | if u.Message.Sticker != nil { |
| 116 | emoji := "" |
| 117 | if u.Message.Sticker.SetName != "" { |
| 118 | emoji += "/" + u.Message.Sticker.SetName |
| 119 | } |
| 120 | if u.Message.Sticker.Emoji != "" { |
| 121 | emoji += "/" + u.Message.Sticker.Emoji |
| 122 | } |
| 123 | parts = append(parts, fmt.Sprintf("<sticker%s>", emoji)) |
| 124 | } |
| 125 | |
| 126 | // This message contains an animation. |
| 127 | if u.Message.Animation != nil { |
| 128 | a := u.Message.Animation |
| 129 | parts = append(parts, fmt.Sprintf("<uploaded animation: %s >\n", fileURL(a.FileID, "mp4"))) |
| 130 | } |
| 131 | |
| 132 | // This message contains a document. |
| 133 | if u.Message.Document != nil { |
| 134 | d := u.Message.Document |
| 135 | fnp := strings.Split(d.FileName, ".") |
| 136 | ext := "bin" |
| 137 | if len(fnp) > 1 { |
| 138 | ext = fnp[len(fnp)-1] |
| 139 | } |
| 140 | parts = append(parts, fmt.Sprintf("<uploaded file: %s >\n", fileURL(d.FileID, ext))) |
| 141 | } |
| 142 | |
| 143 | // This message contains a photo. |
| 144 | if u.Message.Photo != nil { |
| 145 | // Multiple entries are for different file sizes, choose the highest quality one. |
| 146 | hq := (*u.Message.Photo)[0] |
| 147 | for _, p := range *u.Message.Photo { |
| 148 | if p.FileSize > hq.FileSize { |
| 149 | hq = p |
| 150 | } |
| 151 | } |
| 152 | parts = append(parts, fmt.Sprintf("<uploaded photo: %s >\n", fileURL(hq.FileID, "jpg"))) |
| 153 | } |
| 154 | |
| 155 | // This message has some plain text. |
| 156 | if text != "" { |
| 157 | parts = append(parts, text) |
| 158 | } |
| 159 | |
| 160 | // Was there anything that we extracted? |
| 161 | if len(parts) > 0 { |
| 162 | return &telegramPlain{from.String(), strings.Join(parts, " ")} |
| 163 | } |
| 164 | return nil |
| 165 | } |
| 166 | |
| 167 | func fileURL(fid, ext string) string { |
| 168 | return flagTeleimgRoot + fid + "." + ext |
| 169 | } |