Send message to Telegram

2 files changed, 60 insertions, 0 deletions

diff --git a/flatbot.go b/flatbot.go
index 3cb052f..fc565f7 100644
--- a/flatbot.go
+++ b/flatbot.go
@@ -5,6 +5,7 @@ import (
 	"io"
 	"log"
 	"net/http"
+	"os"
 )
 
 func main() {
@@ -22,6 +23,18 @@ func main() {
 		log.Fatal(err)
 	}
 	flats = removeAlreadySent(flats, sent)
+	m := messenger{
+		Token:  os.Getenv("FLATBOT_TELEGRAM_BOT_API_TOKEN"),
+		ChatID: os.Getenv("FLATBOT_TELEGRAM_CHANNEL_ID"),
+	}
+	for _, f := range flats {
+		err = m.Send(f)
+		if err != nil {
+			// TODO: what to do with it?
+			log.Print(err)
+		}
+		sent = append(sent, f)
+	}
 	fmt.Println(flats)
 	writeSent(flats, "/tmp/sent.json")
 }
diff --git a/messenger.go b/messenger.go
new file mode 100644
index 0000000..127ebc2
--- /dev/null
+++ b/messenger.go
@@ -0,0 +1,47 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+)
+
+type messenger struct {
+	Token  string
+	ChatID string
+}
+
+func (m *messenger) Send(f flat) error {
+	text := fmt.Sprintf("%v\n%v", f.Price, f.URL())
+	data := url.Values{"chat_id": {m.ChatID}, "text": {text}}
+	resp, err := http.PostForm(m.makeURL(), data)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode != http.StatusOK {
+		body, err := io.ReadAll(resp.Body)
+		if err != nil {
+			return err
+		}
+		type errorResponse struct {
+			ErrorCode   int    `json:"error_code"`
+			Description string `json:"description"`
+		}
+		errorResp := errorResponse{}
+		if err := json.Unmarshal(body, &errorResp); err != nil {
+			return err
+		}
+		return fmt.Errorf("Error code: %v, description: %v",
+			errorResp.ErrorCode, errorResp.Description)
+	}
+	return nil
+}
+
+func (m *messenger) makeURL() string {
+	return fmt.Sprintf(
+		"https://api.telegram.org/bot%v/sendMessage",
+		m.Token)
+}