56 lines
1.4 KiB
Go
56 lines
1.4 KiB
Go
package telegram
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import (
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"context"
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"fmt"
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"io"
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"net/http"
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"net/url"
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"strings"
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"time"
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)
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// Sender abstracts the actual Telegram Bot API call so the service layer
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// can be unit-tested without making real network requests.
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type Sender interface {
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Send(ctx context.Context, botToken, chatID, text string) error
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}
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type httpSender struct {
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client *http.Client
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}
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func NewHTTPSender() Sender {
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return &httpSender{client: &http.Client{Timeout: 10 * time.Second}}
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}
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func (s *httpSender) Send(ctx context.Context, botToken, chatID, text string) error {
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if botToken == "" || chatID == "" {
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return fmt.Errorf("telegram bot token and chat id must be configured")
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}
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endpoint := fmt.Sprintf("https://api.telegram.org/bot%s/sendMessage", botToken)
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form := url.Values{
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"chat_id": {chatID},
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"text": {text},
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}
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req, err := http.NewRequestWithContext(ctx, http.MethodPost, endpoint, strings.NewReader(form.Encode()))
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if err != nil {
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return fmt.Errorf("build telegram request: %w", err)
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}
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req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
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resp, err := s.client.Do(req)
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if err != nil {
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return fmt.Errorf("call telegram api: %w", err)
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}
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defer resp.Body.Close()
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if resp.StatusCode >= 300 {
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body, _ := io.ReadAll(io.LimitReader(resp.Body, 4096))
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return fmt.Errorf("telegram api returned status %d: %s", resp.StatusCode, string(body))
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}
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return nil
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}
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