mirror of
https://github.com/lukaszraczylo/go-telegram.git
synced 2026-06-05 22:43:59 +00:00
lukaszraczylo
ac7cae8fa7
A fully-generated, strongly-typed Go client for the Telegram Bot API. * 176 methods + 301 types generated from Bot API v10.0 * 1408 auto-generated tests (8 scenarios per method) * Typed unions throughout — no 'any' in the public surface * Pluggable HTTP transport and JSON codec (default goccy/go-json) * Built-in retry middleware honouring Telegram's retry_after * Generic dispatcher with filters and conversation handlers * Self-verifying codegen pipeline (regen → audit → emit → run tests) * 14 example bots covering common patterns
111 lines
2.8 KiB
Go
111 lines
2.8 KiB
Go
// Package main demonstrates file upload and download with go-telegram.
|
|
// Send any document or photo to the bot — it downloads, then re-uploads
|
|
// the file with a "received: <bytes>" caption.
|
|
//
|
|
// TELEGRAM_BOT_TOKEN=xxx go run ./examples/files
|
|
package main
|
|
|
|
import (
|
|
"bytes"
|
|
"context"
|
|
"fmt"
|
|
"io"
|
|
"log"
|
|
"os"
|
|
"os/signal"
|
|
"path/filepath"
|
|
"syscall"
|
|
|
|
"github.com/lukaszraczylo/go-telegram/api"
|
|
"github.com/lukaszraczylo/go-telegram/client"
|
|
"github.com/lukaszraczylo/go-telegram/dispatch"
|
|
"github.com/lukaszraczylo/go-telegram/transport"
|
|
)
|
|
|
|
func main() {
|
|
token := os.Getenv("TELEGRAM_BOT_TOKEN")
|
|
if token == "" {
|
|
log.Fatal("TELEGRAM_BOT_TOKEN required")
|
|
}
|
|
|
|
ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
|
|
defer stop()
|
|
|
|
bot := client.New(token,
|
|
client.WithHTTPClient(client.NewRetryDoer(client.NewDefaultHTTPDoer())),
|
|
)
|
|
|
|
router := dispatch.New(bot)
|
|
|
|
router.OnCommand("/start", func(c *dispatch.Context, m *api.Message) error {
|
|
_, err := api.SendMessage(c.Ctx, c.Bot, &api.SendMessageParams{
|
|
ChatID: api.ChatIDFromInt(m.Chat.ID),
|
|
Text: "Send me a document and I'll download then re-upload it.",
|
|
})
|
|
return err
|
|
})
|
|
|
|
// Document uploads land in Message.Document. Use middleware to handle them.
|
|
router.Use(func(next dispatch.Handler[*api.Update]) dispatch.Handler[*api.Update] {
|
|
return func(c *dispatch.Context, u *api.Update) error {
|
|
if u.Message != nil && u.Message.Document != nil {
|
|
return handleDocument(c, u.Message)
|
|
}
|
|
return next(c, u)
|
|
}
|
|
})
|
|
|
|
poller := transport.NewLongPoller(bot)
|
|
if err := router.Run(ctx, poller); err != nil && err != context.Canceled {
|
|
log.Printf("router exited: %v", err)
|
|
}
|
|
}
|
|
|
|
func handleDocument(c *dispatch.Context, m *api.Message) error {
|
|
doc := m.Document
|
|
fileSize := int64(0)
|
|
if doc.FileSize != nil {
|
|
fileSize = *doc.FileSize
|
|
}
|
|
log.Printf("received: %s (%d bytes)", doc.FileName, fileSize)
|
|
|
|
// Download.
|
|
rc, _, err := api.DownloadFile(c.Ctx, c.Bot, doc.FileID)
|
|
if err != nil {
|
|
return reply(c, m.Chat.ID, fmt.Sprintf("download failed: %v", err))
|
|
}
|
|
defer func() {
|
|
_ = rc.Close()
|
|
}()
|
|
body, err := io.ReadAll(rc)
|
|
if err != nil {
|
|
return reply(c, m.Chat.ID, fmt.Sprintf("read failed: %v", err))
|
|
}
|
|
|
|
// Re-upload.
|
|
name := filepath.Base(doc.FileName)
|
|
if name == "" || name == "." {
|
|
name = "file"
|
|
}
|
|
_, err = api.SendDocument(c.Ctx, c.Bot, &api.SendDocumentParams{
|
|
ChatID: api.ChatIDFromInt(m.Chat.ID),
|
|
Document: &api.InputFile{
|
|
Reader: bytes.NewReader(body),
|
|
Filename: name,
|
|
},
|
|
Caption: fmt.Sprintf("received: %d bytes", len(body)),
|
|
})
|
|
if err != nil {
|
|
return reply(c, m.Chat.ID, fmt.Sprintf("upload failed: %v", err))
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func reply(c *dispatch.Context, chatID int64, text string) error {
|
|
_, err := api.SendMessage(c.Ctx, c.Bot, &api.SendMessageParams{
|
|
ChatID: api.ChatIDFromInt(chatID),
|
|
Text: text,
|
|
})
|
|
return err
|
|
}
|