fluid-telegram/cmd/adapter/main.go

// Command adapter runs the R-1 Telegram publishing adapter for one channel.
//
// It owns rendering and delivery only: it has no MTProto session and no
// provisioning code path, so a compromised adapter cannot create, rename,
// delete or re-permission anything (docs/adapter-contract.md). Configuration
// comes from `provision adapter-config`, per that same doc's Configuration
// section.
package main

import (
	"fmt"
	"log"
	"net/http"
	"os"
	"strconv"
	"strings"

	"github.com/tegwick/fluid-telegram/internal/adapter"
)

func main() {
	if err := run(); err != nil {
		log.Fatal(err)
	}
}

func run() error {
	token := os.Getenv("TELEGRAM_BOT_TOKEN")
	if token == "" {
		return fmt.Errorf("TELEGRAM_BOT_TOKEN is not set; injected from OpenBao at start, see docs/adapter-contract.md")
	}
	chatIDStr := os.Getenv("TELEGRAM_CHANNEL_ID")
	if chatIDStr == "" {
		return fmt.Errorf("TELEGRAM_CHANNEL_ID is not set; run `provision adapter-config`")
	}
	chatID, err := strconv.ParseInt(chatIDStr, 10, 64)
	if err != nil {
		return fmt.Errorf("TELEGRAM_CHANNEL_ID %q is not an integer: %w", chatIDStr, err)
	}

	attachVisual := os.Getenv("ATTACH_VISUAL") == "true"
	controlURL := os.Getenv("FLUID_CONTROL_URL")
	hallBaseURL := os.Getenv("HALL_BASE_URL")

	addr := os.Getenv("ADAPTER_LISTEN_ADDR")
	if addr == "" {
		addr = ":8080"
	}

	cfg := adapter.Config{
		ChatID:       chatID,
		AttachVisual: attachVisual,
		HallBaseURL:  hallBaseURL,
	}
	// UPLOAD_VISUALS=true: fetch images from VISUAL_HOSTS (default the forge)
	// and upload them, optionally with FORGE_READ_TOKEN, so Telegram never needs
	// a public image URL (FT-WP-0001-T14).
	if os.Getenv("UPLOAD_VISUALS") == "true" {
		hosts := strings.Split(os.Getenv("VISUAL_HOSTS"), ",")
		if strings.TrimSpace(os.Getenv("VISUAL_HOSTS")) == "" {
			hosts = []string{"forgejo.coulomb.social"}
		}
		cfg.Visuals = adapter.NewVisualFetcher(hosts, os.Getenv("FORGE_READ_TOKEN"))
	}
	a := adapter.New(cfg, adapter.NewBotAPISender(token), adapter.NewMemStore(), adapter.NewHTTPTelemetry(controlURL))

	log.Printf("adapter listening on %s (chat_id=%d, attach_visual=%v, upload_visuals=%v)", addr, chatID, attachVisual, cfg.Visuals != nil)
	return http.ListenAndServe(addr, a.Handler())
}