add: vercel support

api/bot.go

@@ -0,0 +1,80 @@
+package api
+
+import (
+	"encoding/json"
+	"fmt"
+	"github.com/AshokShau/BotApiDocs/Telegram/modules"
+	"io"
+	"net/http"
+	"os"
+	"strings"
+
+	"github.com/PaulSonOfLars/gotgbot/v2"
+)
+
+var (
+	allowedTokens    = strings.Split(os.Getenv("TOKEN"), " ")
+	lenAllowedTokens = len(allowedTokens)
+)
+
+const (
+	statusCodeSuccess = 200
+)
+
+// Bot Handles all incoming traffic from webhooks.
+func Bot(w http.ResponseWriter, r *http.Request) {
+	url := r.URL.Path
+
+	split := strings.Split(url, "/")
+	if len(split) < 2 {
+		fmt.Println(w, "url path too short")
+		w.WriteHeader(statusCodeSuccess)
+
+		return
+	}
+
+	botToken := split[len(split)-2]
+
+	bot, _ := gotgbot.NewBot(botToken, &gotgbot.BotOpts{DisableTokenCheck: false})
+
+	if lenAllowedTokens > 0 && allowedTokens[0] != "" && !findInStringSlice(allowedTokens, botToken) {
+		_, _ = bot.DeleteWebhook(&gotgbot.DeleteWebhookOpts{DropPendingUpdates: true}) // It doesn't matter if it errors
+		w.WriteHeader(statusCodeSuccess)
+		return
+	}
+
+	var update gotgbot.Update
+
+	body, err := io.ReadAll(r.Body)
+	if err != nil {
+		_, _ = fmt.Fprintf(w, "Error reading request body: %v", err)
+		w.WriteHeader(statusCodeSuccess)
+		return
+	}
+
+	err = json.Unmarshal(body, &update)
+	if err != nil {
+		fmt.Println("failed to unmarshal body ", err)
+		w.WriteHeader(statusCodeSuccess)
+
+		return
+	}
+
+	bot.Username = split[len(split)-1]
+
+	err = modules.Dispatcher.ProcessUpdate(bot, &update, map[string]any{})
+	if err != nil {
+		fmt.Printf("error while processing update: %v", err)
+	}
+
+	w.WriteHeader(statusCodeSuccess)
+}
+
+func findInStringSlice(slice []string, val string) bool {
+	sliceMap := make(map[string]struct{}, len(slice))
+	for _, item := range slice {
+		sliceMap[item] = struct{}{}
+	}
+	_, exists := sliceMap[val]
+	return exists
+}

vercel.json

@@ -0,0 +1,22 @@
+{
+  "build": {
+    "env": {
+      "GO_BUILD_FLAGS": "-ldflags '-s -w'"
+    }
+  },
+  "routes": [
+    {
+      "src": "/bot/.*/.*",
+      "dest": "/api/bot.go"
+    },
+    {
+      "src": "/",
+      "dest": "/index.html"
+    }
+  ],
+  "functions": {
+    "api/bot.go": {
+      "maxDuration": 50
+    }
+  }
+}