Resolve bot username automatically

README.md

@@ -42,7 +42,6 @@ Note: FFmpeg binary might be installed with limited number of filters and codecs
 docker build --tag 'ffmpegbot' .
 docker run -d -t -i \
   -e BOT_TOKEN='...' \
-  -e BOT_USERNAME='...' \
   -e APP_ID='...' \
   -e APP_HASH='...' \
   -e SUPERUSERS='12345' \
@@ -53,7 +52,6 @@ docker run -d -t -i \
 #### Environment variables
 
  - `BOT_TOKEN` — Telegram bot token
- - `BOT_USERNAME` — Telegram bot username
  - `APP_ID` — Telegram API app_id (see https://core.telegram.org/api/obtaining_api_id)
  - `APP_HASH` — Telegram API app_hash
  - `SUPERUSERS` — Comma-separated list of superusers. Superuser can execute /run command

ffmpegbot.yaml.template

@@ -1,6 +1,5 @@
-# Telegram bot token and bot username
+# Telegram bot token
 botToken: 1234567890:AAAABBBBCCCCDDDDEEEEFF-GGGGHHHHIIII
-botUsername: yourbotname
 # Telegram API app_id / app_hash (see https://core.telegram.org/api/obtaining_api_id)
 appId: 12345
 appHash: abc123def456

src/main/java/com/annimon/ffmpegbot/BotConfig.java

@@ -1,12 +1,14 @@
 package com.annimon.ffmpegbot;
 
+import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.Set;
 import java.util.stream.Collectors;
 
+@JsonIgnoreProperties(ignoreUnknown = true)
 public record BotConfig(String appId, String appHash,
-                        String botToken, String botUsername,
+                        String botToken,
                         String downloaderScript,
                         String superUsers, String allowedUsers) {
 

src/main/java/com/annimon/ffmpegbot/Main.java

@@ -6,6 +6,10 @@ import com.annimon.tgbotsmodule.Runner;
 import com.annimon.tgbotsmodule.beans.Config;
 import com.annimon.tgbotsmodule.services.YamlConfigLoaderService;
 import org.jetbrains.annotations.NotNull;
+import org.telegram.telegrambots.client.okhttp.OkHttpTelegramClient;
+import org.telegram.telegrambots.meta.api.methods.GetMe;
+import org.telegram.telegrambots.meta.api.objects.User;
+import org.telegram.telegrambots.meta.exceptions.TelegramApiException;
 
 import java.util.List;
 
@@ -19,7 +23,13 @@ public class Main implements BotModule {
     public @NotNull BotHandler botHandler(@NotNull Config config) {
         final var configLoader = new YamlConfigLoaderService();
         final var configFile = configLoader.configFile("ffmpegbot", config.getProfile());
-        final var wordlyConfig = configLoader.loadFile(configFile, BotConfig.class);
-        return new MainBotHandler(wordlyConfig);
+        final var botConfig = configLoader.loadFile(configFile, BotConfig.class);
+        try {
+            final var telegramClient = new OkHttpTelegramClient(botConfig.botToken());
+            final User bot = telegramClient.execute(new GetMe());
+            return new MainBotHandler(botConfig, bot.getUserName());
+        } catch (TelegramApiException e) {
+            throw new IllegalStateException("Unable to get information about bot", e);
+        }
     }
 }

src/main/java/com/annimon/ffmpegbot/MainBotHandler.java

@@ -24,17 +24,17 @@ public class MainBotHandler extends BotHandler {
     private final CommandRegistry<For> commands;
     private final MediaProcessingBundle mediaProcessingBundle;
 
-    public MainBotHandler(BotConfig botConfig) {
+    public MainBotHandler(BotConfig botConfig, String botUserName) {
         super(BotModuleOptions.createDefault(botConfig.botToken()));
         permissions = new Permissions(botConfig.superUserIds(), botConfig.allowedUserIds());
-        commands = new CommandRegistry<>(botConfig.botUsername(), permissions);
+        commands = new CommandRegistry<>(botUserName, permissions);
         final var sessions = new Sessions();
         final var fallbackFileDownloader = new FallbackFileDownloader(
                 new TelegramFileDownloader(),
                 new TelegramClientFileDownloader(
                         botConfig.downloaderScript(),
                         botConfig.appId(), botConfig.appHash(),
-                        botConfig.botToken(), botConfig.botUsername())
+                        botConfig.botToken(), botUserName)
         );
         mediaProcessingBundle = new MediaProcessingBundle(sessions, fallbackFileDownloader);
         commands.registerBundle(mediaProcessingBundle);