add event listener

src/main/java/com/my/discordbot/BotInitializer.java

@@ -1,22 +1,22 @@
 package com.my.discordbot;
 
-import net.dv8tion.jda.api.JDABuilder;
-import org.springframework.beans.factory.annotation.Autowired;
-import org.springframework.beans.factory.annotation.Value;
-import org.springframework.stereotype.Component;
+        import net.dv8tion.jda.api.JDABuilder;
+        import org.springframework.beans.factory.annotation.Autowired;
+        import org.springframework.beans.factory.annotation.Value;
+        import org.springframework.stereotype.Component;
 
 @Component
 public class BotInitializer {
 
     @Autowired
-    private Bot bot;
+    private EventListener eventListener;
 
-    @Value("")
+    @Value("${DISCORD_BOT_TOKEN}")
     private String discordBotToken;
 
     public void initializeBot() {
         JDABuilder.createLight(discordBotToken)
-                .addEventListeners(bot)
+                .addEventListeners(eventListener)
                 .build();
     }
 

src/main/java/com/my/discordbot/DiscordBotApplication.java

@@ -1,12 +1,23 @@
 package com.my.discordbot;
 
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.CommandLineRunner;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 
 @SpringBootApplication
-public class DiscordBotApplication {
+public class DiscordBotApplication implements CommandLineRunner {
+
+    @Autowired
+    private BotInitializer botInitializer;
 
     public static void main(String[] args) {
         SpringApplication.run(DiscordBotApplication.class, args);
     }
+
+    @Override
+    public void run(String... args) throws Exception {
+        botInitializer.initializeBot();
+    }
+
 }

src/main/java/com/my/discordbot/EventListener.java

@@ -0,0 +1,36 @@
+package com.my.discordbot;
+
+import net.dv8tion.jda.api.entities.Message;
+import net.dv8tion.jda.api.entities.channel.concrete.TextChannel;
+import net.dv8tion.jda.api.entities.channel.middleman.MessageChannel;
+import net.dv8tion.jda.api.events.message.MessageReceivedEvent;
+import net.dv8tion.jda.api.hooks.ListenerAdapter;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.stereotype.Component;
+
+@Component
+public class EventListener extends ListenerAdapter {
+
+    @Autowired
+    private ProcessConversionToJpg processConversion;
+
+    @Override
+    public void onMessageReceived(MessageReceivedEvent event) {
+        Message message = event.getMessage();
+        MessageChannel channel = event.getChannel();
+
+        if (channel instanceof TextChannel) {
+            if (!message.getAuthor().isBot() && message.getAttachments().size() > 0) {
+                message.getAttachments().forEach(attachment -> {
+                    if (attachment.getFileName().endsWith(".heic")) {
+                        processConversion.process(attachment, channel);
+                    }
+                });
+            }
+        }
+    }
+
+}
+
+

src/main/java/com/my/discordbot/ProcessConversionToJpg.java

@@ -0,0 +1,22 @@
+package com.my.discordbot;
+
+import net.dv8tion.jda.api.entities.Message;
+import net.dv8tion.jda.api.entities.channel.middleman.MessageChannel;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.stereotype.Component;
+
+@Component
+public class ProcessConversionToJpg {
+
+    @Value("")
+    private String cloudFunctionUrl;
+
+    @Value("")
+    private String secretToken;
+
+    @Value("")
+    private String ownerId;
+
+    public void process(Message.Attachment attachment, MessageChannel channel) {}
+
+}

src/main/resources/application.properties

@@ -1,4 +1,5 @@
-# sensitive properties
+# sensitive properties, stored alternatively in .env
+
 # DISCORD_BOT_TOKEN=${DISCORD_BOT_TOKEN}
 # OWNER_ID=${OWNER_ID}
 # CLOUD_FUNCTION_URL=${CLOUD_FUNCTION_URL}