Login to Discord, better Configuration errors handling.

config.example.ini

@@ -0,0 +1,7 @@
+[discord]
+; Change next value to true if the account is a bot, thus logins using a token.
+; Don't forget to uncomment token then
+isBot = false
+email = bot@example.com
+password = samplePassword
+; token = sampleToken

src/main/java/net/pingex/discordbot/Configuration.java

@@ -85,4 +85,15 @@ public final class Configuration
 				datastore.get(section).replace(key, value);
 		}
 	}
+
+	/**
+	 * Say if the key exists in the datastore
+	 * @param section Section of the datastore
+	 * @param key Key to research
+	 * @return `true` if the key exists, `false` otherwise
+	 */
+	public static boolean exists(String section, String key)
+	{
+		return (datastore.get(section, key) != null) ? true : false;
+	}
 }

src/main/java/net/pingex/discordbot/ConfigurationException.java

@@ -0,0 +1,34 @@
+package net.pingex.discordbot;
+
+/**
+ * Exception thrown when an issue involving Configuration occurs.
+ * @version 0.1-dev
+ * @author Raphael "Pingex" NAAS
+ */
+public class ConfigurationException extends Exception
+{
+	public ConfigurationException(String message)
+	{
+		super(message);
+	}
+
+	protected ConfigurationException(String message, Throwable cause, boolean enableSuppression, boolean writableStackTrace)
+	{
+		super(message, cause, enableSuppression, writableStackTrace);
+	}
+
+	public ConfigurationException(Throwable cause)
+	{
+		super(cause);
+	}
+
+	public ConfigurationException(String message, Throwable cause)
+	{
+		super(message, cause);
+	}
+
+	public ConfigurationException()
+	{
+		super();
+	}
+}

src/main/java/net/pingex/discordbot/DiscordBot.java

@@ -1,5 +1,11 @@
 package net.pingex.discordbot;
 
+import sx.blah.discord.api.ClientBuilder;
+import sx.blah.discord.api.Event;
+import sx.blah.discord.api.IDiscordClient;
+import sx.blah.discord.api.IListener;
+import sx.blah.discord.handle.impl.events.ReadyEvent;
+import sx.blah.discord.util.DiscordException;
 import java.io.IOException;
 import java.util.logging.Logger;
 
@@ -11,6 +17,20 @@ import java.util.logging.Logger;
 public class DiscordBot
 {
 	private static final Logger LOGGER = Logger.getLogger(DiscordBot.class.getName());
+	private IDiscordClient client;
+
+	public DiscordBot(IDiscordClient client)
+	{
+		this.client = client;
+		LOGGER.info("Successfully logged in !");
+
+		this.client.getDispatcher().registerListener((IListener<ReadyEvent>) event ->
+				LOGGER.info("Logged in as \"" + event.getClient().getOurUser().getName() + "#" + event.getClient().getOurUser().getDiscriminator() + "\" (#" + event.getClient().getOurUser().getID() + ")"));
+	}
+
+	// ====================================================
+	// Static functions: main, config loader, etc.
+	// ====================================================
 
 	/**
 	 * Entry point
@@ -19,11 +39,8 @@ public class DiscordBot
 	public static void main(String[] args)
 	{
 		LOGGER.info("Hello World, starting up");
-		loadConfigurationSubroutine();
-	}
 
-	private static void loadConfigurationSubroutine() // TODO: Configuration file passed via CLI
-	{
+		// LOAD CONFIGURATION
 		try
 		{
 			Configuration.loadConfiguration("config.ini");
@@ -32,5 +49,38 @@ public class DiscordBot
 			LOGGER.severe("Could not load Configuration, reason: " + e.getMessage());
 			System.exit(10);
 		}
+
+		LOGGER.info("Logging in to Discord");
+		try
+		{
+			loginToDiscord();
+		} catch (ConfigurationException e)
+		{
+			LOGGER.severe("There is a problem with the Configuration: " + e.getMessage());
+			System.exit(9);
+		} catch (DiscordException e)
+		{
+			LOGGER.severe(e.getMessage());
+			System.exit(2);
+		}
+	}
+
+	private static DiscordBot loginToDiscord() throws ConfigurationException, DiscordException
+	{
+		ClientBuilder builder = new ClientBuilder();
+		if(Configuration.getValue("discord", "isBot", boolean.class))
+		{
+			if(!Configuration.exists("discord", "token"))
+				throw new ConfigurationException("No login token defined");
+			builder.withToken(Configuration.getValue("discord", "token"));
+		}
+		else
+		{
+			if(!Configuration.exists("discord", "email") || !Configuration.exists("discord", "password"))
+				throw new ConfigurationException("Can't login: Either the email or the password wasn't provided.");
+			builder.withLogin(Configuration.getValue("discord", "email"), Configuration.getValue("discord", "password"));
+		}
+
+		return new DiscordBot(builder.login());
 	}
 }