#4: + more detailed exceptions

src/main/java/org/sobotics/chatexchange/chat/ChatHost.java

@@ -12,10 +12,24 @@ public enum ChatHost {
 	META_STACK_EXCHANGE("meta.stackexchange.com");
 
 	private final String name, baseUrl;
+
+	/**
+	 * Host that is used for the login
+	 * 
+	 * This might be a different host, because stackexchange.com does not have a login
+	 */
+	private final String loginHost;
 
 	private ChatHost(String name) {
 		this.name = name;
 		this.baseUrl = "https://chat." + name;
+
+		if (this.name.equalsIgnoreCase("stackexchange.com")) {
+			//stackexchange.com doesn't have a login, so we have to use meta
+			this.loginHost = "meta.stackexchange.com";
+		} else {
+			this.loginHost = this.name;
+		}
 	}
 
 	/**
@@ -31,5 +45,12 @@ public String getName() {
 	public String getBaseUrl() {
 		return baseUrl;
 	}
+
+	/**
+	 * @return Host that is used for the login
+	 */
+	public String getLoginHost() {
+		return this.loginHost;
+	}
 
 }

src/main/java/org/sobotics/chatexchange/chat/ChatLoginException.java

@@ -0,0 +1,49 @@
+package org.sobotics.chatexchange.chat;
+
+/**
+ * Exception when the login fails. Contains information about the hosts
+ * 
+ * @author FelixSFD
+ */
+public class ChatLoginException extends Exception {
+	private static final long serialVersionUID = 3836431112726533617L;
+
+	/**
+	 * {@link ChatHost} that was used for the login
+	 */
+	private ChatHost host;
+
+	/**
+	 * Initializes the exception
+	 * @param chatHost {@link ChatHost} that was used for the login
+	 * @param message Error-message
+	 */
+	public ChatLoginException(ChatHost chatHost, String message) {
+		super(message);
+		this.host = chatHost;
+	}
+
+	/**
+	 * {@inheritDoc}
+	 */
+	@Override
+	public String getMessage() {
+		String msg = "Unable to login to " + this.host.getName();
+
+		if (!this.host.getName().equalsIgnoreCase(this.host.getLoginHost())) {
+			msg += " (via " + this.host.getLoginHost() + ")";
+		}
+
+		msg += ": " + super.getMessage();
+
+		return msg;
+	}
+
+	/**
+	 * {@inheritDoc}
+	 */
+	@Override
+	public String getLocalizedMessage() {
+		return this.getMessage();
+	}
+}

src/main/java/org/sobotics/chatexchange/chat/StackExchangeClient.java

@@ -79,26 +79,25 @@ public StackExchangeClient(String email, String password) {
 	 * Logs in to s given site
 	 * @param email The user's e-mail-address
 	 * @param password The password
-	 * @param The host of the main site (NOT the chat.*! Use ChatHost.getName())
+	 * @param host {@link ChatHost} of the {@link Room}
+	 * @throws ChatLoginException if the login fails
 	 * */
-	private void seLogin(String email, String password, String host) throws IOException {
-		String originalHost = host;
+	private void seLogin(String email, String password, ChatHost host) throws IOException, ChatLoginException {
+		String originalHost = host.getName();
+		String loginHost = host.getLoginHost();
 
-		if (host.equalsIgnoreCase(ChatHost.STACK_EXCHANGE.getName())) {
-			host = ChatHost.META_STACK_EXCHANGE.getName();
-		}
 
 		//The login-form has a hidden field called "fkey" which needs to be sent along with the mail and password
-		Response response = httpClient.get("https://"+host+"/users/login", cookies);
+		Response response = httpClient.get("https://"+loginHost+"/users/login", cookies);
 		String fkey = response.parse().select("input[name='fkey']").val();
 
-		response = httpClient.post("https://"+host+"/users/login", cookies, "email", email, "password", password, "fkey", fkey);
+		response = httpClient.post("https://"+loginHost+"/users/login", cookies, "email", email, "password", password, "fkey", fkey);
 
 		//Create account on that site if necessary
 		Element formElement = response.parse().getElementById("logout-user");
 		if (formElement != null) {
 			if (!this.autoCreateAccount) {
-				throw new IllegalStateException("Unable to login to Stack Exchange. The user does not have an account on " + originalHost);
+				throw new ChatLoginException(host, "The user does not have an account on this site!");
 			} // if autoCreate
 
 			Elements formInputs = formElement.getElementsByTag("input");
@@ -117,21 +116,27 @@ private void seLogin(String email, String password, String host) throws IOExcept
 
 			String[] formDataArray = formData.toArray(new String[formData.size()]);
 
-			String formUrl = "https://" + host + formElement.attr("action");
+			String formUrl = "https://" + loginHost + formElement.attr("action");
 
 			Response formResponse = httpClient.post(formUrl, cookies, formDataArray);
 			if (formResponse.parse().getElementsByClass("js-inbox-button").first() == null) {
 				LOGGER.debug(formResponse.parse().html());
-				throw new IllegalStateException("Unable to create account on " + host + "! Please create the account manually.");
+				throw new ChatLoginException(host, "Unable to create account! Please create the account manually.");
 			} // if
 		} // if
 
 
+		//Check for captcha
+		Element captchaElement = response.parse().getElementById("nocaptcha-form");
+		if (captchaElement != null) {
+			throw new ChatLoginException(host, "Captcha found! Please wait some time before trying to login again.");
+		}
+
 		// check if login succeeded
 		Response checkResponse = httpClient.get("https://"+originalHost+"/users/current", cookies);
 		if (checkResponse.parse().getElementsByClass("js-inbox-button").first() == null) {
 			LOGGER.debug(checkResponse.parse().html());
-			throw new IllegalStateException("Unable to login to Stack Exchange. (Site: " + originalHost + " via " + host + ")");
+			throw new ChatLoginException(host, "Maybe your login credentials are wrong.");
 		} // if
 	} // seLogin
 
@@ -163,10 +168,9 @@ private void SEOpenIdLogin(String email, String password) throws IOException {
 	 * @param host Host of the chat room to join.
 	 * @param roomId Id of the room to join.
 	 * @return <code>Room</code> joined.
+	 * @throws ChatLoginException when the login failed
 	 */
-	public Room joinRoom(ChatHost host, int roomId) {
-		String mainSiteHost = host.getName();
-
+	public Room joinRoom(ChatHost host, int roomId) throws ChatLoginException {
 		boolean alreadyLoggedIn = false;
 
 		for (Room room : this.rooms) {
@@ -179,10 +183,10 @@ public Room joinRoom(ChatHost host, int roomId) {
 		if (!alreadyLoggedIn) {
 			//not logged in on that site yet
 			try {
-				this.seLogin(email, password, mainSiteHost);
+				this.seLogin(email, password, host);
 			} catch (IOException e) {
-				LOGGER.error("Unable to login on " + mainSiteHost + " for " + host.getBaseUrl(), e);
-				throw new ChatOperationException("Login to " + mainSiteHost + " failed!");
+				LOGGER.error("Login failed due to IOException!", e);
+				throw new ChatLoginException(host, "IOException: " + e.getMessage());
 			}
 		}