Protocol version 6: Compatibility future-proofing and some enhancements

README.md

@@ -72,11 +72,7 @@ Table          | Column Names                                              | Col
 
 To verify a new add-on (or an existing one after an update), read the code carefully and make sure it does not contain malicious code. Also check for potentially desync-prone code pieces. Then, in the Widelands add-on manager, select the add-on in the Browse tab, go to the Comments & Votes window, and use the admin interface to set the add-on’s security, sync-safety, and quality properties as appropriate.
 
-If the add-on was not up for translation on Transifex yet, a translations **maintainer** needs to follow these steps afterwards to ensure that it can be translated:
-- Enable Transifex integration for the add-on via the admin interface.
-- Head over to https://www.transifex.com/widelands/widelands-addons/content/ and wait until the new resource(s) is/are available.
-- Edit each new resource’s name to match with the add-on’s name by clicking on the resource and choosing ··· → Settings. Only change the display name – **never, ever** modify the resource’s slug!
-- Finally, set the Priority of all new resources. Add-ons officially provided by the Widelands Development Team get highest priority. Add-ons which have not been verified yet should not appear on Transifex in the first place, but if they do, they get the lowest priority. All other add-ons get medium priority. Also add appropriate category tags to the resources: Every resource gets the add-on’s category as a tag. The few official add-ons also get the "Official" tag and perhaps other tags as appropriate (e.g. "Tournament" for add-ons used in an official tournament).
+If the add-on was not up for translation on Transifex yet, additionally enable Transifex integration for the add-on via the admin interface. You will need to set the Display Name (which should match the add-on’s name) and the Priority of the new resource. Add-ons officially provided by the Widelands Development Team get highest priority. Add-ons which have not been verified yet should not appear on Transifex in the first place, but if they do, they get the lowest priority. All other add-ons get medium priority. Also add appropriate category tags to the resources: Every resource gets the add-on’s category as a tag. The few official add-ons also get the "Official" tag and perhaps other tags as appropriate (e.g. "Tournament" for add-ons used in an official tournament).
 
 ### Maintainer E-Mail Subscriptions
 

wl/server/ClientThread.java

@@ -38,7 +38,7 @@ public class ClientThread implements Runnable {
 
 	/** The newest protocol version the server supports. */
 	// May be increased but never decreased.
-	public static final int kNewestSupportedProtocolVersion = 5;
+	public static final int kNewestSupportedProtocolVersion = 6;
 
 	/**
 	 * Constructor.

wl/server/Command.java

@@ -25,7 +25,7 @@
  * <p>
  * After the first contact, the client must send the following info:
  * <ul>
- *  <li> Protocol version, <code>\n</code>
+ *  <li> Protocol version (PV), <code>\n</code>
  *  <li> Language name (e.g. "nds"), <code>\n</code>
  *  <li> {@literal Protocol version >= 5}: Widelands version (e.g. "1.1~git34567"), <code>\n</code>
  *  <li> Username (or "" for no user), <code>\n</code>
@@ -45,12 +45,20 @@
  * </ul></ul>
  *
  * <p>
- * The currently supported protocol versions are 4 to 5. All documentation here refers to these
+ * The currently supported protocol versions are 4 to 6. All documentation here refers to these
  * versions. Note that compatibility for <strong>all</strong> versions <strong>ever introduced</strong> needs to be maintained
  * <strong>indefinitely</strong>. The first supported version is 4; the version numbers 1-3 are used by the legacy
  * "GitHub Repo List" format.
  *
  * <p>
+ * After the initial contact, the client may send any number of commands before closing the connection.
+ * A command consists of one line with the command name and the command's arguments separated by whitespaces,
+ * terminated by \n. The command line is followed by any number of argument lines if defined in the command's
+ * specification. In protocol version 6 and newer, the command name is prefixed by the command version (CV)
+ * followed by a colon; in older protocol versions the default command version as stated for each command
+ * individually is assumed.
+ *
+ * <p>
  * All arguments to commands are whitespace-terminated strings.
  * The return value is a <code>\n</code>-terminated string.
  *
@@ -106,15 +114,27 @@
  */
 public enum Command {
 	/**
-	 * <code>CMD_LIST [5+: all]</code>
+	 * <code>CMD_LIST [2+: control]</code>
 	 *
 	 * <p>
-	 * List all available add-on names.
+	 * Supported command versions: 1-2 (default: 4/1, 5/2)
 	 *
 	 * <p>
-	 * In version 4, no arguments are accepted.
-	 * In version 5, a boolean argument is required to indicate whether to list
-	 * all add-ons or only add-ons compatible with the Widelands version.
+	 * List all available add-on names.
+	 *
+	 * <ul>
+	 * <li> In CV 1, no arguments are accepted.
+	 * <li> In CV 2+, a "control" argument is required to finetune the behaviour.
+	 * Supported values (case-insensitive) are:
+	 * <ul>
+	 * <li> true – List all add-ons.
+	 * <li> false – List add-ons compatible with the Widelands version.
+	 * <li> showall – List all add-ons, and append the response for a
+	 *                CMD_INFO for each add-on to the reply.
+	 * <li> showcompatible – List add-ons compatible with the Widelands version, and append
+	 *                       the response for a CMD_INFO for each add-on to the reply.
+	 * </ul>
+	 * </ul>
 	 *
 	 * <p>
 	 * Returns:
@@ -130,6 +150,9 @@ public enum Command {
 	 * <code>CMD_INFO name</code>
 	 *
 	 * <p>
+	 * Supported command versions: 1-2 (default: 4/1, 5/2)
+	 *
+	 * <p>
 	 * Returns detailed info about a specific addon.
 	 *
 	 * <p> Parameters:
@@ -146,8 +169,8 @@ public enum Command {
 	 *  <li> localized description, <code>\n</code>
 	 *  <li> unlocalized author, <code>\n</code>
 	 *  <li> localized author, <code>\n</code>
-	 *  <li> {@literal Protocol version <= 4}: name of the main uploader, <code>\n</code>
-	 *  <li> {@literal Protocol version >= 5}: comma-separated list of uploaders, <code>\n</code>
+	 *  <li> CV 1: name of the main uploader, <code>\n</code>
+	 *  <li> CV 2+: comma-separated list of uploaders, <code>\n</code>
 	 *  <li> add-on version string, <code>\n</code>
 	 *  <li> i18n version string, <code>\n</code>
 	 *  <li> category string, <code>\n</code>
@@ -166,7 +189,7 @@ public enum Command {
 	 *  <li> number of comments, <code>\n</code>
 	 *  <li> for each comment:
 	 * <ul>
-	 *      <li> {@literal Protocol version >= 5}: Comment ID, <code>\n</code>
+	 *      <li> CV 2+: Comment ID, <code>\n</code>
 	 *      <li> name, <code>\n</code>,
 	 *      <li> timestamp, <code>\n</code>,
 	 *      <li> last editor name (may be empty), <code>\n</code>,
@@ -176,7 +199,7 @@ public enum Command {
 	 *      <li> message, <code>\n</code>
 	 * </ul>
 	 *  <li> "verified" or "unchecked", <code>\n</code>
-	 *  <li> {@literal Protocol version >= 5}: Code quality rating (1-3) <code>\n</code>
+	 *  <li> CV 2+: Code quality rating (1-3) <code>\n</code>
 	 *  <li> icon checksum (0 for no icon), <code>\n</code>
 	 *  <li> icon filesize (0 for no icon), <code>\n</code>
 	 *  <li> icon file as a byte stream
@@ -189,6 +212,9 @@ public enum Command {
 	 * <code>CMD_DOWNLOAD name</code>
 	 *
 	 * <p>
+	 * Supported command versions: 1 (default: 1)
+	 *
+	 * <p>
 	 * Download an add-on as a byte stream.
 	 *
 	 * <p> Parameters:
@@ -217,6 +243,9 @@ public enum Command {
 	 * <code>CMD_I18N name</code>
 	 *
 	 * <p>
+	 * Supported command versions: 1 (default: 1)
+	 *
+	 * <p>
 	 * Download an add-on's translations as a byte stream.
 	 *
 	 * <p> Parameters:
@@ -242,6 +271,9 @@ public enum Command {
 	 * <code>CMD_SCREENSHOT addon screenshot</code>
 	 *
 	 * <p>
+	 * Supported command versions: 1 (default: 1)
+	 *
+	 * <p>
 	 * Download a screenshot.
 	 *
 	 * <p> Parameters:
@@ -265,6 +297,9 @@ public enum Command {
 	 * <code>CMD_VOTE name vote</code>
 	 *
 	 * <p>
+	 * Supported command versions: 1 (default: 1)
+	 *
+	 * <p>
 	 * Vote on an add-on.
 	 *
 	 * <p> Parameters:
@@ -282,6 +317,9 @@ public enum Command {
 	 * <code>CMD_GET_VOTE name</code>
 	 *
 	 * <p>
+	 * Supported command versions: 1 (default: 1)
+	 *
+	 * <p>
 	 * How the user voted an add-on.
 	 *
 	 * <p> Parameters:
@@ -298,6 +336,9 @@ public enum Command {
 	 * <code>CMD_COMMENT name version lines</code>
 	 *
 	 * <p>
+	 * Supported command versions: 1 (default: 1)
+	 *
+	 * <p>
 	 * Comment on an add-on.
 	 *
 	 * <p> Parameters:
@@ -314,20 +355,23 @@ public enum Command {
 	CMD_COMMENT,
 
 	/**
-	 * <code>CMD_EDIT_COMMENT [4: name] index lines</code>
+	 * <code>CMD_EDIT_COMMENT [CV 1: name] index lines</code>
+	 *
+	 * <p>
+	 * Supported command versions: 1-2 (default: 4/1, 5/2)
 	 *
 	 * <p>
 	 * Edit an existing comment.
 	 *
 	 * <p> Parameters:
 	 * <ul>
-	 * <li> Protocol version 4:
+	 * <li> CV 1:
 	 * <ol>
 	 *     <li> Add-on name
 	 *     <li> Index of the comment.
 	 *     <li> Number of lines in the message
 	 * </ol>
-	 * <li> Protocol version 5:
+	 * <li> CV 2+:
 	 * <ol>
 	 *     <li> Database ID of the comment.
 	 *     <li> Number of lines in the message
@@ -336,7 +380,7 @@ public enum Command {
 	 * Then, on separate lines, the actual message; then <code>ENDOFSTREAM\n</code>.
 	 *
 	 * <p>
-	 * In {@literal protocol version >= 5}, 0 lines denote deletion of the comment.
+	 * In CV 2+, 0 lines denote deletion of the comment.
 	 *
 	 * <p>
 	 * Returns: <code>ENDOFSTREAM\n</code> or an error message followed by <code>\n</code>
@@ -347,6 +391,9 @@ public enum Command {
 	 * <code>CMD_SUBMIT name</code>
 	 *
 	 * <p>
+	 * Supported command versions: 1 (default: 1)
+	 *
+	 * <p>
 	 * Upload an add-on.
 	 *
 	 * <p> Parameters:
@@ -365,6 +412,9 @@ public enum Command {
 	 * <code>CMD_SUBMIT_SCREENSHOT name filesize checksum whitespaces description</code>
 	 *
 	 * <p>
+	 * Supported command versions: 1 (default: 1)
+	 *
+	 * <p>
 	 * Upload a screenshot.
 	 *
 	 * <p> Parameters:
@@ -387,6 +437,9 @@ public enum Command {
 	 * <code>CMD_CONTACT lines</code>
 	 *
 	 * <p>
+	 * Supported command versions: 1 (default: 1)
+	 *
+	 * <p>
 	 * Send an enquiry to the Widelands Development Team.
 	 *
 	 * <p> Parameters:
@@ -404,12 +457,22 @@ public enum Command {
 	 * <code>CMD_SETUP_TX name</code>
 	 *
 	 * <p>
+	 * Supported command versions: 1-2 (default: 1)
+	 *
+	 * <p>
 	 * Set up transifex integration for an add-on. Only admins may do this.
 	 *
 	 * <p> Parameters:
 	 * <ol>
 	 * <li> Add-on name
 	 * </ol>
+	 * In CV 2+, then on separate lines:
+	 * <ul>
+	 * <li> Priority
+	 * <li> Display Name
+	 * <li> Categories (a JSON list of 1 or more strings)
+	 * <li> ENDOFSTREAM
+	 * </ul>
 	 *
 	 * <p>
 	 * Returns: <code>ENDOFSTREAM\n</code> or an error message followed by <code>\n</code>
@@ -420,6 +483,9 @@ public enum Command {
 	 * <code>CMD_ADMIN_DELETE name lines</code>
 	 *
 	 * <p>
+	 * Supported command versions: 1 (default: 1)
+	 *
+	 * <p>
 	 * Added in protocol version 5.
 	 * Irrevocably delete an add-on and all its metadata and translations from
 	 * the server and from Transifex. Only admins may do this.
@@ -441,6 +507,9 @@ public enum Command {
 	 * <code>CMD_ADMIN_VERIFY name verify</code>
 	 *
 	 * <p>
+	 * Supported command versions: 1 (default: 1)
+	 *
+	 * <p>
 	 * Added in protocol version 5.
 	 * Change the verification status of an add-on. Only admins may do this.
 	 *
@@ -459,6 +528,9 @@ public enum Command {
 	 * <code>CMD_ADMIN_QUALITY name quality</code>
 	 *
 	 * <p>
+	 * Supported command versions: 1 (default: 1)
+	 *
+	 * <p>
 	 * Added in protocol version 5.
 	 * Change the quality rating of an add-on. Only admins may do this.
 	 *
@@ -477,6 +549,9 @@ public enum Command {
 	 * <code>CMD_ADMIN_SYNC_SAFE name state</code>
 	 *
 	 * <p>
+	 * Supported command versions: 1 (default: 1)
+	 *
+	 * <p>
 	 * Added in protocol version 5.
 	 * Change the sync safety status of an add-on. Only admins may do this.
 	 *