feat: add connection state recovery and flexible auth

- Implement Socket.IO v4 connection state recovery
  * Track PID and offset for session restoration
  * Add isRecovered() and getLastOffset() methods
  * Replay missed events after reconnect

- Change auth from Map to JSONObject for flexibility

- Upgrade test server from Socket.IO v3.0.4 to v4.8.1
  * Fix tests for v4 offset parameter
  * Fix namespace emission bugs

BREAKING CHANGE: auth is now JSONObject instead of Map<String,String>

Author: RobinPcrd

pom.xml

@@ -2,7 +2,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>io.socket</groupId>
   <artifactId>socket.io-client</artifactId>
-  <version>2.1.3-SNAPSHOT</version>
+  <version>2.1.52-SNAPSHOT</version>
   <packaging>jar</packaging>
   <name>socket.io-client</name>
   <description>Socket.IO Client Library for Java</description>
@@ -102,20 +102,6 @@
 
   <build>
     <plugins>
-      <plugin>
-        <groupId>org.apache.maven.plugins</groupId>
-        <artifactId>maven-compiler-plugin</artifactId>
-        <version>3.5.1</version>
-        <configuration>
-          <source>1.7</source>
-          <target>1.7</target>
-          <compilerArgs>
-            <arg>-Xlint:unchecked</arg>
-          </compilerArgs>
-          <showWarnings>true</showWarnings>
-          <showDeprecation>true</showDeprecation>
-        </configuration>
-      </plugin>
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-surefire-plugin</artifactId>
@@ -207,7 +193,7 @@
               <workingDirectory>./src/test/resources</workingDirectory>
               <executable>npm</executable>
               <arguments>
-                  <argument>install</argument>
+                <argument>install</argument>
               </arguments>
             </configuration>
           </execution>
@@ -223,6 +209,44 @@
         <artifactId>maven-site-plugin</artifactId>
         <version>3.9.1</version>
       </plugin>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-compiler-plugin</artifactId>
+        <version>3.5.1</version>
+        <executions>
+          <execution>
+            <id>default-compile</id>
+            <phase>none</phase>
+          </execution>
+          <execution>
+            <id>default-testCompile</id>
+            <phase>none</phase>
+          </execution>
+          <execution>
+            <id>compile</id>
+            <phase>compile</phase>
+            <goals>
+              <goal>compile</goal>
+            </goals>
+          </execution>
+          <execution>
+            <id>testCompile</id>
+            <phase>test-compile</phase>
+            <goals>
+              <goal>testCompile</goal>
+            </goals>
+          </execution>
+        </executions>
+        <configuration>
+          <source>1.8</source>
+          <target>1.8</target>
+          <compilerArgs>
+            <arg>-Xlint:unchecked</arg>
+          </compilerArgs>
+          <showWarnings>true</showWarnings>
+          <showDeprecation>true</showDeprecation>
+        </configuration>
+      </plugin>
     </plugins>
   </build>
 </project>

src/main/java/io/socket/client/Manager.java

@@ -9,6 +9,7 @@
 import io.socket.thread.EventThread;
 import okhttp3.Call;
 import okhttp3.WebSocket;
+import org.json.JSONObject;
 
 import java.net.URI;
 import java.util.*;
@@ -562,7 +563,7 @@ public static class Options extends io.socket.engineio.client.Socket.Options {
         public double randomizationFactor;
         public Parser.Encoder encoder;
         public Parser.Decoder decoder;
-        public Map<String, String> auth;
+        public JSONObject auth;
 
         /**
          * Connection timeout (ms). Set -1 to disable.