PIN support added

pom.xml

@@ -6,7 +6,7 @@
 
     <groupId>ru.perveevm</groupId>
     <artifactId>polygon-api</artifactId>
-    <version>0.2</version>
+    <version>0.3</version>
 
     <properties>
         <maven.compiler.source>15</maven.compiler.source>

src/main/java/ru/perveevm/polygon/api/PolygonSession.java

@@ -46,7 +46,7 @@ public class PolygonSession implements Closeable {
     private final CloseableHttpClient client = HttpClients.createDefault();
     private final Gson gson = new Gson();
 
-    // TODO pin
+    private String pin = null;
 
     /**
      * Initializes Polygon session with API key.
@@ -64,6 +64,16 @@ public void close() throws IOException {
         client.close();
     }
 
+    /**
+     * Sets <code>pin</code> that will be used in all following requests. You can set it to <code>null</code> if no pin
+     * is required.
+     *
+     * @param pin Polygon pin code for problem or contest access.
+     */
+    public void setPin(final String pin) {
+        this.pin = pin;
+    }
+
     /**
      * Returns a list of problems, available to the user, according to search parameters.
      *
@@ -771,6 +781,9 @@ private JsonElement sendAPIRequest(final String method, final String methodName,
     private HttpResponse getAPIResponse(final String methodName, final List<NameValuePair> parameters)
             throws PolygonSessionException {
         List<NameValuePair> extendedParameters = new ArrayList<>(parameters);
+        if (pin != null) {
+            extendedParameters.add(new BasicNameValuePair("pin", pin));
+        }
         extendedParameters.add(new BasicNameValuePair("apiKey", key));
         extendedParameters.add(new BasicNameValuePair("time", String.valueOf(System.currentTimeMillis() / 1000)));
         extendedParameters.add(new BasicNameValuePair("apiSig", generateApiSig(methodName, extendedParameters)));