Add support for the license server (#21)

* Add license server url to all API models

* Update HelperMethods.java

* Update

Author: artemlos

README.md

@@ -123,3 +123,40 @@ public static void main(String args[]) {
     }
 }
 ```
+
+### Calling through the license server
+If you would like to re-route the requests through our [license-server](https://github.com/cryptolens/license-server) that is installed on the client site, you can specify its url using `LicenseServerUrl`
+parameter. All API models expose this parameter. 
+
+For example, let's suppose that your client runs the license server on `http://10.1.1.6:8080` and you want to call `Key.GetKey()`. In this case, we first define all parameters for the request and then
+modify the license server url:
+
+```java
+GetKeyModel model = new GetKeyModel(3349, "ICVLD-VVSZR-ZTICT-YKGXL");
+model.LicenseServerUrl = "http://10.1.1.6:8080";
+```
+
+We do this because there is currently no overload method that accepts `LicenseServerUrl` parameter.
+
+The entire code is shown below:
+
+```java
+String RSAPubKey = "<RSAKeyValue><Modulus>sGbvxwdlDbqFXOMlVUnAF5ew0t0WpPW7rFpI5jHQOFkht/326dvh7t74RYeMpjy357NljouhpTLA3a6idnn4j6c3jmPWBkjZndGsPL4Bqm+fwE48nKpGPjkj4q/yzT4tHXBTyvaBjA8bVoCTn+LiC4XEaLZRThGzIn5KQXKCigg6tQRy0GXE13XYFVz/x1mjFbT9/7dS8p85n8BuwlY5JvuBIQkKhuCNFfrUxBWyu87CFnXWjIupCD2VO/GbxaCvzrRjLZjAngLCMtZbYBALksqGPgTUN7ZM24XbPWyLtKPaXF2i4XRR9u6eTj5BfnLbKAU5PIVfjIS+vNYYogteQ==<Modulus><Exponent>AQAB</Exponent></RSAKeyValue>";
+
+String auth = APIKey.get("getkeyactivate");
+
+APIError error = new APIError();
+
+GetKeyModel model = new GetKeyModel(3349, "ICVLD-VVSZR-ZTICT-YKGXL");
+model.LicenseServerUrl = "http://10.1.1.6:8080";
+
+LicenseKey license = Key.GetKey(auth, RSAPubKey, model , error);
+
+if (license == null) {
+    System.out.println("The license does not work.");
+    System.out.println("Error: " + error.message);
+} else {
+    System.out.println("The license is valid!");
+    System.out.println("It will expire: " + license.Expires);
+}
+```

src/main/java/io/cryptolens/internal/HelperMethods.java

@@ -5,6 +5,7 @@
 import io.cryptolens.legacy.RequestHandler;
 import io.cryptolens.models.APIError;
 import io.cryptolens.models.ErrorType;
+import io.cryptolens.models.RequestModel;
 
 import java.lang.reflect.Field;
 import java.lang.reflect.Type;
@@ -16,22 +17,29 @@
 
 public class HelperMethods {
 
-    public static <T extends BasicResult> T SendRequestToWebAPI(String method, Object model, Map<String,String> extraParams, Class<T> clazz) {
+    public static <T extends BasicResult> T SendRequestToWebAPI(String method, RequestModel model, Map<String,String> extraParams, Class<T> clazz) {
         return SendRequestToWebAPI(method, model, extraParams, clazz, null);
     }
 
-    public static <T extends BasicResult> T SendRequestToWebAPI(String method, Object model, Map<String,String> extraParams, Class<T> clazz, APIError error) {
+    public static <T extends BasicResult> T SendRequestToWebAPI(String method, RequestModel model, Map<String,String> extraParams, Class<T> clazz, APIError error) {
 
         Map<String,String> params = new HashMap<>();
         List<Field> allFields = new ArrayList<>();
         getAllFields(allFields, model.getClass());
 
+        String licenseServerUrl = "https://app.cryptolens.io";
+
         for(Field field : allFields) {
             field.setAccessible(true);
             try {
                 Object value = field.get(model);
                 if(value != null) {
-                    params.put(field.getName(), value.toString());
+
+                    if(field.getName() == "LicenseServerUrl") {
+                        licenseServerUrl = value.toString();
+                    } else {
+                        params.put(field.getName(), value.toString());
+                    }
                 }
             } catch (Exception ex) {
                 if(error != null) {
@@ -48,7 +56,7 @@ public static <T extends BasicResult> T SendRequestToWebAPI(String method, Objec
 
         try {
 
-            String response = requestHandler.makePostRequest("https://app.cryptolens.io/api/" + method, params);
+            String response = requestHandler.makePostRequest(licenseServerUrl + "/api/" + method, params);
 
             Gson gson = new GsonBuilder().registerTypeAdapter(LocalDateTime.class, new JsonDeserializer<LocalDateTime>() {
                 @Override

src/main/java/io/cryptolens/legacy/HttpsURLConnectionRequestHandler.java

@@ -9,7 +9,9 @@
 public class HttpsURLConnectionRequestHandler implements RequestHandler {
   public String makePostRequest(String url, Map<String,String> params) throws Exception {
     URL url_ = new URL(url);
-    HttpsURLConnection connection = (HttpsURLConnection)url_.openConnection();
+
+    // HttpsURLConnection extends HttpURLConnection
+    HttpURLConnection connection = (HttpURLConnection)url_.openConnection();
     connection.setRequestMethod("POST");
 
     connection.setDoOutput(true);

src/main/java/io/cryptolens/methods/ProductMethods.java

@@ -2,6 +2,8 @@
 
 import io.cryptolens.internal.*;
 import io.cryptolens.models.GetProductsResult;
+import io.cryptolens.models.RequestModel;
+
 import java.util.*;
 
 /**
@@ -19,6 +21,6 @@ public static GetProductsResult GetProducts (String token) {
         Map<String, String> extraParams = new HashMap<>();
         extraParams.put("token", token);
 
-        return HelperMethods.SendRequestToWebAPI("product/GetProducts", new Object(), extraParams, GetProductsResult.class);
+        return HelperMethods.SendRequestToWebAPI("product/GetProducts", new RequestModel(), extraParams, GetProductsResult.class);
     }
 }

src/main/java/io/cryptolens/models/ActivateModel.java

@@ -3,7 +3,7 @@
 /**
  * The parameters that are used when calling the Key.Activate method.
  */
-public class ActivateModel {
+public class ActivateModel extends RequestModel {
 
     /**
      * The product id, which can be found on the product page.
@@ -48,7 +48,7 @@ public class ActivateModel {
     public int MaxOverdraft;
 
     /**
-     * Allows you to specify a friendy name for the activated device, for example the employee's email.
+     * Allows you to specify a friendly name for the activated device, for example the employee's email.
      * Friendly name does not impact the number of active machine codes / seats, but it offers an easy way
      * of linking a machine/seat with a user. For added security, you can HMAC hash this value.
      * <br/>

src/main/java/io/cryptolens/models/CreateTrialKeyModel.java

@@ -1,6 +1,6 @@
 package io.cryptolens.models;
 
-public class CreateTrialKeyModel {
+public class CreateTrialKeyModel extends RequestModel {
     public int ProductId;
     public String MachineCode;
 

src/main/java/io/cryptolens/models/DeactivateModel.java

@@ -1,6 +1,6 @@
 package io.cryptolens.models;
 
-public class DeactivateModel {
+public class DeactivateModel extends RequestModel {
 
     public int ProductId;
     public String Key;

src/main/java/io/cryptolens/models/GetKeyModel.java

@@ -4,7 +4,7 @@
  * The parameters that are used when calling the Key.GetKey method.
  */
 
-public class GetKeyModel {
+public class GetKeyModel extends RequestModel {
     /**
      * The product id, which can be found on the product page.
      */

src/main/java/io/cryptolens/models/ProductAndKeyModel.java

@@ -1,6 +1,6 @@
 package io.cryptolens.models;
 
-public abstract class ProductAndKeyModel {
+public abstract class ProductAndKeyModel extends RequestModel{
     /**
      * The product id.
      */

src/main/java/io/cryptolens/models/RecordUsageModel.java

@@ -1,6 +1,6 @@
 package io.cryptolens.models;
 
-public class RecordUsageModel {
+public class RecordUsageModel extends RequestModel {
     public int ProductId;
     public String Key;
     public int Amount;