feat(initsession): add synchronous init session by credentials method

glpi/src/androidTest/java/org/flyve/glpi/GLPITest.java

+package org.flyve.glpi;
+
+import android.content.Context;
+import android.support.test.InstrumentationRegistry;
+import android.support.test.runner.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import static org.junit.Assert.*;
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+@RunWith(AndroidJUnit4.class)
+public class ExampleInstrumentedTest {
+    @Test
+    public void useAppContext() throws Exception {
+        // Context of the app under test.
+        Context appContext = InstrumentationRegistry.getTargetContext();
+
+        assertEquals("org.flyve.glpi.test", appContext.getPackageName());
+    }
+}

glpi/src/main/java/org/flyve/glpi/GLPI.java

@@ -27,8 +27,10 @@ package org.flyve.glpi;
 
 import android.content.Context;
 import android.util.Log;
+
 import com.google.gson.JsonArray;
 import com.google.gson.JsonObject;
+
 import org.flyve.glpi.query.GetAllItemQuery;
 import org.flyve.glpi.query.GetAnItemQuery;
 import org.flyve.glpi.query.GetSubItemQuery;
@@ -38,8 +40,10 @@ import org.flyve.glpi.request.LostPasswordRequest;
 import org.flyve.glpi.request.RecoveryPasswordRequest;
 import org.flyve.glpi.response.InitSession;
 import org.flyve.glpi.utils.Helpers;
+
 import java.util.HashMap;
 import java.util.Map;
+
 import retrofit2.Call;
 import retrofit2.Callback;
 import retrofit2.Response;
@@ -113,6 +117,24 @@ public class GLPI extends ServiceGenerator {
         });
     }
 
+    /**
+     * Synchronous Request a session token to uses other api endpoints. with a couple login & password: 2 parameters to login with user authentication
+     * @param user valid user on GLPI
+     * @param password valid password on GLPI
+     * @return SessionToken
+     */
+    public String initSessionByCredentialsSync(String user, String password) {
+        String authorization = Helpers.base64encode( user + ":" + password );
+
+        Call<InitSession> responseCall = interfaces.initSessionByCredentials("Basic " + authorization.trim());
+
+        try {
+            return responseCall.execute().body().getSessionToken();
+        } catch (Exception ex) {
+            return "";
+        }
+    }
+
     /**
      * Request a session token to uses other api endpoints. with a couple login & password: 2 parameters to login with user authentication
      * @param user valid user on GLPI