Added request to add modifiers to forts, for example a lure-module on a pokestop (#217)

* implemented request to add fort modifier

* added @throws to javadoc for addModifier in Pokestop.java

Author: aschlosser

src/main/java/com/pokegoapi/api/map/fort/Pokestop.java

@@ -15,10 +15,13 @@
 
 package com.pokegoapi.api.map.fort;
 
+import POGOProtos.Inventory.Item.ItemIdOuterClass;
 import POGOProtos.Map.Fort.FortDataOuterClass;
+import POGOProtos.Networking.Requests.Messages.AddFortModifierMessageOuterClass.AddFortModifierMessage;
 import POGOProtos.Networking.Requests.Messages.FortDetailsMessageOuterClass.FortDetailsMessage;
 import POGOProtos.Networking.Requests.Messages.FortSearchMessageOuterClass.FortSearchMessage;
 import POGOProtos.Networking.Requests.RequestTypeOuterClass;
+import POGOProtos.Networking.Responses.AddFortModifierResponseOuterClass;
 import POGOProtos.Networking.Responses.FortDetailsResponseOuterClass;
 import POGOProtos.Networking.Responses.FortSearchResponseOuterClass;
 import com.google.protobuf.InvalidProtocolBufferException;
@@ -126,6 +129,31 @@ public PokestopLootResult loot() throws LoginFailedException, RemoteServerExcept
 		return new PokestopLootResult(response);
 	}
 
+	/**
+	 * Adds a modifier to this pokestop. (i.e. add a lure module)
+	 *
+	 * @param item the modifier to add to this pokestop
+	 * @throws LoginFailedException if login failed
+	 * @throws RemoteServerException if the server failed to respond or the modifier could not be added to this pokestop
+	 */
+	public void addModifier(ItemIdOuterClass.ItemId item) throws LoginFailedException, RemoteServerException {
+		AddFortModifierMessage msg = AddFortModifierMessage.newBuilder()
+				.setModifierType(item)
+				.setFortId(getId())
+				.setPlayerLatitude(api.getLatitude())
+				.setPlayerLongitude(api.getLongitude())
+				.build();
+		ServerRequest serverRequest = new ServerRequest(RequestTypeOuterClass.RequestType.ADD_FORT_MODIFIER, msg);
+		api.getRequestHandler().sendServerRequests(serverRequest);
+		AddFortModifierResponseOuterClass.AddFortModifierResponse response;
+		try {
+			//sadly the server response does not contain any information to verify if the request was successful
+			response = AddFortModifierResponseOuterClass.AddFortModifierResponse.parseFrom(serverRequest.getData());
+		} catch (InvalidProtocolBufferException e) {
+			throw new RemoteServerException(e);
+		}
+	}
+
 	/**
 	 * Get more detailed information about a pokestop.
 	 *