added 165 protocol and support for it in 721

Author: TonioMacaronio

web3swift.xcodeproj/project.pbxproj

@@ -210,6 +210,7 @@
 		E228BED021A4C89F0085268C /* Web3Legacy+Eth.swift in Sources */ = {isa = PBXBuildFile; fileRef = E228BEC921A4C89E0085268C /* Web3Legacy+Eth.swift */; };
 		E228BED121A4C89F0085268C /* Web3Legacy+Instance.swift in Sources */ = {isa = PBXBuildFile; fileRef = E228BECA21A4C89F0085268C /* Web3Legacy+Instance.swift */; };
 		E228BED221A4C89F0085268C /* Web3Legacy+Instance.swift in Sources */ = {isa = PBXBuildFile; fileRef = E228BECA21A4C89F0085268C /* Web3Legacy+Instance.swift */; };
+		E279C9EF21C46A140081695F /* Web3+ERC165.swift in Sources */ = {isa = PBXBuildFile; fileRef = E279C9EE21C46A140081695F /* Web3+ERC165.swift */; };
 		E2DCA653218C875100F94FBA /* web3swift_ENS_Tests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 81A7B2782143C978004CD2C7 /* web3swift_ENS_Tests.swift */; };
 		E2DCA654218C879900F94FBA /* ENS.swift in Sources */ = {isa = PBXBuildFile; fileRef = B2E668CD214F8A7B00C3CC2D /* ENS.swift */; };
 		E2DCA655218C879900F94FBA /* ENSResolver.swift in Sources */ = {isa = PBXBuildFile; fileRef = B219DC162154F3EE0035BF94 /* ENSResolver.swift */; };
@@ -390,6 +391,7 @@
 		E23B5ADC20EA685D00DC7F32 /* web3swift_EIP67_Tests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = web3swift_EIP67_Tests.swift; sourceTree = "<group>"; };
 		E23B5AE020EA695400DC7F32 /* web3swift_rinkeby_personalSignature_Tests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = web3swift_rinkeby_personalSignature_Tests.swift; sourceTree = "<group>"; };
 		E23B5AE220EA69B900DC7F32 /* web3swift_numberFormattingUtil_Tests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = web3swift_numberFormattingUtil_Tests.swift; sourceTree = "<group>"; };
+		E279C9EE21C46A140081695F /* Web3+ERC165.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "Web3+ERC165.swift"; sourceTree = "<group>"; };
 		E2C590752152835400FF53D3 /* JSONRPCrequestDispatcher+ObjC.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "JSONRPCrequestDispatcher+ObjC.swift"; sourceTree = "<group>"; };
 		E2E94C5F217788E0005F54A0 /* Web3+ERC721.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "Web3+ERC721.swift"; sourceTree = "<group>"; };
 		FB43EC035C593F9E5A3644B6 /* Pods-web3swift-macOS.debug.xcconfig */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text.xcconfig; name = "Pods-web3swift-macOS.debug.xcconfig"; path = "Pods/Target Support Files/Pods-web3swift-macOS/Pods-web3swift-macOS.debug.xcconfig"; sourceTree = "<group>"; };
@@ -610,6 +612,7 @@
 		8159C50921343EF900197B91 /* PrecompiledContracts */ = {
 			isa = PBXGroup;
 			children = (
+				E279C9ED21C3F2970081695F /* ERC165 */,
 				E2E94C5E2177886C005F54A0 /* ERC721 */,
 				8159C50621343ED300197B91 /* ERC20 */,
 			);
@@ -945,6 +948,14 @@
 			path = Classes;
 			sourceTree = "<group>";
 		};
+		E279C9ED21C3F2970081695F /* ERC165 */ = {
+			isa = PBXGroup;
+			children = (
+				E279C9EE21C46A140081695F /* Web3+ERC165.swift */,
+			);
+			path = ERC165;
+			sourceTree = "<group>";
+		};
 		E2E94C5E2177886C005F54A0 /* ERC721 */ = {
 			isa = PBXGroup;
 			children = (
@@ -1251,6 +1262,7 @@
 				81A1823720D6E2BB0016741F /* Promise+Web3+Eth+GetBlockByHash.swift in Sources */,
 				81909D51218DAEC0007D2AE5 /* Promise+Web3+Personal+CreateAccount.swift in Sources */,
 				818D16CF204D42910084D2A4 /* Web3+EventParser.swift in Sources */,
+				E279C9EF21C46A140081695F /* Web3+ERC165.swift in Sources */,
 				81C5DA282072E18200424CD6 /* NativeTypesEncoding+Extensions.swift in Sources */,
 				8123E1C7200CBAC200B6D3AB /* Dictionary+Extension.swift in Sources */,
 				E228BE7421A4492B0085268C /* Promise+Web3Legacy+Eth+Call.swift in Sources */,

web3swift/PrecompiledContracts/ERC165/Web3+ERC165.swift

@@ -0,0 +1,18 @@
+//
+//  Web3+ERC165.swift
+//  web3swift-iOS
+//
+//  Created by Anton Grigorev on 15/12/2018.
+//  Copyright © 2018 The Matter Inc. All rights reserved.
+//
+
+import Foundation
+import BigInt
+import PromiseKit
+import EthereumAddress
+
+protocol IERC165 {
+    
+    func supportsInterface(interfaceID: [UInt8]) throws -> Bool
+    
+}

web3swift/PrecompiledContracts/ERC721/Web3+ERC721.swift

@@ -11,7 +11,7 @@ import EthereumAddress
 
 // This namespace contains functions to work with ERC721 tokens.
 // can be imperatively read and saved
-public class ERC721 {
+public class ERC721: IERC165 {
 
     @available(*, deprecated, renamed: "transactionOptions")
     public var options: Web3Options = .init()
@@ -178,4 +178,14 @@ public class ERC721 {
         return tx
     }
 
+    public func supportsInterface(interfaceID: [UInt8]) throws -> Bool {
+        let contract = self.contract
+        var transactionOptions = TransactionOptions()
+        transactionOptions.callOnBlock = .latest
+        transactionOptions.gasLimit = .manual(30000)
+        let result = try contract.read("supportsInterface", parameters: [interfaceID] as [AnyObject], extraData: Data(), transactionOptions: self.transactionOptions)!.call(transactionOptions: transactionOptions)
+        guard let res = result["0"] as? Bool else {throw Web3Error.processingError(desc: "Failed to get result of expected type from the Ethereum node")}
+        return res
+    }
+    
 }