Add ERC165 to the SBT contract (#69)

Author: Hrom131

contracts/interfaces/tokens/ISBT.sol

@@ -5,8 +5,7 @@ pragma solidity ^0.8.4;
  * @notice The SBT module
  */
 interface ISBT {
-    event Minted(address to, uint256 tokenId);
-    event Burned(address from, uint256 tokenId);
+    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);
 
     function name() external view returns (string memory);
 

contracts/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@solarity/solidity-lib",
-  "version": "2.6.1",
+  "version": "2.6.2",
   "license": "MIT",
   "author": "Distributed Lab",
   "readme": "README.md",

contracts/tokens/SBT.sol

@@ -1,7 +1,8 @@
 // SPDX-License-Identifier: MIT
 pragma solidity ^0.8.4;
 
-import {Initializable} from "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";
+import {ERC165Upgradeable} from "@openzeppelin/contracts-upgradeable/utils/introspection/ERC165Upgradeable.sol";
+import {IERC721Metadata} from "@openzeppelin/contracts/interfaces/IERC721Metadata.sol";
 import {Strings} from "@openzeppelin/contracts/utils/Strings.sol";
 import {EnumerableSet} from "@openzeppelin/contracts/utils/structs/EnumerableSet.sol";
 
@@ -15,7 +16,7 @@ import {ISBT} from "../interfaces/tokens/ISBT.sol";
  *
  * Has to be inherited in order to be useful in the project
  */
-abstract contract SBT is ISBT, Initializable {
+abstract contract SBT is ISBT, ERC165Upgradeable {
     using Strings for uint256;
     using EnumerableSet for EnumerableSet.UintSet;
 
@@ -134,6 +135,18 @@ abstract contract SBT is ISBT, Initializable {
         return "";
     }
 
+    /**
+     * @notice Returns true if this contract implements the interface defined by `interfaceId`
+     * @param interfaceId_ the interface ID to check
+     * @return true if the passed interface ID is supported, otherwise false
+     */
+    function supportsInterface(bytes4 interfaceId_) public view virtual override returns (bool) {
+        return
+            interfaceId_ == type(IERC721Metadata).interfaceId ||
+            interfaceId_ == type(ISBT).interfaceId ||
+            super.supportsInterface(interfaceId_);
+    }
+
     /**
      * @notice The function to mint the token
      * @param to_ the receiver of the token
@@ -148,7 +161,7 @@ abstract contract SBT is ISBT, Initializable {
         _balances[to_].add(tokenId_);
         _tokenOwners[tokenId_] = to_;
 
-        emit Minted(to_, tokenId_);
+        emit Transfer(address(0), to_, tokenId_);
     }
 
     /**
@@ -166,7 +179,7 @@ abstract contract SBT is ISBT, Initializable {
 
         delete _tokenURIs[tokenId_];
 
-        emit Burned(owner_, tokenId_);
+        emit Transfer(owner_, address(0), tokenId_);
     }
 
     /**

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "@solarity/solidity-lib",
-  "version": "2.6.1",
+  "version": "2.6.2",
   "license": "MIT",
   "author": "Distributed Lab",
   "description": "Solidity Library by Distributed Lab",

package.json

@@ -47,7 +47,7 @@ describe("SBT", () => {
 
   describe("mint()", () => {
     it("should correctly mint", async () => {
-      await sbt.mint(FIRST.address, 1337);
+      const tx = await sbt.mint(FIRST.address, 1337);
 
       expect(await sbt.tokenExists(1337)).to.be.true;
 
@@ -58,6 +58,8 @@ describe("SBT", () => {
       expect(await sbt.tokensOf(FIRST.address)).to.deep.equal([1337n]);
 
       expect(await sbt.tokenURI(1337)).to.equal("");
+
+      expect(tx).to.emit(sbt, "Transfer").withArgs(ZERO_ADDR, FIRST.address, 1337);
     });
 
     it("should not mint to null address", async () => {
@@ -73,7 +75,7 @@ describe("SBT", () => {
 
   describe("burn()", () => {
     it("should correctly burn", async () => {
-      await sbt.mint(FIRST.address, 1337);
+      const tx = await sbt.mint(FIRST.address, 1337);
 
       await sbt.burn(1337);
 
@@ -83,6 +85,8 @@ describe("SBT", () => {
       expect(await sbt.ownerOf(0)).to.equal(ZERO_ADDR);
 
       expect(await sbt.tokensOf(FIRST.address)).to.deep.equal([]);
+
+      expect(tx).to.emit(sbt, "Transfer").withArgs(FIRST.address, ZERO_ADDR, 1337);
     });
 
     it("should not burn SBT that doesn't exist", async () => {
@@ -129,4 +133,20 @@ describe("SBT", () => {
       expect(await sbt.tokenURI(1337)).to.equal("test");
     });
   });
+
+  describe("supportsInterface()", () => {
+    it("should return correct values", async () => {
+      const IERC721MetadaInterfaceID = "0x5b5e139f";
+      const ISBTInterfaceID = "0xddd872b5";
+      const IERC165InterfaceID = "0x01ffc9a7";
+
+      expect(await sbt.supportsInterface(IERC721MetadaInterfaceID)).to.be.eq(true);
+      expect(await sbt.supportsInterface(ISBTInterfaceID)).to.be.eq(true);
+      expect(await sbt.supportsInterface(IERC165InterfaceID)).to.be.eq(true);
+
+      const randomInterfaceID = "0xaaa1234d";
+
+      expect(await sbt.supportsInterface(randomInterfaceID)).to.be.eq(false);
+    });
+  });
 });