add collectibles contract

TestDappCollectibles.sol

@@ -0,0 +1,58 @@
+// SPDX-License-Identifier: MIT
+pragma solidity >=0.4.22 <0.9.0;
+
+import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
+import "@openzeppelin/contracts/utils/Counters.sol";
+import "@openzeppelin/contracts/utils/Strings.sol";
+import 'base64-sol/base64.sol';
+
+contract TestDappCollectibles is ERC721 {
+
+  using Counters for Counters.Counter;
+  Counters.Counter private _tokenIds;
+
+  constructor() ERC721('TestDappCollectibles', 'TDC') {}
+
+  function mintCollectibles(uint numberOfTokens) public {
+    for(uint i = 1; i <= numberOfTokens; i++) {
+      _tokenIds.increment();
+      uint tokenId = _tokenIds.current();
+      _safeMint(_msgSender(), tokenId);
+    }
+  }
+
+  function tokenURI(uint tokenId) public pure override returns (string memory) {
+    string memory svg = 
+    '<svg height="350" width="350" viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg">'
+    '<defs>'
+    '<path id="MyPath" fill="none" stroke="red" '
+    'd="M10,90 Q90,90 90,45 Q90,10 50,10 Q10,10 10,40 Q10,70 45,70 Q70,70 75,50" />'
+    '</defs>'
+    '<text>'
+    '<textPath href="#MyPath">'
+    'Quick brown fox jumps over the lazy dog.'
+    '</textPath>'
+    '</text>'
+    '</svg>';
+
+    string memory json = string(
+      abi.encodePacked(
+        '{"name": "Test Dapp Collectibles #',
+        Strings.toString(tokenId), 
+        '", "description": "Test Dapp Collectibles for testing.", "image": "data:image/svg+xml;base64,',
+        Base64.encode(bytes(svg)),
+        '", "attributes": [{"trait_type": "Token Id", "value": "',
+        Strings.toString(tokenId), 
+        '"}]}'
+      )
+    );
+
+    string memory uri = string(
+      abi.encodePacked(
+        "data:application/json;base64,", Base64.encode(bytes(json))
+      )
+    );
+
+    return uri;
+  }
+}

package.json

@@ -40,6 +40,8 @@
     "@metamask/eslint-config": "^6.0.0",
     "@metamask/eslint-config-nodejs": "^6.0.0",
     "@metamask/onboarding": "^1.0.0",
+    "@openzeppelin/contracts": "4.3.3",
+    "base64-sol": "1.1.0",
     "clean-webpack-plugin": "^3.0.0",
     "copy-webpack-plugin": "^6.0.2",
     "eslint": "^7.29.0",

yarn.lock

@@ -471,6 +471,11 @@
     node-gyp "^7.1.0"
     read-package-json-fast "^2.0.1"
 
+"@openzeppelin/contracts@4.3.3":
+  version "4.3.3"
+  resolved "https://registry.yarnpkg.com/@openzeppelin/contracts/-/contracts-4.3.3.tgz#ff6ee919fc2a1abaf72b22814bfb72ed129ec137"
+  integrity sha512-tDBopO1c98Yk7Cv/PZlHqrvtVjlgK5R4J6jxLwoO7qxK4xqOiZG+zSkIvGFpPZ0ikc3QOED3plgdqjgNTnBc7g==
+
 "@types/anymatch@*":
   version "1.3.1"
   resolved "https://registry.yarnpkg.com/@types/anymatch/-/anymatch-1.3.1.tgz#336badc1beecb9dacc38bea2cf32adf627a8421a"
@@ -1016,6 +1021,11 @@ base64-js@^1.0.2:
   resolved "https://registry.yarnpkg.com/base64-js/-/base64-js-1.3.1.tgz#58ece8cb75dd07e71ed08c736abc5fac4dbf8df1"
   integrity sha512-mLQ4i2QO1ytvGWFWmcngKO//JXAQueZvwEKtjgQFM4jIK0kU+ytMfplL8j+n5mspOfjHwoAg+9yhb7BwAHm36g==
 
+base64-sol@1.1.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/base64-sol/-/base64-sol-1.1.0.tgz#39c3c91a35790b6eb3b8e73114b46bacf0fc2865"
+  integrity sha512-mksLxtFyBcXd3LYK5UxyMj29YR//zoaeXpJaKRbnLQC0E99oCJl7VpKaJDXWAuTvnhxBU9XNYzhxSL8umsrxWg==
+
 base@^0.11.1:
   version "0.11.2"
   resolved "https://registry.yarnpkg.com/base/-/base-0.11.2.tgz#7bde5ced145b6d551a90db87f83c558b4eb48a8f"