DatingDapp

Summary

The contract's implementation of the token URI relies on _baseURI(), which by default returns an empty string. This can lead to an improperly formatted token URI, potentially causing issues when interfacing with wallets or platforms that expect a specific URI format (e.g., a data URI prefix).

Vulnerability Details

• Default Behavior: OpenZeppelin’s ERC721 implementation of _baseURI() returns an empty string. As a result, when concatenating the Base64-encoded JSON metadata, the expected prefix (such as "data:application/json;base64,") is missing.

• Formatting Issue: The lack of the correct prefix can cause external systems and clients to misinterpret the token metadata or fail to load it altogether.

• Assumption Mismatch: Developers might assume that _baseURI() is correctly configured, leading to integration issues if the token URI is not in the expected format.

Impact

• Interoperability Problems: Wallets, marketplaces, or other platforms expecting a properly formatted data URI may not display the NFT metadata correctly.

• User Experience: This could result in a degraded user experience where NFT details (like profile information) are not properly rendered.

• Maintenance Confusion: Future maintainers might overlook this subtle issue, leading to persistent integration bugs.

Tools Used

• Manual Code Review

• Analysis of OpenZeppelin ERC721 documentation and source code

Recommendations

• Override _baseURI(): Modify the _baseURI() function to return the appropriate prefix for on-chain metadata. For example:

  function _baseURI() internal pure override returns (string memory) {

  return "data:application/json;base64,";

  }