Implementation of Metadata Extensions

[cloudvenger]

Description

Implement the functions of the Interface IERC3525Metadata of the EIP-3525.
EIP-3525 metadata extensions are compatible EIP-721 metadata extensions.

The IERC3525Metadata interface extension is OPTIONAL.

The list of functions are :

• contractURI
• slotURI

JSON Schema

This is the “EIP-3525 Metadata JSON Schema for contractURI()” referenced above.

{
  "title": "Contract Metadata",
  "type": "object",
  "properties": {
    "name": {
      "type": "string",
      "description": "Contract Name"
    },
    "description": {
      "type": "string",
      "description": "Describes the contract"
    },
    "image": {
      "type": "string",
      "description": "Optional. Either a base64 encoded imgae data or a URI pointing to a resource with mime type image/* representing what this contract represents."
    },
    "external_link": {
      "type": "string",
      "description": "Optional. A URI pointing to an external resource."
    },
    "valueDecimals": {
      "type": "integer",
      "description": "The number of decimal places that the balance should display - e.g. 18, means to divide the token value by 1000000000000000000 to get its user representation."
    }
  }
}

This is the “EIP-3525 Metadata JSON Schema for slotURI(uint)” referenced above.

{
  "title": "Slot Metadata",
  "type": "object",
  "properties": {
    "name": {
      "type": "string",
      "description": "Identifies the asset category to which this slot represents"
    },
    "description": {
      "type": "string",
      "description": "Describes the asset category to which this slot represents"
    },
    "image": {
      "type": "string",
      "description": "Optional. Either a base64 encoded imgae data or a URI pointing to a resource with mime type image/* representing the asset category to which this slot represents."
    },
    "properties": {
      "type": "array",
      "description": "Each item of `properties` SHOULD be organized in object format, including name, description, value, order (optional), display_type (optional), etc."
      "items": {
        "type": "object",
        "properties": {
          "name": {
            "type": "string",
            "description": "The name of this property."
          },
          "description": {
            "type": "string",
            "description": "Describes this property."
          }
          "value": {
            "description": "The value of this property, which may be a string or a number."
          },
          "is_intrinsic": {
            "type": "boolean",
            "description": "According to the definition of `slot`, one of the best practice to generate the value of a slot is utilizing the `keccak256` algorithm to calculate the hash value of multi properties. In this scenario, the `properties` field should contain all the properties that are used to calculate the value of `slot`, and if a property is used in the calculation, is_intrinsic must be TRUE."
          },
          "order": {
            "type": "integer",
            "description": "Optional, related to the value of is_intrinsic. If is_intrinsic is TRUE, it must be the order of this property appeared in the calculation method of the slot."
          },
          "display_type": {
            "type": "string",
            "description": "Optional. Specifies in what form this property should be displayed."
          }
        }
      }
    }
  }
}

This is the “EIP-3525 Metadata JSON Schema for tokenURI(uint)” referenced above.

{
  "title": "Token Metadata",
  "type": "object",
  "properties": {
    "name": {
      "type": "string",
      "description": "Identifies the asset to which this token represents"
    },
    "description": {
      "type": "string",
      "description": "Describes the asset to which this token represents"
    },
    "image": {
      "type": "string",
      "description": "Either a base64 encoded imgae data or a URI pointing to a resource with mime type image/* representing the asset to which this token represents."
    },
    "balance": {
      "type": "integer",
      "description": "THe value held by this token."
    },
    "slot": {
      "type": "integer",
      "description": "The id of the slot that this token belongs to."
    },
    "properties": {
      "type": "object",
      "description": "Arbitrary properties. Values may be strings, numbers, objects or arrays. Optional, you can use the same schema as the properties section of EIP-3525 Metadata JSON Schema for slotURI(uint) if you need a better description attribute."
    }
  }
}

Acceptance Criteria

• Implement the contents of each functions and events
• Implement unit tests for each functions
• Implement integration tests for each functions
• If needed, write the documentation associated with the functions and events exposed