Query a single attribute
Use the
getAttributes()
function from the QuadReader smart contract to query a single attribute about a passport holder.Install @quadrata/contracts package
npm i @quadrata/contracts --save-dev
Calling smart contract have to be granted permissions to call
getAttributes
in Mainnet.
Contact us via email at [email protected] or DiscordTestnets like Goerli,Mumbai,etc.. do not require any permissions
QuadReader.sol
import "@quadrata/contracts/interfaces/IQuadPassportStore.sol";
// For Solidity version >= 0.8.0.
reader.getAttributes(
address user,
bytes32 attribute
) external payable returns(
IQuadPassportStore.Attribute[] memory attributes
);
// For Solidity version < 0.8.0.
reader.getAttributesLegacy(
address user,
bytes32 attribute
) external payable returns(
bytes32[] attributeValues,
uint256[] epochs,
address[] issuers
);
Parameter | Description | Type |
---|---|---|
user | address of the passport holder | address (required) |
attribute | bytes32 (required) |
A list of attributes that have been issued.
IQuadPassportStore.sol
/// @dev Attribute store infomation as it relates to a single attribute
/// `attrKeys` Array of keys defined by (wallet address/DID + data Type)
/// `value` Attribute value
/// `epoch` timestamp when the attribute has been verified by an Issuer
/// `issuer` address of the issuer issuing the attribute
struct Attribute {
bytes32 value;
uint256 epoch;
address issuer;
}
For Solidity version < 0.8.0
Use
getAttributesLegacy()
which
returns three arrays. The index of each array maps to the others to create a tuple (e.g. attributeValues[0]
, epochs[0]
, issuers[0]
are part of the same result). - attributeValues: Raw or hashed attribute values. See Supported attributes for the return values of each attribute.
- epochs: Timestamp that indicates when the attribute was verified by the passport issuer.
- issuers: Passport issuer who verified the attributes.
import "@quadrata/contracts/interfaces/IQuadReader.sol";
import "@quadrata/contracts/interfaces/IQuadPassportStore.sol";
import "@quadrata/contracts/utility/QuadReaderUtils.sol";
contract MyDapp {
using QuadReaderUtils for bytes32;
IQuadReader public reader;
function borrowMoney() external payable {
IQuadPassportStore.Attribute[] memory attributes = reader.getAttributes(
msg.sender,
keccak256("COUNTRY")
);
require(attributes.length > 0, "REQUIRES_COUNTRY");
// only users residing outside the US may borrow money
if (!attributes[0].value.countryIsEqual("US")) {
// Allow borrow actions
}
}
Last modified 7mo ago