Enum DTGCredentialError 

pub enum DTGCredentialError {
    UnknownCredential,
    DataIntegrity(DataIntegrityError),
    NotSigned,
    UnknownVCVersion,
    EmptyAuthorityActions,
    NotAnAuthorityCredential,
    AttenuationParentHasNoId,
    InvalidDigest(String),
    UnsupportedDigestAlgorithm(u64),
    MalformedDelegation(String),
    NotADelegationGrant(String),
    AttenuationWidens(String),
    MissingTaskContext,
    Canonicalization(String),
    WrongCredentialType {
        expected: String,
        got: String,
    },
    NotAMembershipGrant(String),
}

Errors related to DTG Credentials

Variants

UnknownCredential

DataIntegrity(DataIntegrityError)

NotSigned

UnknownVCVersion

EmptyAuthorityActions

An AuthorityCredential (VAC) carried an empty actions list.

Emptiness is never a wildcard: a VAC conferring no actions confers nothing, and is rejected rather than treated as unrestricted.

NotAnAuthorityCredential

DTGCredential::attenuate was called on a credential that is not a VAC.

AttenuationParentHasNoId

👎Deprecated since 0.7.0:

Never returned. authority.parent is a digest as of Working Draft 02, so a parent VAC no longer needs an id to be attenuated. This variant will be removed in a future release.

DTGCredential::attenuate was called on a VAC with no id.

No longer produced. Working Draft 02 makes authority.parent a digest of the parent rather than its id, precisely so that no credential needs a top-level identifier merely in order to be referenced.

InvalidDigest(String)

A digest value was not a well-formed digestMultibase.

Either the multibase envelope or the multihash inside it failed to decode. A sha256:<hex> value produced against Working Draft 01 lands here, which is the intended outcome: it is reported rather than silently compared as unequal.

UnsupportedDigestAlgorithm(u64)

A digest named a hash algorithm this library does not implement.

The specification permits a governing party to require a stronger hash, and carries the algorithm in the value itself. A verifier MUST reject an algorithm it does not accept rather than treating it as a mismatch — hence a distinct error.

MalformedDelegation(String)

A DelegationCredential (VDC) was not a well-formed grant or acceptance.

NotADelegationGrant(String)

A delegation acknowledgement was built against something that is not a delegation grant.

AttenuationWidens(String)

An attenuation attempted to confer more than its parent held.

MissingTaskContext

A WitnessCredential (VWC) was missing the REQUIRED taskContext property

Canonicalization(String)

The credential could not be canonicalized (JCS, RFC 8785) for digesting

WrongCredentialType

A credential was not of the type an operation requires

Fields

expected: String

got: String

NotAMembershipGrant(String)

A membership acknowledgement was built against something that is not a community-issued membership grant

Trait Implementations

impl Debug for DTGCredentialError

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Display for DTGCredentialError

fn fmt(&self, __formatter: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Error for DTGCredentialError

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.

impl From<DataIntegrityError> for DTGCredentialError

fn from(source: DataIntegrityError) -> Self

Converts to this type from the input type.