exochain-consent 0.2.0-beta

EXOCHAIN bailment-conditioned consent enforcement — no action without consent
Documentation 
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// Copyright 2026 Exochain Foundation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at:
//
//     https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// SPDX-License-Identifier: Apache-2.0

//! Consent-specific error types.

use thiserror::Error;

/// Errors arising from consent operations.
#[derive(Debug, Error, PartialEq, Eq, Clone)]
pub enum ConsentError {
    #[error("invalid bailment state: expected {expected}, got {actual}")]
    InvalidState { expected: String, actual: String },

    #[error("unauthorized: {0}")]
    Unauthorized(String),

    #[error("expired: {0}")]
    Expired(String),

    #[error("no consent found for action: {0}")]
    NoConsent(String),

    #[error("invalid signature")]
    InvalidSignature,

    #[error("consent denied: {0}")]
    Denied(String),

    #[error("bailment has been revoked: {bailment_id}")]
    Revoked { bailment_id: String },

    #[error("consent audit sequence overflow for {counter}")]
    SequenceOverflow { counter: String },

    #[error("serialization error: {0}")]
    Serialization(String),
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn error_display_invalid_state() {
        let e = ConsentError::InvalidState {
            expected: "Active".into(),
            actual: "Proposed".into(),
        };
        assert!(e.to_string().contains("Active"));
        assert!(e.to_string().contains("Proposed"));
    }

    #[test]
    fn error_display_unauthorized() {
        let e = ConsentError::Unauthorized("bad actor".into());
        assert!(e.to_string().contains("bad actor"));
    }

    #[test]
    fn error_display_expired() {
        let e = ConsentError::Expired("ts 1000".into());
        assert!(e.to_string().contains("ts 1000"));
    }

    #[test]
    fn error_display_no_consent() {
        let e = ConsentError::NoConsent("read".into());
        assert!(e.to_string().contains("read"));
    }

    #[test]
    fn error_display_invalid_signature() {
        let e = ConsentError::InvalidSignature;
        assert!(e.to_string().contains("invalid signature"));
    }

    #[test]
    fn error_display_denied() {
        let e = ConsentError::Denied("policy says no".into());
        assert!(e.to_string().contains("policy says no"));
    }

    #[test]
    fn error_clone_eq() {
        let e1 = ConsentError::InvalidSignature;
        let e2 = e1.clone();
        assert_eq!(e1, e2);
    }
}