s2pa 0.1.0

Simple Standard for Provenance and Authenticity — the C2PA SDK plus secp256k1 (ES256K) signing, bare CMAF (.m4s) support, and DID-based identity.
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// Copyright 2025 Adobe. All rights reserved.
// This file is licensed to you under the Apache License,
// Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
// or the MIT license (http://opensource.org/licenses/MIT),
// at your option.

// Unless required by applicable law or agreed to in writing,
// this software is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR REPRESENTATIONS OF ANY KIND, either express or
// implied. See the LICENSE-MIT and LICENSE-APACHE files for the
// specific language governing permissions and limitations under
// each license.

use std::collections::HashMap;

use serde::{Deserialize, Serialize};
use serde_bytes::ByteBuf;

use crate::{
    assertion::{Assertion, AssertionBase, AssertionCbor},
    assertions::labels,
    error::Result,
};

/// Helper class to create Timestamp assertions
#[derive(Serialize, Deserialize, Default, Debug, PartialEq, Eq)]
pub struct TimeStamp(HashMap<String, ByteBuf>);

#[allow(dead_code)]
impl TimeStamp {
    /// Label prefix for an [`Actions`] assertion.
    ///
    /// See <https://c2pa.org/specifications/specifications/2.2/specs/C2PA_Specification.html#_actions>.
    pub const LABEL: &'static str = labels::TIMESTAMP;

    pub fn new(label: &str, timestamp: &[u8]) -> Self {
        let mut ts = TimeStamp(HashMap::new());
        ts.0.insert(label.to_string(), ByteBuf::from(timestamp.to_vec()));
        ts
    }

    //
    pub fn add_timestamp(&mut self, manifest_id: &str, timestamp: &[u8]) {
        self.0
            .insert(manifest_id.to_string(), ByteBuf::from(timestamp.to_vec()));
    }

    /// Get the timestamp for a given manifest id
    pub fn get_timestamp(&self, manifest_id: &str) -> Option<&[u8]> {
        self.0.get(manifest_id).map(|buf| buf.as_ref())
    }
}

impl AsRef<HashMap<String, ByteBuf>> for TimeStamp {
    fn as_ref(&self) -> &HashMap<String, ByteBuf> {
        &self.0
    }
}

impl AssertionCbor for TimeStamp {}

impl AssertionBase for TimeStamp {
    const LABEL: &'static str = Self::LABEL;

    fn to_assertion(&self) -> Result<Assertion> {
        Self::to_cbor_assertion(self)
    }

    fn from_assertion(assertion: &Assertion) -> Result<Self> {
        Self::from_cbor_assertion(assertion)
    }
}