jacs 0.9.12

JACS JSON AI Communication Standard
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129

use crate::agent::Agent;
use crate::agent::DOCUMENT_AGENT_SIGNATURE_FIELDNAME;
use crate::agent::document::DocumentTraits;
use crate::error::JacsError;
use crate::replay;
use chrono;
use serde_json::Value;
// use crate::agent::{AGENT_REGISTRATION_SIGNATURE_FIELDNAME, AGENT_SIGNATURE_FIELDNAME, Agent};
// use crate::crypt::KeyManager;
// use crate::crypt::hash::hash_string as jacs_hash_string;

/*
Payloads are data that is designed sent and received once.
There should be no versions of a payload

*/

pub trait PayloadTraits {
    fn sign_payload(&mut self, document: Value) -> Result<String, JacsError>;

    fn verify_payload(
        &mut self,
        document_string: String,
        max_replay_time_delta: Option<u64>,
    ) -> Result<Value, JacsError>;

    fn verify_payload_with_agent_id(
        &mut self,
        document_string: String,
        max_replay_time_delta: Option<u64>,
    ) -> Result<(Value, String), JacsError>;
}

impl PayloadTraits for Agent {
    fn sign_payload(&mut self, jacs_payload: Value) -> Result<String, JacsError> {
        let wrapper_value = serde_json::json!({
            "jacs_payload": jacs_payload
        });

        let wrapper_string = serde_json::to_string(&wrapper_value)?;

        let outputfilename: Option<String> = None;
        let attachments: Option<String> = None;
        let no_save = true;
        let docresult = crate::shared::document_create(
            self,
            &wrapper_string,
            None,
            outputfilename,
            no_save,
            attachments.as_deref(),
            Some(false),
        )?;

        Ok(docresult)
    }

    fn verify_payload(
        &mut self,
        document_string: String,
        max_replay_time_delta: Option<u64>,
    ) -> Result<Value, JacsError> {
        let (payload, _) =
            self.verify_payload_with_agent_id(document_string, max_replay_time_delta)?;
        Ok(payload.clone())
    }

    fn verify_payload_with_agent_id(
        &mut self,
        document_string: String,
        max_replay_time_delta_seconds: Option<u64>,
    ) -> Result<(Value, String), JacsError> {
        let doc = self.load_document(&document_string)?;
        let document_key = doc.getkey();
        let value = doc.getvalue();
        self.verify_hash(value)?;
        self.verify_external_document_signature(&document_key)?;

        let payload = value
            .get("jacs_payload")
            .ok_or_else(|| JacsError::Internal {
                message: "'jacs_payload' field not found".to_string(),
            })?;
        let date = self.get_document_signature_date(&document_key)?;
        let agent_id = self.get_document_signature_agent_id(&document_key)?;

        // Default payload freshness window: 5 minutes.
        // Can be overridden per call, or globally with JACS_PAYLOAD_MAX_REPLAY_SECONDS.
        let max_replay_seconds =
            max_replay_time_delta_seconds.unwrap_or_else(replay::payload_replay_window_seconds);
        let current_time = std::time::SystemTime::now()
            .duration_since(std::time::UNIX_EPOCH)
            .map_err(|e| JacsError::Internal {
                message: e.to_string(),
            })?
            .as_secs();

        // Parse ISO date string to timestamp
        let date_timestamp = chrono::DateTime::parse_from_rfc3339(&date)
            .map_err(|e| JacsError::Internal {
                message: e.to_string(),
            })?
            .timestamp() as u64;

        // Check if signature is too old
        if current_time > date_timestamp && current_time - date_timestamp > max_replay_seconds {
            return Err(JacsError::Internal {
                message: format!(
                    "Signature too old: {} seconds (max allowed: {})",
                    current_time - date_timestamp,
                    max_replay_seconds
                ),
            });
        }

        let jti = value
            .get(DOCUMENT_AGENT_SIGNATURE_FIELDNAME)
            .and_then(|sig| sig.get("jti"))
            .and_then(Value::as_str)
            .map(str::trim)
            .filter(|nonce| !nonce.is_empty())
            .ok_or_else(|| JacsError::Internal {
                message: "Missing or invalid 'jacsSignature.jti' in payload document".to_string(),
            })?;
        replay::check_and_store_nonce(&agent_id, jti)?;

        Ok((payload.clone(), agent_id))
    }
}