trust-tasks-https 0.11.0

HTTPS transport binding for the Trust Tasks framework — typed client + axum-based server with bearer-auth identity, suitable for demos, mockups, and end-to-end testing.
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
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144

//! Mapping from framework error codes to HTTP status codes.
//!
//! The mapping is informative — SPEC.md leaves transport-level signalling
//! to the binding. The authority for this table is the HTTPS binding
//! specification's §4 status mapping (`bindings/https/0.2/spec.md`); a
//! client that cannot or does not want to parse the body can still
//! classify the response broadly.
//!
//! | Standard code        | HTTP status |
//! |----------------------|-------------|
//! | `malformedRequest`   | 400 Bad Request |
//! | `permissionDenied`   | 403 Forbidden |
//! | `unsupportedType`    | 422 Unprocessable Entity |
//! | `unsupportedVersion` | 422 Unprocessable Entity |
//! | `expired`            | 422 Unprocessable Entity |
//! | `proofRequired`      | 422 Unprocessable Entity |
//! | `proofInvalid`       | 422 Unprocessable Entity |
//! | `identityMismatch`   | 422 Unprocessable Entity |
//! | `wrongRecipient`     | 422 Unprocessable Entity |
//! | `cancelled`          | 422 Unprocessable Entity |
//! | `taskFailed`         | 422 Unprocessable Entity |
//! | `unavailable`        | 503 Service Unavailable |
//! | `internalError`      | 500 Internal Server Error |
//!
//! `idConflict` has no row in the binding's table and keeps this crate's
//! **409 Conflict**, which is what the code means at the HTTP layer.
//!
//! The flatness of the 422 bucket is the point, not an oversight. An
//! earlier version of this table split `proofRequired` / `proofInvalid`
//! into 401 and `permissionDenied` / `wrongRecipient` / `identityMismatch`
//! into 403 — which handed an unauthenticated prober a status-code oracle
//! distinguishing "your proof is bad" from "you are not who you said" from
//! "this is not addressed to me", without ever reading a body. Collapsing
//! them to one status removes that signal; the framework error code in the
//! body remains available to a legitimate producer, which is the party
//! entitled to it. `permissionDenied` keeps 403 because the binding's table
//! says so: it is the one outcome that reports on the *authenticated*
//! caller's authorization, and so tells an unauthenticated prober nothing.
//!
//! Extension codes (`<slug>:<local>`) default to **422 Unprocessable
//! Entity** since they are spec-defined application-layer failures.

use trust_tasks_rs::{StandardCode, TrustTaskCode};

/// Map a [`TrustTaskCode`] to a numeric HTTP status code.
///
/// Returns `u16` rather than `http::StatusCode` so the function is
/// dependency-light and usable from both the server (axum) and client
/// (reqwest) sides without dragging in extra crates here.
pub fn status_for_code(code: &TrustTaskCode) -> u16 {
    match code {
        TrustTaskCode::Standard(c) => standard_status(*c),
        TrustTaskCode::Extended { .. } => 422,
    }
}

fn standard_status(code: StandardCode) -> u16 {
    match code {
        StandardCode::MalformedRequest => 400,
        StandardCode::PermissionDenied => 403,
        StandardCode::IdConflict => 409,
        // The flat 422 bucket of the binding spec's §4 table. Everything
        // here is "understood, well-formed, and refused"; keeping them
        // indistinguishable at the status line is deliberate — see the
        // module docs for the oracle the finer split created.
        StandardCode::UnsupportedType
        | StandardCode::UnsupportedVersion
        | StandardCode::Expired
        | StandardCode::ProofRequired
        | StandardCode::ProofInvalid
        | StandardCode::WrongRecipient
        | StandardCode::IdentityMismatch
        | StandardCode::Cancelled
        | StandardCode::TaskFailed => 422,
        StandardCode::Unavailable => 503,
        StandardCode::InternalError => 500,
        // `StandardCode` is `#[non_exhaustive]` (trust-tasks-rs 0.7.0): a
        // framework revision can add a code without breaking this crate. An
        // unmapped code is a server-side failure to keep up, not a client
        // error, so it maps to 500 rather than being silently bucketed as 400.
        _ => 500,
    }
}

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

    /// REGRESSION: the table must match `bindings/https/0.2/spec.md` §4.
    /// Before this was fixed, `proofRequired`/`proofInvalid` mapped to 401,
    /// `permissionDenied`/`wrongRecipient`/`identityMismatch` to 403, and
    /// `unsupportedType`/`unsupportedVersion`/`expired` to 400 — three rows
    /// of drift from the binding, and a status-code identity oracle.
    #[test]
    fn standard_codes_map_to_binding_spec_statuses() {
        assert_eq!(status_for_code(&StandardCode::MalformedRequest.into()), 400);
        assert_eq!(status_for_code(&StandardCode::PermissionDenied.into()), 403);
        assert_eq!(status_for_code(&StandardCode::IdConflict.into()), 409);
        assert_eq!(status_for_code(&StandardCode::UnsupportedType.into()), 422);
        assert_eq!(
            status_for_code(&StandardCode::UnsupportedVersion.into()),
            422
        );
        assert_eq!(status_for_code(&StandardCode::Expired.into()), 422);
        assert_eq!(status_for_code(&StandardCode::ProofRequired.into()), 422);
        assert_eq!(status_for_code(&StandardCode::ProofInvalid.into()), 422);
        assert_eq!(status_for_code(&StandardCode::WrongRecipient.into()), 422);
        assert_eq!(status_for_code(&StandardCode::IdentityMismatch.into()), 422);
        assert_eq!(status_for_code(&StandardCode::Cancelled.into()), 422);
        assert_eq!(status_for_code(&StandardCode::TaskFailed.into()), 422);
        assert_eq!(status_for_code(&StandardCode::Unavailable.into()), 503);
        assert_eq!(status_for_code(&StandardCode::InternalError.into()), 500);
    }

    /// REGRESSION: the codes that report on identity or attribution must be
    /// indistinguishable at the status line. Asserted as a set property so a
    /// future edit that re-splits one of them out fails here, not only in
    /// the per-code table above.
    #[test]
    fn identity_related_codes_share_one_status() {
        let identity_codes = [
            StandardCode::ProofRequired,
            StandardCode::ProofInvalid,
            StandardCode::IdentityMismatch,
            StandardCode::WrongRecipient,
        ];
        for code in identity_codes {
            assert_eq!(
                status_for_code(&code.into()),
                422,
                "{code:?} must not be distinguishable by status code"
            );
        }
    }

    #[test]
    fn extension_codes_default_to_422() {
        let code = TrustTaskCode::Extended {
            slug: "acl/grant".into(),
            local: "lastAuthorityProtected".into(),
        };
        assert_eq!(status_for_code(&code), 422);
    }
}