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    mttp_digest

    Origin-scoped Digest authentication for gaato/mttp.

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    Version
    0.1.0
    License
    Apache-2.0
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    10 hours ago
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    #gaato/mttp_digest

    Origin-scoped HTTP Digest authentication for gaato/http backends and the gaato/mttp client. Keeping it in a separate module makes the moonbitlang/x crypto dependency optional for other clients.

    #Install

    moon add gaato/http gaato/mttp gaato/mttp_digest

    #Usage

    ///|
    test {
      let inner = @client.from_fn((_, _) => @http.Response::new(200))
      let backend = @mttp_digest.DigestScheme::new(
        inner,
        "user",
        "password",
        origin="https://api.example.test",
        random=() => 0.5, // deterministic test source; inject secure randomness in production
      )
      @driver.run_sync(() => {
        let response = backend.send(
          @http.Request::get("https://api.example.test/"),
          @http.SendOptions::default(),
        )
        assert_eq(response.status, 200)
        response.close()
      })
      backend.close()
    }

    Inject an unpredictable source of values in [0, 1) in production. Each cnonce uses four draws (128 bits); the nonce count starts at one and is sent as eight hex digits. Concurrent calls share increasing counts, including responses to challenges with an already-used nonce. A new nonce or a stale=true challenge resets the count to one. The origin must be an absolute HTTP(S) URL without userinfo. Paths do not affect its scope. Explicit Authorization headers take precedence; requests to another origin pass through without credentials.

    Place DigestScheme inside FollowRedirects so every hop is checked against the credential origin, and put the Client outside both wrappers. Retry policies then see the outcome of the whole exchange. A failure after an answered 401 has phase Unknown, with Connect/Proxy mapped to Network, so an unsent-only retry rule cannot repeat an already answered POST. The original error remains in the detail.

    The wrapper answers one challenge and, if necessary, one further stale=true challenge. It closes intermediate responses unread and keeps the final body owned by the caller. It passes SendOptions through unchanged on every send; a Client with a Timer bounds the whole exchange. Request streams close on every exit, including validation refusal and cancellation, and are never replayed to answer a challenge. Empty and byte bodies can be resent. Close is idempotent and clears retained nonces.

    Supported algorithms are MD5, SHA-256 and their -sess forms, with auth preferred over auth-int (the latter requires a buffered body), userhash and UTF-8 username*. Legacy non-session challenges without qop are also accepted, without preemptive nonce reuse. -sess without qop and SHA-512-256 challenges are declined, as in the original implementation: moonbitlang/x does not provide SHA-512/256's distinct initialization values.

    All WWW-Authenticate values together have a 16 KiB UTF-8 budget; a larger challenge returns the 401 unchanged. The nonce store retains at most 16 origins, evicts the oldest on overflow and forgets a nonce when its count would exceed ffffffff. A same-nonce challenge at exhaustion returns the 401 unchanged rather than reusing a count. Each wrapper is scoped to one origin.

    #License

    Apache-2.0. See LICENSE.

    DigestScheme

    source
    pub struct DigestScheme {
      // private fields
    }

    Digest credentials scoped to one HTTP(S) origin, wrapping a Backend. Put this inside FollowRedirects so credentials are checked on every hop.

    DigestScheme::close

    source
    fn DigestScheme::close(self : DigestScheme) -> Unit

    Closes the inner backend once and forgets retained nonces.

    DigestScheme::new

    source
    fn DigestScheme::new(inner : &
    Backend    , username : String, password : String, origin~ : String, random~ : () -> Double) -> DigestScheme raise 
    TransportError

    Creates an origin-scoped wrapper. The origin must be an absolute HTTP(S) URL without userinfo. Paths are ignored. Supply an unpredictable random source returning values in [0,1) for cnonces; tests can inject fixed values. No network I/O occurs here. Explicit request Authorization takes precedence.

    DigestScheme::send

    source

    Sends one exchange, answering at most one challenge and one stale nonce. Intermediate response bodies close before resending. Stream bodies are never replayed. Requests outside the configured origin pass through. SendOptions pass through unchanged to every send. A Client with a Timer can bound the whole challenge exchange. After a 401 was answered, a transport failure has phase Unknown; Connect and Proxy become Network, and the detail retains the original failure, so it cannot appear unsent.

    Source Files