praxis-proxy-protocol 0.7.3

HTTP, TCP, and protocol adapters for Praxis
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// SPDX-License-Identifier: Apache-2.0
// Copyright (c) 2024 Praxis Contributors

//! Utility for building JSON HTTP responses.

use http::Response;

// -----------------------------------------------------------------------------
// JSON
// -----------------------------------------------------------------------------

/// Build an HTTP response with `Content-Type: application/json` and a
/// matching `Content-Length`.
#[expect(clippy::expect_used, reason = "valid static response")]
pub(crate) fn json_response(status: u16, body: &[u8]) -> Response<Vec<u8>> {
    Response::builder()
        .status(status)
        .header("Content-Type", "application/json")
        .header("Content-Length", body.len())
        .body(body.to_vec())
        .expect("valid json response")
}

// -----------------------------------------------------------------------------
// Tests
// -----------------------------------------------------------------------------

#[cfg(test)]
#[expect(clippy::allow_attributes, reason = "blanket test suppressions")]
#[allow(clippy::unwrap_used, reason = "tests")]
mod tests {
    use super::*;

    #[test]
    fn sets_status_code() {
        let resp = json_response(200, b"{}");
        assert_eq!(resp.status().as_u16(), 200, "status should be 200");
    }

    #[test]
    fn sets_body() {
        let body = b"{\"key\":\"value\"}";
        let resp = json_response(200, body);
        assert_eq!(resp.body(), body, "body content mismatch");
    }

    #[test]
    fn sets_content_type_header() {
        let resp = json_response(200, b"{}");
        assert_eq!(
            resp.headers().get("Content-Type").map(|v| v.to_str().unwrap()),
            Some("application/json"),
            "Content-Type header should be application/json"
        );
    }

    #[test]
    fn sets_content_length_header() {
        let body = b"{\"ok\":true}";
        let resp = json_response(200, body);
        assert_eq!(
            resp.headers().get("Content-Length").map(|v| v.to_str().unwrap()),
            Some("11"),
            "Content-Length should match body length"
        );
    }
}