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namespace NpgsqlRestTests.CorsTests;

/// <summary>

/// Integration tests for CORS (Cross-Origin Resource Sharing) configuration.

/// These tests verify that:

/// - Preflight OPTIONS requests return correct CORS headers

/// - AllowedOrigins configuration restricts correctly

/// - AllowCredentials header is present when configured

/// - Methods/Headers filtering works as expected

/// </summary>

[Collection("CorsTestFixture")]

public class CorsTests(CorsTestFixture test)

{

/// <summary>

/// Test that preflight OPTIONS request returns correct CORS headers for allowed origin.

/// </summary>

[Fact]

public async Task Preflight_Request_Should_Return_Cors_Headers_For_Allowed_Origin()

{

// Arrange

var request = new HttpRequestMessage(HttpMethod.Options, "/api/hello-world/");

request.Headers.Add("Origin", CorsTestFixture.AllowedOrigin);

request.Headers.Add("Access-Control-Request-Method", "POST");

request.Headers.Add("Access-Control-Request-Headers", "Content-Type");

// Act

using var response = await test.Client.SendAsync(request);

// Assert - Preflight should return 204 No Content or 200 OK

response.StatusCode.Should().BeOneOf(HttpStatusCode.NoContent, HttpStatusCode.OK);

// Verify CORS headers

response.Headers.TryGetValues("Access-Control-Allow-Origin", out var allowOriginValues);

allowOriginValues.Should().NotBeNull();

allowOriginValues!.Should().Contain(CorsTestFixture.AllowedOrigin,

"Access-Control-Allow-Origin should match the allowed origin");

response.Headers.TryGetValues("Access-Control-Allow-Credentials", out var allowCredentialsValues);

allowCredentialsValues.Should().NotBeNull();

allowCredentialsValues!.Should().Contain("true",

"Access-Control-Allow-Credentials should be true when configured");

}

/// <summary>

/// Test that preflight request does not return CORS headers for disallowed origin.

/// </summary>

[Fact]

public async Task Preflight_Request_Should_Not_Return_Cors_Headers_For_Disallowed_Origin()

{

// Arrange

var request = new HttpRequestMessage(HttpMethod.Options, "/api/hello-world/");

request.Headers.Add("Origin", CorsTestFixture.DisallowedOrigin);

request.Headers.Add("Access-Control-Request-Method", "POST");

// Act

using var response = await test.Client.SendAsync(request);

// Assert - Should not have Access-Control-Allow-Origin for disallowed origin

response.Headers.TryGetValues("Access-Control-Allow-Origin", out var allowOriginValues);

if (allowOriginValues != null)

{

allowOriginValues.Should().NotContain(CorsTestFixture.DisallowedOrigin,

"Disallowed origin should not be in Access-Control-Allow-Origin");

}

/// <summary>

/// Test that actual request returns CORS headers for allowed origin.

/// Uses hello-world-html endpoint from the test database.

/// </summary>

[Fact]

public async Task Actual_Request_Should_Return_Cors_Headers_For_Allowed_Origin()

{

// Arrange - use an endpoint that actually exists in the test database

var request = new HttpRequestMessage(HttpMethod.Get, "/api/hello-world-html/");

request.Headers.Add("Origin", CorsTestFixture.AllowedOrigin);

// Act

using var response = await test.Client.SendAsync(request);

// Assert - even if endpoint returns error, CORS headers should be present

response.Headers.TryGetValues("Access-Control-Allow-Origin", out var allowOriginValues);

allowOriginValues.Should().NotBeNull(

"CORS headers should be present on responses when Origin header is sent");

allowOriginValues!.Should().Contain(CorsTestFixture.AllowedOrigin);

}

/// <summary>

/// Test that Access-Control-Allow-Methods header contains configured methods.

/// </summary>

[Fact]

public async Task Preflight_Should_Return_Allowed_Methods()

{

// Arrange

var request = new HttpRequestMessage(HttpMethod.Options, "/api/hello-world/");

request.Headers.Add("Origin", CorsTestFixture.AllowedOrigin);

request.Headers.Add("Access-Control-Request-Method", "PUT");

// Act

using var response = await test.Client.SendAsync(request);

// Assert

response.Headers.TryGetValues("Access-Control-Allow-Methods", out var allowMethodsValues);

allowMethodsValues.Should().NotBeNull();

var methods = string.Join(",", allowMethodsValues!);

methods.Should().ContainAny("GET", "POST", "PUT", "DELETE",

"Access-Control-Allow-Methods should contain configured methods");

}

/// <summary>

/// Test that Access-Control-Allow-Headers header contains configured headers.

/// </summary>

[Fact]

public async Task Preflight_Should_Return_Allowed_Headers()

{

// Arrange

var request = new HttpRequestMessage(HttpMethod.Options, "/api/hello-world/");

request.Headers.Add("Origin", CorsTestFixture.AllowedOrigin);

request.Headers.Add("Access-Control-Request-Method", "POST");

request.Headers.Add("Access-Control-Request-Headers", "Content-Type, X-Custom-Header");

// Act

using var response = await test.Client.SendAsync(request);

// Assert

response.Headers.TryGetValues("Access-Control-Allow-Headers", out var allowHeadersValues);

allowHeadersValues.Should().NotBeNull();

var headers = string.Join(",", allowHeadersValues!).ToLowerInvariant();

headers.Should().Contain("content-type",

"Access-Control-Allow-Headers should contain Content-Type");

}

/// <summary>

/// Test that Access-Control-Max-Age header is present for preflight caching.

/// </summary>

[Fact]

public async Task Preflight_Should_Return_Max_Age_Header()

{

// Arrange

var request = new HttpRequestMessage(HttpMethod.Options, "/api/hello-world/");

request.Headers.Add("Origin", CorsTestFixture.AllowedOrigin);

request.Headers.Add("Access-Control-Request-Method", "POST");

// Act

using var response = await test.Client.SendAsync(request);

// Assert

response.Headers.TryGetValues("Access-Control-Max-Age", out var maxAgeValues);

maxAgeValues.Should().NotBeNull(

"Access-Control-Max-Age should be present for preflight caching");

if (int.TryParse(maxAgeValues!.First(), out var maxAge))

{

maxAge.Should().BeGreaterThan(0,

"Access-Control-Max-Age should be a positive number");

}

/// <summary>

/// Test that request without Origin header doesn't return CORS headers.

/// </summary>

[Fact]

public async Task Request_Without_Origin_Should_Not_Return_Cors_Headers()

{

// Arrange - no Origin header, use an existing endpoint

var request = new HttpRequestMessage(HttpMethod.Get, "/api/hello-world-html/");

// Act

using var response = await test.Client.SendAsync(request);

// Assert - without Origin, no CORS headers should be returned

response.Headers.TryGetValues("Access-Control-Allow-Origin", out var allowOriginValues);

allowOriginValues.Should().BeNull(

"Access-Control-Allow-Origin should not be present without Origin request header");

}

/// <summary>

/// Test that preflight for disallowed method is rejected.

/// </summary>

[Fact]

public async Task Preflight_For_Disallowed_Method_Should_Not_Allow()

{

// Arrange - PATCH is not in our allowed methods list

var request = new HttpRequestMessage(HttpMethod.Options, "/api/hello-world/");

request.Headers.Add("Origin", CorsTestFixture.AllowedOrigin);

request.Headers.Add("Access-Control-Request-Method", "PATCH");

// Act

using var response = await test.Client.SendAsync(request);

// Assert - Either no CORS headers or PATCH not in allowed methods

response.Headers.TryGetValues("Access-Control-Allow-Methods", out var allowMethodsValues);

if (allowMethodsValues != null)

{

var methods = string.Join(",", allowMethodsValues).ToUpperInvariant();

methods.Should().NotContain("PATCH",

"PATCH should not be in allowed methods when not configured");

}

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