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feat!: use 'text/plain' content type for /send endpoint + reworked validation + renamed signalr method

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This commit is contained in:
Eugene Fox
2025-12-11 01:21:59 +00:00
parent a27400928a
commit 23f2d7ccb1
3 changed files with 98 additions and 24 deletions
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Program.cs
+25 -22
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@@ -1,5 +1,5 @@
using System.Reflection;
using System.Text.Json.Serialization;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.SignalR;
@@ -10,14 +10,6 @@ using Microsoft.AspNetCore.SignalR;
WebApplicationBuilder builder = WebApplication.CreateSlimBuilder(args);
builder.Services.AddSignalR();
builder.Services.ConfigureHttpJsonOptions(options =>
options.SerializerOptions.TypeInfoResolverChain.Insert(0, AppJsonSerializerContext.Default)
);
builder.Services.Configure<JsonHubProtocolOptions>(options =>
options.PayloadSerializerOptions.TypeInfoResolverChain.Insert(0, AppJsonSerializerContext.Default)
);
builder.Services.AddCors(options =>
{
options.AddDefaultPolicy(policy =>
@@ -39,22 +31,36 @@ app.MapHub<WsHub>("/ws", options =>
app.MapPost("/send",
static async (
[FromServices] IHubContext<WsHub> hubContext, [FromServices] ILogger<Program> logger,
[FromQuery] string? id, [FromBody] string? data
[FromServices] IHubContext<WsHub> hubContext,
[FromServices] ILogger<Program> logger,
HttpContext context
) =>
{
if (string.IsNullOrWhiteSpace(id) || id.Length > 64)
return Results.BadRequest("Connection ID is required and must be at most 64 characters long.");
string? id = context.Request.Query["id"].FirstOrDefault();
// Id validation
if (string.IsNullOrEmpty(id) || id.Length > 32)
return Results.StatusCode(StatusCodes.Status400BadRequest);
foreach (char c in id)
if (!char.IsLetterOrDigit(c) && c != '-' && c != '_')
return Results.BadRequest("Connection ID contains invalid characters.");
if (!char.IsAsciiLetterOrDigit(c) && c is not ('-' or '_'))
return Results.StatusCode(StatusCodes.Status400BadRequest);
if (string.IsNullOrWhiteSpace(data) || data.Length > 66_560)
return Results.BadRequest("Body is required and must be at most 66,560 characters long.");
// Content validation
if (context.Request.ContentType is not "text/plain")
return Results.StatusCode(StatusCodes.Status415UnsupportedMediaType);
logger.LogDebug("Received payload for connection '{id}' (package length: {len})", id, data.Length);
await hubContext.Clients.Client(id).SendAsync("ReceiveData", data);
if (context.Request.ContentLength is < 1 or > 66_560)
return Results.StatusCode(StatusCodes.Status400BadRequest);
// Sending data
if (logger.IsEnabled(LogLevel.Debug))
logger.LogDebug("Received payload for connection '{id}' (package length: {len} B)", id, context.Request.ContentLength);
using StreamReader reader = new(context.Request.Body);
string? data = await reader.ReadToEndAsync();
await hubContext.Clients.Client(id).SendAsync("OnMessage", data);
return Results.Ok();
}
@@ -63,6 +69,3 @@ app.MapPost("/send",
app.Run();
class WsHub : Hub { }
[JsonSerializable(typeof(string))]
internal partial class AppJsonSerializerContext : JsonSerializerContext { }