WebJobs.Extensions.HttpApi 3.0.0-preview1

HTTP API Extensions for Azure Functions

Features

• Better route precedence
• Model validation
• ASP.NET Core like helpers
• Support URL generation
• Handle static files
• Simple reverse proxy
• Streamlined SPA / SSG hosting

Installation

Install-Package WebJobs.Extensions.HttpApi

dotnet add package WebJobs.Extensions.HttpApi

// Inherits from `HttpFunctionBase` class
public class Function1 : HttpFunctionBase
{
    public Function1(IHttpContextAccessor httpContextAccessor)
        : base(httpContextAccessor)
    {
    }

    [FunctionName("Function1")]
    public IActionResult Run(
        [HttpTrigger(AuthorizationLevel.Function, "get")] HttpRequest req,
        ILogger log)
    {
        return Ok($"Hello, {req.Query["name"]}");
    }
}

Examples

Model validation

public class Function1 : HttpFunctionBase
{
    public Function1(IHttpContextAccessor httpContextAccessor)
        : base(httpContextAccessor)
    {
    }

    [FunctionName("Function1")]
    public IActionResult Run(
        [HttpTrigger(AuthorizationLevel.Function, "post")]
        SampleModel model,
        ILogger log)
    {
        if (!TryValidateModel(model))
        {
            return BadRequest(ModelState);
        }

        return Ok(model);
    }
}

public class SampleModel
{
    [Required]
    public string Name { get; set; }

    public string[] Array { get; set; }

    [Range(100, 10000)]
    public int Price { get; set; }
}

ASP.NET Core like helpers

public class Function2 : HttpFunctionBase
{
    public Function2(IHttpContextAccessor httpContextAccessor)
        : base(httpContextAccessor)
    {
    }

    [FunctionName("Function2")]
    public IActionResult Run(
        [HttpTrigger(AuthorizationLevel.Function, "get")]
        HttpRequest req,
        ILogger log)
    {
        Response.Headers.Add("Cache-Control", "no-cache");

        return Ok($"Now: {DateTime.Now}");
    }
}

Support URL generation

public class Function3 : HttpFunctionBase
{
    public Function3(IHttpContextAccessor httpContextAccessor)
        : base(httpContextAccessor)
    {
    }

    [FunctionName("Function3")]
    public IActionResult Run(
        [HttpTrigger(AuthorizationLevel.Function, "get", Route = "route/{id}")]
        HttpRequest req,
        string id,
        ILogger log)
    {
        return CreatedAtFunction("Function3", new { id = "kazuakix" }, null);
    }
}

Handle static files

public class Function1 : HttpFunctionBase
{
    public Function1(IHttpContextAccessor httpContextAccessor)
        : base(httpContextAccessor)
    {
    }

    [FunctionName("Function1")]
    public IActionResult Run(
        [HttpTrigger(AuthorizationLevel.Anonymous, "get")] HttpRequest req,
        ILogger log)
    {
        return File("sample.html");
    }
}

Simple reverse proxy

public class Function1 : HttpFunctionBase
{
    public Function1(IHttpContextAccessor httpContextAccessor)
        : base(httpContextAccessor)
    {
    }

    [FunctionName("Function1")]
    public IActionResult Run(
        [HttpTrigger(AuthorizationLevel.Anonymous, "get", "post", Route = "{*path}"})] HttpRequest req,
        ILogger log)
    {
        return Proxy("https://example.com/{path}");
    }
}

Streamlined SPA / SSG hosting

public class Function1 : HttpFunctionBase
{
    public Function1(IHttpContextAccessor httpContextAccessor)
        : base(httpContextAccessor)
    {
    }

    [FunctionName("Function1")]
    public IActionResult Run(
        [HttpTrigger(AuthorizationLevel.Anonymous, "get", "post", Route = "{*path}"})] HttpRequest req,
        ILogger log)
    {
#if USE_REMOTE
        return RemoteStaticApp("https://example.com", fallbackExclude: $"^/_nuxt/.*");
#else
        return LocalStaticApp(fallbackPath: "404.html", fallbackExclude: $"^/_nuxt/.*");
#endif
    }
}

License

This project is licensed under the MIT License