WIP add API Key authentication

src/Robware.Api.Auth/ApiKey/ApiKeyAuthenticationHandler.cs

@@ -0,0 +1,65 @@
+using Microsoft.AspNetCore.Authentication;
+using Microsoft.Extensions.Logging;
+using Microsoft.Extensions.Options;
+using Robware.Auth.API;
+using System.Collections.Generic;
+using System.Linq;
+using System.Security.Claims;
+using System.Text.Encodings.Web;
+using System.Threading.Tasks;
+
+namespace Robware.Api.Auth.ApiKey {
+	public class ApiKeyAuthenticationHandler : AuthenticationHandler<ApiKeyAuthenticationOptions> {
+		private const string ApiKeyHeaderName = "X-Api-Key";
+		private readonly IApiKeyValidator _apiKeyValidator;
+		private readonly IApiKeys _apiKeys;
+
+		public ApiKeyAuthenticationHandler(
+			IOptionsMonitor<ApiKeyAuthenticationOptions> options,
+			ILoggerFactory logger,
+			UrlEncoder encoder,
+			ISystemClock clock,
+			IApiKeyValidator apiKeyValidator,
+			IApiKeys apiKeys) : base(options, logger, encoder, clock) {
+			_apiKeyValidator = apiKeyValidator;
+			_apiKeys = apiKeys;
+		}
+
+		protected override async Task<AuthenticateResult> HandleAuthenticateAsync() {
+			if (!Request.Headers.TryGetValue(ApiKeyHeaderName, out var apiKeyHeaderValues)) {
+				return AuthenticateResult.NoResult();
+			}
+
+			var providedApiKey = apiKeyHeaderValues.FirstOrDefault();
+
+			if (apiKeyHeaderValues.Count == 0 || string.IsNullOrWhiteSpace(providedApiKey)) {
+				return AuthenticateResult.NoResult();
+			}
+
+			if (await _apiKeyValidator.Validate(providedApiKey)) {
+				var key = await _apiKeys.Get(providedApiKey);
+				var claims = new List<Claim>
+				{
+					new Claim(ClaimTypes.Name, key.Name)
+				};
+
+				var identity = new ClaimsIdentity(claims, Options.AuthenticationType);
+				var principal = new ClaimsPrincipal(new[] { identity });
+				var ticket = new AuthenticationTicket(principal, Options.Scheme);
+
+				return AuthenticateResult.Success(ticket);
+			}
+
+			return AuthenticateResult.Fail("Invalid API Key provided.");
+		}
+
+		protected override async Task HandleChallengeAsync(AuthenticationProperties properties) {
+			Response.StatusCode = 401;
+		}
+
+		protected override async Task HandleForbiddenAsync(AuthenticationProperties properties) {
+			Response.StatusCode = 403;
+		}
+	}
+
+}

src/Robware.Api.Auth/ApiKey/ApiKeyAuthenticationOptions.cs

@@ -0,0 +1,9 @@
+using Microsoft.AspNetCore.Authentication;
+
+namespace Robware.Api.Auth.ApiKey {
+	public class ApiKeyAuthenticationOptions : AuthenticationSchemeOptions {
+		public const string DefaultScheme = "API Key";
+		public string Scheme => DefaultScheme;
+		public string AuthenticationType = DefaultScheme;
+	}
+}

src/Robware.Api.Auth/ApiKey/AuthenticationBuilderExtensions.cs

@@ -0,0 +1,10 @@
+using Microsoft.AspNetCore.Authentication;
+using System;
+
+namespace Robware.Api.Auth.ApiKey {
+	public static class AuthenticationBuilderExtensions {
+		public static AuthenticationBuilder AddApiKeySupport(this AuthenticationBuilder authenticationBuilder, Action<ApiKeyAuthenticationOptions> options) {
+			return authenticationBuilder.AddScheme<ApiKeyAuthenticationOptions, ApiKeyAuthenticationHandler>(ApiKeyAuthenticationOptions.DefaultScheme, options);
+		}
+	}
+}

src/Robware.Api.Auth/Startup.cs

@@ -4,6 +4,7 @@ using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Hosting;
 using MongoDB.Driver;
+using Robware.Api.Auth.ApiKey;
 using Robware.Auth.API;
 using Robware.Auth.Users;
 using Robware.Data;
@@ -26,6 +27,12 @@ namespace Robware.Api.Auth {
 			        .AddSingleton<IUsers, UserRepository>()
 			        .AddSingleton<IApiKeyValidator, ApiKeyValidator>()
 			        .AddSingleton<IApiKeys, ApiKeyRepository>();
+
+			services.AddAuthentication(options => {
+				options.DefaultAuthenticateScheme = ApiKeyAuthenticationOptions.DefaultScheme;
+				options.DefaultChallengeScheme = ApiKeyAuthenticationOptions.DefaultScheme;
+			})
+			.AddApiKeySupport(options=>{});
 		}
 
 		private IMongoDatabase SetupMongoDatabase() {
@@ -43,6 +50,8 @@ namespace Robware.Api.Auth {
 
 			app.UseRouting();
 
+			app.UseAuthentication();
+
 			app.UseAuthorization();
 
 			app.UseEndpoints(endpoints => {

src/Robware.Data/ApiKeyRepository.cs

@@ -1,10 +1,19 @@
 using Robware.Auth.API;
+using System;
 using System.Threading.Tasks;
 
 namespace Robware.Data {
 	public class ApiKeyRepository : IApiKeys {
-		public Task<ApiKey> Get(string key) {
+		public async Task<ApiKey> Get(string key) {
-			throw new System.NotImplementedException();
+			if (key=="denied")
+				throw new ApiKeyNotFoundException(key);
+				
+			return new ApiKey {
+				Name = "Hardcoded key",
+				Key = key,
+				Enabled = true,
+				IssueTimestamp = DateTime.Now
+			};
 		}
 	}
 }