Add Icons application for serving website icons.

src/Icons/Controllers/IconController.cs

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+using System;
+using System.IO;
+using System.Net.Http;
+using System.Runtime.Serialization.Formatters.Binary;
+using System.Threading.Tasks;
+using Icons.Models;
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.AspNetCore.Mvc;
+
+namespace Icons.Controllers
+{
+    [Route("[controller]")]
+    public class IconController : Controller
+    {
+        private readonly IHostingEnvironment _hostingEnvironment;
+
+        public IconController(IHostingEnvironment hostingEnvironment)
+        {
+            _hostingEnvironment = hostingEnvironment;
+        }
+
+        [HttpGet]
+        public async Task<FileResult> Get([FromQuery] string domain)
+        {
+            var uri = BuildUrl(domain);
+            var fileName = $"{_hostingEnvironment.ContentRootPath}/cache/{domain}.cache";
+
+            // Attempt to load the icon from the cache.
+            if (FileExists(fileName))
+            {
+                using (Stream stream = System.IO.File.Open(fileName, FileMode.Open))
+                {
+                    var binaryFormatter = new BinaryFormatter();
+                    var icon = (Icon)binaryFormatter.Deserialize(stream);
+
+                    if (icon.HasNotExpired())
+                    {
+                        return new FileContentResult(icon.Image, icon.Format);
+                    }
+                }
+            }
+
+            var httpClient = new HttpClient();
+            var response = await httpClient.GetAsync(uri);
+
+            if (!response.IsSuccessStatusCode)
+            {
+                throw new Exception("Cannot load the image");
+            }
+
+            // Serialize the icon.
+            using (Stream stream = System.IO.File.Open(fileName, FileMode.Create))
+            {
+                var icon = new Icon(
+                    await response.Content.ReadAsByteArrayAsync(),
+                    response.Content.Headers.ContentType.MediaType
+                );
+
+                var binaryFormatter = new BinaryFormatter();
+                binaryFormatter.Serialize(stream, icon);
+                return new FileContentResult(icon.Image, icon.Format);
+            }
+        }
+
+        private static bool FileExists(string fileName)
+        {
+            return System.IO.File.Exists(fileName);
+        }
+
+        private static string BuildUrl(string domain)
+        {
+            return $"https://icons.bitwarden.com/icon?url={domain}&size=16..24..200";
+        }
+    }
+}

src/Icons/Icons.csproj

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+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+  <PropertyGroup>
+    <TargetFramework>netcoreapp2.0</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Folder Include="wwwroot\" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.AspNetCore.All" Version="2.0.0" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <DotNetCliToolReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Tools" Version="2.0.0" />
+  </ItemGroup>
+
+</Project>

src/Icons/Models/Icon.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.Serialization;
+using System.Threading.Tasks;
+
+namespace Icons.Models
+{
+    [Serializable]
+    public class Icon
+    {
+
+        public byte[] Image { get; }
+
+        public string Format { get; }
+        
+        public DateTime CreatedAt { get; }
+
+        public Icon(byte[] image, string format)
+        {
+            this.Image = image;
+            this.Format = format;
+            this.CreatedAt = DateTime.Now;
+        }
+
+        public bool HasNotExpired()
+        {
+            return CreatedAt > DateTime.Now.AddDays(-1);
+        }
+    }
+}

src/Icons/Program.cs

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+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore;
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.Logging;
+
+namespace Icons
+{
+    public class Program
+    {
+        public static void Main(string[] args)
+        {
+            BuildWebHost(args).Run();
+        }
+
+        public static IWebHost BuildWebHost(string[] args) =>
+            WebHost.CreateDefaultBuilder(args)
+                .UseStartup<Startup>()
+                .Build();
+    }
+}

src/Icons/Properties/launchSettings.json

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+{
+  "iisSettings": {
+    "windowsAuthentication": false,
+    "anonymousAuthentication": true,
+    "iisExpress": {
+      "applicationUrl": "http://localhost:50024/",
+      "sslPort": 0
+    }
+  },
+  "profiles": {
+    "IIS Express": {
+      "commandName": "IISExpress",
+      "launchBrowser": true,
+      "launchUrl": "icon?domain=bitwarden.com",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    },
+    "Icons": {
+      "commandName": "Project",
+      "launchBrowser": true,
+      "launchUrl": "icon?domain=bitwarden.com",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      },
+      "applicationUrl": "http://localhost:50025/"
+    }
+  }
+}

src/Icons/Startup.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Logging;
+using Microsoft.Extensions.Options;
+
+namespace Icons
+{
+    public class Startup
+    {
+        public Startup(IConfiguration configuration)
+        {
+            Configuration = configuration;
+        }
+
+        public IConfiguration Configuration { get; }
+
+        // This method gets called by the runtime. Use this method to add services to the container.
+        public void ConfigureServices(IServiceCollection services)
+        {
+            services.AddMvc();
+        }
+
+        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
+        public void Configure(IApplicationBuilder app, IHostingEnvironment env)
+        {
+            if (env.IsDevelopment())
+            {
+                app.UseDeveloperExceptionPage();
+            }
+
+            app.UseMvc();
+        }
+    }
+}

src/Icons/appsettings.Development.json

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+{
+  "Logging": {
+    "IncludeScopes": false,
+    "LogLevel": {
+      "Default": "Debug",
+      "System": "Information",
+      "Microsoft": "Information"
+    }
+  }
+}

src/Icons/appsettings.json

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+{
+  "Logging": {
+    "IncludeScopes": false,
+    "Debug": {
+      "LogLevel": {
+        "Default": "Warning"
+      }
+    },
+    "Console": {
+      "LogLevel": {
+        "Default": "Warning"
+      }
+    }
+  }
+}