license show command

src/SeqCli/Cli/Commands/License/ShowCommand.cs

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+using System;
+using System.IO;
+using System.Text;
+using System.Threading.Tasks;
+using Seq.Api.Model;
+using Seq.Api.Model.License;
+using SeqCli.Cli.Features;
+using SeqCli.Config;
+using SeqCli.Connection;
+using SeqCli.Util;
+using Serilog;
+
+// ReSharper disable once UnusedType.Global
+
+namespace SeqCli.Cli.Commands.License;
+
+[Command("license", "show", "Shows license applied to the Seq server",
+    Example = "seqcli license show")]
+class ShowCommand : Command
+{
+    readonly SeqConnectionFactory _connectionFactory;
+    readonly ConnectionFeature _connection;
+    readonly OutputFormatFeature _output;
+
+    public ShowCommand(SeqConnectionFactory connectionFactory, SeqCliConfig config)
+    {
+        _connectionFactory = connectionFactory ?? throw new ArgumentNullException(nameof(connectionFactory));
+        _connection = Enable<ConnectionFeature>();
+        _output = Enable(new OutputFormatFeature(config.Output));
+    }
+
+    protected override async Task<int> Run()
+    {
+        var connection = _connectionFactory.Connect(_connection);
+        var license = await connection.Licenses.FindCurrentAsync();
+
+        if (license == null)
+        {
+            Log.Warning("No license is currently applied to the server.");
+            return 2;
+        }
+
+        _output.WriteEntity(_output.Json ? license : new OutputWrapperLicenseEntity(license));
+
+        return 0;
+    }
+
+    /// <summary>
+    /// Wraps the license entity for none json output.
+    /// </summary>
+    class OutputWrapperLicenseEntity : Entity
+    {
+        public OutputWrapperLicenseEntity(LicenseEntity license)
+        {
+            this.Id = license.LicenseText;
+        }
+    }
+}

test/SeqCli.EndToEnd/License/LicenceShowTestCase.cs

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+using System;
+using System.IO;
+using System.Threading.Tasks;
+using Seq.Api;
+using SeqCli.EndToEnd.Support;
+using Serilog;
+using Xunit;
+
+namespace SeqCli.EndToEnd.License;
+
+public class LicenseShowTestCase : ICliTestCase
+{
+    readonly TestDataFolder _testDataFolder;
+
+    public LicenseShowTestCase(TestDataFolder testDataFolder)
+    {
+        _testDataFolder = testDataFolder;
+    }
+
+    public Task ExecuteAsync(SeqConnection connection, ILogger logger, CliCommandRunner runner)
+    {
+
+        // test empty text output if no license is applied
+        runner.Exec("license show");
+        Assert.Equal(
+            "",
+            runner.LastRunProcess.Output.Trim());
+
+        // test json output if no license is applied
+        runner.Exec("license show --json");
+        Assert.Contains(
+            "You're using the free Individual license.",
+            runner.LastRunProcess.Output.Trim());
+        return Task.CompletedTask;
+    }
+}