Implemented exposed values.

src/Squidex.Web/ExposedConfiguration.cs

@@ -0,0 +1,15 @@
+// ==========================================================================
+//  Squidex Headless CMS
+// ==========================================================================
+//  Copyright (c) Squidex UG (haftungsbeschraenkt)
+//  All rights reserved. Licensed under the MIT license.
+// ==========================================================================
+
+using System.Collections.Generic;
+
+namespace Squidex.Web
+{
+    public sealed class ExposedConfiguration : Dictionary<string, string>
+    {
+    }
+}

src/Squidex.Web/ExposedValues.cs

@@ -0,0 +1,56 @@
+// ==========================================================================
+//  Squidex Headless CMS
+// ==========================================================================
+//  Copyright (c) Squidex UG (haftungsbeschraenkt)
+//  All rights reserved. Licensed under the MIT license.
+// ==========================================================================
+
+using System.Collections.Generic;
+using System.Text;
+using Microsoft.Extensions.Configuration;
+using Squidex.Infrastructure;
+
+namespace Squidex.Web
+{
+    public sealed class ExposedValues : Dictionary<string, string>
+    {
+        public ExposedValues()
+        {
+        }
+
+        public ExposedValues(ExposedConfiguration configured, IConfiguration configuration)
+        {
+            Guard.NotNull(configured, nameof(configured));
+            Guard.NotNull(configuration, nameof(configuration));
+
+            foreach (var kvp in configured)
+            {
+                var value = configuration.GetValue<string>(kvp.Value);
+
+                if (!string.IsNullOrWhiteSpace(value))
+                {
+                    this[kvp.Key] = value;
+                }
+            }
+        }
+
+        public override string ToString()
+        {
+            var sb = new StringBuilder();
+
+            foreach (var kvp in this)
+            {
+                if (sb.Length > 0)
+                {
+                    sb.Append(", ");
+                }
+
+                sb.Append(kvp.Key);
+                sb.Append(": ");
+                sb.Append(kvp.Value);
+            }
+
+            return sb.ToString();
+        }
+    }
+}

src/Squidex/Areas/Api/Controllers/Ping/PingController.cs

@@ -18,9 +18,26 @@ namespace Squidex.Areas.Api.Controllers.Ping
     [ApiExplorerSettings(GroupName = nameof(Ping))]
     public sealed class PingController : ApiController
     {
-        public PingController(ICommandBus commandBus)
+        private readonly ExposedValues exposedValues;
+
+        public PingController(ICommandBus commandBus, ExposedValues exposedValues)
             : base(commandBus)
         {
+            this.exposedValues = exposedValues;
+        }
+
+        /// <summary>
+        /// Get general info status of the API.
+        /// </summary>
+        /// <returns>
+        /// 200 => Infos returned.
+        /// </returns>
+        [HttpGet]
+        [ProducesResponseType(typeof(ExposedValues), 200)]
+        [Route("info/")]
+        public IActionResult Info()
+        {
+            return Ok(exposedValues);
         }
 
         /// <summary>

src/Squidex/Config/Web/WebServices.cs

@@ -8,6 +8,7 @@
 using Microsoft.AspNetCore.Authentication;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Options;
 using Squidex.Config.Domain;
 using Squidex.Domain.Apps.Entities;
 using Squidex.Pipeline.Plugins;
@@ -21,6 +22,9 @@ namespace Squidex.Config.Web
     {
         public static void AddMyMvcWithPlugins(this IServiceCollection services, IConfiguration config)
         {
+            services.AddSingletonAs(c => new ExposedValues(c.GetRequiredService<IOptions<ExposedConfiguration>>().Value, config))
+                .AsSelf();
+
             services.AddSingletonAs<FileCallbackResultExecutor>()
                 .AsSelf();
 

src/Squidex/appsettings.json

@@ -120,8 +120,8 @@
     /*
      * The text for the robots.txt file
      */
-      "text": "User-agent: *\nAllow: /api/assets/*"
-    },
+    "text": "User-agent: *\nAllow: /api/assets/*"
+  },
 
   "healthz": {
     "gc": {
@@ -470,5 +470,12 @@
      * Set to true to rebuild indexes.
      */
     "indexes": false
+  },
+
+  /*
+   * A list of configuration valeus that should be exposed from the info endpoint and in the UI.
+   */
+  "exposedConfiguration": {
+    "MY_KEY": "MY_VALUE"
   }
 }

tests/Squidex.Web.Tests/ExposedValuesTests.cs

@@ -0,0 +1,77 @@
+// ==========================================================================
+//  Squidex Headless CMS
+// ==========================================================================
+//  Copyright (c) Squidex UG (haftungsbeschraenkt)
+//  All rights reserved. Licensed under the MIT license.
+// ==========================================================================
+
+using FakeItEasy;
+using Microsoft.Extensions.Configuration;
+using Xunit;
+
+namespace Squidex.Web
+{
+    public class ExposedValuesTests
+    {
+        [Fact]
+        public void Should_create_from_configuration()
+        {
+            var source = new ExposedConfiguration
+            {
+                ["name1"] = "config1",
+                ["name2"] = "config2",
+                ["name3"] = "config3",
+            };
+
+            var configuration = A.Fake<IConfiguration>();
+
+            SetupConfiguration(configuration, "config1", "value1");
+            SetupConfiguration(configuration, "config2", "value2");
+
+            var values = new ExposedValues(source, configuration);
+
+            Assert.Equal(2, values.Count);
+            Assert.Equal("value1", values["name1"]);
+            Assert.Equal("value2", values["name2"]);
+        }
+
+        [Fact]
+        public void Should_format_empty_values()
+        {
+            var values = new ExposedValues();
+
+            Assert.Empty(values.ToString());
+        }
+
+        [Fact]
+        public void Should_format_from_single_value()
+        {
+            var values = new ExposedValues
+            {
+                ["name1"] = "value1"
+            };
+
+            Assert.Equal("name1: value1", values.ToString());
+        }
+
+        [Fact]
+        public void Should_format_from_multiple_values()
+        {
+            var values = new ExposedValues
+            {
+                ["name1"] = "value1",
+                ["name2"] = "value2"
+            };
+
+            Assert.Equal("name1: value1, name2: value2", values.ToString());
+        }
+
+        private static void SetupConfiguration(IConfiguration configuration, string key, string value)
+        {
+            var configSection = A.Fake<IConfigurationSection>();
+
+            A.CallTo(() => configSection.Value).Returns(value);
+            A.CallTo(() => configuration.GetSection(key)).Returns(configSection);
+        }
+    }
+}