Feature/del 2757 languages in sdk

Kentico.Kontent.Delivery.Abstractions/DeliveryClientExtensions.cs

@@ -65,5 +65,16 @@ public static Task<IDeliveryTaxonomyListingResponse> GetTaxonomiesAsync(this IDe
         {
             return client.GetTaxonomiesAsync(parameters);
         }
+
+        /// <summary>
+        /// Returns languages.
+        /// </summary>
+        /// <param name="client">An instance of the <see cref="IDeliveryClient"/></param>
+        /// <param name="parameters">An array that contains zero or more query parameters, for example, for paging.</param>
+        /// <returns>The <see cref="IDeliveryLanguageListingResponse"/> instance that represents the languages. If no query parameters are specified, all languages are returned.</returns>
+        public static Task<IDeliveryLanguageListingResponse> GetLanguagesAsync(this IDeliveryClient client, params IQueryParameter[] parameters)
+        {
+            return client.GetLanguagesAsync(parameters);
+        }
     }
 }

Kentico.Kontent.Delivery.Abstractions/IDeliveryClient.cs

@@ -68,5 +68,13 @@ public interface IDeliveryClient
         /// <param name="parameters">A collection of query parameters, for example, for paging.</param>
         /// <returns>The <see cref="IDeliveryTaxonomyListingResponse"/> instance that represents the taxonomy groups. If no query parameters are specified, all taxonomy groups are returned.</returns>
         Task<IDeliveryTaxonomyListingResponse> GetTaxonomiesAsync(IEnumerable<IQueryParameter> parameters = null);
+
+
+        /// <summary>
+        /// Returns languages.
+        /// </summary>
+        /// <param name="parameters">A collection of query parameters, for example, for paging.</param>
+        /// <returns>The <see cref="IDeliveryLanguageListingResponse"/> instance that represents the languages. If no query parameters are specified, all languages are returned.</returns>
+        Task<IDeliveryLanguageListingResponse> GetLanguagesAsync(IEnumerable<IQueryParameter> parameters = null);
     }
 }

Kentico.Kontent.Delivery.Abstractions/Languages/IDeliveryLanguageListingResponse.cs

@@ -0,0 +1,15 @@
+using System.Collections.Generic;
+
+namespace Kentico.Kontent.Delivery.Abstractions
+{
+    /// <summary>
+    /// Represents a response from Kentico Kontent Delivery API that contains a list of languages.
+    /// </summary>
+    public interface IDeliveryLanguageListingResponse : IResponse, IPageable
+    {
+        /// <summary>
+        /// Gets a read-only list of languages.
+        /// </summary>
+        IList<ILanguage> Languages { get; }
+    }
+}

Kentico.Kontent.Delivery.Abstractions/Languages/ILanguage.cs

@@ -0,0 +1,13 @@
+namespace Kentico.Kontent.Delivery.Abstractions
+{
+    /// <summary>
+    /// Represents a language.
+    /// </summary>
+    public interface ILanguage
+    {
+        /// <summary>
+        /// Gets the system attributes of the language.
+        /// </summary>
+        ILanguageSystemAttributes System { get; }
+    }
+}

Kentico.Kontent.Delivery.Abstractions/Languages/ILanguageSystemAttributes.cs

@@ -0,0 +1,9 @@
+namespace Kentico.Kontent.Delivery.Abstractions
+{
+    /// <summary>
+    /// Represents system attributes of a language.
+    /// </summary>
+    public interface ILanguageSystemAttributes : ISystemBaseAttributes
+    {
+    }
+}

Kentico.Kontent.Delivery.Abstractions/SharedModels/ISystemAttributes.cs

@@ -3,28 +3,13 @@
 namespace Kentico.Kontent.Delivery.Abstractions
 {
     /// <summary>
-    /// Represents system attributes of any object in Kentico Kontent.
+    /// Represents system attributes of ContentItem, ContentType and Taxonomy objects in Kentico Kontent.
     /// </summary>
-    public interface ISystemAttributes
+    public interface ISystemAttributes : ISystemBaseAttributes
     {
-        /// <summary>
-        /// Gets the codename of the object.
-        /// </summary>
-        string Codename { get; }
-
-        /// <summary>
-        /// Gets the identifier of the object.
-        /// </summary>
-        string Id { get; }
-
         /// <summary>
         /// Gets the time the object was last modified.
         /// </summary>
         DateTime LastModified { get; }
-
-        /// <summary>
-        /// Gets the name of the object.
-        /// </summary>
-        string Name { get; }
     }
 }

Kentico.Kontent.Delivery.Abstractions/SharedModels/ISystemBaseAttributes.cs

@@ -0,0 +1,23 @@
+namespace Kentico.Kontent.Delivery.Abstractions
+{
+    /// <summary>
+    /// Represents system base attributes of any object in Kentico Kontent.
+    /// </summary>
+    public interface ISystemBaseAttributes
+    {
+        /// <summary>
+        /// Gets the codename of the object.
+        /// </summary>
+        string Codename { get; }
+
+        /// <summary>
+        /// Gets the identifier of the object.
+        /// </summary>
+        string Id { get; }
+
+        /// <summary>
+        /// Gets the name of the object.
+        /// </summary>
+        string Name { get; }
+    }
+}

Kentico.Kontent.Delivery.Caching.Tests/DeliveryClientCacheTests.cs

@@ -606,5 +606,86 @@ public async Task GetTaxonomiesAsync_InvalidatedByTaxonomiesDependency(CacheExpi
         }
 
         #endregion
+
+        #region GetLanguages
+
+        [Theory]
+        [InlineData(CacheTypeEnum.Memory, CacheExpirationType.Absolute)]
+        [InlineData(CacheTypeEnum.Memory, CacheExpirationType.Sliding)]
+        [InlineData(CacheTypeEnum.Distributed, CacheExpirationType.Absolute)]
+        [InlineData(CacheTypeEnum.Distributed, CacheExpirationType.Sliding)]
+        public async Task GetLanguagesAsync_ResponseIsCached(CacheTypeEnum cacheType, CacheExpirationType cacheExpirationType)
+        {
+            var url = "languages";
+            var languageA = CreateLanguage("language_codename", "language name");
+            var languages = CreateLanguagesResponse(new[] { languageA });
+            var updatedLanguages = CreateLanguagesResponse(new[] { languageA, CreateLanguage("second_language_codename", "Second language") });
+
+            var scenarioBuilder = new ScenarioBuilder(cacheType, cacheExpirationType);
+
+            var scenario = scenarioBuilder.WithResponse(url, languages).Build();
+            var firstResponse = await scenario.CachingClient.GetLanguagesAsync();
+
+            scenario = scenarioBuilder.WithResponse(url, updatedLanguages).Build();
+            var secondResponse = await scenario.CachingClient.GetLanguagesAsync();
+
+            firstResponse.Should().NotBeNull();
+            firstResponse.Should().BeEquivalentTo(secondResponse, o => o.DateTimesBsonCorrection());
+            scenario.GetRequestCount(url).Should().Be(1);
+        }
+
+        [Theory]
+        [InlineData(CacheTypeEnum.Memory, CacheExpirationType.Absolute)]
+        [InlineData(CacheTypeEnum.Memory, CacheExpirationType.Sliding)]
+        [InlineData(CacheTypeEnum.Distributed, CacheExpirationType.Absolute)]
+        [InlineData(CacheTypeEnum.Distributed, CacheExpirationType.Sliding)]
+        public async Task GetLanguagesAsync_InvalidatedByLanguagesKey(CacheTypeEnum cacheType, CacheExpirationType cacheExpirationType)
+        {
+            var url = "languages";
+            var languageA = CreateLanguage("language_codename", "language name");
+            var languages = CreateLanguagesResponse(new[] { languageA });
+            var updatedLanguages = CreateLanguagesResponse(new[] { languageA, CreateLanguage("second_language_codename", "Second language") });
+
+            var scenarioBuilder = new ScenarioBuilder(cacheType, cacheExpirationType);
+
+            var scenario = scenarioBuilder.WithResponse(url, languages).Build();
+            var firstResponse = await scenario.CachingClient.GetLanguagesAsync();
+
+            scenario = scenarioBuilder.WithResponse(url, updatedLanguages).Build();
+            scenario.InvalidateDependency(CacheHelpers.GetLanguagesKey(null));
+            var secondResponse = await scenario.CachingClient.GetLanguagesAsync();
+
+            firstResponse.Should().NotBeNull();
+            secondResponse.Should().NotBeNull();
+            firstResponse.Should().NotBeEquivalentTo(secondResponse);
+            scenario.GetRequestCount(url).Should().Be(2);
+        }
+
+        [Theory]
+        [InlineData(CacheExpirationType.Absolute)]
+        [InlineData(CacheExpirationType.Sliding)]
+        public async Task GetLanguagesAsync_InvalidatedByLanguagesDependency(CacheExpirationType cacheExpirationType)
+        {
+            var url = "languages";
+            var languageA = CreateLanguage("language_codename", "language name");
+            var languages = CreateLanguagesResponse(new[] { languageA });
+            var updatedLanguages = CreateLanguagesResponse(new[] { languageA, CreateLanguage("second_language_codename", "Second language") });
+
+            var scenarioBuilder = new ScenarioBuilder(cacheExpirationType: cacheExpirationType);
+
+            var scenario = scenarioBuilder.WithResponse(url, languages).Build();
+            var firstResponse = await scenario.CachingClient.GetLanguagesAsync();
+
+            scenario = scenarioBuilder.WithResponse(url, updatedLanguages).Build();
+            scenario.InvalidateDependency(CacheHelpers.GetLanguagesDependencyKey());
+            var secondResponse = await scenario.CachingClient.GetLanguagesAsync();
+
+            firstResponse.Should().NotBeNull();
+            secondResponse.Should().NotBeNull();
+            firstResponse.Should().NotBeEquivalentTo(secondResponse);
+            scenario.GetRequestCount(url).Should().Be(2);
+        }
+
+        #endregion
     }
 }

Kentico.Kontent.Delivery.Caching.Tests/ResponseHelper.cs

@@ -55,6 +55,18 @@ public static class ResponseHelper
             }
         };
 
+        internal static object CreateLanguagesResponse(ICollection<object> languages) => new
+        {
+            languages,
+            pagination = new
+            {
+                skip = 0,
+                limit = 0,
+                count = languages.Count,
+                next_page = ""
+            }
+        };
+
         internal static object CreateItem(string codename, string value = null) => new
         {
             elements = new Dictionary<string, object>
@@ -135,6 +147,16 @@ internal static (string codename, object item) CreateComponent()
             }
         };
 
+        internal static object CreateLanguage(string codename, string name) => new
+        {
+            system = new
+            {
+                id = Guid.NewGuid().ToString(),
+                codename,
+                name
+            }
+        };
+
         internal static object CreateContentElement(string codename, string name) => new
         {
             type = "text",

Kentico.Kontent.Delivery.Caching/CacheHelpers.cs

@@ -24,13 +24,16 @@ public static class CacheHelpers
         private const string TAXONOMY_GROUP_IDENTIFIER = "taxonomy_group";
         private const string TAXONOMY_GROUP_LISTING_IDENTIFIER = "taxonomy_group_listing";
 
+        private const string LANGUAGE_LISTING_IDENTIFIER = "language_listing";
+
         private const string CONTENT_TYPE_ELEMENT_IDENTIFIER = "content_type_element";
 
         private const string DEPENDENCY_ITEM = "dependency_item";
         private const string DEPENDENCY_ITEM_LISTING = "dependency_item_listing";
         private const string DEPENDENCY_TYPE_LISTING = "dependency_type_listing";
         private const string DEPENDENCY_TAXONOMY_GROUP = "dependency_taxonomy_group";
         private const string DEPENDENCY_TAXONOMY_GROUP_LISTING = "dependency_taxonomy_group_listing";
+        private const string DEPENDENCY_LANGUAGE_LISTING = "dependency_language_listing";
 
         #endregion
 
@@ -100,6 +103,16 @@ public static string GetTaxonomiesKey(IEnumerable<IQueryParameter> parameters)
             return StringHelpers.Join(new[] { TAXONOMY_GROUP_LISTING_IDENTIFIER }.Concat(parameters?.Select(x => x.GetQueryStringParameter()) ?? Enumerable.Empty<string>()));
         }
 
+        /// <summary>
+        /// Gets Languages dependency key
+        /// </summary>
+        /// <param name="parameters">Query Parameters</param>
+        /// <returns>Dependency key</returns>
+        public static string GetLanguagesKey(IEnumerable<IQueryParameter> parameters)
+        {
+            return StringHelpers.Join(new[] { LANGUAGE_LISTING_IDENTIFIER }.Concat(parameters?.Select(x => x.GetQueryStringParameter()) ?? Enumerable.Empty<string>()));
+        }
+
         /// <summary>
         /// Gets a ContentElement dependency key
         /// </summary>
@@ -161,6 +174,15 @@ public static string GetTaxonomiesDependencyKey()
             return DEPENDENCY_TAXONOMY_GROUP_LISTING;
         }
 
+        /// <summary>
+        /// Gets Languages dependency key
+        /// </summary>
+        /// <returns>Dependency key</returns>
+        public static string GetLanguagesDependencyKey()
+        {
+            return DEPENDENCY_LANGUAGE_LISTING;
+        }
+
         #endregion
 
         #region Dependecies
@@ -282,6 +304,18 @@ public static IEnumerable<string> GetTaxonomiesDependencies(IDeliveryTaxonomyLis
                 : Enumerable.Empty<string>();
         }
 
+        /// <summary>
+        /// Gets languages dependency keys from response
+        /// </summary>
+        /// <param name="response">Response</param>
+        /// <returns>Dependency keys</returns>
+        public static IEnumerable<string> GetlanguagesDependencies(IDeliveryLanguageListingResponse response)
+        {
+            return response?.Languages != null
+                ? new[] { GetLanguagesDependencyKey() }
+                : Enumerable.Empty<string>();
+        }
+
         #endregion
 
         private static bool IsItemResponse(IResponse response)

Kentico.Kontent.Delivery.Caching/DeliveryClientCache.cs

@@ -141,5 +141,20 @@ public async Task<IDeliveryTaxonomyListingResponse> GetTaxonomiesAsync(IEnumerab
                 response => response.Taxonomies.Any(),
                 CacheHelpers.GetTaxonomiesDependencies);
         }
+
+        /// <summary>
+        /// Returns languages.
+        /// </summary>
+        /// <param name="parameters">A collection of query parameters, for example, for paging.</param>
+        /// <returns>The <see cref="IDeliveryLanguageListingResponse"/> instance that represents the languages. If no query parameters are specified, all languages are returned.</returns>
+        public async Task<IDeliveryLanguageListingResponse> GetLanguagesAsync(IEnumerable<IQueryParameter> parameters = null)
+        {
+            var queryParameters = parameters?.ToList();
+            return await _deliveryCacheManager.GetOrAddAsync(
+                CacheHelpers.GetLanguagesKey(queryParameters),
+                () => _deliveryClient.GetLanguagesAsync(queryParameters),
+                response => response.Languages.Any(),
+                CacheHelpers.GetlanguagesDependencies);
+        }
     }
 }

Kentico.Kontent.Delivery.Rx.Tests/DeliveryObservableProxyTests.cs

@@ -171,6 +171,16 @@ public void TaxonomiesRetrieved()
             Assert.All(taxonomies, taxonomy => Assert.NotNull(taxonomy.Terms));
         }
 
+        [Fact]
+        public void LanguagesRetrieved()
+        {
+            var observable = new DeliveryObservableProxy(GetDeliveryClient(MockLanguages)).GetLanguagesObservable(new SkipParameter(1));
+            var languages = observable.ToEnumerable().ToList();
+
+            Assert.NotEmpty(languages);
+            Assert.All(languages, language => Assert.NotNull(language.System));
+        }
+
         private IDeliveryClient GetDeliveryClient(Action mockAction)
         {
             mockAction();
@@ -263,6 +273,13 @@ private void MockTaxonomies()
                 .Respond("application/json", File.ReadAllText(Path.Combine(Environment.CurrentDirectory, $"Fixtures{Path.DirectorySeparatorChar}taxonomies_multiple.json")));
         }
 
+        private void MockLanguages()
+        {
+            _mockHttp.When($"{_baseUrl}/languages")
+                .WithQueryString("skip=1")
+                .Respond("application/json", File.ReadAllText(Path.Combine(Environment.CurrentDirectory, $"Fixtures{Path.DirectorySeparatorChar}languages.json")));
+        }
+
         private static void AssertArticlePropertiesNotNull(Article item)
         {
             Assert.NotNull(item.System);