Add endpoint in preview to get footer

backend/src/Designer/Controllers/PreviewController.cs

@@ -933,12 +933,16 @@ public IActionResult UpdateAttachmentWithTag(string org, string app, [FromQuery]
         /// </summary>
         /// <param name="org">Unique identifier of the organisation responsible for the app.</param>
         /// <param name="app">Application identifier which is unique within an organisation.</param>
+        /// <param name="cancellationToken">A <see cref="CancellationToken"/> that observes if operation is cancelled.</param>
         /// <returns>Empty response</returns>
         [HttpGet]
         [Route("api/v1/footer")]
-        public IActionResult Footer(string org, string app)
+        public async Task<IActionResult> Footer(string org, string app, CancellationToken cancellationToken)
         {
-            return Ok();
+            string developer = AuthenticationHelper.GetDeveloperUserName(_httpContextAccessor.HttpContext);
+            AltinnAppGitRepository altinnAppGitRepository = _altinnGitRepositoryFactory.GetAltinnAppGitRepository(org, app, developer);
+            FooterFile footerFile = await altinnAppGitRepository.GetFooter(cancellationToken);
+            return Ok(footerFile);
         }
 
         /// <summary>

backend/src/Designer/Infrastructure/GitRepository/AltinnAppGitRepository.cs

@@ -44,6 +44,7 @@ public class AltinnAppGitRepository : AltinnGitRepository
         private const string LayoutSettingsFilename = "Settings.json";
         private const string AppMetadataFilename = "applicationmetadata.json";
         private const string LayoutSetsFilename = "layout-sets.json";
+        private const string FooterFilename = "footer.json";
         private const string RuleHandlerFilename = "RuleHandler.js";
         private const string RuleConfigurationFilename = "RuleConfiguration.json";
         private const string ProcessDefinitionFilename = "process.bpmn";
@@ -598,6 +599,15 @@ public async Task SaveLayoutSets(LayoutSets layoutSets)
             }
         }
 
+        public async Task<FooterFile> GetFooter(CancellationToken cancellationToken = default)
+        {
+            string footerFilePath = GetPathToFooterFile();
+            cancellationToken.ThrowIfCancellationRequested();
+            string fileContent = await ReadTextByRelativePathAsync(footerFilePath, cancellationToken);
+            FooterFile footerFileFile = JsonSerializer.Deserialize<FooterFile>(fileContent, JsonOptions);
+            return footerFileFile;
+        }
+
         /// <summary>
         /// Saves the RuleHandler.js for a specific layout set
         /// </summary>
@@ -838,6 +848,11 @@ private static string GetPathToLayoutSetsFile()
             return Path.Combine(LayoutsFolderName, LayoutSetsFilename);
         }
 
+        private static string GetPathToFooterFile()
+        {
+            return Path.Combine(LayoutsFolderName, FooterFilename);
+        }
+
         private static string GetPathToRuleHandler(string layoutSetName)
         {
             return layoutSetName.IsNullOrEmpty() ?

backend/src/Designer/Models/FooterFile.cs

@@ -0,0 +1,28 @@
+using System.Collections.Generic;
+using System.Text.Json.Serialization;
+
+namespace Altinn.Studio.Designer.Models;
+
+public class FooterFile
+{
+    [JsonPropertyName("$schema")]
+    public string Schema { get; set; }
+
+    [JsonPropertyName("footer")]
+    public List<FooterConfig> Footer { get; set; }
+}
+
+public class FooterConfig
+{
+    [JsonPropertyName("type")]
+    public string Type { get; set; }
+
+    [JsonPropertyName("icon")]
+    public string Icon { get; set; }
+
+    [JsonPropertyName("title")]
+    public string Title { get; set; }
+
+    [JsonPropertyName("target")]
+    public string Target { get; set; }
+}