[AAE-2261] [ADF] can't open the downloaded task audit file

src/api-legacy/activiti-rest-api/docs/TaskApi.md

@@ -533,6 +533,41 @@ Name | Type | Description  | Notes
 
 No authorization required
 
+### HTTP request headers
+
+ - **Content-Type**: application/json
+ - **Accept**: application/json
+
+
+<a name="getTaskAuditPdf"></a>
+# **getTaskAuditPdf**
+> Blob getTaskAuditPdf(taskId)
+
+Retrieve audit information in pdf format
+
+### Example
+```javascript
+
+var taskId = "taskId_example"; // String | taskId
+
+
+this.alfrescoJsApi.activiti.taskApi.getTaskAuditPdf(taskId);
+```
+
+### Parameters
+
+Name | Type | Description  | Notes
+------------- | ------------- | ------------- | -------------
+ **taskId** | **String**| taskId | 
+
+### Return type
+
+[**Blob**]()
+
+### Authorization
+
+No authorization required
+
 ### HTTP request headers
 
  - **Content-Type**: application/json

src/api-legacy/activiti-rest-api/src/api/TaskApi.ts

@@ -114,12 +114,12 @@ export class TaskApi {
         return this.tasksApi.getTaskAuditLog(taskId);
     }
 
-    getTaskAuditJson(taskId: string) {
+    getTaskAuditJson(taskId: string): Promise<TaskAuditInfoRepresentation> {
         return this.tasksApi.getTaskAuditLog(taskId);
     }
 
     getTaskAuditPdf(taskId: string) {
-        return this.tasksApi.getTaskAuditLog(taskId);
+        return this.tasksApi.getTaskAuditPdf(taskId);
     }
 
     getRelatedContentForTask(taskId: string, opts?: any): Promise<ResultListDataRepresentationRelatedContentRepresentation> {

src/api/activiti-rest-api/api/tasks.api.ts

@@ -353,6 +353,36 @@ export class TasksApi extends BaseApi {
             pathParams, queryParams, headerParams, formParams, postBody,
             contentTypes, accepts, TaskAuditInfoRepresentation);
     }
+
+    /**
+     * Get the audit log for a task
+     * @param taskId taskId
+     * @return Promise<Blob> task audit in blob
+     */
+    getTaskAuditPdf(taskId: string): Promise<Blob> {
+        throwIfNotDefined(taskId, 'taskId');
+
+        let postBody = null;
+
+        let pathParams = {
+            'taskId': taskId
+        };
+
+        let queryParams = {};
+        let headerParams = {};
+        let formParams = {};
+
+        let contentTypes = ['application/json'];
+        let accepts = ['application/json'];
+        let responseType = 'blob';
+
+        // Todo: update url once ACTIVITI-4191 fixed
+        return this.apiClient.callApi(
+            'app/rest/tasks/{taskId}/audit', 'GET',
+            pathParams, queryParams, headerParams, formParams, postBody,
+            contentTypes, accepts, responseType);
+    }
+
     /**
         * Get a task
         *