#4303: add search function.

Oqtane.Shared/Interfaces/IModuleSearch.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Oqtane.Models;
+
+namespace Oqtane.Interfaces
+{
+    public interface IModuleSearch
+    {
+        public IList<SearchDocument> GetSearchDocuments(Module module, DateTime startTime);
+    }
+}

Oqtane.Shared/Interfaces/ISearchIndexManager.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using System.Web;
+using Oqtane.Models;
+
+namespace Oqtane.Services
+{
+    public interface ISearchIndexManager
+    {
+        int Priority { get; }
+
+        string Name { get; }
+
+        bool IsIndexEnabled(int siteId);
+
+        int IndexDocuments(int siteId, DateTime? startTime, Action<IList<SearchDocument>> processSearchDocuments, Action<string> handleError);
+    }
+}

Oqtane.Shared/Interfaces/ISearchProvider.cs

@@ -0,0 +1,26 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Oqtane.Models;
+
+namespace Oqtane.Services
+{
+    public interface ISearchProvider
+    {
+        string Name { get; }
+
+        void SaveDocument(SearchDocument document, bool autoCommit = false);
+
+        void DeleteDocument(string id);
+
+        Task<SearchResults> SearchAsync(SearchQuery searchQuery, Func<SearchDocument, SearchQuery, bool> validateFunc);
+        
+        bool Optimize();
+
+        void Commit();
+
+        void ResetIndex();
+    }
+}

Oqtane.Shared/Interfaces/ISearchResultManager.cs

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+using System;
+using Oqtane.Models;
+
+namespace Oqtane.Services
+{
+    public interface ISearchResultManager
+    {
+        string Name { get; }
+
+        bool Visible(SearchDocument searchResult, SearchQuery searchQuery);
+
+        string GetUrl(SearchResult searchResult, SearchQuery searchQuery);
+    }
+}

Oqtane.Shared/Interfaces/ISearchService.cs

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+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using Oqtane.Models;
+
+namespace Oqtane.Services
+{
+    public interface ISearchService
+    {
+        void IndexContent(int siteId, DateTime? startTime, Action<string> logNote, Action<string> handleError);
+
+        Task<SearchResults> SearchAsync(SearchQuery searchQuery);
+    }
+}