#4303: add search function.

Oqtane.Shared/Models/SearchDocument.cs

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+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations.Schema;
+using System.Text.Json;
+namespace Oqtane.Models
+{
+    public class SearchDocument : ModelBase
+    {
+        public int SearchDocumentId { get; set; }
+
+        [NotMapped]
+        public string UniqueKey => $"{IndexerName}:{EntryId}";
+
+        public int EntryId { get; set; }
+
+        public string IndexerName { get; set; }
+
+        public int SiteId { get; set; }
+
+        public string Title { get; set; }
+
+        public string Description { get; set; }
+
+        public string Body { get; set; }
+
+        public string Url { get; set; }
+
+        public DateTime ModifiedTime { get; set; }
+
+        public bool IsActive { get; set; }
+
+        public string AdditionalContent { get; set; }
+
+        public string LanguageCode { get; set; }
+
+        public IList<SearchDocumentTag> Tags { get; set; }
+
+        public IList<SearchDocumentProperty> Properties { get; set; }
+
+        public override string ToString()
+        {
+            return JsonSerializer.Serialize(this);
+        }
+    }
+}

Oqtane.Shared/Models/SearchDocumentProperty.cs

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+using System.ComponentModel.DataAnnotations;
+using Microsoft.EntityFrameworkCore;
+
+namespace Oqtane.Models
+{
+    public class SearchDocumentProperty
+    {
+        [Key]
+        public int PropertyId { get; set; }
+
+        public int SearchDocumentId { get; set; }
+
+        public string Name { get; set; }
+
+        public string Value { get; set; }
+    }
+}

Oqtane.Shared/Models/SearchDocumentTag.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace Oqtane.Models
+{
+    public class SearchDocumentTag
+    {
+        [Key]
+        public int TagId { get; set; }
+
+        public int SearchDocumentId { get; set; }
+
+        public string Tag { get; set; }
+    }
+}

Oqtane.Shared/Models/SearchQuery.cs

@@ -0,0 +1,37 @@
+using System;
+using System.Collections.Generic;
+using Oqtane.Shared;
+
+namespace Oqtane.Models
+{
+    public class SearchQuery
+    {
+        public int SiteId { get; set; }
+
+        public Alias Alias { get; set; }
+
+        public User User { get; set; }
+
+        public string Keywords { get; set; }
+
+        public IList<string> Sources { get; set; } = new List<string>();
+
+        public DateTime BeginModifiedTimeUtc { get; set; }
+
+        public DateTime EndModifiedTimeUtc { get; set; }
+
+        public IList<string> Tags { get; set; } = new List<string>();
+
+        public IDictionary<string, string> Properties { get; set; } = new Dictionary<string, string>();
+
+        public int PageIndex { get; set; }
+
+        public int PageSize { get; set; }
+
+        public SearchSortFields SortField { get; set; }
+
+        public SearchSortDirections SortDirection { get; set; }
+
+        public int BodySnippetLength { get; set;} = 255;
+    }
+}

Oqtane.Shared/Models/SearchResult.cs

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+namespace Oqtane.Models
+{
+    public class SearchResult : SearchDocument
+    {
+        public float Score { get; set; }
+
+        public string DisplayScore { get; set; }
+
+        public string Snippet { get; set; }
+    }
+}

Oqtane.Shared/Models/SearchResults.cs

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+using System.Collections.Generic;
+
+namespace Oqtane.Models
+{
+    public class SearchResults
+    {
+        public IList<SearchResult> Results { get; set; }
+
+        public int TotalResults { get; set; }
+    }
+}