Add:iOS offline ebooks

ios/App/Shared/models/server/EBookFile.swift

@@ -0,0 +1,78 @@
+//
+//  EBookFile.swift
+//  Audiobookshelf
+//
+//  Created by Advplyr on 6/19/23.
+//
+
+import Foundation
+import RealmSwift
+
+class EBookFile: EmbeddedObject, Codable {
+    @Persisted var ino: String = ""
+    @Persisted var metadata: FileMetadata?
+    @Persisted var ebookFormat: String
+    @Persisted var contentUrl: String?
+    @Persisted var localFileId: String?
+    
+    private enum CodingKeys : String, CodingKey {
+        case ino, metadata, ebookFormat, contentUrl, localFileId
+    }
+    
+    override init() {
+        super.init()
+    }
+    
+    required init(from decoder: Decoder) throws {
+        super.init()
+        let values = try decoder.container(keyedBy: CodingKeys.self)
+        ino = try values.decode(String.self, forKey: .ino)
+        metadata = try values.decode(FileMetadata.self, forKey: .metadata)
+        ebookFormat = try values.decode(String.self, forKey: .ebookFormat)
+        contentUrl = try? values.decode(String.self, forKey: .contentUrl)
+        localFileId = try? values.decodeIfPresent(String.self, forKey: .localFileId)
+    }
+    
+    func encode(to encoder: Encoder) throws {
+        var container = encoder.container(keyedBy: CodingKeys.self)
+        try container.encode(ino, forKey: .ino)
+        try container.encode(metadata, forKey: .metadata)
+        try container.encode(ebookFormat, forKey: .ebookFormat)
+        try container.encode(contentUrl, forKey: .contentUrl)
+        try container.encode(localFileId, forKey: .localFileId)
+    }
+}
+
+extension EBookFile {
+    func setLocalInfo(localFile: LocalFile) -> Bool {
+        self.localFileId = localFile.id
+        self.contentUrl = localFile.contentUrl
+        return false
+    }
+    
+    func getLocalFile() -> LocalFile? {
+        guard let localFileId = self.localFileId else { return nil }
+        return Database.shared.getLocalFile(localFileId: localFileId)
+    }
+    
+    func mimeType() -> String? {
+        var mimeType = ""
+        switch ebookFormat {
+        case "epub":
+            mimeType = "application/epub+zip"
+        case "pdf":
+            mimeType = "application/pdf"
+        case "mobi":
+            mimeType = "application/x-mobipocket-ebook"
+        case "azw3":
+            mimeType = "application/vnd.amazon.mobi8-ebook"
+        case "cbr":
+            mimeType = "application/vnd.comicbook-rar"
+        case "cbz":
+            mimeType = "application/vnd.comicbook+zip"
+        default:
+            mimeType = "application/epub+zip"
+        }
+        return mimeType
+    }
+}