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// For complete examples and data files, please go to https://github.com/groupdocs-viewer/GroupDocs.Viewer-for-.NET
public class AmazonCacheDataHandler : ICacheDataHandler
    {
        private static string bucketName = ""; //TODO: Put you bucketname here 
        private readonly ViewerConfig _viewerConfig;
        private readonly AmazonS3Client _client;
        public AmazonCacheDataHandler(ViewerConfig viewerConfig)
        {
            _viewerConfig = viewerConfig;
            _client = new AmazonS3Client(RegionEndpoint.EUWest1);
        }

        public bool Exists(CacheFileDescription cacheFileDescription)
        {
            if (!_viewerConfig.UseCache)
            {
                return false;
            }
            if (cacheFileDescription == null)
            {
                throw new System.Exception("CacheFileDescription is not set");
            } 
            if (string.IsNullOrEmpty(cacheFileDescription.Guid))
            {
                throw new System.Exception("CacheFileDescription is not set");
            }
            if (string.IsNullOrEmpty(_viewerConfig.StoragePath))
            {
                throw new System.Exception("Storage path is not set");
            }
            var key = GetCachePath(_viewerConfig.CachePath, cacheFileDescription);
            S3FileInfo fileInfo = new S3FileInfo(_client, bucketName, key);
            if (!fileInfo.Exists)
            {
                return false;
            }
            return (fileInfo.LastWriteTimeUtc >= DateTime.UtcNow.AddMinutes(-5));
        }
        public Stream GetInputStream(CacheFileDescription cacheFileDescription)
        {
            if (cacheFileDescription == null || String.IsNullOrEmpty(cacheFileDescription.Guid))
            {
                throw new System.Exception("CacheFileDescription is not set");
            }
            var key = GetCachePath(_viewerConfig.CachePath, cacheFileDescription);
            var fileInfo = new S3FileInfo(_client, bucketName, key);
            if (!fileInfo.Exists)
            {
                throw new System.Exception("File not found");
            }
            return fileInfo.OpenRead();
        }
        public Stream GetOutputSaveStream(CacheFileDescription cacheFileDescription)
        {
            try
            {
                if (!_viewerConfig.UseCache)
                {
                    return new MemoryStream();
                }
                if (cacheFileDescription == null || String.IsNullOrEmpty(cacheFileDescription.Guid))
                {
                    throw new System.Exception("CacheFileDescription is not set");
                }
                string key = GetCachePath(_viewerConfig.CachePath, cacheFileDescription);
                S3FileInfo fileInfo = new S3FileInfo(_client, bucketName, key);
                return fileInfo.Create();
            }
            catch (System.Exception e)
            {
                throw new System.Exception(e.Message);
            }
        }
        public string GetCacheUri(CacheFileDescription cacheFileDescription)
        {
            return GetCachePath(_viewerConfig.CachePath, cacheFileDescription);
        }
        private string GetCachePath(string path, CacheFileDescription cacheFileDescription)
        {
            if (cacheFileDescription == null)
            {
                throw new System.Exception("CacheFileDescription is not set");
            }
            string filePath;
            string fileName;
            if (cacheFileDescription != null)
            {
                if (!string.IsNullOrEmpty(cacheFileDescription.Name))
                {

                    fileName = string.Format("{0}.{1}", cacheFileDescription.Name,
                        cacheFileDescription.FileType.ToString().ToLower());

                }
                else
                {
                    fileName = string.Format("{0}.{1}", cacheFileDescription.BaseName,
                             cacheFileDescription.FileType.ToString().ToLower());
                }
                filePath = string.Format(@"{0}\{1}\{2}\", path, cacheFileDescription.Guid, fileName);
            }
            else
            {
                fileName = !string.IsNullOrEmpty(cacheFileDescription.Name)
                ? string.Format("{0}.{1}", cacheFileDescription.Name, cacheFileDescription.FileType.ToString().ToLower())
                : string.Format("{0}.{1}", cacheFileDescription.BaseName, cacheFileDescription.FileType.ToString().ToLower());
                filePath = string.Format(@"{0}\{1}\{2}", path, cacheFileDescription.Guid, fileName);
            }
            return filePath;
        }
        public string GetFilePath(CacheFileDescription cacheFileDescription)
        {
            //TODO: Return File Path
            return "";
        }
        public void ClearCache()
        {
            //TODO: Write Clear Cache code
        }
        public void ClearCache(TimeSpan olderThanDays)
        {
            //TODO: Write Clear Cache with TimeSpan code
        }
        
        public List<CachedPageResourceDescription> GetHtmlPageResources(CachedPageDescription cachePageDescription)
        {
            //TODO: Return Html Page Resources
            return new List<CachedPageResourceDescription>();
        }
        public string GetHtmlPageResourcesFolder(CachedPageDescription cachePageDescription)
        {
            //TODO: Return File Html Resources Folder
            return "<<Html resources folder>>";
        }
        public DateTime? GetLastModificationDate(CacheFileDescription cacheFileDescription)
        {
            //TODO: Return Last Modification Date
            return DateTime.Now;
        }
    }