Improving git browsing

MatterControlLib/Library/Providers/GitHub/GitHubLibraryItem.cs

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+/*
+Copyright (c) 2019, John Lewin
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice, this
+   list of conditions and the following disclaimer.
+2. Redistributions in binary form must reproduce the above copyright notice,
+   this list of conditions and the following disclaimer in the documentation
+   and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+The views and conclusions contained in the software and documentation are those
+of the authors and should not be interpreted as representing official policies,
+either expressed or implied, of the FreeBSD Project.
+*/
+
+using MatterHackers.Localizations;
+using MatterHackers.MatterControl.DataStorage;
+using Newtonsoft.Json;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Net;
+using System.Net.Http;
+using System.Threading.Tasks;
+
+namespace MatterHackers.MatterControl.Library
+{
+	public class GitHubLibraryItem : ILibraryAssetStream
+	{
+		public GitHubLibraryItem(string name, string url)
+		{
+			this.Name = name;
+			this.Url = url;
+		}
+
+		public string AssetPath => CachePath;
+
+		public string Category { get; set; }
+
+		public string ContentType => Path.GetExtension(Url);
+
+		public DateTime DateCreated { get; } = DateTime.Now;
+
+		public DateTime DateModified { get; } = DateTime.Now;
+
+		public string FileName => Name;
+
+		public long FileSize { get; private set; }
+
+		public string ID { get; set; }
+
+		public bool IsLocked { get; internal set; }
+
+		public bool IsProtected { get; internal set; }
+
+		public bool IsVisible => true;
+
+		public virtual bool LocalContentExists => File.Exists(CachePath);
+
+		public string Name { get; set; }
+		public string Url { get; }
+		public string ThumbnailUrl { get; internal set; }
+
+		private string CachePath => GetLibraryPath(FileKey, FileExtension);
+
+		public string FileKey { get; private set; }
+
+		public string FileExtension { get; private set; }
+
+		public static string GetLibraryPath(string fileKey, string fileExtension)
+		{
+			return Path.Combine(ApplicationDataStorage.Instance.CloudLibraryPath, $"{fileKey}.{fileExtension}");
+		}
+
+		public async Task<StreamAndLength> GetStream(Action<double, string> reportProgress)
+		{
+			if (!this.LocalContentExists)
+			{
+				// Acquire the content if missing
+				await DownloadDigitalItem(reportProgress, CachePath);
+			}
+
+			if (File.Exists(CachePath))
+			{
+				var stream = File.OpenRead(CachePath);
+
+				return new StreamAndLength()
+				{
+					Length = (int)stream.Length,
+					Stream = stream
+				};
+			}
+
+			return null;
+		}
+
+		private async Task<string> DownloadDigitalItem(Action<double, string> reportProgress, string libraryFilePath)
+		{
+			string url = "";
+
+			// Check for library cache file and download if missing
+			if (!File.Exists(libraryFilePath))
+			{
+				// Get a temporary path to write to during download. If we complete without error, swap this file into the libraryFilePath path
+				string tempFilePath = ApplicationDataStorage.Instance.GetTempFileName(FileExtension);
+
+				using (var writeStream = File.Create(tempFilePath))
+				{
+					await DownloadWithProgress(url, writeStream, reportProgress);
+				}
+
+				reportProgress?.Invoke(0, "");
+
+				// Ensure the target directory exists. The AboutWidget.RemoveDirectory logic may remove the Library
+				// directory at runtime during cache purge
+				Directory.CreateDirectory(Path.GetDirectoryName(libraryFilePath));
+
+				// Delete the target file if necessary
+				if (File.Exists(libraryFilePath))
+				{
+					File.Delete(libraryFilePath);
+				}
+
+				// Move the downloaded file to the target path
+				File.Move(tempFilePath, libraryFilePath);
+			}
+
+			return libraryFilePath;
+		}
+
+		private async Task DownloadWithProgress(string url, FileStream fileStream, Action<double, string> reportProgress)
+		{
+			try
+			{
+				// get the file contents;
+				HttpRequestMessage downLoadUrl = new HttpRequestMessage(HttpMethod.Get, url);
+				GitHubContainer.AddCromeHeaders(downLoadUrl);
+
+				string content = "";
+				using (HttpClient client = new HttpClient())
+				{
+					using (HttpResponseMessage contentResponse = await client.SendAsync(downLoadUrl))
+					{
+						content = await contentResponse.Content.ReadAsStringAsync();
+					}
+				}
+			}
+			catch
+			{
+				// Previous code swallowed errors, doing the same for now
+			}
+		}
+	}
+}