* Added file chooser to KP2A

* added functionality to file storage interface and (some) implementations to delete files/folders, create folders, list contents
-> Dropbox functionality implemented

src/Kp2aBusinessLogic/Io/BuiltInFileStorage.cs

@@ -30,11 +30,11 @@ namespace keepass2android.Io
 			}
 		}
 
-		public void DeleteFile(IOConnectionInfo ioc)
+		public void Delete(IOConnectionInfo ioc)
 		{
+			//todo check if directory
 			IOConnection.DeleteFile(ioc);
 		}
-
 		public bool CheckForFileChangeFast(IOConnectionInfo ioc, string previousFileVersion)
 		{
 			if (!ioc.IsLocalFile())
@@ -137,5 +137,17 @@ namespace keepass2android.Io
 		{
 			return (!ioc.IsLocalFile()) && (ioc.CredSaveMode != IOCredSaveMode.SaveCred);
 		}
+
+		public void CreateDirectory(IOConnectionInfo ioc)
+		{
+			//TODO
+			throw new NotImplementedException();
+		}
+
+		public IEnumerable<FileDescription> ListContents(IOConnectionInfo ioc)
+		{
+			//TODO
+			throw new NotImplementedException();
+		}
 	}
 }

src/Kp2aBusinessLogic/Io/CachingFileStorage.cs

@@ -88,7 +88,7 @@ namespace keepass2android.Io
 				File.Delete(BaseVersionFilePath(ioc));
 			}
 			
-			_cachedStorage.DeleteFile(ioc);
+			_cachedStorage.Delete(ioc);
 		}
 
 		private string CachedFilePath(IOConnectionInfo ioc)
@@ -105,6 +105,11 @@ namespace keepass2android.Io
 				&& File.Exists(BaseVersionFilePath(ioc));
 		}
 
+		public void Delete(IOConnectionInfo ioc)
+		{
+			_cachedStorage.Delete(ioc);
+		}
+
 		public bool CheckForFileChangeFast(IOConnectionInfo ioc, string previousFileVersion)
 		{
 			//see comment in GetCurrentFileVersionFast
@@ -416,6 +421,16 @@ namespace keepass2android.Io
 			return _cachedStorage.RequiresCredentials(ioc);
 		}
 
+		public void CreateDirectory(IOConnectionInfo ioc)
+		{
+			_cachedStorage.CreateDirectory(ioc);
+		}
+
+		public IEnumerable<FileDescription> ListContents(IOConnectionInfo ioc)
+		{
+			return _cachedStorage.ListContents(ioc);
+		}
+
 
 		public string GetBaseVersionHash(IOConnectionInfo ioc)
 		{

src/Kp2aBusinessLogic/Io/DropboxFileStorage.cs

@@ -22,6 +22,9 @@ namespace keepass2android.Io
 		{
 		}
 
-		public override IEnumerable<string> SupportedProtocols { get { yield return "dropbox"; } }
+		protected override string Protocol
+		{
+			get { return "dropbox"; }
+		}
 	}
 }

src/Kp2aBusinessLogic/Io/FileDescription.cs

@@ -0,0 +1,14 @@
+using System;
+
+namespace keepass2android.Io
+{
+	public class FileDescription
+	{
+		public string Path { get; set; }
+		public bool IsDirectory { get; set; }
+		public DateTime LastModified { get; set; }
+		public bool CanRead { get; set; }
+		public bool CanWrite { get; set; }
+		public long SizeInBytes { get; set; }
+	}
+}

src/Kp2aBusinessLogic/Io/GDriveFileStorage.cs

@@ -17,7 +17,7 @@ namespace keepass2android.Io
 	public class GDriveFileStorage: IFileStorage
 	{
 		public IEnumerable<string> SupportedProtocols { get { yield return "gdrive"; } }
-		public void DeleteFile(IOConnectionInfo ioc)
+		public void Delete(IOConnectionInfo ioc)
 		{
 			throw new NotImplementedException();
 		}
@@ -63,5 +63,15 @@ namespace keepass2android.Io
 		{
 			throw new NotImplementedException();
 		}
+
+		public void CreateDirectory(IOConnectionInfo ioc)
+		{
+			throw new NotImplementedException();
+		}
+
+		public IEnumerable<FileDescription> ListContents(IOConnectionInfo convertPathToIoc)
+		{
+			throw new NotImplementedException();
+		}
 	}
 }

src/Kp2aBusinessLogic/Io/IFileStorage.cs

@@ -36,9 +36,9 @@ namespace keepass2android.Io
 		IEnumerable<string> SupportedProtocols { get; } 
 
 		/// <summary>
-		/// Deletes the given file.
+		/// Deletes the given file or directory.
 		/// </summary>
-		void DeleteFile(IOConnectionInfo ioc);
+		void Delete(IOConnectionInfo ioc);
 
 		/// <summary>
 		/// Tests whether the file was changed. 
@@ -54,7 +54,7 @@ namespace keepass2android.Io
 		/// </summary>
 		/// This string may have a deliberate value (except null) and should not be used by callers except for passing it to
 		/// CheckForFileChangeFast().
-		/// <returns>A string which should not be null.</returns>
+		/// <returns>A string describing the version. Null means, there is no way to get a file version (or it's not implemented).</returns>
 		string GetCurrentFileVersionFast(IOConnectionInfo ioc);
 
 		/// <summary>
@@ -96,6 +96,16 @@ namespace keepass2android.Io
 		/// Returns true if the the given ioc must be filled with username/password
 		/// </summary>
 		bool RequiresCredentials(IOConnectionInfo ioc);
+
+		/// <summary>
+		/// Creates the directory described by ioc
+		/// </summary>
+		void CreateDirectory(IOConnectionInfo ioc);
+
+		/// <summary>
+		/// Lists the contents of the given path
+		/// </summary>
+		IEnumerable<FileDescription> ListContents(IOConnectionInfo ioc);
 	}
 
 	/// <summary>

src/Kp2aBusinessLogic/Io/JavaFileStorage.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
+using System.Linq;
 using Android.App;
 using KeePassLib.Serialization;
 using KeePassLib.Utility;
@@ -12,7 +13,8 @@ namespace keepass2android.Io
 {
 	public abstract class JavaFileStorage: IFileStorage
 	{
-		public abstract IEnumerable<string> SupportedProtocols { get; }
+		public IEnumerable<string> SupportedProtocols { get { yield return Protocol; } }
+
 
 		private readonly IJavaFileStorage _jfs;
 		private readonly IKp2aApp _app;
@@ -23,9 +25,20 @@ namespace keepass2android.Io
 			_app = app;
 		}
 
-		public void DeleteFile(IOConnectionInfo ioc)
+		public void Delete(IOConnectionInfo ioc)
 		{
-			throw new NotImplementedException();
+			try
+			{
+				Jfs.Delete(IocToPath(ioc));
+			}
+			catch (FileNotFoundException e)
+			{
+				throw new System.IO.FileNotFoundException(e.Message, e);
+			}
+			catch (Java.Lang.Exception e)
+			{
+				throw LogAndConvertJavaException(e);
+			}
 		}
 
 		public bool CheckForFileChangeFast(IOConnectionInfo ioc, string previousFileVersion)
@@ -196,14 +209,68 @@ namespace keepass2android.Io
 			return false;
 		}
 
-		private static string IocToPath(IOConnectionInfo ioc)
+		public void CreateDirectory(IOConnectionInfo ioc)
 		{
-			int protocolLength = ioc.Path.IndexOf("://", StringComparison.Ordinal);
-
-			if (protocolLength < 0)
-				return ioc.Path;
-			else
-				return ioc.Path.Substring(protocolLength + 3);
+			try
+			{
+				Jfs.CreateFolder(IocToPath(ioc));
+			}
+			catch (FileNotFoundException e)
+			{
+				throw new System.IO.FileNotFoundException(e.Message, e);
+			}
+			catch (Java.Lang.Exception e)
+			{
+				throw LogAndConvertJavaException(e);
+			}
 		}
+
+		public IEnumerable<FileDescription> ListContents(IOConnectionInfo ioc)
+		{
+			try
+			{
+				IList<JavaFileStorageFileEntry> entries = Jfs.ListFiles(IocToPath(ioc));
+
+				return entries.Select(
+					e => new FileDescription
+						{
+							CanRead = e.CanRead,
+							CanWrite = e.CanWrite,
+							IsDirectory = e.IsDirectory,
+							LastModified = JavaTimeToCSharp(e.LastModifiedTime),
+							Path = Protocol + "://" + e.Path,
+							SizeInBytes = e.SizeInBytes
+						}
+					);
+
+			}
+			catch (FileNotFoundException e)
+			{
+				throw new System.IO.FileNotFoundException(e.Message, e);
+			}
+			catch (Java.Lang.Exception e)
+			{
+				throw LogAndConvertJavaException(e);
+			}
+		}
+
+		private DateTime JavaTimeToCSharp(long javatime)
+		{
+			//todo test
+			return new DateTime(1970, 1, 1).AddMilliseconds(javatime);
+
+		}
+
+		private string IocToPath(IOConnectionInfo ioc)
+		{
+			if (ioc.Path.StartsWith(Protocol + "://"))
+				return ioc.Path.Substring(Protocol.Length + 3);
+			else
+			{
+				return ioc.Path;
+			}
+		}
+
+		protected abstract string Protocol { get; }
 	}
 }