duplicati/Duplicati/CommandLine/BackendTester/Program.cs

// Copyright (C) 2024, The Duplicati Team
// https://duplicati.com, hello@duplicati.com
// 
// Permission is hereby granted, free of charge, to any person obtaining a 
// copy of this software and associated documentation files (the "Software"), 
// to deal in the Software without restriction, including without limitation 
// the rights to use, copy, modify, merge, publish, distribute, sublicense, 
// and/or sell copies of the Software, and to permit persons to whom the 
// Software is furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in 
// all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
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// DEALINGS IN THE SOFTWARE.

using System;
using System.Collections.Generic;
using System.Text;
using Duplicati.Library.Interface;
using System.Linq;
using System.Globalization;
using System.Threading;

namespace Duplicati.CommandLine.BackendTester
{
    public class Program
    {
        /// <summary>
        /// Used to maintain a reference to initialized system settings.
        /// </summary>
        #pragma warning disable CS0414 // The private field `Duplicati.CommandLine.BackendTester.Program.SystemSettings' is assigned but its value is never used
        private static IDisposable SystemSettings;
        #pragma warning restore CS0414 // The private field `Duplicati.CommandLine.BackendTester.Program.SystemSettings' is assigned but its value is never used

        class TempFile
        {
            public readonly string remotefilename;
            public readonly string localfilename;
            public readonly byte[] hash;
            public readonly long length;
            public bool found = false;

            public TempFile(string remotefilename, string localfilename, byte[] hash, long length)
            {
                this.remotefilename = remotefilename;
                this.localfilename = localfilename;
                this.hash = hash;
                this.length = length;
            }
        }

        private const string ValidFilenameChars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ123456789";
        private const string ExtendedChars = "-_',=)(&%$#@! +";

        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        public static int Main(string[] _args)
        {
            try
            {
                if (_args.Length == 1)
                {
                    try
                    {
                        var p = Environment.ExpandEnvironmentVariables(_args[0]);
                        if (System.IO.File.Exists(p))
                            _args = (from x in System.IO.File.ReadLines(p)
                                where !string.IsNullOrWhiteSpace(x) && !x.Trim().StartsWith("#", StringComparison.Ordinal)
                                select x.Trim()
                            ).ToArray();
                    }
                    catch
                    {
                    }
                }

                List<string> args = new List<string>(_args);
                Dictionary<string, string> options = Library.Utility.CommandLineParser.ExtractOptions(args);

                if (args.Count != 1 || String.Equals(args[0], "help", StringComparison.OrdinalIgnoreCase) || args[0] == "?")
                {
                    Console.WriteLine("Usage: <protocol>://<username>:<password>@<path>");
                    Console.WriteLine("Example: ftp://user:pass@server/folder");
                    Console.WriteLine();
                    Console.WriteLine("Supported backends: " + string.Join(",", Duplicati.Library.DynamicLoader.BackendLoader.Keys));

                    Console.WriteLine();
                    List<string> lines = new List<string>();
                    foreach (Library.Interface.ICommandLineArgument arg in SupportedCommands)
                        Library.Interface.CommandLineArgument.PrintArgument(lines, arg);

                    foreach (string s in lines)
                        Console.WriteLine(s);

                    return 0;
                }

                if (options.ContainsKey("tempdir") && !string.IsNullOrEmpty(options["tempdir"]))
                    Library.Utility.SystemContextSettings.DefaultTempPath = options["tempdir"];
                
                SystemSettings = Duplicati.Library.Utility.SystemContextSettings.StartSession();

                if (!options.ContainsKey("auth_password") && !string.IsNullOrEmpty(System.Environment.GetEnvironmentVariable("AUTH_PASSWORD")))
                    options["auth_password"] = System.Environment.GetEnvironmentVariable("AUTH_PASSWORD");

                if (!options.ContainsKey("auth_username") && !string.IsNullOrEmpty(System.Environment.GetEnvironmentVariable("AUTH_USERNAME")))
                    options["auth_username"] = System.Environment.GetEnvironmentVariable("AUTH_USERNAME");

                int reruns = 5;
                if (options.ContainsKey("reruns"))
                    reruns = int.Parse(options["reruns"]);

                for (int i = 0; i < reruns; i++)
                {
                    Console.WriteLine("Starting run no {0}", i);
                    if (!Run(args, options, i == 0))
                        return 1;
                }
                Console.WriteLine("Unittest complete!");
                return 0;
            }
            catch (Exception ex)
            {
                Console.WriteLine("Unittest failed: " + ex);
            }

            return 1;
        }

        static bool Run(List<string> args, Dictionary<string, string> options, bool first)
        {
            Library.Interface.IBackend backend = Library.DynamicLoader.BackendLoader.GetBackend(args[0], options);
            if (backend == null)
            {
                Console.WriteLine("Unsupported backend");
                Console.WriteLine();
                Console.WriteLine("Supported backends: " + string.Join(",", Duplicati.Library.DynamicLoader.BackendLoader.Keys));
                return false;
            }

            string allowedChars = ValidFilenameChars;
            if (options.ContainsKey("extended-chars"))
            {
                allowedChars += String.IsNullOrEmpty(options["extended-chars"]) ? ExtendedChars : options["extended-chars"];
            }

            bool autoCreateFolders = Library.Utility.Utility.ParseBoolOption(options, "auto-create-folder");

            string disabledModulesValue;
            string enabledModulesValue;
            options.TryGetValue("enable-module", out enabledModulesValue);
            options.TryGetValue("disable-module", out disabledModulesValue);
            string[] enabledModules = enabledModulesValue == null ? new string[0] : enabledModulesValue.Trim().ToLower(CultureInfo.InvariantCulture).Split(',');
            string[] disabledModules = disabledModulesValue == null ? new string[0] : disabledModulesValue.Trim().ToLower(CultureInfo.InvariantCulture).Split(',');

            List<Library.Interface.IGenericModule> loadedModules = new List<IGenericModule>();
            foreach (Library.Interface.IGenericModule m in Library.DynamicLoader.GenericLoader.Modules)
                if (!disabledModules.Contains(m.Key, StringComparer.OrdinalIgnoreCase) && (m.LoadAsDefault || enabledModules.Contains(m.Key, StringComparer.OrdinalIgnoreCase)))
                {
                    m.Configure(options);
                    loadedModules.Add(m);
                }

            try
            {
                IEnumerable<Library.Interface.IFileEntry> curlist = null;
                try
                {
                    backend.Test();
                    curlist = backend.List();
                }
                catch (FolderMissingException)
                {
                    if (autoCreateFolders)
                    {
                        try
                        {
                            backend.CreateFolder();
                            curlist = backend.List();
                        }
                        catch (Exception ex)
                        {
                            Console.WriteLine("Autocreate folder failed with message: " + ex.Message);
                        }
                    }

                    if (curlist == null)
                        throw;
                }

                foreach (Library.Interface.IFileEntry fe in curlist)
                    if (!fe.IsFolder)
                    {
                        if (Library.Utility.Utility.ParseBoolOption(options, "auto-clean") && first)
                            if (Library.Utility.Utility.ParseBoolOption(options, "force"))
                            {
                                Console.WriteLine("Auto clean, removing file: {0}", fe.Name);
                                backend.Delete(fe.Name);
                                continue;
                            }
                            else
                                Console.WriteLine("Specify the --force flag to actually delete files");

                        Console.WriteLine("*** Remote folder is not empty, aborting");
                        return false;
                    }


                int number_of_files = 10;
                int min_file_size = 1024;
                int max_file_size = 1024 * 1024 * 50;
                int min_filename_size = 5;
                int max_filename_size = 80;
                bool disableStreaming = Library.Utility.Utility.ParseBoolOption(options, "disable-streaming-transfers");
                bool skipOverwriteTest = Library.Utility.Utility.ParseBoolOption(options, "skip-overwrite-test");
                bool trimFilenameSpaces = Library.Utility.Utility.ParseBoolOption(options, "trim-filename-spaces");

                long throttleUpload = 0;
                if (options.TryGetValue("throttle-upload", out string throttleUploadString))
                {
                    if (!(backend is IStreamingBackend) || disableStreaming)
                    {
                        Console.WriteLine("Warning: Throttling is only supported in this tool on streaming backends");
                    }

                    throttleUpload = Duplicati.Library.Utility.Sizeparser.ParseSize(throttleUploadString, "kb");
                }

                long throttleDownload = 0;
                if (options.TryGetValue("throttle-download", out string throttleDownloadString))
                {
                    if (!(backend is IStreamingBackend) || disableStreaming)
                    {
                        Console.WriteLine("Warning: Throttling is only supported in this tool on streaming backends");
                    }

                    throttleDownload = Duplicati.Library.Utility.Sizeparser.ParseSize(throttleDownloadString, "kb");
                }

                if (options.ContainsKey("number-of-files"))
                    number_of_files = int.Parse(options["number-of-files"]);
                if (options.ContainsKey("min-file-size"))
                    min_file_size = (int)Duplicati.Library.Utility.Sizeparser.ParseSize(options["min-file-size"], "mb");
                if (options.ContainsKey("max-file-size"))
                    max_file_size = (int)Duplicati.Library.Utility.Sizeparser.ParseSize(options["max-file-size"], "mb");

                if (options.ContainsKey("min-filename-length"))
                    min_filename_size = int.Parse(options["min-filename-length"]);
                if (options.ContainsKey("max-filename-length"))
                    max_filename_size = int.Parse(options["max-filename-length"]);

                Random rnd = new Random();
                System.Security.Cryptography.SHA256 sha = System.Security.Cryptography.SHA256.Create();

                //Create random files
                using (Library.Utility.TempFolder tf = new Duplicati.Library.Utility.TempFolder())
                {
                    List<TempFile> files = new List<TempFile>();
                    for (int i = 0; i < number_of_files; i++)
                    {
                        string filename = CreateRandomRemoteFileName(min_filename_size, max_filename_size, allowedChars, trimFilenameSpaces, rnd);

                        string localfilename = CreateRandomFile(tf, i, min_file_size, max_file_size, rnd);

                        //Calculate local hash and length
                        using (System.IO.FileStream fs = new System.IO.FileStream(localfilename, System.IO.FileMode.Open, System.IO.FileAccess.Read))
                            files.Add(new TempFile(filename, localfilename, sha.ComputeHash(fs), fs.Length));
                    }

                    byte[] dummyFileHash = null;
                    if (!skipOverwriteTest)
                    {
                        Console.WriteLine("Uploading wrong files ...");
                        using (Library.Utility.TempFile dummy = Library.Utility.TempFile.WrapExistingFile(CreateRandomFile(tf, files.Count, 1024, 2048, rnd)))
                        {
                            using (System.IO.FileStream fs = new System.IO.FileStream(dummy, System.IO.FileMode.Open, System.IO.FileAccess.Read))
                                dummyFileHash = sha.ComputeHash(fs);

                            //Upload a dummy file for entry 0 and the last one, they will be replaced by the real files afterwards
                            //We upload entry 0 twice just to try to freak any internal cache list
                            Uploadfile(dummy, 0, files[0].remotefilename, backend, disableStreaming, throttleUpload);
                            Uploadfile(dummy, 0, files[0].remotefilename, backend, disableStreaming, throttleUpload);
                            Uploadfile(dummy, files.Count - 1, files[files.Count - 1].remotefilename, backend, disableStreaming, throttleUpload);
                        }

                    }

                    Console.WriteLine("Uploading files ...");

                    for (int i = 0; i < files.Count; i++)
                        Uploadfile(files[i].localfilename, i, files[i].remotefilename, backend, disableStreaming, throttleUpload);

                    TempFile originalRenamedFile = null;
                    string renamedFileNewName = null;
                    IRenameEnabledBackend renameEnabledBackend = backend as IRenameEnabledBackend;
                    if (renameEnabledBackend != null)
                    {
                        // Rename the second file in the list, if there are more than one. If not, just do the first one.
                        int renameIndex = files.Count > 1 ? 1 : 0;
                        originalRenamedFile = files[renameIndex];

                        renamedFileNewName = CreateRandomRemoteFileName(min_filename_size, max_filename_size, allowedChars, trimFilenameSpaces, rnd);

                        Console.WriteLine("Renaming file {0} from {1} to {2}", renameIndex, originalRenamedFile.remotefilename, renamedFileNewName);

                        renameEnabledBackend.Rename(originalRenamedFile.remotefilename, renamedFileNewName);
                        files[renameIndex] = new TempFile(renamedFileNewName, originalRenamedFile.localfilename, originalRenamedFile.hash, originalRenamedFile.length);
                    }

                    Console.WriteLine("Verifying file list ...");

                    curlist = backend.List();
                    foreach (Library.Interface.IFileEntry fe in curlist)
                        if (!fe.IsFolder)
                        {
                            bool found = false;
                            foreach (TempFile tx in files)
                                if (tx.remotefilename == fe.Name)
                                {
                                    if (tx.found)
                                        Console.WriteLine("*** File with name {0} was found more than once", tx.remotefilename);
                                    found = true;
                                    tx.found = true;

                                    if (fe.Size > 0 && tx.length != fe.Size)
                                        Console.WriteLine("*** File with name {0} has size {1} but the size was reported as {2}", tx.remotefilename, tx.length, fe.Size);

                                    break;
                                }

                            if (!found)
                                if (originalRenamedFile != null && renamedFileNewName != null && originalRenamedFile.remotefilename == fe.Name)
                                {
                                    Console.WriteLine("*** File with name {0} was found on server but was supposed to have been renamed to {1}!", fe.Name, renamedFileNewName);
                                }
                                else
                                {
                                    Console.WriteLine("*** File with name {0} was found on server but not uploaded!", fe.Name);
                                }
                        }

                    foreach (TempFile tx in files)
                        if (!tx.found)
                            Console.WriteLine("*** File with name {0} was uploaded but not found afterwards", tx.remotefilename);

                    Console.WriteLine("Downloading files");

                    for (int i = 0; i < files.Count; i++)
                    {
                        using (Duplicati.Library.Utility.TempFile cf = new Duplicati.Library.Utility.TempFile())
                        {
                            Exception e = null;
                            Console.Write("Downloading file {0} ... ", i);

                            try
                            {
                                if (backend is IStreamingBackend streamingBackend && !disableStreaming)
                                {
                                    using (System.IO.FileStream fs = new System.IO.FileStream(cf, System.IO.FileMode.Create, System.IO.FileAccess.Write, System.IO.FileShare.None))
                                    using (Library.Utility.ThrottledStream ts = new Library.Utility.ThrottledStream(fs, throttleDownload, throttleDownload))
                                    using (NonSeekableStream nss = new NonSeekableStream(ts))
                                        streamingBackend.Get(files[i].remotefilename, nss);
                                }
                                else
                                    backend.Get(files[i].remotefilename, cf);

                                e = null;
                            }
                            catch (Exception ex)
                            {
                                e = ex;
                            }

                            if (e != null)
                                Console.WriteLine("failed\n*** Error: {0}", e);
                            else
                                Console.WriteLine("done");

                            Console.Write("Checking hash ... ");

                            using (System.IO.FileStream fs = new System.IO.FileStream(cf, System.IO.FileMode.Open, System.IO.FileAccess.Read))
                                if (Convert.ToBase64String(sha.ComputeHash(fs)) != Convert.ToBase64String(files[i].hash))
                                {
                                    if (dummyFileHash != null && Convert.ToBase64String(sha.ComputeHash(fs)) == Convert.ToBase64String(dummyFileHash))
                                        Console.WriteLine("failed\n*** Downloaded file was the dummy file");
                                    else
                                        Console.WriteLine("failed\n*** Downloaded file was corrupt");
                                }
                                else
                                    Console.WriteLine("done");
                        }
                    }

                    Console.WriteLine("Deleting files...");

                    foreach (TempFile tx in files)
                        try { backend.Delete(tx.remotefilename); }
                        catch (Exception ex)
                        {
                            Console.WriteLine("*** Failed to delete file {0}, message: {1}", tx.remotefilename, ex);
                        }

                    curlist = backend.List();
                    foreach (Library.Interface.IFileEntry fe in curlist)
                        if (!fe.IsFolder)
                        {
                            Console.WriteLine("*** Remote folder contains {0} after cleanup", fe.Name);
                        }

                    // Test some error cases
                    Console.WriteLine("Checking retrieval of non-existent file...");
                    bool caughtExpectedException = false;
                    try
                    {
                        using (Duplicati.Library.Utility.TempFile tempFile = new Duplicati.Library.Utility.TempFile())
                        {
                            backend.Get(string.Format("NonExistentFile-{0}", Guid.NewGuid()), tempFile.Name);
                        }
                    }
                    catch (FileMissingException)
                    {
                        Console.WriteLine("Caught expected FileMissingException");
                        caughtExpectedException = true;
                    }
                    catch (Exception ex)
                    {
                        Console.WriteLine("*** Retrieval of non-existent file failed: {0}", ex);
                    }

                    if (!caughtExpectedException)
                    {
                        Console.WriteLine("*** Retrieval of non-existent file should have failed with FileMissingException");
                    }
                }

                // Test quota retrieval
                IQuotaEnabledBackend quotaEnabledBackend = backend as IQuotaEnabledBackend;
                if (quotaEnabledBackend != null)
                {
                    Console.WriteLine("Checking quota...");
                    IQuotaInfo quota = null;
                    bool noException;
                    try
                    {
                        quota = quotaEnabledBackend.Quota;
                        noException = true;
                    }
                    catch (Exception ex)
                    {
                        Console.WriteLine("*** Checking quota information failed: {0}", ex);
                        noException = false;
                    }

                    if (noException)
                    {
                        if (quota != null)
                        {
                            Console.WriteLine("Free Space:  {0}", Library.Utility.Utility.FormatSizeString(quota.FreeQuotaSpace));
                            Console.WriteLine("Total Space: {0}", Library.Utility.Utility.FormatSizeString(quota.TotalQuotaSpace));
                        }
                        else
                        {
                            Console.WriteLine("Unable to retrieve quota information");
                        }
                    }
                }

                // Test DNSName lookup
                Console.WriteLine("Checking DNS names used by this backend...");
                try
                {
                    string[] dnsNames = backend.DNSName;
                    if (dnsNames != null)
                    {
                        foreach (string dnsName in dnsNames)
                        {
                            Console.WriteLine(dnsName);
                        }
                    }
                    else
                    {
                        Console.WriteLine("No DNS names reported");
                    }
                }
                catch (Exception ex)
                {
                    Console.WriteLine("*** Checking DNSName failed: {0}", ex);
                }
            }
            finally
            {
                foreach (Library.Interface.IGenericModule m in loadedModules)
                    if (m is IDisposable disposable)
                        disposable.Dispose();
            }

            return true;
        }

        private static void Uploadfile(string localfilename, int i, string remotefilename, IBackend backend, bool disableStreaming, long throttle)
        {
            Console.Write("Uploading file {0}, {1} ... ", i, Duplicati.Library.Utility.Utility.FormatSizeString(new System.IO.FileInfo(localfilename).Length));
            Exception e = null;

            try
            {
                if (backend is IStreamingBackend streamingBackend && !disableStreaming)
                {
                    using (System.IO.FileStream fs = new System.IO.FileStream(localfilename, System.IO.FileMode.Open, System.IO.FileAccess.Read, System.IO.FileShare.Read))
                    using (Library.Utility.ThrottledStream ts = new Library.Utility.ThrottledStream(fs, throttle, throttle))
                    using (NonSeekableStream nss = new NonSeekableStream(ts))
                        streamingBackend.PutAsync(remotefilename, nss, CancellationToken.None).Wait();
                }
                else
                    backend.PutAsync(remotefilename, localfilename, CancellationToken.None).Wait();

                e = null;
            }
            catch (Exception ex)
            {
                e = ex;
            }

            if (e != null)
            {
                Console.WriteLine("Failed to upload file {0}, error message: {1}, remote name: {2}", i, e, remotefilename);
                while (e.InnerException != null)
                {
                    e = e.InnerException;
                    Console.WriteLine("  Inner exception: {0}", e);
                }
            }
            else
            {
                Console.WriteLine(" done!");
            }
        }

        private static string CreateRandomRemoteFileName(int min_filename_size, int max_filename_size, string allowedChars, bool trimFilenameSpaces, Random rnd)
        {
            StringBuilder filenameBuilder = new StringBuilder();
            int filenamelen = rnd.Next(min_filename_size, max_filename_size);
            for (int j = 0; j < filenamelen; j++)
                filenameBuilder.Append(allowedChars[rnd.Next(0, allowedChars.Length)]);

            string filename = filenameBuilder.ToString();
            if (trimFilenameSpaces)
                filename = filename.Trim();

            return filename;
        }

        private static string CreateRandomFile(Library.Utility.TempFolder tf, int i, int min_file_size, int max_file_size, Random rnd)
        {
            Console.Write("Generating file {0}", i);
            string filename = System.IO.Path.Combine(tf, i.ToString());
            using (System.IO.FileStream fs = new System.IO.FileStream(filename, System.IO.FileMode.CreateNew, System.IO.FileAccess.Write))
            {
                //Random size
                byte[] buf = new byte[1024];
                int size = rnd.Next(min_file_size, max_file_size);

                Console.WriteLine(" ({0})", Duplicati.Library.Utility.Utility.FormatSizeString(size));

                while (size > 0)
                {
                    rnd.NextBytes(buf);
                    fs.Write(buf, 0, Math.Min(buf.Length, size));
                    size -= buf.Length;
                }
            }

            return filename;
        }

        public static IList<ICommandLineArgument> SupportedCommands
        {
            get
            {
                return new List<ICommandLineArgument>(new ICommandLineArgument[] {
                    new CommandLineArgument("reruns", CommandLineArgument.ArgumentType.Integer, "The number of test runs to perform", "A number that describes how many times the test is performed", "5"),
                    new CommandLineArgument("tempdir", CommandLineArgument.ArgumentType.Path, "The path used to store temporary files", "The backend tester will use the system default temp path. You can set this option to choose another path."),
                    new CommandLineArgument("extended-chars", CommandLineArgument.ArgumentType.String, "A list of allowed extended filename chars", "A list of characters besides {a-z, A-Z, 0-9} to use when generating filenames", ExtendedChars),
                    new CommandLineArgument("number-of-files", CommandLineArgument.ArgumentType.Integer, "The number of files to test with", "An integer describing how many files to upload during a test run", "10"),
                    new CommandLineArgument("min-file-size", CommandLineArgument.ArgumentType.Size, "The minimum allowed file size", "File sizes are chosen at random, this value is the lower bound", "1kb"),
                    new CommandLineArgument("max-file-size", CommandLineArgument.ArgumentType.Size, "The maximum allowed file size", "File sizes are chosen at random, this value is the upper bound", "50mb"),
                    new CommandLineArgument("min-filename-length", CommandLineArgument.ArgumentType.Integer, "The minimum allowed filename length", "File name lengths are chosen at random, this value is the lower bound", "5"),
                    new CommandLineArgument("max-filename-length", CommandLineArgument.ArgumentType.Integer, "The minimum allowed filename length", "File name lengths are chosen at random, this value is the upper bound", "80"),
                    new CommandLineArgument("trim-filename-spaces", CommandLineArgument.ArgumentType.Boolean, "Trims whitespace from filenames", "A value that indicates if whitespace should be trimmed from the ends of randomly generated filenames", "false"),
                    new CommandLineArgument("auto-create-folder", CommandLineArgument.ArgumentType.Boolean, "Allows automatic folder creation", "A value that indicates if missing folders are created automatically", "false"),
                    new CommandLineArgument("skip-overwrite-test", CommandLineArgument.ArgumentType.Boolean, "Bypasses the overwrite test", "A value that indicates if dummy files should be uploaded prior to uploading the real files", "false"),
                    new CommandLineArgument("auto-clean", CommandLineArgument.ArgumentType.Boolean, "Removes any files found in target folder", "A value that indicates if all files in the target folder should be deleted before starting the first test", "false"),
                    new CommandLineArgument("force", CommandLineArgument.ArgumentType.Boolean, "Activates file deletion", "A value that indicates if existing files should really be deleted when using auto-clean", "false"),
                });
            }
        }
    }
}