67 lines
2.5 KiB
C#
67 lines
2.5 KiB
C#
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// Licensed to the .NET Foundation under one or more agreements.
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// The .NET Foundation licenses this file to you under the MIT license.
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// See the LICENSE file in the project root for more information.
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using Microsoft.Build.Framework;
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using Microsoft.Build.Utilities;
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using System;
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using System.IO;
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using System.Security.Cryptography;
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namespace Microsoft.DotNet.Build.Tasks
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{
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public class GenerateChecksums : Task
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{
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/// <summary>
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/// An item collection of files for which to generate checksums. Each item must have metadata
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/// 'DestinationPath' that specifies the path of the checksum file to create.
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/// </summary>
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[Required]
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public ITaskItem[] Items { get; set; }
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public override bool Execute()
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{
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foreach (ITaskItem item in Items)
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{
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try
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{
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string destinationPath = item.GetMetadata("DestinationPath");
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if (string.IsNullOrEmpty(destinationPath))
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{
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throw new Exception($"Metadata 'DestinationPath' is missing for item '{item.ItemSpec}'.");
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}
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if (!File.Exists(item.ItemSpec))
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{
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throw new Exception($"The file '{item.ItemSpec}' does not exist.");
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}
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Log.LogMessage(
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MessageImportance.High,
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"Generating checksum for '{0}' into '{1}'...",
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item.ItemSpec,
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destinationPath);
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using (FileStream stream = File.OpenRead(item.ItemSpec))
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{
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HashAlgorithm hashAlgorithm = SHA512.Create();
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byte[] hash = hashAlgorithm.ComputeHash(stream);
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string checksum = BitConverter.ToString(hash).Replace("-", string.Empty);
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File.WriteAllText(destinationPath, checksum);
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}
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}
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catch (Exception e)
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{
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// We have 2 log calls because we want a nice error message but we also want to capture the
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// callstack in the log.
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Log.LogError("An exception occurred while trying to generate a checksum for '{0}'.", item.ItemSpec);
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Log.LogMessage(MessageImportance.Low, e.ToString());
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return false;
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}
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}
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return true;
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}
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}
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}
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