libks/win/downloadpackage.task

<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
  <ImportGroup Label="PropertySheets">
    <Import Project="basedir.props" Condition=" '$(BaseDirImported)' == ''"/>
  </ImportGroup>

  <UsingTask TaskName="DownloadPackageTask" 
             TaskFactory="CodeTaskFactory"  
             AssemblyFile="$(MSBuildToolsPath)\Microsoft.Build.Tasks.v4.0.dll" >  
             <ParameterGroup>  
                <package Required="true" />   
                <expectfileordirectory Required="true" />   
                <outputfolder />   
                <outputfilename />   
                <extractto />   
             </ParameterGroup>  
             <Task>  
                <Reference Include="Microsoft.Build" />
                <Reference Include="Microsoft.Build.Framework" />
                <Reference Include="Microsoft.Build.Utilities.Core" />
                <Code Type="Class" Language="cs">
<![CDATA[  
using System;
using System.IO;
using System.Threading;
using Microsoft.Build.Framework;
using System.Reflection;
using Microsoft.Build.Execution;
using System.Net;
using System.ComponentModel;
using System.Diagnostics;

    public class DownloadPackageTask : Microsoft.Build.Utilities.Task, Microsoft.Build.Framework.ICancelableTask
    {
        public class State
        {
            public string filename;
            public int progress;
        }

        protected ManualResetEvent TaskCanceled { get; private set; }
        public void Cancel()
        {
            TaskCanceled.Set();
        }

        private string basedir;

        [Required]
        public string package { get; set; }
        [Required]
        public string expectfileordirectory { get; set; }

        public string outputfolder { get; set; }
        public string outputfilename { get; set; }
        public string extractto { get; set; }

        internal static bool FileOrDirectoryExists(string name)
        {
            return (Directory.Exists(name) || File.Exists(name));
        }

        public override bool Execute()
        {
            basedir = Path.GetFullPath(@"$(BaseDir)");

            TaskCanceled = new ManualResetEvent(false);

            Log.LogMessage(MessageImportance.High,
                 "Checking for package \"" + package + "\".");          

            //Log.LogMessage(MessageImportance.High,
            //    "BaseDir \"" + basedir + "\"");

            //Log.LogMessage(MessageImportance.High,
            //    "expectfileordirectory \"" + expectfileordirectory + "\"");
            
            string librarypath = basedir;

            Mutex m = new Mutex(false, Path.Combine(librarypath, package).Replace(":", "/").Replace("\\","/"));

            m.WaitOne();

            if (FileOrDirectoryExists(expectfileordirectory))
            {
                Log.LogMessage(MessageImportance.High,
                    "Package \"" + package + "\" exists. Do nothing.");
            }
            else
            {               
                Log.LogMessage(MessageImportance.High,
                    "Start downloading package \"" + package + "\".");

                using (var client = new System.Net.WebClient())
                {
                    Uri uri = new Uri(package);
                    string urifilename = Path.GetFileName(uri.LocalPath);
                    string output = Path.Combine(outputfolder ?? librarypath, (outputfilename ?? urifilename));

                    //if (!File.Exists(output)) // Uncomment to skip download if exists
                    {
                        var syncObject = new State
                        {
                            filename = urifilename,
                            progress = -1
                        };
                        lock (syncObject)
                        {
                            client.DownloadFileCompleted += new AsyncCompletedEventHandler(DownloadFileCompleted);
                            client.DownloadProgressChanged += new DownloadProgressChangedEventHandler(DownloadProgressCallback);
                            client.DownloadFileAsync(uri, output, syncObject);

                Log.LogMessage(MessageImportance.High,
                    "uri: \"" + uri + "\".");
                Log.LogMessage(MessageImportance.High,
                    "output: \"" + output + "\".");

                            while (!Monitor.Wait(syncObject, 1000))
                            {
                                if (TaskCanceled.WaitOne(0))
                                {
                                    client.CancelAsync();
                                    Monitor.Wait(syncObject);

                                    if (File.Exists(output))
                                    {
                                        Log.LogMessage(MessageImportance.High,
                                            "Deleting incomplete file " + output + " for package \"" + package + "\".");
                                        File.Delete(output);
                                    }

                                    Log.LogMessage(MessageImportance.High,
                                            "Downloading canceled for package \"" + package + "\".");

                                    break;
                                }
                            }
                        }
                    }

                    if (File.Exists(output))
                    {
                        // Successful download.
                        if (Path.GetExtension(output) != ".exe")
                        {
                            Extract(output);
                            string filename = Path.Combine(Path.GetDirectoryName(output), Path.GetFileNameWithoutExtension(output));
                            Log.LogMessage(MessageImportance.High,
                                "Filename \"" + filename + "\".");

                            if (File.Exists(filename))
                            {
                                Extract(filename);
                                File.Delete(filename);
                            }
                        }
                    }
                }

                if (!TaskCanceled.WaitOne(0))
                {
                    Log.LogMessage(MessageImportance.High,
                        "Downloading finished for package \"" + package + "\".");
                }
            }

            m.ReleaseMutex();

            return true;
        }

        private void Extract(string filename)
        {
            string extracttofolder = Path.GetFullPath((extractto ?? Path.GetDirectoryName(filename)) + "/");

            string arctool = Path.Combine(new string[] { basedir, "7za1701.exe" });
            string args = " x \"" + filename + "\" -y -o\"" + extracttofolder + "\"";

            Log.LogMessage(MessageImportance.High,
                  "arctool : " + arctool);
            Log.LogMessage(MessageImportance.High,
                  "args : " + args);
            Log.LogMessage(MessageImportance.High,
                  "WorkingDirectory : " + Path.GetDirectoryName(arctool));                    

            var proc = new Process
            {
                StartInfo = new ProcessStartInfo
                {
                    FileName = arctool,
                    Arguments = args,
                    UseShellExecute = false,
                    RedirectStandardOutput = true,
                    CreateNoWindow = true,
                    WorkingDirectory = Path.GetDirectoryName(arctool)
                }
            };

            proc.Start();

            while (!proc.StandardOutput.EndOfStream)
            {
                string line = proc.StandardOutput.ReadLine();

                Log.LogMessage(MessageImportance.High,
                    Path.GetFileName(filename) + " : " + line);

                if (TaskCanceled.WaitOne(0))
                {
                    proc.Kill();
                    break;
                }
            }

            proc.WaitForExit();
        }

        private void DownloadFileCompleted(object sender, AsyncCompletedEventArgs e)
        {
            lock (e.UserState)
            {
                //releases blocked thread
                Monitor.Pulse(e.UserState);
            }
        }

        private string humanSize(double len)
        {
            string[] sizes = { "B", "KB", "MB", "GB", "TB" };
            int order = 0;

            while (len >= 1024 && order < sizes.Length - 1)
            {
                order++;
                len = len / 1024;
            }

            return String.Format("{0:0.##} {1}", len, sizes[order]);
        }

        private void DownloadProgressCallback(object sender, DownloadProgressChangedEventArgs e)
        {
            if (((State)e.UserState).progress < e.ProgressPercentage)
            {
                ((State)e.UserState).progress = e.ProgressPercentage;

                // Displays the transfer progress.
                Log.LogMessage(MessageImportance.High, ((State)e.UserState).filename + " : downloaded " + humanSize(e.BytesReceived) + " of " + humanSize(e.TotalBytesToReceive) + " " + e.ProgressPercentage + " % complete...");
            }
        }
    }
]]>  
                </Code>  
             </Task>  
  </UsingTask>  

  <Target Name="7za" BeforeTargets="Build">  
      <DownloadPackageTask 
          package="http://files.freeswitch.org/downloads/win32/7za1701.exe" 
          expectfileordirectory="$(BaseDir)7za1701.exe" 
          outputfolder="$(BaseDir)" 
          outputfilename="7za1701.exe"
          extractto=""
      />
  </Target> 

  <PropertyGroup>
    <downloadpackagetask_Imported>true</downloadpackagetask_Imported>
  </PropertyGroup>

</Project>