Download secure file with PowerShell - powershell

Question

I'm trying to create a new release task for VSTS which needs to download a secure file from the library. However, when I run the following PowerShell script no secure files are displayed but there are two in there. Could this be not having enough rights? What should be changed.
Another question: when I'm able to list the secure files I want to download a specific one. I haven't found any examples on how to do that. Does anyone know of an example?
$url = "$($env:SYSTEM_TEAMFOUNDATIONCOLLECTIONURI)$env:SYSTEM_TEAMPROJECTID/_apis/distributedtask/securefiles"
Write-Host "URL: $url"
$secureFiles = Invoke-RestMethod -Uri $url -Headers #{
Authorization = "Bearer $env:SYSTEM_ACCESSTOKEN"
}
Write-Host "SecureFiles: $secureFiles"

Answer 1

I was able to download Secure Files using a REST API, the task's Access Token, and an Accept header for application/octet-stream. I enabled "Allow scripts to access the OAuth token". Here my task.json is using a secureFile named "SecureFile."
$secFileId = Get-VstsInput -Name SecureFile -Require
$secTicket = Get-VstsSecureFileTicket -Id $secFileId
$secName = Get-VstsSecureFileName -Id $secFileId
$tempDirectory = Get-VstsTaskVariable -Name "Agent.TempDirectory" -Require
$collectionUrl = Get-VstsTaskVariable -Name "System.TeamFoundationCollectionUri" -Require
$project = Get-VstsTaskVariable -Name "System.TeamProject" -Require
$filePath = Join-Path $tempDirectory $secName
$token= Get-VstsTaskVariable -Name "System.AccessToken" -Require
$user = Get-VstsTaskVariable -Name "Release.RequestedForId" -Require
$base64AuthInfo = [Convert]::ToBase64String([Text.Encoding]::ASCII.GetBytes(("{0}:{1}" -f $User, $token)))
$headers = #{
Authorization=("Basic {0}" -f $base64AuthInfo)
Accept="application/octet-stream"
}
Invoke-RestMethod -Uri "$($collectionUrl)$project/_apis/distributedtask/securefiles/$($secFileId)?ticket=$($secTicket)&download=true&api-version=5.0-preview.1" -Headers $headers -OutFile $filePath
I am using "$(Build.QueuedById)" to get the user id in build tasks, but honestly I don't think it matters what string you use there.
If you don't have the Accept header, you'll get JSON metadata back for the file you're attempting to download.
Unfortunately I cobbled this together from other SO posts and the github issues pages; I can't find anywhere official that documents the URL I'm using there.

Answer 2

There has no such REST API to download secure file, but you can use Download secure file task for assistants.
And since the secure file only exist in temporary location during build, you should download the secure file by Download secure file task firstly, and copy the secure file to another directory secondly:
1. Download secure file
You can add a Download secure file task (for VSTS) and specify the filename to download.
Note: since the task is not available for TFS, you can install the similar task like Download Secure File extension for your TFS account.
2. Copy secure file to another directory
Such as copy the secure file to $(Build.ArtifactStagingDirectory), you can use PowerShell script:
Copy-Item -Path $(Agent.WorkFolder)\_temp\filename -Destination $(Build.ArtifactStagingDirectory)
Or use Copy Files task to copy the secure file to $(Build.ArtifactStagingDirectory).
BTW:
Since you are using Download Secure File task (developed by Matt Labrum) which can only select secure file from DropDownList (variables can not be used). But there has an issue Enable to use a variable to specify the secure file to download which suggests this feature, you can follow up.
And for the REST API to download secure file, it's not available for now. But there has an user voice Access "Secure files" from .NET client library, and you can vote and follow up.