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A powershell module to keep a remote file up to date with a local copy via etag; e.g. IP lists
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| function Invoke-FileDownload { | |
| param( | |
| [Parameter(Mandatory=$true)] | |
| [string]$Uri, | |
| [Parameter(Mandatory=$true)] | |
| [string]$OutFile, | |
| [Parameter(Mandatory=$false)] | |
| [hashtable]$Headers | |
| ) | |
| $file = $Url -replace 'http(s)?://' -replace '/', '_' | |
| $content = Invoke-WebRequest -Uri $Uri -Method Head -UseBasicParsing | |
| if ($content.Headers.Etag) { | |
| $TEMP = [System.Environment]::GetEnvironmentVariable('TEMP', 'Machine') | |
| if (Test-Path "$TEMP/$file.etag") { | |
| $storedtag = Get-Content "$TEMP/$file.etag" | |
| if ($storedtag -eq $content.Headers.Etag) { | |
| Write-Host "Etag is the same, no need to redownload!" | |
| } else { | |
| Write-Host "Etag changed! Redownloading content. Old Etag: $($storedtag), New Etag: $($content.Headers.Etag)" | |
| Invoke-WebRequest -Uri "$Uri" -UseBasicParsing -OutFile "$OutFile" -Headers $Headers | |
| Set-Content "$TEMP/$file.etag" -Value $content.Headers.Etag -NoNewline | |
| } | |
| } else { | |
| Write-Host "No Etag file found!" | |
| Invoke-WebRequest -Uri "$Uri" -UseBasicParsing -OutFile "$OutFile" -Headers $Headers | |
| Set-Content "$TEMP/$file.etag" -Value $content.Headers.Etag -NoNewline | |
| } | |
| } else { | |
| Write-Host "Server provided no Etag!" | |
| Invoke-WebRequest -Uri "$Uri" -UseBasicParsing -OutFile "$OutFile" -Headers $Headers | |
| } | |
| } |
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