internal/functions/get-mediafiletypebyfilename.ps1
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<#
.SYNOPSIS Get the media type (MIME type) of a file based on its filename extension. .DESCRIPTION This commandlet retrieves the media type (MIME type) of a file based on its filename extension. The media type is determined by matching the extension to the list of media types (MIME types) from the MIME database https://github.com/jshttp/mime-db .PARAMETER Filename The filename(s) for which to determine the media type. .EXAMPLE PS C:\> Get-MediaTypeByFilename -Filename 'example.jpg' This will return 'image/jpeg' as the media type for the file 'example.jpg'. .NOTES Tags: Media type, MIME type, File extension, Filename Author: Oleksandr Nikolaiev (@onikolaiev) Author: Florian Hopfner (@FH-Inway) #> function Get-MediaTypeByFilename { [CmdletBinding()] param( [Parameter(Mandatory, ValueFromPipeline)] [string[]] $Filename ) begin { # Download and parse the list of media types (MIME types) via # https://github.com/jshttp/mime-db. # NOTE: A fixed release is targeted, to ensure that future changes to the JSON format do not break the command. if (-not (Test-PathExists -Path $Script:MediaTypesPath -Type Leaf -WarningAction SilentlyContinue)) { $mediaTypesFolder = Split-Path -Path $Script:MediaTypesPath -Parent $null = Test-PathExists -Path $mediaTypesFolder -Type Container -Create Invoke-RestMethod -Uri https://cdn.jsdelivr.net/gh/jshttp/mime-db@v1.53.0/db.json -OutFile $Script:MediaTypesPath } $mediaTypes = (Get-Content -Path $Script:MediaTypesPath | ConvertFrom-Json).psobject.Properties } process { foreach ($name in $Filename) { # Find the matching media type by filename extension. $matchingMediaType = $mediaTypes.Where( { $_.Value.extensions -contains [IO.Path]::GetExtension($name).Substring(1) }, 'First' ).Name # Use a fallback type, if no match was found. if (-not $matchingMediaType) { $matchingMediaType = 'application/octet-stream' } $matchingMediaType # output } } } |