src/assemblyhelper.ps1
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# Copyright 2019, Adam Edwards # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. function __IsDesktopEdition { $PSVersionTable.PSEdition -eq 'Desktop' } function FindAssembly($assemblyRoot, $assemblyName, $platformSpec) { write-verbose "Looking for matching assembly for '$assemblyName' under path '$assemblyRoot' with platform '$platformSpec'" # For OS compatibility, canonicalize path separators below by replacing '\' with '/' $matchingAssemblyPaths = get-childitem -r $assemblyRoot -Filter "$assemblyName.dll" | where { $assemblyDirectory = $_.fullname $components = $assemblyDirectory.replace("`\", "/") -split "/" if ( $components.length -ge 3 ) { ($components[$components.length - 2] -eq $platformSpec) -and ($components[$components.length - 3] -eq 'lib') } } if ( $matchingAssemblyPaths -and $matchingAssemblyPaths -is [object[]] -and $matchingAssemblyPaths.length -gt 1 ) { throw ("More than one assembly was found to match assembly '$assemblyName' -- update assembly directory to have only one of the following assemblies: {0}" -f (($matchingAssemblyPaths | foreach { "'$($_.fullname)'" }) -join ', ')) } if ($matchingAssemblyPaths) { write-verbose "Found possible assembly match for '$assemblyName' in '$($matchingAssemblyPaths[0])'" $matchingAssemblyPaths[0].fullname.replace("`\", "/") } } function LoadAssemblyFromRoot($assemblyRoot, $assemblyName, $platformSpec) { $specs = if ( $platformSpec ) { , @($platformSpec) } elseif ( __IsDesktopEdition ) { , @('net45') } else { @('netstandard1.3', 'netstandard1.1', 'netcoreapp1.0') } $assemblyPath = $null write-verbose ("Looking for assemblies with candidate platforms {0}" -f ( $specs -join ',' ) ) for ( $specIndex = 0; $specIndex -lt $specs.length; $specIndex++ ) { $spec = $specs[$specIndex] $assemblyPath = FindAssembly $assemblyRoot $assemblyName $spec if ( $assemblyPath ) { break } write-verbose "Assembly '$assemblyName' not found" } if ( ! $assemblyPath ) { throw "Unable to find assembly '$assemblyName' under root directory '$assemblyRoot'. Please re-run the installation command for this application and retry." } write-verbose "Requested assembly '$assemblyName', loading assembly '$assemblyPath'" __LoadAssembly $assemblyPath } function __LoadAssembly($assemblyPath) { [System.Reflection.Assembly]::LoadFrom($assemblyPath) } function Import-Assembly { [cmdletbinding()] param( [parameter(mandatory=$true)] [string] $AssemblyName, [string] $AssemblyRelativePath = $null, [string] $AssemblyRoot = $null, [string] $TargetFrameworkMoniker = $null ) $searchRoot = if ( $assemblyRoot ) { $assemblyRoot } else { split-path -parent (get-pscallstack)[1].scriptname } write-verbose "Using assembly root '$searchRoot'..." $assemblyFile = split-path -leaf $assemblyName if ( $assemblyFile -ne $assemblyName ) { throw "Parameter 'AssemblyName' must be a single name -- the specified value '$AssemblyName' contains path separators and is not valid." } $searchRootDirectory = if ( $AssemblyRelativePath ) { join-path $searchRoot $AssemblyRelativePath } else { $searchRoot } $searchRootItem = get-item $searchRootDirectory -erroraction ignore if ( $searchRootItem -eq $null ) { throw "Unable to find assembly '$assemblyName' because given search directory '$searchRootDirectory' was not accessible" } $searchRootFullyQualified = $searchRootItem.fullname write-verbose "Using fully qualified assembly root '$searchRootFullyQualified' to find assembly '$assemblyFile'..." LoadAssemblyFromRoot $searchRootFullyQualified $assemblyFile $TargetFrameworkMoniker } |