Fix vcpkg PR notification logic

Author: danieljurek

eng/pipelines/templates/stages/archetype-cpp-release.yml

@@ -193,15 +193,20 @@ stages:
                           OpenAsDraft: ${{ parameters.TestPipeline }}
                           CloseAfterOpenForTesting: '${{ parameters.TestPipeline }}'
 
+                      # Workaround: -Fallback uses names from CODEOWNERS who
+                      # should be notified about the release in the event of a
+                      # failure to resolve the appropriate aliases.
                       - pwsh: |
-                          $codeOwnersToNotify = $(Build.SourcesDirectory)/eng/common/scripts/get-codeowners.ps1 `
-                            -TargetDirectory "/sdk/${{ parameters.ServiceDirectory }}/" `
-                            -CodeownersFileLocation "$(Build.SourcesDirectory)/.github/CODEOWNERS"
+                          $notifyUsers = ./eng/scripts/Get-TriggeringUserGitHubAlias.ps1 `
+                            -EmailAddress '$(Build.RequestedForEmail)' `
+                            -ClientId '$(opensource-aad-app-id)' `
+                            -ClientSecret '$(opensource-aad-secret)' `
+                            -TenantId '$(opensource-aad-tenant-id)' `
+                            -Fallback '@rickwinter @ahsonkhan @antkmsft @vhvb1989 @gearama @LarryOsterman'
 
                           $prComment = "Adding ${{ artifact.Name }} to release"
-                          if ($codeOwnersToNotify) {
-                            $codeOwners = $codeOwnersToNotify.ForEach({ "@$_" }) -join ", "
-                            $prComment += "`n`ncc: $codeOwners"
+                          if ($notifyUsers) {
+                            $prComment += "`n`ncc: $notifyUsers"
                           }
 
                           ./eng/common/scripts/Add-IssueComment.ps1 `

eng/scripts/Get-TriggeringUserGitHubAlias.ps1

@@ -0,0 +1,28 @@
+param(
+    [string] $EmailAddress = $env:BUILD_REQUESTEDFOREMAIL,
+    [string] $ClientId,
+    [string] $ClientSecret,
+    [string] $TenantId,
+    [string] $Fallback
+)
+
+. "$PSScriptRoot/../common/scripts/Helpers/Metadata-Helpers.ps1"
+
+$allUsers = GetAllGitHubUsers `
+    -TenantId $TenantId `
+    -ClientId $ClientId `
+    -ClientSecret $ClientSecret
+
+if (!$allUsers) {
+    Write-Host "Failed to get all GitHub users"
+    return $Fallback
+}
+
+$targetUser = $allUsers.Where({ $_.aad.userPrincipalName -eq $EmailAddress -and $_.github.login }, 'First')
+
+if (!$targetUser) {
+    Write-Host "Failed to find GitHub user for $EmailAddress"
+    return $Fallback
+}
+
+return "@$($targetUser.github.login)"