Get-SqlDscLogin: command to retrieve SQL Server logins

CHANGELOG.md

@@ -15,6 +15,13 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
     exists as a login, throwing a terminating error if it doesn't exist.
   - Supports pipeline input and provides detailed error messages with localization.
   - Uses `Test-SqlDscIsLogin` command for login validation following module patterns.
+- `Get-SqlDscLogin`
+  - Added new public command to get a SQL Server login from a Database Engine instance.
+  - Returns a `Microsoft.SqlServer.Management.Smo.Login` object that represents
+    the login.
+  - Supports getting a specific login by name or all logins if no name is specified.
+  - Includes a `-Refresh` parameter to refresh the server's login collection
+    before retrieval.
 
 ### Changed
 

azure-pipelines.yml

@@ -249,6 +249,7 @@ stages:
                   'tests/Integration/Commands/Connect-SqlDscDatabaseEngine.Integration.Tests.ps1'
                   # Group 2
                   'tests/Integration/Commands/Assert-SqlDscLogin.Integration.Tests.ps1'
+                  'tests/Integration/Commands/Get-SqlDscLogin.Integration.Tests.ps1'
                   # Group 9
                   'tests/Integration/Commands/Uninstall-SqlDscServer.Integration.Tests.ps1'
               )

source/Public/Get-SqlDscLogin.ps1

@@ -0,0 +1,94 @@
+<#
+    .SYNOPSIS
+        Get server login.
+
+    .DESCRIPTION
+        This command gets a server login from a SQL Server Database Engine instance.
+
+    .PARAMETER ServerObject
+        Specifies current server connection object.
+
+    .PARAMETER Name
+        Specifies the name of the server login to get.
+
+    .PARAMETER Refresh
+        Specifies that the **ServerObject**'s logins should be refreshed before
+        trying get the login object. This is helpful when logins could have been
+        modified outside of the **ServerObject**, for example through T-SQL. But
+        on instances with a large amount of logins it might be better to make
+        sure the **ServerObject** is recent enough.
+
+    .EXAMPLE
+        $serverObject = Connect-SqlDscDatabaseEngine -InstanceName 'MyInstance'
+        $serverObject | Get-SqlDscLogin -Name 'MyLogin'
+
+        Get the login named **MyLogin**.
+
+    .OUTPUTS
+        `[Microsoft.SqlServer.Management.Smo.Login]`
+
+        Returns a single Login object when the Name parameter is specified and a
+        match is found.
+
+    .OUTPUTS
+        `[Microsoft.SqlServer.Management.Smo.Login[]]`
+
+        Returns an array of Login objects when the Name parameter is not specified
+        (returns all logins) or when multiple matches are found.
+#>
+function Get-SqlDscLogin
+{
+    [System.Diagnostics.CodeAnalysis.SuppressMessageAttribute('UseSyntacticallyCorrectExamples', '', Justification = 'Because the rule does not yet support parsing the code when a parameter type is not available. The ScriptAnalyzer rule UseSyntacticallyCorrectExamples will always error in the editor due to https://github.com/indented-automation/Indented.ScriptAnalyzerRules/issues/8.')]
+    [OutputType([Microsoft.SqlServer.Management.Smo.Login[]])]
+    [CmdletBinding()]
+    param
+    (
+        [Parameter(Mandatory = $true, ValueFromPipeline = $true)]
+        [Microsoft.SqlServer.Management.Smo.Server]
+        $ServerObject,
+
+        [Parameter()]
+        [System.String]
+        $Name,
+
+        [Parameter()]
+        [System.Management.Automation.SwitchParameter]
+        $Refresh
+    )
+
+    process
+    {
+        if ($Refresh.IsPresent)
+        {
+            # Make sure the logins are up-to-date to get any newly created logins.
+            $ServerObject.Logins.Refresh()
+        }
+
+        $loginObject = @()
+
+        if ($PSBoundParameters.ContainsKey('Name'))
+        {
+            $loginObject = $ServerObject.Logins[$Name]
+
+            if (-not $loginObject)
+            {
+                $missingLoginMessage = $script:localizedData.Login_Get_Missing -f $Name
+
+                $writeErrorParameters = @{
+                    Message      = $missingLoginMessage
+                    Category     = 'ObjectNotFound'
+                    ErrorId      = 'GSDL0001' # cspell: disable-line
+                    TargetObject = $Name
+                }
+
+                Write-Error @writeErrorParameters
+            }
+        }
+        else
+        {
+            $loginObject = $ServerObject.Logins
+        }
+
+        return [Microsoft.SqlServer.Management.Smo.Login[]] $loginObject
+    }
+}

source/en-US/SqlServerDsc.strings.psd1

@@ -61,6 +61,9 @@ ConvertFrom-StringData @'
     ## Get-SqlDscAudit
     Audit_Missing = There is no audit with the name '{0}'.
 
+    ## Get-SqlDscLogin
+    Login_Get_Missing = There is no login with the name '{0}'.
+
     ## Remove-SqlDscAudit
     Audit_Remove_ShouldProcessVerboseDescription = Removing the audit '{0}' on the instance '{1}'.
     Audit_Remove_ShouldProcessVerboseWarning = Are you sure you want to remove the audit '{0}'?

tests/Integration/Commands/Get-SqlDscLogin.Integration.Tests.ps1

@@ -0,0 +1,111 @@
+[System.Diagnostics.CodeAnalysis.SuppressMessageAttribute('PSUseDeclaredVarsMoreThanAssignments', '', Justification = 'Suppressing this rule because Script Analyzer does not understand Pester syntax.')]
+param ()
+
+BeforeDiscovery {
+    try
+    {
+        if (-not (Get-Module -Name 'DscResource.Test'))
+        {
+            # Assumes dependencies have been resolved, so if this module is not available, run 'noop' task.
+            if (-not (Get-Module -Name 'DscResource.Test' -ListAvailable))
+            {
+                # Redirect all streams to $null, except the error stream (stream 2)
+                & "$PSScriptRoot/../../../build.ps1" -Tasks 'noop' 3>&1 4>&1 5>&1 6>&1 > $null
+            }
+
+            # If the dependencies have not been resolved, this will throw an error.
+            Import-Module -Name 'DscResource.Test' -Force -ErrorAction 'Stop'
+        }
+    }
+    catch [System.IO.FileNotFoundException]
+    {
+        throw 'DscResource.Test module dependency not found. Please run ".\build.ps1 -ResolveDependency -Tasks build" first.'
+    }
+}
+
+BeforeAll {
+    $script:dscModuleName = 'SqlServerDsc'
+
+    Import-Module -Name $script:dscModuleName
+}
+
+Describe 'Get-SqlDscLogin' -Tag @('Integration_SQL2016', 'Integration_SQL2017', 'Integration_SQL2019', 'Integration_SQL2022') {
+    BeforeAll {
+        # Starting the named instance SQL Server service prior to running tests.
+        Start-Service -Name 'MSSQL$DSCSQLTEST' -Verbose -ErrorAction 'Stop'
+
+        $script:mockInstanceName = 'DSCSQLTEST'
+        $script:mockComputerName = Get-ComputerName
+
+        $mockSqlAdministratorUserName = 'SqlAdmin' # Using computer name as NetBIOS name throw exception.
+        $mockSqlAdministratorPassword = ConvertTo-SecureString -String 'P@ssw0rd1' -AsPlainText -Force
+
+        $script:mockSqlAdminCredential = [System.Management.Automation.PSCredential]::new($mockSqlAdministratorUserName, $mockSqlAdministratorPassword)
+
+        $script:serverObject = Connect-SqlDscDatabaseEngine -InstanceName $script:mockInstanceName -Credential $script:mockSqlAdminCredential
+    }
+
+    AfterAll {
+        # Stop the named instance SQL Server service to save memory on the build worker.
+        Stop-Service -Name 'MSSQL$DSCSQLTEST' -Verbose -ErrorAction 'Stop'
+    }
+
+
+    Context 'When getting all SQL Server logins' {
+        It 'Should return an array of Login objects' {
+            $result = Get-SqlDscLogin -ServerObject $script:serverObject
+
+            <#
+                Casting to array to ensure we get the count on Windows PowerShell
+                when there is only one login.
+            #>
+            @($result).Count | Should -BeGreaterOrEqual 1
+            @($result)[0] | Should -BeOfType 'Microsoft.SqlServer.Management.Smo.Login'
+        }
+
+        It 'Should return system logins including sa' {
+            $result = Get-SqlDscLogin -ServerObject $script:serverObject
+
+            $result.Name | Should -Contain 'sa'
+        }
+    }
+
+    Context 'When getting a specific SQL Server login' {
+        It 'Should return the specified login when it exists' {
+            $result = Get-SqlDscLogin -ServerObject $script:serverObject -Name 'sa'
+
+            $result | Should -BeOfType 'Microsoft.SqlServer.Management.Smo.Login'
+            $result.Name | Should -Be 'sa'
+            $result.LoginType | Should -Be 'SqlLogin'
+        }
+
+        It 'Should throw an error when the login does not exist' {
+            { Get-SqlDscLogin -ServerObject $script:serverObject -Name 'NonExistentLogin' -ErrorAction 'Stop' } |
+                Should -Throw -ExpectedMessage 'There is no login with the name ''NonExistentLogin''.'
+        }
+
+        It 'Should return null when the login does not exist and error action is SilentlyContinue' {
+            $result = Get-SqlDscLogin -ServerObject $script:serverObject -Name 'NonExistentLogin' -ErrorAction 'SilentlyContinue'
+
+            $result | Should -BeNullOrEmpty
+        }
+    }
+
+    Context 'When using the Refresh parameter' {
+        It 'Should return the same results with and without Refresh' {
+            $resultWithoutRefresh = Get-SqlDscLogin -ServerObject $script:serverObject
+            $resultWithRefresh = Get-SqlDscLogin -ServerObject $script:serverObject -Refresh
+
+            @($resultWithoutRefresh).Count | Should -Be @($resultWithRefresh).Count
+        }
+    }
+
+    Context 'When using pipeline input' {
+        It 'Should accept ServerObject from pipeline' {
+            $result = $script:serverObject | Get-SqlDscLogin -Name 'sa'
+
+            $result | Should -BeOfType 'Microsoft.SqlServer.Management.Smo.Login'
+            $result.Name | Should -Be 'sa'
+        }
+    }
+}