internal/Update-SqlPermissions.ps1

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function Update-SqlPermissions {
    <#
        .SYNOPSIS
            Internal function. Updates permission sets, roles, database mappings on server and databases
    #>

    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $true)]
        [ValidateNotNullOrEmpty()]
        [object]$sourceserver,
        [Parameter(Mandatory = $true)]
        [ValidateNotNullOrEmpty()]
        [object]$sourcelogin,
        [Parameter(Mandatory = $true)]
        [ValidateNotNullOrEmpty()]
        [object]$destserver,
        [Parameter(Mandatory = $true)]
        [ValidateNotNullOrEmpty()]
        [object]$destlogin,
        [switch]$Silent
    )

    $destination = $destserver.DomainInstanceName
    $source = $sourceserver.DomainInstanceName
    $username = $sourcelogin.name

    # Server Roles: sysadmin, bulklogin, etc
    foreach ($role in $sourceserver.roles) {
        $rolename = $role.name
        $destrole = $destserver.roles[$rolename]
        if ($destrole -ne $null) {
            try { $destrolemembers = $destrole.EnumMemberNames() }
            catch { $destrolemembers = $destrole.EnumServerRoleMembers() }
        }
        try { $rolemembers = $role.EnumMemberNames() }
        catch { $rolemembers = $role.EnumServerRoleMembers() }
        if ($rolemembers -contains $username) {
            if ($destrole -ne $null) {
                If ($Pscmdlet.ShouldProcess($destination, "Adding $username to $rolename server role")) {
                    try {
                        $destrole.AddMember($username)
                        Write-Message -Level Verbose -Message "Added $username to $rolename server role."
                    }
                    catch {
                        Stop-Function -Message "Failed to add $username to $rolename server role." -Target $role -ErrorRecord $_
                    }
                }
            }
        }

        # Remove for Syncs
        if ($rolemembers -notcontains $username -and $destrolemembers -contains $username -and $destrole -ne $null) {
            If ($Pscmdlet.ShouldProcess($destination, "Adding $username to $rolename server role")) {
                try {
                    $destrole.DropMember($username)
                    Write-Message -Level Verbose -Message "Removed $username from $destrolename server role on $($destserver.name)."
                }
                catch {
                    Stop-Function -Message "Failed to remove $username from $destrolename server role on $($destserver.name)." -Target $role -ErrorRecord $_
                }
            }
        }
    }

    $ownedjobs = $sourceserver.JobServer.Jobs | Where-Object { $_.OwnerLoginName -eq $username }
    foreach ($ownedjob in $ownedjobs) {
        if ($destserver.JobServer.Jobs[$ownedjob.name] -ne $null) {
            If ($Pscmdlet.ShouldProcess($destination, "Changing job owner to $username for $($ownedjob.name)")) {
                try {
                    Write-Message -Level Verbose -Message "Changing job owner to $username for $($ownedjob.name)"
                    $destownedjob = $destserver.JobServer.Jobs | Where-Object { $_.name -eq $ownedjobs.name }
                    $destownedjob.set_OwnerLoginName($username)
                    $destownedjob.Alter()
                }
                catch {
                    Stop-Function -Message "Could not change job owner for $($ownedjob.name)" -Target $ownedJob -ErrorRecord $_
                }
            }
        }
    }

    if ($sourceserver.versionMajor -ge 9 -and $destserver.versionMajor -ge 9) {
        # These operations are only supported by SQL Server 2005 and above.
        # Securables: Connect SQL, View any database, Administer Bulk Operations, etc.

        $perms = $sourceserver.EnumServerPermissions($username)
        foreach ($perm in $perms) {
            $permstate = $perm.permissionstate
            if ($permstate -eq "GrantWithGrant") { $grantwithgrant = $true; $permstate = "grant" }
            else { $grantwithgrant = $false }
            $permset = New-Object Microsoft.SqlServer.Management.Smo.ServerPermissionSet($perm.permissiontype)
            If ($Pscmdlet.ShouldProcess($destination, "Performing $permstate on $($perm.permissiontype) for $username")) {
                try {
                    $destserver.PSObject.Methods[$permstate].Invoke($permset, $username, $grantwithgrant)
                    Write-Message -Level Verbose -Message "Successfully performed $permstate $($perm.permissiontype) to $username"
                }
                catch {
                    Stop-Function -Message "Failed to $permstate $($perm.permissiontype) to $username" -Target $perm -ErrorRecord $_
                }
            }

            # for Syncs
            $destperms = $destserver.EnumServerPermissions($username)
            foreach ($perm in $destperms) {
                $permstate = $perm.permissionstate
                $sourceperm = $perms | Where-Object { $_.PermissionType -eq $perm.Permissiontype -and $_.PermissionState -eq $permstate }
                if ($sourceperm -eq $null) {
                    If ($Pscmdlet.ShouldProcess($destination, "Performing Revoke on $($perm.permissiontype) for $username")) {
                        try {
                            $permset = New-Object Microsoft.SqlServer.Management.Smo.ServerPermissionSet($perm.permissiontype)
                            if ($permstate -eq "GrantWithGrant") { $grantwithgrant = $true; $permstate = "grant" }
                            else { $grantwithgrant = $false }
                            $destserver.PSObject.Methods["Revoke"].Invoke($permset, $username, $false, $grantwithgrant)
                            Write-Message -Level Verbose -Message "Successfully revoked $($perm.permissiontype) from $username"
                        }
                        catch {
                            Stop-Function -Message "Failed to revoke $($perm.permissiontype) from $username" -Target $perm -ErrorRecord $_
                        }
                    }
                }
            }
        }

        # Credential mapping. Credential removal not currently supported for Syncs.
        $logincredentials = $sourceserver.credentials | Where-Object { $_.Identity -eq $sourcelogin.name }
        foreach ($credential in $logincredentials) {
            if ($destserver.Credentials[$credential.name] -eq $null) {
                If ($Pscmdlet.ShouldProcess($destination, "Adding $($credential.name) to $username")) {
                    try {
                        $newcred = New-Object Microsoft.SqlServer.Management.Smo.Credential($destserver, $credential.name)
                        $newcred.identity = $sourcelogin.name
                        $newcred.Create()
                        Write-Message -Level Verbose -Message "Successfully created credential for $username"
                    }
                    catch {
                        Stop-Function -Message "Failed to create credential for $username" -Target $credential -ErrorRecord $_
                    }
                }
            }
        }
    }

    if ($destserver.versionMajor -lt 9) {
        Write-Message -Level Warning -Message "Database mappings skipped when destination is SQL Server 2000"; continue
    }

    # For Sync, if info doesn't exist in EnumDatabaseMappings, then no big deal.
    foreach ($db in $destlogin.EnumDatabaseMappings()) {
        $dbname = $db.dbname
        $destdb = $destserver.databases[$dbname]
        $sourcedb = $sourceserver.databases[$dbname]
        $dbusername = $db.username; $dblogin = $db.loginName

        if ($sourcedb -ne $null) {
            if ($sourcedb.users[$dbusername] -eq $null -and $destdb.users[$dbusername] -ne $null) {
                If ($Pscmdlet.ShouldProcess($destination, "Dropping $dbusername from $dbname on destination.")) {
                    try {
                        $destdb.users[$dbusername].Drop()
                        Write-Message -Level Verbose -Message "Dropped user $dbusername (login: $dblogin) from $dbname on destination. User may own a schema."
                    }
                    catch {
                        Stop-Function -Message "Failed to drop $dbusername ($dblogin) from $dbname on destination." -Target $db -ErrorRecord $_
                    }
                }
            }

            # Remove user from role. Role removal not currently supported for Syncs.
            # TODO: reassign if dbo, application roles
            foreach ($destrole in $destdb.roles) {
                $destrolename = $destrole.name
                $sourcerole = $sourcedb.roles[$destrolename]
                if ($sourcerole -ne $null) {
                    if ($sourcerole.EnumMembers() -notcontains $dbusername -and $destrole.EnumMembers() -contains $dbusername) {
                        if ($dbusername -ne "dbo") {
                            If ($Pscmdlet.ShouldProcess($destination, "Dropping $username from $destrolename database role on $dbname")) {
                                try {
                                    $destrole.DropMember($dbusername)
                                    $destdb.Alter()
                                    Write-Message -Level Verbose -Message "Dropped username $dbusername (login: $dblogin) from $destrolename on $destination"
                                }
                                catch {
                                    Stop-Function -Message "Failed to remove $dbusername from $destrolename database role on $dbname." -Target $destrole -ErrorRecord $_
                                }
                            }
                        }
                    }
                }
            }

            # Remove Connect, Alter Any Assembly, etc
            $destperms = $destdb.EnumDatabasePermissions($username)
            $perms = $sourcedb.EnumDatabasePermissions($username)
            # for Syncs
            foreach ($perm in $destperms) {
                $permstate = $perm.permissionstate
                $sourceperm = $perms | Where-Object { $_.PermissionType -eq $perm.Permissiontype -and $_.PermissionState -eq $permstate }
                if ($sourceperm -eq $null) {
                    If ($Pscmdlet.ShouldProcess($destination, "Performing Revoke on $($perm.permissiontype) for $username on $dbname on $destination")) {
                        try {
                            $permset = New-Object Microsoft.SqlServer.Management.Smo.DatabasePermissionSet($perm.permissiontype)
                            if ($permstate -eq "GrantWithGrant") { $grantwithgrant = $true; $permstate = "grant" }
                            else { $grantwithgrant = $false }
                            $destdb.PSObject.Methods["Revoke"].Invoke($permset, $username, $false, $grantwithgrant)
                            Write-Message -Level Verbose -Message "Successfully revoked $($perm.permissiontype) from $username on $dbname on $destination"
                        }
                        catch {
                            Stop-Function -Message "Failed to revoke $($perm.permissiontype) from $username on $dbname on $destination" -Target $perm -ErrorRecord $_
                        }
                    }
                }
            }
        }
    }

    # Adding database mappings and securables
    foreach ($db in $sourcelogin.EnumDatabaseMappings()) {
        $dbname = $db.dbname
        $destdb = $destserver.databases[$dbname]
        $sourcedb = $sourceserver.databases[$dbname]
        $dbusername = $db.username; $dblogin = $db.loginName

        if ($destdb -ne $null) {
            if (!$destdb.IsAccessible) {
                Write-Message -Level Verbose -Message "Database [$($destdb.Name)] is not accessible. Skipping"
                Continue
            }
            if ($destdb.users[$dbusername] -eq $null) {
                If ($Pscmdlet.ShouldProcess($destination, "Adding $dbusername to $dbname")) {
                    $sql = $sourceserver.databases[$dbname].users[$dbusername].script() | Out-String
                    $sql = $sql -replace [Regex]::Escape("'$source'"), "'$destination'"
                    try {
                        $destdb.ExecuteNonQuery($sql)
                        Write-Message -Level Verbose -Message "Added user $dbusername (login: $dblogin) to $dbname"
                    }
                    catch {
                        Stop-Function -Message "Failed to add $dbusername ($dblogin) to $dbname on $destination." -Target $db -ErrorRecord $_
                    }
                }
            }

            # Db owner
            If ($sourcedb.owner -eq $username) {
                If ($Pscmdlet.ShouldProcess($destination, "Changing $dbname dbowner to $username")) {
                    try {
                        $result = Update-SqlDbOwner $sourceserver $destserver -dbname $dbname
                        if ($result -eq $true) {
                            Write-Message -Level Verbose -Message "Changed $($destdb.name) owner to $($sourcedb.owner)."
                        }
                        else {
                            Write-Message -Level Warning -Message "Failed to update $($destdb.name) owner to $($sourcedb.owner)."
                        }
                    }
                    catch {
                        Write-Message -Level Warning -Message "Failed to update $($destdb.name) owner to $($sourcedb.owner)."
                    }
                }
            }

            # Database Roles: db_owner, db_datareader, etc
            foreach ($role in $sourcedb.roles) {
                if ($role.EnumMembers() -contains $username) {
                    $rolename = $role.name
                    $destdbrole = $destdb.roles[$rolename]

                    if ($destdbrole -ne $null -and $dbusername -ne "dbo" -and $destdbrole.EnumMembers() -notcontains $username) {
                        If ($Pscmdlet.ShouldProcess($destination, "Adding $username to $rolename database role on $dbname")) {
                            try {
                                $destdbrole.AddMember($username)
                                $destdb.Alter()
                                Write-Message -Level Verbose -Message "Added $username to $rolename database role on $dbname."

                            }
                            catch {
                                Stop-Function -Message "Failed to add $username to $rolename database role on $dbname." -Target $role -InnerErroRecord $_
                            }
                        }
                    }
                }
            }

            # Connect, Alter Any Assembly, etc
            $perms = $sourcedb.EnumDatabasePermissions($username)
            foreach ($perm in $perms) {
                $permstate = $perm.permissionstate
                if ($permstate -eq "GrantWithGrant") { $grantwithgrant = $true; $permstate = "grant" }
                else { $grantwithgrant = $false }
                $permset = New-Object Microsoft.SqlServer.Management.Smo.DatabasePermissionSet($perm.permissiontype)
                If ($Pscmdlet.ShouldProcess($destination, "Performing $permstate on $($perm.permissiontype) for $username on $dbname")) {
                    try {
                        $destdb.PSObject.Methods[$permstate].Invoke($permset, $username, $grantwithgrant)
                        Write-Message -Level Verbose -Message "Successfully performed $permstate $($perm.permissiontype) to $username on $dbname"
                    }
                    catch {
                        Stop-Function -Message "Failed to perform $permstate on $($perm.permissiontype) for $username on $dbname." -Target $perm -ErrorRecord $_
                    }
                }
            }
        }
    }
}