{sharepoint} SetPermission

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.SharePoint;

namespace CR.SharePoint.HR.Common
{
public static class PermissionManager
{

//SPGroup group = web.Groups[0];
//SPUser user = web.Users[0];
//SPUser user2 = web.EnsureUser("mangaldas.mano");
//SPUser user3 = web.EnsureUser("Domain Users");
//SPPrincipal[] principals = { group, user, user2, user3 };

#region Adding Permissions to an item

/// <summary>
/// Set Permissions
/// </summary>
/// <param name="item">SPListItem</param>
/// <param name="principals">IEnumerable</param>
/// <param name="roleType">SPRoleType</param>
public static void SetPermissions(SPListItem item, IEnumerable<SPPrincipal> principals, SPRoleType roleType)
{
if (item != null)
{
foreach (SPPrincipal principal in principals)
{
SPRoleDefinition roleDefinition = item.Web.RoleDefinitions.GetByType(roleType);
SetPermissions(item, principal, roleDefinition);
}
}
}

/// <summary>
/// Set Permissions
/// </summary>
/// <param name="item">SPListItem</param>
/// <param name="user">SPUser</param>
/// <param name="roleType">SPRoleType</param>
public static void SetPermissions(SPListItem item, SPUser user, SPRoleType roleType)
{
if (item != null)
{
SPRoleDefinition roleDefinition = item.Web.RoleDefinitions.GetByType(roleType);
SetPermissions(item, (SPPrincipal)user, roleDefinition);
}
}

/// <summary>
/// Set Permissions
/// </summary>
/// <param name="item">SPListItem</param>
/// <param name="principal">SPPrincipal</param>
/// <param name="roleType">SPRoleType</param>
public static void SetPermissions(SPListItem item, SPPrincipal principal, SPRoleType roleType)
{
if (item != null)
{
SPRoleDefinition roleDefinition = item.Web.RoleDefinitions.GetByType(roleType);
SetPermissions(item, principal, roleDefinition);
}
}

/// <summary>
/// Set Permissions
/// </summary>
/// <param name="item">SPListItem</param>
/// <param name="user">SPUser</param>
/// <param name="roleDefinition">SPRoleDefinition</param>
public static void SetPermissions(SPListItem item, SPUser user, SPRoleDefinition roleDefinition)
{
if (item != null)
{
SetPermissions(item, (SPPrincipal)user, roleDefinition);
}
}

/// <summary>
/// Set Permissions
/// </summary>
/// <param name="item">SPListItem</param>
/// <param name="principal">SPPrincipal</param>
/// <param name="roleDefinition">SPRoleDefinition</param>
public static void SetPermissions(SPListItem item, SPPrincipal principal, SPRoleDefinition roleDefinition)
{
if (item != null)
{
SPRoleAssignment roleAssignment = new SPRoleAssignment(principal);
roleAssignment.RoleDefinitionBindings.Add(roleDefinition);
item.RoleAssignments.Add(roleAssignment);
}
}

#endregion

#region Deleting all user Permissions from an item

/// <summary>
/// remove permisions
/// </summary>
/// <param name="item">SPListItem</param>
/// <param name="user">SPUser</param>
public static void RemovePermissions(SPListItem item, SPUser user)
{
if (item != null)
{
RemovePermissions(item, user as SPPrincipal);
}
}

/// <summary>
/// remove permisions
/// </summary>
/// <param name="item">SPListItem</param>
/// <param name="principal">SPPrincipal</param>
public static void RemovePermissions(SPListItem item, SPPrincipal principal)
{
if (item != null)
{
item.RoleAssignments.Remove(principal);
item.SystemUpdate();
}
}

#endregion

#region Removing specific roles from an item

/// <summary>
/// remove permission
/// </summary>
/// <param name="item">SPListItem</param>
/// <param name="principal">SPPrincipal</param>
/// <param name="roleDefinition">SPRoleDefinition</param>
public static void RemovePermissionsSpecificRole(SPListItem item, SPPrincipal principal, SPRoleDefinition roleDefinition)
{
if (item != null)
{
SPRoleAssignment roleAssignment = item.RoleAssignments.GetAssignmentByPrincipal(principal);
if (roleAssignment != null)
{
if (roleAssignment.RoleDefinitionBindings.Contains(roleDefinition))
{
roleAssignment.RoleDefinitionBindings.Remove(roleDefinition);
roleAssignment.Update();
}
}
}
}

/// <summary>
/// remove permission
/// </summary>
/// <param name="item">SPListItem</param>
/// <param name="principal">SPPrincipal</param>
/// <param name="roleType">SPRoleType</param>
public static void RemovePermissionsSpecificRole(SPListItem item, SPPrincipal principal, SPRoleType roleType)
{
if (item != null)
{
SPRoleDefinition roleDefinition = item.Web.RoleDefinitions.GetByType(roleType);
RemovePermissionsSpecificRole(item, principal, roleDefinition);
}
}

#endregion

#region Updating or Modifying Permissions on an item

/// <summary>
/// modify Permissions
/// </summary>
/// <param name="item">SPListItem</param>
/// <param name="principal">SPPrincipal</param>
/// <param name="roleType">SPRoleType</param>
public static void ChangePermissions(SPListItem item, SPPrincipal principal, SPRoleType roleType)
{
if (item != null)
{
SPRoleDefinition roleDefinition = item.Web.RoleDefinitions.GetByType(roleType);
ChangePermissions(item, principal, roleDefinition);
}
}

/// <summary>
/// modify Permissions
/// </summary>
/// <param name="item">SPListItem</param>
/// <param name="principal">SPPrincipal</param>
/// <param name="roleDefinition">SPRoleDefinition</param>
public static void ChangePermissions(SPListItem item, SPPrincipal principal, SPRoleDefinition roleDefinition)
{
SPRoleAssignment roleAssignment = item.RoleAssignments.GetAssignmentByPrincipal(principal);

if (roleAssignment != null)
{
roleAssignment.RoleDefinitionBindings.RemoveAll();
roleAssignment.RoleDefinitionBindings.Add(roleDefinition); roleAssignment.Update();
}
}

#endregion

}
}