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@using System.Numerics;
@inject HBContext db
@implements IDialog
<Dialog HeightPixels=500 WidthPixels=900 Title="Edit permissions" @ref=dialog>
<div class="vcontainer">
<div class="hcontainer">
<div>
@if(obj?.Acl is not null) {
<MiniPrincipalSelect Label="Owner"/>
<table class="data-table">
<tr>
<th>Action</th>
<th>Subject</th>
<th colspan="2">Permissions</th>
</tr>
@foreach(var rule in obj.Acl.Rules.OrderByDescending(r => r.Action)) {
<tr>
<td>
<div>
<AclActionSwitch
InitialValue=@(rule.Action == AclRuleAction.Allow)
OnToggle=@((v) => rule.Action = v ? AclRuleAction.Allow : AclRuleAction.Deny)/>
</div>
</td>
<td>
@rule.Principal.ToString()
</td>
<td>@GetActivePermissions(rule)</td>
<td>
<a title="Edit" href="javascript:;" @onclick=@(() => EditRule(rule))>🖉</a>
<a title="Delete" href="javascript:;" @onclick=@(() => RemoveRule(rule))>✖</a>
</td>
</tr>
}
</table>
<br/>
<center><a href="javascript:;" @onclick=AddRule>Add new</a></center>
}
</div>
<div>
@if(ruleToEdit is not null && permissionCheckboxes is not null) {
<MiniPrincipalSelect Label="Subject"/>
var permissions = Acl.GetPermissionDescriptions(obj)
.OrderByDescending(kv => BitOperations.PopCount(kv.Value))
.ThenBy(kv => kv.Value);
foreach(var perm in permissionCheckboxes) {
<label>
<input
type="checkbox"
@bind=perm.Value/>
@perm.Description
</label>
}
} else {
<p><i>Click 'Edit' next to a rule to edit it's permissions</i></p>
}
</div>
</div>
<ButtonContainer>
<button class="secondary" @onclick=Hide>Cancel</button>
@if(obj?.Acl is not null) {
<button data-keyboard-shortcut="a" @onclick=ApplyAcl disabled=@(ApplyDisabled)>
<u>A</u>pply
</button>
}
</ButtonContainer>
</div>
</Dialog>
@code {
public bool Visible {
get => dialog.Visible;
set {
if(value && obj is null)
throw new ArgumentException("Object must not be null!", "Object");
dialog.Visible = value;
if(value)
StateHasChanged();
}
}
private HBObject obj;
private AclRule? ruleToEdit;
private PermissionCheckbox[]? permissionCheckboxes;
private int lastHashCode;
private bool addedAcl;
private string? editOwner;
private string? editSubject;
private Dialog dialog;
public void Show() => Visible = true;
public void Hide() => Visible = false;
public void Show(HBObject obj) {
Object = obj;
Show();
}
public HBObject Object {
get => obj;
set {
editOwner = null;
CancelEditRule();
obj = db.Objects
.Include(o => o.Acl)
.First(o => o.ObjectId == value.ObjectId);
if (obj.Acl is not null) {
db.Entry(obj.Acl).Collection(a => a.Rules).Load();
addedAcl = false;
} else {
obj.Acl = new() {
Rules = new()
};
addedAcl = true;
}
lastHashCode = GetAclHashCode(obj.Acl);
}
}
public bool ApplyDisabled =>
#if DEBUG
false;
#else
GetAclHashCode(obj.Acl!) == lastHashCode ||
obj.Acl!.Rules.Select(r => r.Principal).Contains(WellKnownSid.NullSid);
#endif
private string GetActivePermissions(AclRule rule) {
var perms = Acl.GetPermissionDescriptions(obj)
.Where(kv => (rule.Permissions & kv.Value) == kv.Value)
.ToList();
// Filter the list of matching permissions to include the
// most relevant encapsulation permissions only. E.g. if
// 'Full access' includes 'Read' and 'Write', then only
// show 'Full access'.
List<int> toRemove = new();
for(int i = 0; i < perms.Count(); i++)
for(int j = 0; j < perms.Count(); j++)
if(i != j)
if((perms[i].Value & perms[j].Value) == perms[i].Value)
toRemove.Add(i);
toRemove = toRemove.Order().Distinct().ToList();
for(int i = toRemove.Count() - 1; i >= 0; i--)
perms.RemoveAt(toRemove[i]);
return string.Join(", ", perms
.OrderByDescending(kv => BitOperations.PopCount(kv.Value))
.ThenBy(kv => kv.Value)
.Select(kv => kv.Key));
}
private void ApplyAcl() {
db.SaveChanges();
Hide();
}
private void AddRule() {
var rule = new AclRule() {
Principal = WellKnownSid.NullSid,
Action = AclRuleAction.Allow,
Permissions = 0
};
obj.Acl!.Rules.Add(rule);
EditRule(rule);
}
private void RemoveRule(AclRule rule) {
if(rule == ruleToEdit)
CancelEditRule();
obj.Acl!.Rules.Remove(rule);
}
private void EditRule(AclRule rule) {
ruleToEdit = rule;
editSubject = null;
permissionCheckboxes = Acl.GetPermissionDescriptions(obj)
.OrderByDescending(kv => BitOperations.PopCount(kv.Value))
.ThenBy(kv => kv.Value)
.Select(kv => new PermissionCheckbox(rule, kv))
.ToArray();
}
private void CancelEditRule() {
ruleToEdit = null;
permissionCheckboxes = null;
}
// Special hash function to identify only the elements of
// the ACL that may have been changed by the user via this
// dialog.
private int GetAclHashCode(Acl acl) =>
!acl.Rules.Any() ? 0 : acl.Rules
.Select(r => (
r.Action,
r.Permissions,
r.Principal.GetHashCode()).GetHashCode())
.Aggregate((a, v) => HashCode.Combine(a, v));
private class PermissionCheckbox {
public string Description { get; private init; }
private AclRule rule;
private ulong mask;
public PermissionCheckbox(AclRule rule, KeyValuePair<string, ulong> kv) {
this.rule = rule;
this.mask = kv.Value;
Description = kv.Key;
}
public bool Value {
get => (rule.Permissions & mask) == mask;
set {
if(value)
rule.Permissions |= mask;
else
rule.Permissions &= ~mask;
}
}
}
}
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