vikunja-api/pkg/models/list_rights.go

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// Vikunja is a to-do list application to facilitate your life.
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// Copyright 2018-2020 Vikunja and contributors. All rights reserved.
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//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
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//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
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//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
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package models
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import (
"code.vikunja.io/api/pkg/user"
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"code.vikunja.io/web"
"github.com/go-xorm/builder"
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)
// CanWrite return whether the user can write on that list or not
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func (l *List) CanWrite(a web.Auth) (bool, error) {
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// Get the list and check the right
originalList := &List{ID: l.ID}
err := originalList.GetSimpleByID()
if err != nil {
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return false, err
}
// Check if we're dealing with a share auth
shareAuth, ok := a.(*LinkSharing)
if ok {
return originalList.ID == shareAuth.ListID &&
(shareAuth.Right == RightWrite || shareAuth.Right == RightAdmin), nil
}
// Check if the user is either owner or can write to the list
if originalList.isOwner(&user.User{ID: a.GetID()}) {
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return true, nil
}
return originalList.checkRight(a, RightWrite, RightAdmin)
}
// CanRead checks if a user has read access to a list
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func (l *List) CanRead(a web.Auth) (bool, error) {
// Check if the user is either owner or can read
if err := l.GetSimpleByID(); err != nil {
return false, err
}
// Check if we're dealing with a share auth
shareAuth, ok := a.(*LinkSharing)
if ok {
return l.ID == shareAuth.ListID &&
(shareAuth.Right == RightRead || shareAuth.Right == RightWrite || shareAuth.Right == RightAdmin), nil
}
if l.isOwner(&user.User{ID: a.GetID()}) {
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return true, nil
}
return l.checkRight(a, RightRead, RightWrite, RightAdmin)
}
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// CanUpdate checks if the user can update a list
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func (l *List) CanUpdate(a web.Auth) (bool, error) {
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return l.CanWrite(a)
}
// CanDelete checks if the user can delete a list
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func (l *List) CanDelete(a web.Auth) (bool, error) {
return l.IsAdmin(a)
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}
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// CanCreate checks if the user can create a list
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func (l *List) CanCreate(a web.Auth) (bool, error) {
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// A user can create a list if he has write access to the namespace
n := &Namespace{ID: l.NamespaceID}
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return n.CanWrite(a)
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}
// IsAdmin returns whether the user has admin rights on the list or not
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func (l *List) IsAdmin(a web.Auth) (bool, error) {
originalList := &List{ID: l.ID}
err := originalList.GetSimpleByID()
if err != nil {
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return false, err
}
// Check if we're dealing with a share auth
shareAuth, ok := a.(*LinkSharing)
if ok {
return originalList.ID == shareAuth.ListID && shareAuth.Right == RightAdmin, nil
}
// Check all the things
// Check if the user is either owner or can write to the list
// Owners are always admins
if originalList.isOwner(&user.User{ID: a.GetID()}) {
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return true, nil
}
return originalList.checkRight(a, RightAdmin)
}
// Little helper function to check if a user is list owner
func (l *List) isOwner(u *user.User) bool {
return l.OwnerID == u.ID
}
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// Checks n different rights for any given user
func (l *List) checkRight(a web.Auth, rights ...Right) (bool, error) {
/*
The following loop creates an sql condition like this one:
(ul.user_id = 1 AND ul.right = 1) OR (un.user_id = 1 AND un.right = 1) OR
(tm.user_id = 1 AND tn.right = 1) OR (tm2.user_id = 1 AND tl.right = 1) OR
for each passed right. That way, we can check with a single sql query (instead if 8)
if the user has the right to see the list or not.
*/
var conds []builder.Cond
for _, r := range rights {
// User conditions
// If the list was shared directly with the user and the user has the right
conds = append(conds, builder.And(
builder.Eq{"ul.user_id": a.GetID()},
builder.Eq{"ul.right": r},
))
// If the namespace this list belongs to was shared directly with the user and the user has the right
conds = append(conds, builder.And(
builder.Eq{"un.user_id": a.GetID()},
builder.Eq{"un.right": r},
))
// Team rights
// If the list was shared directly with the team and the team has the right
conds = append(conds, builder.And(
builder.Eq{"tm2.user_id": a.GetID()},
builder.Eq{"tl.right": r},
))
// If the namespace this list belongs to was shared directly with the team and the team has the right
conds = append(conds, builder.And(
builder.Eq{"tm.user_id": a.GetID()},
builder.Eq{"tn.right": r},
))
}
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// If the user is the owner of a namespace, it has any right, all the time
conds = append(conds, builder.Eq{"n.owner_id": a.GetID()})
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exists, err := x.Select("l.*").
Table("list").
Alias("l").
// User stuff
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Join("LEFT", []string{"users_namespace", "un"}, "un.namespace_id = l.namespace_id").
Join("LEFT", []string{"users_list", "ul"}, "ul.list_id = l.id").
Join("LEFT", []string{"namespaces", "n"}, "n.id = l.namespace_id").
// Team stuff
Join("LEFT", []string{"team_namespaces", "tn"}, " l.namespace_id = tn.namespace_id").
Join("LEFT", []string{"team_members", "tm"}, "tm.team_id = tn.team_id").
Join("LEFT", []string{"team_list", "tl"}, "l.id = tl.list_id").
Join("LEFT", []string{"team_members", "tm2"}, "tm2.team_id = tl.team_id").
// The actual condition
Where(builder.And(
builder.Or(
conds...,
),
builder.Eq{"l.id": l.ID},
)).
Exist(&List{})
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return exists, err
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}