-
Notifications
You must be signed in to change notification settings - Fork 0
/
permission.go
205 lines (196 loc) · 5.61 KB
/
permission.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
package database
// Used during <Init> of the database, only called once
// Creates the table containing <permissions> if it doesn't exists already
// Can return an error if the database fails
func createHasPermissionTable() error {
_, err := db.Exec(`
CREATE TABLE
IF NOT EXISTS
hasPermission(
Username VARCHAR(20),
Permission VARCHAR(30),
CONSTRAINT HasPermissionUsername
FOREIGN KEY (Username)
REFERENCES user(Username),
CONSTRAINT HasPermissionPermission
FOREIGN KEY (Permission)
REFERENCES permission(Permission)
)
`)
if err != nil {
log.Error("Could not create hasPermission table: Executing query failed: ", err.Error())
return err
}
return nil
}
// Used during <init> of the database, only called once
// May return an error if the database fails
func createPermissionTable() error {
_, err := db.Exec(`
CREATE TABLE
IF NOT EXISTS
permission(
Permission VARCHAR(30) PRIMARY KEY,
Name VARCHAR(100),
Description TEXT
)
`)
if err != nil {
log.Error("Could not create permissions table: Executing query failed: ", err.Error())
return err
}
return nil
}
// Creates permissions defined in `schemas.go` and inserts them into the permissions table
func initializePermissions() error {
query, err := db.Prepare(`
INSERT INTO
permission(
Permission,
Name,
Description)
VALUES(?, ?, ?)
ON DUPLICATE KEY UPDATE
Name=VALUES(Name)
`)
if err != nil {
log.Error("Failed to create permission: preparing query failed: ", err.Error())
return err
}
defer query.Close()
for _, permission := range Permissions {
res, err := query.Exec(permission.Permission, permission.Name, permission.Description)
if err != nil {
log.Error("Failed to create permission: executing query failed: ", err.Error())
return err
}
rowsAffected, err := res.RowsAffected()
if err != nil {
log.Error("Failed to obtain rows affected: ", err.Error())
return err
}
if rowsAffected > 0 {
log.Debug("Inserted new permission into permissions table: ", permission.Permission)
}
}
return nil
}
// Adds a permission to a user, if database fails, then an error is returned
// Does not check for username or presence of the permission,
// => additional checks should be completed beforehand
func AddUserPermission(username string, permission PermissionType) error {
query, err := db.Prepare(`
INSERT INTO
hasPermission(
Username,
Permission
)
VALUES(?,?)
`)
if err != nil {
log.Error("Could not add permission: preparing query failed: ", err.Error())
return err
}
defer query.Close()
_, err = query.Exec(username, permission)
if err != nil {
log.Error("Could not add permission: executing query failed: ", err.Error())
return err
}
return nil
}
// Attempts to remove a provided permission from a provided user
// Fails if permission does not exist or if the database fails
// Warns and returns `false` for the `modified` boolean the user does not have the permission
func RemoveUserPermission(username string, permission PermissionType) error {
query, err := db.Prepare(`
DELETE FROM
hasPermission
WHERE
username=? AND Permission=?
`)
if err != nil {
log.Error("Could not remove permission: preparing query failed: ", err.Error())
return err
}
defer query.Close()
_, err = query.Exec(username, permission)
if err != nil {
log.Error("Failed to remove permission: executing query failed: ", err.Error())
return err
}
return nil
}
// Removes all permissions of a given user, used when deleting a user in order to prevent foreign key failure
// Does not validate username, additional checks required, returns an error if the database fails
func RemoveAllPermissionsOfUser(username string) error {
query, err := db.Prepare(`
DELETE FROM
hasPermission
WHERE Username=?
`)
if err != nil {
log.Error("Could not delete all permissions of user: preparing query failed: ", err.Error())
return err
}
defer query.Close()
if _, err = query.Exec(username); err != nil {
log.Error("Could not delete all permissions of user: executing query failed: ", err.Error())
return err
}
return nil
}
// Returns a list of permissions assigned to a given user, if it exists
func GetUserPermissions(username string) ([]string, error) {
query, err := db.Prepare(`
SELECT
Permission
FROM hasPermission
WHERE Username=?
`)
if err != nil {
log.Error("Could get user permissions. Failed to prepare query: ", err.Error())
return nil, err
}
defer query.Close()
res, err := query.Query(username)
if err != nil {
log.Error("Could get user permissions. Failed to execute query: ", err.Error())
return nil, err
}
defer res.Close()
permissions := make([]string, 0)
for res.Next() {
var permission string
err = res.Scan(&permission)
if err != nil {
log.Error("Could get user permissions. Failed to scan query: ", err.Error())
return nil, err
}
permissions = append(permissions, permission)
}
return permissions, nil
}
// Checks the validity of a given permission string
func DoesPermissionExist(permission string) bool {
for _, permissionItem := range Permissions {
if string(permissionItem.Permission) == permission {
return true
}
}
return false
}
// Checks if a provided user is in possession of a provided permission, can return an error, if the database fails
func UserHasPermission(username string, permission PermissionType) (bool, error) {
existentPermissions, err := GetUserPermissions(username)
if err != nil {
log.Error("Checking user permissions failed: Could not retrieve permissions: ", err.Error())
return false, err
}
for _, permissionItem := range existentPermissions {
if permissionItem == "*" || permissionItem == string(permission) {
return true, nil
}
}
return false, nil
}