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⬅️ Previous capture (2023-05-24)
-=-=-=-=-=-=-
0 package db
1
2 import (
3 "errors"
4 )
5
6 func groupAlreadyExist(group string) (error) {
7 rows, err := db.Query(
8 "SELECT * FROM groups WHERE UPPER(name) LIKE UPPER(?)",
9 group)
10 if err != nil {
11 return err
12 }
13 defer rows.Close()
14 if rows.Next() {
15 return errors.New(
16 "A group with the same name already exist")
17 }
18 return nil
19 }
20
21 func (user User) CreateGroup(group string, signature string) error {
22 if err := user.VerifySignature(signature); err != nil {
23 return err
24 }
25
26 if err := isGroupNameValid(group); err != nil {
27 return err
28 }
29
30 err := groupAlreadyExist(group)
31 if err != nil {
32 return err
33 }
34
35 rows, err := db.Exec("INSERT INTO groups " +
36 "(owner, name, description, creation) " +
37 "VALUES(?, ?, \"\", " + unixTime + ")",
38 user.ID, group)
39 if err != nil {
40 return err
41 }
42
43 groupID, err := rows.LastInsertId()
44 if err != nil {
45 return err
46 }
47
48 _, err = db.Exec("INSERT INTO member (groupID, userID) " +
49 "VALUES(?, ?)", groupID, user.ID)
50 if err != nil {
51 return err
52 }
53
54 return nil
55 }
56
57 func GetGroupDesc(name string) (string, error) {
58 query := "SELECT description FROM groups WHERE UPPER(?) = UPPER(name);"
59 rows, err := db.Query(query, name)
60 if err != nil {
61 return "", err
62 }
63 defer rows.Close()
64 if !rows.Next() {
65 return "", errors.New("Group not found")
66 }
67 var desc string
68 err = rows.Scan(&desc)
69 if err != nil {
70 return "", err
71 }
72 return desc, nil
73 }
74
75 func GetGroupID(name string) (int, error) {
76 query := "SELECT groupID FROM groups WHERE UPPER(?) = UPPER(name);"
77 rows, err := db.Query(query, name)
78 if err != nil {
79 return -1, err
80 }
81 defer rows.Close()
82 if !rows.Next() {
83 return -1, errors.New("Group not found")
84 }
85 var id int
86 err = rows.Scan(&id)
87 if err != nil {
88 return -1, err
89 }
90 return id, nil
91 }
92
93 func IsInGroup(userID int, groupID int) (error) {
94 query := "SELECT * FROM member WHERE userID=? AND groupID=?"
95 rows, err := db.Query(query, userID, groupID)
96 if err != nil {
97 return err
98 }
99 defer rows.Close()
100 if rows.Next() {
101 return errors.New("The user is already in the group")
102 }
103 return nil
104 }
105
106 func (u User) AddUserToGroup(group string, user string) error {
107 owner, err := GetGroupOwner(group)
108 if err != nil {
109 return err
110 }
111 if u.ID != owner.UserID {
112 return errors.New("only the group owner can add members")
113 }
114 id, err := GetGroupID(group)
115 if err != nil {
116 return err
117 }
118 userID, err := GetUserID(user)
119 if err != nil {
120 return err
121 }
122 if err = IsInGroup(userID, id); err != nil {
123 return err
124 }
125 _, err = db.Exec("INSERT INTO member (groupID, userID) " +
126 "VALUES(?, ?)", id, userID)
127 if err != nil {
128 return err
129 }
130 return nil
131 }
132
133 func DeleteMember(user int, group int) error {
134 statement, err := db.Exec("DELETE FROM member " +
135 "WHERE userID = ? AND groupID = ?",
136 user, group)
137 if err != nil {
138 return err
139 }
140 rows, err := statement.RowsAffected()
141 if err != nil {
142 return err
143 }
144 if rows < 1 {
145 return errors.New("The user is not a member of the group")
146 }
147 return nil
148 }
149
150 func SetGroupDescription(group int, desc string) error {
151 if len(desc) >= descriptionMaxLength {
152 return errors.New("description too long")
153 }
154 res, err := db.Exec("UPDATE groups SET description = ? " +
155 "WHERE groupID = ?", desc, group)
156 if err != nil {
157 return err
158 }
159 rows, err := res.RowsAffected()
160 if rows < 1 {
161 return errors.New("group not found")
162 }
163 return err
164 }
165
166 func DeleteGroup(group int) error {
167 statement, err := db.Exec("DELETE FROM groups " +
168 "WHERE groupID = ?", group)
169 if err != nil {
170 return err
171 }
172 rows, err := statement.RowsAffected()
173 if err != nil {
174 return err
175 }
176 if rows < 1 {
177 return errors.New("There's no such group")
178 }
179 statement, err = db.Exec("DELETE FROM member " +
180 "WHERE groupID = ?", group)
181 if err != nil {
182 return err
183 }
184 return nil
185 }
186
187 func (user User) IsInGroupID(groupID int) (bool, error) {
188 query := "SELECT owner FROM member a " +
189 "INNER JOIN groups b ON a.groupID = b.groupID " +
190 "WHERE a.userID = ? AND a.groupID = ? "
191 rows, err := db.Query(query, user.ID, groupID)
192 if err != nil {
193 return false, err
194 }
195 defer rows.Close()
196 if !rows.Next() {
197 return false, errors.New("Group not found")
198 }
199 var owner int
200 err = rows.Scan(&owner)
201 if err != nil {
202 return false, err
203 }
204 return owner == user.ID, nil
205 }
206
207 func GetGroupOwner(group string) (Member, error) {
208 query := "SELECT c.name, a.userID FROM member a " +
209 "INNER JOIN groups b ON a.groupID = b.groupID " +
210 "INNER JOIN user c ON a.userID = c.userID " +
211 "WHERE a.userID = b.owner AND b.name = ? "
212 rows, err := db.Query(query, group)
213 if err != nil {
214 return Member{}, err
215 }
216 defer rows.Close()
217 var m = Member{}
218 if rows.Next() {
219 err = rows.Scan(&m.Name, &m.UserID)
220 if err != nil {
221 return Member{}, err
222 }
223 } else {
224 return Member{}, errors.New("invalid group")
225 }
226 return m, nil
227 }
228
229 func (user User) GetMembers(group string) ([]Member, error) {
230 query := "SELECT b.Name, b.UserID FROM member a " +
231 "INNER JOIN user b ON a.userID=b.userID " +
232 "INNER JOIN groups c ON a.groupID=c.groupID " +
233 "WHERE c.name = ?"
234 rows, err := db.Query(query, group)
235 if err != nil {
236 return nil, err
237 }
238 defer rows.Close()
239 var members []Member
240 for rows.Next() {
241 var m = Member{}
242 err = rows.Scan(&m.Name, &m.UserID)
243 if err != nil {
244 return nil, err
245 }
246 members = append(members, m)
247 }
248 if len(members) == 0 {
249 return nil, errors.New("invalid group")
250 }
251 return members, nil
252 }
253
254 func (user User) IsInGroup(group string) (bool, error) {
255 id, err := GetGroupID(group)
256 if err != nil {
257 return false, err
258 }
259 return user.IsInGroupID(id)
260 }
261
262 func (user User) GetGroups() ([]Group, error) {
263 query := "SELECT a.groupID, a.name, a.description FROM groups a " +
264 "INNER JOIN member b ON a.groupID = b.groupID " +
265 "WHERE b.userID = ?"
266 rows, err := db.Query(query, user.ID)
267 if err != nil {
268 return nil, err
269 }
270 defer rows.Close()
271 var groups []Group
272 for rows.Next() {
273 var g = Group{}
274 err = rows.Scan(&g.ID, &g.Name, &g.Description)
275 if err != nil {
276 return nil, err
277 }
278 groups = append(groups, g)
279 }
280 return groups, nil
281 }
282