forked from edmund-huber/ergonomadic
/
client_lookup_set.go
261 lines (234 loc) · 5.83 KB
/
client_lookup_set.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
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
package irc
import (
"database/sql"
"errors"
"log"
"regexp"
"strings"
)
var (
ErrNickMissing = errors.New("nick missing")
ErrNicknameInUse = errors.New("nickname in use")
ErrNicknameMismatch = errors.New("nickname mismatch")
wildMaskExpr = regexp.MustCompile(`\*|\?`)
likeQuoter = strings.NewReplacer(
`\`, `\\`,
`%`, `\%`,
`_`, `\_`,
`*`, `%`,
`?`, `_`)
)
func HasWildcards(mask string) bool {
return wildMaskExpr.MatchString(mask)
}
func ExpandUserHost(userhost Name) (expanded Name) {
expanded = userhost
// fill in missing wildcards for nicks
if !strings.Contains(expanded.String(), "!") {
expanded += "!*"
}
if !strings.Contains(expanded.String(), "@") {
expanded += "@*"
}
return
}
func QuoteLike(userhost Name) string {
return likeQuoter.Replace(userhost.String())
}
type ClientLookupSet struct {
byNick map[Name]*Client
db *ClientDB
}
func NewClientLookupSet() *ClientLookupSet {
return &ClientLookupSet{
byNick: make(map[Name]*Client),
db: NewClientDB(),
}
}
func (clients *ClientLookupSet) Get(nick Name) *Client {
return clients.byNick[nick.ToLower()]
}
func (clients *ClientLookupSet) Add(client *Client) error {
if !client.HasNick() {
return ErrNickMissing
}
if clients.Get(client.nick) != nil {
return ErrNicknameInUse
}
clients.byNick[client.Nick().ToLower()] = client
clients.db.Add(client)
return nil
}
func (clients *ClientLookupSet) Remove(client *Client) error {
if !client.HasNick() {
return ErrNickMissing
}
if clients.Get(client.nick) != client {
return ErrNicknameMismatch
}
delete(clients.byNick, client.nick.ToLower())
clients.db.Remove(client)
return nil
}
func (clients *ClientLookupSet) FindAll(userhost Name) (set ClientSet) {
userhost = ExpandUserHost(userhost)
set = make(ClientSet)
rows, err := clients.db.db.Query(
`SELECT nickname FROM client WHERE userhost LIKE ? ESCAPE '\'`,
QuoteLike(userhost))
if err != nil {
Log.error.Println("ClientLookupSet.FindAll.Query:", err)
return
}
for rows.Next() {
var sqlNickname string
err := rows.Scan(&sqlNickname)
if err != nil {
Log.error.Println("ClientLookupSet.FindAll.Scan:", err)
return
}
nickname := Name(sqlNickname)
client := clients.Get(nickname)
if client == nil {
Log.error.Println("ClientLookupSet.FindAll: missing client:", nickname)
continue
}
set.Add(client)
}
return
}
func (clients *ClientLookupSet) Find(userhost Name) *Client {
userhost = ExpandUserHost(userhost)
row := clients.db.db.QueryRow(
`SELECT nickname FROM client WHERE userhost LIKE ? ESCAPE '\' LIMIT 1`,
QuoteLike(userhost))
var nickname Name
err := row.Scan(&nickname)
if err != nil {
Log.error.Println("ClientLookupSet.Find:", err)
return nil
}
return clients.Get(nickname)
}
//
// client db
//
type ClientDB struct {
db *sql.DB
}
func NewClientDB() *ClientDB {
db := &ClientDB{
db: OpenDB(":memory:"),
}
stmts := []string{
`CREATE TABLE client (
nickname TEXT NOT NULL COLLATE NOCASE UNIQUE,
userhost TEXT NOT NULL COLLATE NOCASE,
UNIQUE (nickname, userhost) ON CONFLICT REPLACE)`,
`CREATE UNIQUE INDEX idx_nick ON client (nickname COLLATE NOCASE)`,
`CREATE UNIQUE INDEX idx_uh ON client (userhost COLLATE NOCASE)`,
}
for _, stmt := range stmts {
_, err := db.db.Exec(stmt)
if err != nil {
log.Fatal("NewClientDB: ", stmt, err)
}
}
return db
}
func (db *ClientDB) Add(client *Client) {
_, err := db.db.Exec(`INSERT INTO client (nickname, userhost) VALUES (?, ?)`,
client.Nick().String(), client.UserHost().String())
if err != nil {
Log.error.Println("ClientDB.Add:", err)
}
}
func (db *ClientDB) Remove(client *Client) {
_, err := db.db.Exec(`DELETE FROM client WHERE nickname = ?`,
client.Nick().String())
if err != nil {
Log.error.Println("ClientDB.Remove:", err)
}
}
//
// usermask to regexp
//
type UserMaskSet struct {
masks map[Name]bool
regexp *regexp.Regexp
}
func NewUserMaskSet() *UserMaskSet {
return &UserMaskSet{
masks: make(map[Name]bool),
}
}
func (set *UserMaskSet) Add(mask Name) bool {
if set.masks[mask] {
return false
}
set.masks[mask] = true
set.setRegexp()
return true
}
func (set *UserMaskSet) AddAll(masks []Name) (added bool) {
for _, mask := range masks {
if !added && !set.masks[mask] {
added = true
}
set.masks[mask] = true
}
set.setRegexp()
return
}
func (set *UserMaskSet) Remove(mask Name) bool {
if !set.masks[mask] {
return false
}
delete(set.masks, mask)
set.setRegexp()
return true
}
func (set *UserMaskSet) Match(userhost Name) bool {
if set.regexp == nil {
return false
}
return set.regexp.MatchString(userhost.String())
}
func (set *UserMaskSet) String() string {
masks := make([]string, len(set.masks))
index := 0
for mask := range set.masks {
masks[index] = mask.String()
index += 1
}
return strings.Join(masks, " ")
}
// Generate a regular expression from the set of user mask
// strings. Masks are split at the two types of wildcards, `*` and
// `?`. All the pieces are meta-escaped. `*` is replaced with `.*`,
// the regexp equivalent. Likewise, `?` is replaced with `.`. The
// parts are re-joined and finally all masks are joined into a big
// or-expression.
func (set *UserMaskSet) setRegexp() {
if len(set.masks) == 0 {
set.regexp = nil
return
}
maskExprs := make([]string, len(set.masks))
index := 0
for mask := range set.masks {
manyParts := strings.Split(mask.String(), "*")
manyExprs := make([]string, len(manyParts))
for mindex, manyPart := range manyParts {
oneParts := strings.Split(manyPart, "?")
oneExprs := make([]string, len(oneParts))
for oindex, onePart := range oneParts {
oneExprs[oindex] = regexp.QuoteMeta(onePart)
}
manyExprs[mindex] = strings.Join(oneExprs, ".")
}
maskExprs[index] = strings.Join(manyExprs, ".*")
}
expr := "^" + strings.Join(maskExprs, "|") + "$"
set.regexp, _ = regexp.Compile(expr)
}