forked from readium/readium-lcp-server
-
Notifications
You must be signed in to change notification settings - Fork 0
/
index.go
143 lines (128 loc) · 4.53 KB
/
index.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
// Copyright (c) 2016 Readium Foundation
//
// Redistribution and use in source and binary forms, with or without modification,
// are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this
// list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation and/or
// other materials provided with the distribution.
// 3. Neither the name of the organization nor the names of its contributors may be
// used to endorse or promote products derived from this software without specific
// prior written permission
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
// ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
package index
import (
"database/sql"
"errors"
"strings"
"github.com/fubaydullaev/readium-lcp-server/config"
)
// ErrNotFound signals content not found
var ErrNotFound = errors.New("Content not found")
// Index is an interface
type Index interface {
Get(id string) (Content, error)
Add(c Content) error
Update(c Content) error
List() func() (Content, error)
}
// Content represents an encrypted resource
type Content struct {
ID string `json:"id"`
EncryptionKey []byte `json:"-"`
Location string `json:"location"`
Length int64 `json:"length"` //not exported in license spec?
Sha256 string `json:"sha256"` //not exported in license spec?
Type string `json:"type"`
}
type dbIndex struct {
db *sql.DB
get *sql.Stmt
add *sql.Stmt
list *sql.Stmt
}
func (i dbIndex) Get(id string) (Content, error) {
records, err := i.get.Query(id)
defer records.Close()
if records.Next() {
var c Content
err = records.Scan(&c.ID, &c.EncryptionKey, &c.Location, &c.Length, &c.Sha256, &c.Type)
return c, err
}
return Content{}, ErrNotFound
}
func (i dbIndex) Add(c Content) error {
add, err := i.db.Prepare("INSERT INTO content (id,encryption_key,location,length,sha256,type) VALUES (?, ?, ?, ?, ?, ?)")
if err != nil {
return err
}
defer add.Close()
_, err = add.Exec(c.ID, c.EncryptionKey, c.Location, c.Length, c.Sha256, c.Type)
return err
}
func (i dbIndex) Update(c Content) error {
add, err := i.db.Prepare("UPDATE content SET encryption_key=? , location=?, length=?, sha256=?, type=? WHERE id=?")
if err != nil {
return err
}
defer add.Close()
_, err = add.Exec(c.EncryptionKey, c.Location, c.Length, c.Sha256, c.Type, c.ID)
return err
}
func (i dbIndex) List() func() (Content, error) {
rows, err := i.list.Query()
if err != nil {
return func() (Content, error) { return Content{}, err }
}
return func() (Content, error) {
var c Content
var err error
if rows.Next() {
err = rows.Scan(&c.ID, &c.EncryptionKey, &c.Location, &c.Length, &c.Sha256, &c.Type)
} else {
rows.Close()
err = ErrNotFound
}
return c, err
}
}
// Open opens an SQL database
func Open(db *sql.DB) (i Index, err error) {
// if sqlite, create the content table in the lcp db if it does not exist
if strings.HasPrefix(config.Config.LcpServer.Database, "sqlite") {
_, err = db.Exec(tableDef)
if err != nil {
return
}
db.Exec("ALTER TABLE content ADD COLUMN \"type\" varchar(255) NOT NULL DEFAULT 'application/epub+zip'")
}
get, err := db.Prepare("SELECT id,encryption_key,location,length,sha256,type FROM content WHERE id = ? LIMIT 1")
if err != nil {
return
}
list, err := db.Prepare("SELECT id,encryption_key,location,length,sha256,type FROM content")
if err != nil {
return
}
i = dbIndex{db, get, nil, list}
return
}
const tableDef = "CREATE TABLE IF NOT EXISTS content (" +
"id varchar(255) PRIMARY KEY," +
"encryption_key varchar(64) NOT NULL," +
"location text NOT NULL," +
"length bigint," +
"sha256 varchar(64)," +
"\"type\" varchar(256) NOT NULL default 'application/epub+zip')"