139 lines
2.8 KiB
Go
139 lines
2.8 KiB
Go
package main
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import (
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"encoding/json"
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"errors"
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"net/http"
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"time"
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"github.com/dgraph-io/badger/v4"
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)
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const cookieDBKey = "cookie:423down"
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var errCookieNotFound = errors.New("cookie not found")
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type DB struct {
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client *badger.DB
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}
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func NewDB(path string) (*DB, error) {
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db, err := badger.Open(badger.DefaultOptions(path))
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if err != nil {
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return nil, err
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}
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return &DB{
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client: db,
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}, nil
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}
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func (d *DB) GetArticleHtml(articleID string) (string, error) {
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var valueCopy []byte
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err := d.client.View(func(txn *badger.Txn) error {
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item, err := txn.Get([]byte("article:" + articleID))
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if err != nil {
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return err
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}
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return item.Value(func(val []byte) error {
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valueCopy = append(valueCopy, val...)
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return nil
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})
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})
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if err != nil {
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return "", err
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}
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return string(valueCopy), nil
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}
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func (d *DB) SetArticleHtml(articleID string, html string, ttl time.Duration) error {
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if ttl <= 0 {
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return errors.New("ttl 必须大于 0")
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}
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return d.client.Update(func(txn *badger.Txn) error {
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entry := badger.NewEntry([]byte("article:"+articleID), []byte(html)).WithTTL(ttl)
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return txn.SetEntry(entry)
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})
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}
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// GetCookie 读取缓存中的登录 Cookie。
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func (d *DB) GetCookie() ([]*http.Cookie, error) {
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var valueCopy []byte
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err := d.client.View(func(txn *badger.Txn) error {
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item, err := txn.Get([]byte(cookieDBKey))
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if err != nil {
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return err
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}
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return item.Value(func(val []byte) error {
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valueCopy = append(valueCopy, val...)
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return nil
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})
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})
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if errors.Is(err, badger.ErrKeyNotFound) {
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return nil, errCookieNotFound
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}
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if err != nil {
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return nil, err
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}
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var cookies []*http.Cookie
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if err := json.Unmarshal(valueCopy, &cookies); err != nil {
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return nil, err
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}
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if len(cookies) == 0 {
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return nil, errCookieNotFound
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}
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return cookies, nil
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}
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// SetCookie 保存登录 Cookie，有效期固定为 7 天。
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func (d *DB) SetCookie(cookies []*http.Cookie) error {
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if len(cookies) == 0 {
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return errors.New("cookies 不能为空")
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}
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data, err := json.Marshal(cookies)
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if err != nil {
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return err
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}
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return d.client.Update(func(txn *badger.Txn) error {
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entry := badger.NewEntry([]byte(cookieDBKey), data).WithTTL(cookieCacheTTL)
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return txn.SetEntry(entry)
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})
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}
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// AddCookie 增加或更新单个登录 Cookie，并刷新 7 天有效期。
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func (d *DB) AddCookie(cookie *http.Cookie) error {
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if cookie == nil {
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return errors.New("cookie 不能为空")
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}
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cookies, err := d.GetCookie()
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if err != nil && !errors.Is(err, errCookieNotFound) {
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return err
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}
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replaced := false
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for i, existingCookie := range cookies {
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if existingCookie.Name == cookie.Name {
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cookies[i] = cookie
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replaced = true
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break
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}
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}
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if !replaced {
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cookies = append(cookies, cookie)
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}
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return d.SetCookie(cookies)
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}
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func (d *DB) Close() error {
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return d.client.Close()
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}
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