|
| 1 | +package api |
| 2 | + |
| 3 | +import ( |
| 4 | + "crypto/rand" |
| 5 | + "crypto/sha256" |
| 6 | + "crypto/subtle" |
| 7 | + "database/sql" |
| 8 | + "encoding/base64" |
| 9 | + "encoding/hex" |
| 10 | + "errors" |
| 11 | + "strings" |
| 12 | + "time" |
| 13 | + |
| 14 | + "github.com/gin-gonic/gin" |
| 15 | +) |
| 16 | + |
| 17 | +const adminSessionDuration = 24 * time.Hour |
| 18 | + |
| 19 | +func normalizeAuthToken(headerValue string) string { |
| 20 | + token := strings.TrimSpace(headerValue) |
| 21 | + if token == "" { |
| 22 | + return "" |
| 23 | + } |
| 24 | + if strings.HasPrefix(strings.ToLower(token), "bearer ") { |
| 25 | + return strings.TrimSpace(token[7:]) |
| 26 | + } |
| 27 | + return token |
| 28 | +} |
| 29 | + |
| 30 | +func constantTimeEqual(expected string, actual string) bool { |
| 31 | + if len(expected) != len(actual) { |
| 32 | + return false |
| 33 | + } |
| 34 | + return subtle.ConstantTimeCompare([]byte(expected), []byte(actual)) == 1 |
| 35 | +} |
| 36 | + |
| 37 | +func hashSessionToken(token string) string { |
| 38 | + sum := sha256.Sum256([]byte(token)) |
| 39 | + return hex.EncodeToString(sum[:]) |
| 40 | +} |
| 41 | + |
| 42 | +func (h *Handler) isValidAdminSession(token string) (bool, error) { |
| 43 | + if token == "" { |
| 44 | + return false, nil |
| 45 | + } |
| 46 | + |
| 47 | + tokenHash := hashSessionToken(token) |
| 48 | + var expiresAt int64 |
| 49 | + err := h.db.QueryRow("SELECT expires_at FROM admin_sessions WHERE token_hash = ? LIMIT 1", tokenHash).Scan(&expiresAt) |
| 50 | + switch err { |
| 51 | + case nil: |
| 52 | + if time.Now().Unix() > expiresAt { |
| 53 | + _, _ = h.db.Exec("DELETE FROM admin_sessions WHERE token_hash = ?", tokenHash) |
| 54 | + return false, nil |
| 55 | + } |
| 56 | + return true, nil |
| 57 | + case sql.ErrNoRows: |
| 58 | + return false, nil |
| 59 | + default: |
| 60 | + return false, err |
| 61 | + } |
| 62 | +} |
| 63 | + |
| 64 | +func (h *Handler) createAdminSession(c *gin.Context) (string, time.Time, error) { |
| 65 | + expiry := time.Now().Add(adminSessionDuration) |
| 66 | + userAgent := "" |
| 67 | + ip := "" |
| 68 | + if c != nil && c.Request != nil { |
| 69 | + userAgent = c.Request.UserAgent() |
| 70 | + ip = c.ClientIP() |
| 71 | + } |
| 72 | + |
| 73 | + for i := 0; i < 3; i++ { |
| 74 | + tokenBytes := make([]byte, 32) |
| 75 | + if _, err := rand.Read(tokenBytes); err != nil { |
| 76 | + return "", time.Time{}, err |
| 77 | + } |
| 78 | + token := base64.URLEncoding.EncodeToString(tokenBytes) |
| 79 | + tokenHash := hashSessionToken(token) |
| 80 | + |
| 81 | + if _, err := h.db.Exec( |
| 82 | + "INSERT INTO admin_sessions (token_hash, expires_at, user_agent, ip) VALUES (?, ?, ?, ?)", |
| 83 | + tokenHash, |
| 84 | + expiry.Unix(), |
| 85 | + userAgent, |
| 86 | + ip, |
| 87 | + ); err != nil { |
| 88 | + continue |
| 89 | + } |
| 90 | + return token, expiry, nil |
| 91 | + } |
| 92 | + |
| 93 | + return "", time.Time{}, errors.New("failed to create session token") |
| 94 | +} |
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