forked from alterminal/alterminal
69 lines
2.0 KiB
Go
69 lines
2.0 KiB
Go
package auth
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import (
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"log"
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"net/http"
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"strings"
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"gorm.io/gorm"
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)
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// LogoutHandler 處理 POST /logout，依 Content-Type 分流（與登入一致）：
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// 表單走瀏覽器流程（需通過 CSRF 驗證，失敗時以 403 重繪目前狀態頁），
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// JSON 走 API 流程。登出為冪等操作——查無 Session 亦視為成功；資料庫
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// 刪除失敗僅記錄，仍清除 Cookie 並回應成功（Session 最遲於效期到期失效）。
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func LogoutHandler(db *gorm.DB) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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ct := r.Header.Get("Content-Type")
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var isForm bool
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switch {
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case strings.HasPrefix(ct, "application/json"):
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case strings.HasPrefix(ct, "application/x-www-form-urlencoded"),
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strings.HasPrefix(ct, "multipart/form-data"):
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isForm = true
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default:
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WriteError(w, http.StatusUnsupportedMediaType, "Content-Type 須為 application/json 或表單")
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return
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}
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if isForm {
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if err := r.ParseForm(); err != nil {
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renderAccountPage(w, r, db, http.StatusBadRequest, "無法解析表單內容")
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return
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}
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if !VerifyCSRF(r) {
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renderAccountPage(w, r, db, http.StatusForbidden, "表單驗證失敗，請重新整理頁面後再試")
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return
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}
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}
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if c, err := r.Cookie(CookieName); err == nil {
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if err := DeleteSession(db, c.Value); err != nil {
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log.Printf("logout: %v", err)
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}
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}
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clearSessionCookie(w, r)
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if isForm {
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// PRG：以 303 導向 /login 顯示登入表單，避免重新整理重複送出。
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http.Redirect(w, r, "/login", http.StatusSeeOther)
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return
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}
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w.WriteHeader(http.StatusNoContent)
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}
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}
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// clearSessionCookie 以 Max-Age=0 清除瀏覽器的 Session Cookie（與
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// setSessionCookie 對稱，屬性一致以免因 Path 或 Secure 差異清不掉）。
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func clearSessionCookie(w http.ResponseWriter, r *http.Request) {
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http.SetCookie(w, &http.Cookie{
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Name: CookieName,
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Value: "",
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Path: "/",
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MaxAge: -1,
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HttpOnly: true,
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SameSite: http.SameSiteLaxMode,
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Secure: r.TLS != nil,
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})
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}
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