101 lines
3.1 KiB
Go
101 lines
3.1 KiB
Go
package api
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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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"github.com/jackc/pgx/v5"
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"golang.org/x/crypto/bcrypt"
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"git.fabledsword.com/bvandeusen/minstrel/internal/apierror"
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"git.fabledsword.com/bvandeusen/minstrel/internal/audit"
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"git.fabledsword.com/bvandeusen/minstrel/internal/db/dbq"
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)
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type resetPasswordReq struct {
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Token string `json:"token"`
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NewPassword string `json:"new_password"`
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}
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// handleResetPassword implements POST /api/auth/reset-password.
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//
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// Atomically claims the reset token and writes the new password hash.
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// Returns:
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// - 204 on successful reset
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// - 400 password_too_short if new_password < 8 chars
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// - 400 invalid_token if the token doesn't exist, was already used,
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// or has expired
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// - 500 on internal errors
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func (h *handlers) handleResetPassword(w http.ResponseWriter, r *http.Request) {
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var req resetPasswordReq
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if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
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writeErr(w, apierror.BadRequest("invalid_body", ""))
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return
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}
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if len(req.NewPassword) < minPasswordLength {
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writeErr(w, apierror.BadRequest("password_too_short", "password must be at least 8 chars"))
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return
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}
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if req.Token == "" {
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writeErr(w, apierror.BadRequest("invalid_token", ""))
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return
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}
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q := dbq.New(h.pool)
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// Look up the reset record so we know which user to update before
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// we claim the token. We can't reverse-lookup user_id after
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// UsePasswordReset (it returns rows-affected, not the row).
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reset, err := q.GetPasswordReset(r.Context(), req.Token)
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if err != nil {
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if errors.Is(err, pgx.ErrNoRows) {
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writeErr(w, apierror.BadRequest("invalid_token", ""))
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return
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}
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h.logger.Error("reset password: lookup failed", "err", err)
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writeErr(w, apierror.Internal(err))
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return
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}
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// Atomically claim the token. Returns rows-affected (1 if
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// claimable, 0 if already used / expired). We do this BEFORE
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// hashing the password so concurrent reset attempts can't both
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// succeed.
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rows, err := q.UsePasswordReset(r.Context(), req.Token)
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if err != nil {
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h.logger.Error("reset password: use token failed", "err", err)
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writeErr(w, apierror.Internal(err))
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return
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}
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if rows == 0 {
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writeErr(w, apierror.BadRequest("invalid_token", ""))
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return
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}
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// Hash and update. If hashing or update fails after the token
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// claim, the token is "burned" but the password isn't reset —
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// user has to request another. That's acceptable; bcrypt and
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// UPDATE rarely fail in healthy systems.
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hash, err := bcrypt.GenerateFromPassword([]byte(req.NewPassword), bcrypt.DefaultCost)
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if err != nil {
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h.logger.Error("reset password: hash failed", "err", err)
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writeErr(w, apierror.Internal(err))
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return
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}
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if err := q.ChangeUserPassword(r.Context(), dbq.ChangeUserPasswordParams{
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ID: reset.UserID,
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PasswordHash: string(hash),
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}); err != nil {
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h.logger.Error("reset password: update failed", "err", err)
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writeErr(w, apierror.Internal(err))
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return
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}
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if err := audit.Write(r.Context(), h.pool, reset.UserID, reset.UserID, audit.ActionPasswordResetByEmail, nil); err != nil {
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h.logger.Warn("reset password: audit failed", "err", err)
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}
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w.WriteHeader(http.StatusNoContent)
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}
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