126 lines
4.5 KiB
Go
126 lines
4.5 KiB
Go
package api
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import (
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"fmt"
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"log"
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"net/http"
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"strings"
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"time"
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"felis.lolicon.best/internal/metrics"
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)
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// Account change notices tell the owner of an account, at the verified address,
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// that a way into it was just added, removed or moved: a passkey registered or
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// removed, the email replaced (that notice goes to the OLD address, which is the
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// one the owner still reads if someone else made the change). They carry the time
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// and the source address and say what to do if the change was not theirs.
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// Best effort, like the lock notice: the change already happened.
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// notifyAccountChange mails one notice to the given address.
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func (a *API) notifyAccountChange(r *http.Request, to, subject, body string) {
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if to == "" {
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return
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}
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sender, ok := a.Mailer.(noticeSender)
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if !ok {
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log.Printf("auth: no notice mailer; account change notice %q was not sent (request_id=%s)",
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subject, requestIDFromContext(r.Context()))
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return
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}
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if ok, _ := a.mailGate().take(mailGateKey); !ok {
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metrics.MailTotal.WithLabelValues("notice", "throttled").Inc()
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log.Printf("auth: mail budget spent; account change notice %q was not sent (request_id=%s)",
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subject, requestIDFromContext(r.Context()))
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return
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}
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if err := sender.SendNotice(r.Context(), to, subject, body); err != nil {
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metrics.MailTotal.WithLabelValues("notice", "failed").Inc()
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log.Printf("auth: account change notice failed (request_id=%s): %v", requestIDFromContext(r.Context()), err)
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return
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}
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metrics.MailTotal.WithLabelValues("notice", "sent").Inc()
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}
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// verifiedEmail is where a notice about p's account goes: the address it proved,
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// or nothing.
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func verifiedEmail(p *Principal) string {
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if !p.EmailVerified {
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return ""
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}
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return p.Email
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}
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func (a *API) notifyPasskeyAdded(r *http.Request, p *Principal) {
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subject, body := accountChangeNotice(
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"已添加 Passkey", "passkey added",
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"你的 Felis 账户刚刚添加了一个 Passkey。", "A passkey was just added to your Felis account.",
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"删除这个 Passkey", "remove that passkey",
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a.now(), a.noticeIP(r))
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a.notifyAccountChange(r, verifiedEmail(p), subject, body)
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}
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func (a *API) notifyPasskeyRemoved(r *http.Request, p *Principal) {
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subject, body := accountChangeNotice(
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"已删除 Passkey", "passkey removed",
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"你的 Felis 账户刚刚删除了一个 Passkey，其它设备上的登录已全部退出。",
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"A passkey was just removed from your Felis account, and every other device was signed out.",
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"检查剩下的 Passkey", "check the passkeys that remain",
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a.now(), a.noticeIP(r))
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a.notifyAccountChange(r, verifiedEmail(p), subject, body)
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}
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// notifyEmailChanged tells the previous verified address where the account's
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// mail now goes, masked so the notice does not hand the new address to whoever
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// reads the old mailbox.
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func (a *API) notifyEmailChanged(r *http.Request, oldEmail, newEmail string) {
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masked := maskEmail(newEmail)
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subject, body := accountChangeNotice(
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"邮箱已更换", "email changed",
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"你的 Felis 账户的邮箱刚刚更换为 "+masked+"，这个地址以后不会再收到登录验证码。",
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"The email on your Felis account was just changed to "+masked+". This address will no longer receive sign-in codes.",
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"把邮箱改回来", "change the email back",
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a.now(), a.noticeIP(r))
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a.notifyAccountChange(r, oldEmail, subject, body)
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}
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func (a *API) noticeIP(r *http.Request) string {
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if ip := a.clientIP(r); ip.IsValid() {
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return ip.String()
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}
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return ""
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}
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// accountChangeNotice renders a bilingual notice. zhUndo/enUndo name the step
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// that reverses the change, for the "if this wasn't you" line.
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func accountChangeNotice(zhTitle, enTitle, zhWhat, enWhat, zhUndo, enUndo string, at time.Time, ip string) (subject, body string) {
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when := at.UTC().Format("2006-01-02 15:04 MST")
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zhIP, enIP := ip, ip
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if ip == "" {
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zhIP, enIP = "未知", "unknown"
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}
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subject = "Felis " + zhTitle + " · " + enTitle
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body = fmt.Sprintf(`%s
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时间：%s
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来源 IP：%s
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如果不是你本人操作，请立即登录 Felis，在账户页%s并退出其它设备，然后联系服务器管理员。
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%s
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Time: %s
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From IP: %s
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If this wasn't you, sign in to Felis now, %s and sign out other devices on the Account page, then contact the server operator.
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`, zhWhat, when, zhIP, zhUndo, enWhat, when, enIP, enUndo)
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return subject, body
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}
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// maskEmail keeps the first character of the local part and the domain:
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// [email protected] → a***@example.com.
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func maskEmail(email string) string {
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at := strings.LastIndexByte(email, '@')
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if at <= 0 {
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return "***"
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}
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first := []rune(email[:at])[0]
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return string(first) + "***" + email[at:]
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}
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