mirror of
https://github.com/MengMengCode/VoCat.git
synced 2026-08-13 03:13:43 +08:00
74 lines
2.4 KiB
Go
74 lines
2.4 KiB
Go
package device
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import (
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"fmt"
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"strings"
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"unicode"
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"vocat/internal/i18n"
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)
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// BlockedMCCs lists the mobile country codes whose SIM cards must not be
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// served by this product. The product does not provide service to mainland
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// China cards; the set mirrors the CN entry of the MCC table used for upstream
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// proxy routing (460/461). It is keyed by MCC with a display name for logs and
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// user-facing messaging.
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var BlockedMCCs = map[string]string{
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"460": "中国",
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"461": "中国",
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}
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// CardMCCMNC splits an IMSI into its mobile country code and mobile network
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// code. The MCC is the leading three digits and the MNC the following two or
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// three. Empty strings are returned for an unusable IMSI.
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func CardMCCMNC(imsi string) (mcc string, mnc string) {
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digits := strings.TrimSpace(imsi)
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if len(digits) < 5 ||
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strings.IndexFunc(digits, func(r rune) bool { return !unicode.IsDigit(r) }) >= 0 {
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return "", ""
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}
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mcc = digits[:3]
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mnc = digits[3:]
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if len(mnc) > 3 {
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mnc = mnc[:3]
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}
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return mcc, mnc
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}
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// RegionBlockReason returns a human-readable reason when the SIM identified by
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// the IMSI belongs to a blocked region. It returns an empty string when the
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// card is allowed or when the IMSI is unavailable: only a confirmed blocked
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// MCC triggers a block (fail-open), so a transient IMSI read failure never
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// denies service to a legitimate card.
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func RegionBlockReason(imsi string) string {
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mcc, _ := CardMCCMNC(imsi)
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country, blocked := BlockedMCCs[mcc]
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if !blocked {
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return ""
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}
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return i18n.Tf("SIM 卡归属地为%s（MCC %s），本服务不向该地区卡片提供数据/短信/VoWiFi", i18n.T(country), mcc)
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}
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// regionBlockError reports whether the currently inserted SIM must not be
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// served. It reads only the cached snapshot IMSI and never issues an extra AT
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// command, so it adds no modem round-trip and leaves guarded command
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// transcripts untouched. A missing snapshot or IMSI yields nil (fail-open);
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// the periodic region enforcement forces airplane mode as the authoritative
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// backstop.
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func (manager *Manager) regionBlockError(state *managedDevice) error {
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manager.mu.RLock()
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var snapshot *Snapshot
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if state.snapshot != nil {
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value := *state.snapshot
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snapshot = &value
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}
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manager.mu.RUnlock()
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if snapshot == nil {
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return nil
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}
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if reason := RegionBlockReason(snapshot.IMSI); reason != "" {
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return fmt.Errorf("%w: %s", ErrRegionBlocked, reason)
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}
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return nil
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}
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