143 lines
3.2 KiB
Go
143 lines
3.2 KiB
Go
package reqctx
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import (
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"context"
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"crypto/rand"
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"encoding/binary"
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"math/big"
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"net"
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"strings"
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"time"
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"spark-server/internal/pkg/i18n"
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)
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type ctxKey struct{}
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// RequestContext is the per-request identity. Use RealIP for rate limit and audit, never 127.0.0.1 from gnet.RemoteAddr.
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type RequestContext struct {
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RequestID string
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UserID int64
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DeviceID uint64
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Language string
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AppVersion string
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ConnectionID string
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RemoteAddr string
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RealIP string
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JTI string
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TokenExpires time.Time
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}
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func With(ctx context.Context, rc *RequestContext) context.Context {
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return context.WithValue(ctx, ctxKey{}, rc)
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}
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func From(ctx context.Context) *RequestContext {
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rc, _ := ctx.Value(ctxKey{}).(*RequestContext)
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return rc
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}
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// RealIP returns the client IP from context (PROXY / X-Real-IP), not gnet RemoteAddr.
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func RealIP(ctx context.Context) string {
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if rc := From(ctx); rc != nil {
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return rc.RealIP
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}
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return ""
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}
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// RequestID returns the server-generated request id stored on context.
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func RequestID(ctx context.Context) string {
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if rc := From(ctx); rc != nil {
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return rc.RequestID
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}
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return ""
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}
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// Lang is the canonical UI language (zh-CN / en / zh-TW) for errors and notifications.
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func Lang(ctx context.Context) i18n.Lang {
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if rc := From(ctx); rc != nil {
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return i18n.Parse(rc.Language)
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}
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return i18n.Default
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}
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// Language returns the canonical language tag stored on context.
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func Language(ctx context.Context) string {
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return Lang(ctx).String()
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}
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// ParseHTTPRealIP prefers X-Real-IP, then X-Forwarded-For, then RemoteAddr host.
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func ParseHTTPRealIP(realIPHeader, forwardedFor, remoteAddr string) string {
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if ip := strings.TrimSpace(realIPHeader); ip != "" {
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return stripHost(ip)
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}
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if forwardedFor != "" {
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first, _, _ := strings.Cut(forwardedFor, ",")
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if ip := stripHost(strings.TrimSpace(first)); ip != "" {
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return ip
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}
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}
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return stripHost(remoteAddr)
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}
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func stripHost(v string) string {
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v = strings.TrimSpace(v)
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if v == "" {
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return ""
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}
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host, _, err := net.SplitHostPort(v)
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if err == nil {
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return host
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}
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return v
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}
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const (
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base62Alphabet = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
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base62Len = 11
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objectNameLen = 16
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objectNameSrc = 12
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)
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// NewID returns an 8-byte base62 id (11 chars) for request_id and JWT jti.
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func NewID() string {
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var b [8]byte
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if _, err := rand.Read(b[:]); err != nil {
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return "00000000000"
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}
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return encodeBase62(binary.BigEndian.Uint64(b[:]))
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}
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// NewObjectName returns a 12-byte base62 id (16 chars) for object_key filenames. Not Snowflake.
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func NewObjectName() string {
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return randomBase62(objectNameSrc, objectNameLen)
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}
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func encodeBase62(n uint64) string {
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var out [base62Len]byte
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for i := base62Len - 1; i >= 0; i-- {
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out[i] = base62Alphabet[n%62]
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n /= 62
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}
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return string(out[:])
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}
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func randomBase62(byteN, width int) string {
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if byteN < 1 || width < 1 {
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return ""
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}
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b := make([]byte, byteN)
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if _, err := rand.Read(b); err != nil {
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return strings.Repeat("0", width)
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}
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n := new(big.Int).SetBytes(b)
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out := make([]byte, width)
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base := big.NewInt(62)
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r := new(big.Int)
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for i := width - 1; i >= 0; i-- {
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n.DivMod(n, base, r)
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out[i] = base62Alphabet[r.Int64()]
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}
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return string(out)
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}
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