File size: 5,984 Bytes
daa8246 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 | package middleware
import (
"context"
"fmt"
"net/http"
"time"
"github.com/QuantumNous/new-api/common"
"github.com/gin-gonic/gin"
)
var timeFormat = "2006-01-02T15:04:05.000Z"
var inMemoryRateLimiter common.InMemoryRateLimiter
var defNext = func(c *gin.Context) {
c.Next()
}
func redisRateLimiter(c *gin.Context, maxRequestNum int, duration int64, mark string) {
ctx := context.Background()
rdb := common.RDB
key := "rateLimit:" + mark + c.ClientIP()
listLength, err := rdb.LLen(ctx, key).Result()
if err != nil {
fmt.Println(err.Error())
c.Status(http.StatusInternalServerError)
c.Abort()
return
}
if listLength < int64(maxRequestNum) {
rdb.LPush(ctx, key, time.Now().Format(timeFormat))
rdb.Expire(ctx, key, common.RateLimitKeyExpirationDuration)
} else {
oldTimeStr, _ := rdb.LIndex(ctx, key, -1).Result()
oldTime, err := time.Parse(timeFormat, oldTimeStr)
if err != nil {
fmt.Println(err)
c.Status(http.StatusInternalServerError)
c.Abort()
return
}
nowTimeStr := time.Now().Format(timeFormat)
nowTime, err := time.Parse(timeFormat, nowTimeStr)
if err != nil {
fmt.Println(err)
c.Status(http.StatusInternalServerError)
c.Abort()
return
}
// time.Since will return negative number!
// See: https://stackoverflow.com/questions/50970900/why-is-time-since-returning-negative-durations-on-windows
if int64(nowTime.Sub(oldTime).Seconds()) < duration {
rdb.Expire(ctx, key, common.RateLimitKeyExpirationDuration)
c.Status(http.StatusTooManyRequests)
c.Abort()
return
} else {
rdb.LPush(ctx, key, time.Now().Format(timeFormat))
rdb.LTrim(ctx, key, 0, int64(maxRequestNum-1))
rdb.Expire(ctx, key, common.RateLimitKeyExpirationDuration)
}
}
}
func memoryRateLimiter(c *gin.Context, maxRequestNum int, duration int64, mark string) {
key := mark + c.ClientIP()
if !inMemoryRateLimiter.Request(key, maxRequestNum, duration) {
c.Status(http.StatusTooManyRequests)
c.Abort()
return
}
}
func rateLimitFactory(maxRequestNum int, duration int64, mark string) func(c *gin.Context) {
if common.RedisEnabled {
return func(c *gin.Context) {
redisRateLimiter(c, maxRequestNum, duration, mark)
}
} else {
// It's safe to call multi times.
inMemoryRateLimiter.Init(common.RateLimitKeyExpirationDuration)
return func(c *gin.Context) {
memoryRateLimiter(c, maxRequestNum, duration, mark)
}
}
}
func GlobalWebRateLimit() func(c *gin.Context) {
if common.GlobalWebRateLimitEnable {
return rateLimitFactory(common.GlobalWebRateLimitNum, common.GlobalWebRateLimitDuration, "GW")
}
return defNext
}
func GlobalAPIRateLimit() func(c *gin.Context) {
if common.GlobalApiRateLimitEnable {
return rateLimitFactory(common.GlobalApiRateLimitNum, common.GlobalApiRateLimitDuration, "GA")
}
return defNext
}
func CriticalRateLimit() func(c *gin.Context) {
if common.CriticalRateLimitEnable {
return rateLimitFactory(common.CriticalRateLimitNum, common.CriticalRateLimitDuration, "CT")
}
return defNext
}
func DownloadRateLimit() func(c *gin.Context) {
return rateLimitFactory(common.DownloadRateLimitNum, common.DownloadRateLimitDuration, "DW")
}
func UploadRateLimit() func(c *gin.Context) {
return rateLimitFactory(common.UploadRateLimitNum, common.UploadRateLimitDuration, "UP")
}
// userRateLimitFactory creates a rate limiter keyed by authenticated user ID
// instead of client IP, making it resistant to proxy rotation attacks.
// Must be used AFTER authentication middleware (UserAuth).
func userRateLimitFactory(maxRequestNum int, duration int64, mark string) func(c *gin.Context) {
if common.RedisEnabled {
return func(c *gin.Context) {
userId := c.GetInt("id")
if userId == 0 {
c.Status(http.StatusUnauthorized)
c.Abort()
return
}
key := fmt.Sprintf("rateLimit:%s:user:%d", mark, userId)
userRedisRateLimiter(c, maxRequestNum, duration, key)
}
}
// It's safe to call multi times.
inMemoryRateLimiter.Init(common.RateLimitKeyExpirationDuration)
return func(c *gin.Context) {
userId := c.GetInt("id")
if userId == 0 {
c.Status(http.StatusUnauthorized)
c.Abort()
return
}
key := fmt.Sprintf("%s:user:%d", mark, userId)
if !inMemoryRateLimiter.Request(key, maxRequestNum, duration) {
c.Status(http.StatusTooManyRequests)
c.Abort()
return
}
}
}
// userRedisRateLimiter is like redisRateLimiter but accepts a pre-built key
// (to support user-ID-based keys).
func userRedisRateLimiter(c *gin.Context, maxRequestNum int, duration int64, key string) {
ctx := context.Background()
rdb := common.RDB
listLength, err := rdb.LLen(ctx, key).Result()
if err != nil {
fmt.Println(err.Error())
c.Status(http.StatusInternalServerError)
c.Abort()
return
}
if listLength < int64(maxRequestNum) {
rdb.LPush(ctx, key, time.Now().Format(timeFormat))
rdb.Expire(ctx, key, common.RateLimitKeyExpirationDuration)
} else {
oldTimeStr, _ := rdb.LIndex(ctx, key, -1).Result()
oldTime, err := time.Parse(timeFormat, oldTimeStr)
if err != nil {
fmt.Println(err)
c.Status(http.StatusInternalServerError)
c.Abort()
return
}
nowTimeStr := time.Now().Format(timeFormat)
nowTime, err := time.Parse(timeFormat, nowTimeStr)
if err != nil {
fmt.Println(err)
c.Status(http.StatusInternalServerError)
c.Abort()
return
}
if int64(nowTime.Sub(oldTime).Seconds()) < duration {
rdb.Expire(ctx, key, common.RateLimitKeyExpirationDuration)
c.Status(http.StatusTooManyRequests)
c.Abort()
return
} else {
rdb.LPush(ctx, key, time.Now().Format(timeFormat))
rdb.LTrim(ctx, key, 0, int64(maxRequestNum-1))
rdb.Expire(ctx, key, common.RateLimitKeyExpirationDuration)
}
}
}
// SearchRateLimit returns a per-user rate limiter for search endpoints.
// 10 requests per 60 seconds per user (by user ID, not IP).
func SearchRateLimit() func(c *gin.Context) {
return userRateLimitFactory(common.SearchRateLimitNum, common.SearchRateLimitDuration, "SR")
}
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