71 lines
2.1 KiB
Go
71 lines
2.1 KiB
Go
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/*
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GoToSocial
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Copyright (C) 2021-2022 GoToSocial Authors admin@gotosocial.org
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package security
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import (
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"net"
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"net/http"
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"time"
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"github.com/gin-gonic/gin"
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limiter "github.com/ulule/limiter/v3"
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mgin "github.com/ulule/limiter/v3/drivers/middleware/gin"
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memory "github.com/ulule/limiter/v3/drivers/store/memory"
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)
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type RateLimitOptions struct {
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Period time.Duration
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Limit int64
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}
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func (m *Module) LimitReachedHandler(c *gin.Context) {
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code := http.StatusTooManyRequests
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c.AbortWithStatusJSON(code, gin.H{"error": "rate limit reached"})
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}
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// returns a gin middleware that will automatically rate limit caller (by IP address)
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// and enrich the response header with the following headers:
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// - `x-ratelimit-limit` maximum number of requests allowed per time period (fixed)
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// - `x-ratelimit-remaining` number of remaining requests that can still be performed
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// - `x-ratelimit-reset` unix timestamp when the rate limit will reset
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// if `x-ratelimit-limit` is exceeded an HTTP 429 error is returned
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func (m *Module) RateLimit(rateOptions RateLimitOptions) func(c *gin.Context) {
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rate := limiter.Rate{
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Period: rateOptions.Period,
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Limit: rateOptions.Limit,
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}
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store := memory.NewStore()
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limiterInstance := limiter.New(
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store,
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rate,
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// apply /64 mask to IPv6 addresses
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limiter.WithIPv6Mask(net.CIDRMask(64, 128)),
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)
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middleware := mgin.NewMiddleware(
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limiterInstance,
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// use custom rate limit reached error
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mgin.WithLimitReachedHandler(m.LimitReachedHandler),
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)
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return middleware
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}
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