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41 lines
1.4 KiB
CoffeeScript
41 lines
1.4 KiB
CoffeeScript
RateLimiter = require "../../infrastructure/RateLimiter"
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logger = require "logger-sharelatex"
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AuthenticationController = require('../Authentication/AuthenticationController')
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module.exports = RateLimiterMiddleware =
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###
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Do not allow more than opts.maxRequests from a single client in
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opts.timeInterval. Pass an array of opts.params to segment this based on
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parameters in the request URL, e.g.:
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app.get "/project/:project_id", RateLimiterMiddleware.rateLimit(endpointName: "open-editor", params: ["project_id"])
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will rate limit each project_id separately.
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Unique clients are identified by user_id if logged in, and IP address if not.
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###
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rateLimit: (opts) ->
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return (req, res, next) ->
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user_id = AuthenticationController.getLoggedInUserId(req) || req.ip
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params = (opts.params or []).map (p) -> req.params[p]
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params.push user_id
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subjectName = params.join(":")
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if opts.ipOnly
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subjectName = req.ip
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if !opts.endpointName?
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throw new Error("no endpointName provided")
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options = {
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endpointName: opts.endpointName
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timeInterval: opts.timeInterval or 60
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subjectName: subjectName
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throttle: opts.maxRequests or 6
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}
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RateLimiter.addCount options, (error, canContinue)->
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return next(error) if error?
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if canContinue
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next()
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else
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logger.warn options, "rate limit exceeded"
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res.status(429) # Too many requests
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res.write("Rate limit reached, please try again later")
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res.end()
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