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