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37 lines
1.2 KiB
CoffeeScript
37 lines
1.2 KiB
CoffeeScript
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settings = require 'settings-sharelatex'
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logger = require 'logger-sharelatex'
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request = require 'request'
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URL = require 'url'
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module.exports = ProxyManager =
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call: (req, res, next) ->
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requestUrl = URL.parse(req.url)
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requestPath = requestUrl.pathname # ignore the query part
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target = settings.proxyUrls[requestPath]
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return next() unless target? # nothing to proxy
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targetUrl = makeTargetUrl(target, req.query)
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logger.log targetUrl: targetUrl, reqUrl: req.url, "proxying url"
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upstream = request(targetUrl)
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upstream.on "error", (error) ->
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logger.error err: error, "error in ProxyManager"
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# TODO: better handling of status code
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# see https://github.com/overleaf/write_latex/wiki/Streams-and-pipes-in-Node.js
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upstream.pipe(res)
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# make a URL from a proxy target.
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# if the query is specified, set/replace the target's query with the given query
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makeTargetUrl = (target, query) ->
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targetUrl = URL.parse(parseSettingUrl(target))
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if query? and Object.keys(query).length > 0
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targetUrl.query = query
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targetUrl.search = null # clear `search` as it takes precedence over `query`
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targetUrl.format()
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parseSettingUrl = (target) ->
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return target if typeof target is 'string'
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"#{target.baseUrl}#{target.path or ''}"
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