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25 lines
1 KiB
CoffeeScript
25 lines
1 KiB
CoffeeScript
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Path = require("path")
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fs = require("fs")
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Settings = require("settings-sharelatex")
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logger = require("logger-sharelatex")
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url = require "url"
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module.exports = ForbidSymlinks = (staticFn, root, options) ->
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expressStatic = staticFn root, options
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basePath = Path.resolve(root)
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return (req, res, next) ->
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path = url.parse(req.url)?.pathname
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requestedFsPath = Path.normalize("#{basePath}/#{path}")
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fs.realpath requestedFsPath, (err, realFsPath)->
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if err?
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logger.warn err:err, requestedFsPath:requestedFsPath, realFsPath:realFsPath, path: req.params[0], project_id: req.params.project_id, "error checking file access"
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if err.code == 'ENOENT'
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return res.sendStatus(404)
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else
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return res.sendStatus(500)
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else if requestedFsPath != realFsPath
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logger.warn requestedFsPath:requestedFsPath, realFsPath:realFsPath, path: req.params[0], project_id: req.params.project_id, "trying to access a different file (symlink), aborting"
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return res.sendStatus(404)
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else
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expressStatic(req, res, next)
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