Overleaf/services/web/app/coffee/Features/Compile/CompileController.coffee

Metrics = require "../../infrastructure/Metrics"
Project = require("../../models/Project").Project
CompileManager = require("./CompileManager")
ClsiManager = require("./ClsiManager")
logger  = require "logger-sharelatex"
request = require "request"
Settings = require "settings-sharelatex"
AuthenticationController = require "../Authentication/AuthenticationController"
UserGetter = require "../User/UserGetter"
RateLimiter = require("../../infrastructure/RateLimiter")

module.exports = CompileController =
	compile: (req, res, next = (error) ->) ->
		res.setTimeout(5 * 60 * 1000)
		project_id = req.params.Project_id
		isAutoCompile = !!req.query?.auto_compile
		AuthenticationController.getLoggedInUserId req, (error, user_id) ->
			return next(error) if error?
			options = {
				isAutoCompile: isAutoCompile
			}
			if req.body?.rootDoc_id?
				options.rootDoc_id = req.body.rootDoc_id
			else if req.body?.settingsOverride?.rootDoc_id? # Can be removed after deploy
				options.rootDoc_id = req.body.settingsOverride.rootDoc_id
			if req.body?.compiler
				options.compiler = req.body.compiler
			logger.log {options, project_id}, "got compile request"
			CompileManager.compile project_id, user_id, options, (error, status, outputFiles, output, limits) ->
				return next(error) if error?
				res.contentType("application/json")
				res.send 200, JSON.stringify {
					status: status
					outputFiles: outputFiles
					compileGroup: limits?.compileGroup
				}

	downloadPdf: (req, res, next = (error) ->)->
	
		Metrics.inc "pdf-downloads"
		project_id = req.params.Project_id
		isPdfjsPartialDownload = req.query?.pdfng



		rateLimit = (callback)->
			if isPdfjsPartialDownload
				callback null, true
	
			else
				rateLimitOpts =
					endpointName: "full-pdf-download"
					throttle: 100
					subjectName : req.ip
					timeInterval : 60 * 10
				RateLimiter.addCount rateLimitOpts, callback

		Project.findById project_id, {name: 1}, (err, project)->
			res.contentType("application/pdf")
			if !!req.query.popupDownload
				logger.log project_id: project_id, "download pdf as popup download"
				res.header('Content-Disposition', "attachment; filename=#{project.getSafeProjectName()}.pdf")
			else
				logger.log project_id: project_id, "download pdf to embed in browser"
				res.header('Content-Disposition', "filename=#{project.getSafeProjectName()}.pdf")

			rateLimit (err, canContinue)->
				if err?
					logger.err err:err, "error checking rate limit for pdf download"
					return res.send 500
				else if !canContinue
					logger.log project_id:project_id, ip:req.ip, "rate limit hit downloading pdf"
					res.send 500
				else
					CompileController.proxyToClsi(project_id, "/project/#{project_id}/output/output.pdf", req, res, next)

	deleteAuxFiles: (req, res, next) ->
		project_id = req.params.Project_id
		CompileManager.deleteAuxFiles project_id, (error) ->
			return next(error) if error?
			res.sendStatus(200)

	compileAndDownloadPdf: (req, res, next)->
		project_id = req.params.project_id
		CompileManager.compile project_id, null, {}, (err)->
			if err?
				logger.err err:err, project_id:project_id, "something went wrong compile and downloading pdf"
				res.sendStatus 500
			url = "/project/#{project_id}/output/output.pdf"
			CompileController.proxyToClsi project_id, url, req, res, next

	getFileFromClsi: (req, res, next = (error) ->) ->
		project_id = req.params.Project_id
		CompileController.proxyToClsi(project_id, "/project/#{project_id}/output/#{req.params.file}", req, res, next)

	proxySync: (req, res, next = (error) ->) ->
		CompileController.proxyToClsi(req.params.Project_id, req.url, req, res, next)

	proxyToClsi: (project_id, url, req, res, next = (error) ->) ->
		if req.query?.compileGroup
			CompileController.proxyToClsiWithLimits(project_id, url, {compileGroup: req.query.compileGroup}, req, res, next)
		else
			CompileManager.getProjectCompileLimits project_id, (error, limits) ->
				return next(error) if error?
				CompileController.proxyToClsiWithLimits(project_id, url, limits, req, res, next)

	proxyToClsiWithLimits: (project_id, url, limits, req, res, next = (error) ->) ->
		if limits.compileGroup == "priority"
			compilerUrl = Settings.apis.clsi_priority.url
		else
			compilerUrl = Settings.apis.clsi.url
		url = "#{compilerUrl}#{url}"
		logger.log url: url, "proxying to CLSI"
		oneMinute = 60 * 1000
		# the base request
		options = { url: url, method: req.method,	timeout: oneMinute }
		# if we have a build parameter, pass it through to the clsi
		if req.query?.pdfng && req.query?.build? # only for new pdf viewer
			options.qs = {}
			options.qs.build = req.query.build
		# if we are byte serving pdfs, pass through If-* and Range headers
		# do not send any others, there's a proxying loop if Host: is passed!
		if req.query?.pdfng
			newHeaders = {}
			for h, v of req.headers
				newHeaders[h] = req.headers[h] if h.match /^(If-|Range)/i
			options.headers = newHeaders
		proxy = request(options)
		proxy.pipe(res)
		proxy.on "error", (error) ->
			logger.warn err: error, url: url, "CLSI proxy error"

	wordCount: (req, res, next) ->
		project_id = req.params.Project_id
		file   = req.query.file || false
		CompileManager.wordCount project_id, file, (error, body) ->
			return next(error) if error?
			res.contentType("application/json")
			res.send body