change zip size check to spawn

services/web/app/coffee/Features/Uploads/ArchiveManager.coffee

@@ -3,30 +3,68 @@ logger  = require "logger-sharelatex"
 metrics = require "../../infrastructure/Metrics"
 fs      = require "fs"
 Path    = require "path"
+_ = require("underscore")
 
 ONE_MEG = 1024 * 1024
 
 module.exports = ArchiveManager =
+
+
+	_isZipTooLarge: (source, callback = (err, isTooLarge)->)->
+		callback = _.once callback
+
+		unzip = child.spawn("unzip", ["-l", source])
+
+		output = ""
+		unzip.stdout.on "data", (d)->
+			output += d
+
+		error = null
+		unzip.stderr.on "data", (chunk) ->
+			error ||= ""
+			error += chunk
+
+		unzip.on "error", (err) ->
+			logger.error {err, source, destination}, "unzip failed"
+			if err.code == "ENOENT"
+				logger.error "unzip command not found. Please check the unzip command is installed"
+			callback(err)
+
+		unzip.on "exit", () ->
+			if error?
+				error = new Error(error)
+				logger.error err:error, source: source, destination: destination, "error checking zip size"
+
+			lines = output.split("\n")
+			lastLine = lines[lines.length - 2]?.trim()
+			totalSizeInBytes = lastLine?.split(" ")?[0]
+
+			totalSizeInBytes = parseInt(totalSizeInBytes)
+
+			if !totalSizeInBytes? or isNaN(totalSizeInBytes)
+				logger.err source:source, "error getting bytes of zip"
+				return callback(new Error("something went wrong"))
+
+			isTooLarge = totalSizeInBytes > (ONE_MEG * 300)
+
+			callback(error, isTooLarge)
+
+
+
+
+					
 	extractZipArchive: (source, destination, _callback = (err) ->) ->
 		callback = (args...) ->
 			_callback(args...)
 			_callback = () ->
 
-		child.exec "unzip -l #{source} | tail -n 1", (err, result)->
+		ArchiveManager._isZipTooLarge source, (err, isTooLarge)->
 			if err?
 				logger.err err:err, "error checking size of zip file"
 				return callback(err)
 
-			totalSizeInBytes = result.trim()?.split(" ")?[0]
-			
-			if !totalSizeInBytes?
-				logger.err source:source, "error getting bytes of zip"
-				return callback(new Error("something went wrong"))
-
-			if totalSizeInBytes > ONE_MEG * 300
-				logger.log source:source, totalSizeInBytes:totalSizeInBytes, "zip file too large"
-				return callback(new Error("zip_too_large"))
-					
+			if isTooLarge
+				return callback(new Error("zip_too_large"))		
 
 
 			timer = new metrics.Timer("unzipDirectory")

services/web/test/UnitTests/coffee/Uploads/ArchiveManagerTests.coffee

@@ -1,4 +1,5 @@
 sinon = require('sinon')
+expect = require("chai").expect
 chai = require('chai')
 should = chai.should()
 modulePath = "../../../../app/js/Features/Uploads/ArchiveManager.js"
@@ -9,13 +10,16 @@ describe "ArchiveManager", ->
 	beforeEach ->
 		@logger =
 			error: sinon.stub()
+			err:->
 			log: sinon.stub()
 		@process = new events.EventEmitter
 		@process.stdout = new events.EventEmitter
 		@process.stderr = new events.EventEmitter
+
 		@child =
 			spawn: sinon.stub().returns(@process)
-			exec: sinon.stub().callsArgWith(1, null, "   109042                   2 files")
+
+
 		@metrics =
 			Timer: class Timer
 				done: sinon.stub()
@@ -30,6 +34,7 @@ describe "ArchiveManager", ->
 			@source = "/path/to/zip/source.zip"
 			@destination = "/path/to/zip/destination"
 			@callback = sinon.stub()
+			@ArchiveManager._isZipTooLarge = sinon.stub().callsArgWith(1, null, false)
 
 		describe "successfully", ->
 			beforeEach (done) ->
@@ -61,7 +66,7 @@ describe "ArchiveManager", ->
 
 		describe "with a zip that is too large", ->
 			beforeEach (done) ->
-				@child.exec = sinon.stub().callsArgWith(1, null, "   10000000000009042                   2 files")
+				@ArchiveManager._isZipTooLarge = sinon.stub().callsArgWith(1, null, true)
 				@ArchiveManager.extractZipArchive @source, @destination, (error) =>
 					@callback(error)
 					done()
@@ -85,6 +90,45 @@ describe "ArchiveManager", ->
 			it "should log out the error", ->
 				@logger.error.called.should.equal true
 	
+	describe "_isZipTooLarge", ->
+		beforeEach ->
+			@output = (totalSize)->"  Length     Date   Time    Name \n--------    ----   ----    ---- \n241  03-12-16 12:20   main.tex \n108801  03-12-16 12:20   ddd/x1J5kHh.jpg \n--------                   ------- \n#{totalSize}                   2 files\n"
+
+		it "should return false with small output", (done)->
+			@ArchiveManager._isZipTooLarge @source, (error, isTooLarge) =>
+				isTooLarge.should.equal false
+				done()
+			@process.stdout.emit "data", @output("109042")
+			@process.emit "exit"
+
+		it "should return true with large bytes", (done)->
+			@ArchiveManager._isZipTooLarge @source, (error, isTooLarge) =>
+				isTooLarge.should.equal true
+				done()
+			@process.stdout.emit "data", @output("1090000000000000042")
+			@process.emit "exit"
+
+		it "should return error on no data", (done)->
+			@ArchiveManager._isZipTooLarge @source, (error, isTooLarge) =>
+				expect(error).to.exist
+				done()
+			@process.stdout.emit "data", ""
+			@process.emit "exit"
+
+		it "should return error if it didn't get a number", (done)->
+			@ArchiveManager._isZipTooLarge @source, (error, isTooLarge) =>
+				expect(error).to.exist
+				done()
+			@process.stdout.emit "data", @output("total_size_string")
+			@process.emit "exit"
+
+		it "should return error if the is only a bit of data", (done)->
+			@ArchiveManager._isZipTooLarge @source, (error, isTooLarge) =>
+				expect(error).to.exist
+				done()
+			@process.stdout.emit "data", "  Length     Date   Time    Name \n--------"
+			@process.emit "exit"
+
 	describe "findTopLevelDirectory", ->
 		beforeEach ->
 			@fs.readdir = sinon.stub()