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55 lines
1.9 KiB
CoffeeScript
55 lines
1.9 KiB
CoffeeScript
fs = require "fs"
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Path = require "path"
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spawn = require("child_process").spawn
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logger = require "logger-sharelatex"
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Metrics = require "./Metrics"
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_ = require "underscore"
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module.exports = OutputFileOptimiser =
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optimiseFile: (src, dst, callback = (error) ->) ->
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# check output file (src) and see if we can optimise it, storing
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# the result in the build directory (dst)
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if src.match(/\/output\.pdf$/)
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OutputFileOptimiser.checkIfPDFIsOptimised src, (err, isOptimised) ->
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return callback(null) if err? or isOptimised
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OutputFileOptimiser.optimisePDF src, dst, callback
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else
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callback (null)
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checkIfPDFIsOptimised: (file, callback) ->
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SIZE = 16*1024 # check the header of the pdf
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result = new Buffer(SIZE)
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result.fill(0) # prevent leakage of uninitialised buffer
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fs.open file, "r", (err, fd) ->
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return callback(err) if err?
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fs.read fd, result, 0, SIZE, 0, (errRead, bytesRead, buffer) ->
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fs.close fd, (errClose) ->
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return callback(errRead) if errRead?
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return callback(errClose) if errReadClose?
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isOptimised = buffer.toString('ascii').indexOf("/Linearized 1") >= 0
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callback(null, isOptimised)
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optimisePDF: (src, dst, callback = (error) ->) ->
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tmpOutput = dst + '.opt'
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args = ["--linearize", src, tmpOutput]
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logger.log args: args, "running qpdf command"
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timer = new Metrics.Timer("qpdf")
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proc = spawn("qpdf", args)
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stdout = ""
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proc.stdout.on "data", (chunk) ->
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stdout += chunk.toString()
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callback = _.once(callback) # avoid double call back for error and close event
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proc.on "error", (err) ->
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logger.warn {err, args}, "qpdf failed"
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callback(null) # ignore the error
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proc.on "close", (code) ->
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timer.done()
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if code != 0
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logger.warn {code, args}, "qpdf returned error"
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return callback(null) # ignore the error
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fs.rename tmpOutput, dst, (err) ->
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if err?
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logger.warn {tmpOutput, dst}, "failed to rename output of qpdf command"
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callback(null) # ignore the error
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