mirror of
https://github.com/overleaf/overleaf.git
synced 2024-11-07 20:31:06 -05:00
77 lines
2.7 KiB
JavaScript
77 lines
2.7 KiB
JavaScript
/*
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* decaffeinate suggestions:
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* DS102: Remove unnecessary code created because of implicit returns
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* DS207: Consider shorter variations of null checks
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* Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
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*/
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let OutputFileOptimiser;
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const fs = require("fs");
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const Path = require("path");
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const { spawn } = require("child_process");
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const logger = require("logger-sharelatex");
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const Metrics = require("./Metrics");
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const _ = require("underscore");
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module.exports = (OutputFileOptimiser = {
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optimiseFile(src, dst, callback) {
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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 (callback == null) { callback = function(error) {}; }
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if (src.match(/\/output\.pdf$/)) {
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return OutputFileOptimiser.checkIfPDFIsOptimised(src, function(err, isOptimised) {
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if ((err != null) || isOptimised) { return callback(null); }
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return OutputFileOptimiser.optimisePDF(src, dst, callback);
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});
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} else {
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return callback((null));
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}
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},
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checkIfPDFIsOptimised(file, callback) {
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const SIZE = 16*1024; // check the header of the pdf
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const result = new Buffer(SIZE);
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result.fill(0); // prevent leakage of uninitialised buffer
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return fs.open(file, "r", function(err, fd) {
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if (err != null) { return callback(err); }
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return fs.read(fd, result, 0, SIZE, 0, (errRead, bytesRead, buffer) =>
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fs.close(fd, function(errClose) {
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if (errRead != null) { return callback(errRead); }
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if (typeof errReadClose !== 'undefined' && errReadClose !== null) { return callback(errClose); }
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const isOptimised = buffer.toString('ascii').indexOf("/Linearized 1") >= 0;
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return callback(null, isOptimised);
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})
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);
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});
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},
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optimisePDF(src, dst, callback) {
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if (callback == null) { callback = function(error) {}; }
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const tmpOutput = dst + '.opt';
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const args = ["--linearize", src, tmpOutput];
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logger.log({args}, "running qpdf command");
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const timer = new Metrics.Timer("qpdf");
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const proc = spawn("qpdf", args);
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let stdout = "";
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proc.stdout.on("data", chunk => 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", function(err) {
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logger.warn({err, args}, "qpdf failed");
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return callback(null);
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}); // ignore the error
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return proc.on("close", function(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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}
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return fs.rename(tmpOutput, dst, function(err) {
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if (err != null) {
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logger.warn({tmpOutput, dst}, "failed to rename output of qpdf command");
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}
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return callback(null);
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});
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});
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} // ignore the error
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});
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