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35 lines
1,010 B
CoffeeScript
35 lines
1,010 B
CoffeeScript
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crypto = require "crypto"
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logger = require("logger-sharelatex")
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fs = require("fs")
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_ = require("underscore")
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module.exports = FileHashManager =
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computeHash: (filePath, callback = (error, hashValue) ->) ->
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callback = _.once(callback) # avoid double callbacks
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# taken from v1/history/storage/lib/blob_hash.js
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getGitBlobHeader = (byteLength) ->
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return 'blob ' + byteLength + '\x00'
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getByteLengthOfFile = (cb) ->
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fs.stat filePath, (err, stats) ->
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return cb(err) if err?
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cb(null, stats.size)
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getByteLengthOfFile (err, byteLength) ->
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return callback(err) if err?
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input = fs.createReadStream(filePath)
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input.on 'error', (err) ->
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logger.err {filePath: filePath, err:err}, "error opening file in computeHash"
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return callback(err)
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hash = crypto.createHash("sha1")
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hash.setEncoding('hex')
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hash.update(getGitBlobHeader(byteLength))
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hash.on 'readable', () ->
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result = hash.read()
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if result?
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callback(null, result.toString('hex'))
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input.pipe(hash)
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