phpjs/functions/strings/sha1_file.js

php.js offers community built php functions in javascript

function sha1_file(str_filename) {
  // From: http://phpjs.org/functions
  // +   original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
  // -    depends on: file_get_contents
  // -    depends on: sha1
  // *          test: skip
  // *     example 1: sha1_file('http://kevin.vanzonneveld.net/pj_test_supportfile_1.htm');
  // *     returns 1: '40bd001563085fc35165329ea1ff5c5ecbdbbeef'

  var buf = this.file_get_contents(str_filename);

  return this.sha1(buf);
}