Base64编码的连接codeD字符串文件（Ruby on Rails的） [英] Base64 encoded string to file(Ruby on Rails)

问题描述

我在那里有一个zip文件使用Base64编码技术进行编码后发送到RoR应用程序的要求。我应该去code，它保存为zip文件并解压，并做一些操作。他们发送的压缩文件EN codeD数据作为一个名为拉链通过POST方法的参数。在这里，是我在code做了。

I have a requirement where a zip file is sent to the ROR application after encoding it with Base64 encoding. I should decode it, save it as a zipfile and unzip it and do some operations. They are sending the zip file encoded data as a parameter called zip through POST method. Here, is what I have done in code.

require 'rubygems'
require 'zip/zip'
require 'base64'

def get_pdf
  encoded_data = Base64.decode64(params[:zip])
  File.open("#{RAILS_ROOT}/zip_archive/zip_file.zip", "w") {|f| f.write encoded_data}
  unzip_file("#{RAILS_ROOT}/zip_archive/zip_file.zip", "#{RAILS_ROOT}/unzipped/")
  ...(using @file_path, do stuff)
end

def unzip_file (file, destination)
  destination = File.join(destination, File.basename(file, ".zip"))
  Zip::ZipFile.open(file) { |zip_file|
    zip_file.each { |f|
      f_path=File.join(destination, f.name)
      FileUtils.mkdir_p(File.dirname(f_path))
      zip_file.extract(f, f_path) unless File.exist?(f_path)
    }
  }
  @file_path = destination
end

不过，我不能够正确地保存zip文件。保存后的文件是给在解压缩的部分错误。

But, I am not able to save the zip file correctly. The file after saving is giving error on the unzipping part.

Zip::ZipError (Zip end of central directory signature not found):
  rubyzip (0.9.4) lib/zip/zip.rb:1287:in `get_e_o_c_d'
  rubyzip (0.9.4) lib/zip/zip.rb:1235:in `read_e_o_c_d'
  rubyzip (0.9.4) lib/zip/zip.rb:1260:in `read_from_stream'
  rubyzip (0.9.4) lib/zip/zip.rb:1392:in `initialize'
  rubyzip (0.9.4) lib/zip/zip.rb:1392:in `open'
  rubyzip (0.9.4) lib/zip/zip.rb:1392:in `initialize'
  rubyzip (0.9.4) lib/zip/zip.rb:1410:in `new'
  rubyzip (0.9.4) lib/zip/zip.rb:1410:in `open'
  app/controllers/pdf_controller.rb:37:in `unzip_file'
  app/controllers/pdf_controller.rb:13:in `get_pdf'

当我试图打开该应用程序还，文件没有得到打开外面说文件

When I tried to open the file outside the app also, the file was not getting opened saying

[/home/prince/Desktop/test_project/zip_archive/zip_file.zip]
  End-of-central-directory signature not found.  Either this file is not
  a zipfile, or it constitutes one disk of a multi-part archive.  In the
  latter case the central directory and zipfile comment will be found on
  the last disk(s) of this archive.
zipinfo:  cannot find zipfile directory in one of /home/prince/Desktop/test_project/zip_archive/zip_file.zip or
          /home/prince/Desktop/test_project/zip_archive/zip_file.zip.zip, and cannot find /home/prince/Desktop/test_project/zip_archive/zip_file.zip.ZIP, period.

我试着将文件保存为 File.open（..，世行）写在二进制模式的内容，但后来也出现同样的错误发生。我应该做任何的 PARAMS [：拉链] 解码之前？

I tried saving the file with File.open("..", "wb") to write the contents in the binary mode, but then also the same error occurs. Should I do anything to the params[:zip] before decoding it?

推荐答案

工程就像一个魅力。在文件＃打开块应该写正确并关闭文件，你可能只是有在某处有错误的道路。如果 File.exists？和去code64经历了，你应该是好的。

Works like a charm. The File#open block should properly write and close the file, you're probably just having the wrong path in there somewhere. If the File.exists? and the decode64 went through, you should be good.

ruby-1.9.2-p0 > zip = "UEsDBAoAAAAAAKphcT4AAAAAAAAAAAAAAAAFABwAZW1wdHlVVAkAA8/sgU3P\n7IFNdXgLAAEE9QEAAAQUAAAAUEsBAh4DCgAAAAAAqmFxPgAAAAAAAAAAAAAA\nAAUAGAAAAAAAAAAAAKSBAAAAAGVtcHR5VVQFAAPP7IFNdXgLAAEE9QEAAAQU\nAAAAUEsFBgAAAAABAAEASwAAAD8AAAAAAA==\n"
ruby-1.9.2-p0 > File.open('test2.zip', 'wb') {|f| f.write(Base64.decode64(zip))}
 => 160 
ruby-1.9.2-p0 > Zip::ZipFile.open('test2.zip') {|z| z.each {|f| puts f.name}}
empty
 => [empty] 

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