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Image Uploading in Ruby

/ Published in: Ruby
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Checks to make sure the file is a valid image file, checks max file size, and directory write permissions, requires 'fileutils' gem.

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  1. def do_image_upload(theFile)
  2.     # You should reall set these two in a config.
  3.     maxFilesize = 10485760
  4.     fileDir = "public/files"
  5.  
  6.     fileName = Time.now.to_i.to_s + '-' + rand(36**8).to_s(36) + File.extname(theFile[:filename])
  7.     filePath = File.join(fileDir, fileName)
  8.  
  9.     tempFile = theFile[:tempfile]
  10.  
  11.     upload = {
  12.         :fileSize => tempFile.size,
  13.         :originalFileName => theFile[:filename],
  14.         :fileType => theFile[:type],
  15.         :fileName => fileName,
  16.         :filePath => filePath
  17.     }
  18.  
  19.     if upload[:fileType] != 'image/png' && upload[:fileType] != 'image/jpeg' && upload[:fileType] != 'image/gif'
  20.         return {'fileError' => 'FileType not allowed.'}
  21.     end
  22.     if upload[:fileSize] > maxFileSize
  23.         return {'fileError' => 'FileSize too large.'}
  24.     end
  25.  
  26.     if !File.directory?(fileDir)
  27.         return {'fileError' => 'Destination ' + directory + ' does not exist.'}
  28.     end
  29.  
  30.     if !File.writable?(fileDir)
  31.         return {'fileError' => 'Cannot write to ' + directory + '.'}
  32.     end
  33.  
  34.     File.open(filePath, "wb") { |f| f.write(tempFile.read) }
  35.  
  36.     return upload
  37. end

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