python 2.7 - How to get image Type and size when uploading it ? google app engine -

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i using code upload image cloud storage:

class uploadimagetocloudstorage(webapp2.requesthandler):     def post(self):         image = self.request.get("file")         gcs_file=gcs.open(gcs_bucket_name+'testimage.png', 'w')         gcs_file.write(image.encod('utf-8'))         gcs_file.close()          self.response.write("succeed !")

and form send image:

<form action="http://myappid.appspot.com/test/uploadimage" method="post">  <input type="file" name="file" value='file'><br>  <input type="submit" value="submit"> </form

how check size , type of image before saving in cloud storage ?

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if add enctype="multipart/form-data" form element, can use image data instantiate image object using code following:

(pay particular attention way mime-type extracted , split detect valid image formats, , fact we're using google.appengine.api.images class image extract dimensions after using constructor , passing raw image data)

import webapp2 import google.appengine.api.images images  class uploader(webapp2.requesthandler):     def post(self):         img_stream = self.request.get ('file')         mimetype = self.request.post['file'].type         img_format = mimetype.split('/')[1]          if (img_format == 'jpeg' or 'jpg' or 'gif' or 'png' or 'bmp' or 'tiff' or 'ico' or 'webp'):             imageobj = images.image (img_stream)             width = imageobj.width             height = imageobj.height             self.response.out.write ('<html><body>uploaded image %s x %s [%s]</body></html>' % (width, height, img_format))         else:             self.response.out.write ('not valid format')

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