Flask: Get the size of request.files object
Question:
I want to get the size of uploading image to control if it is greater than max file upload limit. I tried this one:
@app.route("/new/photo",methods=["POST"])
def newPhoto():
form_photo = request.files['post-photo']
print form_photo.content_length
It printed 0. What am I doing wrong? Should I find the size of this image from the temp path of it? Is there anything like PHP’s $_FILES['foo']['size'] in Python?
Answers:
The proper way to set a max file upload limit is via the MAX_CONTENT_LENGTH app configuration. For example, if you wanted to set an upload limit of 16 megabytes, you would do the following to your app configuration:
app.config['MAX_CONTENT_LENGTH'] = 16 * 1024 * 1024
If the uploaded file is too large, Flask will automatically return status code 413 Request Entity Too Large – this should be handled on the client side.
As someone else already suggested, you should use the
app.config['MAX_CONTENT_LENGTH']
to restrict file sizes. But
Since you specifically want to find out the image size, you can do:
import os
photo_size = os.stat(request.files['post-photo']).st_size
print photo_size
There are a few things to be aware of here – the content_length property will be the content length of the file upload as reported by the browser, but unfortunately many browsers dont send this, as noted in the docs and source.
As for your TypeError, the next thing to be aware of is that file uploads under 500KB are stored in memory as a StringIO object, rather than spooled to disk (see those docs again), so your stat call will fail.
MAX_CONTENT_LENGTH is the correct way to reject file uploads larger than you want, and if you need it, the only reliable way to determine the length of the data is to figure it out after you’ve handled the upload – either stat the file after you’ve .save()d it:
request.files['file'].save('/tmp/foo')
size = os.stat('/tmp/foo').st_size
Or if you’re not using the disk (for example storing it in a database), count the bytes you’ve read:
blob = request.files['file'].read()
size = len(blob)
Though obviously be careful you’re not reading too much data into memory if your MAX_CONTENT_LENGTH is very large
If you don’t want save the file to disk first, use the following code, this work on in-memory stream
import os
file = request.files['file']
file.seek(0, os.SEEK_END)
file_length = file.tell()
otherwise, this will better
request.files['file'].save('/tmp/file')
file_length = os.stat('/tmp/file').st_size
The following section of the code should meet your purpose..
form_photo.seek(0,2)
size = form_photo.tell()
You can go by popen from os import
save it first
photo=request.files['post-photo']
photo.save('tmp')
now, just get the size
os.popen('ls -l tmp | cut -d " " -f5').read()
- this in bytes
- for Megabytes or Gigabytes, use the flag –b M or –b G
I want to get the size of uploading image to control if it is greater than max file upload limit. I tried this one:
@app.route("/new/photo",methods=["POST"])
def newPhoto():
form_photo = request.files['post-photo']
print form_photo.content_length
It printed 0. What am I doing wrong? Should I find the size of this image from the temp path of it? Is there anything like PHP’s $_FILES['foo']['size'] in Python?
The proper way to set a max file upload limit is via the MAX_CONTENT_LENGTH app configuration. For example, if you wanted to set an upload limit of 16 megabytes, you would do the following to your app configuration:
app.config['MAX_CONTENT_LENGTH'] = 16 * 1024 * 1024
If the uploaded file is too large, Flask will automatically return status code 413 Request Entity Too Large – this should be handled on the client side.
As someone else already suggested, you should use the
app.config['MAX_CONTENT_LENGTH']
to restrict file sizes. But
Since you specifically want to find out the image size, you can do:
import os
photo_size = os.stat(request.files['post-photo']).st_size
print photo_size
There are a few things to be aware of here – the content_length property will be the content length of the file upload as reported by the browser, but unfortunately many browsers dont send this, as noted in the docs and source.
As for your TypeError, the next thing to be aware of is that file uploads under 500KB are stored in memory as a StringIO object, rather than spooled to disk (see those docs again), so your stat call will fail.
MAX_CONTENT_LENGTH is the correct way to reject file uploads larger than you want, and if you need it, the only reliable way to determine the length of the data is to figure it out after you’ve handled the upload – either stat the file after you’ve .save()d it:
request.files['file'].save('/tmp/foo')
size = os.stat('/tmp/foo').st_size
Or if you’re not using the disk (for example storing it in a database), count the bytes you’ve read:
blob = request.files['file'].read()
size = len(blob)
Though obviously be careful you’re not reading too much data into memory if your MAX_CONTENT_LENGTH is very large
If you don’t want save the file to disk first, use the following code, this work on in-memory stream
import os
file = request.files['file']
file.seek(0, os.SEEK_END)
file_length = file.tell()
otherwise, this will better
request.files['file'].save('/tmp/file')
file_length = os.stat('/tmp/file').st_size
The following section of the code should meet your purpose..
form_photo.seek(0,2) size = form_photo.tell()
You can go by popen from os import
save it first
photo=request.files['post-photo']
photo.save('tmp')
now, just get the size
os.popen('ls -l tmp | cut -d " " -f5').read()
- this in bytes
- for Megabytes or Gigabytes, use the flag –b M or –b G