Dropzone app thumbnail error in web2py appliances

dirman

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Oct 2, 2019, 6:15:37 AM10/2/19

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<type 'exceptions.UnicodeDecodeError'> 'utf8' codec can't decode byte 0xb7 in position 0: invalid start byte

Getting the above error as thumbnails are not showing. what could be the issue?

dirman

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Oct 5, 2019, 12:41:47 PM10/5/19

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i really need help on this

Dave S

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Oct 7, 2019, 3:11:52 AM10/7/19

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Can you show the complete stack trace? We may also need to see your controller function.

/dps

?

Message has been deleted

dirman

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Oct 7, 2019, 9:29:38 AM10/7/19

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The Dropzone app in web2py appliances

link https://github.com/mdipierro/web2py-appliances/tree/master/DropZone

dirman

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Oct 7, 2019, 9:32:49 AM10/7/19

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https://github.com/mdipierro/web2py-appliances/tree/master/DropZone

dirman

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Oct 7, 2019, 4:43:09 PM10/7/19

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<type 'exceptions.UnicodeDecodeError'> 'utf8' codec can't decode byte 0xa0 in position 0: invalid start byte

Version

web2py™	Version 2.18.5-stable+timestamp.2019.04.08.04.22.03
Python	Python 2.7.12: /usr/local/bin/uwsgi (prefix: /usr)

Traceback

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Traceback (most recent call last):
  File "/home/www-data/web2py/gluon/restricted.py", line 219, in restricted
    exec(ccode, environment)
  File "/home/www-data/web2py/applications/g/controllers/default.py", line 68, in <module>
  File "/home/www-data/web2py/gluon/globals.py", line 421, in <lambda>
    self._caller = lambda f: f()
  File "/home/www-data/web2py/gluon/cache.py", line 644, in wrapped_f
    rtn = func()
  File "/home/www-data/web2py/applications/g/controllers/default.py", line 64, in download
    return response.download(request, db)
  File "/home/www-data/web2py/gluon/globals.py", line 673, in download
    (filename, stream) = field.retrieve(name, nameonly=True)
  File "/home/www-data/web2py/gluon/packages/dal/pydal/objects.py", line 1918, in retrieve
    file_properties = self.retrieve_file_properties(name, path)
  File "/home/www-data/web2py/gluon/packages/dal/pydal/objects.py", line 1949, in retrieve_file_properties
    filename = base64.b16decode(m.group('name'), True).decode('utf-8')
  File "/usr/lib/python2.7/encodings/utf_8.py", line 16, in decode
    return codecs.utf_8_decode(input, errors, True)
UnicodeDecodeError: 'utf8' codec can't decode byte 0xa0 in position 0: invalid start byte

Error snapshot

<type 'exceptions.UnicodeDecodeError'>('utf8' codec can't decode byte 0xa0 in position 0: invalid start byte)

inspect attributes

Frames

File /home/www-data/web2py/gluon/restricted.py in restricted at line 219 code arguments variables
File /home/www-data/web2py/applications/g/controllers/default.py in <module> at line 68 code arguments variables
File /home/www-data/web2py/gluon/globals.py in <lambda> at line 421 code arguments variables
File /home/www-data/web2py/gluon/cache.py in wrapped_f at line 644 code arguments variables
File /home/www-data/web2py/applications/g/controllers/default.py in download at line 64 code arguments variables
File /home/www-data/web2py/gluon/globals.py in download at line 673 code arguments variables
File /home/www-data/web2py/gluon/packages/dal/pydal/objects.py in retrieve at line 1918 code arguments variables
File /home/www-data/web2py/gluon/packages/dal/pydal/objects.py in retrieve_file_properties at line 1949 code arguments variables

File /usr/lib/python2.7/encodings/utf_8.py in decode at line 16 code arguments variables

Function argument list

(input='\xa0\x1b\x18>\x10\x85\xe1\x11', errors='strict')

Code listing

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20. ### Codec APIs

encode = codecs.utf_8_encode

def decode(input, errors='strict'):
    return codecs.utf_8_decode(input, errors, True)

class IncrementalEncoder(codecs.IncrementalEncoder):
    def encode(self, input, final=False):
        return codecs.utf_8_encode(input, self.errors)[0]

Variables

input	'\xa0\x1b\x18>\x10\x85\xe1\x11'
builtinTrue	True
errors	'strict'
global codecs	<module 'codecs' from '/usr/lib/python2.7/codecs.pyc'>
codecs.utf_8_decode	<built-in function utf_8_decode>

Context

On Wednesday, October 2, 2019 at 10:15:37 AM UTC, dirman wrote:

dirman

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Oct 7, 2019, 4:43:53 PM10/7/19

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villas

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Oct 9, 2019, 6:34:07 AM10/9/19

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Clearly you are mixing character sets somewhere. This can happen when saving utf8 characters into a latin-1 database, for example (or vice versa).

Look for any unusual characters (with accents or symbols) in your app, data or even filenames. You can inadvertently introduce the problem by copying and pasting too.

This type of problem can be notoriously tricky to understand and track down.

The easiest thing to do is avoid the issue by converting all data to unicode and simply using unicode everywhere!

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