51 lines
1.7 KiB
Python
51 lines
1.7 KiB
Python
import re
|
|
|
|
from django.core.exceptions import ValidationError
|
|
|
|
import debug # pyflakes:ignore
|
|
|
|
def get_cleaned_text_file_content(uploaded_file):
|
|
"""Read uploaded file, try to fix up encoding to UTF-8 and
|
|
transform line endings into Unix style, then return the content as
|
|
a UTF-8 string. Errors are reported as
|
|
django.core.exceptions.ValidationError exceptions."""
|
|
|
|
if not uploaded_file:
|
|
return u""
|
|
|
|
if uploaded_file.size and uploaded_file.size > 10 * 1000 * 1000:
|
|
raise ValidationError("Text file too large (size %s)." % uploaded_file.size)
|
|
|
|
content = "".join(uploaded_file.chunks())
|
|
|
|
# try to fixup encoding
|
|
import magic
|
|
if hasattr(magic, "open"):
|
|
m = magic.open(magic.MAGIC_MIME)
|
|
m.load()
|
|
filetype = m.buffer(content)
|
|
else:
|
|
m = magic.Magic()
|
|
m.cookie = magic.magic_open(magic.MAGIC_NONE | magic.MAGIC_MIME | magic.MAGIC_MIME_ENCODING)
|
|
magic.magic_load(m.cookie, None)
|
|
filetype = m.from_buffer(content)
|
|
|
|
if not filetype.startswith("text"):
|
|
raise ValidationError("Uploaded file does not appear to be a text file.")
|
|
|
|
match = re.search("charset=([\w-]+)", filetype)
|
|
if not match:
|
|
raise ValidationError("File has unknown encoding.")
|
|
|
|
encoding = match.group(1)
|
|
if "ascii" not in encoding:
|
|
try:
|
|
content = content.decode(encoding)
|
|
except Exception as e:
|
|
raise ValidationError("Error decoding file (%s). Try submitting with UTF-8 encoding or remove non-ASCII characters." % str(e))
|
|
|
|
# turn line-endings into Unix style
|
|
content = content.replace("\r\n", "\n").replace("\r", "\n")
|
|
|
|
return content.encode("utf-8")
|