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""" Copy of the original rfc6266 package, just the generation part. Orginal code is available at https://github.com/g2p/rfc6266. """ from urllib.parse import quote # RFC 2616 separator_chars = "()<>@,;:\\\"/[]?={} \t" # RFC 5987 attr_chars_nonalnum = '!#$&+-.^_`|~' def percent_encode(string, safe, encoding): return quote(string, safe, encoding, errors='strict') def is_token_char(ch): # Must be ascii, and neither a control char nor a separator char asciicode = ord(ch) # < 128 means ascii, exclude control chars at 0-31 and 127, # exclude separator characters. return 31 < asciicode < 127 and ch not in separator_chars def is_token(candidate): return all(is_token_char(ch) for ch in candidate) def is_ascii(text): return all(ord(ch) < 128 for ch in text) def fits_inside_codec(text, codec): try: text.encode(codec) except UnicodeEncodeError: return False else: return True def is_lws_safe(text): return normalize_ws(text) == text def normalize_ws(text): return ' '.join(text.split()) def qd_quote(text): return text.replace('\\', '\\\\').replace('"', '\\"') def build_header( filename, disposition='attachment', filename_compat=None ): """Generate a Content-Disposition header for a given filename. For legacy clients that don't understand the filename* parameter, a filename_compat value may be given. It should either be ascii-only (recommended) or iso-8859-1 only. In the later case it should be a character string (unicode in Python 2). Options for generating filename_compat (only useful for legacy clients): - ignore (will only send filename*); - strip accents using unicode's decomposing normalisations, which can be done from unicode data (stdlib), and keep only ascii; - use the ascii transliteration tables from Unidecode (PyPI); - use iso-8859-1 Ignore is the safest, and can be used to trigger a fallback to the document location (which can be percent-encoded utf-8 if you control the URLs). See https://tools.ietf.org/html/rfc6266#appendix-D """ # While this method exists, it could also sanitize the filename # by rejecting slashes or other weirdness that might upset a receiver. if disposition != 'attachment': assert is_token(disposition) rv = disposition if is_token(filename): rv += '; filename=%s' % (filename, ) return rv elif is_ascii(filename) and is_lws_safe(filename): qd_filename = qd_quote(filename) rv += '; filename="%s"' % (qd_filename, ) if qd_filename == filename: # RFC 6266 claims some implementations are iffy on qdtext's # backslash-escaping, we'll include filename* in that case. return rv elif filename_compat: if is_token(filename_compat): rv += '; filename=%s' % (filename_compat, ) else: assert is_lws_safe(filename_compat) rv += '; filename="%s"' % (qd_quote(filename_compat), ) # alnum are already considered always-safe, but the rest isn't. # Python encodes ~ when it shouldn't, for example. rv += "; filename*=utf-8''%s" % (percent_encode( filename, safe=attr_chars_nonalnum, encoding='utf-8'), ) # This will only encode filename_compat, if it used non-ascii iso-8859-1. return rv.encode('iso-8859-1')