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This module handles the content transfer encoding method defined in RFC 2045 to encode arbitrary 8-bit data using the three 8-bit bytes in four 7-bit characters encoding known as Base64. It is used in the MIME standards for email to attach images, audio, and text using some 8-bit character sets to messages. This module provides an interface to encode and decode both headers and bodies with Base64 encoding. RFC 2045 defines a method for including character set information in an `encoded-word' in a header. This method is commonly used for 8-bit real names in To:, From:, Cc:, etc. fields, as well as Subject: lines. This module does not do the line wrapping or end-of-line character conversion necessary for proper internationalized headers; it only does dumb encoding and decoding. To deal with the various line wrapping issues, use the email.header module. """ __all__ = [ 'base64_len', 'body_decode', 'body_encode', 'decode', 'decodestring', 'encode', 'encodestring', 'header_encode', ] from binascii import b2a_base64, a2b_base64 from email.utils import fix_eols CRLF = '\r\n' NL = '\n' EMPTYSTRING = '' # See also Charset.py MISC_LEN = 7 # Helpers def base64_len(s): """Return the length of s when it is encoded with base64.""" groups_of_3, leftover = divmod(len(s), 3) # 4 bytes out for each 3 bytes (or nonzero fraction thereof) in. # Thanks, Tim! n = groups_of_3 * 4 if leftover: n += 4 return n def header_encode(header, charset='iso-8859-1', keep_eols=False, maxlinelen=76, eol=NL): """Encode a single header line with Base64 encoding in a given charset. Defined in RFC 2045, this Base64 encoding is identical to normal Base64 encoding, except that each line must be intelligently wrapped (respecting the Base64 encoding), and subsequent lines must start with a space. charset names the character set to use to encode the header. It defaults to iso-8859-1. End-of-line characters (\\r, \\n, \\r\\n) will be automatically converted to the canonical email line separator \\r\\n unless the keep_eols parameter is True (the default is False). Each line of the header will be terminated in the value of eol, which defaults to "\\n". Set this to "\\r\\n" if you are using the result of this function directly in email. The resulting string will be in the form: "=?charset?b?WW/5ciBtYXp66XLrIHf8eiBhIGhhbXBzdGHuciBBIFlv+XIgbWF6euly?=\\n =?charset?b?6yB3/HogYSBoYW1wc3Rh7nIgQkMgWW/5ciBtYXp66XLrIHf8eiBhIGhh?=" with each line wrapped at, at most, maxlinelen characters (defaults to 76 characters). """ # Return empty headers unchanged if not header: return header if not keep_eols: header = fix_eols(header) # Base64 encode each line, in encoded chunks no greater than maxlinelen in # length, after the RFC chrome is added in. base64ed = [] max_encoded = maxlinelen - len(charset) - MISC_LEN max_unencoded = max_encoded * 3 // 4 for i in range(0, len(header), max_unencoded): base64ed.append(b2a_base64(header[i:i+max_unencoded])) # Now add the RFC chrome to each encoded chunk lines = [] for line in base64ed: # Ignore the last character of each line if it is a newline if line.endswith(NL): line = line[:-1] # Add the chrome lines.append('=?%s?b?%s?=' % (charset, line)) # Glue the lines together and return it. BAW: should we be able to # specify the leading whitespace in the joiner? joiner = eol + ' ' return joiner.join(lines) def encode(s, binary=True, maxlinelen=76, eol=NL): """Encode a string with base64. Each line will be wrapped at, at most, maxlinelen characters (defaults to 76 characters). If binary is False, end-of-line characters will be converted to the canonical email end-of-line sequence \\r\\n. Otherwise they will be left verbatim (this is the default). Each line of encoded text will end with eol, which defaults to "\\n". Set this to "\\r\\n" if you will be using the result of this function directly in an email. """ if not s: return s if not binary: s = fix_eols(s) encvec = [] max_unencoded = maxlinelen * 3 // 4 for i in range(0, len(s), max_unencoded): # BAW: should encode() inherit b2a_base64()'s dubious behavior in # adding a newline to the encoded string? enc = b2a_base64(s[i:i + max_unencoded]) if enc.endswith(NL) and eol != NL: enc = enc[:-1] + eol encvec.append(enc) return EMPTYSTRING.join(encvec) # For convenience and backwards compatibility w/ standard base64 module body_encode = encode encodestring = encode def decode(s, convert_eols=None): """Decode a raw base64 string. If convert_eols is set to a string value, all canonical email linefeeds, e.g. "\\r\\n", in the decoded text will be converted to the value of convert_eols. os.linesep is a good choice for convert_eols if you are decoding a text attachment. This function does not parse a full MIME header value encoded with base64 (like =?iso-8859-1?b?bmloISBuaWgh?=) -- please use the high level email.header class for that functionality. """ if not s: return s dec = a2b_base64(s) if convert_eols: return dec.replace(CRLF, convert_eols) return dec # For convenience and backwards compatibility w/ standard base64 module body_decode = decode decodestring = decode