private Response doMAILFilter()

in protocols/smtp/src/main/java/org/apache/james/protocols/smtp/core/MailCmdHandler.java [142:216]
62 lines of code
20 McCabe index (conditional complexity)

    private Response doMAILFilter(SMTPSession session, String argument) {
        String sender = null;

        if ((argument != null) && (argument.indexOf(":") > 0)) {
            int colonIndex = argument.indexOf(":");
            sender = argument.substring(colonIndex + 1);
            argument = argument.substring(0, colonIndex);
        }
        if (session.getAttachment(SMTPSession.SENDER, State.Transaction).isPresent()) {
            return SENDER_ALREADY_SPECIFIED;
        } else if (!session.getAttachment(
                SMTPSession.CURRENT_HELO_MODE, State.Connection).isPresent()
                && session.getConfiguration().useHeloEhloEnforcement()) {
            return EHLO_HELO_NEEDED;
        } else if (argument == null
                || !argument.toUpperCase(Locale.US).equals("FROM")
                || sender == null) {
            return SYNTAX_ERROR_ARG;
        } else {
            sender = sender.trim();
            // the next gt after the first lt ... AUTH may add more <>
            int lastChar = sender.indexOf('>', sender.indexOf('<'));
            // Check to see if any options are present and, if so, whether they
            // are correctly formatted
            // (separated from the closing angle bracket by a ' ').
            if ((lastChar > 0) && (sender.length() > lastChar + 2)
                    && (sender.charAt(lastChar + 1) == ' ')) {
                String mailOptionString = sender.substring(lastChar + 2);

                // Remove the options from the sender
                sender = sender.substring(0, lastChar + 1);

                StringTokenizer optionTokenizer = new StringTokenizer(
                        mailOptionString, " ");
                while (optionTokenizer.hasMoreElements()) {
                    String mailOption = optionTokenizer.nextToken();
                    int equalIndex = mailOption.indexOf('=');
                    String mailOptionName = mailOption;
                    String mailOptionValue = "";
                    if (equalIndex > 0) {
                        mailOptionName = mailOption.substring(0, equalIndex)
                                .toUpperCase(Locale.US);
                        mailOptionValue = mailOption.substring(equalIndex + 1);
                    }

                    // Handle the SIZE extension keyword

                    if (paramHooks.containsKey(mailOptionName)) {
                        MailParametersHook hook = paramHooks.get(mailOptionName);
                        SMTPResponse res = calcDefaultSMTPResponse(hook.doMailParameter(session, mailOptionName, mailOptionValue));
                        if (res != null) {
                            return res;
                        }
                    } else {
                        // Unexpected option attached to the Mail command
                        LOGGER.debug("MAIL command had unrecognized/unexpected option {} with value {}", mailOptionName, mailOptionValue);
                    }
                }
            }
            if (session.getConfiguration().useAddressBracketsEnforcement()
                    && (!sender.startsWith("<") || !sender.endsWith(">"))) {
                LOGGER.info("Error parsing sender address: {}: did not start and end with < >", sender);
                return SYNTAX_ERROR;
            }
            try {
                MaybeSender senderAddress = toMaybeSender(removeBrackets(sender));
                // Store the senderAddress in session map
                session.setAttachment(SMTPSession.SENDER, senderAddress, State.Transaction);
            } catch (Exception pe) {
                LOGGER.info("Error parsing sender address: {}", sender, pe);
                return SYNTAX_ERROR_ADDRESS;
            }
        }
        return null;
    }