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path: root/filter-rewrite-reply-to.go
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/*
 * Copyright (c) 2021 Sebastian Riley Rasor <https://www.sebastianrasor.com/contact>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

package main

import (
	"bufio"
	"flag"
	"fmt"
	"log"
	"os"
	"strings"
	"net/mail"
	"regexp"
)

var version string

var outputChannel chan string

var filters = map[string]func(string, []string){
	"data-line": filterDataLine,
}

func produceOutput(msgType string, sessionId string, token string, format string, parameter ...string) {
	var out string

	if version < "0.5" {
		out = msgType + "|" + token + "|" + sessionId
	} else {
		out = msgType + "|" + sessionId + "|" + token
	}
	out += "|" + fmt.Sprintf(format)
	for k := range parameter {
		out += "|" + fmt.Sprintf(parameter[k])
	}

	outputChannel <- out
}

var re = regexp.MustCompile(`\.(aaa|aarp|abarth|abb|abbott|abbvie|abc|able|abogado|abudhabi|ac|academy|accenture|accountant|accountants|aco|actor|ad|adac|ads|adult|ae|aeg|aero|aetna|af|afamilycompany|afl|africa|ag|agakhan|agency|ai|aig|airbus|airforce|airtel|akdn|al|alfaromeo|alibaba|alipay|allfinanz|allstate|ally|alsace|alstom|am|amazon|americanexpress|americanfamily|amex|amfam|amica|amsterdam|analytics|android|anquan|anz|ao|aol|apartments|app|apple|aq|aquarelle|ar|arab|aramco|archi|army|arpa|art|arte|as|asda|asia|associates|at|athleta|attorney|au|auction|audi|audible|audio|auspost|author|auto|autos|avianca|aw|aws|ax|axa|az|azure|ba|baby|baidu|banamex|bananarepublic|band|bank|bar|barcelona|barclaycard|barclays|barefoot|bargains|baseball|basketball|bauhaus|bayern|bb|bbc|bbt|bbva|bcg|bcn|bd|be|beats|beauty|beer|bentley|berlin|best|bestbuy|bet|bf|bg|bh|bharti|bi|bible|bid|bike|bing|bingo|bio|biz|bj|black|blackfriday|blockbuster|blog|bloomberg|blue|bm|bms|bmw|bn|bnpparibas|bo|boats|boehringer|bofa|bom|bond|boo|book|booking|bosch|bostik|boston|bot|boutique|box|br|bradesco|bridgestone|broadway|broker|brother|brussels|bs|bt|budapest|bugatti|build|builders|business|buy|buzz|bv|bw|by|bz|bzh|ca|cab|cafe|cal|call|calvinklein|cam|camera|camp|cancerresearch|canon|capetown|capital|capitalone|car|caravan|cards|care|career|careers|cars|casa|case|cash|casino|cat|catering|catholic|cba|cbn|cbre|cbs|cc|cd|center|ceo|cern|cf|cfa|cfd|cg|ch|chanel|channel|charity|chase|chat|cheap|chintai|christmas|chrome|church|ci|cipriani|circle|cisco|citadel|citi|citic|city|cityeats|ck|cl|claims|cleaning|click|clinic|clinique|clothing|cloud|club|clubmed|cm|cn|co|coach|codes|coffee|college|cologne|com|comcast|commbank|community|company|compare|computer|comsec|condos|construction|consulting|contact|contractors|cooking|cookingchannel|cool|coop|corsica|country|coupon|coupons|courses|cpa|cr|credit|creditcard|creditunion|cricket|crown|crs|cruise|cruises|csc|cu|cuisinella|cv|cw|cx|cy|cymru|cyou|cz|dabur|dad|dance|data|date|dating|datsun|day|dclk|dds|de|deal|dealer|deals|degree|delivery|dell|deloitte|delta|democrat|dental|dentist|desi|design|dev|dhl|diamonds|diet|digital|direct|directory|discount|discover|dish|diy|dj|dk|dm|dnp|do|docs|doctor|dog|domains|dot|download|drive|dtv|dubai|duck|dunlop|dupont|durban|dvag|dvr|dz|earth|eat|ec|eco|edeka|edu|education|ee|eg|email|emerck|energy|engineer|engineering|enterprises|epson|equipment|er|ericsson|erni|es|esq|estate|et|etisalat|eu|eurovision|eus|events|exchange|expert|exposed|express|extraspace|fage|fail|fairwinds|faith|family|fan|fans|farm|farmers|fashion|fast|fedex|feedback|ferrari|ferrero|fi|fiat|fidelity|fido|film|final|finance|financial|fire|firestone|firmdale|fish|fishing|fit|fitness|fj|fk|flickr|flights|flir|florist|flowers|fly|fm|fo|foo|food|foodnetwork|football|ford|forex|forsale|forum|foundation|fox|fr|free|fresenius|frl|frogans|frontdoor|frontier|ftr|fujitsu|fun|fund|furniture|futbol|fyi|ga|gal|gallery|gallo|gallup|game|games|gap|garden|gay|gb|gbiz|gd|gdn|ge|gea|gent|genting|george|gf|gg|ggee|gh|gi|gift|gifts|gives|giving|gl|glade|glass|gle|global|globo|gm|gmail|gmbh|gmo|gmx|gn|godaddy|gold|goldpoint|golf|goo|goodyear|goog|google|gop|got|gov|gp|gq|gr|grainger|graphics|gratis|green|gripe|grocery|group|gs|gt|gu|guardian|gucci|guge|guide|guitars|guru|gw|gy|hair|hamburg|hangout|haus|hbo|hdfc|hdfcbank|health|healthcare|help|helsinki|here|hermes|hgtv|hiphop|hisamitsu|hitachi|hiv|hk|hkt|hm|hn|hockey|holdings|holiday|homedepot|homegoods|homes|homesense|honda|horse|hospital|host|hosting|hot|hoteles|hotels|hotmail|house|how|hr|hsbc|ht|hu|hughes|hyatt|hyundai|ibm|icbc|ice|icu|id|ie|ieee|ifm|ikano|il|im|imamat|imdb|immo|immobilien|in|inc|industries|infiniti|info|ing|ink|institute|insurance|insure|int|international|intuit|investments|io|ipiranga|iq|ir|irish|is|ismaili|ist|istanbul|it|itau|itv|jaguar|java|jcb|je|jeep|jetzt|jewelry|jio|jll|jm|jmp|jnj|jo|jobs|joburg|jot|joy|jp|jpmorgan|jprs|juegos|juniper|kaufen|kddi|ke|kerryhotels|kerrylogistics|kerryproperties|kfh|kg|kh|ki|kia|kim|kinder|kindle|kitchen|kiwi|km|kn|koeln|komatsu|kosher|kp|kpmg|kpn|kr|krd|kred|kuokgroup|kw|ky|kyoto|kz|la|lacaixa|lamborghini|lamer|lancaster|lancia|land|landrover|lanxess|lasalle|lat|latino|latrobe|law|lawyer|lb|lc|lds|lease|leclerc|lefrak|legal|lego|lexus|lgbt|li|lidl|life|lifeinsurance|lifestyle|lighting|like|lilly|limited|limo|lincoln|linde|link|lipsy|live|living|lixil|lk|llc|llp|loan|loans|locker|locus|loft|lol|london|lotte|lotto|love|lpl|lplfinancial|lr|ls|lt|ltd|ltda|lu|lundbeck|luxe|luxury|lv|ly|ma|macys|madrid|maif|maison|makeup|man|management|mango|map|market|marketing|markets|marriott|marshalls|maserati|mattel|mba|mc|mckinsey|md|me|med|media|meet|melbourne|meme|memorial|men|menu|merckmsd|mg|mh|miami|microsoft|mil|mini|mint|mit|mitsubishi|mk|ml|mlb|mls|mm|mma|mn|mo|mobi|mobile|moda|moe|moi|mom|monash|money|monster|mormon|mortgage|moscow|moto|motorcycles|mov|movie|mp|mq|mr|ms|msd|mt|mtn|mtr|mu|museum|mutual|mv|mw|mx|my|mz|na|nab|nagoy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ro|zip|zm|zone|zuerich|zw)$`)

var data = map[string][]string{}

func filterDataLine(sessionId string, params []string) {
	token := params[0]

	data[sessionId] = append(data[sessionId], params[1])

	if params[1] == "." {
		var msg = strings.Join(data[sessionId], "\n")
		var header mail.Header
		r := strings.NewReader(msg)
		m, err := mail.ReadMessage(r)
		if err != nil {
			println(err)
			goto End
		} else {
			header = m.Header
		}

		//header := m.Header
		if header.Get("Reply-To") == "" {
			e, err := mail.ParseAddress(header.Get("To"))
			if err != nil {
				println(err);
				goto End
			}
			if re.MatchString(e.Address) {
				e, err = mail.ParseAddress(header.Get("From"))
				if err != nil {
					println(err);
					goto End
				}
				parts := strings.Split(e.Address, "@")
				replyTo := parts[0] + "_" + parts[1] + "@hmail.app"
				if e.Name != "" {
					replyTo = e.Name + " <" + parts[0] + "_" + parts[1] + "@hmail.app>"
				} else {
					replyTo = parts[0] + "_" + parts[1] + "@hmail.app"
				}
				var fromIndex int
				for k := range data[sessionId] {
					if strings.HasPrefix(strings.ToLower(data[sessionId][k]), "from: ") {
						fromIndex = k
					}
				}
				data[sessionId] = append(data[sessionId][:fromIndex+1], data[sessionId][fromIndex:]...)
				data[sessionId][fromIndex] = "Reply-To: " + replyTo
			}
		}
		End:
			for k := range data[sessionId] {
				produceOutput("filter-dataline", sessionId, token, data[sessionId][k])
			}
			delete(data, sessionId)
	}
}

func filterInit() {
	for k := range filters {
		fmt.Printf("register|filter|smtp-in|%s\n", k)
	}
	fmt.Println("register|ready")
}

func trigger(currentSlice map[string]func(string, []string), atoms []string) {
	if handler, ok := currentSlice[atoms[4]]; ok {
		handler(atoms[5], atoms[6:])
	} else {
		log.Fatalf("invalid phase: %s", atoms[4])
	}
}

func skipConfig(scanner *bufio.Scanner) {
	for {
		if !scanner.Scan() {
			os.Exit(0)
		}
		line := scanner.Text()
		if line == "config|ready" {
			return
		}
	}
}

func main() {
	flag.Parse()
	scanner := bufio.NewScanner(os.Stdin)
	skipConfig(scanner)
	filterInit()

	outputChannel = make(chan string)
	go func() {
		for line := range outputChannel {
			fmt.Println(line)
		}
	}()

	for {
		if !scanner.Scan() {
			os.Exit(0)
		}

		line := scanner.Text()
		atoms := strings.Split(line, "|")
		if len(atoms) < 6 {
			log.Fatalf("missing atoms: %s", line)
		}

		version = atoms[1]

		if atoms[0] != "filter" {
			log.Fatalf("invalid stream: %s", atoms[0])
		}

		trigger(filters, atoms)
	}
}