mirror of https://github.com/carlostrub/sisyphus
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225 lines
5.0 KiB
Go
225 lines
5.0 KiB
Go
package main
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import (
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"bufio"
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"errors"
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"math"
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"mime/quotedprintable"
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"regexp"
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"strings"
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"github.com/kennygrant/sanitize"
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"github.com/luksen/maildir"
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)
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// Mail includes the key of a mail in Maildir
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type Mail struct {
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Key string
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Subject, Body *string
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Junk bool
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}
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// Index loads all mail keys from the Maildir directory for processing.
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func Index(d string, junk bool) (m []*Mail, err error) {
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var j []string
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if junk {
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j, err = maildir.Dir(d + "/.Junk").Keys()
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} else {
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j, err = maildir.Dir(d).Keys()
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}
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if err != nil {
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return m, err
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}
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for _, val := range j {
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var new Mail
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new.Key = val
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new.Junk = junk
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m = append(m, &new)
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}
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return m, nil
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}
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func trimStringFromBase64(s string) string {
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if idx := strings.Index(s, "Content-Transfer-Encoding: base64"); idx != -1 {
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return s[:idx-1]
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}
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return s
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}
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func cleanString(i string) (s string, err error) {
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s = trimStringFromBase64(i)
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s = sanitize.Accents(s)
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s = sanitize.HTML(s)
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s = strings.ToLower(s)
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s = strings.Replace(s, "boundary=", " ", -1)
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s = strings.Replace(s, "charset", " ", -1)
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s = strings.Replace(s, "content-transfer-encoding", " ", -1)
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s = strings.Replace(s, "content-type", " ", -1)
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s = strings.Replace(s, "image/jpeg", " ", -1)
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s = strings.Replace(s, "multipart/alternative", " ", -1)
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s = strings.Replace(s, "multipart/related", " ", -1)
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s = strings.Replace(s, "name=", " ", -1)
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s = strings.Replace(s, "nextpart", " ", -1)
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s = strings.Replace(s, "quoted-printable", " ", -1)
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s = strings.Replace(s, "text/html", " ", -1)
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s = strings.Replace(s, "text/plain", " ", -1)
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s = strings.Replace(s, "this email must be viewed in html mode", " ", -1)
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s = strings.Replace(s, "this is a multi-part message in mime format", " ", -1)
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s = strings.Replace(s, "windows-1251", " ", -1)
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s = strings.Replace(s, "windows-1252", " ", -1)
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s = strings.Replace(s, "!", " ", -1)
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s = strings.Replace(s, "#", " ", -1)
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s = strings.Replace(s, "$", " ", -1)
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s = strings.Replace(s, "%", " ", -1)
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s = strings.Replace(s, "&", " ", -1)
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s = strings.Replace(s, "'", "", -1)
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s = strings.Replace(s, "(", " ", -1)
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s = strings.Replace(s, ")", " ", -1)
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s = strings.Replace(s, "*", " ", -1)
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s = strings.Replace(s, "+", " ", -1)
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s = strings.Replace(s, ",", " ", -1)
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s = strings.Replace(s, ". ", " ", -1)
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s = strings.Replace(s, "<", " ", -1)
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s = strings.Replace(s, "=", " ", -1)
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s = strings.Replace(s, ">", " ", -1)
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s = strings.Replace(s, "?", " ", -1)
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s = strings.Replace(s, "@", " ", -1)
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s = strings.Replace(s, "[", " ", -1)
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s = strings.Replace(s, "\"", " ", -1)
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s = strings.Replace(s, "\\", " ", -1)
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s = strings.Replace(s, "\n", " ", -1)
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s = strings.Replace(s, "\t", " ", -1)
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s = strings.Replace(s, "]", " ", -1)
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s = strings.Replace(s, "^", " ", -1)
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s = strings.Replace(s, "_", " ", -1)
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s = strings.Replace(s, "{", " ", -1)
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s = strings.Replace(s, "|", " ", -1)
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s = strings.Replace(s, "}", " ", -1)
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for i := 0; i < 10; i++ {
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s = strings.Replace(s, " ", " ", -1)
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}
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return s, nil
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}
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// wordlist takes a string of space separated text and returns a list of unique
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// words in a space separated string
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func wordlist(s string) (l []string, err error) {
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list := make(map[string]int)
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raw := strings.Split(s, " ")
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var clean []string
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for _, w := range raw {
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// no long or too short words
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length := len(w)
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if length < 4 || length > 10 {
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continue
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}
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// no numbers, special characters, etc. -- only words
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match, _ := regexp.MatchString("(^[a-z]+$)", w)
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if !match {
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continue
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} else {
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clean = append(clean, w)
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}
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}
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// only the first 200 words count
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maxWords := int(math.Min(200, float64(len(clean))))
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for i := 0; i < maxWords; i++ {
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w := clean[i]
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list[w]++
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}
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for word, count := range list {
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if count > 10 {
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continue
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}
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l = append(l, word)
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}
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return l, nil
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}
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// Clean cleans the mail's subject and body
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func (m *Mail) Clean() error {
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if m.Subject != nil {
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s, err := cleanString(*m.Subject)
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if err != nil {
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return err
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}
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m.Subject = &s
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}
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if m.Body != nil {
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b, err := cleanString(*m.Body)
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if err != nil {
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return err
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}
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m.Body = &b
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}
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return nil
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}
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// Wordlists prepares the mail's subject and body for training
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func (m *Mail) Wordlists() (subject, body []string, err error) {
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if m.Subject != nil {
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subject, err = wordlist(*m.Subject)
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if err != nil {
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return subject, body, err
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}
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}
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if m.Body != nil {
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body, err = wordlist(*m.Body)
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if err != nil {
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return subject, body, err
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}
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}
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return subject, body, nil
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}
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// Load reads a mail's subject and body
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func (m *Mail) Load(d string) error {
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message, err := maildir.Dir(d).Message(m.Key)
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if err != nil {
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return err
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}
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// get Subject
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if m.Subject != nil {
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return errors.New("there is already a subject")
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}
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subject := message.Header.Get("Subject")
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m.Subject = &subject
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// get Body
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bQ := quotedprintable.NewReader(message.Body)
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var b []string
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bScanner := bufio.NewScanner(bQ)
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for bScanner.Scan() {
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raw := bScanner.Text()
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b = append(b, raw)
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}
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body := strings.Join(b, " ")
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if m.Body != nil {
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return errors.New("there is already a body")
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}
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m.Body = &body
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return nil
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}
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