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527 lines
15 KiB
Go
527 lines
15 KiB
Go
package gomime
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import (
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"bufio"
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"bytes"
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"io"
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"io/ioutil"
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"log"
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"mime"
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"mime/multipart"
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"net/http"
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"net/mail"
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"net/textproto"
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"regexp"
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"strings"
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)
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// VisitAcceptor decidest what to do with part which is processed
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// It is used by MIMEVisitor
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type VisitAcceptor interface {
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Accept(partReader io.Reader, header textproto.MIMEHeader, hasPlainSibling bool, isFirst, isLast bool) (err error)
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}
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func VisitAll(part io.Reader, h textproto.MIMEHeader, accepter VisitAcceptor) (err error) {
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mediaType, _, err := getContentType(h)
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if err != nil {
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return
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}
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return accepter.Accept(part, h, mediaType == "text/plain", true, true)
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}
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func IsLeaf(h textproto.MIMEHeader) bool {
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return !strings.HasPrefix(h.Get("Content-Type"), "multipart/")
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}
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// MIMEVisitor is main object to parse (visit) and process (accept) all parts of MIME message
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type MimeVisitor struct {
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target VisitAcceptor
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}
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// Accept reads part recursively if needed
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// hasPlainSibling is there when acceptor want to check alternatives
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func (mv *MimeVisitor) Accept(part io.Reader, h textproto.MIMEHeader, hasPlainSibling bool, isFirst, isLast bool) (err error) {
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if !isFirst {
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return
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}
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parentMediaType, params, err := getContentType(h)
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if err != nil {
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return
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}
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if err = mv.target.Accept(part, h, hasPlainSibling, true, false); err != nil {
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return
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}
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if !IsLeaf(h) {
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var multiparts []io.Reader
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var multipartHeaders []textproto.MIMEHeader
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if multiparts, multipartHeaders, err = GetMultipartParts(part, params); err != nil {
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return
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}
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hasPlainChild := false
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for _, header := range multipartHeaders {
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mediaType, _, _ := getContentType(header)
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if mediaType == "text/plain" {
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hasPlainChild = true
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}
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}
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if hasPlainSibling && parentMediaType == "multipart/related" {
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hasPlainChild = true
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}
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for i, p := range multiparts {
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if err = mv.Accept(p, multipartHeaders[i], hasPlainChild, true, true); err != nil {
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return
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}
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if err = mv.target.Accept(part, h, hasPlainSibling, false, i == (len(multiparts)-1)); err != nil {
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return
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}
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}
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}
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return
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}
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// NewMIMEVisitor initialiazed with acceptor
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func NewMimeVisitor(targetAccepter VisitAcceptor) *MimeVisitor {
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return &MimeVisitor{targetAccepter}
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}
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func GetRawMimePart(rawdata io.Reader, boundary string) (io.Reader, io.Reader) {
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b, _ := ioutil.ReadAll(rawdata)
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tee := bytes.NewReader(b)
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reader := bufio.NewReader(bytes.NewReader(b))
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byteBoundary := []byte(boundary)
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bodyBuffer := &bytes.Buffer{}
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for {
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line, _, err := reader.ReadLine()
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if err != nil {
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return tee, bytes.NewReader(bodyBuffer.Bytes())
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}
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if bytes.HasPrefix(line, byteBoundary) {
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break
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}
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}
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lineEndingLength := 0
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for {
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line, isPrefix, err := reader.ReadLine()
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if err != nil {
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return tee, bytes.NewReader(bodyBuffer.Bytes())
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}
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if bytes.HasPrefix(line, byteBoundary) {
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break
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}
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lineEndingLength = 0
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bodyBuffer.Write(line)
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if !isPrefix {
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reader.UnreadByte()
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reader.UnreadByte()
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token, _ := reader.ReadByte()
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if token == '\r' {
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lineEndingLength++
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bodyBuffer.WriteByte(token)
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}
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lineEndingLength++
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bodyBuffer.WriteByte(token)
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}
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}
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ioutil.ReadAll(reader)
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data := bodyBuffer.Bytes()
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return tee, bytes.NewReader(data[0 : len(data)-lineEndingLength])
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}
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func GetAllChildParts(part io.Reader, h textproto.MIMEHeader) (parts []io.Reader, headers []textproto.MIMEHeader, err error) {
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mediaType, params, err := getContentType(h)
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if err != nil {
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return
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}
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if strings.HasPrefix(mediaType, "multipart/") {
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var multiparts []io.Reader
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var multipartHeaders []textproto.MIMEHeader
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if multiparts, multipartHeaders, err = GetMultipartParts(part, params); err != nil {
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return
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}
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if strings.Contains(mediaType, "alternative") {
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var chosenPart io.Reader
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var chosenHeader textproto.MIMEHeader
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if chosenPart, chosenHeader, err = pickAlternativePart(multiparts, multipartHeaders); err != nil {
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return
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}
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var childParts []io.Reader
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var childHeaders []textproto.MIMEHeader
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if childParts, childHeaders, err = GetAllChildParts(chosenPart, chosenHeader); err != nil {
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return
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}
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parts = append(parts, childParts...)
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headers = append(headers, childHeaders...)
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} else {
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for i, p := range multiparts {
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var childParts []io.Reader
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var childHeaders []textproto.MIMEHeader
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if childParts, childHeaders, err = GetAllChildParts(p, multipartHeaders[i]); err != nil {
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return
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}
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parts = append(parts, childParts...)
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headers = append(headers, childHeaders...)
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}
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}
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} else {
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parts = append(parts, part)
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headers = append(headers, h)
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}
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return
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}
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func GetMultipartParts(r io.Reader, params map[string]string) (parts []io.Reader, headers []textproto.MIMEHeader, err error) {
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mr := multipart.NewReader(r, params["boundary"])
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parts = []io.Reader{}
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headers = []textproto.MIMEHeader{}
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var p *multipart.Part
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for {
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p, err = mr.NextRawPart()
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if err == io.EOF {
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err = nil
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break
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}
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if err != nil {
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return
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}
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b, _ := ioutil.ReadAll(p)
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buffer := bytes.NewBuffer(b)
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parts = append(parts, buffer)
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headers = append(headers, p.Header)
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}
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return
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}
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func pickAlternativePart(parts []io.Reader, headers []textproto.MIMEHeader) (part io.Reader, h textproto.MIMEHeader, err error) {
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for i, h := range headers {
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mediaType, _, err := getContentType(h)
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if err != nil {
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continue
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}
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if strings.HasPrefix(mediaType, "multipart/") {
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return parts[i], headers[i], nil
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}
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}
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for i, h := range headers {
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mediaType, _, err := getContentType(h)
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if err != nil {
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continue
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}
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if mediaType == "text/html" {
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return parts[i], headers[i], nil
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}
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}
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for i, h := range headers {
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mediaType, _, err := getContentType(h)
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if err != nil {
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continue
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}
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if mediaType == "text/plain" {
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return parts[i], headers[i], nil
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}
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}
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//if we get all the way here, part will be nil
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return
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}
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// Parse address comment as defined in http://tools.wordtothewise.com/rfc/822
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// FIXME: Does not work for address groups
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// NOTE: This should be removed for go>1.10 (please check)
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func parseAddressComment(raw string) string {
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parsed := []string{}
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for _, item := range regexp.MustCompile("[,;]").Split(raw, -1) {
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re := regexp.MustCompile("[(][^)]*[)]")
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comments := strings.Join(re.FindAllString(item, -1), " ")
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comments = strings.Replace(comments, "(", "", -1)
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comments = strings.Replace(comments, ")", "", -1)
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withoutComments := re.ReplaceAllString(item, "")
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addr, err := mail.ParseAddress(withoutComments)
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if err != nil {
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continue
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}
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if addr.Name == "" {
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addr.Name = comments
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}
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parsed = append(parsed, addr.String())
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}
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return strings.Join(parsed, ", ")
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}
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func checkHeaders(headers []textproto.MIMEHeader) bool {
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foundAttachment := false
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for i := 0; i < len(headers); i++ {
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h := headers[i]
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mediaType, _, _ := getContentType(h)
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if !strings.HasPrefix(mediaType, "text/") {
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foundAttachment = true
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} else if foundAttachment {
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//this means that there is a text part after the first attachment, so we will have to convert the body from plain->HTML
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return true
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}
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}
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return false
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}
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func decodePart(partReader io.Reader, header textproto.MIMEHeader) (decodedPart io.Reader) {
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decodedPart = DecodeContentEncoding(partReader, header.Get("Content-Transfer-Encoding"))
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if decodedPart == nil {
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log.Printf("Unsupported Content-Transfer-Encoding '%v'", header.Get("Content-Transfer-Encoding"))
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decodedPart = partReader
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}
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return
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}
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// assume 'text/plain' if missing
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func getContentType(header textproto.MIMEHeader) (mediatype string, params map[string]string, err error) {
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contentType := header.Get("Content-Type")
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if contentType == "" {
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contentType = "text/plain"
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}
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return mime.ParseMediaType(contentType)
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}
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// ===================== MIME Printer ===================================
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// Simply print resulting MIME tree into text form
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// TODO to file mime_printer.go
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type stack []string
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func (s stack) Push(v string) stack {
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return append(s, v)
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}
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func (s stack) Pop() (stack, string) {
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l := len(s)
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return s[:l-1], s[l-1]
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}
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func (s stack) Peek() string {
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return s[len(s)-1]
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}
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type MIMEPrinter struct {
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result *bytes.Buffer
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boundaryStack stack
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}
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func NewMIMEPrinter() (pd *MIMEPrinter) {
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return &MIMEPrinter{
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result: bytes.NewBuffer([]byte("")),
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boundaryStack: stack{},
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}
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}
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func (pd *MIMEPrinter) Accept(partReader io.Reader, header textproto.MIMEHeader, hasPlainSibling bool, isFirst, isLast bool) (err error) {
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if isFirst {
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http.Header(header).Write(pd.result)
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pd.result.Write([]byte("\n"))
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if IsLeaf(header) {
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pd.result.ReadFrom(partReader)
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} else {
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_, params, _ := getContentType(header)
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boundary := params["boundary"]
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pd.boundaryStack = pd.boundaryStack.Push(boundary)
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pd.result.Write([]byte("\nThis is a multi-part message in MIME format.\n--" + boundary + "\n"))
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}
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} else {
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if !isLast {
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pd.result.Write([]byte("\n--" + pd.boundaryStack.Peek() + "\n"))
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} else {
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var boundary string
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pd.boundaryStack, boundary = pd.boundaryStack.Pop()
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pd.result.Write([]byte("\n--" + boundary + "--\n.\n"))
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}
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}
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return nil
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}
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func (pd *MIMEPrinter) String() string {
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return pd.result.String()
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}
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// ======================== PlainText Collector =========================
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// Collect contents of all non-attachment text/plain parts and return
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// it is a string
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// TODO to file collector_plaintext.go
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type PlainTextCollector struct {
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target VisitAcceptor
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plainTextContents *bytes.Buffer
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}
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func NewPlainTextCollector(targetAccepter VisitAcceptor) *PlainTextCollector {
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return &PlainTextCollector{
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target: targetAccepter,
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plainTextContents: bytes.NewBuffer([]byte("")),
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}
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}
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func (ptc *PlainTextCollector) Accept(partReader io.Reader, header textproto.MIMEHeader, hasPlainSibling bool, isFirst, isLast bool) (err error) {
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if isFirst {
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if IsLeaf(header) {
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mediaType, params, _ := getContentType(header)
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disp, _, _ := mime.ParseMediaType(header.Get("Content-Disposition"))
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if mediaType == "text/plain" && disp != "attachment" {
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partData, _ := ioutil.ReadAll(partReader)
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decodedPart := decodePart(bytes.NewReader(partData), header)
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if buffer, err := ioutil.ReadAll(decodedPart); err == nil {
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buffer, err = DecodeCharset(buffer, mediaType, params)
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if err != nil {
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log.Println("Decode charset error:", err)
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err = nil // Don't fail parsing on decoding errors, use original
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}
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ptc.plainTextContents.Write(buffer)
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}
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err = ptc.target.Accept(bytes.NewReader(partData), header, hasPlainSibling, isFirst, isLast)
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return
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}
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}
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}
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err = ptc.target.Accept(partReader, header, hasPlainSibling, isFirst, isLast)
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return
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}
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func (ptc PlainTextCollector) GetPlainText() string {
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return ptc.plainTextContents.String()
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}
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// ======================== Body Collector ==============
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// Collect contents of all non-attachment parts and return
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// it as a string
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// TODO to file collector_body.go
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type BodyCollector struct {
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target VisitAcceptor
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htmlBodyBuffer *bytes.Buffer
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plainBodyBuffer *bytes.Buffer
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htmlHeaderBuffer *bytes.Buffer
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plainHeaderBuffer *bytes.Buffer
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hasHtml bool
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}
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func NewBodyCollector(targetAccepter VisitAcceptor) *BodyCollector {
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return &BodyCollector{
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target: targetAccepter,
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htmlBodyBuffer: bytes.NewBuffer([]byte("")),
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plainBodyBuffer: bytes.NewBuffer([]byte("")),
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htmlHeaderBuffer: bytes.NewBuffer([]byte("")),
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plainHeaderBuffer: bytes.NewBuffer([]byte("")),
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}
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}
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func (bc *BodyCollector) Accept(partReader io.Reader, header textproto.MIMEHeader, hasPlainSibling bool, isFirst, isLast bool) (err error) {
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// TODO: collect html and plaintext - if there's html with plain sibling don't include plain/text
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if isFirst {
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if IsLeaf(header) {
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mediaType, params, _ := getContentType(header)
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disp, _, _ := mime.ParseMediaType(header.Get("Content-Disposition"))
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if disp != "attachment" {
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partData, _ := ioutil.ReadAll(partReader)
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decodedPart := decodePart(bytes.NewReader(partData), header)
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if buffer, err := ioutil.ReadAll(decodedPart); err == nil {
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buffer, err = DecodeCharset(buffer, mediaType, params)
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if err != nil {
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log.Println("Decode charset error:", err)
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err = nil // Don't fail parsing on decoding errors, use original
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}
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if mediaType == "text/html" {
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bc.hasHtml = true
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http.Header(header).Write(bc.htmlHeaderBuffer)
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bc.htmlBodyBuffer.Write(buffer)
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} else if mediaType == "text/plain" {
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http.Header(header).Write(bc.plainHeaderBuffer)
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bc.plainBodyBuffer.Write(buffer)
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}
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}
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err = bc.target.Accept(bytes.NewReader(partData), header, hasPlainSibling, isFirst, isLast)
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return
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}
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}
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}
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err = bc.target.Accept(partReader, header, hasPlainSibling, isFirst, isLast)
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return
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}
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func (bc *BodyCollector) GetBody() (string, string) {
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if bc.hasHtml {
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return bc.htmlBodyBuffer.String(), "text/html"
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} else {
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return bc.plainBodyBuffer.String(), "text/plain"
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}
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}
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func (bc *BodyCollector) GetHeaders() string {
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if bc.hasHtml {
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return bc.htmlHeaderBuffer.String()
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} else {
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return bc.plainHeaderBuffer.String()
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}
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}
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// ======================== Attachments Collector ==============
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// Collect contents of all attachment parts and return
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// them as a string
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// TODO to file collector_attachment.go
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type AttachmentsCollector struct {
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target VisitAcceptor
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attBuffers []string
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attHeaders []string
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}
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func NewAttachmentsCollector(targetAccepter VisitAcceptor) *AttachmentsCollector {
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return &AttachmentsCollector{
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target: targetAccepter,
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attBuffers: []string{},
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attHeaders: []string{},
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}
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}
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func (ac *AttachmentsCollector) Accept(partReader io.Reader, header textproto.MIMEHeader, hasPlainSibling bool, isFirst, isLast bool) (err error) {
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if isFirst {
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if IsLeaf(header) {
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mediaType, params, _ := getContentType(header)
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disp, _, _ := mime.ParseMediaType(header.Get("Content-Disposition"))
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if (mediaType != "text/html" && mediaType != "text/plain") || disp == "attachment" {
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partData, _ := ioutil.ReadAll(partReader)
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decodedPart := decodePart(bytes.NewReader(partData), header)
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if buffer, err := ioutil.ReadAll(decodedPart); err == nil {
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buffer, err = DecodeCharset(buffer, mediaType, params)
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if err != nil {
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log.Println("Decode charset error:", err)
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err = nil // Don't fail parsing on decoding errors, use original
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}
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headerBuf := new(bytes.Buffer)
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http.Header(header).Write(headerBuf)
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ac.attHeaders = append(ac.attHeaders, headerBuf.String())
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ac.attBuffers = append(ac.attBuffers, string(buffer))
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}
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err = ac.target.Accept(bytes.NewReader(partData), header, hasPlainSibling, isFirst, isLast)
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return
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}
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}
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}
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err = ac.target.Accept(partReader, header, hasPlainSibling, isFirst, isLast)
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return
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}
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func (ac AttachmentsCollector) GetAttachments() []string {
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return ac.attBuffers
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}
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func (ac AttachmentsCollector) GetAttHeaders() []string {
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return ac.attHeaders
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}
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