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|
package cmd
import (
"bufio"
"fmt"
"io"
"net/mail"
"sort"
"strings"
"github.com/jhillyerd/enmime"
)
// AddressHeaders enumerates SMTP headers that contain email addresses
var addressHeaders = []string{"From", "To", "Delivered-To", "Cc", "Bcc", "Reply-To"}
// markdown adds some simple HTML tag like methods to a bufio.Writer
type markdown struct {
*bufio.Writer
}
func (md *markdown) H1(content string) {
bar := strings.Repeat("=", len(content))
fmt.Fprintf(md, "%v\n%v\n\n", content, bar)
}
func (md *markdown) H2(content string) {
fmt.Fprintf(md, "## %v\n", content)
}
func (md *markdown) H3(content string) {
fmt.Fprintf(md, "### %v\n", content)
}
// Printf implements fmt.Printf for markdown
func (md *markdown) Printf(format string, args ...interface{}) {
fmt.Fprintf(md, format, args...)
}
// Println implements fmt.Println for markdown
func (md *markdown) Println(args ...interface{}) {
fmt.Fprintln(md, args...)
}
// EnvelopeToMarkdown renders the contents of an enmime.Envelope in Markdown format. Used by
// mime-dump and mime-extractor commands.
func EnvelopeToMarkdown(w io.Writer, e *enmime.Envelope, name string) error {
md := &markdown{bufio.NewWriter(w)}
md.H1(name)
// Output a sorted list of headers, minus the ones displayed later
md.H2("Header")
if e.Root != nil && e.Root.Header != nil {
keys := make([]string, 0, len(e.Root.Header))
for k := range e.Root.Header {
switch strings.ToLower(k) {
case "from", "to", "cc", "bcc", "reply-to", "subject":
continue
}
keys = append(keys, k)
}
sort.Strings(keys)
for _, k := range keys {
md.Printf(" %v: %v\n", k, e.GetHeader(k))
}
}
md.Println()
md.H2("Envelope")
for _, hkey := range addressHeaders {
addrlist, err := e.AddressList(hkey)
if err != nil {
if err == mail.ErrHeaderNotPresent {
continue
}
return err
}
md.H3(hkey)
for _, addr := range addrlist {
md.Printf("- %v `<%v>`\n", addr.Name, addr.Address)
}
md.Println()
}
md.H3("Subject")
md.Println(e.GetHeader("Subject"))
md.Println()
md.H2("Body Text")
md.Println(e.Text)
md.Println()
md.H2("Body HTML")
md.Println(e.HTML)
md.Println()
md.H2("Attachment List")
for _, a := range e.Attachments {
md.Printf("- %v (%v)\n", a.FileName, a.ContentType)
if a.ContentID != "" {
md.Printf(" Content-ID: %s\n", a.ContentID)
}
}
md.Println()
md.H2("Inline List")
for _, a := range e.Inlines {
md.Printf("- %v (%v)\n", a.FileName, a.ContentType)
if a.ContentID != "" {
md.Printf(" Content-ID: %s\n", a.ContentID)
}
}
md.Println()
md.H2("Other Part List")
for _, a := range e.OtherParts {
md.Printf("- %v (%v)\n", a.FileName, a.ContentType)
if a.ContentID != "" {
md.Printf(" Content-ID: %s\n", a.ContentID)
}
}
md.Println()
md.H2("MIME Part Tree")
if e.Root == nil {
md.Println("Message was not MIME encoded")
} else {
FormatPart(md, e.Root, " ")
}
if len(e.Errors) > 0 {
md.Println()
md.H2("Errors")
for _, perr := range e.Errors {
md.Println("-", perr)
}
}
return md.Flush()
}
// FormatPart pretty prints the Part tree
func FormatPart(w io.Writer, p *enmime.Part, indent string) {
if p == nil {
return
}
sibling := p.NextSibling
child := p.FirstChild
// Compute indent strings
myindent := indent + "`-- "
childindent := indent + " "
if sibling != nil {
myindent = indent + "|-- "
childindent = indent + "| "
}
if p.Parent == nil {
// Root shouldn't be decorated, has no siblings
myindent = indent
childindent = indent
}
// Format and print this node
ctype := "MISSING TYPE"
if p.ContentType != "" {
ctype = p.ContentType
}
disposition := ""
if p.Disposition != "" {
disposition = fmt.Sprintf(", disposition: %s", p.Disposition)
}
filename := ""
if p.FileName != "" {
filename = fmt.Sprintf(", filename: %q", p.FileName)
}
errors := ""
if len(p.Errors) > 0 {
errors = fmt.Sprintf(" (errors: %v)", len(p.Errors))
}
fmt.Fprintf(w, "%s%s%s%s%s\n", myindent, ctype, disposition, filename, errors)
// Recurse
FormatPart(w, child, childindent)
FormatPart(w, sibling, indent)
}
|
