jhillyerd / enmime

MIME mail encoding and decoding package for Go

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Missing Boundary: Boundary was not closed correctly

nickzelei opened this issue · comments

What I did:
Attempted to read in an email attachment

What I expected:
Have it read out all of the attachments

What I got:
An error stating that the boundary is unbounded/incorrect

[[W] Missing Boundary: Boundary "dummytestboundary" was not closed correctly]

Release or branch I am using:
master

I've attempted reading in a few mime emails but have received the same error for both.
I also tried running the mime-extractor.go cmd but met the same issue and no output.

Sample code

package main

import (
	"bufio"
	"fmt"
	"os"

	"github.com/jhillyerd/enmime"
)

func main() {
	scanner := bufio.NewReader(os.Stdin)
	part, err := enmime.ReadParts(scanner)

	if err != nil {
		fmt.Println(err)
		return
	}

	fmt.Println("Boundary", part.Boundary)

	if len(part.Errors) > 0 {
		fmt.Println("Errors:", part.Errors)
		return
	}

	fmt.Println(part)
}

Output:

cat dummy.email.txt | ./mailparser
Boundary dummytestboundary
Errors: [[W] Missing Boundary: Boundary "dummytestboundary" was not closed correctly]

Sample input:

MIME-Version: 1.0
Content-Type: multipart/related;boundary=dummytestboundary

--dummytestboundary
Content-Type: text/xml;charset="UTF-8"
Content-ID: ACORD

<ACORD></ACORD>

--dummytestboundary
Content-Type: application/pdf
Content-ID: dummy.pdf
Content-Description: This is the base64 encoded dummy.pdf

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--dummytestboundary

mime-extractor.go output

dummy.email.txt
===============

## Header
    Content-Type: multipart/related;boundary="dummytestboundary"
    Mime-Version: 1.0

## Envelope
### Subject


## Body Text


## Body HTML


## Attachment List

## Inline List

## Other Part List
-  (text/xml)
  Content-ID: ACORD
-  (application/pdf)
  Content-ID: dummy.pdf
-  (application/pdf)
  Content-ID: dummy.pdf

## MIME Part Tree
    multipart/related (errors: 1)
    |-- text/xml
    |-- application/pdf
    `-- application/pdf

## Errors
- [W] Missing Boundary: Boundary "dummytestboundary" was not closed correctly

Extracting attachments into /.../mailparser... Done!

I have this working in a nodejs program but was trying it out in go for fun/perf differences, but have been failing to see why there is an issue. It appears boundary.go may not be reading the final boundary, it hits EOF and then marks it as an unbounded file.

This is expected, ending boundaries should have a trailing --: --simple boundary--

Oh I see. Ok I added an ending boundary (for testing) - it passed! Cool.
Unfortunately the files I'm parsing are out of my control and don't properly set the ending boundary ☹️

I'll close this though since it's technically by design. Would be nice to consider that exception though in the event where EOF has been reached and ends with the final boundary (even if not ending). Perhaps that is a usecase though better served outside of this project.

Thank you!

It's only a warning. You will find a lot of malformed MIME out there in the wild, so we try to note it and move on.

Oh fair, hadn't considered that. Just figured if error then stop. I'm new to golang so still trying to figure things out!