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Add EML parsing with new tests and examples

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Introduce new EML files with valid and invalid examples. Implement tests for EML parsing from readers and files, checking for both successful parsing and expected failures on invalid inputs.
This commit is contained in:
Winni Neessen 2024-10-24 13:36:03 +02:00
parent 127cfdf2bc
commit 887e3cd768
Signed by: wneessen
GPG key ID: 385AC9889632126E
5 changed files with 135 additions and 23 deletions
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136
eml_test.go
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@ -6,11 +6,8 @@ package mail
import (
"bytes"
"fmt"
"os"
"strings"
"testing"
"time"
)
const (
@ -22,6 +19,14 @@ Subject: Saying Hello
Date: Fri, 21 Nov 1997 09:55:06 -0600
Message-ID: <1234@local.machine.example>
This is a message just to say hello.
So, "Hello".`
exampleMailRFC5322A11InvalidFrom = `From: §§§§§§§§§
To: Mary Smith <mary@example.net>
Subject: Saying Hello
Date: Fri, 21 Nov 1997 09:55:06 -0600
Message-ID: <1234@local.machine.example>
This is a message just to say hello.
So, "Hello".`
exampleMailPlainNoEnc = `Date: Wed, 01 Nov 2023 00:00:00 +0000
@ -614,6 +619,108 @@ VGhpcyBpcyBhIHRlc3QgaW4gQmFzZTY0
--------------26A45336F6C6196BD8BBA2A2--`
)
func TestEMLToMsgFromReader(t *testing.T) {
t.Run("EMLToMsgFromReader via EMLToMsgFromString, check subject and encoding", func(t *testing.T) {
tests := []struct {
name string
emlString string
wantEncoding Encoding
wantSubject string
}{
{
"RFC5322 A1.1 example mail", exampleMailRFC5322A11, EncodingUSASCII,
"Saying Hello"},
{
"Plain text no encoding (7bit)", exampleMailPlain7Bit, EncodingUSASCII,
"Example mail // plain text without encoding",
},
{
"Plain text no encoding", exampleMailPlainNoEnc, NoEncoding,
"Example mail // plain text without encoding",
},
{
"Plain text quoted-printable", exampleMailPlainQP, EncodingQP,
"Example mail // plain text quoted-printable",
},
{
"Plain text base64", exampleMailPlainB64, EncodingB64,
"Example mail // plain text base64",
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
parsed, err := EMLToMsgFromString(tt.emlString)
if err != nil {
t.Fatalf("failed to parse EML string: %s", err)
}
if parsed.Encoding() != tt.wantEncoding.String() {
t.Errorf("failed to parse EML string: want encoding %s, got %s", tt.wantEncoding,
parsed.Encoding())
}
gotSubject, ok := parsed.genHeader[HeaderSubject]
if !ok {
t.Fatalf("failed to parse EML string. No subject header found")
}
if len(gotSubject) != 1 {
t.Fatalf("failed to parse EML string, more than one subject header found")
}
if !strings.EqualFold(gotSubject[0], tt.wantSubject) {
t.Errorf("failed to parse EML string: want subject %s, got %s", tt.wantSubject,
gotSubject[0])
}
})
}
})
t.Run("EMLToMsgFromReader fails on reader", func(t *testing.T) {
emlReader := bytes.NewBufferString("invalid")
if _, err := EMLToMsgFromReader(emlReader); err == nil {
t.Errorf("EML parsing with invalid EML string should fail")
}
})
t.Run("EMLToMsgFromReader fails on parseEML", func(t *testing.T) {
emlReader := bytes.NewBufferString(exampleMailRFC5322A11InvalidFrom)
if _, err := EMLToMsgFromReader(emlReader); err == nil {
t.Errorf("EML parsing with invalid EML string should fail")
}
})
}
func TestEMLToMsgFromFile(t *testing.T) {
t.Run("EMLToMsgFromFile succeeds", func(t *testing.T) {
parsed, err := EMLToMsgFromFile("testdata/RFC5322-A1-1.eml")
if err != nil {
t.Fatalf("EMLToMsgFromFile failed: %s ", err)
}
if parsed.Encoding() != EncodingUSASCII.String() {
t.Errorf("EMLToMsgFromFile failed: want encoding %s, got %s", EncodingUSASCII,
parsed.Encoding())
}
gotSubject, ok := parsed.genHeader[HeaderSubject]
if !ok {
t.Fatalf("failed to parse EML string. No subject header found")
}
if len(gotSubject) != 1 {
t.Fatalf("failed to parse EML string, more than one subject header found")
}
if !strings.EqualFold(gotSubject[0], "Saying Hello") {
t.Errorf("failed to parse EML string: want subject %s, got %s", "Saying Hello",
gotSubject[0])
}
})
t.Run("EMLToMsgFromFile fails on file not found", func(t *testing.T) {
if _, err := EMLToMsgFromFile("testdata/not-existing.eml"); err == nil {
t.Errorf("EMLToMsgFromFile with invalid file should fail")
}
})
t.Run("EMLToMsgFromFile fails on parseEML", func(t *testing.T) {
if _, err := EMLToMsgFromFile("testdata/RFC5322-A1-1-invalid-from.eml"); err == nil {
t.Errorf("EMLToMsgFromFile with invalid EML message should fail")
}
})
}
/*
func TestEMLToMsgFromString(t *testing.T) {
tests := []struct {
name string
@ -621,26 +728,6 @@ func TestEMLToMsgFromString(t *testing.T) {
enc string
sub string
}{
{
"RFC5322 A1.1", exampleMailRFC5322A11, "7bit",
"Saying Hello",
},
{
"Plain text no encoding (7bit)", exampleMailPlain7Bit, "7bit",
"Example mail // plain text without encoding",
},
{
"Plain text no encoding", exampleMailPlainNoEnc, "8bit",
"Example mail // plain text without encoding",
},
{
"Plain text quoted-printable", exampleMailPlainQP, "quoted-printable",
"Example mail // plain text quoted-printable",
},
{
"Plain text base64", exampleMailPlainB64, "base64",
"Example mail // plain text base64",
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
@ -1009,3 +1096,6 @@ func stringToTempFile(data, name string) (string, string, error) {
}
return tempDir, filePath, nil
}
*/

8
testdata/RFC5322-A1-1-invalid-from.eml vendored Normal file
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@ -0,0 +1,8 @@
From: §§§§§§§§
To: Mary Smith <mary@example.net>
Subject: Saying Hello
Date: Fri, 21 Nov 1997 09:55:06 -0600
Message-ID: <1234@local.machine.example>
This is a message just to say hello.
So, "Hello".

3
testdata/RFC5322-A1-1-invalid-from.eml.license vendored Normal file
View file

@ -0,0 +1,3 @@
// SPDX-FileCopyrightText: Copyright (c) 2022-2024 The go-mail Authors
//
// SPDX-License-Identifier: MIT

8
testdata/RFC5322-A1-1.eml vendored Normal file
View file

@ -0,0 +1,8 @@
From: John Doe <jdoe@machine.example>
To: Mary Smith <mary@example.net>
Subject: Saying Hello
Date: Fri, 21 Nov 1997 09:55:06 -0600
Message-ID: <1234@local.machine.example>
This is a message just to say hello.
So, "Hello".

3
testdata/RFC5322-A1-1.eml.license vendored Normal file
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@ -0,0 +1,3 @@
// SPDX-FileCopyrightText: Copyright (c) 2022-2024 The go-mail Authors
//
// SPDX-License-Identifier: MIT