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refactor: tidier encoding detection

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This commit is contained in:
James Houlahan
2020-08-17 17:09:34 +02:00
parent f4dfadce52
commit 6a7a77fc51
4 changed files with 35 additions and 42 deletions
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8
pkg/message/parser/parser_test.go
View File

@ -28,13 +28,13 @@ import (
) )
func newTestParser(t *testing.T, msg string) *Parser { func newTestParser(t *testing.T, msg string) *Parser {
p, err := New(f(msg)) p, err := New(getFileReader(msg))
require.NoError(t, err) require.NoError(t, err)
return p return p
} }
func f(filename string) io.ReadCloser { func getFileReader(filename string) io.ReadCloser {
f, err := os.Open(filepath.Join("testdata", filename)) f, err := os.Open(filepath.Join("testdata", filename))
if err != nil { if err != nil {
@ -44,8 +44,8 @@ func f(filename string) io.ReadCloser {
return f return f
} }
func s(filename string) string { func getFileAsString(filename string) string {
b, err := ioutil.ReadAll(f(filename)) b, err := ioutil.ReadAll(getFileReader(filename))
if err != nil { if err != nil {
panic(err) panic(err)
} }

27
pkg/message/parser/part.go
View File

@ -74,12 +74,7 @@ func (p *Part) ConvertToUTF8() error {
return err return err
} }
decoder := selectDecoderFromParams(params) decoder := selectSuitableDecoder(p, t, params)
if decoder == nil {
encoding, _, _ := charset.DetermineEncoding(p.Body, t)
decoder = encoding.NewDecoder()
}
if p.Body, err = decoder.Bytes(p.Body); err != nil { if p.Body, err = decoder.Bytes(p.Body); err != nil {
return err return err
@ -97,18 +92,16 @@ func (p *Part) ConvertToUTF8() error {
return nil return nil
} }
func selectDecoderFromParams(params map[string]string) *encoding.Decoder { func selectSuitableDecoder(p *Part, t string, params map[string]string) *encoding.Decoder {
charset, ok := params["charset"] if charset, ok := params["charset"]; ok {
if !ok { if decoder, err := pmmime.SelectDecoder(charset); err == nil {
return nil
}
decoder, err := pmmime.SelectDecoder(charset)
if err != nil {
return nil
}
return decoder return decoder
}
}
encoding, _, _ := charset.DetermineEncoding(p.Body, t)
return encoding.NewDecoder()
} }
func (p *Part) is7BitClean() bool { func (p *Part) is7BitClean() bool {

2
pkg/message/parser/writer_test.go
View File

@ -33,7 +33,7 @@ func TestParserWrite(t *testing.T) {
buf := new(bytes.Buffer) buf := new(bytes.Buffer)
assert.NoError(t, w.Write(buf)) assert.NoError(t, w.Write(buf))
assert.Equal(t, s("text_html_octet_attachment.eml"), crlf(buf.String())) assert.Equal(t, getFileAsString("text_html_octet_attachment.eml"), crlf(buf.String()))
} }
func crlf(s string) string { func crlf(s string) string {

44
pkg/message/parser_test.go
View File

@ -31,7 +31,7 @@ import (
) )
func TestParseTextPlain(t *testing.T) { func TestParseTextPlain(t *testing.T) {
f := f("text_plain.eml") f := getFileReader("text_plain.eml")
m, _, plainBody, attReaders, err := Parse(f, "", "") m, _, plainBody, attReaders, err := Parse(f, "", "")
require.NoError(t, err) require.NoError(t, err)
@ -46,7 +46,7 @@ func TestParseTextPlain(t *testing.T) {
} }
func TestParseTextPlainUTF8(t *testing.T) { func TestParseTextPlainUTF8(t *testing.T) {
f := f("text_plain_utf8.eml") f := getFileReader("text_plain_utf8.eml")
m, _, plainBody, attReaders, err := Parse(f, "", "") m, _, plainBody, attReaders, err := Parse(f, "", "")
require.NoError(t, err) require.NoError(t, err)
@ -61,7 +61,7 @@ func TestParseTextPlainUTF8(t *testing.T) {
} }
func TestParseTextPlainLatin1(t *testing.T) { func TestParseTextPlainLatin1(t *testing.T) {
f := f("text_plain_latin1.eml") f := getFileReader("text_plain_latin1.eml")
m, _, plainBody, attReaders, err := Parse(f, "", "") m, _, plainBody, attReaders, err := Parse(f, "", "")
require.NoError(t, err) require.NoError(t, err)
@ -76,7 +76,7 @@ func TestParseTextPlainLatin1(t *testing.T) {
} }
func TestParseTextPlainUnknownCharsetIsActuallyLatin1(t *testing.T) { func TestParseTextPlainUnknownCharsetIsActuallyLatin1(t *testing.T) {
f := f("text_plain_unknown_latin1.eml") f := getFileReader("text_plain_unknown_latin1.eml")
m, _, plainBody, attReaders, err := Parse(f, "", "") m, _, plainBody, attReaders, err := Parse(f, "", "")
require.NoError(t, err) require.NoError(t, err)
@ -91,7 +91,7 @@ func TestParseTextPlainUnknownCharsetIsActuallyLatin1(t *testing.T) {
} }
func TestParseTextPlainUnknownCharsetIsActuallyLatin2(t *testing.T) { func TestParseTextPlainUnknownCharsetIsActuallyLatin2(t *testing.T) {
f := f("text_plain_unknown_latin2.eml") f := getFileReader("text_plain_unknown_latin2.eml")
m, _, plainBody, attReaders, err := Parse(f, "", "") m, _, plainBody, attReaders, err := Parse(f, "", "")
require.NoError(t, err) require.NoError(t, err)
@ -112,7 +112,7 @@ func TestParseTextPlainUnknownCharsetIsActuallyLatin2(t *testing.T) {
} }
func TestParseTextPlainAlready7Bit(t *testing.T) { func TestParseTextPlainAlready7Bit(t *testing.T) {
f := f("text_plain_7bit.eml") f := getFileReader("text_plain_7bit.eml")
m, _, plainBody, attReaders, err := Parse(f, "", "") m, _, plainBody, attReaders, err := Parse(f, "", "")
require.NoError(t, err) require.NoError(t, err)
@ -127,7 +127,7 @@ func TestParseTextPlainAlready7Bit(t *testing.T) {
} }
func TestParseTextPlainWithOctetAttachment(t *testing.T) { func TestParseTextPlainWithOctetAttachment(t *testing.T) {
f := f("text_plain_octet_attachment.eml") f := getFileReader("text_plain_octet_attachment.eml")
m, _, plainBody, attReaders, err := Parse(f, "", "") m, _, plainBody, attReaders, err := Parse(f, "", "")
require.NoError(t, err) require.NoError(t, err)
@ -143,7 +143,7 @@ func TestParseTextPlainWithOctetAttachment(t *testing.T) {
} }
func TestParseTextPlainWithOctetAttachmentGoodFilename(t *testing.T) { func TestParseTextPlainWithOctetAttachmentGoodFilename(t *testing.T) {
f := f("text_plain_octet_attachment_good_2231_filename.eml") f := getFileReader("text_plain_octet_attachment_good_2231_filename.eml")
m, _, plainBody, attReaders, err := Parse(f, "", "") m, _, plainBody, attReaders, err := Parse(f, "", "")
require.NoError(t, err) require.NoError(t, err)
@ -160,7 +160,7 @@ func TestParseTextPlainWithOctetAttachmentGoodFilename(t *testing.T) {
} }
func TestParseTextPlainWithOctetAttachmentBadFilename(t *testing.T) { func TestParseTextPlainWithOctetAttachmentBadFilename(t *testing.T) {
f := f("text_plain_octet_attachment_bad_2231_filename.eml") f := getFileReader("text_plain_octet_attachment_bad_2231_filename.eml")
m, _, plainBody, attReaders, err := Parse(f, "", "") m, _, plainBody, attReaders, err := Parse(f, "", "")
require.NoError(t, err) require.NoError(t, err)
@ -177,7 +177,7 @@ func TestParseTextPlainWithOctetAttachmentBadFilename(t *testing.T) {
} }
func TestParseTextPlainWithPlainAttachment(t *testing.T) { func TestParseTextPlainWithPlainAttachment(t *testing.T) {
f := f("text_plain_plain_attachment.eml") f := getFileReader("text_plain_plain_attachment.eml")
m, _, plainBody, attReaders, err := Parse(f, "", "") m, _, plainBody, attReaders, err := Parse(f, "", "")
require.NoError(t, err) require.NoError(t, err)
@ -193,7 +193,7 @@ func TestParseTextPlainWithPlainAttachment(t *testing.T) {
} }
func TestParseTextPlainWithImageInline(t *testing.T) { func TestParseTextPlainWithImageInline(t *testing.T) {
f := f("text_plain_image_inline.eml") f := getFileReader("text_plain_image_inline.eml")
m, _, plainBody, attReaders, err := Parse(f, "", "") m, _, plainBody, attReaders, err := Parse(f, "", "")
require.NoError(t, err) require.NoError(t, err)
@ -213,7 +213,7 @@ func TestParseTextPlainWithImageInline(t *testing.T) {
} }
func TestParseWithMultipleTextParts(t *testing.T) { func TestParseWithMultipleTextParts(t *testing.T) {
f := f("multiple_text_parts.eml") f := getFileReader("multiple_text_parts.eml")
m, _, plainBody, attReaders, err := Parse(f, "", "") m, _, plainBody, attReaders, err := Parse(f, "", "")
require.NoError(t, err) require.NoError(t, err)
@ -228,7 +228,7 @@ func TestParseWithMultipleTextParts(t *testing.T) {
} }
func TestParseTextHTML(t *testing.T) { func TestParseTextHTML(t *testing.T) {
f := f("text_html.eml") f := getFileReader("text_html.eml")
m, _, plainBody, attReaders, err := Parse(f, "", "") m, _, plainBody, attReaders, err := Parse(f, "", "")
require.NoError(t, err) require.NoError(t, err)
@ -243,7 +243,7 @@ func TestParseTextHTML(t *testing.T) {
} }
func TestParseTextHTMLAlready7Bit(t *testing.T) { func TestParseTextHTMLAlready7Bit(t *testing.T) {
f := f("text_html_7bit.eml") f := getFileReader("text_html_7bit.eml")
m, _, plainBody, attReaders, err := Parse(f, "", "") m, _, plainBody, attReaders, err := Parse(f, "", "")
assert.NoError(t, err) assert.NoError(t, err)
@ -258,7 +258,7 @@ func TestParseTextHTMLAlready7Bit(t *testing.T) {
} }
func TestParseTextHTMLWithOctetAttachment(t *testing.T) { func TestParseTextHTMLWithOctetAttachment(t *testing.T) {
f := f("text_html_octet_attachment.eml") f := getFileReader("text_html_octet_attachment.eml")
m, _, plainBody, attReaders, err := Parse(f, "", "") m, _, plainBody, attReaders, err := Parse(f, "", "")
require.NoError(t, err) require.NoError(t, err)
@ -274,7 +274,7 @@ func TestParseTextHTMLWithOctetAttachment(t *testing.T) {
} }
func TestParseTextHTMLWithPlainAttachment(t *testing.T) { func TestParseTextHTMLWithPlainAttachment(t *testing.T) {
f := f("text_html_plain_attachment.eml") f := getFileReader("text_html_plain_attachment.eml")
m, _, plainBody, attReaders, err := Parse(f, "", "") m, _, plainBody, attReaders, err := Parse(f, "", "")
require.NoError(t, err) require.NoError(t, err)
@ -291,7 +291,7 @@ func TestParseTextHTMLWithPlainAttachment(t *testing.T) {
} }
func TestParseTextHTMLWithImageInline(t *testing.T) { func TestParseTextHTMLWithImageInline(t *testing.T) {
f := f("text_html_image_inline.eml") f := getFileReader("text_html_image_inline.eml")
m, _, plainBody, attReaders, err := Parse(f, "", "") m, _, plainBody, attReaders, err := Parse(f, "", "")
assert.NoError(t, err) assert.NoError(t, err)
@ -311,7 +311,7 @@ func TestParseTextHTMLWithImageInline(t *testing.T) {
} }
func TestParseWithAttachedPublicKey(t *testing.T) { func TestParseWithAttachedPublicKey(t *testing.T) {
f := f("text_plain.eml") f := getFileReader("text_plain.eml")
m, _, plainBody, attReaders, err := Parse(f, "publickey", "publickeyname") m, _, plainBody, attReaders, err := Parse(f, "publickey", "publickeyname")
require.NoError(t, err) require.NoError(t, err)
@ -326,7 +326,7 @@ func TestParseWithAttachedPublicKey(t *testing.T) {
} }
func TestParseTextHTMLWithEmbeddedForeignEncoding(t *testing.T) { func TestParseTextHTMLWithEmbeddedForeignEncoding(t *testing.T) {
f := f("text_html_embedded_foreign_encoding.eml") f := getFileReader("text_html_embedded_foreign_encoding.eml")
m, _, plainBody, attReaders, err := Parse(f, "", "") m, _, plainBody, attReaders, err := Parse(f, "", "")
require.NoError(t, err) require.NoError(t, err)
@ -342,7 +342,7 @@ func TestParseTextHTMLWithEmbeddedForeignEncoding(t *testing.T) {
} }
func TestParseMultipartAlternative(t *testing.T) { func TestParseMultipartAlternative(t *testing.T) {
f := f("multipart_alternative.eml") f := getFileReader("multipart_alternative.eml")
m, _, plainBody, _, err := Parse(f, "", "") m, _, plainBody, _, err := Parse(f, "", "")
require.NoError(t, err) require.NoError(t, err)
@ -364,7 +364,7 @@ func TestParseMultipartAlternative(t *testing.T) {
} }
func TestParseMultipartAlternativeNested(t *testing.T) { func TestParseMultipartAlternativeNested(t *testing.T) {
f := f("multipart_alternative_nested.eml") f := getFileReader("multipart_alternative_nested.eml")
m, _, plainBody, _, err := Parse(f, "", "") m, _, plainBody, _, err := Parse(f, "", "")
require.NoError(t, err) require.NoError(t, err)
@ -385,7 +385,7 @@ func TestParseMultipartAlternativeNested(t *testing.T) {
assert.Equal(t, "*multipart 2.1*\n\n", plainBody) assert.Equal(t, "*multipart 2.1*\n\n", plainBody)
} }
func f(filename string) io.Reader { func getFileReader(filename string) io.Reader {
f, err := os.Open(filepath.Join("testdata", filename)) f, err := os.Open(filepath.Join("testdata", filename))
if err != nil { if err != nil {
panic(err) panic(err)