feat: add flag smime for indicating that the part should be marked for singing with S/MIME

encoding.go

@@ -19,9 +19,6 @@ type MIMEVersion string
 // MIMEType represents the MIME type for the mail
 type MIMEType string
 
-// Disposition represents a content disposition for the Msg
-type Disposition string
-
 // List of supported encodings
 const (
 	// EncodingB64 represents the Base64 encoding as specified in RFC 2045.
@@ -163,11 +160,6 @@ const (
 	MIMESMime       MIMEType = `signed; protocol="application/pkcs7-signature"; micalg=sha256`
 )
 
-// List of common content disposition
-const (
-	DispositionSMime Disposition = `attachment; filename="smime.p7s"`
-)
-
 // String is a standard method to convert an Charset into a printable format
 func (c Charset) String() string {
 	return string(c)
@@ -182,8 +174,3 @@ func (c ContentType) String() string {
 func (e Encoding) String() string {
 	return string(e)
 }
-
-// String is a standard method to convert an Disposition into a printable format
-func (d Disposition) String() string {
-	return string(d)
-}

encoding_test.go

@@ -126,22 +126,3 @@ func TestCharset_String(t *testing.T) {
 		})
 	}
 }
-
-// TestDisposition_String tests the string method of the Disposition object
-func TestDisposition_String(t *testing.T) {
-	tests := []struct {
-		name string
-		d    Disposition
-		want string
-	}{
-		{"Disposition: S/Mime", DispositionSMime, `attachment; filename="smime.p7s"`},
-	}
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			if tt.d.String() != tt.want {
-				t.Errorf("wrong string for Disposition returned. Expected: %s, got: %s",
-					tt.want, tt.d.String())
-			}
-		})
-	}
-}

msgwriter.go

@@ -269,9 +269,6 @@ func (mw *msgWriter) writePart(part *Part, charset Charset) {
 		if part.description != "" {
 			mimeHeader.Add(string(HeaderContentDescription), part.description)
 		}
-		if part.disposition != "" {
-			mimeHeader.Add(string(HeaderContentDisposition), part.disposition.String())
-		}
 		mimeHeader.Add(string(HeaderContentType), contentType)
 		mimeHeader.Add(string(HeaderContentTransferEnc), contentTransferEnc)
 		mw.newPart(mimeHeader)

part.go

@@ -17,10 +17,10 @@ type Part struct {
 	contentType ContentType
 	charset     Charset
 	description string
-	disposition Disposition
 	encoding    Encoding
 	isDeleted   bool
 	writeFunc   func(io.Writer) (int64, error)
+	smime       bool
 }
 
 // GetContent executes the WriteFunc of the Part and returns the content as byte slice
@@ -57,9 +57,9 @@ func (p *Part) GetDescription() string {
 	return p.description
 }
 
-// GetDisposition returns the currently set Content-Disposition of the Part
+// IsSMimeSigned returns true if the Part should be singed with S/MIME
-func (p *Part) GetDisposition() Disposition {
+func (p *Part) IsSMimeSigned() bool {
-	return p.disposition
+	return p.smime
 }
 
 // SetContent overrides the content of the Part with the given string
@@ -88,9 +88,9 @@ func (p *Part) SetDescription(description string) {
 	p.description = description
 }
 
-// SetDisposition overrides the Content-Disposition of the Part
+// SetIsSMimeSigned sets the flag for signing the Part with S/MIME
-func (p *Part) SetDisposition(disposition Disposition) {
+func (p *Part) SetIsSMimeSigned(smime bool) {
-	p.disposition = disposition
+	p.smime = smime
 }
 
 // SetWriteFunc overrides the WriteFunc of the Part
@@ -125,9 +125,9 @@ func WithPartContentDescription(description string) PartOption {
 	}
 }
 
-// WithContentDisposition overrides the default Part Content-Disposition
+// WithSMimeSinging overrides the flag for signing the Part with S/MIME
-func WithContentDisposition(disposition Disposition) PartOption {
+func WithSMimeSinging() PartOption {
 	return func(p *Part) {
-		p.disposition = disposition
+		p.smime = true
 	}
 }

part_test.go

@@ -102,32 +102,21 @@ func TestPart_WithPartContentDescription(t *testing.T) {
 	}
 }
 
-// TestPart_withContentDisposition tests the WithContentDisposition method
+// TestPart_WithSMimeSinging tests the WithSMimeSinging method
-func TestPart_withContentDisposition(t *testing.T) {
+func TestPart_WithSMimeSinging(t *testing.T) {
-	tests := []struct {
-		name        string
-		disposition Disposition
-	}{
-		{"Part disposition: test", "test"},
-		{"Part disposition: empty", ""},
-	}
-	for _, tt := range tests {
 	m := NewMsg()
-		t.Run(tt.name, func(t *testing.T) {
+	part := m.newPart(TypeTextPlain, WithSMimeSinging())
-			part := m.newPart(TypeTextPlain, WithContentDisposition(tt.disposition), nil)
 	if part == nil {
-				t.Errorf("newPart() WithPartContentDescription() failed: no part returned")
+		t.Errorf("newPart() WithSMimeSinging() failed: no part returned")
 		return
 	}
-			if part.disposition != tt.disposition {
+	if part.smime != true {
-				t.Errorf("newPart() WithContentDisposition() failed: expected: %s, got: %s", tt.disposition, part.description)
+		t.Errorf("newPart() WithSMimeSinging() failed: expected: %v, got: %v", true, part.smime)
 	}
-			part.disposition = ""
+	part.smime = true
-			part.SetDisposition(tt.disposition)
+	part.SetIsSMimeSigned(false)
-			if part.disposition != tt.disposition {
+	if part.smime != false {
-				t.Errorf("newPart() SetDisposition() failed: expected: %s, got: %s", tt.disposition, part.description)
+		t.Errorf("newPart() SetIsSMimeSigned() failed: expected: %v, got: %v", false, part.smime)
-			}
-		})
 	}
 }
 
@@ -274,6 +263,32 @@ func TestPart_GetContentBroken(t *testing.T) {
 	}
 }
 
+// TestPart_IsSMimeSigned tests Part.IsSMimeSigned
+func TestPart_IsSMimeSigned(t *testing.T) {
+	tests := []struct {
+		name string
+		want bool
+	}{
+		{"smime:", true},
+		{"smime:", false},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			m := NewMsg()
+			pl, err := getPartList(m)
+			if err != nil {
+				t.Errorf("failed: %s", err)
+				return
+			}
+			pl[0].SetIsSMimeSigned(tt.want)
+			smime := pl[0].IsSMimeSigned()
+			if smime != tt.want {
+				t.Errorf("SetContentType failed. Got: %v, expected: %v", smime, tt.want)
+			}
+		})
+	}
+}
+
 // TestPart_SetWriteFunc tests Part.SetWriteFunc
 func TestPart_SetWriteFunc(t *testing.T) {
 	c := "This is a test with ümläutß"
@@ -352,31 +367,6 @@ func TestPart_SetDescription(t *testing.T) {
 	}
 }
 
-// TestPart_SetDisposition tests Part.SetDisposition
-func TestPart_SetDisposition(t *testing.T) {
-	c := "This is a test"
-	d := Disposition("test-disposition")
-	m := NewMsg()
-	m.SetBodyString(TypeTextPlain, c)
-	pl, err := getPartList(m)
-	if err != nil {
-		t.Errorf("failed: %s", err)
-		return
-	}
-	pd := pl[0].GetDisposition()
-	if pd != "" {
-		t.Errorf("Part.GetDisposition failed. Expected empty description but got: %s", pd)
-	}
-	pl[0].SetDisposition(d)
-	if pl[0].disposition != d {
-		t.Errorf("Part.SetDisposition failed. Expected description to be: %s, got: %s", d, pd)
-	}
-	pd = pl[0].GetDisposition()
-	if pd != d {
-		t.Errorf("Part.GetDisposition failed. Expected: %s, got: %s", d, pd)
-	}
-}
-
 // TestPart_Delete tests Part.Delete
 func TestPart_Delete(t *testing.T) {
 	c := "This is a test with ümläutß"