docs: remove mail rendering problem TODO

before, if the mail content-type was text, it would not consider the
content encoding, only if it was multipart.

now this step on the mail parsing is performed both on multipart mails
and in text mails

README.md

@@ -38,7 +38,6 @@ Available env variables:
 
 ## TODO
 
- - Some emails are not rendering (it parses the header but not the content)
  - Restart when either mail or web server dies
  - Handle attachments
  - Do not store the raw mail data in the DB, maybe use block storage (the provider can be a disk provider at first)

pkg/mail_utils/mail_utils.go

@@ -55,11 +55,11 @@ func Parse_mime_format(s string) (MIMEType, bool) {
 	}
 
 	switch {
-	case strings.Compare(s, "html") == 0:
+	case strings.EqualFold(s, "html"):
 		t = Html
-	case strings.Compare(s, "md") == 0:
+	case strings.EqualFold(s, "md"):
 		t = Markdown
-	case strings.Compare(s, "text") == 0:
+	case strings.EqualFold(s, "text"):
 		t = PlainText
 	default:
 		return t, false
@@ -100,8 +100,14 @@ func Parse_mail(m_data []byte, header_only bool) (Mail_obj, error) {
 		}
 
 		var body Mail_body
-		body.MimeType = PlainText
-		body.Data = string(txt_bytes)
+
+		mail_body, err := Parse_mail_part(mail_msg.Header, txt_bytes)
+		if err != nil {
+			return m, err
+		}
+
+		body.Data = mail_body.Data
+		body.MimeType = mail_body.MimeType
 
 		m.MediaType = NotMultipart
 		m.Body = append(m.Body, body)
@@ -117,7 +123,7 @@ func Parse_mail(m_data []byte, header_only bool) (Mail_obj, error) {
 		return m, errors.New("Not supported multipart type")
 	}
 
-	body, err := Parse_mail_part(mail_msg.Body, params["boundary"])
+	body, err := Parse_mail_multipart(mail_msg.Body, params["boundary"])
 	if err != nil {
 		return m, err
 	}
@@ -127,7 +133,52 @@ func Parse_mail(m_data []byte, header_only bool) (Mail_obj, error) {
 	return m, nil
 }
 
-func Parse_mail_part(mime_data io.Reader, boundary string) ([]Mail_body, error) {
+type Header interface {
+	Get(string) string
+}
+
+func Parse_mail_part(header Header, body []byte) (Mail_body, error) {
+	content_transfer_encoding := header.Get("Content-Transfer-Encoding")
+	content_type := header.Get("Content-Type")
+
+	var mail_body Mail_body
+
+	switch {
+	case strings.HasPrefix(content_type, "text/plain"):
+		mail_body.MimeType = PlainText
+	case strings.HasPrefix(content_type, "text/markdown"):
+		mail_body.MimeType = Markdown
+	case strings.HasPrefix(content_type, "text/html"):
+		mail_body.MimeType = Html
+	default:
+		return mail_body, errors.New("Content type not supported: " + content_type)
+	}
+
+	switch {
+	case strings.EqualFold(content_transfer_encoding, "BASE64"):
+		decoded_content, err := base64.StdEncoding.DecodeString(string(body))
+		if err != nil {
+			return mail_body, err
+		}
+
+		mail_body.Data = string(decoded_content)
+
+	case strings.EqualFold(content_transfer_encoding, "QUOTED-PRINTABLE"):
+		decoded_content, err := io.ReadAll(quotedprintable.NewReader(bytes.NewReader(body)))
+		if err != nil {
+			return mail_body, err
+		}
+
+		mail_body.Data = string(decoded_content)
+
+	default:
+		mail_body.Data = string(body)
+	}
+
+	return mail_body, nil
+}
+
+func Parse_mail_multipart(mime_data io.Reader, boundary string) ([]Mail_body, error) {
 	var body []Mail_body
 
 	reader := multipart.NewReader(mime_data, boundary)
@@ -152,7 +203,7 @@ func Parse_mail_part(mime_data io.Reader, boundary string) ([]Mail_body, error)
 		}
 
 		if strings.HasPrefix(mediaType, "multipart/") {
-			body_part, err := Parse_mail_part(new_part, params["boundary"])
+			body_part, err := Parse_mail_multipart(new_part, params["boundary"])
 			if err != nil {
 				return body, err
 			}
@@ -165,43 +216,10 @@ func Parse_mail_part(mime_data io.Reader, boundary string) ([]Mail_body, error)
 			if err != nil {
 				return body, err
 			}
-			content_transfer_encoding := new_part.Header.Get("Content-Transfer-Encoding")
-			content_type := new_part.Header.Get("Content-Type")
-
-			var part_body Mail_body
-
-			switch {
-			case strings.HasPrefix(content_type, "text/plain"):
-				part_body.MimeType = PlainText
-			case strings.HasPrefix(content_type, "text/markdown"):
-				part_body.MimeType = Markdown
-			case strings.HasPrefix(content_type, "text/html"):
-				part_body.MimeType = Html
-			default:
-				return body, errors.New("Content type not supported: " + content_type)
+			part_body, err := Parse_mail_part(new_part.Header, part_data)
+			if err != nil {
+				return body, err
 			}
-
-			switch {
-			case strings.Compare(content_transfer_encoding, "BASE64") == 0:
-				decoded_content, err := base64.StdEncoding.DecodeString(string(part_data))
-				if err != nil {
-					return body, err
-				}
-
-				part_body.Data = string(decoded_content)
-
-			case strings.Compare(content_transfer_encoding, "QUOTED-PRINTABLE") == 0:
-				decoded_content, err := io.ReadAll(quotedprintable.NewReader(bytes.NewReader(part_data)))
-				if err != nil {
-					return body, err
-				}
-
-				part_body.Data = string(decoded_content)
-
-			default:
-				part_body.Data = string(part_data)
-			}
-
 			body = append(body, part_body)
 
 		}