code writing and migration

doc.go

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+/*
+Package gomail basic jordan-wright/email wrapper
+*/
+package mail // import "github.com/miajio/goemail"

go.mod

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+module github.com/miajio/goemail
+
+go 1.21.3

mail/attachment.go

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+package mail
+
+import (
+	"fmt"
+	"net/textproto"
+)
+
+// Attachment
+// is email attachement param type
+// Based on the mime/multipart.FileHeader struct
+// Attachment contains the name, MIMEHeader, and content of the attachment in question
+type Attachment struct {
+	FileName    string               // fileName
+	ContentType string               // content type
+	Header      textproto.MIMEHeader // header
+	Content     []byte               // content
+	HTMLRelated bool
+}
+
+func (at *Attachment) setDefaultHeaders() {
+	contentType := "application/octet-stream"
+	if len(at.ContentType) > 0 {
+		contentType = at.ContentType
+	}
+	at.Header.Set("Content-Type", contentType)
+
+	if len(at.Header.Get("Content-Disposition")) == 0 {
+		disposition := "attachment"
+		if at.HTMLRelated {
+			disposition = "inline"
+		}
+		at.Header.Set("Content-Disposition", fmt.Sprintf("%s;\r\n filename=\"%s\"", disposition, at.FileName))
+	}
+	if len(at.Header.Get("Content-ID")) == 0 {
+		at.Header.Set("Content-ID", fmt.Sprintf("<%s>", at.FileName))
+	}
+	if len(at.Header.Get("Content-Transfer-Encoding")) == 0 {
+		at.Header.Set("Content-Transfer-Encoding", "base64")
+	}
+}