google mail API [[[WIP]]]

2023-12-01 18:33:04 +01:00
parent 8f15d42173
commit 8f13eb2f16
6 changed files with 325 additions and 0 deletions
--- a/googleapi/sendMail.go
+++ b/googleapi/sendMail.go
@@ -0,0 +1,127 @@
+package googleapi
+
+import (
+	"gogs.mikescher.com/BlackForestBytes/goext/langext"
+	"mime"
+	"strings"
+	"time"
+)
+
+func (c *client) SendMail(from string, recipients []string, cc []string, bcc []string, subject string, body MailBody, attachments []MailAttachment) error {
+
+	data := make([]string, 0, 32)
+
+	data = append(data, "Date: "+time.Now().Format(time.RFC1123Z))
+	data = append(data, "From: "+mime.QEncoding.Encode("UTF-8", from))
+	data = append(data, "To: "+strings.Join(langext.ArrMap(recipients, func(v string) string { return mime.QEncoding.Encode("UTF-8", v) }), ", "))
+	if len(cc) > 0 {
+		data = append(data, "To: "+strings.Join(langext.ArrMap(cc, func(v string) string { return mime.QEncoding.Encode("UTF-8", v) }), ", "))
+	}
+	if len(bcc) > 0 {
+		data = append(data, "Bcc: "+strings.Join(langext.ArrMap(bcc, func(v string) string { return mime.QEncoding.Encode("UTF-8", v) }), ", "))
+	}
+	data = append(data, "Subject: "+mime.QEncoding.Encode("UTF-8", subject))
+
+	hasAttachments := len(attachments) > 0
+	hasInlineAttachments := langext.ArrAny(attachments, func(v MailAttachment) bool { return v.IsInline })
+	hasPlain := body.Plain != nil
+	hasHTML := body.HTML != nil
+
+	mixedBoundary := "--------------" + langext.MustRawHexUUID()
+	relatedBoundary := "--------------" + langext.MustRawHexUUID()
+	altBoundary := "--------------" + langext.MustRawHexUUID()
+
+	inlineAttachments := langext.ArrFilter(attachments, func(v MailAttachment) bool { return v.IsInline })
+	normalAttachments := langext.ArrFilter(attachments, func(v MailAttachment) bool { return !v.IsInline })
+
+	if hasInlineAttachments {
+		// "mixed+related"
+
+		data = append(data, "Content-Type: multipart/mixed; boundary="+mixedBoundary)
+		data = append(data, "")
+		data = append(data, mixedBoundary)
+
+		data = append(data, "Content-Type: multipart/related; boundary="+relatedBoundary)
+		data = append(data, "")
+
+		data = append(data, c.dumpHTMLBody(body, hasInlineAttachments, hasAttachments, relatedBoundary, altBoundary)...)
+		data = append(data, "")
+
+		for i, attachment := range inlineAttachments {
+			data = append(data, relatedBoundary)
+			data = append(data, attachment.dump()...)
+
+			if i < len(inlineAttachments)-1 {
+				data = append(data, "")
+			}
+		}
+
+		data = append(data, relatedBoundary)
+
+		for i, attachment := range normalAttachments {
+			data = append(data, mixedBoundary)
+			data = append(data, attachment.dump()...)
+
+			if i < len(inlineAttachments)-1 {
+				data = append(data, "")
+			}
+		}
+
+		data = append(data, mixedBoundary)
+
+	} else if hasAttachments {
+		// "mixed"
+
+		//TODO https://github.dev/muratgozel/MIMEText/blob/master/src/MIMEMessage.ts
+
+	} else if hasPlain && hasHTML {
+		// "alternative"
+
+		//TODO https://github.dev/muratgozel/MIMEText/blob/master/src/MIMEMessage.ts
+
+	} else {
+		// "plain"
+
+		//TODO https://github.dev/muratgozel/MIMEText/blob/master/src/MIMEMessage.ts
+
+	}
+
+}
+
+func (c *client) dumpHTMLBody(body MailBody, hasInlineAttachments bool, hasAttachments bool, boundary string, boundaryAlt string) []string {
+
+	data := make([]string, 0, 16)
+
+	if body.HTML != nil && body.Plain != nil && hasInlineAttachments {
+		data = append(data, boundary)
+		data = append(data, *body.HTML)
+	} else if body.HTML != nil && body.Plain != nil && hasAttachments {
+		data = append(data, boundary)
+		data = append(data, "Content-Type: multipart/alternative; boundary="+boundaryAlt)
+		data = append(data, "")
+		data = append(data, boundaryAlt)
+		data = append(data, *body.Plain)
+		data = append(data, "")
+		data = append(data, boundaryAlt)
+		data = append(data, *body.HTML)
+		data = append(data, "")
+		data = append(data, boundaryAlt)
+	} else if body.HTML != nil && body.Plain != nil {
+		data = append(data, boundary)
+		data = append(data, *body.Plain)
+		data = append(data, "")
+		data = append(data, boundary)
+		data = append(data, *body.HTML)
+	} else if body.HTML != nil {
+		data = append(data, boundary)
+		data = append(data, *body.HTML)
+	} else if body.Plain != nil {
+		data = append(data, boundary)
+		data = append(data, *body.Plain)
+	} else {
+		data = append(data, boundary)
+		data = append(data, "") // no content ?!?
+	}
+
+	return data
+}