google mail API [[FIN]]
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224
googleapi/mimeMessage.go
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224
googleapi/mimeMessage.go
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package googleapi
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import (
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"gogs.mikescher.com/BlackForestBytes/goext/langext"
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"mime"
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"strings"
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"time"
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)
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// https://datatracker.ietf.org/doc/html/rfc2822
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func encodeMimeMail(from string, recipients []string, cc []string, bcc []string, subject string, body MailBody, attachments []MailAttachment) string {
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data := make([]string, 0, 32)
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data = append(data, "Date: "+time.Now().Format(time.RFC1123Z))
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data = append(data, "MIME-Version: 1.0")
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data = append(data, "From: "+mime.QEncoding.Encode("UTF-8", from))
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data = append(data, "To: "+strings.Join(langext.ArrMap(recipients, func(v string) string { return mime.QEncoding.Encode("UTF-8", v) }), ", "))
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if len(cc) > 0 {
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data = append(data, "To: "+strings.Join(langext.ArrMap(cc, func(v string) string { return mime.QEncoding.Encode("UTF-8", v) }), ", "))
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}
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if len(bcc) > 0 {
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data = append(data, "Bcc: "+strings.Join(langext.ArrMap(bcc, func(v string) string { return mime.QEncoding.Encode("UTF-8", v) }), ", "))
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}
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data = append(data, "Subject: "+mime.QEncoding.Encode("UTF-8", subject))
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hasInlineAttachments := langext.ArrAny(attachments, func(v MailAttachment) bool { return v.IsInline })
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hasNormalAttachments := langext.ArrAny(attachments, func(v MailAttachment) bool { return !v.IsInline })
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hasPlain := body.Plain != ""
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hasHTML := body.HTML != ""
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mixedBoundary := langext.MustRawHexUUID()
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relatedBoundary := langext.MustRawHexUUID()
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altBoundary := langext.MustRawHexUUID()
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inlineAttachments := langext.ArrFilter(attachments, func(v MailAttachment) bool { return v.IsInline })
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normalAttachments := langext.ArrFilter(attachments, func(v MailAttachment) bool { return !v.IsInline })
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if hasInlineAttachments && hasNormalAttachments {
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// "mixed+related"
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data = append(data, "Content-Type: multipart/mixed; boundary="+mixedBoundary)
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data = append(data, "")
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data = append(data, "--"+mixedBoundary)
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data = append(data, "Content-Type: multipart/related; boundary="+relatedBoundary)
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data = append(data, "")
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data = append(data, dumpMailBody(body, hasInlineAttachments, hasNormalAttachments, relatedBoundary, altBoundary)...)
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data = append(data, "")
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for i, attachment := range inlineAttachments {
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data = append(data, "--"+relatedBoundary)
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data = append(data, attachment.dump()...)
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if i < len(inlineAttachments)-1 {
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data = append(data, "")
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}
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}
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data = append(data, "--"+relatedBoundary+"--")
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for i, attachment := range normalAttachments {
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data = append(data, "--"+mixedBoundary)
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data = append(data, attachment.dump()...)
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if i < len(normalAttachments)-1 {
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data = append(data, "")
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}
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}
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data = append(data, "--"+mixedBoundary+"--")
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} else if hasNormalAttachments {
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// "mixed"
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data = append(data, "Content-Type: multipart/mixed; boundary="+mixedBoundary)
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data = append(data, "")
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data = append(data, dumpMailBody(body, hasInlineAttachments, hasNormalAttachments, mixedBoundary, altBoundary)...)
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if hasPlain && hasHTML {
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data = append(data, "")
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}
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for i, attachment := range normalAttachments {
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data = append(data, "--"+mixedBoundary)
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data = append(data, attachment.dump()...)
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if i < len(normalAttachments)-1 {
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data = append(data, "")
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}
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}
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data = append(data, "--"+mixedBoundary+"--")
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} else if hasInlineAttachments {
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// "related"
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data = append(data, "Content-Type: multipart/related; boundary="+relatedBoundary)
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data = append(data, "")
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data = append(data, dumpMailBody(body, hasInlineAttachments, hasNormalAttachments, relatedBoundary, altBoundary)...)
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data = append(data, "")
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for i, attachment := range inlineAttachments {
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data = append(data, "--"+relatedBoundary)
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data = append(data, attachment.dump()...)
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if i < len(inlineAttachments)-1 {
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data = append(data, "")
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}
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}
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data = append(data, "--"+relatedBoundary+"--")
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} else if hasPlain && hasHTML {
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// "alternative"
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data = append(data, "Content-Type: multipart/alternative; boundary="+altBoundary)
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data = append(data, "")
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data = append(data, dumpMailBody(body, hasInlineAttachments, hasNormalAttachments, altBoundary, altBoundary)...)
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data = append(data, "")
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data = append(data, "--"+altBoundary+"--")
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} else if hasPlain {
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// "plain"
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data = append(data, "Content-Type: text/plain; charset=UTF-8")
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data = append(data, "Content-Transfer-Encoding: 7bit")
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data = append(data, "")
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data = append(data, body.Plain)
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} else if hasHTML {
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// "plain"
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data = append(data, "Content-Type: text/html; charset=UTF-8")
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data = append(data, "Content-Transfer-Encoding: 7bit")
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data = append(data, "")
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data = append(data, body.HTML)
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} else {
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// "empty??"
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}
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return strings.Join(data, "\r\n")
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}
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func dumpMailBody(body MailBody, hasInlineAttachments bool, hasNormalAttachments bool, boundary string, boundaryAlt string) []string {
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if body.HTML != "" && body.Plain != "" && !hasInlineAttachments && hasNormalAttachments {
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data := make([]string, 0, 16)
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data = append(data, "--"+boundary)
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data = append(data, "Content-Type: multipart/alternative; boundary="+boundaryAlt)
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data = append(data, "")
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data = append(data, "--"+boundaryAlt)
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data = append(data, "Content-Type: text/plain; charset=UTF-8")
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data = append(data, "Content-Transfer-Encoding: 7bit")
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data = append(data, "")
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data = append(data, body.Plain)
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data = append(data, "")
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data = append(data, "--"+boundaryAlt)
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data = append(data, "Content-Type: text/html; charset=UTF-8")
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data = append(data, "Content-Transfer-Encoding: 7bit")
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data = append(data, "")
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data = append(data, body.HTML)
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data = append(data, "")
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data = append(data, "--"+boundaryAlt+"--")
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return data
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}
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if body.HTML != "" && body.Plain != "" && hasInlineAttachments {
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data := make([]string, 0, 2)
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data = append(data, "--"+boundary)
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data = append(data, body.HTML)
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return data
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}
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if body.HTML != "" && body.Plain != "" {
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data := make([]string, 0, 8)
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data = append(data, "--"+boundary)
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data = append(data, "Content-Type: text/plain; charset=UTF-8")
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data = append(data, "Content-Transfer-Encoding: 7bit")
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data = append(data, "")
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data = append(data, body.Plain)
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data = append(data, "")
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data = append(data, "--"+boundary)
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data = append(data, "Content-Type: text/html; charset=UTF-8")
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data = append(data, "Content-Transfer-Encoding: 7bit")
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data = append(data, "")
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data = append(data, body.HTML)
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return data
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}
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if body.HTML != "" {
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data := make([]string, 0, 2)
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data = append(data, "--"+boundary)
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data = append(data, "Content-Type: text/html; charset=UTF-8")
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data = append(data, "Content-Transfer-Encoding: 7bit")
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data = append(data, "")
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data = append(data, body.HTML)
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return data
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}
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if body.Plain != "" {
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data := make([]string, 0, 2)
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data = append(data, "--"+boundary)
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data = append(data, "Content-Type: text/plain; charset=UTF-8")
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data = append(data, "Content-Transfer-Encoding: 7bit")
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data = append(data, "")
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data = append(data, body.Plain)
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return data
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}
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data := make([]string, 0, 16)
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data = append(data, "--"+boundary)
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data = append(data, "Content-Type: text/plain; charset=UTF-8")
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data = append(data, "Content-Transfer-Encoding: 7bit")
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data = append(data, "")
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data = append(data, "") // no content ?!?
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return data
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}
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