[bugfix] Include MIME email headers to avoid mangling non-ascii text (#2827)

internal/email/common.go

@@ -105,6 +105,9 @@ func assembleMessage(mailSubject string, mailBody string, mailFrom string, mailT
 	}
 	msg.WriteString("From: " + mailFrom + CRLF)
 	msg.WriteString("Subject: " + mailSubject + CRLF)
+	msg.WriteString("MIME-Version: 1.0" + CRLF)
+	msg.WriteString("Content-Transfer-Encoding: 8bit" + CRLF)
+	msg.WriteString("Content-Type: text/plain; charset=\"UTF-8\"" + CRLF)
 	msg.WriteString(CRLF)
 	msg.WriteString(mailBody)
 	msg.WriteString(CRLF)

internal/email/email_test.go

@@ -50,7 +50,7 @@ func (suite *EmailTestSuite) TestTemplateConfirm() {
 
 	suite.sender.SendConfirmEmail("user@example.org", confirmData)
 	suite.Len(suite.sentEmails, 1)
-	suite.Equal("To: user@example.org\r\nFrom: test@example.org\r\nSubject: GoToSocial Email Confirmation\r\n\r\nHello test!\r\n\r\nYou are receiving this mail because you've requested an account on https://example.org.\r\n\r\nTo use your account, you must confirm that this is your email address.\r\n\r\nTo confirm your email, paste the following in your browser's address bar:\r\n\r\nhttps://example.org/confirm_email?token=ee24f71d-e615-43f9-afae-385c0799b7fa\r\n\r\nIf you believe you've been sent this email in error, feel free to ignore it, or contact the administrator of https://example.org.\r\n\r\n", suite.sentEmails["user@example.org"])
+	suite.Equal("To: user@example.org\r\nFrom: test@example.org\r\nSubject: GoToSocial Email Confirmation\r\nMIME-Version: 1.0\r\nContent-Transfer-Encoding: 8bit\r\nContent-Type: text/plain; charset=\"UTF-8\"\r\n\r\nHello test!\r\n\r\nYou are receiving this mail because you've requested an account on https://example.org.\r\n\r\nTo use your account, you must confirm that this is your email address.\r\n\r\nTo confirm your email, paste the following in your browser's address bar:\r\n\r\nhttps://example.org/confirm_email?token=ee24f71d-e615-43f9-afae-385c0799b7fa\r\n\r\nIf you believe you've been sent this email in error, feel free to ignore it, or contact the administrator of https://example.org.\r\n\r\n", suite.sentEmails["user@example.org"])
 }
 
 func (suite *EmailTestSuite) TestTemplateReset() {
@@ -63,7 +63,7 @@ func (suite *EmailTestSuite) TestTemplateReset() {
 
 	suite.sender.SendResetEmail("user@example.org", resetData)
 	suite.Len(suite.sentEmails, 1)
-	suite.Equal("To: user@example.org\r\nFrom: test@example.org\r\nSubject: GoToSocial Password Reset\r\n\r\nHello test!\r\n\r\nYou are receiving this mail because a password reset has been requested for your account on https://example.org.\r\n\r\nTo reset your password, paste the following in your browser's address bar:\r\n\r\nhttps://example.org/reset_email?token=ee24f71d-e615-43f9-afae-385c0799b7fa\r\n\r\nIf you believe you've been sent this email in error, feel free to ignore it, or contact the administrator of https://example.org.\r\n\r\n", suite.sentEmails["user@example.org"])
+	suite.Equal("To: user@example.org\r\nFrom: test@example.org\r\nSubject: GoToSocial Password Reset\r\nMIME-Version: 1.0\r\nContent-Transfer-Encoding: 8bit\r\nContent-Type: text/plain; charset=\"UTF-8\"\r\n\r\nHello test!\r\n\r\nYou are receiving this mail because a password reset has been requested for your account on https://example.org.\r\n\r\nTo reset your password, paste the following in your browser's address bar:\r\n\r\nhttps://example.org/reset_email?token=ee24f71d-e615-43f9-afae-385c0799b7fa\r\n\r\nIf you believe you've been sent this email in error, feel free to ignore it, or contact the administrator of https://example.org.\r\n\r\n", suite.sentEmails["user@example.org"])
 }
 
 func (suite *EmailTestSuite) TestTemplateReportRemoteToLocal() {
@@ -80,7 +80,7 @@ func (suite *EmailTestSuite) TestTemplateReportRemoteToLocal() {
 		suite.FailNow(err.Error())
 	}
 	suite.Len(suite.sentEmails, 1)
-	suite.Equal("To: user@example.org\r\nFrom: test@example.org\r\nSubject: GoToSocial New Report\r\n\r\nHello moderator of Test Instance (https://example.org)!\r\n\r\nSomeone from fossbros-anonymous.io has reported a user from your instance.\r\n\r\nTo view the report, paste the following link into your browser: https://example.org/settings/admin/reports/01GVJHN1RTYZCZTCXVPPPKBX6R\r\n\r\n", suite.sentEmails["user@example.org"])
+	suite.Equal("To: user@example.org\r\nFrom: test@example.org\r\nSubject: GoToSocial New Report\r\nMIME-Version: 1.0\r\nContent-Transfer-Encoding: 8bit\r\nContent-Type: text/plain; charset=\"UTF-8\"\r\n\r\nHello moderator of Test Instance (https://example.org)!\r\n\r\nSomeone from fossbros-anonymous.io has reported a user from your instance.\r\n\r\nTo view the report, paste the following link into your browser: https://example.org/settings/admin/reports/01GVJHN1RTYZCZTCXVPPPKBX6R\r\n\r\n", suite.sentEmails["user@example.org"])
 }
 
 func (suite *EmailTestSuite) TestTemplateReportLocalToRemote() {
@@ -97,7 +97,7 @@ func (suite *EmailTestSuite) TestTemplateReportLocalToRemote() {
 		suite.FailNow(err.Error())
 	}
 	suite.Len(suite.sentEmails, 1)
-	suite.Equal("To: user@example.org\r\nFrom: test@example.org\r\nSubject: GoToSocial New Report\r\n\r\nHello moderator of Test Instance (https://example.org)!\r\n\r\nSomeone from your instance has reported a user from fossbros-anonymous.io.\r\n\r\nTo view the report, paste the following link into your browser: https://example.org/settings/admin/reports/01GVJHN1RTYZCZTCXVPPPKBX6R\r\n\r\n", suite.sentEmails["user@example.org"])
+	suite.Equal("To: user@example.org\r\nFrom: test@example.org\r\nSubject: GoToSocial New Report\r\nMIME-Version: 1.0\r\nContent-Transfer-Encoding: 8bit\r\nContent-Type: text/plain; charset=\"UTF-8\"\r\n\r\nHello moderator of Test Instance (https://example.org)!\r\n\r\nSomeone from your instance has reported a user from fossbros-anonymous.io.\r\n\r\nTo view the report, paste the following link into your browser: https://example.org/settings/admin/reports/01GVJHN1RTYZCZTCXVPPPKBX6R\r\n\r\n", suite.sentEmails["user@example.org"])
 }
 
 func (suite *EmailTestSuite) TestTemplateReportLocalToLocal() {
@@ -114,7 +114,7 @@ func (suite *EmailTestSuite) TestTemplateReportLocalToLocal() {
 		suite.FailNow(err.Error())
 	}
 	suite.Len(suite.sentEmails, 1)
-	suite.Equal("To: user@example.org\r\nFrom: test@example.org\r\nSubject: GoToSocial New Report\r\n\r\nHello moderator of Test Instance (https://example.org)!\r\n\r\nSomeone from your instance has reported another user from your instance.\r\n\r\nTo view the report, paste the following link into your browser: https://example.org/settings/admin/reports/01GVJHN1RTYZCZTCXVPPPKBX6R\r\n\r\n", suite.sentEmails["user@example.org"])
+	suite.Equal("To: user@example.org\r\nFrom: test@example.org\r\nSubject: GoToSocial New Report\r\nMIME-Version: 1.0\r\nContent-Transfer-Encoding: 8bit\r\nContent-Type: text/plain; charset=\"UTF-8\"\r\n\r\nHello moderator of Test Instance (https://example.org)!\r\n\r\nSomeone from your instance has reported another user from your instance.\r\n\r\nTo view the report, paste the following link into your browser: https://example.org/settings/admin/reports/01GVJHN1RTYZCZTCXVPPPKBX6R\r\n\r\n", suite.sentEmails["user@example.org"])
 }
 
 func (suite *EmailTestSuite) TestTemplateReportMoreThanOneModeratorAddress() {
@@ -131,7 +131,7 @@ func (suite *EmailTestSuite) TestTemplateReportMoreThanOneModeratorAddress() {
 		suite.FailNow(err.Error())
 	}
 	suite.Len(suite.sentEmails, 1)
-	suite.Equal("To: Undisclosed Recipients:;\r\nFrom: test@example.org\r\nSubject: GoToSocial New Report\r\n\r\nHello moderator of Test Instance (https://example.org)!\r\n\r\nSomeone from fossbros-anonymous.io has reported a user from your instance.\r\n\r\nTo view the report, paste the following link into your browser: https://example.org/settings/admin/reports/01GVJHN1RTYZCZTCXVPPPKBX6R\r\n\r\n", suite.sentEmails["user@example.org"])
+	suite.Equal("To: Undisclosed Recipients:;\r\nFrom: test@example.org\r\nSubject: GoToSocial New Report\r\nMIME-Version: 1.0\r\nContent-Transfer-Encoding: 8bit\r\nContent-Type: text/plain; charset=\"UTF-8\"\r\n\r\nHello moderator of Test Instance (https://example.org)!\r\n\r\nSomeone from fossbros-anonymous.io has reported a user from your instance.\r\n\r\nTo view the report, paste the following link into your browser: https://example.org/settings/admin/reports/01GVJHN1RTYZCZTCXVPPPKBX6R\r\n\r\n", suite.sentEmails["user@example.org"])
 }
 
 func (suite *EmailTestSuite) TestTemplateReportMoreThanOneModeratorAddressDisclose() {
@@ -150,7 +150,7 @@ func (suite *EmailTestSuite) TestTemplateReportMoreThanOneModeratorAddressDisclo
 		suite.FailNow(err.Error())
 	}
 	suite.Len(suite.sentEmails, 1)
-	suite.Equal("To: user@example.org, admin@example.org\r\nFrom: test@example.org\r\nSubject: GoToSocial New Report\r\n\r\nHello moderator of Test Instance (https://example.org)!\r\n\r\nSomeone from fossbros-anonymous.io has reported a user from your instance.\r\n\r\nTo view the report, paste the following link into your browser: https://example.org/settings/admin/reports/01GVJHN1RTYZCZTCXVPPPKBX6R\r\n\r\n", suite.sentEmails["user@example.org"])
+	suite.Equal("To: user@example.org, admin@example.org\r\nFrom: test@example.org\r\nSubject: GoToSocial New Report\r\nMIME-Version: 1.0\r\nContent-Transfer-Encoding: 8bit\r\nContent-Type: text/plain; charset=\"UTF-8\"\r\n\r\nHello moderator of Test Instance (https://example.org)!\r\n\r\nSomeone from fossbros-anonymous.io has reported a user from your instance.\r\n\r\nTo view the report, paste the following link into your browser: https://example.org/settings/admin/reports/01GVJHN1RTYZCZTCXVPPPKBX6R\r\n\r\n", suite.sentEmails["user@example.org"])
 }
 
 func (suite *EmailTestSuite) TestTemplateReportClosedOK() {
@@ -166,7 +166,7 @@ func (suite *EmailTestSuite) TestTemplateReportClosedOK() {
 		suite.FailNow(err.Error())
 	}
 	suite.Len(suite.sentEmails, 1)
-	suite.Equal("To: user@example.org\r\nFrom: test@example.org\r\nSubject: GoToSocial Report Closed\r\n\r\nHello !\r\n\r\nYou recently reported the account @foss_satan@fossbros-anonymous.io to the moderator(s) of Test Instance (https://example.org).\r\n\r\nThe report you submitted has now been closed.\r\n\r\nThe moderator who closed the report left the following comment: User was yeeted. Thank you for reporting!\r\n\r\n", suite.sentEmails["user@example.org"])
+	suite.Equal("To: user@example.org\r\nFrom: test@example.org\r\nSubject: GoToSocial Report Closed\r\nMIME-Version: 1.0\r\nContent-Transfer-Encoding: 8bit\r\nContent-Type: text/plain; charset=\"UTF-8\"\r\n\r\nHello !\r\n\r\nYou recently reported the account @foss_satan@fossbros-anonymous.io to the moderator(s) of Test Instance (https://example.org).\r\n\r\nThe report you submitted has now been closed.\r\n\r\nThe moderator who closed the report left the following comment: User was yeeted. Thank you for reporting!\r\n\r\n", suite.sentEmails["user@example.org"])
 }
 
 func (suite *EmailTestSuite) TestTemplateReportClosedLocalAccountNoComment() {
@@ -182,7 +182,7 @@ func (suite *EmailTestSuite) TestTemplateReportClosedLocalAccountNoComment() {
 		suite.FailNow(err.Error())
 	}
 	suite.Len(suite.sentEmails, 1)
-	suite.Equal("To: user@example.org\r\nFrom: test@example.org\r\nSubject: GoToSocial Report Closed\r\n\r\nHello !\r\n\r\nYou recently reported the account @1happyturtle to the moderator(s) of Test Instance (https://example.org).\r\n\r\nThe report you submitted has now been closed.\r\n\r\nThe moderator who closed the report did not leave a comment.\r\n\r\n", suite.sentEmails["user@example.org"])
+	suite.Equal("To: user@example.org\r\nFrom: test@example.org\r\nSubject: GoToSocial Report Closed\r\nMIME-Version: 1.0\r\nContent-Transfer-Encoding: 8bit\r\nContent-Type: text/plain; charset=\"UTF-8\"\r\n\r\nHello !\r\n\r\nYou recently reported the account @1happyturtle to the moderator(s) of Test Instance (https://example.org).\r\n\r\nThe report you submitted has now been closed.\r\n\r\nThe moderator who closed the report did not leave a comment.\r\n\r\n", suite.sentEmails["user@example.org"])
 }
 
 func TestEmailTestSuite(t *testing.T) {