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371eff1f66
If this is *not* done, then the decoded body will already be considered to be encoded, e.g.: ``` pry(main)> puts part Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: base64 PGh0bWw+PGhlYWQ+PC9oZWFkPjxib2R5Pjxicj48YnI+PGRpdiBjbGFzcz0i cHJvdG9ubWFpbF9zaWduYXR1cmVfYmxvY2stdXNlciI+PC9kaXY+PGJyPjxi cj5TZW50IGZyb20gPGEgdGFyZ2V0PSJfYmxhbmsiIGhyZWY9Imh0dHBzOi8v cHJvdG9uLm1lL21haWwvaG9tZSIgcmVsPSJub3JlZmVycmVyIj5Qcm90b24g TWFpbDwvYT4gZm9yIEFuZHJvaWQuPC9ib2R5PjwvaHRtbD4= pry(main)> part.body = part.body.decoded => "<html><head></head><body><br><br><div class=\"protonmail_signature_block-user\"></div><br><br>Sent from <a target=\"_blank\" href=\"https://proton.me/mail/home\" rel=\"noreferrer\">Proton Mail</a> for Android.</body></html>" pry(main)> puts part Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: base64 htmlhead/headbodybrbrdivclassprotonmailsignatureblockuser/di vbrbrSentfromatargetblankhrefhttps//protonme/mail/homerelnor eferrerProtonMail/aforAndroid/body/htmk= ``` Clearing the CTE indicates to the Mail gem that the content needs to be encoded if necessary.
56 lines
1.6 KiB
Ruby
56 lines
1.6 KiB
Ruby
# frozen_string_literal: true
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module Email
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class Cleaner
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def initialize(mail, remove_attachments: true, truncate: true, rejected: false)
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@mail = Mail.new(mail)
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@mail.charset = "UTF-8"
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# The default sort order may incorrectly put postscripts to the message
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# (e.g. such as those that might be appended by mailing lists as in
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# https://meta.discourse.org/t/377793/21) ahead of "real content"
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#
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# default is: "text/plain", "text/enriched", "text/html", "multipart/alternative"
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@mail.body.set_sort_order([])
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@remove_attachments = remove_attachments
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@truncate = truncate
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@rejected = rejected
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end
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def execute
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@mail.without_attachments! if @remove_attachments
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truncate! if @truncate
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remove_null_byte(@mail.to_s)
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end
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def self.delete_rejected!
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IncomingEmail.delete_by(
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"rejection_message IS NOT NULL AND created_at < ?",
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SiteSetting.delete_rejected_email_after_days.days.ago,
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)
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end
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private
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def truncate!
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parts.each do |part|
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part.body = part.body.decoded.truncate(truncate_limit, omission: "")
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# let the serialiser re-encode it with an appropriate format - leaving
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# the original one set tells Mail that the content is *already* encoded
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part.content_transfer_encoding = nil
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end
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end
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def parts
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@mail.multipart? ? @mail.parts : [@mail]
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end
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def truncate_limit
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@rejected ? SiteSetting.raw_rejected_email_max_length : SiteSetting.raw_email_max_length
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end
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def remove_null_byte(message)
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message.gsub!("\x00", "")
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message
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end
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end
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end
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