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47 lines
1.5 KiB
Ruby
47 lines
1.5 KiB
Ruby
# frozen_string_literal: true
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class Chat::DuplicateMessageValidator
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attr_reader :chat_message
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def initialize(chat_message)
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@chat_message = chat_message
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end
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def validate
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return if SiteSetting.chat_duplicate_message_sensitivity.zero?
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matrix =
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Chat::DuplicateMessageValidator.sensitivity_matrix(
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SiteSetting.chat_duplicate_message_sensitivity,
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)
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# Check if the length of the message is too short to check for a duplicate message
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return if chat_message.message.length < matrix[:min_message_length]
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# Check if there are enough users in the channel to check for a duplicate message
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return if (chat_message.chat_channel.user_count || 0) < matrix[:min_user_count]
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# Check if the same duplicate message has been posted in the last N seconds by any user
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if !chat_message
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.chat_channel
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.chat_messages
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.where("created_at > ?", matrix[:min_past_seconds].seconds.ago)
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.where(message: chat_message.message)
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.exists?
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return
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end
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chat_message.errors.add(:base, I18n.t("chat.errors.duplicate_message"))
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end
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def self.sensitivity_matrix(sensitivity)
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{
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# 0.1 sensitivity = 100 users and 1.0 sensitivity = 5 users.
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min_user_count: (-1.0 * 105.5 * sensitivity + 110.55).to_i,
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# 0.1 sensitivity = 30 chars and 1.0 sensitivity = 10 chars.
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min_message_length: (-1.0 * 22.2 * sensitivity + 32.22).to_i,
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# 0.1 sensitivity = 10 seconds and 1.0 sensitivity = 60 seconds.
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min_past_seconds: (55.55 * sensitivity + 4.5).to_i,
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}
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end
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end
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