85 lines
3.4 KiB
Ruby
85 lines
3.4 KiB
Ruby
class Whatsapp::SendOnWhatsappService < Base::SendOnChannelService
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private
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def channel_class
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Channel::Whatsapp
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end
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def perform_reply
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# can reply checks if 24 hour limit has passed.
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if message.conversation.can_reply?
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send_on_whatsapp
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else
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send_template_message
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end
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end
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def send_template_message
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name, namespace, lang_code, processed_parameters = processable_channel_message_template
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return if name.blank?
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message_id = channel.send_template(message.conversation.contact_inbox.source_id, {
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name: name,
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namespace: namespace,
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lang_code: lang_code,
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parameters: processed_parameters
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})
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message.update!(source_id: message_id) if message_id.present?
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end
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def processable_channel_message_template
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# see if we can match the message content to a template
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# An example template may look like "Your package has been shipped. It will be delivered in {{1}} business days.
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# We want to iterate over these templates with our message body and see if we can fit it to any of the templates
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# Then we use regex to parse the template varibles and convert them into the proper payload
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channel.message_templates.each do |template|
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match_obj = template_match_object(template)
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next if match_obj.blank?
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# we have a match, now we need to parse the template variables and convert them into the wa recommended format
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processed_parameters = match_obj.captures.map { |x| { type: 'text', text: x } }
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# no need to look up further end the search
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return [template['name'], template['namespace'], template['language'], processed_parameters]
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end
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[nil, nil, nil, nil]
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end
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def template_match_object(template)
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body_object = validated_body_object(template)
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return if body_object.blank?
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template_match_regex = build_template_match_regex(body_object['text'])
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message.content.match(template_match_regex)
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end
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def build_template_match_regex(template_text)
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# Converts the whatsapp template to a comparable regex string to check against the message content
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# the variables are of the format {{num}} ex:{{1}}
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# transform the template text into a regex string
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# we need to replace the {{num}} with matchers that can be used to capture the variables
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template_text = template_text.gsub(/{{\d}}/, '(.*)')
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# escape if there are regex characters in the template text
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template_text = Regexp.escape(template_text)
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# ensuring only the variables remain as capture groups
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template_text = template_text.gsub(Regexp.escape('(.*)'), '(.*)')
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template_match_string = "^#{template_text}$"
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Regexp.new template_match_string
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end
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def validated_body_object(template)
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# we don't care if its not approved template
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return if template['status'] != 'approved'
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# we only care about text body object in template. if not present we discard the template
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# we don't support other forms of templates
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template['components'].find { |obj| obj['type'] == 'BODY' && obj.key?('text') }
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end
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def send_on_whatsapp
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message_id = channel.send_message(message.conversation.contact_inbox.source_id, message)
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message.update!(source_id: message_id) if message_id.present?
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end
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end
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