67 lines
		
	
	
	
		
			1.6 KiB
		
	
	
	
		
			Ruby
		
	
	
	
	
	
			
		
		
	
	
			67 lines
		
	
	
	
		
			1.6 KiB
		
	
	
	
		
			Ruby
		
	
	
	
	
	
| # frozen_string_literal: true
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| 
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| class Webhooks::PayloadRenderer
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|   class DocumentTraverser
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|     INT_REGEX = /[0-9]+/
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| 
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|     def initialize(document)
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|       @document = document.with_indifferent_access
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|     end
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| 
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|     def get(path)
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|       value  = @document.dig(*parse_path(path))
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|       string = Oj.dump(value)
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| 
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|       # We want to make sure people can use the variable inside
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|       # other strings, so it can't be wrapped in quotes.
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|       if value.is_a?(String)
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|         string[1...-1]
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|       else
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|         string
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|       end
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|     end
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| 
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|     private
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| 
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|     def parse_path(path)
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|       path.split('.').filter_map do |segment|
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|         if segment.match(INT_REGEX)
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|           segment.to_i
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|         else
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|           segment.presence
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|         end
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|       end
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|     end
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|   end
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| 
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|   class TemplateParser < Parslet::Parser
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|     rule(:dot) { str('.') }
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|     rule(:digit) { match('[0-9]') }
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|     rule(:property_name) { match('[a-z_]').repeat(1) }
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|     rule(:array_index) { digit.repeat(1) }
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|     rule(:segment) { (property_name | array_index) }
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|     rule(:path) { property_name >> (dot >> segment).repeat }
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|     rule(:variable) { (str('}}').absent? >> path).repeat.as(:variable) }
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|     rule(:expression) { str('{{') >> variable >> str('}}') }
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|     rule(:text) { (str('{{').absent? >> any).repeat(1) }
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|     rule(:text_with_expressions) { (text.as(:text) | expression).repeat.as(:text) }
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|     root(:text_with_expressions)
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|   end
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| 
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|   EXPRESSION_REGEXP = /
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|     \{\{
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|       [a-z_]+
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|       (\.
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|         ([a-z_]+|[0-9]+)
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|       )*
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|     \}\}
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|   /iox
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| 
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|   def initialize(json)
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|     @document = DocumentTraverser.new(Oj.load(json))
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|   end
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| 
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|   def render(template)
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|     template.gsub(EXPRESSION_REGEXP) { |match| @document.get(match[2...-2]) }
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|   end
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| end
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