Simple email parser in ruby

parse_email

#!/usr/bin/ruby

#Returns an email dictionary that includes all of an emails headers as well as each part of the email
#You can reference which part of the email you'd like by its content type
#Ex: email['parts']['text/html'] will get you the text/html version of the email body
#You can reference headers by the header name
#Ex: email['headers']['To'] will return the value of the "to" field
def headers_and_parts(file_path)
    headers = {}
    file = File.new(file_path, "r")
    
    #loop until the first body part
    while(line = file.gets)
        if line[0,2] == '--'#We found the first body part
            break
        elsif #Its a header
            header_parts = line.split(': ')
            if header_parts.length == 2
                headers[header_parts[0]] = header_parts[1].strip
            end
        end
    end
    boundary = ''
    #Get the boundary string from the content-type header
    headers['Content-Type'].split('; ').each do |value|
        if value.include? "boundary"
            boundary = value.split('=')[1].strip
        end
    end

    body_parts = {}

    #recursively loop over each body part
    parse_body_part(boundary, file, body_parts)
    file.close

    return {'headers'=>headers, 'parts'=>body_parts }

end

#Takes in part of a file object.
#Starting with the first line after "--boundary"
def parse_body_part(boundary, file, parts)
    body_part = {}
    body_part['content-type'] = file.gets.split(': ')[1].split('; ')[0]
    body_part['body'] = ''
    while(line = file.gets)
        #start of the next body
        if line.strip == "--#{boundary}"
            parse_body_part(boundary, file, parts)
        elsif line.strip == "--#{boundary}--"
            break
        else
            body_part['body'] += line
            #Add the line to the "body"
        
        end
    end
    parts[body_part['content-type']] = body_part['body']
end

email = headers_and_parts('email.txt')

#print all the headers 
email['headers'].each { |header| puts "#{header[0]}: #{header[1]}" }

#print the plaintext version of the email
puts email['parts']['text/plain']