63 lines
1.9 KiB
Ruby
63 lines
1.9 KiB
Ruby
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require 'base64'
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require 'openssl'
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module Carto
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class GoogleMapsApi
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STATIC_IMAGE_BASE_URL = 'https://maps.googleapis.com/maps/api/staticmap'.freeze
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def sign_url(user, url)
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raise 'User does not have Google configured' unless user.google_maps_query_string.present?
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if user.google_maps_client_id.present? && user.google_maps_private_key.present?
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# Add client=xxx + signature
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client_id_signed_url(user, url)
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else
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# Just add key=xxx
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key_signed_url(user, url)
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end
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end
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def build_static_image_url(center:, map_type:, size:, zoom:, style:)
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style_string = parse_basemap_styles(style)
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STATIC_IMAGE_BASE_URL + "?center=#{center}&mapType=#{map_type}&size=#{size}#{style_string}&zoom=#{zoom}"
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end
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private
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def client_id_signed_url(user, url)
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uri = URI.parse("#{url}&#{user.google_maps_query_string}")
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payload_to_sign = uri.path + '?' + uri.query
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signature = hmac(user.google_maps_private_key, payload_to_sign)
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"#{uri}&signature=#{signature}"
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end
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def key_signed_url(user, url)
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"#{url}&#{user.google_maps_query_string}"
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end
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def hmac(key, data)
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binary_key = Base64.urlsafe_decode64(key)
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binary_signature = OpenSSL::HMAC.digest(OpenSSL::Digest.new('sha1'), binary_key, data)
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Base64.urlsafe_encode64(binary_signature)
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end
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def parse_basemap_styles(style_json)
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return '' unless style_json
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styles = style_json.map do |style_definition|
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style_parts = []
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style_parts << "feature:#{style_definition[:featureType] || 'all'}"
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style_parts << "element:#{style_definition[:elementType] || 'all'}"
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style_parts += parse_stylers(style_definition[:stylers])
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'&style=' + style_parts.join('|')
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end
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styles.join('')
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end
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def parse_stylers(stylers)
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stylers.flat_map do |styler|
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styler.map { |k, v| "#{k}:#{v.to_s.gsub('#', '0x')}" }
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end
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end
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end
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end
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