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# frozen_string_literal: true
# -----------------------------------------------------------------------------
#
# SRS database interface
#
# -----------------------------------------------------------------------------
require "net/http"
module RGeo
module CoordSys
module SRSDatabase
# A spatial reference database implementation that fetches data from
# internet URLs.
class UrlReader
# Create a URL-based spatial reference database.
#
# Options:
#
# [<tt>:cache</tt>]
# If set to true, lookup results are cached so if the same URL
# is requested again, the result is served from cache rather
# than issuing another HTTP request. Default is false.
def initialize(opts = {})
@cache = opts[:cache] ? {} : nil
end
# Retrieve the given URL and return an Entry.
# Returns nil if the URL cannot be read as an OGC WKT or Proj4
# coordinate system
def get(ident)
ident = ident.to_s
return @cache[ident] if @cache&.include?(ident)
uri = URI.parse(ident)
result = nil
Net::HTTP.start(uri.host, uri.port) do |http|
request = uri.path
request = "#{request}?#{uri.query}" if uri.query
response = http.requestget(request)
if response.is_a?(Net::HTTPSuccess)
response = response.body.strip
if response[0, 1] == "+"
result = Entry.new(ident, proj4: response)
else
result = Entry.new(ident, coord_sys: response)
end
end
end
@cache[ident] = result if @cache
result
end
# Clear the cache if one is present.
def clear_cache
@cache&.clear
end
end
end
end
end
Version data entries
9 entries across 9 versions & 1 rubygems