Initial commit; extracted Rack::Geo from Square API backend.

.gitignore

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+*.gem
+*.gemspec
+*.log
+*.pid
+*.sqlite3
+*.tmproj
+.DS_Store
+log/*
+pkg/*

HISTORY.rdoc

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+=== Version 0.1.0 (git)
+
+Initial release of Rack::Geo middleware.

LICENSE.txt

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+Copyright © 2010 Square, Inc.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.rdoc

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+= Rack::Geo
+
+Rack middleware for parsing and serializing IEFT draft {Geo-Position}[http://tools.ietf.org/html/draft-daviel-html-geo-tag-08] HTTP headers.
+
+== Prerequisites
+
+* {Rack}[http://rack.rubyforge.org/]
+
+== Testing
+
+Testing requires the RSpec gem:
+
+* {Rspec}[http://rspec.info/]
+
+To test, run:
+  `rake`
+
+== License
+
+Copyright © 2010 Square, Inc.
+See LICENSE.txt in this directory.

Rakefile

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+require 'rubygems'
+require 'rake'
+require 'spec/rake/spectask'
+
+require File.join(File.dirname(__FILE__), 'lib', 'rack', 'geo', 'version')
+
+begin
+  require 'jeweler'
+  Jeweler::Tasks.new do |gemspec|
+    gemspec.version = Rack::Geo::VERSION::STRING
+    gemspec.name = "rack-geo"
+    gemspec.summary = "Rack middleware for Geo-Position HTTP headers"
+    gemspec.description = "Parse and serialize geospatial HTTP headers."
+    gemspec.email = "github@squareup.com"
+    gemspec.homepage = "http://github.com/square/rack-geo"
+    gemspec.authors = [
+      "Randy Reddig",
+      "Cameron Walters",
+      "Paul McKellar",
+    ]
+    gemspec.extra_rdoc_files = [
+      'README.rdoc',
+      'HISTORY.rdoc',
+      'LICENSE.txt',
+    ]
+    gemspec.add_dependency              "rack",         ">=1.0.0"
+    gemspec.add_development_dependency  "rack-test",    ">=0.5.3"
+    gemspec.add_development_dependency  "rspec",        ">=1.3.0"
+  end
+rescue LoadError
+  puts "Jeweler (or a dependency) not available. Install it with: gem install jeweler"
+end
+
+desc "Run all specs"
+Spec::Rake::SpecTask.new do |t|
+  t.spec_opts = ["--options", "spec/spec.opts"]
+  t.spec_files = FileList["spec/**/*_spec.rb"]
+  t.rcov = ENV["RCOV"]
+  t.rcov_opts = %w{--exclude osx\/objc,gems\/,spec\/}
+  t.verbose = true
+end
+
+task :spec => :check_dependencies
+task :default => :spec
+
+desc "Remove trailing whitespace"
+task :whitespace do
+  sh %{find . -name '*.rb' -exec sed -i '' 's/ *$//g' {} \\;}
+end

lib/rack-geo.rb

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+require 'rack/geo'

lib/rack/geo.rb

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+require 'rack/geo/version'
+
+module Rack
+  class Geo
+    def initialize(app)
+      @app = app
+    end
+
+    def call(env)
+      position = Position.new(env["HTTP_GEO_POSITION"] || env["HTTP_X_GEO_POSITION"])
+      env["geo.position"] = position if position.valid?
+      @app.call(env)
+    end
+
+    class Position
+      attr_accessor :latitude, :longitude, :altitude, :uncertainty, :heading, :speed
+
+      def initialize(value=nil)
+        parse! value
+      end
+
+      MATCH_LLA = /\A([+-]?[0-9\.]+);([+-]?[0-9\.]+)(?:;([+-]?[0-9\.]+))?/.freeze
+      MATCH_EPU = /\sepu=([0-9\.]+)(?:\s|\z)/i.freeze
+      MATCH_HDN = /\shdn=([0-9\.]+)(?:\s|\z)/i.freeze
+      MATCH_SPD = /\sspd=([0-9\.]+)(?:\s|\z)/i.freeze
+
+      def parse!(value)
+        reset!
+        value = value.to_s.strip
+
+        if lla = MATCH_LLA.match(value)
+          @latitude = lla[1].to_f
+          @longitude = lla[2].to_f
+          @altitude = lla[3].to_f if lla[3]
+        end
+
+        if epu = MATCH_EPU.match(value)
+          @uncertainty = epu[1].to_f
+        end
+
+        if hdn = MATCH_HDN.match(value)
+          @heading = hdn[1].to_f
+        end
+
+        if spd = MATCH_SPD.match(value)
+          @speed = spd[1].to_f
+        end
+
+        nil
+      end
+
+      def valid?
+        (!latitude.nil? && latitude.respond_to?(:to_f) && (-90..90).include?(latitude.to_f)) &&
+        (!longitude.nil? && longitude.respond_to?(:to_f) && (-180..180).include?(longitude.to_f)) &&
+        (altitude.nil? || altitude.respond_to?(:to_f)) &&
+        (uncertainty.nil? || uncertainty.respond_to?(:to_f) && uncertainty.to_f >= 0) &&
+        (heading.nil? || heading.respond_to?(:to_f) && (0..360).include?(heading.to_f)) &&
+        (speed.nil? || speed.respond_to?(:to_f) && speed.to_f >= 0)
+      end
+
+      def attributes
+        {
+          :latitude => latitude,
+          :longitude => longitude,
+          :altitude => altitude,
+          :uncertainty => uncertainty,
+          :heading => heading,
+          :speed => speed,
+        }
+      end
+
+      def to_http_header
+        value = "%f;%f" % [latitude.to_f, longitude.to_f]
+        value += ";%f" % altitude.to_f if altitude
+        value += " epu=%f" % uncertainty.to_f if uncertainty
+        value += " hdn=%f" % heading.to_f if heading
+        value += " spd=%f" % speed.to_f if speed
+        value
+      end
+
+      def self.from_http_header(value)
+        self.new(value)
+      end
+
+      private
+
+      def reset!
+        @latitude = @longitude = @altitude = @uncertainty = @heading = @speed = nil
+      end
+    end
+  end
+end

lib/rack/geo/version.rb

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+module Rack
+  class Geo
+    module VERSION #:nodoc:
+      MAJOR = 0
+      MINOR = 1
+      TINY  = 0
+
+      STRING = [MAJOR, MINOR, TINY].join('.')
+    end
+  end
+end