Initial commit. Everything appears to be working.

.editorconfig

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+root = true
+
+[*.cr]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+indent_style = space
+indent_size = 2
+trim_trailing_whitespace = true

.gitignore

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+/docs/
+/lib/
+/bin/
+/.shards/
+*.dwarf
+
+# Libraries don't need dependency lock
+# Dependencies will be locked in applications that use them
+/shard.lock

.travis.yml

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+language: crystal
+
+# Uncomment the following if you'd like Travis to run specs and check code formatting
+# script:
+#   - crystal spec
+#   - crystal tool format --check

LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2019 Chris Watson
+
+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.md

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+# opengraph.cr
+
+Crystal implementation of the [Open Graph](http://ogp.me) protocol, allowing you to parse Open Graph meta tags and extract valuable information.
+
+## Installation
+
+1. Add the dependency to your `shard.yml`:
+
+   ```yaml
+   dependencies:
+     opengraph:
+       github: watzon/opengraph.cr
+   ```
+
+2. Run `shards install`
+
+## Usage
+
+```crystal
+require "opengraph"
+
+og = OpenGraph.from_url("css-tricks.com")
+# og = OpenGraph.parse("<!-- RAW HTML -->")
+
+puts og.website?
+# => true
+
+puts og["title"]?
+# => "CSS-Tricks"
+
+puts og["image"]?
+# => "https://css-tricks.com/wp-content/uploads/2014/03/css-tricks-star.png"
+```
+
+TODO: Write usage instructions here
+
+## Development
+
+TODO: Write development instructions here
+
+## Contributing
+
+1. Fork it (<https://github.com/watzon/opengraph/fork>)
+2. Create your feature branch (`git checkout -b my-new-feature`)
+3. Commit your changes (`git commit -am 'Add some feature'`)
+4. Push to the branch (`git push origin my-new-feature`)
+5. Create a new Pull Request
+
+## Contributors
+
+- [Chris Watson](https://github.com/watzon) - creator and maintainer

shard.yml

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+name: opengraph
+version: 0.1.0
+
+authors:
+  - Chris Watson <[email protected]>
+
+crystal: 0.28.0
+
+license: MIT
+
+dependencies:
+  crystagiri:
+    github: madeindjs/crystagiri

spec/opengraph_spec.cr

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+require "./spec_helper"
+
+describe Opengraph do
+  # TODO: Write tests
+
+  it "works" do
+    false.should eq(true)
+  end
+end

spec/spec_helper.cr

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+require "spec"
+require "../src/opengraph"

src/opengraph.cr

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+require "http/client"
+require "crystagiri"
+require "./opengraph/version"
+require "./opengraph/object"
+
+# TODO: Write documentation for `Opengraph`
+module OpenGraph
+  extend self
+
+  # Fetch Open Graph data from the specified `url`. Makes an
+  # HTTP GET request and returns an `OpenGraph::Object`
+  # or nil if the URL was not found.
+  def self.from_url(url)
+    res = HTTP::Client.get(url)
+
+    # Check for redirects
+    if (300..303).includes?(res.status_code) && res.headers["Location"]?
+      location = res.headers["Location"].to_s
+      return self.from_url(location)
+    end
+
+    self.parse(res.body)
+  end
+
+  # Parse raw `html` either from a string or an `XML::Node`
+  # and return an `OpenGraph::Object`.
+  def self.parse(html, strict = true)
+    doc = Crystagiri::HTML.new(html)
+    page = OpenGraph::Object.new
+    doc.css("meta") do |m|
+      attributes = m.node.attributes
+      if attributes["property"]? && attributes["property"].to_s.match(/["']og:(.+)['"]/i)
+        prop = $1.gsub("-", "_")
+        content = attributes["content"].to_s
+        if value = content.match(/["'](.+)['"]/i)
+          page[prop] = value[1].strip
+        end
+      end
+    end
+    page
+  end
+end

src/opengraph/object.cr

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+module OpenGraph
+  class Object < Hash(String, String)
+    MANDATORY_ATTRIBUTES = %w(title type image url)
+
+    TYPES = {
+      "activity"     => %w(activity sport),
+      "business"     => %w(bar company cafe hotel restaurant),
+      "group"        => %w(cause sports_league sports_team),
+      "organization" => %w(band government non_profit school university),
+      "person"       => %w(actor athlete author director musician politician public_figure),
+      "place"        => %w(city country landmark state_province),
+      "product"      => %w(album book drink food game movie product song tv_show),
+      "website"      => %w(blog website),
+    }
+
+    def initialize
+      super
+    end
+
+    def type
+      self["type"]?
+    end
+
+    def schema
+      TYPES.each_pair do |schema, types|
+        return schema if types.includes?(self.type.to_s)
+      end
+      nil
+    end
+
+    {% for type in TYPES.values.reduce { |acc, i| acc + i } %}
+      def {{type.id}}?
+        self.type == {{type}}
+      rescue
+        nil
+      end
+
+      def {{type.id}}
+        self.type == {{type}}
+      end
+    {% end %}
+
+    {% for scheme in TYPES.keys %}
+      def {{scheme.id}}?
+        self.type == {{scheme}} || TYPES[{{scheme}}].includes?(self.type)
+      end
+
+      def {{scheme.id}}
+        self.type == {{scheme}} || TYPES[{{scheme}}].includes?(self.type)
+      rescue
+        nil
+      end
+    {% end %}
+
+    def valid?
+      MANDATORY_ATTRIBUTES.each { |a| return false unless self[a]? }
+      true
+    end
+  end
+end

src/opengraph/version.cr

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+module OpenGraph
+  VERSION = "0.1.0"
+end