Add GitHub network adapter

lib/github.rb

@@ -0,0 +1,42 @@
+require "json"
+require "net/http"
+require "uri"
+
+module GitHub
+  # Very simple Net::HTTP based network adapter that POSTs requests to the
+  # GitHub GraphQL endpoint.
+  #
+  # A production application would likely use a more sophisticated network
+  # stack. Maybe something like the Faraday (https://github.com/lostisland/faraday)
+  # gem.
+  class HTTPAdapter
+    QUERY_URI = ::URI.parse("https://api.github.com/graphql")
+
+    # Public: Make GraphQL network request.
+    #
+    # document - A parsed GraphQL::Language::Nodes::Document object of the query
+    #            string.
+    # variables - A Hash of variables to use while executing the document
+    #             operation.
+    # context - A Hash of application specific context information passed to
+    #           the query method. The context object is a great place for
+    #           OAuth tokens to be passed along.
+    #
+    # Returns a Hash GraphQL response, { "data" => ..., "errors" => ... }.
+    def self.call(document, variables, context)
+      http = Net::HTTP.new(QUERY_URI.host, QUERY_URI.port)
+      http.use_ssl = true
+
+      request = Net::HTTP::Post.new(QUERY_URI.request_uri)
+      request["Authorization"] = "Bearer #{context[:access_token]}" if context[:access_token]
+
+      request.body = JSON.generate({
+        "query" => document.to_query_string,
+        "variables" => JSON.generate(variables)
+      })
+
+      response = http.request(request)
+      JSON.parse(response.body)
+    end
+  end
+end