1 files changed, 126 insertions, 0 deletions
diff --git a/lib/bundler/remote_specification.rb b/lib/bundler/remote_specification.rb
new file mode 100644
index 0000000000..dcaaf6af2e
--- /dev/null
+++ b/lib/bundler/remote_specification.rb
@@ -0,0 +1,126 @@
+# frozen_string_literal: true
+
+module Bundler
+  # Represents a lazily loaded gem specification, where the full specification
+  # is on the source server in rubygems' "quick" index. The proxy object is to
+  # be seeded with what we're given from the source's abbreviated index - the
+  # full specification will only be fetched when necessary.
+  class RemoteSpecification
+    include MatchRemoteMetadata
+    include MatchPlatform
+    include Comparable
+
+    attr_reader :name, :version, :platform
+    attr_writer :dependencies
+    attr_accessor :source, :remote, :locked_platform, :created_at
+
+    def initialize(name, version, platform, spec_fetcher)
+      @name         = name
+      @version      = Gem::Version.create version
+      @original_platform = platform || Gem::Platform::RUBY
+      @platform     = Gem::Platform.new(platform)
+      @spec_fetcher = spec_fetcher
+      @dependencies = nil
+      @locked_platform = nil
+    end
+
+    def insecurely_materialized?
+      @locked_platform.to_s != @platform.to_s
+    end
+
+    # Needed before installs, since the arch matters then and quick
+    # specs don't bother to include the arch in the platform string
+    def fetch_platform
+      @platform = _remote_specification.platform
+    end
+
+    def full_name
+      @full_name ||= if @platform == Gem::Platform::RUBY
+        "#{@name}-#{@version}"
+      else
+        "#{@name}-#{@version}-#{@platform}"
+      end
+    end
+
+    # Compare this specification against another object. Using sort_obj
+    # is compatible with Gem::Specification and other Bundler or RubyGems
+    # objects. Otherwise, use the default Object comparison.
+    def <=>(other)
+      if other.respond_to?(:sort_obj)
+        sort_obj <=> other.sort_obj
+      else
+        super
+      end
+    end
+
+    # Because Rubyforge cannot be trusted to provide valid specifications
+    # once the remote gem is downloaded, the backend specification will
+    # be swapped out.
+    def __swap__(spec)
+      raise APIResponseInvalidDependenciesError unless spec.dependencies.all? {|d| d.is_a?(Gem::Dependency) }
+
+      SharedHelpers.ensure_same_dependencies(self, dependencies, spec.dependencies)
+      @_remote_specification = spec
+    end
+
+    # Create a delegate used for sorting. This strategy is copied from
+    # RubyGems 2.23 and ensures that Bundler's specifications can be
+    # compared and sorted with RubyGems' own specifications.
+    #
+    # @see #<=>
+    # @see Gem::Specification#sort_obj
+    #
+    # @return [Array] an object you can use to compare and sort this
+    #   specification against other specifications
+    def sort_obj
+      [@name, @version, @platform == Gem::Platform::RUBY ? -1 : 1]
+    end
+
+    def to_s
+      "#<#{self.class} name=#{name} version=#{version} platform=#{platform}>"
+    end
+
+    def dependencies
+      @dependencies ||= begin
+        deps = method_missing(:dependencies)
+
+        # allow us to handle when the specs dependencies are an array of array of string
+        # in order to delay the crash to `#__swap__` where it results in a friendlier error
+        # see https://github.com/rubygems/bundler/issues/5797
+        deps = deps.map {|d| d.is_a?(Gem::Dependency) ? d : Gem::Dependency.new(*d) }
+
+        deps
+      end
+    end
+
+    def runtime_dependencies
+      dependencies.select(&:runtime?)
+    end
+
+    def git_version
+      return unless loaded_from && source.is_a?(Bundler::Source::Git)
+      " #{source.revision[0..6]}"
+    end
+
+    private
+
+    def to_ary
+      nil
+    end
+
+    def _remote_specification
+      @_remote_specification ||= @spec_fetcher.fetch_spec([@name, @version, @original_platform])
+      @_remote_specification || raise(GemspecError, "Gemspec data for #{full_name} was" \
+        " missing from the server!")
+    end
+
+    def method_missing(method, *args, &blk)
+      _remote_specification.send(method, *args, &blk)
+    end
+
+    def respond_to?(method, include_all = false)
+      super || _remote_specification.respond_to?(method, include_all)
+    end
+    public :respond_to?
+  end
+end