By default, try to extract credentials from the environment

README.md

@@ -77,21 +77,21 @@ this method returned an array of `Twitter::Status` objects, which is now
 accessible by sending the `results` message to a `Twitter::SearchResults`
 object.
 
-    # Version 2
+##### Version 2
     Twitter::Client.search("query").each do |status|
       puts status.full_text
     end
 
-    # Version 3
+##### Version 3
     Twitter::Client.search("query").results.each do |status|
       puts status.full_text
     end
 
 The `Twitter::Status#expanded_urls` method has been removed. Use
 `Twitter::Status#urls` instead.
 
-Support for API proxies via `gateway` configuration has been removed. This
-still be implemented by inserting custom Faraday middleware.
+Support for API gateways via `gateway` configuration has been removed. This
+may still be implemented by inserting custom Faraday middleware.
 
 The `Twitter::Error::EnhanceYourCalm` class has been removed, since all Search
 API requests are made via api.twitter.com, which does not return HTTP 420. When

lib/twitter/config.rb

@@ -11,10 +11,10 @@ module Config
     DEFAULT_CONNECTION_OPTIONS = {}
 
     # The consumer key if none is set
-    DEFAULT_CONSUMER_KEY = nil
+    DEFAULT_CONSUMER_KEY = ENV['TWITTER_CONSUMER_KEY']
 
     # The consumer secret if none is set
-    DEFAULT_CONSUMER_SECRET = nil
+    DEFAULT_CONSUMER_SECRET = ENV['TWITTER_CONSUMER_SECRET']
 
     # The endpoint that will be used to connect if none is set
     #
@@ -29,10 +29,10 @@ module Config
     DEFAULT_MEDIA_ENDPOINT = 'https://upload.twitter.com'
 
     # The oauth token if none is set
-    DEFAULT_OAUTH_TOKEN = nil
+    DEFAULT_OAUTH_TOKEN = ENV['TWITTER_OAUTH_TOKEN']
 
     # The oauth token secret if none is set
-    DEFAULT_OAUTH_TOKEN_SECRET = nil
+    DEFAULT_OAUTH_TOKEN_SECRET = ENV['TWITTER_OAUTH_TOKEN_SECRET']
 
     # The proxy server if none is set
     DEFAULT_PROXY = nil