Add support for specifying a separate Github base URL

When using GH:E, api.github.com will not be the endpoint used to handle
PRs and issues. We can specify it in the environment to handle that case
better.

Author: gdiggs

lib/cc/services/github_issues.rb

@@ -17,7 +17,7 @@ class Config < CC::Service::Config
   self.description = "Open issues on GitHub"
   self.issue_tracker = true
 
-  BASE_URL = "https://api.github.com"
+  DEFAULT_BASE_URL = "https://api.github.com".freeze
 
   def receive_test
     result = create_issue("Test ticket from Code Climate", "")
@@ -55,6 +55,10 @@ def receive_issue
 
 private
 
+  def base_url
+    ENV["CODECLIMATE_GITHUB_API_URL"] || DEFAULT_BASE_URL
+  end
+
   def create_issue(title, issue_body)
     params = { title: title, body: issue_body }
 
@@ -66,7 +70,7 @@ def create_issue(title, issue_body)
     http.headers["Authorization"] = "token #{config.oauth_token}"
     http.headers["User-Agent"] = "Code Climate"
 
-    url = "#{BASE_URL}/repos/#{config.project}/issues"
+    url = "#{base_url}/repos/#{config.project}/issues"
     service_post(url, params.to_json) do |response|
       body = JSON.parse(response.body)
       {

lib/cc/services/github_pull_requests.rb

@@ -18,7 +18,7 @@ class Config < CC::Service::Config
   self.title = "GitHub Pull Requests"
   self.description = "Update pull requests on GitHub"
 
-  BASE_URL = "https://api.github.com"
+  DEFAULT_BASE_URL = "https://api.github.com".freeze
   BODY_REGEX = %r{<b>Code Climate</b> has <a href=".*">analyzed this pull request</a>}
   COMMENT_BODY = '<img src="https://codeclimate.com/favicon.png" width="20" height="20" />&nbsp;<b>Code Climate</b> has <a href="%s">analyzed this pull request</a>.'
   MESSAGES = [
@@ -175,20 +175,24 @@ def setup_http
     http.headers["User-Agent"]    = "Code Climate"
   end
 
+  def base_url
+    ENV["CODECLIMATE_GITHUB_API_URL"] || DEFAULT_BASE_URL
+  end
+
   def status_url
     base_status_url(commit_sha)
   end
 
   def base_status_url(commit_sha)
-    "#{BASE_URL}/repos/#{github_slug}/statuses/#{commit_sha}"
+    "#{base_url}/repos/#{github_slug}/statuses/#{commit_sha}"
   end
 
   def comments_url
-    "#{BASE_URL}/repos/#{github_slug}/issues/#{number}/comments"
+    "#{base_url}/repos/#{github_slug}/issues/#{number}/comments"
   end
 
   def user_url
-    "#{BASE_URL}/user"
+    "#{base_url}/user"
   end
 
   def github_slug

test/github_issues_test.rb

@@ -60,6 +60,22 @@ def test_receive_test
     assert_equal "Issue <a href='http://foo.bar'>#2</a> created.", response[:message]
   end
 
+  def test_different_base_url
+    old_base = ENV["CODECLIMATE_GITHUB_API_URL"]
+    ENV["CODECLIMATE_GITHUB_API_URL"] = "http://example.com"
+
+    @stubs.post request_url do |env|
+      assert env[:url].to_s == "http://example.com/#{request_url}"
+      [200, {}, '{"number": 2, "html_url": "http://foo.bar"}']
+    end
+
+    response = receive_event(name: "test")
+
+    assert_equal "Issue <a href='http://foo.bar'>#2</a> created.", response[:message]
+  ensure
+    ENV["CODECLIMATE_GITHUB_API_URL"] = old_base
+  end
+
   private
 
   def project

test/github_pull_requests_test.rb

@@ -244,6 +244,20 @@ def test_pull_request_nothing_happened
     assert_equal({ ok: false, message: "Nothing happened" }, response)
   end
 
+  def test_different_base_url
+    old_base = ENV["CODECLIMATE_GITHUB_API_URL"]
+    ENV["CODECLIMATE_GITHUB_API_URL"] = "http://example.com"
+
+    @stubs.get("/user") do |env|
+      assert env[:url].to_s == "http://example.com/user"
+      [200, { "x-oauth-scopes" => "gist, user, repo" }, ""]
+    end
+
+    assert receive_test({ add_comment: true })[:ok], "Expected test of pull request to be true"
+  ensure
+    ENV["CODECLIMATE_GITHUB_API_URL"] = old_base
+  end
+
 private
 
   def expect_status_update(repo, commit_sha, params)