Revert "[JENKINS-71849] Allow NoThrottle to be used even on github.com (#653)" (#730)

This reverts commit 51d5810.

Author: car-roll

src/main/java/org/jenkinsci/plugins/github_branch_source/ApiRateLimitChecker.java

@@ -100,13 +100,22 @@ long checkRateLimitImpl(@NonNull GHRateLimit.Record rateLimit, long count, long
     NoThrottle(Messages.ApiRateLimitChecker_NoThrottle()) {
         @Override
         public LocalChecker getChecker(@NonNull TaskListener listener, String apiUrl) {
-            return new LocalChecker(listener) {
-                @Override
-                long checkRateLimitImpl(@NonNull GHRateLimit.Record rateLimit, long count, long now)
-                        throws InterruptedException {
-                    return now;
-                }
-            };
+            if (GitHubServerConfig.GITHUB_URL.equals(apiUrl)) {
+                // If the GitHub public API is being used, this will fallback to ThrottleOnOver
+                LocalChecker checker = ThrottleOnOver.getChecker(listener, apiUrl);
+                checker.writeLog(
+                        "GitHub throttling is disabled, which is not allowed for public GitHub usage, "
+                                + "so ThrottleOnOver will be used instead. To configure a different rate limiting strategy, go to \"GitHub API usage\" under \"Configure System\" in the Jenkins settings.");
+                return checker;
+            } else {
+                return new LocalChecker(listener) {
+                    @Override
+                    long checkRateLimitImpl(@NonNull GHRateLimit.Record rateLimit, long count, long now)
+                            throws InterruptedException {
+                        return now;
+                    }
+                };
+            }
         }
     };
 

src/test/java/org/jenkinsci/plugins/github_branch_source/ApiRateLimitCheckerTest.java

@@ -27,7 +27,6 @@
 import org.jenkinsci.plugins.github.config.GitHubServerConfig;
 import org.junit.After;
 import org.junit.Before;
-import org.junit.Ignore;
 import org.junit.Test;
 import org.kohsuke.github.GHRateLimit;
 import org.kohsuke.github.GitHub;
@@ -160,7 +159,6 @@ private void setupStubs(List<RateLimit> scenarios) throws Exception {
         assertEquals(2, initialRequestCount);
     }
 
-    @Ignore("behavior deliberately modified")
     @Test
     public void NoCheckerConfigured() throws Exception {
         // set up scenarios
@@ -351,7 +349,6 @@ public void NoThrottleTestShouldNotThrottle404() throws Exception {
      *
      * @author Marc Salles Navarro
      */
-    @Ignore("behavior deliberately modified")
     @Test
     public void NoThrottleTestShouldFallbackToThrottleOnOverForGitHubDotCom() throws Exception {
         GitHubConfiguration.get().setApiRateLimitChecker(ApiRateLimitChecker.ThrottleOnOver);