What's difference from "requireNoRepositories"?

The purpose for "requireNoRepositories" is: Detect whether pom and pom’s parents contains repositories definition. That guide users to use correct convention (not define repositories in pom files). So it only analyze current pom and its parent pom files.

But “BannedRepositories” is different purpose, it’s just like “BannedDependencies”. It will detect banned repositories from maven session context instead of only pom.xml and parents. It's trying to avoid misuse incorrect repositories. It will detect banned repositories from current maven session context.

Support Parameters

• banRepositories - Specify banned non-plugin repositories. This is a black list of http/https url patterns.
• banPluginRepositories - Specify banned plugin repositories. This is a black list of http/https url patterns.
• allowedRepositories - Specify explicitly allowed non-plugin repositories. This is a white list of http/https url patterns.
• allowedPluginRepositories - Specify explicitly allowed plugin repositories. This is a white list of http/https url patternes.

Sample Configuration

For example, one company want to limit repositories usage. But different developers might use different settings.xml. Even their projects' pom defined different repositories too. For this case, could leverage this enforcer rule to banned specified repositories or even use allowedRepositories/allowedPluginRepositories to banned others unexpected repositories.

Ex. http://repo1/xyz is the repository that want to be banned. http://repo2/xyz is the repository that want to use now.

Sample Plugin Configuration:

<project>
  [...]
  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-enforcer-plugin</artifactId>
        <version>3.5.0</version>
        <executions>
          <execution>
            <id>enforce-banned-repositories</id>
            <goals>
              <goal>enforce</goal>
            </goals>
            <configuration>
              <rules>
                <bannedRepositories>
                  <bannedRepositories>
                    <bannedRepository>http://repo1/*</bannedRepository>
                  </bannedRepositories>
                  <bannedPluginRepositories>
                    <bannedPluginRepository>http://repo1/*</bannedPluginRepository>
                  </bannedPluginRepositories>
                                  
                  <!-- for some cases, white list is more effective -->
                  <!--
                                  
                  <allowedRepositories>
                    <allowedRepository>http://repo2/*</allowedRepository>
                  </allowedRepositories>
                  <allowedPluginRepositories>
                    <allowedPluginRepository>http://repo2/*</allowedPluginRepository>
                  </allowedPluginRepositories>
                                  
                  -->
                </bannedRepositories>
              </rules>
            </configuration>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>
  [...]
</project>

Worth to Note

• http/https url patterns support wildcard "*"
• This rule will detect banned repositories on maven session itself instead of pom or settings, so if users defined "mirrorOf" in settings.xml, even defined banned repositories in pom.xml, it won't be detected.

          <mirrors>
           <mirror>
             <id>nexus</id>
             <mirrorOf>*</mirrorOf>
             <url>http://.../nexus/..</url>
           </mirror>
          </mirrors>