How to config mirrors for repositories in Gradle without changing the source code of your project?

init.gradle.kts

fun RepositoryHandler.enableMirror() {
    all {
        if (this is MavenArtifactRepository) {
            val originalUrl = this.url.toString().removeSuffix("/")
            urlMappings[originalUrl]?.let {
                logger.lifecycle("Repository[$url] is mirrored to $it")
                this.setUrl(it)
            }
        }
    }
}

val urlMappings = mapOf(
    "https://repo.maven.apache.org/maven2" to "https://mirrors.tencent.com/nexus/repository/maven-public/",
    "https://dl.google.com/dl/android/maven2" to "https://mirrors.tencent.com/nexus/repository/maven-public/",
    "https://plugins.gradle.org/m2" to "https://mirrors.tencent.com/nexus/repository/gradle-plugins/"
)

gradle.allprojects {
    buildscript {
        repositories.enableMirror()
    }
    repositories.enableMirror()
}

gradle.beforeSettings { 
    pluginManagement.repositories.enableMirror()
    dependencyResolutionManagement.repositories.enableMirror()
}

Gradle 低于6.8 没有 dependencyResolutionManagement 相关的 API，旧项目有兼容问题。 注释了好像影响不大🙊

对，这个 API 出现的比较晚，现在新版本比较推荐使用这个 api 直接配置整个项目的工程依赖，如果没有用到也确实不会有什么实质影响。当然，理论上也可以考虑加个版本控制。

Gradle 旧版本兼容问题，我这边通过版本判断及反射读取相关字段，配置 dependencyResolutionManagement ，这样应该也可以，自己试了是生效的。

参考链接

gradle.beforeSettings {
    pluginManagement.repositories.enableMirror()
    // 6.8 及更高版本执行 DependencyResolutionManagement 配置
    if (gradle.gradleVersion >= "6.8") {
        val getDrm = settings.javaClass.getDeclaredMethod("getDependencyResolutionManagement")
        val drm = getDrm.invoke(settings)
        val getRepos = drm.javaClass.getDeclaredMethod("getRepositories")
        val repos = getRepos.invoke(drm) as RepositoryHandler
        repos.enableMirror()
        println("Gradle ${gradle.gradleVersion} DependencyResolutionManagement Configured $settings")
    } else {
        println("Gradle ${gradle.gradleVersion} DependencyResolutionManagement Ignored $settings")
    }
}

运行结果

6.8 及以上

Gradle 8.0 DependencyResolutionManagement Configured settings 'Jetpack'
Repository Google [https://dl.google.com/dl/android/maven2/] is mirrored to https://mirrors.tencent.com/nexus/repository/maven-public/
Repository MavenRepo [https://repo.maven.apache.org/maven2/] is mirrored to https://mirrors.tencent.com/nexus/repository/maven-public/
Repository Gradle Central Plugin Repository [https://plugins.gradle.org/m2] is mirrored to https://mirrors.tencent.com/nexus/repository/gradle-plugins/
Repository Google [https://dl.google.com/dl/android/maven2/] is mirrored to https://mirrors.tencent.com/nexus/repository/maven-public/
Repository MavenRepo [https://repo.maven.apache.org/maven2/] is mirrored to https://mirrors.tencent.com/nexus/repository/maven-public/
...

6.8 以下

Gradle 6.1.1 DependencyResolutionManagement Ignored settings 'DemoApp'

> Configure project :
Repository Google [https://dl.google.com/dl/android/maven2/] is mirrored to https://mirrors.tencent.com/nexus/repository/maven-public/
Repository MavenRepo [https://repo.maven.apache.org/maven2/] is mirrored to https://mirrors.tencent.com/nexus/repository/maven-public/
Repository maven6 [https://plugins.gradle.org/m2/] is mirrored to https://mirrors.tencent.com/nexus/repository/gradle-plugins/
...