feat(updater): 添加Github更新检查模块，方便获取基于Github发布的插件版本更新。

extension/updater/pom.xml

@@ -0,0 +1,34 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>easyplugin-parent</artifactId>
+        <groupId>cc.carm.lib</groupId>
+        <version>1.4.7</version>
+        <relativePath>../../pom.xml</relativePath>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+    <properties>
+        <maven.compiler.source>${project.jdk.version}</maven.compiler.source>
+        <maven.compiler.target>${project.jdk.version}</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <maven.compiler.encoding>UTF-8</maven.compiler.encoding>
+    </properties>
+    <artifactId>easyplugin-updatechecker</artifactId>
+    <packaging>jar</packaging>
+
+    <name>EasyPlugin-UpdateChecker</name>
+
+    <dependencies>
+
+        <dependency>
+            <groupId>cc.carm.lib</groupId>
+            <artifactId>githubreleases4j</artifactId>
+            <scope>compile</scope>
+        </dependency>
+
+    </dependencies>
+
+
+</project>

extension/updater/src/main/java/cc/carm/lib/easyplugin/updatechecker/GHUpdateChecker.java

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+package cc.carm.lib.easyplugin.updatechecker;
+
+import cc.carm.lib.githubreleases4j.GithubReleases4J;
+import org.bukkit.plugin.Plugin;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.List;
+import java.util.logging.Logger;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+public class GHUpdateChecker {
+
+    protected static final @NotNull Pattern GH_URL_PATTERN = Pattern.compile("^https?://github.com/([A-Za-z\\d-_]+)/([^/]*?)/?");
+
+    public static @NotNull GHUpdateChecker of(@NotNull Logger logger, @NotNull String owner, @NotNull String repo) {
+        return new GHUpdateChecker(logger, owner, repo);
+    }
+
+    public static @NotNull GHUpdateChecker of(@NotNull Plugin plugin) {
+        return new GHUpdateChecker(plugin.getLogger(), getGithubOwner(plugin), plugin.getName());
+    }
+
+    public static @NotNull Runnable runner(@NotNull Plugin plugin) {
+        return of(plugin).runner(plugin.getDescription().getVersion());
+    }
+
+    protected final @NotNull Logger logger;
+    protected final @NotNull String owner;
+    protected final @NotNull String repo;
+
+    public GHUpdateChecker(@NotNull Logger logger, @NotNull String owner, @NotNull String repo) {
+        this.logger = logger;
+        this.owner = owner;
+        this.repo = repo;
+    }
+
+    public void checkUpdate(@NotNull String currentVersion) {
+        Integer behindVersions = GithubReleases4J.getVersionBehind(owner, repo, currentVersion);
+        String downloadURL = GithubReleases4J.getReleasesURL(owner, repo);
+
+        if (behindVersions == null) {
+            this.logger.severe("检查更新失败，请您定期查看插件是否更新，避免安全问题。");
+            this.logger.severe("下载地址 " + downloadURL);
+        } else if (behindVersions == 0) {
+            this.logger.info("检查完成，当前已是最新版本。");
+        } else if (behindVersions > 0) {
+            this.logger.info("发现新版本! 目前已落后 " + behindVersions + " 个版本。");
+            this.logger.info("最新版下载地址 " + downloadURL);
+        } else {
+            this.logger.severe("检查更新失败! 当前版本未知，请您使用原生版本以避免安全问题。");
+            this.logger.severe("最新版下载地址 " + downloadURL);
+        }
+    }
+
+    public Runnable runner(@NotNull String currentVersion) {
+        return () -> checkUpdate(currentVersion);
+    }
+
+    protected static String getGithubOwner(Plugin plugin) {
+        // 首先，尝试从插件提供的网址中获取OWNER
+        String websiteOwner = getGithubOwner(plugin.getDescription().getWebsite());
+        if (websiteOwner != null && !websiteOwner.isEmpty()) return websiteOwner;
+
+        // 如果插件提供的网址中没有，则尝试获取插件的首位作者名
+        List<String> authors = plugin.getDescription().getAuthors();
+        if (!authors.isEmpty()) return authors.get(0);
+
+        // 再没有的话只能返回插件的名称了
+        return plugin.getName();
+    }
+
+    protected static String getGithubOwner(String url) {
+        Matcher matcher = GH_URL_PATTERN.matcher(url);
+        return matcher.find() ? matcher.group(1) : null;
+    }
+
+}

extension/updater/src/test/java/cc/carm/lib/easyplugin/updatechecker/RegexTest.java

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+package cc.carm.lib.easyplugin.updatechecker;
+
+import org.junit.Test;
+
+public class RegexTest {
+
+
+    @Test
+    public void onTest() {
+        System.out.println(GHUpdateChecker.getGithubOwner("https://github.com/CarmJos/EasyPlugin"));
+        System.out.println(GHUpdateChecker.getGithubOwner("https://github.com/Ghost-chu/QuickShop-Hikari/pulls"));
+        System.out.println(GHUpdateChecker.getGithubOwner("https://github.com/QWQ123/QuickShop"));
+
+    }
+
+}