Add maven updater

4 files changed, 75 insertions, 3 deletions

diff --git a/src/main/java/moe/nea/libautoupdate/CurrentVersion.java b/src/main/java/moe/nea/libautoupdate/CurrentVersion.java
index eb8fc8a..b684ffa 100644
--- a/src/main/java/moe/nea/libautoupdate/CurrentVersion.java
+++ b/src/main/java/moe/nea/libautoupdate/CurrentVersion.java
@@ -36,7 +36,8 @@ public interface CurrentVersion {
     }
 
     /**
-     * Create a {@link CurrentVersion} that uses git tag names. Any difference in tag name will be treated as newer.
+     * Create a {@link CurrentVersion} that uses string tag names. Any difference in tag name will treat the current
+     * version as outdated..
      *
      * @param tagName the current tag name
      */
diff --git a/src/main/java/moe/nea/libautoupdate/Main.java b/src/main/java/moe/nea/libautoupdate/Main.java
index 3043348..de91b08 100644
--- a/src/main/java/moe/nea/libautoupdate/Main.java
+++ b/src/main/java/moe/nea/libautoupdate/Main.java
@@ -4,9 +4,9 @@ public class Main {
     public static void main(String[] args) {
 
         UpdateContext updater = new UpdateContext(
-                UpdateSource.githubUpdateSource("NotEnoughUpdates", "NotEnoughUpdates"),
+                UpdateSource.mavenSource("https://repo.nea.moe/releases", "moe.nea", "neuhax"),
                 UpdateTarget.deleteAndSaveInTheSameFolder(Main.class),
-                CurrentVersion.ofTag("v2.1.1-pre1"),
+                CurrentVersion.ofTag("1.1.0"),
                 "test"
         );
         updater.cleanup();
diff --git a/src/main/java/moe/nea/libautoupdate/MavenSource.java b/src/main/java/moe/nea/libautoupdate/MavenSource.java
new file mode 100644
index 0000000..102e8c7
--- /dev/null
+++ b/src/main/java/moe/nea/libautoupdate/MavenSource.java
@@ -0,0 +1,64 @@
+package moe.nea.libautoupdate;
+
+import com.google.gson.JsonPrimitive;
+import lombok.*;
+import org.w3c.dom.Element;
+import org.xml.sax.InputSource;
+
+import javax.xml.XMLConstants;
+import javax.xml.parsers.DocumentBuilderFactory;
+import java.net.URL;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.CompletionException;
+
+/**
+ * Download source for a maven artifact. Pulls from the maven-metadata versioning info and does not support SNAPSHOT
+ * versions.
+ */
+@Value
+@EqualsAndHashCode(callSuper = false)
+@NonNull
+public class MavenSource implements UpdateSource {
+    String repoUrl;
+    String module;
+    String artifact;
+    String classifier;
+    String extension;
+
+    protected String getMavenBaseUrl() {
+        return String.format("%s/%s/%s", repoUrl, module.replace('.', '/'), artifact);
+    }
+
+    protected String getMavenMetadataUrl() {
+        return getMavenBaseUrl() + "/maven-metadata.xml";
+    }
+
+    protected String getMavenArtifactUrl(String version) {
+        return String.format("%s/%s/%s-%s%s%s.%s", getMavenBaseUrl(), version, artifact, version, classifier.isEmpty() ? "" : "-", classifier, extension);
+    }
+
+    @SneakyThrows
+    @Override
+    public CompletableFuture<UpdateData> checkUpdate(String updateStream) {
+        var dbf = DocumentBuilderFactory.newInstance();
+        dbf.setFeature(XMLConstants.FEATURE_SECURE_PROCESSING, true);
+        var db = dbf.newDocumentBuilder();
+        return CompletableFuture.supplyAsync(() -> {
+            try (val is = new URL(getMavenMetadataUrl()).openStream()) {
+                var document = db.parse(new InputSource(is));
+                var metadata = (Element) document.getDocumentElement();
+                var versioning = (Element) metadata.getElementsByTagName("versioning").item(0);
+                var latest = (Element) versioning.getElementsByTagName("latest").item(0);
+                var latestVersion = latest.getTextContent();
+                return new UpdateData(
+                        latestVersion,
+                        new JsonPrimitive(latestVersion),
+                        null,
+                        getMavenArtifactUrl(latestVersion)
+                );
+            } catch (Exception e) {
+                throw new CompletionException(e);
+            }
+        });
+    }
+}
diff --git a/src/main/java/moe/nea/libautoupdate/UpdateSource.java b/src/main/java/moe/nea/libautoupdate/UpdateSource.java
index 9a0e7ae..924563e 100644
--- a/src/main/java/moe/nea/libautoupdate/UpdateSource.java
+++ b/src/main/java/moe/nea/libautoupdate/UpdateSource.java
@@ -6,6 +6,13 @@ import java.util.concurrent.CompletableFuture;
  * UpdateSource is an interface to check for updates in an update stream.
  */
 public interface UpdateSource {
+    /**
+     * Create a {@link MavenSource}. Construct directly for more control
+     */
+    static MavenSource mavenSource(String repository, String moduleId, String artifactId) {
+        return new MavenSource(repository, moduleId, artifactId, "", "jar");
+    }
+
     static UpdateSource gistSource(String owner, String gistId) {
         return new GistSource(owner, gistId);
     }