feat(upstream): Add upstream proxy/cache subsystem and integrate per-protocol upstreams

ts/maven/classes.mavenregistry.ts

@@ -7,6 +7,7 @@ import { BaseRegistry } from '../core/classes.baseregistry.js';
 import type { RegistryStorage } from '../core/classes.registrystorage.js';
 import type { AuthManager } from '../core/classes.authmanager.js';
 import type { IRequestContext, IResponse, IAuthToken } from '../core/interfaces.core.js';
+import type { IProtocolUpstreamConfig } from '../upstream/interfaces.upstream.js';
 import { toBuffer } from '../core/helpers.buffer.js';
 import type { IMavenCoordinate, IMavenMetadata, IChecksums } from './interfaces.maven.js';
 import {
@@ -21,6 +22,7 @@ import {
   extractGAVFromPom,
   gavToPath,
 } from './helpers.maven.js';
+import { MavenUpstream } from './classes.mavenupstream.js';
 
 /**
  * Maven Registry class
@@ -31,18 +33,34 @@ export class MavenRegistry extends BaseRegistry {
   private authManager: AuthManager;
   private basePath: string = '/maven';
   private registryUrl: string;
+  private upstream: MavenUpstream | null = null;
 
   constructor(
     storage: RegistryStorage,
     authManager: AuthManager,
     basePath: string,
-    registryUrl: string
+    registryUrl: string,
+    upstreamConfig?: IProtocolUpstreamConfig
   ) {
     super();
     this.storage = storage;
     this.authManager = authManager;
     this.basePath = basePath;
     this.registryUrl = registryUrl;
+
+    // Initialize upstream if configured
+    if (upstreamConfig?.enabled) {
+      this.upstream = new MavenUpstream(upstreamConfig);
+    }
+  }
+
+  /**
+   * Clean up resources (timers, connections, etc.)
+   */
+  public destroy(): void {
+    if (this.upstream) {
+      this.upstream.stop();
+    }
   }
 
   public async init(): Promise<void> {
@@ -234,7 +252,23 @@ export class MavenRegistry extends BaseRegistry {
     version: string,
     filename: string
   ): Promise<IResponse> {
-    const data = await this.storage.getMavenArtifact(groupId, artifactId, version, filename);
+    let data = await this.storage.getMavenArtifact(groupId, artifactId, version, filename);
+
+    // Try upstream if not found locally
+    if (!data && this.upstream) {
+      // Parse the filename to extract extension and classifier
+      const { extension, classifier } = this.parseFilename(filename, artifactId, version);
+      if (extension) {
+        data = await this.upstream.fetchArtifact(groupId, artifactId, version, extension, classifier);
+        if (data) {
+          // Cache the artifact locally
+          await this.storage.putMavenArtifact(groupId, artifactId, version, filename, data);
+          // Generate and store checksums
+          const checksums = await calculateChecksums(data);
+          await this.storeChecksums(groupId, artifactId, version, filename, checksums);
+        }
+      }
+    }
 
     if (!data) {
       return {
@@ -462,7 +496,17 @@ export class MavenRegistry extends BaseRegistry {
   // ========================================================================
 
   private async getMetadata(groupId: string, artifactId: string): Promise<IResponse> {
-    const metadataBuffer = await this.storage.getMavenMetadata(groupId, artifactId);
+    let metadataBuffer = await this.storage.getMavenMetadata(groupId, artifactId);
+
+    // Try upstream if not found locally
+    if (!metadataBuffer && this.upstream) {
+      const upstreamMetadata = await this.upstream.fetchMetadata(groupId, artifactId);
+      if (upstreamMetadata) {
+        metadataBuffer = Buffer.from(upstreamMetadata, 'utf-8');
+        // Cache the metadata locally
+        await this.storage.putMavenMetadata(groupId, artifactId, metadataBuffer);
+      }
+    }
 
     if (!metadataBuffer) {
       // Generate empty metadata if none exists
@@ -578,4 +622,41 @@ export class MavenRegistry extends BaseRegistry {
 
     return contentTypes[extension] || 'application/octet-stream';
   }
+
+  /**
+   * Parse a Maven filename to extract extension and classifier.
+   * Filename format: {artifactId}-{version}[-{classifier}].{extension}
+   */
+  private parseFilename(
+    filename: string,
+    artifactId: string,
+    version: string
+  ): { extension: string; classifier?: string } {
+    const prefix = `${artifactId}-${version}`;
+
+    if (!filename.startsWith(prefix)) {
+      // Fallback: just get the extension
+      const lastDot = filename.lastIndexOf('.');
+      return { extension: lastDot > 0 ? filename.slice(lastDot + 1) : '' };
+    }
+
+    const remainder = filename.slice(prefix.length);
+    // remainder is either ".extension" or "-classifier.extension"
+
+    if (remainder.startsWith('.')) {
+      return { extension: remainder.slice(1) };
+    }
+
+    if (remainder.startsWith('-')) {
+      const lastDot = remainder.lastIndexOf('.');
+      if (lastDot > 1) {
+        return {
+          classifier: remainder.slice(1, lastDot),
+          extension: remainder.slice(lastDot + 1),
+        };
+      }
+    }
+
+    return { extension: '' };
+  }
 }

ts/maven/classes.mavenupstream.ts

@@ -0,0 +1,220 @@
+import * as plugins from '../plugins.js';
+import { BaseUpstream } from '../upstream/classes.baseupstream.js';
+import type {
+  IProtocolUpstreamConfig,
+  IUpstreamFetchContext,
+  IUpstreamRegistryConfig,
+} from '../upstream/interfaces.upstream.js';
+import type { IMavenCoordinate } from './interfaces.maven.js';
+
+/**
+ * Maven-specific upstream implementation.
+ *
+ * Handles:
+ * - Artifact fetching (JAR, POM, WAR, etc.)
+ * - Metadata fetching (maven-metadata.xml)
+ * - Checksum files (.md5, .sha1, .sha256, .sha512)
+ * - SNAPSHOT version handling
+ * - Content-addressable caching for release artifacts
+ */
+export class MavenUpstream extends BaseUpstream {
+  protected readonly protocolName = 'maven';
+
+  constructor(
+    config: IProtocolUpstreamConfig,
+    logger?: plugins.smartlog.Smartlog,
+  ) {
+    super(config, logger);
+  }
+
+  /**
+   * Fetch an artifact from upstream registries.
+   */
+  public async fetchArtifact(
+    groupId: string,
+    artifactId: string,
+    version: string,
+    extension: string,
+    classifier?: string,
+  ): Promise<Buffer | null> {
+    const path = this.buildArtifactPath(groupId, artifactId, version, extension, classifier);
+    const resource = `${groupId}:${artifactId}`;
+
+    const context: IUpstreamFetchContext = {
+      protocol: 'maven',
+      resource,
+      resourceType: 'artifact',
+      path,
+      method: 'GET',
+      headers: {},
+      query: {},
+    };
+
+    const result = await this.fetch(context);
+
+    if (!result || !result.success) {
+      return null;
+    }
+
+    return Buffer.isBuffer(result.body) ? result.body : Buffer.from(result.body);
+  }
+
+  /**
+   * Fetch maven-metadata.xml from upstream.
+   */
+  public async fetchMetadata(groupId: string, artifactId: string, version?: string): Promise<string | null> {
+    const groupPath = groupId.replace(/\./g, '/');
+    let path: string;
+
+    if (version) {
+      // Version-level metadata (for SNAPSHOTs)
+      path = `/${groupPath}/${artifactId}/${version}/maven-metadata.xml`;
+    } else {
+      // Artifact-level metadata (lists all versions)
+      path = `/${groupPath}/${artifactId}/maven-metadata.xml`;
+    }
+
+    const resource = `${groupId}:${artifactId}`;
+
+    const context: IUpstreamFetchContext = {
+      protocol: 'maven',
+      resource,
+      resourceType: 'metadata',
+      path,
+      method: 'GET',
+      headers: {
+        'accept': 'application/xml, text/xml',
+      },
+      query: {},
+    };
+
+    const result = await this.fetch(context);
+
+    if (!result || !result.success) {
+      return null;
+    }
+
+    if (Buffer.isBuffer(result.body)) {
+      return result.body.toString('utf8');
+    }
+
+    return typeof result.body === 'string' ? result.body : null;
+  }
+
+  /**
+   * Fetch a checksum file from upstream.
+   */
+  public async fetchChecksum(
+    groupId: string,
+    artifactId: string,
+    version: string,
+    extension: string,
+    checksumType: 'md5' | 'sha1' | 'sha256' | 'sha512',
+    classifier?: string,
+  ): Promise<string | null> {
+    const basePath = this.buildArtifactPath(groupId, artifactId, version, extension, classifier);
+    const path = `${basePath}.${checksumType}`;
+    const resource = `${groupId}:${artifactId}`;
+
+    const context: IUpstreamFetchContext = {
+      protocol: 'maven',
+      resource,
+      resourceType: 'checksum',
+      path,
+      method: 'GET',
+      headers: {
+        'accept': 'text/plain',
+      },
+      query: {},
+    };
+
+    const result = await this.fetch(context);
+
+    if (!result || !result.success) {
+      return null;
+    }
+
+    if (Buffer.isBuffer(result.body)) {
+      return result.body.toString('utf8').trim();
+    }
+
+    return typeof result.body === 'string' ? result.body.trim() : null;
+  }
+
+  /**
+   * Check if an artifact exists in upstream (HEAD request).
+   */
+  public async headArtifact(
+    groupId: string,
+    artifactId: string,
+    version: string,
+    extension: string,
+    classifier?: string,
+  ): Promise<{ exists: boolean; size?: number; lastModified?: string } | null> {
+    const path = this.buildArtifactPath(groupId, artifactId, version, extension, classifier);
+    const resource = `${groupId}:${artifactId}`;
+
+    const context: IUpstreamFetchContext = {
+      protocol: 'maven',
+      resource,
+      resourceType: 'artifact',
+      path,
+      method: 'HEAD',
+      headers: {},
+      query: {},
+    };
+
+    const result = await this.fetch(context);
+
+    if (!result) {
+      return null;
+    }
+
+    if (!result.success) {
+      return { exists: false };
+    }
+
+    return {
+      exists: true,
+      size: result.headers['content-length'] ? parseInt(result.headers['content-length'], 10) : undefined,
+      lastModified: result.headers['last-modified'],
+    };
+  }
+
+  /**
+   * Build the path for a Maven artifact.
+   */
+  private buildArtifactPath(
+    groupId: string,
+    artifactId: string,
+    version: string,
+    extension: string,
+    classifier?: string,
+  ): string {
+    const groupPath = groupId.replace(/\./g, '/');
+    let filename = `${artifactId}-${version}`;
+    if (classifier) {
+      filename += `-${classifier}`;
+    }
+    filename += `.${extension}`;
+
+    return `/${groupPath}/${artifactId}/${version}/${filename}`;
+  }
+
+  /**
+   * Override URL building for Maven-specific handling.
+   */
+  protected buildUpstreamUrl(
+    upstream: IUpstreamRegistryConfig,
+    context: IUpstreamFetchContext,
+  ): string {
+    let baseUrl = upstream.url;
+
+    // Remove trailing slash
+    if (baseUrl.endsWith('/')) {
+      baseUrl = baseUrl.slice(0, -1);
+    }
+
+    return `${baseUrl}${context.path}`;
+  }
+}

ts/maven/index.ts

@@ -3,5 +3,6 @@
  */
 
 export { MavenRegistry } from './classes.mavenregistry.js';
+export { MavenUpstream } from './classes.mavenupstream.js';
 export * from './interfaces.maven.js';
 export * from './helpers.maven.js';