Add new /reg endpoints service resource-caps to remove dependency on …

…cadc ws

tap/src/main/java/ca/nrc/cadc/sample/RubinRegistryServlet.java

@@ -0,0 +1,83 @@
+package ca.nrc.cadc.sample;
+
+import org.apache.log4j.Logger;
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.PrintWriter;
+import java.io.BufferedReader;
+import java.nio.charset.StandardCharsets;
+
+/**
+ * A servlet that serves registry content from a webapp resource file.
+ *
+ * @author stvoutsin
+ */
+public class RubinRegistryServlet extends HttpServlet {
+
+    private static final Logger log = Logger.getLogger(RubinRegistryServlet.class);
+    private static final String DEFAULT_REGISTRY_FILE = "/resource-caps";
+
+    /**
+     * Read and return the content of the registry file from the webapp 'resource-caps' resource.
+     *
+     * @param request  the HttpServletRequest object that contains the request
+     * @param response the HttpServletResponse object that contains the response
+     * @throws ServletException if an input or output error is detected when the servlet handles the GET request
+     * @throws IOException if the request for the GET could not be handled
+     */
+    @Override
+    protected void doGet(HttpServletRequest request, HttpServletResponse response) 
+        throws ServletException, IOException {
+        try {
+            String registryContent = getRegistryContent(request);
+
+            response.setContentType("text/plain");
+            response.setCharacterEncoding("UTF-8");
+
+            try (PrintWriter writer = response.getWriter()) {
+                writer.write(registryContent);
+            }
+        } catch (IOException e) {
+            log.error("Error serving registry content", e);
+            response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, 
+                "An error occurred while processing the request: " + e.getMessage());
+        }
+    }
+
+    /**
+     * Reads and returns the content of the registry file from webapp resources.
+     *
+     * @param request the HttpServletRequest
+     * @return the content of the registry file as a string
+     * @throws IOException if there's an error reading the file
+     */
+    private String getRegistryContent(HttpServletRequest request) throws IOException {
+        String pathInfo = request.getPathInfo();
+        String resourcePath = DEFAULT_REGISTRY_FILE;
+
+        if (pathInfo != null && !pathInfo.isEmpty()) {
+            resourcePath = pathInfo;
+        }
+
+        InputStream inputStream = getServletContext().getResourceAsStream(resourcePath);
+        if (inputStream == null) {
+            throw new IOException("Registry file not found in webapp: " + resourcePath);
+        }
+
+        StringBuilder content = new StringBuilder();
+        try (BufferedReader reader = new BufferedReader(
+                new InputStreamReader(inputStream, StandardCharsets.UTF_8))) {
+            String line;
+            while ((line = reader.readLine()) != null) {
+                content.append(line).append("\n");
+            }
+        }
+
+        return content.toString();
+    }
+}

tap/src/main/webapp/WEB-INF/web.xml

@@ -216,6 +216,16 @@
             <url-pattern>/results/*</url-pattern>
     </servlet-mapping>
 
+    <servlet>
+        <servlet-name>RubinRegistryServlet</servlet-name>
+        <servlet-class>ca.nrc.cadc.sample.RubinRegistryServlet</servlet-class>
+    </servlet>
+
+    <servlet-mapping>
+        <servlet-name>RubinRegistryServlet</servlet-name>
+        <url-pattern>/reg/*</url-pattern>
+    </servlet-mapping>
+
     <servlet-mapping>
             <servlet-name>AsyncServlet</servlet-name>
             <url-pattern>/async/*</url-pattern>

tap/src/main/webapp/resource-caps

@@ -0,0 +1,6 @@
+#
+# This file maps resource identifiers to the location of capability
+# information.
+#
+
+