fix: #16 Add retrieval of _meta field when reading Resource

Signed-off-by: Laurent Broudoux <laurent.broudoux@gmail.com>

Author: lbroudoux

dev/github-api-resources.yaml

@@ -9,6 +9,11 @@ resources:
     description: Display GitHub user information from get_user_with_latest_followers tool
     mimeType: text/html;profile=mcp-app
     remoteContent: http://localhost:3030/mcp-app.html
+    _meta:
+      ui:
+        csp:
+          resourceDomains:
+            - https://avatars.githubusercontent.com
     tools:
       - get_user_with_latest_followers:
           visibility:

proxy/src/main/java/io/reshapr/proxy/mcp/McpController.java

@@ -15,22 +15,29 @@
  */
 package io.reshapr.proxy.mcp;
 
-import com.fasterxml.jackson.core.type.TypeReference;
-import com.fasterxml.jackson.databind.ObjectMapper;
-
-import io.reshapr.proxy.mcp.converters.*;
+import io.reshapr.proxy.mcp.converters.GraphQLMcpToolConverter;
+import io.reshapr.proxy.mcp.converters.GrpcMcpToolConverter;
+import io.reshapr.proxy.mcp.converters.McpToolConverter;
+import io.reshapr.proxy.mcp.converters.OpenAPIMcpToolConverter;
 import io.reshapr.proxy.mcp.converters.ReshaprCustomToolsMcpToolConverter;
 import io.reshapr.proxy.mcp.state.ElicitationStore;
 import io.reshapr.proxy.context.SessionInfo;
 import io.reshapr.proxy.mcp.state.SessionStore;
 import io.reshapr.proxy.proxy.GrpcProxyService;
 import io.reshapr.proxy.proxy.ProxyService;
-import io.reshapr.proxy.registry.*;
 import io.reshapr.proxy.context.MethodHandlingInfo;
 import io.reshapr.proxy.context.MethodHandlingContext;
+import io.reshapr.proxy.registry.ArtifactEntryType;
+import io.reshapr.proxy.registry.ConfigurationEntry;
+import io.reshapr.proxy.registry.GatewayRegistry;
+import io.reshapr.proxy.registry.OperationEntry;
+import io.reshapr.proxy.registry.SecretEntry;
+import io.reshapr.proxy.registry.ServiceEntry;
 import io.reshapr.proxy.security.SecureEndpoint;
 import io.reshapr.proxy.util.WebUtils;
 
+import com.fasterxml.jackson.core.type.TypeReference;
+import com.fasterxml.jackson.databind.ObjectMapper;
 import io.smallrye.common.annotation.RunOnVirtualThread;
 import io.vertx.core.http.HttpServerRequest;
 import jakarta.annotation.Nullable;

proxy/src/main/java/io/reshapr/proxy/mcp/McpSchema.java

@@ -568,7 +568,12 @@ public sealed interface ResourceContents permits TextResourceContents, BlobResou
    public record TextResourceContents(
          @JsonProperty("uri") String uri,
          @JsonProperty("mimeType") String mimeType,
-         @JsonProperty("text") String text) implements ResourceContents {
+         @JsonProperty("text") String text,
+         @JsonProperty("_meta") Map<String, Object> meta) implements ResourceContents, Meta {
+
+      public TextResourceContents(String uri, String mimeType, String text) {
+         this(uri, mimeType, text, null);
+      }
    }
 
    @JsonInclude(JsonInclude.Include.NON_ABSENT)

proxy/src/main/java/io/reshapr/proxy/mcp/ReshaprResourcesMcpResourceBuilder.java

@@ -221,8 +221,10 @@ public List<McpSchema.ResourceContents> readResource(McpSchema.ReadResourceReque
                BackendResponse fetchResponse = proxyService.callBackend(configuration, URI.create(remoteResourceUrl),
                      "GET", Collections.emptyMap(), null);
 
+               Map<String, Object> meta = resourceNode.has("_meta") ?
+                     YAML_MAPPER.convertValue(resourceNode.get("_meta"), new TypeReference<Map<String, Object>>() {}) : null;
                results.add(new McpSchema.TextResourceContents(request.uri(), "text/html;profile=mcp-app",
-                     new String(fetchResponse.content(), StandardCharsets.UTF_8)));
+                     new String(fetchResponse.content(), StandardCharsets.UTF_8), meta));
             }
          }
       }