bszabo97 commented on code in PR #1682:
URL: https://github.com/apache/solr/pull/1682#discussion_r1224103038


##########
solr/core/src/java/org/apache/solr/handler/admin/api/GetSchemaFieldAPI.java:
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@@ -0,0 +1,255 @@
+package org.apache.solr.handler.admin.api;
+
+import static 
org.apache.solr.client.solrj.impl.BinaryResponseParser.BINARY_CONTENT_TYPE_V2;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+import java.util.List;
+import java.util.Map;
+import javax.inject.Inject;
+import javax.ws.rs.GET;
+import javax.ws.rs.Path;
+import javax.ws.rs.PathParam;
+import javax.ws.rs.Produces;
+import javax.ws.rs.core.MediaType;
+import org.apache.solr.common.MapWriter;
+import org.apache.solr.common.SolrException;
+import org.apache.solr.common.cloud.SolrClassLoader;
+import org.apache.solr.common.params.SolrParams;
+import org.apache.solr.common.util.NamedList;
+import org.apache.solr.common.util.SimpleOrderedMap;
+import org.apache.solr.core.PluginInfo;
+import org.apache.solr.jersey.PermissionName;
+import org.apache.solr.jersey.SolrJerseyResponse;
+import org.apache.solr.pkg.PackageListeningClassLoader;
+import org.apache.solr.schema.IndexSchema;
+import org.apache.solr.security.PermissionNameProvider;
+
+public class GetSchemaFieldAPI extends GetSchemaAPI {
+
+  private final SolrParams params;
+
+  @Inject
+  public GetSchemaFieldAPI(IndexSchema indexSchema, SolrParams params) {
+    super(indexSchema);
+    this.params = params;
+  }
+
+  @GET
+  @Path("/fields")
+  @Produces({MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML, 
BINARY_CONTENT_TYPE_V2})
+  @PermissionName(PermissionNameProvider.Name.SCHEMA_READ_PERM)
+  public SchemaListFieldsResponse listSchemaFields() {
+    SchemaListFieldsResponse response = 
instantiateJerseyResponse(SchemaListFieldsResponse.class);
+    final String realName = "fields";
+
+    response.fields = listAllFieldsOfType(realName, params);
+
+    return response;
+  }
+
+  public static class SchemaListFieldsResponse extends SolrJerseyResponse {
+    @JsonProperty("fields")
+    public Object fields;

Review Comment:
   To be honest I used the type `Object` since I have seen that the call 
`propertyValues.get()` returns an Object and did not really knew if there could 
be any possible scenarios where this is not a `List`... But the tests also 
suggest that this should always be an `ArrayList` so I will go ahead and change 
it everywhere



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