Parse operation name from query if omitted

fix #264

Author: oliemansm

graphql-java-kickstart/src/main/java/graphql/kickstart/execution/GraphQLRequest.java

@@ -1,5 +1,7 @@
 package graphql.kickstart.execution;
 
+import static graphql.kickstart.execution.OperationNameExtractor.extractOperationName;
+
 import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
 import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 
@@ -12,59 +14,57 @@
  */
 @JsonIgnoreProperties(ignoreUnknown = true)
 public class GraphQLRequest {
-    private String query;
-    @JsonDeserialize(using = VariablesDeserializer.class)
-    private Map<String, Object> variables = new HashMap<>();
-    private String operationName;
 
-    public GraphQLRequest() {
-    }
+  private String query;
+  @JsonDeserialize(using = VariablesDeserializer.class)
+  private Map<String, Object> variables = new HashMap<>();
+  private String operationName;
 
-    public GraphQLRequest(String query, Map<String, Object> variables, String operationName) {
-        this.query = query;
-        this.operationName = operationName;
-        if (variables != null) {
-            this.variables = variables;
-        }
-    }
+  public GraphQLRequest() {
+  }
 
-    public static GraphQLRequest createIntrospectionRequest() {
-        return new GraphQLRequest(IntrospectionQuery.INTROSPECTION_QUERY, new HashMap<>(), null);
+  public GraphQLRequest(String query, Map<String, Object> variables, String operationName) {
+    this.query = query;
+    this.operationName = operationName;
+    if (variables != null) {
+      this.variables = variables;
     }
+  }
 
-    public static GraphQLRequest createQueryOnlyRequest(String query) {
-        return new GraphQLRequest(query, new HashMap<>(), null);
-    }
+  public static GraphQLRequest createIntrospectionRequest() {
+    return new GraphQLRequest(IntrospectionQuery.INTROSPECTION_QUERY, new HashMap<>(), "IntrospectionQuery");
+  }
 
-    public String getQuery() {
-        return query;
-    }
+  public static GraphQLRequest createQueryOnlyRequest(String query) {
+    return new GraphQLRequest(query, new HashMap<>(), null);
+  }
 
-    public void setQuery(String query) {
-        this.query = query;
-    }
+  public String getQuery() {
+    return query;
+  }
 
-    public Map<String, Object> getVariables() {
-        return variables;
-    }
+  public void setQuery(String query) {
+    this.query = query;
+  }
+
+  public Map<String, Object> getVariables() {
+    return variables;
+  }
 
-    public void setVariables(Map<String, Object> variables) {
-        if (variables != null) {
-            this.variables = variables;
-        }
+  public void setVariables(Map<String, Object> variables) {
+    if (variables != null) {
+      this.variables = variables;
     }
+  }
 
-    public String getOperationName() {
-        if (operationName != null && !operationName.isEmpty()) {
-            return operationName;
-        }
+  public String getOperationName() {
+    return extractOperationName(query, operationName, null);
+  }
 
-        return null;
-    }
+  public void setOperationName(String operationName) {
+    this.operationName = operationName;
+  }
 
-    public void setOperationName(String operationName) {
-        this.operationName = operationName;
-    }
 }
 
 

graphql-java-kickstart/src/main/java/graphql/kickstart/execution/OperationNameExtractor.java

@@ -0,0 +1,42 @@
+package graphql.kickstart.execution;
+
+import static graphql.kickstart.execution.StringUtils.isNotEmpty;
+
+import graphql.language.Document;
+import graphql.language.OperationDefinition;
+import graphql.parser.InvalidSyntaxException;
+import graphql.parser.Parser;
+import java.util.List;
+import lombok.AccessLevel;
+import lombok.NoArgsConstructor;
+
+@NoArgsConstructor(access = AccessLevel.PRIVATE)
+class OperationNameExtractor {
+
+  static String extractOperationName(String gqlQuery, String requestedOperationName, String defaultIfNotFound) {
+    if (isNotEmpty(requestedOperationName)) {
+      return requestedOperationName;
+    }
+    if (isNotEmpty(gqlQuery)) {
+      return parseForOperationName(gqlQuery, defaultIfNotFound);
+    }
+    return defaultIfNotFound;
+  }
+
+  private static String parseForOperationName(String gqlQuery, String defaultIfNotFound) {
+    try {
+      Document document = new Parser().parseDocument(gqlQuery);
+      List<OperationDefinition> operations = document.getDefinitionsOfType(OperationDefinition.class);
+      if (operations.size() == 1) {
+        String name = operations.get(0).getName();
+        if (isNotEmpty(name)) {
+          return name;
+        }
+      }
+    } catch (InvalidSyntaxException ignored) {
+      // ignored
+    }
+    return defaultIfNotFound;
+  }
+
+}

graphql-java-kickstart/src/main/java/graphql/kickstart/execution/StringUtils.java

@@ -0,0 +1,17 @@
+package graphql.kickstart.execution;
+
+import lombok.AccessLevel;
+import lombok.NoArgsConstructor;
+
+@NoArgsConstructor(access = AccessLevel.PRIVATE)
+class StringUtils {
+
+  static boolean isNotEmpty(CharSequence cs) {
+    return !isEmpty(cs);
+  }
+
+  static boolean isEmpty(final CharSequence cs) {
+    return cs == null || cs.length() == 0;
+  }
+
+}