Fix for issue 258 (Code roll-in to Swagger 2.0)

modules/swagger-parser/src/main/java/io/swagger/parser/util/SwaggerDeserializer.java

@@ -32,6 +32,8 @@ public class SwaggerDeserializer {
     protected static Set<String> BODY_PARAMETER_KEYS = new LinkedHashSet<String>(Arrays.asList("name", "in", "description", "required", "schema"));
     protected static Set<String> SECURITY_SCHEME_KEYS = new LinkedHashSet<String>(Arrays.asList("type", "name", "in", "description", "flow", "authorizationUrl", "tokenUrl" , "scopes"));
 
+    private final Set<String> operationIDs = new HashSet<>();
+
     public SwaggerDeserializationResult deserialize(JsonNode rootNode) {
         SwaggerDeserializationResult result = new SwaggerDeserializationResult();
         ParseResult rootParse = new ParseResult();
@@ -301,7 +303,7 @@ public Operation operation(ObjectNode obj, String location, ParseResult result)
         ExternalDocs docs = externalDocs(externalDocs, location, result);
         output.setExternalDocs(docs);
 
-        value = getString("operationId", obj, false, location, result);
+        value = getString("operationId", obj, false, location, result, operationIDs);
         output.operationId(value);
 
         array = getArray("consumes", obj, false, location, result);
@@ -1577,6 +1579,10 @@ else if(!v.isValueNode()) {
     }
 
     public String getString(String key, ObjectNode node, boolean required, String location, ParseResult result) {
+        return getString(key, node, required, location, result, null);
+    }
+
+    public String getString(String key, ObjectNode node, boolean required, String location, ParseResult result, Set<String> uniqueValues) {
         String value = null;
         JsonNode v = node.get(key);
         if (node == null || v == null) {
@@ -1590,6 +1596,10 @@ else if(!v.isValueNode()) {
         }
         else {
             value = v.asText();
+            if (uniqueValues != null && !uniqueValues.add(value)) {
+                result.unique(location, "operationId");
+                result.invalid();
+            }
         }
         return value;
     }
@@ -1614,6 +1624,7 @@ protected static class ParseResult {
         private Map<Location, JsonNode> unsupported = new LinkedHashMap<Location, JsonNode>();
         private Map<Location, String> invalidType = new LinkedHashMap<Location, String>();
         private List<Location> missing = new ArrayList<Location>();
+        private List<Location> unique = new ArrayList<>();
 
         public ParseResult() {
         }
@@ -1626,6 +1637,10 @@ public void extra(String location, String key, JsonNode value) {
             extra.put(new Location(location, key), value);
         }
 
+        public void unique(String location, String key) {
+            unique.add(new Location(location, key));
+        }
+
         public void missing(String location, String key) {
             missing.add(new Location(location, key));
         }
@@ -1695,6 +1710,11 @@ public List<String> getMessages() {
                 String message = "attribute " + location + l.key + " is missing";
                 messages.add(message);
             }
+            for (Location l : unique) {
+                String location = l.location.equals("") ? "" : l.location + ".";
+                String message = "attribute " + location + l.key + " is repeated";
+                messages.add(message);
+            }
             for(Location l : unsupported.keySet()) {
                 String location = l.location.equals("") ? "" : l.location + ".";
                 String message = "attribute " + location + l.key + " is unsupported";

modules/swagger-parser/src/test/java/io/swagger/parser/SwaggerParserTest.java

@@ -1248,4 +1248,12 @@ public void testIssue844() {
         assertEquals(swagger.getSwagger().getPath("/pets/{id}").getGet().getParameters().get(0).getIn(), "header");
     }
 
+    @Test
+    public void testIssue258() {
+        SwaggerDeserializationResult result = new SwaggerParser().readWithInfo("duplicateOperationId.json", null, true);
+        assertNotNull(result);
+        assertNotNull(result.getSwagger());
+        assertEquals(result.getMessages().get(0), "attribute paths.'/pets/{id}'(post).operationId is repeated");
+    }
+
 }

modules/swagger-parser/src/test/resources/duplicateOperationId.json

@@ -0,0 +1,27 @@
+{
+  "swagger": "2.0",
+  "info": {
+    "version": "1.0.9-abcd",
+    "title": "Duplicate operationID"
+  },
+  "paths": {
+    "/pets/{id}": {
+      "get": {
+        "operationId": "getPetsById",
+        "responses": {
+          "default": {
+            "description": "error payload"
+          }
+        }
+      },
+      "post": {
+        "operationId": "getPetsById",
+        "responses": {
+          "default": {
+            "description": "error payload"
+          }
+        }
+      }
+    }
+  }
+}