fix: Support yaml specifications

.editorconfig

@@ -0,0 +1,15 @@
+root = true
+
+[*]
+charset = utf-8
+indent_style = space
+indent_size = 2
+trim_trailing_whitespace = true
+end_of_line = lf
+insert_final_newline = true
+
+[*.properties]
+trim_trailing_whitespace = false
+
+[pom.xml]
+indent_style = unset

.pre-commit-config.yaml

@@ -1,23 +1,28 @@
 default_stages: [pre-commit]
 repos:
   - repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v4.5.0
+    rev: v6.0.0
     hooks:
       - id: end-of-file-fixer
       - id: trailing-whitespace
   - repo: https://github.com/Lucas-C/pre-commit-hooks
-    rev: v1.5.4
+    rev: v1.5.5
     hooks:
       - id: remove-crlf
       - id: remove-tabs
         args: [ --whitespaces-count=2 ]
   - repo: https://github.com/editorconfig-checker/editorconfig-checker.python
-    rev: 2.7.3
+    rev: 3.4.0
     hooks:
       - id: editorconfig-checker
   - repo: https://github.com/extenda/pre-commit-hooks
-    rev: v0.11.0
+    rev: v0.14.0
     hooks:
       - id: google-java-formatter
       - id: commitlint
         stages: [commit-msg]
+  - repo: https://github.com/adrienverge/yamllint.git
+    rev: v1.37.1
+    hooks:
+      - id: yamllint
+        args: [ --strict, -c=.yamllint ]

.yamllint

@@ -0,0 +1,17 @@
+extends: relaxed
+rules:
+  colons:
+    max-spaces-before: 0
+    max-spaces-after: -1
+  indentation:
+    spaces: 2
+    indent-sequences: true
+    check-multi-line-strings: false
+  line-length:
+    max: 150
+    allow-non-breakable-words: true
+    level: error
+  new-line-at-end-of-file: enable
+  new-lines:
+    type: unix
+  trailing-spaces: {}

pom.xml

@@ -38,7 +38,12 @@
   </dependencyManagement>
 
   <dependencies>
-
+    <dependency>
+      <groupId>org.yaml</groupId>
+      <artifactId>snakeyaml</artifactId>
+      <version>2.0</version>
+      <optional>true</optional>
+    </dependency>
     <dependency>
       <groupId>org.slf4j</groupId>
       <artifactId>slf4j-api</artifactId>

src/main/java/com/retailsvc/http/openapi/SpecificationLoader.java

@@ -8,6 +8,7 @@
 import java.util.function.Function;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
+import org.yaml.snakeyaml.Yaml;
 
 public class SpecificationLoader {
 
@@ -29,10 +30,17 @@ public static byte[] load(String spec) {
    * @return The openapi model
    */
   public static OpenApi parseSpecification(
-      String specificationPath, Function<String, OpenApi> mapper) {
+      String specificationPath, Function<String, OpenApi> mapper, Function<Object, String> toJson) {
     long t0 = System.currentTimeMillis();
     byte[] data = load(specificationPath);
     String openapiAsText = new String(data, StandardCharsets.UTF_8);
+
+    if (specificationPath.endsWith(".yaml") || specificationPath.endsWith(".yml")) {
+      var yaml = new Yaml();
+      Object yamlObj = yaml.load(openapiAsText);
+      openapiAsText = toJson.apply(yamlObj);
+    }
+
     OpenApi spec = OpenApi.parse(mapper, openapiAsText);
 
     LOG.debug(

src/test/java/com/retailsvc/http/ServerBaseTest.java

@@ -31,7 +31,7 @@ public abstract class ServerBaseTest {
 
   @BeforeEach
   void setUp() {
-    specification = parseSpecification("openapi.json", s -> gson.fromJson(s, OpenApi.class));
+    specification = parseSpecification("openapi.json", s -> gson.fromJson(s, OpenApi.class), null);
   }
 
   @AfterEach

src/test/java/com/retailsvc/http/start/ServerLauncher.java

@@ -3,6 +3,7 @@
 import static com.retailsvc.http.openapi.SpecificationLoader.parseSpecification;
 
 import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
 import com.retailsvc.http.ExceptionHandler;
 import com.retailsvc.http.Handlers;
 import com.retailsvc.http.OpenApiServer;
@@ -13,23 +14,27 @@
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.function.Function;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 public class ServerLauncher {
 
   private static final Logger LOG = LoggerFactory.getLogger(ServerLauncher.class);
 
-  public static void main(String[] args) throws Exception {
+  static void main() throws Exception {
     new ServerLauncher();
   }
 
   public ServerLauncher() throws IOException {
     long t0 = System.currentTimeMillis();
 
-    final Gson gson = new Gson();
+    final Gson gson = new GsonBuilder().setPrettyPrinting().create();
 
-    var specification = parseSpecification("openapi.json", s -> gson.fromJson(s, OpenApi.class));
+    Function<String, OpenApi> jsonToSpec = contents -> gson.fromJson(contents, OpenApi.class);
+    Function<Object, String> toJson = gson::toJson;
+
+    var specification = parseSpecification("openapi.yaml", jsonToSpec, toJson);
 
     Map<String, HttpHandler> handlers = new HashMap<>();
     handlers.put("get-data", new GetDataHandler());

src/test/resources/openapi.json

@@ -169,6 +169,16 @@
           }
         }
       }
+    },
+    "/anyOf": {
+      "post": {
+
+      }
+    },
+    "/allOf": {
+      "post": {
+
+      }
     }
   },
   "components": {