adds support for parsing http urls

fixes #12

Author: ivangsa

src/main/java/io/zenwave360/jsonrefparser/$RefParser.java

@@ -85,7 +85,12 @@ public class $RefParser {
         if(file != null) {
             refs = new $Refs(Parser.parse(file), uri);
         } else if (uri != null) {
-            refs = new $Refs(Parser.parse(uri), uri);
+            if (uri.getScheme() != null && ("http".equals(uri.getScheme()) || "https".equals(uri.getScheme()))) {
+                var text = this.resolvers.get(RefFormat.URL).resolve($Ref.of(uri.toURL().toExternalForm(), uri));
+                refs = new $Refs(Parser.parse(text), uri);
+            } else {
+                refs = new $Refs(Parser.parse(uri), uri);
+            }
         } else {
             refs = new $Refs(Parser.parse(json));
         }

src/main/java/io/zenwave360/jsonrefparser/parser/Parser.java

@@ -47,7 +47,7 @@ public static ExtendedJsonContext parse(URI uri) throws IOException {
                 return parse(inputStream, uri);
             }
         }
-        // TODO: it does not support yet parsing http/https files directly
+        // It does not support parsing http/https files directly: use `$RefParser(uri).parse()` instead
         try(var inputStream = new FileInputStream(new File(uri))) {
             return parse(inputStream, uri);
         }

src/main/java/io/zenwave360/jsonrefparser/resolver/HttpResolver.java

@@ -57,6 +57,7 @@ public String resolve($Ref $ref) {
             throw new RuntimeException(e);
         }
     }
+
     protected String downloadUrlToString(String url, List<AuthenticationValue> auths) throws Exception {
         InputStream is = null;
         BufferedReader br = null;

src/test/java/io/zenwave360/jsonrefparser/ParserTest.java

@@ -166,6 +166,16 @@ public void testDereferenceAndMergeAllOf() throws IOException {
         assertNoRefs(refs.schema());
     }
 
+    @Test
+    public void testDereferenceAndMergeAllOfHttp() throws IOException {
+        var uri = URI.create("https://raw.githubusercontent.com/ZenWave360/json-schema-ref-parser-jvm/refs/heads/main/src/test/resources/openapi/allOf.yml");
+        $RefParser parser = new $RefParser(uri).parse();
+        $Refs refs = parser.dereference().mergeAllOf().getRefs();
+        //        Assert.assertFalse(refs.circular);
+        //        System.out.println(mapper.writerWithDefaultPrettyPrinter().writeValueAsString(refs.schema()));
+        assertNoRefs(refs.schema());
+    }
+
     @Test
     public void testDereferenceAndMerge_MultipleAllOf() throws IOException {
         File file = new File("src/test/resources/asyncapi/multiple-allOf.yml");