Use URITranslator to use local files instead of remote (#1457)

Remove local schema files, use the ones provided in the dependency
Add support for 202012
Update tests

Author: jeromevdl

powertools-validation/src/main/java/software/amazon/lambda/powertools/validation/ValidationConfig.java

@@ -49,7 +49,7 @@ public SpecVersion.VersionFlag getSchemaVersion() {
     /**
      * Set the version of the json schema specifications (default is V7)
      *
-     * @param version May be V4, V6, V7 or V201909
+     * @param version May be V4, V6, V7, V201909 or V202012
      */
     public void setSchemaVersion(SpecVersion.VersionFlag version) {
         if (version != jsonSchemaVersion) {

powertools-validation/src/main/java/software/amazon/lambda/powertools/validation/ValidationUtils.java

@@ -21,7 +21,9 @@
 import com.fasterxml.jackson.databind.node.JsonNodeType;
 import com.fasterxml.jackson.databind.node.NullNode;
 import com.networknt.schema.JsonSchema;
+import com.networknt.schema.SchemaValidatorsConfig;
 import com.networknt.schema.ValidationMessage;
+import com.networknt.schema.uri.URITranslator;
 import io.burt.jmespath.Expression;
 import java.io.ByteArrayOutputStream;
 import java.io.InputStream;
@@ -257,7 +259,10 @@ private static JsonSchema createJsonSchema(String schema) {
             String filePath = schema.substring(CLASSPATH.length());
             try (InputStream schemaStream = ValidationAspect.class.getResourceAsStream(filePath)) {
 
-                jsonSchema = ValidationConfig.get().getFactory().getSchema(schemaStream);
+                SchemaValidatorsConfig config = new SchemaValidatorsConfig();
+                config.addUriTranslator(URITranslator.prefix("https://json-schema.org", "resource:"));
+
+                jsonSchema = ValidationConfig.get().getFactory().getSchema(schemaStream, config);
             } catch (Exception e) {
                 throw new IllegalArgumentException(
                         "'" + schema + "' is invalid, verify '" + filePath + "' is in your classpath");
@@ -270,13 +275,13 @@ private static JsonSchema createJsonSchema(String schema) {
     }
 
     private static void validateSchema(String schema, JsonSchema jsonSchema) {
-        String version = ValidationConfig.get().getSchemaVersion().toString();
+        String schemaId = ValidationConfig.get().getSchemaVersion().getId().replace("https://json-schema.org", "");
         try {
             validate(jsonSchema.getSchemaNode(),
-                    getJsonSchema("classpath:/schemas/meta_schema_" + version));
+                    getJsonSchema(CLASSPATH + schemaId));
         } catch (ValidationException ve) {
             throw new IllegalArgumentException(
-                    "The schema " + schema + " is not valid, it does not respect the specification " + version, ve);
+                    "The schema " + schema + " is not valid, it does not respect the specification " + schemaId, ve);
         }
     }