Use web URL API instead of Node URL library

.gitmodules

@@ -1,3 +1,3 @@
 [submodule "test/suite"]
 	path = test/suite
-	url = git://github.com/json-schema-org/JSON-Schema-Test-Suite.git
+	url = https://github.com/json-schema-org/JSON-Schema-Test-Suite.git

lib/helpers.js

@@ -1,7 +1,5 @@
 'use strict';
 
-var uri = require('url');
-
 var ValidationError = exports.ValidationError = function ValidationError (message, instance, schema, path, name, argument) {
   if(Array.isArray(path)){
     this.path = path;
@@ -131,13 +129,13 @@ var SchemaContext = exports.SchemaContext = function SchemaContext (schema, opti
 };
 
 SchemaContext.prototype.resolve = function resolve (target) {
-  return uri.resolve(this.base, target);
+  return (() => resolveUrl(this.base,target))();
 };
 
 SchemaContext.prototype.makeChild = function makeChild(schema, propertyName){
   var path = (propertyName===undefined) ? this.path : this.path.concat([propertyName]);
   var id = schema.$id || schema.id;
-  var base = uri.resolve(this.base, id||'');
+  let base = (() => resolveUrl(this.base,id||''))();
   var ctx = new SchemaContext(schema, this.options, path, base, Object.create(this.schemas));
   if(id && !ctx.schemas[base]){
     ctx.schemas[base] = schema;
@@ -390,3 +388,19 @@ exports.isSchema = function isSchema(val){
   return (typeof val === 'object' && val) || (typeof val === 'boolean');
 };
 
+/**
+ * Resolve target URL from a base and relative URL.
+ * Similar to Node's URL Lib's legacy resolve function.
+ * Code from example in deprecation note in said library.
+ * @param string
+ * @param string
+ * @returns {string}
+ */
+var resolveUrl = exports.resolveUrl = function resolveUrl(from, to) {
+  const resolvedUrl = new URL(to, new URL(from, 'resolve://'));
+  if (resolvedUrl.protocol === 'resolve:') {
+    const { pathname, search, hash } = resolvedUrl;
+    return pathname + search + hash;
+  }
+  return resolvedUrl.toString();
+}

lib/scan.js

@@ -1,6 +1,5 @@
 "use strict";
 
-var urilib = require('url');
 var helpers = require('./helpers');
 
 module.exports.SchemaScanResult = SchemaScanResult;
@@ -20,12 +19,13 @@ module.exports.scan = function scan(base, schema){
     if(!schema || typeof schema!='object') return;
     // Mark all referenced schemas so we can tell later which schemas are referred to, but never defined
     if(schema.$ref){
-      var resolvedUri = urilib.resolve(baseuri, schema.$ref);
+      let resolvedUri = helpers.resolveUrl(baseuri,schema.$ref);
       ref[resolvedUri] = ref[resolvedUri] ? ref[resolvedUri]+1 : 0;
       return;
     }
     var id = schema.$id || schema.id;
-    var ourBase = id ? urilib.resolve(baseuri, id) : baseuri;
+    let resolvedBase = helpers.resolveUrl(baseuri,id);
+    var ourBase = id ? resolvedBase : baseuri;
     if (ourBase) {
       // If there's no fragment, append an empty one
       if(ourBase.indexOf('#')<0) ourBase += '#';

lib/validator.js

@@ -1,7 +1,5 @@
 'use strict';
 
-var urilib = require('url');
-
 var attribute = require('./attribute');
 var helpers = require('./helpers');
 var scanSchema = require('./scan').scan;
@@ -115,7 +113,7 @@ Validator.prototype.validate = function validate (instance, schema, options, ctx
   // This section indexes subschemas in the provided schema, so they don't need to be added with Validator#addSchema
   // This will work so long as the function at uri.resolve() will resolve a relative URI to a relative URI
   var id = schema.$id || schema.id;
-  var base = urilib.resolve(options.base||anonymousBase, id||'');
+  let base = helpers.resolveUrl(options.base,id||'');
   if(!ctx){
     ctx = new SchemaContext(schema, options, [], base, Object.create(this.schemas));
     if (!ctx.schemas[base]) {
@@ -262,8 +260,8 @@ Validator.prototype.resolve = function resolve (schema, switchSchema, ctx) {
     return {subschema: ctx.schemas[switchSchema], switchSchema: switchSchema};
   }
   // Else try walking the property pointer
-  var parsed = urilib.parse(switchSchema);
-  var fragment = parsed && parsed.hash;
+  let parsed = new URL(switchSchema,'thismessage::/');
+  let fragment = parsed.hash;
   var document = fragment && fragment.length && switchSchema.substr(0, switchSchema.length - fragment.length);
   if (!document || !ctx.schemas[document]) {
     throw new SchemaError("no such schema <" + switchSchema + ">", schema);