fix(@opentelemetry/exporter-collector-grpc) regression from #2130 when host specified without protocol (#2322)

* fix regression from #2130 when host specified without protocol

* Update util.test.ts

* Apply suggestions from code review

Co-authored-by: Naseem <naseemkullah@gmail.com>

* revert package.json changes

* Update util.ts

* add tests as per @MSNev request

* Update packages/opentelemetry-exporter-collector-grpc/src/util.ts

Co-authored-by: Naseem <naseemkullah@gmail.com>

Co-authored-by: Naseem <naseemkullah@gmail.com>

Author: lizthegrey

packages/opentelemetry-exporter-collector-grpc/src/util.ts

@@ -108,8 +108,12 @@ export function send<ExportItem, ServiceRequest>(
 }
 
 export function validateAndNormalizeUrl(url: string): string {
+  const hasProtocol = url.match(/^([\w]{1,8}):\/\//);
+  if (!hasProtocol) {
+    url = `https://${url}`;
+  }
   const target = new URL(url);
-  if (target.pathname !== '/') {
+  if (target.pathname && target.pathname !== '/') {
     diag.warn(
       'URL path should not be set when using grpc, the path part of the URL will be ignored.'
     );

packages/opentelemetry-exporter-collector-grpc/test/util.test.ts

@@ -0,0 +1,81 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import * as sinon from 'sinon';
+import * as assert from 'assert';
+
+import { diag } from '@opentelemetry/api';
+import { validateAndNormalizeUrl } from '../src/util';
+
+// Tests added to detect breakage released in #2130
+describe('validateAndNormalizeUrl()', () => {
+  const tests = [
+    {
+      name: 'bare hostname should return same value',
+      input: 'api.datacat.io',
+      expected: 'api.datacat.io',
+    },
+    {
+      name: 'host:port should return same value',
+      input: 'api.datacat.io:1234',
+      expected: 'api.datacat.io:1234',
+    },
+    {
+      name: 'grpc://host:port should trim off protocol',
+      input: 'grpc://api.datacat.io:1234',
+      expected: 'api.datacat.io:1234',
+    },
+    {
+      name: 'bad protocol should warn but return host:port',
+      input: 'badproto://api.datacat.io:1234',
+      expected: 'api.datacat.io:1234',
+      warn: 'URL protocol should be http(s):// or grpc(s)://. Using grpc://.',
+    },
+    {
+      name: 'path on end of url should warn but return host:port',
+      input: 'grpc://api.datacat.io:1234/a/b/c',
+      expected: 'api.datacat.io:1234',
+      warn: 'URL path should not be set when using grpc, the path part of the URL will be ignored.',
+    },
+    {
+      name: ':// in path should not be used for protocol even if protocol not specified',
+      input: 'api.datacat.io/a/b://c',
+      expected: 'api.datacat.io',
+      warn: 'URL path should not be set when using grpc, the path part of the URL will be ignored.',
+    },
+    {
+      name: ':// in path is valid when a protocol is specified',
+      input: 'grpc://api.datacat.io/a/b://c',
+      expected: 'api.datacat.io',
+      warn: 'URL path should not be set when using grpc, the path part of the URL will be ignored.',
+    },
+  ];
+  tests.forEach(test => {
+    it(test.name, () => {
+      const diagWarn = sinon.stub(diag, 'warn');
+      try {
+        assert.strictEqual(validateAndNormalizeUrl(test.input), (test.expected));
+        if (test.warn) {
+          sinon.assert.calledWith(diagWarn, test.warn);
+        } else {
+          sinon.assert.notCalled(diagWarn);
+        }
+      } finally {
+        diagWarn.restore();
+      }
+    });
+  });
+});