Allow "same-origin" as "Referrer-Policy"

Fixes #11531

Although "same-origin" is more strict than e.g. strict-origin it showed up a warning in setupcheck
Based on https://scotthelme.co.uk/a-new-security-header-referrer-policy/

Signed-off-by: Moritz Beck <git@birkenstab.de>

core/js/setupchecks.js

@@ -447,15 +447,17 @@
 					(xhr.getResponseHeader('Referrer-Policy').toLowerCase() !== 'no-referrer' &&
 					xhr.getResponseHeader('Referrer-Policy').toLowerCase() !== 'no-referrer-when-downgrade' &&
 					xhr.getResponseHeader('Referrer-Policy').toLowerCase() !== 'strict-origin' &&
-					xhr.getResponseHeader('Referrer-Policy').toLowerCase() !== 'strict-origin-when-cross-origin')) {
+					xhr.getResponseHeader('Referrer-Policy').toLowerCase() !== 'strict-origin-when-cross-origin' &&
+					xhr.getResponseHeader('Referrer-Policy').toLowerCase() !== 'same-origin')) {
 					messages.push({
-						msg: t('core', 'The "{header}" HTTP header is not set to "{val1}", "{val2}", "{val3}" or "{val4}". This can leak referer information. See the <a target="_blank" rel="noreferrer noopener" href="{link}">W3C Recommendation ↗</a>.',
+						msg: t('core', 'The "{header}" HTTP header is not set to "{val1}", "{val2}", "{val3}", "{val4}" or "{val5}". This can leak referer information. See the <a target="_blank" rel="noreferrer noopener" href="{link}">W3C Recommendation ↗</a>.',
 							{
 								header: 'Referrer-Policy',
 								val1: 'no-referrer',
 								val2: 'no-referrer-when-downgrade',
 								val3: 'strict-origin',
 								val4: 'strict-origin-when-cross-origin',
+								val5: 'same-origin',
 								link: 'https://www.w3.org/TR/referrer-policy/'
 							}),
 						type: OC.SetupChecks.MESSAGE_TYPE_INFO

core/js/tests/specs/setupchecksSpec.js

@@ -830,7 +830,7 @@ describe('OC.SetupChecks tests', function() {
 					msg: 'The "X-Permitted-Cross-Domain-Policies" HTTP header is not set to "none". This is a potential security or privacy risk, as it is recommended to adjust this setting accordingly.',
 					type: OC.SetupChecks.MESSAGE_TYPE_WARNING
 				}, {
-					msg: 'The "Referrer-Policy" HTTP header is not set to "no-referrer", "no-referrer-when-downgrade", "strict-origin" or "strict-origin-when-cross-origin". This can leak referer information. See the <a href="https://www.w3.org/TR/referrer-policy/" rel="noreferrer noopener">W3C Recommendation ↗</a>.',
+					msg: 'The "Referrer-Policy" HTTP header is not set to "no-referrer", "no-referrer-when-downgrade", "strict-origin", "strict-origin-when-cross-origin" or "same-origin". This can leak referer information. See the <a href="https://www.w3.org/TR/referrer-policy/" rel="noreferrer noopener">W3C Recommendation ↗</a>.',
 					type: OC.SetupChecks.MESSAGE_TYPE_INFO
 				}
 				]);
@@ -975,7 +975,7 @@ describe('OC.SetupChecks tests', function() {
 				});
 			});
 
-			it('should return a message if Referrer-Policy is set to same-origin', function(done) {
+			it('should return no message if Referrer-Policy is set to same-origin', function(done) {
 				protocolStub.returns('https');
 				var result = OC.SetupChecks.checkGeneric();
 
@@ -991,12 +991,7 @@ describe('OC.SetupChecks tests', function() {
 				});
 
 				result.done(function( data, s, x ){
-					expect(data).toEqual([
-						{
-							msg: 'The "Referrer-Policy" HTTP header is not set to "no-referrer", "no-referrer-when-downgrade", "strict-origin" or "strict-origin-when-cross-origin". This can leak referer information. See the <a href="https://www.w3.org/TR/referrer-policy/" rel="noreferrer noopener">W3C Recommendation ↗</a>.',
-							type: OC.SetupChecks.MESSAGE_TYPE_INFO
-						}
-					]);
+					expect(data).toEqual([]);
 					done();
 				});
 			});
@@ -1019,7 +1014,7 @@ describe('OC.SetupChecks tests', function() {
 				result.done(function( data, s, x ){
 					expect(data).toEqual([
 						{
-							msg: 'The "Referrer-Policy" HTTP header is not set to "no-referrer", "no-referrer-when-downgrade", "strict-origin" or "strict-origin-when-cross-origin". This can leak referer information. See the <a href="https://www.w3.org/TR/referrer-policy/" rel="noreferrer noopener">W3C Recommendation ↗</a>.',
+							msg: 'The "Referrer-Policy" HTTP header is not set to "no-referrer", "no-referrer-when-downgrade", "strict-origin", "strict-origin-when-cross-origin" or "same-origin". This can leak referer information. See the <a href="https://www.w3.org/TR/referrer-policy/" rel="noreferrer noopener">W3C Recommendation ↗</a>.',
 							type: OC.SetupChecks.MESSAGE_TYPE_INFO
 						}
 					]);
@@ -1045,7 +1040,7 @@ describe('OC.SetupChecks tests', function() {
 				result.done(function( data, s, x ){
 					expect(data).toEqual([
 						{
-							msg: 'The "Referrer-Policy" HTTP header is not set to "no-referrer", "no-referrer-when-downgrade", "strict-origin" or "strict-origin-when-cross-origin". This can leak referer information. See the <a href="https://www.w3.org/TR/referrer-policy/" rel="noreferrer noopener">W3C Recommendation ↗</a>.',
+							msg: 'The "Referrer-Policy" HTTP header is not set to "no-referrer", "no-referrer-when-downgrade", "strict-origin", "strict-origin-when-cross-origin" or "same-origin". This can leak referer information. See the <a href="https://www.w3.org/TR/referrer-policy/" rel="noreferrer noopener">W3C Recommendation ↗</a>.',
 							type: OC.SetupChecks.MESSAGE_TYPE_INFO
 						}
 					]);
@@ -1071,7 +1066,7 @@ describe('OC.SetupChecks tests', function() {
 				result.done(function( data, s, x ){
 					expect(data).toEqual([
 						{
-							msg: 'The "Referrer-Policy" HTTP header is not set to "no-referrer", "no-referrer-when-downgrade", "strict-origin" or "strict-origin-when-cross-origin". This can leak referer information. See the <a href="https://www.w3.org/TR/referrer-policy/" rel="noreferrer noopener">W3C Recommendation ↗</a>.',
+							msg: 'The "Referrer-Policy" HTTP header is not set to "no-referrer", "no-referrer-when-downgrade", "strict-origin", "strict-origin-when-cross-origin" or "same-origin". This can leak referer information. See the <a href="https://www.w3.org/TR/referrer-policy/" rel="noreferrer noopener">W3C Recommendation ↗</a>.',
 							type: OC.SetupChecks.MESSAGE_TYPE_INFO
 						}
 					]);