Allow passing query parameters in signout

Author: Olga Dalton

MSAL/IdentityCore

@@ -1458,6 +1458,10 @@ - (void)signoutWithAccount:(nonnull MSALAccount *)account
     msidParams.platformSequence = [NSString msidUpdatePlatformSequenceParamWithSrcName:[MSIDVersion platformName]
                                                                             srcVersion:[MSIDVersion sdkVersion]
                                                                               sequence:nil];
+    
+    // Extra parameters to be added to the /authorize endpoint.
+    msidParams.extraURLQueryParameters = signoutParameters.extraQueryParameters;
+    
     NSError *localError;
     BOOL localRemovalResult = [self removeAccountImpl:account wipeAccount:signoutParameters.wipeAccount error:&localError];
 

MSAL/src/MSALPublicClientApplication.m

@@ -68,6 +68,11 @@ NS_ASSUME_NONNULL_BEGIN
 */
 @property (nonatomic) BOOL wipeCacheForAllAccounts;
 
+/**
+ Key-value pairs to pass to the logout endpoint. This should not be url-encoded value.
+ */
+@property (nonatomic, nullable) NSDictionary <NSString *, NSString *> *extraQueryParameters;
+
 /**
  Initialize MSALSignoutParameters with web parameters.
  

MSAL/src/public/MSALSignoutParameters.h

@@ -3565,6 +3565,7 @@ - (void)testSignoutWithAccount_whenNonNilAccount_andSignoutFromBrowserTrue_andBr
     MSALWebviewParameters *webParams = [[MSALWebviewParameters alloc] initWithAuthPresentationViewController:[self.class sharedViewControllerStub]];
     MSALSignoutParameters *parameters = [[MSALSignoutParameters alloc] initWithWebviewParameters:webParams];
     parameters.signoutFromBrowser = YES;
+    parameters.extraQueryParameters = @{@"key1": @"value1"};
     MSALGlobalConfig.brokerAvailability = MSALBrokeredAvailabilityNone;
 
     XCTAssertEqual([application allAccounts:nil].count, 1);
@@ -3581,6 +3582,7 @@ - (void)testSignoutWithAccount_whenNonNilAccount_andSignoutFromBrowserTrue_andBr
 
         XCTAssertEqualObjects(params.accountIdentifier.displayableId, @"[email protected]");
         XCTAssertEqualObjects(params.accountIdentifier.homeAccountId, @"myuid.utid");
+        XCTAssertEqualObjects(params.extraURLQueryParameters[@"key1"], @"value1");
 
         XCTAssertEqualObjects(params.authority.url.absoluteString, @"https://login.microsoftonline.com/common");
         XCTAssertEqualObjects(params.clientId, UNIT_TEST_CLIENT_ID);