From fddfe1b5adc37fc4806471482f253cab3a41bb59 Mon Sep 17 00:00:00 2001
From: Brandon Stalnaker <bstalnaker@mparticle.com>
Date: Tue, 30 Apr 2024 10:04:41 -0400
Subject: [PATCH] fix: Allow Alias When Start and End Time Not Set

---
 UnitTests/MPIdentityTests.m                  | 37 ++++++++++++++++++--
 mParticle-Apple-SDK/Identity/MPIdentityApi.m | 21 +++++------
 2 files changed, 46 insertions(+), 12 deletions(-)

diff --git a/UnitTests/MPIdentityTests.m b/UnitTests/MPIdentityTests.m
index c7ee0baf7..653dde739 100644
--- a/UnitTests/MPIdentityTests.m
+++ b/UnitTests/MPIdentityTests.m
@@ -1023,8 +1023,17 @@ - (void)testAliasNilDates {
     NSDate *startTime = nil;
     NSDate *endTime = nil;
     MPAliasRequest *request = [MPAliasRequest requestWithSourceMPID:mpid1 destinationMPID:mpid2 startTime:startTime endTime:endTime];
+    XCTAssertEqual(request.sourceMPID, mpid1);
+    XCTAssertEqual(request.destinationMPID, mpid2);
+    XCTAssertFalse(request.startTime);
+    XCTAssertFalse(request.endTime);
+
     BOOL result = [MParticle.sharedInstance.identity aliasUsers:request];
-    XCTAssertFalse(result);
+    
+    XCTAssertTrue(request.startTime);
+    XCTAssertTrue(request.endTime);
+    XCTAssertTrue([request.startTime compare:request.endTime] == NSOrderedAscending);
+    XCTAssertTrue(result);
 }
 
 - (void)testAliasDatesReversed {
@@ -1033,8 +1042,20 @@ - (void)testAliasDatesReversed {
     NSDate *startTime = [NSDate dateWithTimeIntervalSince1970:200];
     NSDate *endTime = [NSDate dateWithTimeIntervalSince1970:100];
     MPAliasRequest *request = [MPAliasRequest requestWithSourceMPID:mpid1 destinationMPID:mpid2 startTime:startTime endTime:endTime];
+    XCTAssertEqual(request.sourceMPID, mpid1);
+    XCTAssertEqual(request.destinationMPID, mpid2);
+    XCTAssertEqual(request.startTime, startTime);
+    XCTAssertEqual(request.endTime, endTime);
+    XCTAssertTrue([request.startTime compare:request.endTime] != NSOrderedAscending);
+    
     BOOL result = [MParticle.sharedInstance.identity aliasUsers:request];
-    XCTAssertFalse(result);
+    
+    XCTAssertEqual(request.sourceMPID, mpid1);
+    XCTAssertEqual(request.destinationMPID, mpid2);
+    XCTAssertEqual(request.startTime, startTime);
+    XCTAssertEqual(request.endTime, endTime);
+    XCTAssertTrue([request.startTime compare:request.endTime] != NSOrderedAscending);
+    XCTAssertTrue(result);
 }
 
 - (void)testAliasValidData {
@@ -1043,7 +1064,19 @@ - (void)testAliasValidData {
     NSDate *startTime = [NSDate dateWithTimeIntervalSince1970:100];
     NSDate *endTime = [NSDate dateWithTimeIntervalSince1970:200];
     MPAliasRequest *request = [MPAliasRequest requestWithSourceMPID:mpid1 destinationMPID:mpid2 startTime:startTime endTime:endTime];
+    XCTAssertEqual(request.sourceMPID, mpid1);
+    XCTAssertEqual(request.destinationMPID, mpid2);
+    XCTAssertEqual(request.startTime, startTime);
+    XCTAssertEqual(request.endTime, endTime);
+    XCTAssertTrue([request.startTime compare:request.endTime] == NSOrderedAscending);
+    
     BOOL result = [MParticle.sharedInstance.identity aliasUsers:request];
+    
+    XCTAssertEqual(request.sourceMPID, mpid1);
+    XCTAssertEqual(request.destinationMPID, mpid2);
+    XCTAssertEqual(request.startTime, startTime);
+    XCTAssertEqual(request.endTime, endTime);
+    XCTAssertTrue([request.startTime compare:request.endTime] == NSOrderedAscending);
     XCTAssertTrue(result);
 }
 
diff --git a/mParticle-Apple-SDK/Identity/MPIdentityApi.m b/mParticle-Apple-SDK/Identity/MPIdentityApi.m
index cabde23cc..ab1876359 100644
--- a/mParticle-Apple-SDK/Identity/MPIdentityApi.m
+++ b/mParticle-Apple-SDK/Identity/MPIdentityApi.m
@@ -450,22 +450,23 @@ - (BOOL)aliasUsers:(MPAliasRequest *)aliasRequest {
         return NO;
     }
     
+    double maxDaysAgo = MParticle.sharedInstance.stateMachine.aliasMaxWindow ? MParticle.sharedInstance.stateMachine.aliasMaxWindow.doubleValue : 90;
+    double secondsPerDay = 60*60*24;
+    NSDate *oldestAllowableDate = [NSDate dateWithTimeIntervalSinceNow:-1*secondsPerDay*maxDaysAgo];
+    
     if (aliasRequest.usedFirstLastSeen) {
-        double maxDaysAgo = MParticle.sharedInstance.stateMachine.aliasMaxWindow.doubleValue;
-        double secondsPerDay = 60*60*24;
-        NSDate *oldestAllowableDate = [NSDate dateWithTimeIntervalSinceNow:-1*secondsPerDay*maxDaysAgo];
         if ([aliasRequest.startTime compare:oldestAllowableDate] == NSOrderedAscending) {
             aliasRequest.startTime = oldestAllowableDate;
         }
     }
     
-    if (aliasRequest.startTime == nil || aliasRequest.endTime == nil || [aliasRequest.startTime compare:aliasRequest.endTime] != NSOrderedAscending) {
-        if (!aliasRequest.usedFirstLastSeen) {
-            MPILogError(@"Invalid alias request - both start and end dates must exist and start date must occur before end date.");
-        } else {
-            MPILogError(@"Invalid alias request - Source User has not been seen in the last %@ days", MParticle.sharedInstance.stateMachine.aliasMaxWindow);
-        }
-        return NO;
+    if (aliasRequest.startTime == nil || aliasRequest.endTime == nil) {
+        aliasRequest.startTime = oldestAllowableDate;
+        aliasRequest.endTime = [NSDate dateWithTimeIntervalSinceNow:0];
+    }
+    
+    if ([aliasRequest.startTime compare:aliasRequest.endTime] != NSOrderedAscending) {
+        MPILogWarning(@"Invalid alias request - Start date must occur before end date. Alias Request will likely fail");
     }
     
     dispatch_async([MParticle messageQueue], ^{