fix: add platform to chunk envelope item headers (#5041)

Author: armcknight

Sources/Sentry/Profiling/SentryProfilerSerialization.mm

@@ -342,6 +342,7 @@
     const auto header =
         [[SentryEnvelopeItemHeader alloc] initWithType:SentryEnvelopeItemTypeProfileChunk
                                                 length:JSONData.length];
+    header.platform = @"cocoa";
     const auto envelopeItem = [[SentryEnvelopeItem alloc] initWithHeader:header data:JSONData];
 
     return [[SentryEnvelope alloc] initWithId:chunkID singleItem:envelopeItem];

Sources/Sentry/Public/SentryEnvelopeItemHeader.h

@@ -28,6 +28,12 @@ SENTRY_NO_INIT
 @property (nonatomic, readonly, copy, nullable) NSString *filename;
 @property (nonatomic, readonly, copy, nullable) NSString *contentType;
 
+/**
+ * Some envelopes need to report the platform name for enhanced rate limiting functionality in
+ * relay.
+ */
+@property (nonatomic, copy, nullable) NSString *platform;
+
 @end
 
 NS_ASSUME_NONNULL_END

Sources/Sentry/SentryEnvelopeItemHeader.m

@@ -48,6 +48,10 @@ - (NSDictionary *)serialize
         [target setValue:self.contentType forKey:@"content_type"];
     }
 
+    if (self.platform) {
+        [target setValue:self.contentType forKey:@"platform"];
+    }
+
     [target setValue:[NSNumber numberWithUnsignedInteger:self.length] forKey:@"length"];
 
     return target;

Tests/SentryProfilerTests/SentryContinuousProfilerTests.swift

@@ -242,6 +242,7 @@ private extension SentryContinuousProfilerTests {
         XCTAssertEqual(1, envelope.items.count)
         let profileItem = try XCTUnwrap(envelope.items.first)
         XCTAssertEqual("profile_chunk", profileItem.header.type)
+        XCTAssertEqual("cocoa", profileItem.header.platform)
         let data = profileItem.data
         let profile = try XCTUnwrap(try JSONSerialization.jsonObject(with: data) as? [String: Any])