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Signing: added request time & eTag to signature verification#2309

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NachoSoto merged 2 commits into
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nacho/sdk-2914-update-signature-to-include-timestamp
Feb 27, 2023
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Signing: added request time & eTag to signature verification#2309
NachoSoto merged 2 commits into
mainfrom
nacho/sdk-2914-update-signature-to-include-timestamp

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@NachoSoto NachoSoto requested a review from a team February 21, 2023 20:10
@NachoSoto NachoSoto force-pushed the nacho/sdk-2914-update-signature-to-include-timestamp branch 3 times, most recently from 2e50d4a to 0b95ec2 Compare February 21, 2023 21:32

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No more special casing here 🎉

@NachoSoto NachoSoto force-pushed the nacho/sdk-2914-update-signature-to-include-timestamp branch from 0b95ec2 to 405c654 Compare February 21, 2023 22:55
@NachoSoto NachoSoto force-pushed the nacho/sdk-2878-rename-x-signature-header-and-change branch from bc30305 to 23b634b Compare February 22, 2023 17:13
@NachoSoto NachoSoto force-pushed the nacho/sdk-2914-update-signature-to-include-timestamp branch from 405c654 to d942c28 Compare February 22, 2023 17:13
@NachoSoto NachoSoto force-pushed the nacho/sdk-2878-rename-x-signature-header-and-change branch from 23b634b to 829afed Compare February 22, 2023 19:16
@NachoSoto NachoSoto force-pushed the nacho/sdk-2914-update-signature-to-include-timestamp branch from d942c28 to 0314391 Compare February 22, 2023 19:18
Base automatically changed from nacho/sdk-2878-rename-x-signature-header-and-change to main February 22, 2023 19:30
@NachoSoto NachoSoto force-pushed the nacho/sdk-2914-update-signature-to-include-timestamp branch 4 times, most recently from ba23046 to e228f72 Compare February 23, 2023 22:35
@NachoSoto NachoSoto marked this pull request as ready for review February 23, 2023 22:36
@codecov

codecov Bot commented Feb 23, 2023

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Codecov Report

Merging #2309 (e228f72) into main (a188b1e) will increase coverage by 0.09%.
The diff coverage is 100.00%.

❗ Current head e228f72 differs from pull request most recent head 59cdce7. Consider uploading reports for the commit 59cdce7 to get more accurate results

@@            Coverage Diff             @@
##             main    #2309      +/-   ##
==========================================
+ Coverage   86.31%   86.41%   +0.09%     
==========================================
  Files         187      187              
  Lines       12608    12633      +25     
==========================================
+ Hits        10883    10917      +34     
+ Misses       1725     1716       -9     
Impacted Files Coverage Δ
Sources/FoundationExtensions/Date+Extensions.swift 100.00% <100.00%> (ø)
Sources/Logging/Strings/SigningStrings.swift 95.00% <100.00%> (+1.25%) ⬆️
Sources/Misc/Signing+ResponseVerification.swift 97.56% <100.00%> (+0.22%) ⬆️
Sources/Misc/Signing.swift 89.36% <100.00%> (+1.40%) ⬆️
Sources/Networking/HTTPClient/ETagManager.swift 99.18% <100.00%> (ø)
Sources/Networking/HTTPClient/HTTPClient.swift 98.10% <100.00%> (ø)
Sources/Logging/Strings/PurchaseStrings.swift 87.89% <0.00%> (-0.53%) ⬇️
Sources/Error Handling/ErrorUtils.swift 85.87% <0.00%> (+1.12%) ⬆️
...rces/Purchasing/StoreKit1/ProductsFetcherSK1.swift 94.35% <0.00%> (+3.38%) ⬆️

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@tonidero tonidero left a comment

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Nice! Looks great!

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I like this refactor 👍

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Hmm I wonder if we should make the HTTPResponse.body parameter nullable instead of setting to an empty Data... We would have to guard against that later on but seems like a better representation? NABD though.

@NachoSoto NachoSoto Feb 27, 2023

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HTTPResponse is generic over its Body type.
Initially we do create an HTTPResponse<Data?>, and this method returns that, but Signing.verify takes a body as Data. I think it's simpler to deal with only one valid representation of an empty body.
This is the same thing with [], {}, "". Ideally the language allows a way to represent in the type system a value that can't be empty, but since we can't, I think it's better to make the parameter to Signing.verify non-optional so we don't have to handle both cases.

Comment thread Sources/Misc/Signing.swift Outdated

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Only log if signature is requested?

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This method starts with:

guard let nonce = request.nonce,
      let publicKey = publicKey,
      #available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.2, *) else {
    return .notVerified
}

So this won't be executed if there is no signature requested.

Comment thread Sources/Misc/Signing.swift Outdated
Comment on lines 195 to 196

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Given etag and message are exclusive, I would omit the etag from the signing parameters. For not modified responses the message IS the etag. That way you avoid having to have request-level logic in the signing code, gives you better abstraction IMHO. The signature for signature check should just be "local_nonce, server_timestamp, message, signature". And and leave the not-modified handling to the http request.

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Oh that's a great observation!
That was a nice small refactor, thanks: 59cdce7

Comment thread Tests/UnitTests/Misc/SigningTests.swift Outdated

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Include etag for the text. 200 responses will do have etag field.

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No longer relevant with the other refactor 👍🏻

@NachoSoto NachoSoto force-pushed the nacho/sdk-2914-update-signature-to-include-timestamp branch from e228f72 to 59cdce7 Compare February 27, 2023 16:58
@NachoSoto NachoSoto enabled auto-merge (squash) February 27, 2023 17:00
@NachoSoto NachoSoto merged commit b707f8a into main Feb 27, 2023
@NachoSoto NachoSoto deleted the nacho/sdk-2914-update-signature-to-include-timestamp branch February 27, 2023 17:07
This was referenced May 12, 2023
NachoSoto added a commit that referenced this pull request May 16, 2023
### New Features
* New `ErrorCode.signatureVerificationFailed` which will be used for an
upcoming feature

### Bugfixes
* `Purchases.deinit`: don't reset `Purchases.proxyURL` (#2346) via
NachoSoto (@NachoSoto)

<details>
<summary><b>Other Changes</b></summary>

* Introduced `Configuration.EntitlementVerificationMode` and
`VerificationResult` (#2277) via NachoSoto (@NachoSoto)
* `PurchasesDiagnostics`: added step to verify signature verification
(#2267) via NachoSoto (@NachoSoto)
* `HTTPClient`: added signature validation and introduced
`ErrorCode.signatureVerificationFailed` (#2272) via NachoSoto
(@NachoSoto)
* `ETagManager`: don't use ETags if response verification failed (#2347)
via NachoSoto (@NachoSoto)
* `Integration Tests`: removed `@preconcurrency import` (#2464) via
NachoSoto (@NachoSoto)
* Clean up: moved `ReceiptParserTests-Info.plist` out of root (#2460)
via NachoSoto (@NachoSoto)
* Update `CHANGELOG` (#2461) via NachoSoto (@NachoSoto)
* Update `SwiftSnapshotTesting` (#2453) via NachoSoto (@NachoSoto)
* Fixed docs (#2432) via Kaunteya Suryawanshi (@kaunteya)
* Remove unnecessary line break (#2435) via Andy Boedo (@aboedo)
* `ProductEntitlementMapping`: enabled entitlement mapping fetching
(#2425) via NachoSoto (@NachoSoto)
* `BackendPostReceiptDataTests`: increased timeout to fix flaky test
(#2426) via NachoSoto (@NachoSoto)
* Updated requirements to drop Xcode 13.x support (#2419) via NachoSoto
(@NachoSoto)
* `Integration Tests`: fixed flaky errors when loading offerings (#2420)
via NachoSoto (@NachoSoto)
* `PurchaseTester`: fixed compilation for `internal` entitlement
verification (#2417) via NachoSoto (@NachoSoto)
* `ETagManager`/`HTTPClient`: sending new `X-RC-Last-Refresh-Time`
header (#2373) via NachoSoto (@NachoSoto)
* `ETagManager`: don't send validation time if not present (#2490) via
NachoSoto (@NachoSoto)
* SwiftUI Sample Project: Refactor Package terms method to a computed
property (#2405) via Joseph Kokenge (@JOyo246)
* Clean up v3 load shedder integration tests (#2402) via Andy Boedo
(@aboedo)
* Fix iOS 12 compilation (#2394) via NachoSoto (@NachoSoto)
* Added new `VerificationResult.verifiedOnDevice` (#2379) via NachoSoto
(@NachoSoto)
* `PurchaseTester`: fix memory leaks (#2392) via Keita Watanabe
(@kitwtnb)
* Integration tests: add scheduled job (#2389) via Andy Boedo (@aboedo)
* Add lane for running iOS v3 load shedder integration tests (#2388) via
Andy Boedo (@aboedo)
* iOS v3 load shedder integration tests (#2387) via Andy Boedo (@aboedo)
* `Offline Entitlements`: created `LoadShedderIntegrationTests` (#2362)
via NachoSoto (@NachoSoto)
* Purchases.configure: log warning if attempting to use a static
appUserID (#2385) via Mark Villacampa (@MarkVillacampa)
* `SubscriberAttributesManagerIntegrationTests`: fixed flaky failures
(#2381) via NachoSoto (@NachoSoto)
* `@DefaultDecodable.Now`: fixed flaky test (#2374) via NachoSoto
(@NachoSoto)
* `PurchaseTesterSwiftUI`: fixed iOS compilation (#2376) via NachoSoto
(@NachoSoto)
* `SubscriberAttributesManagerIntegrationTests`: fixed potential race
condition (#2380) via NachoSoto (@NachoSoto)
* `Offline Entitlements`: create `CustomerInfo` from offline
entitlements (#2358) via NachoSoto (@NachoSoto)
* Added `@DefaultDecodable.Now` (#2372) via NachoSoto (@NachoSoto)
* `HTTPClient`: debug log when performing redirects (#2371) via
NachoSoto (@NachoSoto)
* `HTTPClient`: new flag to force server errors (#2370) via NachoSoto
(@NachoSoto)
* `OfferingsManager`: fixed Xcode 13.x build (#2369) via NachoSoto
(@NachoSoto)
* `Offline Entitlements`: store `ProductEntitlementMapping` in cache
(#2355) via NachoSoto (@NachoSoto)
* `Offline Entitlements`: added support for fetching
`ProductEntitlementMappingResponse` in `OfflineEntitlementsAPI` (#2353)
via NachoSoto (@NachoSoto)
* `Offline Entitlements`: created `ProductEntitlementMapping` (#2365)
via NachoSoto (@NachoSoto)
* Implemented `NetworkError.isServerDown` (#2367) via NachoSoto
(@NachoSoto)
* `ETagManager`: added test for 304 responses with no etag (#2360) via
NachoSoto (@NachoSoto)
* `TestLogHandler`: increased default capacity (#2357) via NachoSoto
(@NachoSoto)
* `OfferingsManager`: moved log to common method to remove hardcoded
string (#2363) via NachoSoto (@NachoSoto)
* `Offline Entitlements`: created `ProductEntitlementMappingResponse`
(#2351) via NachoSoto (@NachoSoto)
* `HTTPClient`: added test for 2xx response for request with etag
(#2361) via NachoSoto (@NachoSoto)
* `PurchaseTesterSwiftUI` improvements (#2345) via NachoSoto
(@NachoSoto)
* `ConfigureStrings`: fixed double-space typo (#2344) via NachoSoto
(@NachoSoto)
* `ETagManagerTests`: fixed tests on iOS 12 (#2349) via NachoSoto
(@NachoSoto)
* `DeviceCache`: simplified constructor (#2354) via NachoSoto
(@NachoSoto)
* `Trusted Entitlements`: changed all APIs to `internal` (#2350) via
NachoSoto (@NachoSoto)
* `VerificationResult.notRequested`: removed caching reference (#2337)
via NachoSoto (@NachoSoto)
* Finished signature verification `HTTPClient` tests (#2333) via
NachoSoto (@NachoSoto)
* `Configuration.Builder.with(entitlementVerificationMode:)`: improved
documentation (#2334) via NachoSoto (@NachoSoto)
* `ETagManager`: don't ignore failed etags with
`Signing.VerificationMode.informational` (#2331) via NachoSoto
(@NachoSoto)
* `IdentityManager`: clear `ETagManager` and `DeviceCache` if
verification is enabled but cached `CustomerInfo` is not (#2330) via
NachoSoto (@NachoSoto)
* Made `Configuration.EntitlementVerificationMode.enforced` unavailable
(#2329) via NachoSoto (@NachoSoto)
* Refactor: reorganized files in new Security and Misc folders (#2326)
via NachoSoto (@NachoSoto)
* `CustomerInfo`: use same grace period logic for active subscriptions
(#2327) via NachoSoto (@NachoSoto)
* `HTTPClient`: don't verify 4xx/5xx responses (#2322) via NachoSoto
(@NachoSoto)
* `EntitlementInfo`: request date is not optional (#2325) via NachoSoto
(@NachoSoto)
* `CustomerInfo`: removed `entitlementVerification` (#2320) via
NachoSoto (@NachoSoto)
* Renamed `VerificationResult.notVerified` to `.notRequested` (#2321)
via NachoSoto (@NachoSoto)
* `EntitlementInfo`: add a grace period limit to outdated entitlements
(#2288) via NachoSoto (@NachoSoto)
* Update `CustomerInfo.requestDate` from 304 responses (#2310) via
NachoSoto (@NachoSoto)
* `Signing`: added request time & eTag to signature verification (#2309)
via NachoSoto (@NachoSoto)
* `HTTPClient`: changed header search to be case-insensitive (#2308) via
NachoSoto (@NachoSoto)
* `HTTPClient`: automatically add `nonce` based on `HTTPRequest.Path`
(#2286) via NachoSoto (@NachoSoto)
* `PurchaseTester`: added ability to reload `CustomerInfo` with a custom
`CacheFetchPolicy` (#2312) via NachoSoto (@NachoSoto)
* Fix issue where underlying error information for product fetch errors
was not printed in log. (#2281) via Chris Vasselli (@chrisvasselli)
* `PurchaseTester`: added ability to set
`Configuration.EntitlementVerificationMode` (#2290) via NachoSoto
(@NachoSoto)
* SwiftUI: Paywall View should respond to changes on the UserView model
(#2297) via ConfusedVorlon (@ConfusedVorlon)
* Deprecate `usesStoreKit2IfAvailable` (#2293) via Andy Boedo (@aboedo)
* `Signing`: updated to use production public key (#2274) via NachoSoto
(@NachoSoto)
</details>

---------

Co-authored-by: RCGitBot <dev+RCGitBot@revenuecat.com>
NachoSoto added a commit to NachoSoto/purchases-ios that referenced this pull request May 17, 2023
### New Features
* New `ErrorCode.signatureVerificationFailed` which will be used for an
upcoming feature

### Bugfixes
* `Purchases.deinit`: don't reset `Purchases.proxyURL` (RevenueCat#2346) via
NachoSoto (@NachoSoto)

<details>
<summary><b>Other Changes</b></summary>

* Introduced `Configuration.EntitlementVerificationMode` and
`VerificationResult` (RevenueCat#2277) via NachoSoto (@NachoSoto)
* `PurchasesDiagnostics`: added step to verify signature verification
(RevenueCat#2267) via NachoSoto (@NachoSoto)
* `HTTPClient`: added signature validation and introduced
`ErrorCode.signatureVerificationFailed` (RevenueCat#2272) via NachoSoto
(@NachoSoto)
* `ETagManager`: don't use ETags if response verification failed (RevenueCat#2347)
via NachoSoto (@NachoSoto)
* `Integration Tests`: removed `@preconcurrency import` (RevenueCat#2464) via
NachoSoto (@NachoSoto)
* Clean up: moved `ReceiptParserTests-Info.plist` out of root (RevenueCat#2460)
via NachoSoto (@NachoSoto)
* Update `CHANGELOG` (RevenueCat#2461) via NachoSoto (@NachoSoto)
* Update `SwiftSnapshotTesting` (RevenueCat#2453) via NachoSoto (@NachoSoto)
* Fixed docs (RevenueCat#2432) via Kaunteya Suryawanshi (@kaunteya)
* Remove unnecessary line break (RevenueCat#2435) via Andy Boedo (@aboedo)
* `ProductEntitlementMapping`: enabled entitlement mapping fetching
(RevenueCat#2425) via NachoSoto (@NachoSoto)
* `BackendPostReceiptDataTests`: increased timeout to fix flaky test
(RevenueCat#2426) via NachoSoto (@NachoSoto)
* Updated requirements to drop Xcode 13.x support (RevenueCat#2419) via NachoSoto
(@NachoSoto)
* `Integration Tests`: fixed flaky errors when loading offerings (RevenueCat#2420)
via NachoSoto (@NachoSoto)
* `PurchaseTester`: fixed compilation for `internal` entitlement
verification (RevenueCat#2417) via NachoSoto (@NachoSoto)
* `ETagManager`/`HTTPClient`: sending new `X-RC-Last-Refresh-Time`
header (RevenueCat#2373) via NachoSoto (@NachoSoto)
* `ETagManager`: don't send validation time if not present (RevenueCat#2490) via
NachoSoto (@NachoSoto)
* SwiftUI Sample Project: Refactor Package terms method to a computed
property (RevenueCat#2405) via Joseph Kokenge (@JOyo246)
* Clean up v3 load shedder integration tests (RevenueCat#2402) via Andy Boedo
(@aboedo)
* Fix iOS 12 compilation (RevenueCat#2394) via NachoSoto (@NachoSoto)
* Added new `VerificationResult.verifiedOnDevice` (RevenueCat#2379) via NachoSoto
(@NachoSoto)
* `PurchaseTester`: fix memory leaks (RevenueCat#2392) via Keita Watanabe
(@kitwtnb)
* Integration tests: add scheduled job (RevenueCat#2389) via Andy Boedo (@aboedo)
* Add lane for running iOS v3 load shedder integration tests (RevenueCat#2388) via
Andy Boedo (@aboedo)
* iOS v3 load shedder integration tests (RevenueCat#2387) via Andy Boedo (@aboedo)
* `Offline Entitlements`: created `LoadShedderIntegrationTests` (RevenueCat#2362)
via NachoSoto (@NachoSoto)
* Purchases.configure: log warning if attempting to use a static
appUserID (RevenueCat#2385) via Mark Villacampa (@MarkVillacampa)
* `SubscriberAttributesManagerIntegrationTests`: fixed flaky failures
(RevenueCat#2381) via NachoSoto (@NachoSoto)
* `@DefaultDecodable.Now`: fixed flaky test (RevenueCat#2374) via NachoSoto
(@NachoSoto)
* `PurchaseTesterSwiftUI`: fixed iOS compilation (RevenueCat#2376) via NachoSoto
(@NachoSoto)
* `SubscriberAttributesManagerIntegrationTests`: fixed potential race
condition (RevenueCat#2380) via NachoSoto (@NachoSoto)
* `Offline Entitlements`: create `CustomerInfo` from offline
entitlements (RevenueCat#2358) via NachoSoto (@NachoSoto)
* Added `@DefaultDecodable.Now` (RevenueCat#2372) via NachoSoto (@NachoSoto)
* `HTTPClient`: debug log when performing redirects (RevenueCat#2371) via
NachoSoto (@NachoSoto)
* `HTTPClient`: new flag to force server errors (RevenueCat#2370) via NachoSoto
(@NachoSoto)
* `OfferingsManager`: fixed Xcode 13.x build (RevenueCat#2369) via NachoSoto
(@NachoSoto)
* `Offline Entitlements`: store `ProductEntitlementMapping` in cache
(RevenueCat#2355) via NachoSoto (@NachoSoto)
* `Offline Entitlements`: added support for fetching
`ProductEntitlementMappingResponse` in `OfflineEntitlementsAPI` (RevenueCat#2353)
via NachoSoto (@NachoSoto)
* `Offline Entitlements`: created `ProductEntitlementMapping` (RevenueCat#2365)
via NachoSoto (@NachoSoto)
* Implemented `NetworkError.isServerDown` (RevenueCat#2367) via NachoSoto
(@NachoSoto)
* `ETagManager`: added test for 304 responses with no etag (RevenueCat#2360) via
NachoSoto (@NachoSoto)
* `TestLogHandler`: increased default capacity (RevenueCat#2357) via NachoSoto
(@NachoSoto)
* `OfferingsManager`: moved log to common method to remove hardcoded
string (RevenueCat#2363) via NachoSoto (@NachoSoto)
* `Offline Entitlements`: created `ProductEntitlementMappingResponse`
(RevenueCat#2351) via NachoSoto (@NachoSoto)
* `HTTPClient`: added test for 2xx response for request with etag
(RevenueCat#2361) via NachoSoto (@NachoSoto)
* `PurchaseTesterSwiftUI` improvements (RevenueCat#2345) via NachoSoto
(@NachoSoto)
* `ConfigureStrings`: fixed double-space typo (RevenueCat#2344) via NachoSoto
(@NachoSoto)
* `ETagManagerTests`: fixed tests on iOS 12 (RevenueCat#2349) via NachoSoto
(@NachoSoto)
* `DeviceCache`: simplified constructor (RevenueCat#2354) via NachoSoto
(@NachoSoto)
* `Trusted Entitlements`: changed all APIs to `internal` (RevenueCat#2350) via
NachoSoto (@NachoSoto)
* `VerificationResult.notRequested`: removed caching reference (RevenueCat#2337)
via NachoSoto (@NachoSoto)
* Finished signature verification `HTTPClient` tests (RevenueCat#2333) via
NachoSoto (@NachoSoto)
* `Configuration.Builder.with(entitlementVerificationMode:)`: improved
documentation (RevenueCat#2334) via NachoSoto (@NachoSoto)
* `ETagManager`: don't ignore failed etags with
`Signing.VerificationMode.informational` (RevenueCat#2331) via NachoSoto
(@NachoSoto)
* `IdentityManager`: clear `ETagManager` and `DeviceCache` if
verification is enabled but cached `CustomerInfo` is not (RevenueCat#2330) via
NachoSoto (@NachoSoto)
* Made `Configuration.EntitlementVerificationMode.enforced` unavailable
(RevenueCat#2329) via NachoSoto (@NachoSoto)
* Refactor: reorganized files in new Security and Misc folders (RevenueCat#2326)
via NachoSoto (@NachoSoto)
* `CustomerInfo`: use same grace period logic for active subscriptions
(RevenueCat#2327) via NachoSoto (@NachoSoto)
* `HTTPClient`: don't verify 4xx/5xx responses (RevenueCat#2322) via NachoSoto
(@NachoSoto)
* `EntitlementInfo`: request date is not optional (RevenueCat#2325) via NachoSoto
(@NachoSoto)
* `CustomerInfo`: removed `entitlementVerification` (RevenueCat#2320) via
NachoSoto (@NachoSoto)
* Renamed `VerificationResult.notVerified` to `.notRequested` (RevenueCat#2321)
via NachoSoto (@NachoSoto)
* `EntitlementInfo`: add a grace period limit to outdated entitlements
(RevenueCat#2288) via NachoSoto (@NachoSoto)
* Update `CustomerInfo.requestDate` from 304 responses (RevenueCat#2310) via
NachoSoto (@NachoSoto)
* `Signing`: added request time & eTag to signature verification (RevenueCat#2309)
via NachoSoto (@NachoSoto)
* `HTTPClient`: changed header search to be case-insensitive (RevenueCat#2308) via
NachoSoto (@NachoSoto)
* `HTTPClient`: automatically add `nonce` based on `HTTPRequest.Path`
(RevenueCat#2286) via NachoSoto (@NachoSoto)
* `PurchaseTester`: added ability to reload `CustomerInfo` with a custom
`CacheFetchPolicy` (RevenueCat#2312) via NachoSoto (@NachoSoto)
* Fix issue where underlying error information for product fetch errors
was not printed in log. (RevenueCat#2281) via Chris Vasselli (@chrisvasselli)
* `PurchaseTester`: added ability to set
`Configuration.EntitlementVerificationMode` (RevenueCat#2290) via NachoSoto
(@NachoSoto)
* SwiftUI: Paywall View should respond to changes on the UserView model
(RevenueCat#2297) via ConfusedVorlon (@ConfusedVorlon)
* Deprecate `usesStoreKit2IfAvailable` (RevenueCat#2293) via Andy Boedo (@aboedo)
* `Signing`: updated to use production public key (RevenueCat#2274) via NachoSoto
(@NachoSoto)
</details>

---------

Co-authored-by: RCGitBot <dev+RCGitBot@revenuecat.com>
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3 participants