Fix lint and style errors

[ikimonogakari]

Found minor lint errors.

• metadata/decode.go
  • chain is nil when accessing its 0 index item. Create a new slice to avoid nil access.
• protocol/attestation_apple.go
  • err has been checked not nil in the preceding if statement, and cannot be nil again.
• Some style errors, need a space after // comment.

[coderabbitai]

Walkthrough

This pull request introduces several modifications across multiple files, primarily focusing on error handling and formatting adjustments. Notably, the DecodeBytes method in metadata/decode.go has been updated to ensure proper initialization of the chain variable when the HeaderX509Certificate attribute is absent. In protocol/attestation_apple.go, an error check related to nonce verification has been removed, simplifying the control flow. Minor formatting changes were made in protocol/client.go and protocol/options.go, primarily to improve comment clarity. The overall functionality and logic of the affected components remain unchanged.

Changes

File	Change Summary
metadata/decode.go	Modified DecodeBytes to initialize chain as a slice containing d.root when HeaderX509Certificate is missing.
protocol/attestation_androidkey_test.go	Commented out code in TestVerifyAndroidKeyFormat that checked equality of got1 and tt.want1 using reflect.DeepEqual.
protocol/attestation_apple.go	Removed error check in verifyAppleFormat for nonce verification after asn1.Unmarshal, simplifying the condition.
protocol/client.go	Minor formatting adjustments and clarified comments in the CollectedClientData struct.
protocol/options.go	Minor formatting adjustments in comments for AttestationFormatPacked constant.

Possibly related PRs

• feat(metadata)!: rework as a provider #239: The changes in the metadata/decode.go file regarding the DecodeBytes method and the handling of the chain variable are related to the overall rework of metadata handling proposed in this PR, which includes modifications to how metadata is parsed and validated.

Poem

🐰 In the meadow where code does play,
Changes hop in a bright new way.
Chains are set, errors are few,
With comments clear, we’ll see it through.
A dance of logic, a waltz of code,
In the rabbit's burrow, new paths unfold! 🌼

---

📜 Recent review details

Configuration used: CodeRabbit UI
Review profile: CHILL

📥 Commits

Reviewing files that changed from the base of the PR and between e817853 and 20af933.

📒 Files selected for processing (5)

• metadata/decode.go (1 hunks)
• protocol/attestation_androidkey_test.go (1 hunks)
• protocol/attestation_apple.go (1 hunks)
• protocol/client.go (1 hunks)
• protocol/options.go (1 hunks)

✅ Files skipped from review due to trivial changes (2)

• protocol/client.go
• protocol/options.go

🧰 Additional context used

🪛 golangci-lint

protocol/attestation_androidkey_test.go

61-61: File is not goimports-ed with -local github.com/go-webauthn/webauthn

(goimports)

🔇 Additional comments (2)

protocol/attestation_apple.go (1)

80-80: LGTM! Simplified condition is correct.

The removal of the redundant error check is appropriate since any potential asn1.Unmarshal errors are already handled in the preceding lines (78-79). This change improves code clarity without compromising safety.

metadata/decode.go (1)

112-112: LGTM: Proper slice initialization improves code safety.

The change correctly initializes the chain slice when the x5c header is missing, which is safer than direct index assignment. This ensures proper certificate chain validation when falling back to the metadata TOC signing trust anchor.

Let's verify the certificate chain validation logic remains intact:

✅ Verification successful

Slice initialization change is correct and maintains chain validation integrity

The code change properly handles the fallback case when x5c is missing by initializing the certificate chain with the root certificate. The surrounding context shows that:

1. The chain validation logic remains intact with proper validation against the metadata TOC signing trust anchor
2. The chain is correctly used for subsequent certificate parsing and validation
3. The change maintains the expected behavior while improving code safety

🏁 Scripts executed

The following scripts were executed for the analysis:

Script:

#!/bin/bash
# Description: Verify that certificate chain validation is properly tested
# Test: Search for test cases covering missing x5c header scenario
rg -A 10 "TestDecode.*" --type go

Length of output: 35

---

Script:

#!/bin/bash
# Let's try a broader search for test files and certificate chain validation tests
fd ".*_test.go$" --exec rg -l "x5c|chain|certificate"

# Also search for the decode implementation to understand the chain validation
rg -A 10 "func.*DecodeBytes" --type go

Length of output: 922

---

Script:

#!/bin/bash
# Let's examine the full context of the decode implementation and chain validation
rg -B 5 -A 20 "chain\s*=.*\[\]any" metadata/decode.go

# Also search for any related test cases in the metadata package
fd "metadata/.*_test.go$" --exec rg -l "TestDecode|x5c|chain"

Length of output: 993

---

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