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feat: sync billing header cc_version with User-Agent and add opt-in CCH signing

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- Sync cc_version in x-anthropic-billing-header with the fingerprint
  User-Agent version, preserving the message-derived suffix
- Implement xxHash64-based CCH signing to replace the cch=00000
  placeholder with a computed hash
- Add admin toggle (enable_cch_signing) under gateway forwarding settings,
  disabled by default
This commit is contained in:
shaw
2026-04-08 16:11:19 +08:00
parent 5088e91566
commit e51c9e50b5
12 changed files with 317 additions and 17 deletions
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2
backend/internal/service/domain_constants.go
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@@ -218,6 +218,8 @@ const (
SettingKeyEnableFingerprintUnification = "enable_fingerprint_unification"
// SettingKeyEnableMetadataPassthrough 是否透传客户端原始 metadata.user_id（默认 false）
SettingKeyEnableMetadataPassthrough = "enable_metadata_passthrough"
// SettingKeyEnableCCHSigning 是否对 billing header 中的 cch 进行 xxHash64 签名（默认 false）
SettingKeyEnableCCHSigning = "enable_cch_signing"
)
// AdminAPIKeyPrefix is the prefix for admin API keys (distinct from user "sk-" keys).