harukaandClaude Opus 4.8
6cfb7898df
Recent Claude Code CLI versions no longer emit the cch=... signature field in their x-anthropic-billing-header system block (issue #3358). sub2api still injected cch=00000 when mimicking Claude Code for OAuth accounts and optionally signed it, so mimicked requests now diverge from real CLI traffic — the opposite of what the mimicry is for. - buildBillingAttributionText emits the block without the cch=00000 segment; cc_version + cc_entrypoint=cli are kept (detection and Anthropic's first-party signal rely on the block, not on cch). - Retire signing: remove the two enableCCH signBillingHeaderCCH call sites in buildUpstreamRequest / buildCountTokensRequest and delete the now-dead signBillingHeaderCCH, cchPlaceholderRe, cchSeed, xxHash64Seeded helpers. - enable_cch_signing is now a documented no-op (kept for backward compat). - Drop the obsolete signing tests (TestSignBillingHeaderCCH, TestXXHash64Seeded, TestSanitizeMustBeBeforeCCHSigning_HashConsistency) and update the prompt test to assert the injected block no longer carries cch=. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
49 lines
1.4 KiB
Go
49 lines
1.4 KiB
Go
package service
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import (
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"fmt"
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"regexp"
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"strings"
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"github.com/tidwall/gjson"
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"github.com/tidwall/sjson"
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)
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// ccVersionInBillingRe matches the semver part of cc_version (X.Y.Z), preserving
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// the trailing message-derived suffix (e.g. ".c02") if present.
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var ccVersionInBillingRe = regexp.MustCompile(`cc_version=\d+\.\d+\.\d+`)
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// syncBillingHeaderVersion rewrites cc_version in x-anthropic-billing-header
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// system text blocks to match the version extracted from userAgent.
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// Only touches system array blocks whose text starts with "x-anthropic-billing-header".
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func syncBillingHeaderVersion(body []byte, userAgent string) []byte {
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version := ExtractCLIVersion(userAgent)
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if version == "" {
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return body
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}
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systemResult := gjson.GetBytes(body, "system")
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if !systemResult.Exists() || !systemResult.IsArray() {
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return body
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}
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replacement := "cc_version=" + version
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idx := 0
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systemResult.ForEach(func(_, item gjson.Result) bool {
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text := item.Get("text")
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if text.Exists() && text.Type == gjson.String &&
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strings.HasPrefix(text.String(), "x-anthropic-billing-header") {
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newText := ccVersionInBillingRe.ReplaceAllString(text.String(), replacement)
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if newText != text.String() {
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if updated, err := sjson.SetBytes(body, fmt.Sprintf("system.%d.text", idx), newText); err == nil {
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body = updated
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}
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}
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}
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idx++
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return true
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})
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return body
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}
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