Anthropic API proxy with OAuth credential rotation and Claude Code fingerprinting
Sniffs a real Claude Code request on startup to capture exact HTTP headers, then replays them for all proxied requests. Injects the billing header with per-request SHA256 fingerprint into the system prompt. Uses utls with Chrome TLS fingerprint to pass Cloudflare's bot detection on api.anthropic.com. Supports both streaming (SSE) and non-streaming modes, round-robin credential selection with automatic failover, and loading OAuth tokens from both cli-proxy-api auth files and native ~/.claude/.credentials.json.
This commit is contained in:
Alexander
@@ -0,0 +1,4 @@
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.go/
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.direnv/
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anthropic-proxy
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result
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Generated
+61
@@ -0,0 +1,61 @@
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{
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"nodes": {
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"flake-utils": {
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"inputs": {
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"systems": "systems"
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},
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"locked": {
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"lastModified": 1731533236,
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"narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
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"owner": "numtide",
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"repo": "flake-utils",
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"rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
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"type": "github"
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},
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"original": {
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"owner": "numtide",
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"repo": "flake-utils",
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"type": "github"
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}
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},
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"nixpkgs": {
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"locked": {
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"lastModified": 1775423009,
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"narHash": "sha256-vPKLpjhIVWdDrfiUM8atW6YkIggCEKdSAlJPzzhkQlw=",
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"owner": "NixOS",
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"repo": "nixpkgs",
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"rev": "68d8aa3d661f0e6bd5862291b5bb263b2a6595c9",
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"type": "github"
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},
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"original": {
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"owner": "NixOS",
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"ref": "nixos-unstable",
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"repo": "nixpkgs",
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"type": "github"
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}
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},
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"root": {
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"inputs": {
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"flake-utils": "flake-utils",
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"nixpkgs": "nixpkgs"
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}
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},
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"systems": {
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"locked": {
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"lastModified": 1681028828,
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"narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
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"owner": "nix-systems",
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"repo": "default",
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"rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
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"type": "github"
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},
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"original": {
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"owner": "nix-systems",
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"repo": "default",
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"type": "github"
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}
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}
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},
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"root": "root",
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"version": 7
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}
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@@ -0,0 +1,47 @@
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{
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description = "Anthropic API proxy with OAuth key rotation";
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inputs = {
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nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
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flake-utils.url = "github:numtide/flake-utils";
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};
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outputs =
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{
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self,
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nixpkgs,
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flake-utils,
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}:
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flake-utils.lib.eachDefaultSystem (
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system:
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let
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pkgs = import nixpkgs {
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inherit system;
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config.allowUnfreePredicate =
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pkg:
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builtins.elem (pkgs.lib.getName pkg) [
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"claude-code"
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];
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};
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in
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{
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devShells.default = pkgs.mkShell {
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buildInputs = with pkgs; [
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go
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gopls
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gotools
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go-tools
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delve
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curl
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jq
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claude-code
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];
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shellHook = ''
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export GOPATH="$PWD/.go"
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export PATH="$GOPATH/bin:$PATH"
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'';
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};
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}
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);
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}
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@@ -0,0 +1,48 @@
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module github.com/fujin/anthropic-proxy
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go 1.26
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require (
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github.com/gin-gonic/gin v1.12.0
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github.com/google/uuid v1.6.0
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github.com/tidwall/gjson v1.18.0
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gopkg.in/yaml.v3 v3.0.1
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)
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require (
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github.com/andybalholm/brotli v1.0.6 // indirect
|
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github.com/bytedance/gopkg v0.1.3 // indirect
|
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github.com/bytedance/sonic v1.15.0 // indirect
|
||||
github.com/bytedance/sonic/loader v0.5.0 // indirect
|
||||
github.com/cloudwego/base64x v0.1.6 // indirect
|
||||
github.com/gabriel-vasile/mimetype v1.4.12 // indirect
|
||||
github.com/gin-contrib/sse v1.1.0 // indirect
|
||||
github.com/go-playground/locales v0.14.1 // indirect
|
||||
github.com/go-playground/universal-translator v0.18.1 // indirect
|
||||
github.com/go-playground/validator/v10 v10.30.1 // indirect
|
||||
github.com/goccy/go-json v0.10.5 // indirect
|
||||
github.com/goccy/go-yaml v1.19.2 // indirect
|
||||
github.com/json-iterator/go v1.1.12 // indirect
|
||||
github.com/klauspost/compress v1.17.6 // indirect
|
||||
github.com/klauspost/cpuid/v2 v2.3.0 // indirect
|
||||
github.com/leodido/go-urn v1.4.0 // indirect
|
||||
github.com/mattn/go-isatty v0.0.20 // indirect
|
||||
github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
|
||||
github.com/modern-go/reflect2 v1.0.2 // indirect
|
||||
github.com/pelletier/go-toml/v2 v2.2.4 // indirect
|
||||
github.com/quic-go/qpack v0.6.0 // indirect
|
||||
github.com/quic-go/quic-go v0.59.0 // indirect
|
||||
github.com/refraction-networking/utls v1.8.2 // indirect
|
||||
github.com/tidwall/match v1.1.1 // indirect
|
||||
github.com/tidwall/pretty v1.2.0 // indirect
|
||||
github.com/tidwall/sjson v1.2.5 // indirect
|
||||
github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
|
||||
github.com/ugorji/go/codec v1.3.1 // indirect
|
||||
go.mongodb.org/mongo-driver/v2 v2.5.0 // indirect
|
||||
golang.org/x/arch v0.22.0 // indirect
|
||||
golang.org/x/crypto v0.49.0 // indirect
|
||||
golang.org/x/net v0.52.0 // indirect
|
||||
golang.org/x/sys v0.42.0 // indirect
|
||||
golang.org/x/text v0.35.0 // indirect
|
||||
google.golang.org/protobuf v1.36.10 // indirect
|
||||
)
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@@ -0,0 +1,122 @@
|
||||
github.com/andybalholm/brotli v1.0.6 h1:Yf9fFpf49Zrxb9NlQaluyE92/+X7UVHlhMNJN2sxfOI=
|
||||
github.com/andybalholm/brotli v1.0.6/go.mod h1:fO7iG3H7G2nSZ7m0zPUDn85XEX2GTukHGRSepvi9Eig=
|
||||
github.com/bytedance/gopkg v0.1.3 h1:TPBSwH8RsouGCBcMBktLt1AymVo2TVsBVCY4b6TnZ/M=
|
||||
github.com/bytedance/gopkg v0.1.3/go.mod h1:576VvJ+eJgyCzdjS+c4+77QF3p7ubbtiKARP3TxducM=
|
||||
github.com/bytedance/sonic v1.15.0 h1:/PXeWFaR5ElNcVE84U0dOHjiMHQOwNIx3K4ymzh/uSE=
|
||||
github.com/bytedance/sonic v1.15.0/go.mod h1:tFkWrPz0/CUCLEF4ri4UkHekCIcdnkqXw9VduqpJh0k=
|
||||
github.com/bytedance/sonic/loader v0.5.0 h1:gXH3KVnatgY7loH5/TkeVyXPfESoqSBSBEiDd5VjlgE=
|
||||
github.com/bytedance/sonic/loader v0.5.0/go.mod h1:AR4NYCk5DdzZizZ5djGqQ92eEhCCcdf5x77udYiSJRo=
|
||||
github.com/cloudwego/base64x v0.1.6 h1:t11wG9AECkCDk5fMSoxmufanudBtJ+/HemLstXDLI2M=
|
||||
github.com/cloudwego/base64x v0.1.6/go.mod h1:OFcloc187FXDaYHvrNIjxSe8ncn0OOM8gEHfghB2IPU=
|
||||
github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
|
||||
github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
|
||||
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
|
||||
github.com/gabriel-vasile/mimetype v1.4.12 h1:e9hWvmLYvtp846tLHam2o++qitpguFiYCKbn0w9jyqw=
|
||||
github.com/gabriel-vasile/mimetype v1.4.12/go.mod h1:d+9Oxyo1wTzWdyVUPMmXFvp4F9tea18J8ufA774AB3s=
|
||||
github.com/gin-contrib/sse v1.1.0 h1:n0w2GMuUpWDVp7qSpvze6fAu9iRxJY4Hmj6AmBOU05w=
|
||||
github.com/gin-contrib/sse v1.1.0/go.mod h1:hxRZ5gVpWMT7Z0B0gSNYqqsSCNIJMjzvm6fqCz9vjwM=
|
||||
github.com/gin-gonic/gin v1.12.0 h1:b3YAbrZtnf8N//yjKeU2+MQsh2mY5htkZidOM7O0wG8=
|
||||
github.com/gin-gonic/gin v1.12.0/go.mod h1:VxccKfsSllpKshkBWgVgRniFFAzFb9csfngsqANjnLc=
|
||||
github.com/go-playground/assert/v2 v2.2.0 h1:JvknZsQTYeFEAhQwI4qEt9cyV5ONwRHC+lYKSsYSR8s=
|
||||
github.com/go-playground/assert/v2 v2.2.0/go.mod h1:VDjEfimB/XKnb+ZQfWdccd7VUvScMdVu0Titje2rxJ4=
|
||||
github.com/go-playground/locales v0.14.1 h1:EWaQ/wswjilfKLTECiXz7Rh+3BjFhfDFKv/oXslEjJA=
|
||||
github.com/go-playground/locales v0.14.1/go.mod h1:hxrqLVvrK65+Rwrd5Fc6F2O76J/NuW9t0sjnWqG1slY=
|
||||
github.com/go-playground/universal-translator v0.18.1 h1:Bcnm0ZwsGyWbCzImXv+pAJnYK9S473LQFuzCbDbfSFY=
|
||||
github.com/go-playground/universal-translator v0.18.1/go.mod h1:xekY+UJKNuX9WP91TpwSH2VMlDf28Uj24BCp08ZFTUY=
|
||||
github.com/go-playground/validator/v10 v10.30.1 h1:f3zDSN/zOma+w6+1Wswgd9fLkdwy06ntQJp0BBvFG0w=
|
||||
github.com/go-playground/validator/v10 v10.30.1/go.mod h1:oSuBIQzuJxL//3MelwSLD5hc2Tu889bF0Idm9Dg26cM=
|
||||
github.com/goccy/go-json v0.10.5 h1:Fq85nIqj+gXn/S5ahsiTlK3TmC85qgirsdTP/+DeaC4=
|
||||
github.com/goccy/go-json v0.10.5/go.mod h1:oq7eo15ShAhp70Anwd5lgX2pLfOS3QCiwU/PULtXL6M=
|
||||
github.com/goccy/go-yaml v1.19.2 h1:PmFC1S6h8ljIz6gMRBopkjP1TVT7xuwrButHID66PoM=
|
||||
github.com/goccy/go-yaml v1.19.2/go.mod h1:XBurs7gK8ATbW4ZPGKgcbrY1Br56PdM69F7LkFRi1kA=
|
||||
github.com/google/go-cmp v0.7.0 h1:wk8382ETsv4JYUZwIsn6YpYiWiBsYLSJiTsyBybVuN8=
|
||||
github.com/google/go-cmp v0.7.0/go.mod h1:pXiqmnSA92OHEEa9HXL2W4E7lf9JzCmGVUdgjX3N/iU=
|
||||
github.com/google/gofuzz v1.0.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
|
||||
github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
|
||||
github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
|
||||
github.com/json-iterator/go v1.1.12 h1:PV8peI4a0ysnczrg+LtxykD8LfKY9ML6u2jnxaEnrnM=
|
||||
github.com/json-iterator/go v1.1.12/go.mod h1:e30LSqwooZae/UwlEbR2852Gd8hjQvJoHmT4TnhNGBo=
|
||||
github.com/klauspost/compress v1.17.6 h1:60eq2E/jlfwQXtvZEeBUYADs+BwKBWURIY+Gj2eRGjI=
|
||||
github.com/klauspost/compress v1.17.6/go.mod h1:/dCuZOvVtNoHsyb+cuJD3itjs3NbnF6KH9zAO4BDxPM=
|
||||
github.com/klauspost/cpuid/v2 v2.3.0 h1:S4CRMLnYUhGeDFDqkGriYKdfoFlDnMtqTiI/sFzhA9Y=
|
||||
github.com/klauspost/cpuid/v2 v2.3.0/go.mod h1:hqwkgyIinND0mEev00jJYCxPNVRVXFQeu1XKlok6oO0=
|
||||
github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
|
||||
github.com/kr/pretty v0.3.1/go.mod h1:hoEshYVHaxMs3cyo3Yncou5ZscifuDolrwPKZanG3xk=
|
||||
github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
|
||||
github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
|
||||
github.com/leodido/go-urn v1.4.0 h1:WT9HwE9SGECu3lg4d/dIA+jxlljEa1/ffXKmRjqdmIQ=
|
||||
github.com/leodido/go-urn v1.4.0/go.mod h1:bvxc+MVxLKB4z00jd1z+Dvzr47oO32F/QSNjSBOlFxI=
|
||||
github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWEY=
|
||||
github.com/mattn/go-isatty v0.0.20/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
|
||||
github.com/modern-go/concurrent v0.0.0-20180228061459-e0a39a4cb421/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=
|
||||
github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd h1:TRLaZ9cD/w8PVh93nsPXa1VrQ6jlwL5oN8l14QlcNfg=
|
||||
github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=
|
||||
github.com/modern-go/reflect2 v1.0.2 h1:xBagoLtFs94CBntxluKeaWgTMpvLxC4ur3nMaC9Gz0M=
|
||||
github.com/modern-go/reflect2 v1.0.2/go.mod h1:yWuevngMOJpCy52FWWMvUC8ws7m/LJsjYzDa0/r8luk=
|
||||
github.com/pelletier/go-toml/v2 v2.2.4 h1:mye9XuhQ6gvn5h28+VilKrrPoQVanw5PMw/TB0t5Ec4=
|
||||
github.com/pelletier/go-toml/v2 v2.2.4/go.mod h1:2gIqNv+qfxSVS7cM2xJQKtLSTLUE9V8t9Stt+h56mCY=
|
||||
github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
|
||||
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
|
||||
github.com/quic-go/qpack v0.6.0 h1:g7W+BMYynC1LbYLSqRt8PBg5Tgwxn214ZZR34VIOjz8=
|
||||
github.com/quic-go/qpack v0.6.0/go.mod h1:lUpLKChi8njB4ty2bFLX2x4gzDqXwUpaO1DP9qMDZII=
|
||||
github.com/quic-go/quic-go v0.59.0 h1:OLJkp1Mlm/aS7dpKgTc6cnpynnD2Xg7C1pwL6vy/SAw=
|
||||
github.com/quic-go/quic-go v0.59.0/go.mod h1:upnsH4Ju1YkqpLXC305eW3yDZ4NfnNbmQRCMWS58IKU=
|
||||
github.com/refraction-networking/utls v1.8.2 h1:j4Q1gJj0xngdeH+Ox/qND11aEfhpgoEvV+S9iJ2IdQo=
|
||||
github.com/refraction-networking/utls v1.8.2/go.mod h1:jkSOEkLqn+S/jtpEHPOsVv/4V4EVnelwbMQl4vCWXAM=
|
||||
github.com/rogpeppe/go-internal v1.10.0 h1:TMyTOH3F/DB16zRVcYyreMH6GnZZrwQVAoYjRBZyWFQ=
|
||||
github.com/rogpeppe/go-internal v1.10.0/go.mod h1:UQnix2H7Ngw/k4C5ijL5+65zddjncjaFoBhdsK/akog=
|
||||
github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
|
||||
github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
|
||||
github.com/stretchr/objx v0.5.0/go.mod h1:Yh+to48EsGEfYuaHDzXPcE3xhTkx73EhmCGUpEOglKo=
|
||||
github.com/stretchr/objx v0.5.2/go.mod h1:FRsXN1f5AsAjCGJKqEizvkpNtU+EGNCLh3NxZ/8L+MA=
|
||||
github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
|
||||
github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
|
||||
github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
|
||||
github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
|
||||
github.com/stretchr/testify v1.10.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
|
||||
github.com/stretchr/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu7U=
|
||||
github.com/stretchr/testify v1.11.1/go.mod h1:wZwfW3scLgRK+23gO65QZefKpKQRnfz6sD981Nm4B6U=
|
||||
github.com/tidwall/gjson v1.14.2/go.mod h1:/wbyibRr2FHMks5tjHJ5F8dMZh3AcwJEMf5vlfC0lxk=
|
||||
github.com/tidwall/gjson v1.18.0 h1:FIDeeyB800efLX89e5a8Y0BNH+LOngJyGrIWxG2FKQY=
|
||||
github.com/tidwall/gjson v1.18.0/go.mod h1:/wbyibRr2FHMks5tjHJ5F8dMZh3AcwJEMf5vlfC0lxk=
|
||||
github.com/tidwall/match v1.1.1 h1:+Ho715JplO36QYgwN9PGYNhgZvoUSc9X2c80KVTi+GA=
|
||||
github.com/tidwall/match v1.1.1/go.mod h1:eRSPERbgtNPcGhD8UCthc6PmLEQXEWd3PRB5JTxsfmM=
|
||||
github.com/tidwall/pretty v1.2.0 h1:RWIZEg2iJ8/g6fDDYzMpobmaoGh5OLl4AXtGUGPcqCs=
|
||||
github.com/tidwall/pretty v1.2.0/go.mod h1:ITEVvHYasfjBbM0u2Pg8T2nJnzm8xPwvNhhsoaGGjNU=
|
||||
github.com/tidwall/sjson v1.2.5 h1:kLy8mja+1c9jlljvWTlSazM7cKDRfJuR/bOJhcY5NcY=
|
||||
github.com/tidwall/sjson v1.2.5/go.mod h1:Fvgq9kS/6ociJEDnK0Fk1cpYF4FIW6ZF7LAe+6jwd28=
|
||||
github.com/twitchyliquid64/golang-asm v0.15.1 h1:SU5vSMR7hnwNxj24w34ZyCi/FmDZTkS4MhqMhdFk5YI=
|
||||
github.com/twitchyliquid64/golang-asm v0.15.1/go.mod h1:a1lVb/DtPvCB8fslRZhAngC2+aY1QWCk3Cedj/Gdt08=
|
||||
github.com/ugorji/go/codec v1.3.1 h1:waO7eEiFDwidsBN6agj1vJQ4AG7lh2yqXyOXqhgQuyY=
|
||||
github.com/ugorji/go/codec v1.3.1/go.mod h1:pRBVtBSKl77K30Bv8R2P+cLSGaTtex6fsA2Wjqmfxj4=
|
||||
go.mongodb.org/mongo-driver/v2 v2.5.0 h1:yXUhImUjjAInNcpTcAlPHiT7bIXhshCTL3jVBkF3xaE=
|
||||
go.mongodb.org/mongo-driver/v2 v2.5.0/go.mod h1:yOI9kBsufol30iFsl1slpdq1I0eHPzybRWdyYUs8K/0=
|
||||
go.uber.org/mock v0.6.0 h1:hyF9dfmbgIX5EfOdasqLsWD6xqpNZlXblLB/Dbnwv3Y=
|
||||
go.uber.org/mock v0.6.0/go.mod h1:KiVJ4BqZJaMj4svdfmHM0AUx4NJYO8ZNpPnZn1Z+BBU=
|
||||
golang.org/x/arch v0.22.0 h1:c/Zle32i5ttqRXjdLyyHZESLD/bB90DCU1g9l/0YBDI=
|
||||
golang.org/x/arch v0.22.0/go.mod h1:dNHoOeKiyja7GTvF9NJS1l3Z2yntpQNzgrjh1cU103A=
|
||||
golang.org/x/crypto v0.48.0 h1:/VRzVqiRSggnhY7gNRxPauEQ5Drw9haKdM0jqfcCFts=
|
||||
golang.org/x/crypto v0.48.0/go.mod h1:r0kV5h3qnFPlQnBSrULhlsRfryS2pmewsg+XfMgkVos=
|
||||
golang.org/x/crypto v0.49.0 h1:+Ng2ULVvLHnJ/ZFEq4KdcDd/cfjrrjjNSXNzxg0Y4U4=
|
||||
golang.org/x/crypto v0.49.0/go.mod h1:ErX4dUh2UM+CFYiXZRTcMpEcN8b/1gxEuv3nODoYtCA=
|
||||
golang.org/x/net v0.51.0 h1:94R/GTO7mt3/4wIKpcR5gkGmRLOuE/2hNGeWq/GBIFo=
|
||||
golang.org/x/net v0.51.0/go.mod h1:aamm+2QF5ogm02fjy5Bb7CQ0WMt1/WVM7FtyaTLlA9Y=
|
||||
golang.org/x/net v0.52.0 h1:He/TN1l0e4mmR3QqHMT2Xab3Aj3L9qjbhRm78/6jrW0=
|
||||
golang.org/x/net v0.52.0/go.mod h1:R1MAz7uMZxVMualyPXb+VaqGSa3LIaUqk0eEt3w36Sw=
|
||||
golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
|
||||
golang.org/x/sys v0.41.0 h1:Ivj+2Cp/ylzLiEU89QhWblYnOE9zerudt9Ftecq2C6k=
|
||||
golang.org/x/sys v0.41.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks=
|
||||
golang.org/x/sys v0.42.0 h1:omrd2nAlyT5ESRdCLYdm3+fMfNFE/+Rf4bDIQImRJeo=
|
||||
golang.org/x/sys v0.42.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=
|
||||
golang.org/x/text v0.34.0 h1:oL/Qq0Kdaqxa1KbNeMKwQq0reLCCaFtqu2eNuSeNHbk=
|
||||
golang.org/x/text v0.34.0/go.mod h1:homfLqTYRFyVYemLBFl5GgL/DWEiH5wcsQ5gSh1yziA=
|
||||
golang.org/x/text v0.35.0 h1:JOVx6vVDFokkpaq1AEptVzLTpDe9KGpj5tR4/X+ybL8=
|
||||
golang.org/x/text v0.35.0/go.mod h1:khi/HExzZJ2pGnjenulevKNX1W67CUy0AsXcNubPGCA=
|
||||
google.golang.org/protobuf v1.36.10 h1:AYd7cD/uASjIL6Q9LiTjz8JLcrh/88q5UObnmY3aOOE=
|
||||
google.golang.org/protobuf v1.36.10/go.mod h1:HTf+CrKn2C3g5S8VImy6tdcUvCska2kB7j23XfzDpco=
|
||||
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
|
||||
gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
|
||||
gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
|
||||
gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
|
||||
gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
|
||||
gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
|
||||
@@ -0,0 +1,109 @@
|
||||
package auth
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"context"
|
||||
"encoding/json"
|
||||
"fmt"
|
||||
"net/http"
|
||||
"os"
|
||||
"time"
|
||||
)
|
||||
|
||||
const (
|
||||
tokenEndpoint = "https://api.anthropic.com/v1/oauth/token"
|
||||
clientID = "9d1c250a-e61b-44d9-88ed-5944d1962f5e"
|
||||
)
|
||||
|
||||
type tokenRequest struct {
|
||||
ClientID string `json:"client_id"`
|
||||
GrantType string `json:"grant_type"`
|
||||
RefreshToken string `json:"refresh_token"`
|
||||
}
|
||||
|
||||
type tokenResponse struct {
|
||||
AccessToken string `json:"access_token"`
|
||||
RefreshToken string `json:"refresh_token"`
|
||||
ExpiresIn int `json:"expires_in"`
|
||||
Account struct {
|
||||
EmailAddress string `json:"email_address"`
|
||||
} `json:"account"`
|
||||
}
|
||||
|
||||
type authFileJSON struct {
|
||||
AccessToken string `json:"access_token"`
|
||||
RefreshToken string `json:"refresh_token"`
|
||||
Email string `json:"email"`
|
||||
Expired string `json:"expired"`
|
||||
Type string `json:"type"`
|
||||
}
|
||||
|
||||
// RefreshToken performs an OAuth token refresh for the given credential.
|
||||
func RefreshToken(ctx context.Context, cred *Credential) error {
|
||||
reqBody := tokenRequest{
|
||||
ClientID: clientID,
|
||||
GrantType: "refresh_token",
|
||||
RefreshToken: cred.RefreshToken,
|
||||
}
|
||||
|
||||
body, err := json.Marshal(reqBody)
|
||||
if err != nil {
|
||||
return fmt.Errorf("marshal refresh request: %w", err)
|
||||
}
|
||||
|
||||
req, err := http.NewRequestWithContext(ctx, http.MethodPost, tokenEndpoint, bytes.NewReader(body))
|
||||
if err != nil {
|
||||
return fmt.Errorf("create refresh request: %w", err)
|
||||
}
|
||||
req.Header.Set("Content-Type", "application/json")
|
||||
|
||||
resp, err := http.DefaultClient.Do(req)
|
||||
if err != nil {
|
||||
return fmt.Errorf("execute refresh request: %w", err)
|
||||
}
|
||||
defer resp.Body.Close()
|
||||
|
||||
if resp.StatusCode != http.StatusOK {
|
||||
return fmt.Errorf("refresh failed with status %d", resp.StatusCode)
|
||||
}
|
||||
|
||||
var tokenResp tokenResponse
|
||||
if err := json.NewDecoder(resp.Body).Decode(&tokenResp); err != nil {
|
||||
return fmt.Errorf("decode refresh response: %w", err)
|
||||
}
|
||||
|
||||
cred.mu.Lock()
|
||||
cred.AccessToken = tokenResp.AccessToken
|
||||
cred.RefreshToken = tokenResp.RefreshToken
|
||||
cred.ExpiresAt = time.Now().Add(time.Duration(tokenResp.ExpiresIn) * time.Second)
|
||||
if tokenResp.Account.EmailAddress != "" {
|
||||
cred.Email = tokenResp.Account.EmailAddress
|
||||
}
|
||||
cred.mu.Unlock()
|
||||
|
||||
return persistCredential(cred)
|
||||
}
|
||||
|
||||
func persistCredential(cred *Credential) error {
|
||||
cred.mu.Lock()
|
||||
data := authFileJSON{
|
||||
AccessToken: cred.AccessToken,
|
||||
RefreshToken: cred.RefreshToken,
|
||||
Email: cred.Email,
|
||||
Expired: cred.ExpiresAt.Format(time.RFC3339),
|
||||
Type: "claude",
|
||||
}
|
||||
filePath := cred.FilePath
|
||||
cred.mu.Unlock()
|
||||
|
||||
out, err := json.MarshalIndent(data, "", " ")
|
||||
if err != nil {
|
||||
return fmt.Errorf("marshal auth file: %w", err)
|
||||
}
|
||||
|
||||
if err := os.WriteFile(filePath, out, 0600); err != nil {
|
||||
return fmt.Errorf("write auth file %s: %w", filePath, err)
|
||||
}
|
||||
|
||||
return nil
|
||||
}
|
||||
@@ -0,0 +1,79 @@
|
||||
package auth
|
||||
|
||||
import (
|
||||
"context"
|
||||
"fmt"
|
||||
"log"
|
||||
"sync"
|
||||
"time"
|
||||
)
|
||||
|
||||
type Pool struct {
|
||||
creds []*Credential
|
||||
cursor int
|
||||
mu sync.Mutex
|
||||
}
|
||||
|
||||
func NewPool(creds []*Credential) *Pool {
|
||||
return &Pool{creds: creds}
|
||||
}
|
||||
|
||||
func (p *Pool) Pick() (*Credential, error) {
|
||||
p.mu.Lock()
|
||||
defer p.mu.Unlock()
|
||||
|
||||
n := len(p.creds)
|
||||
if n == 0 {
|
||||
return nil, fmt.Errorf("no credentials available")
|
||||
}
|
||||
|
||||
for i := 0; i < n; i++ {
|
||||
idx := (p.cursor + i) % n
|
||||
cred := p.creds[idx]
|
||||
if !cred.IsOnCooldown() {
|
||||
p.cursor = (idx + 1) % n
|
||||
return cred, nil
|
||||
}
|
||||
}
|
||||
|
||||
return nil, fmt.Errorf("all %d credentials are on cooldown", n)
|
||||
}
|
||||
|
||||
func (p *Pool) MarkFailure(cred *Credential, statusCode int) {
|
||||
switch {
|
||||
case statusCode == 429:
|
||||
cred.SetCooldown(30 * time.Second)
|
||||
case statusCode >= 500:
|
||||
cred.SetCooldown(5 * time.Second)
|
||||
}
|
||||
}
|
||||
|
||||
func (p *Pool) MarkSuccess(cred *Credential) {
|
||||
cred.mu.Lock()
|
||||
defer cred.mu.Unlock()
|
||||
cred.CooldownUntil = time.Time{}
|
||||
}
|
||||
|
||||
func (p *Pool) RefreshExpiring(ctx context.Context) {
|
||||
p.mu.Lock()
|
||||
creds := make([]*Credential, len(p.creds))
|
||||
copy(creds, p.creds)
|
||||
p.mu.Unlock()
|
||||
|
||||
threshold := time.Now().Add(5 * time.Minute)
|
||||
for _, cred := range creds {
|
||||
cred.mu.Lock()
|
||||
needsRefresh := cred.ExpiresAt.Before(threshold)
|
||||
email := cred.Email
|
||||
cred.mu.Unlock()
|
||||
|
||||
if needsRefresh {
|
||||
log.Printf("refreshing token for %s (expires %s)", email, cred.ExpiresAt.Format(time.RFC3339))
|
||||
if err := RefreshToken(ctx, cred); err != nil {
|
||||
log.Printf("failed to refresh token for %s: %v", email, err)
|
||||
} else {
|
||||
log.Printf("refreshed token for %s, new expiry %s", email, cred.ExpiresAt.Format(time.RFC3339))
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,46 @@
|
||||
package auth
|
||||
|
||||
import (
|
||||
"sync"
|
||||
"time"
|
||||
)
|
||||
|
||||
// Credential represents an Anthropic API credential loaded from a JSON file.
|
||||
type Credential struct {
|
||||
ID string
|
||||
Email string
|
||||
AccessToken string
|
||||
RefreshToken string
|
||||
ExpiresAt time.Time
|
||||
FilePath string
|
||||
CooldownUntil time.Time
|
||||
mu sync.Mutex
|
||||
}
|
||||
|
||||
// IsExpired returns true if the credential's access token has expired.
|
||||
func (c *Credential) IsExpired() bool {
|
||||
c.mu.Lock()
|
||||
defer c.mu.Unlock()
|
||||
return time.Now().After(c.ExpiresAt)
|
||||
}
|
||||
|
||||
// IsOnCooldown returns true if the credential is currently on cooldown.
|
||||
func (c *Credential) IsOnCooldown() bool {
|
||||
c.mu.Lock()
|
||||
defer c.mu.Unlock()
|
||||
return time.Now().Before(c.CooldownUntil)
|
||||
}
|
||||
|
||||
// SetCooldown puts the credential on cooldown for the given duration.
|
||||
func (c *Credential) SetCooldown(duration time.Duration) {
|
||||
c.mu.Lock()
|
||||
defer c.mu.Unlock()
|
||||
c.CooldownUntil = time.Now().Add(duration)
|
||||
}
|
||||
|
||||
// Token returns the current access token.
|
||||
func (c *Credential) Token() string {
|
||||
c.mu.Lock()
|
||||
defer c.mu.Unlock()
|
||||
return c.AccessToken
|
||||
}
|
||||
@@ -0,0 +1,147 @@
|
||||
package config
|
||||
|
||||
import (
|
||||
"encoding/json"
|
||||
"fmt"
|
||||
"os"
|
||||
"path/filepath"
|
||||
"time"
|
||||
|
||||
"github.com/fujin/anthropic-proxy/internal/auth"
|
||||
"gopkg.in/yaml.v3"
|
||||
)
|
||||
|
||||
type Config struct {
|
||||
Port int `yaml:"port"`
|
||||
APIKeys []string `yaml:"api_keys"`
|
||||
AuthDir string `yaml:"auth_dir"`
|
||||
ClaudeCredentials string `yaml:"claude_credentials"`
|
||||
ClaudeBinary string `yaml:"claude_binary"`
|
||||
}
|
||||
|
||||
type authFileJSON struct {
|
||||
AccessToken string `json:"access_token"`
|
||||
RefreshToken string `json:"refresh_token"`
|
||||
Email string `json:"email"`
|
||||
Expired string `json:"expired"`
|
||||
Type string `json:"type"`
|
||||
}
|
||||
|
||||
type claudeCredentialsJSON struct {
|
||||
ClaudeAiOauth struct {
|
||||
AccessToken string `json:"accessToken"`
|
||||
RefreshToken string `json:"refreshToken"`
|
||||
ExpiresAt int64 `json:"expiresAt"`
|
||||
SubscriptionType string `json:"subscriptionType"`
|
||||
} `json:"claudeAiOauth"`
|
||||
}
|
||||
|
||||
func Load(path string) (*Config, error) {
|
||||
data, err := os.ReadFile(path)
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("read config %s: %w", path, err)
|
||||
}
|
||||
|
||||
cfg := &Config{Port: 8080}
|
||||
if err := yaml.Unmarshal(data, cfg); err != nil {
|
||||
return nil, fmt.Errorf("parse config: %w", err)
|
||||
}
|
||||
|
||||
return cfg, nil
|
||||
}
|
||||
|
||||
func LoadCredentials(cfg *Config) ([]*auth.Credential, error) {
|
||||
var creds []*auth.Credential
|
||||
|
||||
if cfg.ClaudeCredentials != "" {
|
||||
cred, err := loadClaudeCredentials(cfg.ClaudeCredentials)
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("load claude credentials: %w", err)
|
||||
}
|
||||
creds = append(creds, cred)
|
||||
}
|
||||
|
||||
if cfg.AuthDir != "" {
|
||||
dirCreds, err := loadAuthDir(cfg.AuthDir)
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("load auth dir: %w", err)
|
||||
}
|
||||
creds = append(creds, dirCreds...)
|
||||
}
|
||||
|
||||
return creds, nil
|
||||
}
|
||||
|
||||
func loadClaudeCredentials(path string) (*auth.Credential, error) {
|
||||
data, err := os.ReadFile(path)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
var cf claudeCredentialsJSON
|
||||
if err := json.Unmarshal(data, &cf); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
oauth := cf.ClaudeAiOauth
|
||||
if oauth.AccessToken == "" {
|
||||
return nil, fmt.Errorf("no access token in %s", path)
|
||||
}
|
||||
|
||||
return &auth.Credential{
|
||||
ID: "claude-native",
|
||||
Email: oauth.SubscriptionType,
|
||||
AccessToken: oauth.AccessToken,
|
||||
RefreshToken: oauth.RefreshToken,
|
||||
ExpiresAt: time.UnixMilli(oauth.ExpiresAt),
|
||||
FilePath: path,
|
||||
}, nil
|
||||
}
|
||||
|
||||
func loadAuthDir(authDir string) ([]*auth.Credential, error) {
|
||||
pattern := filepath.Join(authDir, "*.json")
|
||||
files, err := filepath.Glob(pattern)
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("glob auth files: %w", err)
|
||||
}
|
||||
|
||||
var creds []*auth.Credential
|
||||
for _, f := range files {
|
||||
cred, err := loadAuthFile(f)
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("load auth file %s: %w", f, err)
|
||||
}
|
||||
creds = append(creds, cred)
|
||||
}
|
||||
|
||||
return creds, nil
|
||||
}
|
||||
|
||||
func loadAuthFile(path string) (*auth.Credential, error) {
|
||||
data, err := os.ReadFile(path)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
var af authFileJSON
|
||||
if err := json.Unmarshal(data, &af); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
expiresAt, err := time.Parse(time.RFC3339, af.Expired)
|
||||
if err != nil {
|
||||
expiresAt, err = time.Parse("2006-01-02T15:04:05", af.Expired)
|
||||
if err != nil {
|
||||
expiresAt = time.Now()
|
||||
}
|
||||
}
|
||||
|
||||
return &auth.Credential{
|
||||
ID: filepath.Base(path),
|
||||
Email: af.Email,
|
||||
AccessToken: af.AccessToken,
|
||||
RefreshToken: af.RefreshToken,
|
||||
ExpiresAt: expiresAt,
|
||||
FilePath: path,
|
||||
}, nil
|
||||
}
|
||||
@@ -0,0 +1,90 @@
|
||||
package proxy
|
||||
|
||||
import (
|
||||
"crypto/sha256"
|
||||
"encoding/hex"
|
||||
"encoding/json"
|
||||
"fmt"
|
||||
"unicode/utf16"
|
||||
|
||||
"github.com/tidwall/gjson"
|
||||
"github.com/tidwall/sjson"
|
||||
)
|
||||
|
||||
const fingerprintSalt = "59cf53e54c78"
|
||||
|
||||
func computeFingerprint(firstUserMessage string, version string) string {
|
||||
indices := []int{4, 7, 20}
|
||||
runes := utf16.Encode([]rune(firstUserMessage))
|
||||
var chars string
|
||||
for _, i := range indices {
|
||||
if i < len(runes) {
|
||||
chars += string(rune(runes[i]))
|
||||
} else {
|
||||
chars += "0"
|
||||
}
|
||||
}
|
||||
input := fingerprintSalt + chars + version
|
||||
hash := sha256.Sum256([]byte(input))
|
||||
return hex.EncodeToString(hash[:])[:3]
|
||||
}
|
||||
|
||||
func extractFirstUserMessage(body []byte) string {
|
||||
messages := gjson.GetBytes(body, "messages")
|
||||
if !messages.Exists() || !messages.IsArray() {
|
||||
return ""
|
||||
}
|
||||
for _, msg := range messages.Array() {
|
||||
if msg.Get("role").String() != "user" {
|
||||
continue
|
||||
}
|
||||
content := msg.Get("content")
|
||||
if content.Type == gjson.String {
|
||||
return content.String()
|
||||
}
|
||||
if content.IsArray() {
|
||||
for _, block := range content.Array() {
|
||||
if block.Get("type").String() == "text" {
|
||||
return block.Get("text").String()
|
||||
}
|
||||
}
|
||||
}
|
||||
break
|
||||
}
|
||||
return ""
|
||||
}
|
||||
|
||||
func buildBillingHeader(body []byte, version string) string {
|
||||
userMsg := extractFirstUserMessage(body)
|
||||
fp := computeFingerprint(userMsg, version)
|
||||
return fmt.Sprintf("x-anthropic-billing-header: cc_version=%s.%s; cc_entrypoint=cli; cch=00000;", version, fp)
|
||||
}
|
||||
|
||||
func injectBillingHeader(body []byte, version string) []byte {
|
||||
header := buildBillingHeader(body, version)
|
||||
billingBlock := map[string]interface{}{"type": "text", "text": header}
|
||||
billingJSON, _ := json.Marshal(billingBlock)
|
||||
|
||||
existing := gjson.GetBytes(body, "system")
|
||||
if !existing.Exists() {
|
||||
body, _ = sjson.SetRawBytes(body, "system", []byte("["+string(billingJSON)+"]"))
|
||||
return body
|
||||
}
|
||||
|
||||
if existing.IsArray() {
|
||||
items := make([]json.RawMessage, 0, len(existing.Array())+1)
|
||||
items = append(items, billingJSON)
|
||||
for _, item := range existing.Array() {
|
||||
items = append(items, json.RawMessage(item.Raw))
|
||||
}
|
||||
systemJSON, _ := json.Marshal(items)
|
||||
body, _ = sjson.SetRawBytes(body, "system", systemJSON)
|
||||
return body
|
||||
}
|
||||
|
||||
origText := existing.String()
|
||||
origBlock := map[string]string{"type": "text", "text": origText}
|
||||
origJSON, _ := json.Marshal(origBlock)
|
||||
body, _ = sjson.SetRawBytes(body, "system", []byte("["+string(billingJSON)+","+string(origJSON)+"]"))
|
||||
return body
|
||||
}
|
||||
@@ -0,0 +1,107 @@
|
||||
package proxy
|
||||
|
||||
import (
|
||||
"bufio"
|
||||
"io"
|
||||
"log"
|
||||
"net/http"
|
||||
|
||||
"github.com/gin-gonic/gin"
|
||||
"github.com/tidwall/gjson"
|
||||
|
||||
"github.com/fujin/anthropic-proxy/internal/auth"
|
||||
)
|
||||
|
||||
func HandleMessages(pool *auth.Pool, profile *SniffedProfile) gin.HandlerFunc {
|
||||
upstream := NewUpstreamClient(profile)
|
||||
|
||||
return func(c *gin.Context) {
|
||||
body, err := io.ReadAll(c.Request.Body)
|
||||
if err != nil {
|
||||
c.JSON(http.StatusBadRequest, gin.H{"error": "failed to read request body"})
|
||||
return
|
||||
}
|
||||
|
||||
cred, err := pool.Pick()
|
||||
if err != nil {
|
||||
c.JSON(http.StatusServiceUnavailable, gin.H{"error": err.Error()})
|
||||
return
|
||||
}
|
||||
|
||||
isStream := gjson.GetBytes(body, "stream").Bool()
|
||||
|
||||
if isStream {
|
||||
handleStream(c, upstream, pool, cred, body)
|
||||
} else {
|
||||
handleNonStream(c, upstream, pool, cred, body)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func handleNonStream(c *gin.Context, upstream *UpstreamClient, pool *auth.Pool, cred *auth.Credential, body []byte) {
|
||||
respBody, headers, statusCode, err := upstream.Execute(c.Request.Context(), cred, body)
|
||||
if err != nil {
|
||||
log.Printf("upstream error for %s: %v", cred.Email, err)
|
||||
c.JSON(http.StatusBadGateway, gin.H{"error": "upstream request failed"})
|
||||
return
|
||||
}
|
||||
|
||||
if statusCode >= 400 {
|
||||
pool.MarkFailure(cred, statusCode)
|
||||
log.Printf("upstream %d for %s", statusCode, cred.Email)
|
||||
} else {
|
||||
pool.MarkSuccess(cred)
|
||||
}
|
||||
|
||||
for _, h := range []string{"Content-Type", "X-Request-Id"} {
|
||||
if v := headers.Get(h); v != "" {
|
||||
c.Header(h, v)
|
||||
}
|
||||
}
|
||||
|
||||
c.Data(statusCode, headers.Get("Content-Type"), respBody)
|
||||
}
|
||||
|
||||
func handleStream(c *gin.Context, upstream *UpstreamClient, pool *auth.Pool, cred *auth.Credential, body []byte) {
|
||||
resp, err := upstream.ExecuteStream(c.Request.Context(), cred, body)
|
||||
if err != nil {
|
||||
log.Printf("upstream stream error for %s: %v", cred.Email, err)
|
||||
c.JSON(http.StatusBadGateway, gin.H{"error": "upstream stream request failed"})
|
||||
return
|
||||
}
|
||||
defer resp.Body.Close()
|
||||
|
||||
if resp.StatusCode >= 400 {
|
||||
pool.MarkFailure(cred, resp.StatusCode)
|
||||
log.Printf("upstream stream %d for %s", resp.StatusCode, cred.Email)
|
||||
respBody, _ := io.ReadAll(resp.Body)
|
||||
c.Data(resp.StatusCode, resp.Header.Get("Content-Type"), respBody)
|
||||
return
|
||||
}
|
||||
|
||||
pool.MarkSuccess(cred)
|
||||
|
||||
c.Header("Content-Type", "text/event-stream")
|
||||
c.Header("Cache-Control", "no-cache")
|
||||
c.Header("Connection", "keep-alive")
|
||||
c.Status(http.StatusOK)
|
||||
|
||||
flusher, ok := c.Writer.(http.Flusher)
|
||||
if !ok {
|
||||
log.Printf("response writer does not support flushing")
|
||||
c.JSON(http.StatusInternalServerError, gin.H{"error": "streaming not supported"})
|
||||
return
|
||||
}
|
||||
|
||||
scanner := bufio.NewScanner(resp.Body)
|
||||
scanner.Buffer(make([]byte, 0, 64*1024), 1024*1024)
|
||||
for scanner.Scan() {
|
||||
line := scanner.Text()
|
||||
c.Writer.WriteString(line + "\n")
|
||||
flusher.Flush()
|
||||
}
|
||||
|
||||
if err := scanner.Err(); err != nil {
|
||||
log.Printf("stream scan error: %v", err)
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,193 @@
|
||||
package proxy
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
"io"
|
||||
"log"
|
||||
"net"
|
||||
"net/http"
|
||||
"os/exec"
|
||||
"strings"
|
||||
"sync"
|
||||
"time"
|
||||
|
||||
"github.com/tidwall/gjson"
|
||||
)
|
||||
|
||||
// SniffedProfile holds everything captured from a real Claude Code request.
|
||||
// The proxy replays these verbatim — no hardcoded values needed.
|
||||
type SniffedProfile struct {
|
||||
// Raw headers exactly as Claude Code sent them (name→value).
|
||||
// Excludes only host, content-length, and auth (we substitute our own token).
|
||||
Headers [][2]string
|
||||
|
||||
// The full request body with system prompt, tools, metadata, thinking config, etc.
|
||||
// We swap out model + messages from the incoming client request.
|
||||
Body []byte
|
||||
|
||||
// Parsed from User-Agent for billing header fingerprint computation.
|
||||
Version string
|
||||
}
|
||||
|
||||
var skipHeaders = map[string]bool{
|
||||
"host": true,
|
||||
"content-length": true,
|
||||
"authorization": true,
|
||||
"x-api-key": true,
|
||||
"connection": true,
|
||||
}
|
||||
|
||||
func SniffClaudeCode(claudeBinary string) (*SniffedProfile, error) {
|
||||
listener, err := net.Listen("tcp", "127.0.0.1:0")
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("listen: %w", err)
|
||||
}
|
||||
port := listener.Addr().(*net.TCPAddr).Port
|
||||
|
||||
var profile *SniffedProfile
|
||||
var mu sync.Mutex
|
||||
captured := make(chan struct{}, 1)
|
||||
|
||||
mux := http.NewServeMux()
|
||||
mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
|
||||
if r.Method == "HEAD" {
|
||||
w.WriteHeader(200)
|
||||
return
|
||||
}
|
||||
if r.Method != "POST" || !strings.Contains(r.URL.Path, "/v1/messages") {
|
||||
w.Header().Set("Content-Type", "application/json")
|
||||
w.WriteHeader(200)
|
||||
fmt.Fprint(w, `{"id":"msg_fake","type":"message","role":"assistant","content":[{"type":"text","text":"ok"}],"model":"claude-sonnet-4-6","stop_reason":"end_turn","usage":{"input_tokens":1,"output_tokens":1}}`)
|
||||
return
|
||||
}
|
||||
|
||||
body, _ := io.ReadAll(r.Body)
|
||||
|
||||
mu.Lock()
|
||||
if profile == nil {
|
||||
profile = extractProfile(r, body)
|
||||
select {
|
||||
case captured <- struct{}{}:
|
||||
default:
|
||||
}
|
||||
}
|
||||
mu.Unlock()
|
||||
|
||||
if strings.Contains(string(body), `"stream":true`) {
|
||||
w.Header().Set("Content-Type", "text/event-stream")
|
||||
w.WriteHeader(200)
|
||||
fmt.Fprint(w, "event: message_start\ndata: {\"type\":\"message_start\",\"message\":{\"id\":\"msg_fake\",\"type\":\"message\",\"role\":\"assistant\",\"content\":[],\"model\":\"claude-sonnet-4-6\",\"stop_reason\":null,\"usage\":{\"input_tokens\":1,\"output_tokens\":1}}}\n\n")
|
||||
fmt.Fprint(w, "event: content_block_start\ndata: {\"type\":\"content_block_start\",\"index\":0,\"content_block\":{\"type\":\"text\",\"text\":\"\"}}\n\n")
|
||||
fmt.Fprint(w, "event: content_block_delta\ndata: {\"type\":\"content_block_delta\",\"index\":0,\"delta\":{\"type\":\"text_delta\",\"text\":\"ok\"}}\n\n")
|
||||
fmt.Fprint(w, "event: content_block_stop\ndata: {\"type\":\"content_block_stop\",\"index\":0}\n\n")
|
||||
fmt.Fprint(w, "event: message_delta\ndata: {\"type\":\"message_delta\",\"delta\":{\"stop_reason\":\"end_turn\"},\"usage\":{\"output_tokens\":1}}\n\n")
|
||||
fmt.Fprint(w, "event: message_stop\ndata: {\"type\":\"message_stop\"}\n\n")
|
||||
} else {
|
||||
w.Header().Set("Content-Type", "application/json")
|
||||
w.WriteHeader(200)
|
||||
fmt.Fprint(w, `{"id":"msg_fake","type":"message","role":"assistant","content":[{"type":"text","text":"ok"}],"model":"claude-sonnet-4-6","stop_reason":"end_turn","usage":{"input_tokens":1,"output_tokens":1}}`)
|
||||
}
|
||||
})
|
||||
|
||||
srv := &http.Server{Handler: mux}
|
||||
go srv.Serve(listener)
|
||||
defer srv.Close()
|
||||
|
||||
cmd := exec.Command(claudeBinary, "--print", "say hi")
|
||||
cmd.Env = append(cmd.Environ(), fmt.Sprintf("ANTHROPIC_BASE_URL=http://127.0.0.1:%d", port))
|
||||
if err := cmd.Start(); err != nil {
|
||||
return nil, fmt.Errorf("start claude: %w", err)
|
||||
}
|
||||
|
||||
done := make(chan error, 1)
|
||||
go func() { done <- cmd.Wait() }()
|
||||
|
||||
select {
|
||||
case <-captured:
|
||||
cmd.Process.Kill()
|
||||
case err := <-done:
|
||||
if err != nil && profile == nil {
|
||||
return nil, fmt.Errorf("claude exited: %w", err)
|
||||
}
|
||||
case <-time.After(30 * time.Second):
|
||||
cmd.Process.Kill()
|
||||
return nil, fmt.Errorf("sniff timed out after 30s")
|
||||
}
|
||||
|
||||
if profile == nil {
|
||||
return nil, fmt.Errorf("no API request captured")
|
||||
}
|
||||
|
||||
log.Printf("sniffed claude-code: version=%s headers=%d body=%d bytes",
|
||||
profile.Version, len(profile.Headers), len(profile.Body))
|
||||
return profile, nil
|
||||
}
|
||||
|
||||
func extractProfile(r *http.Request, body []byte) *SniffedProfile {
|
||||
// Capture raw headers preserving original casing and order.
|
||||
var headers [][2]string
|
||||
for i := 0; i < len(r.Header); i++ {
|
||||
for name, vals := range r.Header {
|
||||
if skipHeaders[strings.ToLower(name)] {
|
||||
continue
|
||||
}
|
||||
for _, v := range vals {
|
||||
headers = append(headers, [2]string{name, v})
|
||||
}
|
||||
}
|
||||
break
|
||||
}
|
||||
|
||||
// Deduplicate and strip subscription-specific betas.
|
||||
seen := map[string]bool{}
|
||||
var deduped [][2]string
|
||||
for _, h := range headers {
|
||||
key := strings.ToLower(h[0])
|
||||
if seen[key] {
|
||||
continue
|
||||
}
|
||||
seen[key] = true
|
||||
if key == "anthropic-beta" {
|
||||
var filtered []string
|
||||
for _, b := range strings.Split(h[1], ",") {
|
||||
if !strings.Contains(b, "context-1m") {
|
||||
filtered = append(filtered, b)
|
||||
}
|
||||
}
|
||||
h[1] = strings.Join(filtered, ",")
|
||||
}
|
||||
deduped = append(deduped, h)
|
||||
}
|
||||
|
||||
ua := r.Header.Get("User-Agent")
|
||||
version := ""
|
||||
if i := strings.Index(ua, "/"); i > 0 {
|
||||
rest := ua[i+1:]
|
||||
if j := strings.IndexByte(rest, ' '); j > 0 {
|
||||
version = rest[:j]
|
||||
} else {
|
||||
version = rest
|
||||
}
|
||||
}
|
||||
|
||||
// Extract the system prompt template from the body (everything except the billing header block).
|
||||
// The billing header is the first system block starting with "x-anthropic-billing-header:".
|
||||
systemBlocks := gjson.GetBytes(body, "system")
|
||||
var templateSystem []string
|
||||
if systemBlocks.IsArray() {
|
||||
for _, block := range systemBlocks.Array() {
|
||||
text := block.Get("text").String()
|
||||
if strings.HasPrefix(text, "x-anthropic-billing-header:") {
|
||||
continue
|
||||
}
|
||||
templateSystem = append(templateSystem, block.Raw)
|
||||
}
|
||||
}
|
||||
_ = templateSystem // stored in body for now
|
||||
|
||||
return &SniffedProfile{
|
||||
Headers: deduped,
|
||||
Body: body,
|
||||
Version: version,
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,111 @@
|
||||
package proxy
|
||||
|
||||
import (
|
||||
"log"
|
||||
"net"
|
||||
"net/http"
|
||||
"sync"
|
||||
|
||||
tls "github.com/refraction-networking/utls"
|
||||
"golang.org/x/net/http2"
|
||||
)
|
||||
|
||||
type utlsRoundTripper struct {
|
||||
mu sync.Mutex
|
||||
connections map[string]*http2.ClientConn
|
||||
pending map[string]*sync.Cond
|
||||
}
|
||||
|
||||
func newUtlsRoundTripper() *utlsRoundTripper {
|
||||
return &utlsRoundTripper{
|
||||
connections: make(map[string]*http2.ClientConn),
|
||||
pending: make(map[string]*sync.Cond),
|
||||
}
|
||||
}
|
||||
|
||||
func (t *utlsRoundTripper) getOrCreateConnection(host, addr string) (*http2.ClientConn, error) {
|
||||
t.mu.Lock()
|
||||
|
||||
if h2Conn, ok := t.connections[host]; ok && h2Conn.CanTakeNewRequest() {
|
||||
t.mu.Unlock()
|
||||
return h2Conn, nil
|
||||
}
|
||||
|
||||
if cond, ok := t.pending[host]; ok {
|
||||
cond.Wait()
|
||||
if h2Conn, ok := t.connections[host]; ok && h2Conn.CanTakeNewRequest() {
|
||||
t.mu.Unlock()
|
||||
return h2Conn, nil
|
||||
}
|
||||
}
|
||||
|
||||
cond := sync.NewCond(&t.mu)
|
||||
t.pending[host] = cond
|
||||
t.mu.Unlock()
|
||||
|
||||
h2Conn, err := t.createConnection(host, addr)
|
||||
|
||||
t.mu.Lock()
|
||||
defer t.mu.Unlock()
|
||||
|
||||
delete(t.pending, host)
|
||||
cond.Broadcast()
|
||||
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
t.connections[host] = h2Conn
|
||||
return h2Conn, nil
|
||||
}
|
||||
|
||||
func (t *utlsRoundTripper) createConnection(host, addr string) (*http2.ClientConn, error) {
|
||||
conn, err := net.Dial("tcp", addr)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
tlsConfig := &tls.Config{ServerName: host}
|
||||
tlsConn := tls.UClient(conn, tlsConfig, tls.HelloChrome_Auto)
|
||||
|
||||
if err := tlsConn.Handshake(); err != nil {
|
||||
conn.Close()
|
||||
return nil, err
|
||||
}
|
||||
|
||||
tr := &http2.Transport{}
|
||||
h2Conn, err := tr.NewClientConn(tlsConn)
|
||||
if err != nil {
|
||||
tlsConn.Close()
|
||||
return nil, err
|
||||
}
|
||||
|
||||
return h2Conn, nil
|
||||
}
|
||||
|
||||
func (t *utlsRoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
|
||||
hostname := req.URL.Hostname()
|
||||
port := req.URL.Port()
|
||||
if port == "" {
|
||||
port = "443"
|
||||
}
|
||||
addr := net.JoinHostPort(hostname, port)
|
||||
log.Printf("utls: RoundTrip to %s (Chrome TLS fingerprint, HTTP/2)", addr)
|
||||
|
||||
h2Conn, err := t.getOrCreateConnection(hostname, addr)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
resp, err := h2Conn.RoundTrip(req)
|
||||
if err != nil {
|
||||
t.mu.Lock()
|
||||
if cached, ok := t.connections[hostname]; ok && cached == h2Conn {
|
||||
delete(t.connections, hostname)
|
||||
}
|
||||
t.mu.Unlock()
|
||||
return nil, err
|
||||
}
|
||||
|
||||
return resp, nil
|
||||
}
|
||||
@@ -0,0 +1,105 @@
|
||||
package proxy
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"context"
|
||||
"fmt"
|
||||
"io"
|
||||
"net/http"
|
||||
"strings"
|
||||
|
||||
"github.com/google/uuid"
|
||||
|
||||
"github.com/fujin/anthropic-proxy/internal/auth"
|
||||
)
|
||||
|
||||
const messagesURL = "https://api.anthropic.com/v1/messages?beta=true"
|
||||
|
||||
type UpstreamClient struct {
|
||||
client http.Client
|
||||
sessionID string
|
||||
profile *SniffedProfile
|
||||
}
|
||||
|
||||
func NewUpstreamClient(profile *SniffedProfile) *UpstreamClient {
|
||||
return &UpstreamClient{
|
||||
client: http.Client{
|
||||
Timeout: 0,
|
||||
Transport: newUtlsRoundTripper(),
|
||||
},
|
||||
sessionID: uuid.New().String(),
|
||||
profile: profile,
|
||||
}
|
||||
}
|
||||
|
||||
func (u *UpstreamClient) version() string {
|
||||
if u.profile != nil && u.profile.Version != "" {
|
||||
return u.profile.Version
|
||||
}
|
||||
return "2.1.92"
|
||||
}
|
||||
|
||||
// applyHeaders replays sniffed headers, substituting auth + per-request IDs + accept.
|
||||
func (u *UpstreamClient) applyHeaders(req *http.Request, token string, streaming bool) {
|
||||
if u.profile != nil {
|
||||
for _, h := range u.profile.Headers {
|
||||
req.Header.Set(h[0], h[1])
|
||||
}
|
||||
}
|
||||
|
||||
req.Header.Del("Authorization")
|
||||
req.Header.Del("x-api-key")
|
||||
if strings.HasPrefix(token, "sk-ant-oat") {
|
||||
req.Header.Set("Authorization", "Bearer "+token)
|
||||
} else {
|
||||
req.Header.Set("x-api-key", token)
|
||||
}
|
||||
|
||||
req.Header.Set("X-Claude-Code-Session-Id", u.sessionID)
|
||||
req.Header.Set("x-client-request-id", uuid.New().String())
|
||||
|
||||
if streaming {
|
||||
req.Header.Set("Accept", "text/event-stream")
|
||||
} else {
|
||||
req.Header.Set("Accept", "application/json")
|
||||
}
|
||||
req.Header.Set("Accept-Encoding", "identity")
|
||||
}
|
||||
|
||||
func (u *UpstreamClient) Execute(ctx context.Context, cred *auth.Credential, body []byte) ([]byte, http.Header, int, error) {
|
||||
body = injectBillingHeader(body, u.version())
|
||||
|
||||
req, err := http.NewRequestWithContext(ctx, http.MethodPost, messagesURL, bytes.NewReader(body))
|
||||
if err != nil {
|
||||
return nil, nil, 0, fmt.Errorf("build upstream request: %w", err)
|
||||
}
|
||||
u.applyHeaders(req, cred.Token(), false)
|
||||
|
||||
resp, err := u.client.Do(req)
|
||||
if err != nil {
|
||||
return nil, nil, 0, fmt.Errorf("upstream request: %w", err)
|
||||
}
|
||||
defer resp.Body.Close()
|
||||
|
||||
respBody, err := io.ReadAll(resp.Body)
|
||||
if err != nil {
|
||||
return nil, nil, resp.StatusCode, fmt.Errorf("read upstream response: %w", err)
|
||||
}
|
||||
return respBody, resp.Header, resp.StatusCode, nil
|
||||
}
|
||||
|
||||
func (u *UpstreamClient) ExecuteStream(ctx context.Context, cred *auth.Credential, body []byte) (*http.Response, error) {
|
||||
body = injectBillingHeader(body, u.version())
|
||||
|
||||
req, err := http.NewRequestWithContext(ctx, http.MethodPost, messagesURL, bytes.NewReader(body))
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("build upstream stream request: %w", err)
|
||||
}
|
||||
u.applyHeaders(req, cred.Token(), true)
|
||||
|
||||
resp, err := u.client.Do(req)
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("upstream stream request: %w", err)
|
||||
}
|
||||
return resp, nil
|
||||
}
|
||||
@@ -0,0 +1,87 @@
|
||||
package server
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
"net/http"
|
||||
"strings"
|
||||
|
||||
"github.com/gin-gonic/gin"
|
||||
|
||||
"github.com/fujin/anthropic-proxy/internal/auth"
|
||||
"github.com/fujin/anthropic-proxy/internal/config"
|
||||
"github.com/fujin/anthropic-proxy/internal/proxy"
|
||||
)
|
||||
|
||||
type Server struct {
|
||||
engine *gin.Engine
|
||||
port int
|
||||
}
|
||||
|
||||
func New(cfg *config.Config, pool *auth.Pool, profile *proxy.SniffedProfile) *Server {
|
||||
gin.SetMode(gin.ReleaseMode)
|
||||
engine := gin.New()
|
||||
engine.Use(gin.Recovery())
|
||||
engine.Use(corsMiddleware())
|
||||
engine.Use(authMiddleware(cfg.APIKeys))
|
||||
|
||||
engine.POST("/v1/messages", proxy.HandleMessages(pool, profile))
|
||||
engine.GET("/healthz", func(c *gin.Context) {
|
||||
c.JSON(http.StatusOK, gin.H{"status": "ok"})
|
||||
})
|
||||
|
||||
return &Server{engine: engine, port: cfg.Port}
|
||||
}
|
||||
|
||||
func (s *Server) Start() error {
|
||||
addr := fmt.Sprintf(":%d", s.port)
|
||||
return s.engine.Run(addr)
|
||||
}
|
||||
|
||||
func corsMiddleware() gin.HandlerFunc {
|
||||
return func(c *gin.Context) {
|
||||
c.Header("Access-Control-Allow-Origin", "*")
|
||||
c.Header("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, OPTIONS")
|
||||
c.Header("Access-Control-Allow-Headers", "Origin, Content-Type, Authorization, x-api-key")
|
||||
|
||||
if c.Request.Method == http.MethodOptions {
|
||||
c.AbortWithStatus(http.StatusNoContent)
|
||||
return
|
||||
}
|
||||
|
||||
c.Next()
|
||||
}
|
||||
}
|
||||
|
||||
func authMiddleware(apiKeys []string) gin.HandlerFunc {
|
||||
keySet := make(map[string]struct{}, len(apiKeys))
|
||||
for _, k := range apiKeys {
|
||||
keySet[k] = struct{}{}
|
||||
}
|
||||
|
||||
return func(c *gin.Context) {
|
||||
if c.Request.URL.Path == "/healthz" {
|
||||
c.Next()
|
||||
return
|
||||
}
|
||||
|
||||
token := ""
|
||||
if authHeader := c.GetHeader("Authorization"); authHeader != "" {
|
||||
token = strings.TrimPrefix(authHeader, "Bearer ")
|
||||
}
|
||||
if token == "" {
|
||||
token = c.GetHeader("x-api-key")
|
||||
}
|
||||
|
||||
if token == "" {
|
||||
c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "missing authentication"})
|
||||
return
|
||||
}
|
||||
|
||||
if _, ok := keySet[token]; !ok {
|
||||
c.AbortWithStatusJSON(http.StatusForbidden, gin.H{"error": "invalid api key"})
|
||||
return
|
||||
}
|
||||
|
||||
c.Next()
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,60 @@
|
||||
package main
|
||||
|
||||
import (
|
||||
"context"
|
||||
"fmt"
|
||||
"log"
|
||||
"os"
|
||||
"time"
|
||||
|
||||
"github.com/fujin/anthropic-proxy/internal/auth"
|
||||
"github.com/fujin/anthropic-proxy/internal/config"
|
||||
"github.com/fujin/anthropic-proxy/internal/proxy"
|
||||
"github.com/fujin/anthropic-proxy/internal/server"
|
||||
)
|
||||
|
||||
func run() error {
|
||||
log.SetFlags(log.LstdFlags)
|
||||
|
||||
cfg, err := config.Load("config.yaml")
|
||||
if err != nil {
|
||||
return fmt.Errorf("load config: %w", err)
|
||||
}
|
||||
|
||||
creds, err := config.LoadCredentials(cfg)
|
||||
if err != nil {
|
||||
return fmt.Errorf("load credentials: %w", err)
|
||||
}
|
||||
|
||||
if len(creds) == 0 {
|
||||
return fmt.Errorf("no credentials found")
|
||||
}
|
||||
|
||||
log.Printf("loaded %d credentials", len(creds))
|
||||
|
||||
pool := auth.NewPool(creds)
|
||||
|
||||
ctx, cancel := context.WithTimeout(context.Background(), 60*time.Second)
|
||||
defer cancel()
|
||||
pool.RefreshExpiring(ctx)
|
||||
|
||||
var profile *proxy.SniffedProfile
|
||||
if cfg.ClaudeBinary != "" {
|
||||
log.Printf("sniffing claude-code at %s...", cfg.ClaudeBinary)
|
||||
profile, err = proxy.SniffClaudeCode(cfg.ClaudeBinary)
|
||||
if err != nil {
|
||||
log.Printf("warning: sniff failed, using defaults: %v", err)
|
||||
}
|
||||
}
|
||||
|
||||
log.Printf("starting server on port %d", cfg.Port)
|
||||
srv := server.New(cfg, pool, profile)
|
||||
return srv.Start()
|
||||
}
|
||||
|
||||
func main() {
|
||||
if err := run(); err != nil {
|
||||
log.Printf("error: %v", err)
|
||||
os.Exit(1)
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user