Alexander
64 lines
1.8 KiB
Markdown
64 lines
1.8 KiB
Markdown
# anthropic-proxy
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Reverse proxy that lets OpenCode (and similar tools) use a Claude subscription instead of an API key.
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## Prerequisites
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- Go 1.26+
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Optional: [Nix](https://nixos.org/) flake for dev shell (`nix develop`).
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## Setup
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```
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cp config.example.yaml config.yaml
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```
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Edit `config.yaml`:
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- `api_keys` — key(s) your clients use to authenticate with the proxy
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- `claude_binary` — optional path to `claude` binary (used for request fingerprinting via sniff only)
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## Authentication
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On first run, if no credentials are found at `~/.claude/.credentials.json`, the proxy starts an OAuth login flow in your browser. Credentials are stored at `~/.claude/.credentials.json` (the same file Claude Code CLI uses). On subsequent runs, existing credentials are reused and refreshed automatically.
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If running headlessly (SSH/server), the authorization URL is printed to stdout and you can paste the authorization code manually.
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If you've already logged in with Claude Code CLI, the proxy will use the same credentials.
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## Build and run
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```
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go build -o anthropic-proxy .
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./anthropic-proxy
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```
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## Usage with OpenCode
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```
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export ANTHROPIC_API_KEY=your-proxy-api-key
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export ANTHROPIC_BASE_URL=http://localhost:8082
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opencode
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```
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## Endpoints
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| Method | Path | Description |
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|--------|------|-------------|
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| POST | `/v1/messages` | Anthropic messages API (proxied) |
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| POST | `/messages` | Same, without `/v1` prefix |
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| GET | `/healthz` | Health check |
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| POST | `/reload` | Hot-reload `config.yaml` |
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## Request sanitization
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The `sanitize` section in config renames tool names and replaces strings in system prompts before forwarding to Anthropic. Responses are de-sanitized before returning to the client.
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See `config.example.yaml` for the default rules.
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Reload after editing config:
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```
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curl -X POST localhost:8082/reload
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```
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