ce104bed45
- add scope-aware proxy schema and runtime wiring for providers/channels/tools - add agent callable proxy_config tool for fast proxy setup - standardize docs system with index, template, and playbooks
703 lines
23 KiB
Rust
703 lines
23 KiB
Rust
//! GitHub Copilot provider with OAuth device-flow authentication.
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//!
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//! Authenticates via GitHub's device code flow (same as VS Code Copilot),
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//! then exchanges the OAuth token for short-lived Copilot API keys.
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//! Tokens are cached to disk and auto-refreshed.
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//!
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//! **Note:** This uses VS Code's OAuth client ID (`Iv1.b507a08c87ecfe98`) and
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//! editor headers. This is the same approach used by LiteLLM, Codex CLI,
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//! and other third-party Copilot integrations. The Copilot token endpoint is
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//! private; there is no public OAuth scope or app registration for it.
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//! GitHub could change or revoke this at any time, which would break all
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//! third-party integrations simultaneously.
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use crate::providers::traits::{
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ChatMessage, ChatRequest as ProviderChatRequest, ChatResponse as ProviderChatResponse,
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Provider, ToolCall as ProviderToolCall,
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};
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use crate::tools::ToolSpec;
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use async_trait::async_trait;
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use reqwest::Client;
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use serde::{Deserialize, Serialize};
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use std::path::{Path, PathBuf};
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use std::sync::Arc;
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use std::time::Duration;
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use tokio::sync::Mutex;
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use tracing::warn;
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/// GitHub OAuth client ID for Copilot (VS Code extension).
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const GITHUB_CLIENT_ID: &str = "Iv1.b507a08c87ecfe98";
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const GITHUB_DEVICE_CODE_URL: &str = "https://github.com/login/device/code";
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const GITHUB_ACCESS_TOKEN_URL: &str = "https://github.com/login/oauth/access_token";
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const GITHUB_API_KEY_URL: &str = "https://api.github.com/copilot_internal/v2/token";
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const DEFAULT_API: &str = "https://api.githubcopilot.com";
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// ── Token types ──────────────────────────────────────────────────
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#[derive(Debug, Deserialize)]
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struct DeviceCodeResponse {
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device_code: String,
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user_code: String,
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verification_uri: String,
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#[serde(default = "default_interval")]
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interval: u64,
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#[serde(default = "default_expires_in")]
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expires_in: u64,
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}
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fn default_interval() -> u64 {
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5
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}
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fn default_expires_in() -> u64 {
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900
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}
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#[derive(Debug, Deserialize)]
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struct AccessTokenResponse {
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access_token: Option<String>,
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error: Option<String>,
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}
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#[derive(Debug, Serialize, Deserialize)]
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struct ApiKeyInfo {
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token: String,
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expires_at: i64,
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#[serde(default)]
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endpoints: Option<ApiEndpoints>,
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}
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#[derive(Debug, Serialize, Deserialize)]
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struct ApiEndpoints {
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api: Option<String>,
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}
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struct CachedApiKey {
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token: String,
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api_endpoint: String,
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expires_at: i64,
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}
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// ── Chat completions types ───────────────────────────────────────
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#[derive(Debug, Serialize)]
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struct ApiChatRequest {
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model: String,
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messages: Vec<ApiMessage>,
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temperature: f64,
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#[serde(skip_serializing_if = "Option::is_none")]
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tools: Option<Vec<NativeToolSpec>>,
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#[serde(skip_serializing_if = "Option::is_none")]
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tool_choice: Option<String>,
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}
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#[derive(Debug, Serialize)]
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struct ApiMessage {
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role: String,
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#[serde(skip_serializing_if = "Option::is_none")]
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content: Option<String>,
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#[serde(skip_serializing_if = "Option::is_none")]
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tool_call_id: Option<String>,
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#[serde(skip_serializing_if = "Option::is_none")]
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tool_calls: Option<Vec<NativeToolCall>>,
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}
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#[derive(Debug, Serialize)]
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struct NativeToolSpec {
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#[serde(rename = "type")]
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kind: String,
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function: NativeToolFunctionSpec,
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}
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#[derive(Debug, Serialize)]
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struct NativeToolFunctionSpec {
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name: String,
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description: String,
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parameters: serde_json::Value,
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}
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#[derive(Debug, Serialize, Deserialize)]
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struct NativeToolCall {
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#[serde(skip_serializing_if = "Option::is_none")]
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id: Option<String>,
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#[serde(rename = "type", skip_serializing_if = "Option::is_none")]
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kind: Option<String>,
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function: NativeFunctionCall,
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}
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#[derive(Debug, Serialize, Deserialize)]
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struct NativeFunctionCall {
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name: String,
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arguments: String,
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}
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#[derive(Debug, Deserialize)]
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struct ApiChatResponse {
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choices: Vec<Choice>,
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}
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#[derive(Debug, Deserialize)]
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struct Choice {
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message: ResponseMessage,
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}
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#[derive(Debug, Deserialize)]
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struct ResponseMessage {
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#[serde(default)]
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content: Option<String>,
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#[serde(default)]
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tool_calls: Option<Vec<NativeToolCall>>,
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}
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// ── Provider ─────────────────────────────────────────────────────
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/// GitHub Copilot provider with automatic OAuth and token refresh.
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///
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/// On first use, prompts the user to visit github.com/login/device.
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/// Tokens are cached to `~/.config/zeroclaw/copilot/` and refreshed
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/// automatically.
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pub struct CopilotProvider {
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github_token: Option<String>,
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/// Mutex ensures only one caller refreshes tokens at a time,
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/// preventing duplicate device flow prompts or redundant API calls.
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refresh_lock: Arc<Mutex<Option<CachedApiKey>>>,
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token_dir: PathBuf,
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}
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impl CopilotProvider {
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pub fn new(github_token: Option<&str>) -> Self {
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let token_dir = directories::ProjectDirs::from("", "", "zeroclaw")
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.map(|dir| dir.config_dir().join("copilot"))
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.unwrap_or_else(|| {
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// Fall back to a user-specific temp directory to avoid
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// shared-directory symlink attacks.
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let user = std::env::var("USER")
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.or_else(|_| std::env::var("USERNAME"))
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.unwrap_or_else(|_| "unknown".to_string());
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std::env::temp_dir().join(format!("zeroclaw-copilot-{user}"))
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});
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if let Err(err) = std::fs::create_dir_all(&token_dir) {
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warn!(
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"Failed to create Copilot token directory {:?}: {err}. Token caching is disabled.",
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token_dir
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);
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} else {
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#[cfg(unix)]
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{
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use std::os::unix::fs::PermissionsExt;
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if let Err(err) =
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std::fs::set_permissions(&token_dir, std::fs::Permissions::from_mode(0o700))
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{
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warn!(
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"Failed to set Copilot token directory permissions on {:?}: {err}",
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token_dir
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);
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}
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}
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}
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Self {
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github_token: github_token
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.filter(|token| !token.is_empty())
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.map(String::from),
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refresh_lock: Arc::new(Mutex::new(None)),
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token_dir,
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}
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}
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fn http_client(&self) -> Client {
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crate::config::build_runtime_proxy_client_with_timeouts("provider.copilot", 120, 10)
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}
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/// Required headers for Copilot API requests (editor identification).
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const COPILOT_HEADERS: [(&str, &str); 4] = [
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("Editor-Version", "vscode/1.85.1"),
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("Editor-Plugin-Version", "copilot/1.155.0"),
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("User-Agent", "GithubCopilot/1.155.0"),
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("Accept", "application/json"),
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];
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fn convert_tools(tools: Option<&[ToolSpec]>) -> Option<Vec<NativeToolSpec>> {
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tools.map(|items| {
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items
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.iter()
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.map(|tool| NativeToolSpec {
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kind: "function".to_string(),
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function: NativeToolFunctionSpec {
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name: tool.name.clone(),
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description: tool.description.clone(),
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parameters: tool.parameters.clone(),
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},
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})
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.collect()
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})
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}
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fn convert_messages(messages: &[ChatMessage]) -> Vec<ApiMessage> {
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messages
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.iter()
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.map(|message| {
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if message.role == "assistant" {
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if let Ok(value) = serde_json::from_str::<serde_json::Value>(&message.content) {
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if let Some(tool_calls_value) = value.get("tool_calls") {
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if let Ok(parsed_calls) =
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serde_json::from_value::<Vec<ProviderToolCall>>(tool_calls_value.clone())
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{
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let tool_calls = parsed_calls
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.into_iter()
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.map(|tool_call| NativeToolCall {
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id: Some(tool_call.id),
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kind: Some("function".to_string()),
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function: NativeFunctionCall {
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name: tool_call.name,
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arguments: tool_call.arguments,
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},
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})
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.collect::<Vec<_>>();
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let content = value
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.get("content")
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.and_then(serde_json::Value::as_str)
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.map(ToString::to_string);
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return ApiMessage {
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role: "assistant".to_string(),
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content,
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tool_call_id: None,
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tool_calls: Some(tool_calls),
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};
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}
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}
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}
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}
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if message.role == "tool" {
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if let Ok(value) = serde_json::from_str::<serde_json::Value>(&message.content) {
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let tool_call_id = value
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.get("tool_call_id")
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.and_then(serde_json::Value::as_str)
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.map(ToString::to_string);
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let content = value
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.get("content")
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.and_then(serde_json::Value::as_str)
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.map(ToString::to_string);
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return ApiMessage {
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role: "tool".to_string(),
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content,
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tool_call_id,
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tool_calls: None,
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};
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}
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}
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ApiMessage {
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role: message.role.clone(),
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content: Some(message.content.clone()),
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tool_call_id: None,
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tool_calls: None,
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}
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})
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.collect()
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}
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/// Send a chat completions request with required Copilot headers.
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async fn send_chat_request(
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&self,
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messages: Vec<ApiMessage>,
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tools: Option<&[ToolSpec]>,
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model: &str,
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temperature: f64,
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) -> anyhow::Result<ProviderChatResponse> {
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let (token, endpoint) = self.get_api_key().await?;
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let url = format!("{}/chat/completions", endpoint.trim_end_matches('/'));
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let native_tools = Self::convert_tools(tools);
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let request = ApiChatRequest {
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model: model.to_string(),
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messages,
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temperature,
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tool_choice: native_tools.as_ref().map(|_| "auto".to_string()),
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tools: native_tools,
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};
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let mut req = self
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.http_client()
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.post(&url)
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.header("Authorization", format!("Bearer {token}"))
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.json(&request);
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for (header, value) in &Self::COPILOT_HEADERS {
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req = req.header(*header, *value);
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}
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let response = req.send().await?;
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if !response.status().is_success() {
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return Err(super::api_error("GitHub Copilot", response).await);
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}
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let api_response: ApiChatResponse = response.json().await?;
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let choice = api_response
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.choices
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.into_iter()
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.next()
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.ok_or_else(|| anyhow::anyhow!("No response from GitHub Copilot"))?;
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let tool_calls = choice
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.message
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.tool_calls
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.unwrap_or_default()
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.into_iter()
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.map(|tool_call| ProviderToolCall {
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id: tool_call
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.id
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.unwrap_or_else(|| uuid::Uuid::new_v4().to_string()),
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name: tool_call.function.name,
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arguments: tool_call.function.arguments,
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})
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.collect();
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Ok(ProviderChatResponse {
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text: choice.message.content,
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tool_calls,
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})
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}
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/// Get a valid Copilot API key, refreshing or re-authenticating as needed.
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/// Uses a Mutex to ensure only one caller refreshes at a time.
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async fn get_api_key(&self) -> anyhow::Result<(String, String)> {
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let mut cached = self.refresh_lock.lock().await;
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if let Some(cached_key) = cached.as_ref() {
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if chrono::Utc::now().timestamp() + 120 < cached_key.expires_at {
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return Ok((cached_key.token.clone(), cached_key.api_endpoint.clone()));
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}
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}
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if let Some(info) = self.load_api_key_from_disk().await {
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if chrono::Utc::now().timestamp() + 120 < info.expires_at {
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let endpoint = info
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.endpoints
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.as_ref()
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.and_then(|e| e.api.clone())
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.unwrap_or_else(|| DEFAULT_API.to_string());
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let token = info.token;
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*cached = Some(CachedApiKey {
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token: token.clone(),
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api_endpoint: endpoint.clone(),
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expires_at: info.expires_at,
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});
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return Ok((token, endpoint));
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}
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}
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let access_token = self.get_github_access_token().await?;
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let api_key_info = self.exchange_for_api_key(&access_token).await?;
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self.save_api_key_to_disk(&api_key_info).await;
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let endpoint = api_key_info
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.endpoints
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.as_ref()
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.and_then(|e| e.api.clone())
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.unwrap_or_else(|| DEFAULT_API.to_string());
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*cached = Some(CachedApiKey {
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token: api_key_info.token.clone(),
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api_endpoint: endpoint.clone(),
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expires_at: api_key_info.expires_at,
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});
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Ok((api_key_info.token, endpoint))
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}
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/// Get a GitHub access token from config, cache, or device flow.
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async fn get_github_access_token(&self) -> anyhow::Result<String> {
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if let Some(token) = &self.github_token {
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return Ok(token.clone());
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}
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let access_token_path = self.token_dir.join("access-token");
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if let Ok(cached) = tokio::fs::read_to_string(&access_token_path).await {
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let token = cached.trim();
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if !token.is_empty() {
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return Ok(token.to_string());
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}
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}
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let token = self.device_code_login().await?;
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write_file_secure(&access_token_path, &token).await;
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Ok(token)
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}
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/// Run GitHub OAuth device code flow.
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async fn device_code_login(&self) -> anyhow::Result<String> {
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let response: DeviceCodeResponse = self
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.http_client()
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.post(GITHUB_DEVICE_CODE_URL)
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.header("Accept", "application/json")
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.json(&serde_json::json!({
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"client_id": GITHUB_CLIENT_ID,
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"scope": "read:user"
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}))
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.send()
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.await?
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.error_for_status()?
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.json()
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.await?;
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let mut poll_interval = Duration::from_secs(response.interval.max(5));
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let expires_in = response.expires_in.max(1);
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let expires_at = tokio::time::Instant::now() + Duration::from_secs(expires_in);
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eprintln!(
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"\nGitHub Copilot authentication is required.\n\
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Visit: {}\n\
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Code: {}\n\
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Waiting for authorization...\n",
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response.verification_uri, response.user_code
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);
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while tokio::time::Instant::now() < expires_at {
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tokio::time::sleep(poll_interval).await;
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let token_response: AccessTokenResponse = self
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.http_client()
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.post(GITHUB_ACCESS_TOKEN_URL)
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.header("Accept", "application/json")
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.json(&serde_json::json!({
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"client_id": GITHUB_CLIENT_ID,
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"device_code": response.device_code,
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"grant_type": "urn:ietf:params:oauth:grant-type:device_code"
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}))
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.send()
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.await?
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.json()
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.await?;
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if let Some(token) = token_response.access_token {
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eprintln!("Authentication succeeded.\n");
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return Ok(token);
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}
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match token_response.error.as_deref() {
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Some("slow_down") => {
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poll_interval += Duration::from_secs(5);
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}
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Some("authorization_pending") | None => {}
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Some("expired_token") => {
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anyhow::bail!("GitHub device authorization expired")
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}
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Some(error) => anyhow::bail!("GitHub auth failed: {error}"),
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}
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}
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anyhow::bail!("Timed out waiting for GitHub authorization")
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}
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|
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/// Exchange a GitHub access token for a Copilot API key.
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async fn exchange_for_api_key(&self, access_token: &str) -> anyhow::Result<ApiKeyInfo> {
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let mut request = self.http_client().get(GITHUB_API_KEY_URL);
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for (header, value) in &Self::COPILOT_HEADERS {
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request = request.header(*header, *value);
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}
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request = request.header("Authorization", format!("token {access_token}"));
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let response = request.send().await?;
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if !response.status().is_success() {
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let status = response.status();
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let body = response.text().await.unwrap_or_default();
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let sanitized = super::sanitize_api_error(&body);
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if status.as_u16() == 401 || status.as_u16() == 403 {
|
|
let access_token_path = self.token_dir.join("access-token");
|
|
tokio::fs::remove_file(&access_token_path).await.ok();
|
|
}
|
|
|
|
anyhow::bail!(
|
|
"Failed to get Copilot API key ({status}): {sanitized}. \
|
|
Ensure your GitHub account has an active Copilot subscription."
|
|
);
|
|
}
|
|
|
|
let info: ApiKeyInfo = response.json().await?;
|
|
Ok(info)
|
|
}
|
|
|
|
async fn load_api_key_from_disk(&self) -> Option<ApiKeyInfo> {
|
|
let path = self.token_dir.join("api-key.json");
|
|
let data = tokio::fs::read_to_string(&path).await.ok()?;
|
|
serde_json::from_str(&data).ok()
|
|
}
|
|
|
|
async fn save_api_key_to_disk(&self, info: &ApiKeyInfo) {
|
|
let path = self.token_dir.join("api-key.json");
|
|
if let Ok(json) = serde_json::to_string_pretty(info) {
|
|
write_file_secure(&path, &json).await;
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Write a file with 0600 permissions (owner read/write only).
|
|
/// Uses `spawn_blocking` to avoid blocking the async runtime.
|
|
async fn write_file_secure(path: &Path, content: &str) {
|
|
let path = path.to_path_buf();
|
|
let content = content.to_string();
|
|
|
|
let result = tokio::task::spawn_blocking(move || {
|
|
#[cfg(unix)]
|
|
{
|
|
use std::io::Write;
|
|
use std::os::unix::fs::{OpenOptionsExt, PermissionsExt};
|
|
|
|
let mut file = std::fs::OpenOptions::new()
|
|
.write(true)
|
|
.create(true)
|
|
.truncate(true)
|
|
.mode(0o600)
|
|
.open(&path)?;
|
|
file.write_all(content.as_bytes())?;
|
|
|
|
std::fs::set_permissions(&path, std::fs::Permissions::from_mode(0o600))?;
|
|
Ok::<(), std::io::Error>(())
|
|
}
|
|
#[cfg(not(unix))]
|
|
{
|
|
std::fs::write(&path, &content)?;
|
|
Ok::<(), std::io::Error>(())
|
|
}
|
|
})
|
|
.await;
|
|
|
|
match result {
|
|
Ok(Ok(())) => {}
|
|
Ok(Err(err)) => warn!("Failed to write secure file: {err}"),
|
|
Err(err) => warn!("Failed to spawn blocking write: {err}"),
|
|
}
|
|
}
|
|
|
|
#[async_trait]
|
|
impl Provider for CopilotProvider {
|
|
async fn chat_with_system(
|
|
&self,
|
|
system_prompt: Option<&str>,
|
|
message: &str,
|
|
model: &str,
|
|
temperature: f64,
|
|
) -> anyhow::Result<String> {
|
|
let mut messages = Vec::new();
|
|
if let Some(system) = system_prompt {
|
|
messages.push(ApiMessage {
|
|
role: "system".to_string(),
|
|
content: Some(system.to_string()),
|
|
tool_call_id: None,
|
|
tool_calls: None,
|
|
});
|
|
}
|
|
messages.push(ApiMessage {
|
|
role: "user".to_string(),
|
|
content: Some(message.to_string()),
|
|
tool_call_id: None,
|
|
tool_calls: None,
|
|
});
|
|
|
|
let response = self
|
|
.send_chat_request(messages, None, model, temperature)
|
|
.await?;
|
|
Ok(response.text.unwrap_or_default())
|
|
}
|
|
|
|
async fn chat_with_history(
|
|
&self,
|
|
messages: &[ChatMessage],
|
|
model: &str,
|
|
temperature: f64,
|
|
) -> anyhow::Result<String> {
|
|
let response = self
|
|
.send_chat_request(Self::convert_messages(messages), None, model, temperature)
|
|
.await?;
|
|
Ok(response.text.unwrap_or_default())
|
|
}
|
|
|
|
async fn chat(
|
|
&self,
|
|
request: ProviderChatRequest<'_>,
|
|
model: &str,
|
|
temperature: f64,
|
|
) -> anyhow::Result<ProviderChatResponse> {
|
|
self.send_chat_request(
|
|
Self::convert_messages(request.messages),
|
|
request.tools,
|
|
model,
|
|
temperature,
|
|
)
|
|
.await
|
|
}
|
|
|
|
fn supports_native_tools(&self) -> bool {
|
|
true
|
|
}
|
|
|
|
async fn warmup(&self) -> anyhow::Result<()> {
|
|
let _ = self.get_api_key().await?;
|
|
Ok(())
|
|
}
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use super::*;
|
|
|
|
#[test]
|
|
fn new_without_token() {
|
|
let provider = CopilotProvider::new(None);
|
|
assert!(provider.github_token.is_none());
|
|
}
|
|
|
|
#[test]
|
|
fn new_with_token() {
|
|
let provider = CopilotProvider::new(Some("ghp_test"));
|
|
assert_eq!(provider.github_token.as_deref(), Some("ghp_test"));
|
|
}
|
|
|
|
#[test]
|
|
fn empty_token_treated_as_none() {
|
|
let provider = CopilotProvider::new(Some(""));
|
|
assert!(provider.github_token.is_none());
|
|
}
|
|
|
|
#[tokio::test]
|
|
async fn cache_starts_empty() {
|
|
let provider = CopilotProvider::new(None);
|
|
let cached = provider.refresh_lock.lock().await;
|
|
assert!(cached.is_none());
|
|
}
|
|
|
|
#[test]
|
|
fn copilot_headers_include_required_fields() {
|
|
let headers = CopilotProvider::COPILOT_HEADERS;
|
|
assert!(headers
|
|
.iter()
|
|
.any(|(header, _)| *header == "Editor-Version"));
|
|
assert!(headers
|
|
.iter()
|
|
.any(|(header, _)| *header == "Editor-Plugin-Version"));
|
|
assert!(headers.iter().any(|(header, _)| *header == "User-Agent"));
|
|
}
|
|
|
|
#[test]
|
|
fn default_interval_and_expiry() {
|
|
assert_eq!(default_interval(), 5);
|
|
assert_eq!(default_expires_in(), 900);
|
|
}
|
|
|
|
#[test]
|
|
fn supports_native_tools() {
|
|
let provider = CopilotProvider::new(None);
|
|
assert!(provider.supports_native_tools());
|
|
}
|
|
}
|