699 lines
23 KiB
Rust
699 lines
23 KiB
Rust
//! Google Gemini provider with support for:
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//! - Direct API key (`GEMINI_API_KEY` env var or config)
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//! - Gemini CLI OAuth tokens (reuse existing ~/.gemini/ authentication)
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//! - Google Cloud ADC (`GOOGLE_APPLICATION_CREDENTIALS`)
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use crate::providers::traits::Provider;
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use async_trait::async_trait;
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use directories::UserDirs;
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use reqwest::Client;
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use serde::{Deserialize, Serialize};
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use std::path::PathBuf;
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/// Gemini provider supporting multiple authentication methods.
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pub struct GeminiProvider {
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auth: Option<GeminiAuth>,
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client: Client,
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}
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/// Resolved credential — the variant determines both the HTTP auth method
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/// and the diagnostic label returned by `auth_source()`.
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#[derive(Debug)]
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enum GeminiAuth {
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/// Explicit API key from config: sent as `?key=` query parameter.
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ExplicitKey(String),
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/// API key from `GEMINI_API_KEY` env var: sent as `?key=`.
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EnvGeminiKey(String),
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/// API key from `GOOGLE_API_KEY` env var: sent as `?key=`.
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EnvGoogleKey(String),
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/// OAuth access token from Gemini CLI: sent as `Authorization: Bearer`.
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OAuthToken(String),
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}
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impl GeminiAuth {
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/// Whether this credential is an API key (sent as `?key=` query param).
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fn is_api_key(&self) -> bool {
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matches!(
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self,
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GeminiAuth::ExplicitKey(_) | GeminiAuth::EnvGeminiKey(_) | GeminiAuth::EnvGoogleKey(_)
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)
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}
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/// Whether this credential is an OAuth token from Gemini CLI.
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fn is_oauth(&self) -> bool {
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matches!(self, GeminiAuth::OAuthToken(_))
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}
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/// The raw credential string.
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fn credential(&self) -> &str {
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match self {
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GeminiAuth::ExplicitKey(s)
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| GeminiAuth::EnvGeminiKey(s)
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| GeminiAuth::EnvGoogleKey(s)
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| GeminiAuth::OAuthToken(s) => s,
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}
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}
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}
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// ══════════════════════════════════════════════════════════════════════════════
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// API REQUEST/RESPONSE TYPES
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// ══════════════════════════════════════════════════════════════════════════════
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#[derive(Debug, Serialize)]
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struct GenerateContentRequest {
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contents: Vec<Content>,
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#[serde(skip_serializing_if = "Option::is_none")]
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system_instruction: Option<Content>,
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#[serde(rename = "generationConfig")]
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generation_config: GenerationConfig,
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}
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/// Request envelope for the internal cloudcode-pa API.
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/// OAuth tokens from Gemini CLI are scoped for this endpoint.
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#[derive(Debug, Serialize)]
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struct InternalGenerateContentRequest {
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model: String,
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#[serde(rename = "generationConfig")]
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generation_config: GenerationConfig,
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contents: Vec<Content>,
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#[serde(skip_serializing_if = "Option::is_none")]
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system_instruction: Option<Content>,
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}
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#[derive(Debug, Serialize)]
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struct Content {
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#[serde(skip_serializing_if = "Option::is_none")]
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role: Option<String>,
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parts: Vec<Part>,
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}
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#[derive(Debug, Serialize)]
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struct Part {
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text: String,
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}
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#[derive(Debug, Serialize, Clone)]
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struct GenerationConfig {
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temperature: f64,
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#[serde(rename = "maxOutputTokens")]
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max_output_tokens: u32,
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}
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#[derive(Debug, Deserialize)]
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struct GenerateContentResponse {
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candidates: Option<Vec<Candidate>>,
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error: Option<ApiError>,
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}
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#[derive(Debug, Deserialize)]
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struct Candidate {
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content: CandidateContent,
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}
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#[derive(Debug, Deserialize)]
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struct CandidateContent {
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parts: Vec<ResponsePart>,
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}
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#[derive(Debug, Deserialize)]
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struct ResponsePart {
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text: Option<String>,
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}
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#[derive(Debug, Deserialize)]
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struct ApiError {
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message: String,
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}
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// ══════════════════════════════════════════════════════════════════════════════
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// GEMINI CLI TOKEN STRUCTURES
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// ══════════════════════════════════════════════════════════════════════════════
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/// OAuth token stored by Gemini CLI in `~/.gemini/oauth_creds.json`
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#[derive(Debug, Deserialize)]
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struct GeminiCliOAuthCreds {
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access_token: Option<String>,
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expiry: Option<String>,
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}
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/// Internal API endpoint used by Gemini CLI for OAuth users.
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/// See: https://github.com/google-gemini/gemini-cli/issues/19200
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const CLOUDCODE_PA_ENDPOINT: &str = "https://cloudcode-pa.googleapis.com/v1internal";
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/// Public API endpoint for API key users.
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const PUBLIC_API_ENDPOINT: &str = "https://generativelanguage.googleapis.com/v1beta";
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impl GeminiProvider {
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/// Create a new Gemini provider.
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///
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/// Authentication priority:
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/// 1. Explicit API key passed in
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/// 2. `GEMINI_API_KEY` environment variable
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/// 3. `GOOGLE_API_KEY` environment variable
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/// 4. Gemini CLI OAuth tokens (`~/.gemini/oauth_creds.json`)
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pub fn new(api_key: Option<&str>) -> Self {
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let resolved_auth = api_key
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.and_then(Self::normalize_non_empty)
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.map(GeminiAuth::ExplicitKey)
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.or_else(|| Self::load_non_empty_env("GEMINI_API_KEY").map(GeminiAuth::EnvGeminiKey))
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.or_else(|| Self::load_non_empty_env("GOOGLE_API_KEY").map(GeminiAuth::EnvGoogleKey))
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.or_else(|| Self::try_load_gemini_cli_token().map(GeminiAuth::OAuthToken));
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Self {
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auth: resolved_auth,
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client: Client::builder()
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.timeout(std::time::Duration::from_secs(120))
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.connect_timeout(std::time::Duration::from_secs(10))
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.build()
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.unwrap_or_else(|_| Client::new()),
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}
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}
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fn normalize_non_empty(value: &str) -> Option<String> {
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let trimmed = value.trim();
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if trimmed.is_empty() {
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None
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} else {
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Some(trimmed.to_string())
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}
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}
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fn load_non_empty_env(name: &str) -> Option<String> {
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std::env::var(name)
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.ok()
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.and_then(|value| Self::normalize_non_empty(&value))
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}
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/// Try to load OAuth access token from Gemini CLI's cached credentials.
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/// Location: `~/.gemini/oauth_creds.json`
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fn try_load_gemini_cli_token() -> Option<String> {
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let gemini_dir = Self::gemini_cli_dir()?;
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let creds_path = gemini_dir.join("oauth_creds.json");
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if !creds_path.exists() {
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return None;
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}
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let content = std::fs::read_to_string(&creds_path).ok()?;
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let creds: GeminiCliOAuthCreds = serde_json::from_str(&content).ok()?;
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// Check if token is expired (basic check)
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if let Some(ref expiry) = creds.expiry {
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if let Ok(expiry_time) = chrono::DateTime::parse_from_rfc3339(expiry) {
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if expiry_time < chrono::Utc::now() {
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tracing::warn!("Gemini CLI OAuth token expired — re-run `gemini` to refresh");
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return None;
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}
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}
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}
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creds
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.access_token
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.and_then(|token| Self::normalize_non_empty(&token))
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}
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/// Get the Gemini CLI config directory (~/.gemini)
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fn gemini_cli_dir() -> Option<PathBuf> {
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UserDirs::new().map(|u| u.home_dir().join(".gemini"))
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}
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/// Check if Gemini CLI is configured and has valid credentials
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pub fn has_cli_credentials() -> bool {
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Self::try_load_gemini_cli_token().is_some()
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}
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/// Check if any Gemini authentication is available
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pub fn has_any_auth() -> bool {
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Self::load_non_empty_env("GEMINI_API_KEY").is_some()
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|| Self::load_non_empty_env("GOOGLE_API_KEY").is_some()
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|| Self::has_cli_credentials()
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}
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/// Get authentication source description for diagnostics.
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/// Uses the stored enum variant — no env var re-reading at call time.
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pub fn auth_source(&self) -> &'static str {
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match self.auth.as_ref() {
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Some(GeminiAuth::ExplicitKey(_)) => "config",
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Some(GeminiAuth::EnvGeminiKey(_)) => "GEMINI_API_KEY env var",
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Some(GeminiAuth::EnvGoogleKey(_)) => "GOOGLE_API_KEY env var",
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Some(GeminiAuth::OAuthToken(_)) => "Gemini CLI OAuth",
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None => "none",
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}
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}
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fn format_model_name(model: &str) -> String {
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if model.starts_with("models/") {
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model.to_string()
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} else {
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format!("models/{model}")
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}
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}
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/// Build the API URL based on auth type.
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///
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/// - API key users → public `generativelanguage.googleapis.com/v1beta`
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/// - OAuth users → internal `cloudcode-pa.googleapis.com/v1internal`
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///
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/// The Gemini CLI OAuth tokens are scoped for the internal Code Assist API,
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/// not the public API. Sending them to the public endpoint results in
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/// "400 Bad Request: API key not valid" errors.
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/// See: https://github.com/google-gemini/gemini-cli/issues/19200
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fn build_generate_content_url(model: &str, auth: &GeminiAuth) -> String {
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match auth {
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GeminiAuth::OAuthToken(_) => {
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// OAuth tokens from Gemini CLI are scoped for the internal
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// Code Assist API. The model is passed in the request body,
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// not the URL path.
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format!("{CLOUDCODE_PA_ENDPOINT}:generateContent")
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}
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_ => {
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let model_name = Self::format_model_name(model);
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let base_url = format!("{PUBLIC_API_ENDPOINT}/{model_name}:generateContent");
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if auth.is_api_key() {
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format!("{base_url}?key={}", auth.credential())
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} else {
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base_url
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}
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}
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}
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}
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fn build_generate_content_request(
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&self,
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auth: &GeminiAuth,
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url: &str,
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request: &GenerateContentRequest,
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model: &str,
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) -> reqwest::RequestBuilder {
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match auth {
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GeminiAuth::OAuthToken(token) => {
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// Internal API expects the model in the request body envelope
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let internal_request = InternalGenerateContentRequest {
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model: Self::format_model_name(model),
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generation_config: request.generation_config.clone(),
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contents: request
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.contents
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.iter()
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.map(|c| Content {
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role: c.role.clone(),
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parts: c
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.parts
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.iter()
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.map(|p| Part {
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text: p.text.clone(),
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})
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.collect(),
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})
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.collect(),
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system_instruction: request.system_instruction.as_ref().map(|si| Content {
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role: si.role.clone(),
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parts: si
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.parts
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.iter()
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.map(|p| Part {
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text: p.text.clone(),
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})
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.collect(),
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}),
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};
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self.client
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.post(url)
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.json(&internal_request)
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.bearer_auth(token)
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}
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_ => self.client.post(url).json(request),
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}
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}
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}
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#[async_trait]
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impl Provider for GeminiProvider {
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async fn chat_with_system(
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&self,
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system_prompt: Option<&str>,
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message: &str,
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model: &str,
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temperature: f64,
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) -> anyhow::Result<String> {
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let auth = self.auth.as_ref().ok_or_else(|| {
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anyhow::anyhow!(
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"Gemini API key not found. Options:\n\
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1. Set GEMINI_API_KEY env var\n\
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2. Run `gemini` CLI to authenticate (tokens will be reused)\n\
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3. Get an API key from https://aistudio.google.com/app/apikey\n\
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4. Run `zeroclaw onboard` to configure"
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)
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})?;
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// Build request
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let system_instruction = system_prompt.map(|sys| Content {
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role: None,
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parts: vec![Part {
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text: sys.to_string(),
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}],
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});
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let request = GenerateContentRequest {
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contents: vec![Content {
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role: Some("user".to_string()),
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parts: vec![Part {
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text: message.to_string(),
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}],
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}],
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system_instruction,
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generation_config: GenerationConfig {
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temperature,
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max_output_tokens: 8192,
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},
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};
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let url = Self::build_generate_content_url(model, auth);
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let response = self
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.build_generate_content_request(auth, &url, &request, model)
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.send()
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.await?;
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if !response.status().is_success() {
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let status = response.status();
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let error_text = response.text().await.unwrap_or_default();
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anyhow::bail!("Gemini API error ({status}): {error_text}");
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}
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let result: GenerateContentResponse = response.json().await?;
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// Check for API error in response body
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if let Some(err) = result.error {
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anyhow::bail!("Gemini API error: {}", err.message);
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}
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// Extract text from response
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result
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.candidates
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.and_then(|c| c.into_iter().next())
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.and_then(|c| c.content.parts.into_iter().next())
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.and_then(|p| p.text)
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.ok_or_else(|| anyhow::anyhow!("No response from Gemini"))
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}
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async fn warmup(&self) -> anyhow::Result<()> {
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if let Some(auth) = self.auth.as_ref() {
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let url = if auth.is_api_key() {
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format!(
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"https://generativelanguage.googleapis.com/v1beta/models?key={}",
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auth.credential()
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)
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} else {
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"https://generativelanguage.googleapis.com/v1beta/models".to_string()
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};
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let mut request = self.client.get(&url);
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if let GeminiAuth::OAuthToken(token) = auth {
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request = request.bearer_auth(token);
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}
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request.send().await?.error_for_status()?;
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}
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Ok(())
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use reqwest::header::AUTHORIZATION;
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#[test]
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fn normalize_non_empty_trims_and_filters() {
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assert_eq!(
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GeminiProvider::normalize_non_empty(" value "),
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Some("value".into())
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);
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assert_eq!(GeminiProvider::normalize_non_empty(""), None);
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assert_eq!(GeminiProvider::normalize_non_empty(" \t\n"), None);
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}
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#[test]
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fn provider_creates_without_key() {
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let provider = GeminiProvider::new(None);
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// May pick up env vars; just verify it doesn't panic
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let _ = provider.auth_source();
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}
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#[test]
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fn provider_creates_with_key() {
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let provider = GeminiProvider::new(Some("test-api-key"));
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assert!(matches!(
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provider.auth,
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Some(GeminiAuth::ExplicitKey(ref key)) if key == "test-api-key"
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));
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}
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#[test]
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fn provider_rejects_empty_key() {
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let provider = GeminiProvider::new(Some(""));
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assert!(!matches!(provider.auth, Some(GeminiAuth::ExplicitKey(_))));
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}
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#[test]
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fn gemini_cli_dir_returns_path() {
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let dir = GeminiProvider::gemini_cli_dir();
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// Should return Some on systems with home dir
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if UserDirs::new().is_some() {
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assert!(dir.is_some());
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assert!(dir.unwrap().ends_with(".gemini"));
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}
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}
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#[test]
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fn auth_source_explicit_key() {
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let provider = GeminiProvider {
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auth: Some(GeminiAuth::ExplicitKey("key".into())),
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client: Client::new(),
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};
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assert_eq!(provider.auth_source(), "config");
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}
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#[test]
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fn auth_source_none_without_credentials() {
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let provider = GeminiProvider {
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auth: None,
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client: Client::new(),
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};
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assert_eq!(provider.auth_source(), "none");
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}
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#[test]
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fn auth_source_oauth() {
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let provider = GeminiProvider {
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auth: Some(GeminiAuth::OAuthToken("ya29.mock".into())),
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client: Client::new(),
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};
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assert_eq!(provider.auth_source(), "Gemini CLI OAuth");
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}
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|
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#[test]
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fn model_name_formatting() {
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assert_eq!(
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GeminiProvider::format_model_name("gemini-2.0-flash"),
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"models/gemini-2.0-flash"
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);
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assert_eq!(
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GeminiProvider::format_model_name("models/gemini-1.5-pro"),
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"models/gemini-1.5-pro"
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);
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}
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#[test]
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fn api_key_url_includes_key_query_param() {
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let auth = GeminiAuth::ExplicitKey("api-key-123".into());
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let url = GeminiProvider::build_generate_content_url("gemini-2.0-flash", &auth);
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assert!(url.contains(":generateContent?key=api-key-123"));
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}
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#[test]
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fn oauth_url_uses_internal_endpoint() {
|
|
let auth = GeminiAuth::OAuthToken("ya29.test-token".into());
|
|
let url = GeminiProvider::build_generate_content_url("gemini-2.0-flash", &auth);
|
|
assert!(url.starts_with("https://cloudcode-pa.googleapis.com/v1internal"));
|
|
assert!(url.ends_with(":generateContent"));
|
|
assert!(!url.contains("generativelanguage.googleapis.com"));
|
|
assert!(!url.contains("?key="));
|
|
}
|
|
|
|
#[test]
|
|
fn api_key_url_uses_public_endpoint() {
|
|
let auth = GeminiAuth::ExplicitKey("api-key-123".into());
|
|
let url = GeminiProvider::build_generate_content_url("gemini-2.0-flash", &auth);
|
|
assert!(url.contains("generativelanguage.googleapis.com/v1beta"));
|
|
assert!(url.contains("models/gemini-2.0-flash"));
|
|
}
|
|
|
|
#[test]
|
|
fn oauth_request_uses_bearer_auth_header() {
|
|
let provider = GeminiProvider {
|
|
auth: Some(GeminiAuth::OAuthToken("ya29.mock-token".into())),
|
|
client: Client::new(),
|
|
};
|
|
let auth = GeminiAuth::OAuthToken("ya29.mock-token".into());
|
|
let url = GeminiProvider::build_generate_content_url("gemini-2.0-flash", &auth);
|
|
let body = GenerateContentRequest {
|
|
contents: vec![Content {
|
|
role: Some("user".into()),
|
|
parts: vec![Part {
|
|
text: "hello".into(),
|
|
}],
|
|
}],
|
|
system_instruction: None,
|
|
generation_config: GenerationConfig {
|
|
temperature: 0.7,
|
|
max_output_tokens: 8192,
|
|
},
|
|
};
|
|
|
|
let request = provider
|
|
.build_generate_content_request(&auth, &url, &body, "gemini-2.0-flash")
|
|
.build()
|
|
.unwrap();
|
|
|
|
assert_eq!(
|
|
request
|
|
.headers()
|
|
.get(AUTHORIZATION)
|
|
.and_then(|h| h.to_str().ok()),
|
|
Some("Bearer ya29.mock-token")
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn api_key_request_does_not_set_bearer_header() {
|
|
let provider = GeminiProvider {
|
|
auth: Some(GeminiAuth::ExplicitKey("api-key-123".into())),
|
|
client: Client::new(),
|
|
};
|
|
let auth = GeminiAuth::ExplicitKey("api-key-123".into());
|
|
let url = GeminiProvider::build_generate_content_url("gemini-2.0-flash", &auth);
|
|
let body = GenerateContentRequest {
|
|
contents: vec![Content {
|
|
role: Some("user".into()),
|
|
parts: vec![Part {
|
|
text: "hello".into(),
|
|
}],
|
|
}],
|
|
system_instruction: None,
|
|
generation_config: GenerationConfig {
|
|
temperature: 0.7,
|
|
max_output_tokens: 8192,
|
|
},
|
|
};
|
|
|
|
let request = provider
|
|
.build_generate_content_request(&auth, &url, &body, "gemini-2.0-flash")
|
|
.build()
|
|
.unwrap();
|
|
|
|
assert!(request.headers().get(AUTHORIZATION).is_none());
|
|
}
|
|
|
|
#[test]
|
|
fn request_serialization() {
|
|
let request = GenerateContentRequest {
|
|
contents: vec![Content {
|
|
role: Some("user".to_string()),
|
|
parts: vec![Part {
|
|
text: "Hello".to_string(),
|
|
}],
|
|
}],
|
|
system_instruction: Some(Content {
|
|
role: None,
|
|
parts: vec![Part {
|
|
text: "You are helpful".to_string(),
|
|
}],
|
|
}),
|
|
generation_config: GenerationConfig {
|
|
temperature: 0.7,
|
|
max_output_tokens: 8192,
|
|
},
|
|
};
|
|
|
|
let json = serde_json::to_string(&request).unwrap();
|
|
assert!(json.contains("\"role\":\"user\""));
|
|
assert!(json.contains("\"text\":\"Hello\""));
|
|
assert!(json.contains("\"temperature\":0.7"));
|
|
assert!(json.contains("\"maxOutputTokens\":8192"));
|
|
}
|
|
|
|
#[test]
|
|
fn internal_request_includes_model() {
|
|
let request = InternalGenerateContentRequest {
|
|
model: "models/gemini-3-pro-preview".to_string(),
|
|
generation_config: GenerationConfig {
|
|
temperature: 0.7,
|
|
max_output_tokens: 8192,
|
|
},
|
|
contents: vec![Content {
|
|
role: Some("user".to_string()),
|
|
parts: vec![Part {
|
|
text: "Hello".to_string(),
|
|
}],
|
|
}],
|
|
system_instruction: None,
|
|
};
|
|
|
|
let json = serde_json::to_string(&request).unwrap();
|
|
assert!(json.contains("\"model\":\"models/gemini-3-pro-preview\""));
|
|
assert!(json.contains("\"role\":\"user\""));
|
|
assert!(json.contains("\"temperature\":0.7"));
|
|
}
|
|
|
|
#[test]
|
|
fn response_deserialization() {
|
|
let json = r#"{
|
|
"candidates": [{
|
|
"content": {
|
|
"parts": [{"text": "Hello there!"}]
|
|
}
|
|
}]
|
|
}"#;
|
|
|
|
let response: GenerateContentResponse = serde_json::from_str(json).unwrap();
|
|
assert!(response.candidates.is_some());
|
|
let text = response
|
|
.candidates
|
|
.unwrap()
|
|
.into_iter()
|
|
.next()
|
|
.unwrap()
|
|
.content
|
|
.parts
|
|
.into_iter()
|
|
.next()
|
|
.unwrap()
|
|
.text;
|
|
assert_eq!(text, Some("Hello there!".to_string()));
|
|
}
|
|
|
|
#[test]
|
|
fn error_response_deserialization() {
|
|
let json = r#"{
|
|
"error": {
|
|
"message": "Invalid API key"
|
|
}
|
|
}"#;
|
|
|
|
let response: GenerateContentResponse = serde_json::from_str(json).unwrap();
|
|
assert!(response.error.is_some());
|
|
assert_eq!(response.error.unwrap().message, "Invalid API key");
|
|
}
|
|
|
|
#[tokio::test]
|
|
async fn warmup_without_key_is_noop() {
|
|
let provider = GeminiProvider {
|
|
auth: None,
|
|
client: Client::new(),
|
|
};
|
|
let result = provider.warmup().await;
|
|
assert!(result.is_ok());
|
|
}
|
|
}
|