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src/constants.js

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+/**
+ * Constants for Antigravity Cloud Code API integration
+ * Based on: https://github.com/NoeFabris/opencode-antigravity-auth
+ */
+
+// Cloud Code API endpoints (in fallback order)
+export const ANTIGRAVITY_ENDPOINT_DAILY = 'https://daily-cloudcode-pa.sandbox.googleapis.com';
+export const ANTIGRAVITY_ENDPOINT_AUTOPUSH = 'https://autopush-cloudcode-pa.sandbox.googleapis.com';
+export const ANTIGRAVITY_ENDPOINT_PROD = 'https://cloudcode-pa.googleapis.com';
+
+// Endpoint fallback order (daily → autopush → prod)
+export const ANTIGRAVITY_ENDPOINT_FALLBACKS = [
+    ANTIGRAVITY_ENDPOINT_DAILY,
+    ANTIGRAVITY_ENDPOINT_AUTOPUSH,
+    ANTIGRAVITY_ENDPOINT_PROD
+];
+
+// Primary endpoint
+export const ANTIGRAVITY_ENDPOINT = ANTIGRAVITY_ENDPOINT_DAILY;
+
+// Required headers for Antigravity API requests
+export const ANTIGRAVITY_HEADERS = {
+    'User-Agent': 'antigravity/1.11.5 darwin/arm64',
+    'X-Goog-Api-Client': 'google-cloud-sdk vscode_cloudshelleditor/0.1',
+    'Client-Metadata': JSON.stringify({
+        ideType: 'IDE_UNSPECIFIED',
+        platform: 'PLATFORM_UNSPECIFIED',
+        pluginType: 'GEMINI'
+    })
+};
+
+// Model name mappings: Anthropic format → Antigravity format
+export const MODEL_MAPPINGS = {
+    // Claude models
+    'claude-3-opus-20240229': 'claude-opus-4-5-thinking',
+    'claude-3-5-opus-20240229': 'claude-opus-4-5-thinking',
+    'claude-3-5-sonnet-20241022': 'claude-sonnet-4-5',
+    'claude-3-5-sonnet-20240620': 'claude-sonnet-4-5',
+    'claude-3-sonnet-20240229': 'claude-sonnet-4-5',
+    'claude-sonnet-4-5': 'claude-sonnet-4-5',
+    'claude-sonnet-4-5-thinking': 'claude-sonnet-4-5-thinking',
+    'claude-opus-4-5-thinking': 'claude-opus-4-5-thinking'
+};
+
+// Available models exposed by this proxy
+export const AVAILABLE_MODELS = [
+    {
+        id: 'claude-sonnet-4-5',
+        name: 'Claude Sonnet 4.5 (Antigravity)',
+        description: 'Claude Sonnet 4.5 via Antigravity Cloud Code',
+        context: 200000,
+        output: 64000
+    },
+    {
+        id: 'claude-sonnet-4-5-thinking',
+        name: 'Claude Sonnet 4.5 Thinking (Antigravity)',
+        description: 'Claude Sonnet 4.5 with extended thinking via Antigravity',
+        context: 200000,
+        output: 64000
+    },
+    {
+        id: 'claude-opus-4-5-thinking',
+        name: 'Claude Opus 4.5 Thinking (Antigravity)',
+        description: 'Claude Opus 4.5 with extended thinking via Antigravity',
+        context: 200000,
+        output: 64000
+    }
+];
+
+// Default project ID if none can be discovered
+export const DEFAULT_PROJECT_ID = 'rising-fact-p41fc';
+
+// Centralized configuration constants
+export const STREAMING_CHUNK_SIZE = 20;
+export const TOKEN_REFRESH_INTERVAL_MS = 5 * 60 * 1000; // 5 minutes
+export const REQUEST_BODY_LIMIT = '50mb';
+export const ANTIGRAVITY_AUTH_PORT = 9092;
+export const DEFAULT_PORT = 8080;
+
+export default {
+    ANTIGRAVITY_ENDPOINT,
+    ANTIGRAVITY_ENDPOINT_FALLBACKS,
+    ANTIGRAVITY_HEADERS,
+    MODEL_MAPPINGS,
+    AVAILABLE_MODELS,
+    DEFAULT_PROJECT_ID,
+    STREAMING_CHUNK_SIZE,
+    TOKEN_REFRESH_INTERVAL_MS,
+    REQUEST_BODY_LIMIT,
+    ANTIGRAVITY_AUTH_PORT,
+    DEFAULT_PORT
+};