feat: add google maps mcp source (#125)

apps/freya-backend/package.json

@@ -18,6 +18,7 @@
 		"@freya/core": "workspace:*",
 		"@freya/source-caldav": "workspace:*",
 		"@freya/source-google-calendar": "workspace:*",
+		"@freya/source-google-maps": "workspace:*",
 		"@freya/source-location": "workspace:*",
 		"@freya/source-tfl": "workspace:*",
 		"@freya/source-weatherkit": "workspace:*",

apps/freya-backend/src/google-maps/provider.test.ts

@@ -0,0 +1,55 @@
+import type { GoogleMapsSourceOptions } from "@freya/source-google-maps"
+
+import { describe, expect, test } from "bun:test"
+
+import { GoogleMapsSourceProvider } from "./provider.ts"
+
+type McpClient = NonNullable<GoogleMapsSourceOptions["client"]>
+
+class MockMcpClient implements McpClient {
+	async listTools(): ReturnType<McpClient["listTools"]> {
+		return { tools: [] }
+	}
+
+	async readResource(
+		_params: Parameters<McpClient["readResource"]>[0],
+	): ReturnType<McpClient["readResource"]> {
+		throw new Error("unexpected resource read")
+	}
+
+	async callTool(_params: Parameters<McpClient["callTool"]>[0]): ReturnType<McpClient["callTool"]> {
+		return { structuredContent: {} }
+	}
+}
+
+describe("GoogleMapsSourceProvider", () => {
+	test("sourceId is freya.google-maps", () => {
+		const provider = new GoogleMapsSourceProvider({ apiKey: "key" })
+		expect(provider.sourceId).toBe("freya.google-maps")
+	})
+
+	test("throws when service API key is empty", () => {
+		expect(() => new GoogleMapsSourceProvider({ apiKey: "" })).toThrow(
+			"Google Maps MCP API key must be configured",
+		)
+	})
+
+	test("returns source with service API key", async () => {
+		const provider = new GoogleMapsSourceProvider({ apiKey: "key" })
+
+		const source = await provider.feedSourceForUser("user-1", {}, null)
+
+		expect(source.id).toBe("freya.google-maps")
+	})
+
+	test("allows injected test client with service API key", async () => {
+		const provider = new GoogleMapsSourceProvider({
+			apiKey: "key",
+			client: new MockMcpClient(),
+		})
+
+		const source = await provider.feedSourceForUser("user-1", {}, null)
+
+		expect(source.id).toBe("freya.google-maps")
+	})
+})

apps/freya-backend/src/google-maps/provider.ts

@@ -0,0 +1,39 @@
+import { GoogleMapsSource, type GoogleMapsSourceOptions } from "@freya/source-google-maps"
+
+import type { FeedSourceProvider } from "../session/feed-source-provider.ts"
+
+export interface GoogleMapsSourceProviderOptions {
+	readonly apiKey: string
+	readonly client?: GoogleMapsSourceOptions["client"]
+}
+
+export class GoogleMapsSourceProvider implements FeedSourceProvider {
+	readonly sourceId = "freya.google-maps"
+
+	private readonly apiKey: string
+	private readonly client: GoogleMapsSourceProviderOptions["client"]
+
+	constructor(options: GoogleMapsSourceProviderOptions) {
+		if (!nonEmptyString(options.apiKey)) {
+			throw new Error("Google Maps MCP API key must be configured")
+		}
+
+		this.apiKey = options.apiKey
+		this.client = options.client
+	}
+
+	async feedSourceForUser(
+		_userId: string,
+		_config: unknown,
+		_credentials: unknown,
+	): Promise<GoogleMapsSource> {
+		return new GoogleMapsSource({
+			apiKey: this.apiKey,
+			client: this.client,
+		})
+	}
+}
+
+function nonEmptyString(value: string): boolean {
+	return typeof value === "string" && value.trim().length > 0
+}

apps/freya-backend/src/server.ts

@@ -11,6 +11,7 @@ import { createDatabase } from "./db/index.ts"
 import { registerFeedHttpHandlers } from "./engine/http.ts"
 import { createFeedEnhancer } from "./enhancement/enhance-feed.ts"
 import { createLlmClient } from "./enhancement/llm-client.ts"
+import { GoogleMapsSourceProvider } from "./google-maps/provider.ts"
 import { CredentialEncryptor } from "./lib/crypto.ts"
 import { registerLocationHttpHandlers } from "./location/http.ts"
 import { LocationSourceProvider } from "./location/provider.ts"
@@ -47,6 +48,11 @@ function main() {
 		)
 	}
 
+	const googleMapsApiKey = process.env.GOOGLE_MAPS_API_KEY ?? process.env.GOOGLE_MAPS_MCP_API_KEY
+	if (!googleMapsApiKey) {
+		throw new Error("GOOGLE_MAPS_API_KEY or GOOGLE_MAPS_MCP_API_KEY must be set")
+	}
+
 	const sessionManager = new UserSessionManager({
 		db,
 		providers: [
@@ -62,6 +68,9 @@ function main() {
 			}),
 			new TflSourceProvider({ apiKey: process.env.TFL_API_KEY! }),
 			new WebSearchSourceProvider({ apiKey: process.env.EXA_API_KEY }),
+			new GoogleMapsSourceProvider({
+				apiKey: googleMapsApiKey,
+			}),
 		],
 		feedEnhancer,
 		credentialEncryptor,