feat: add OpenRouter embedding provider support (#8973)

* feat: add OpenRouter embedding provider support

Implement comprehensive OpenRouter embedding provider support for codebase indexing with the following features:

- New OpenRouterEmbedder class with full API compatibility
- Support for OpenRouter's OpenAI-compatible embedding endpoint
- Rate limiting and retry logic with exponential backoff
- Base64 embedding handling to bypass OpenAI package limitations
- Global rate limit state management across embedder instances
- Configuration updates for API key storage and provider selection
- UI integration for OpenRouter provider settings
- Comprehensive test suite with mocking
- Model dimension support for OpenRouter's embedding models

This adds OpenRouter as the 7th supported embedding provider alongside OpenAI, Ollama, OpenAI-compatible, Gemini, Mistral, and Vercel AI Gateway.

* Add translation key

* Fix mutex double release bug

* Add translations

* Add more translations

* Fix failing tests

* code-index(openrouter): fix HTTP-Referer header to RooCodeInc/Roo-Code; i18n: add and wire OpenRouter Code Index strings; test: assert default headers in embedder

---------

Co-authored-by: daniel-lxs <[email protected]>

Author: dmarkey

packages/types/src/codebase-index.ts

@@ -22,7 +22,7 @@ export const codebaseIndexConfigSchema = z.object({
 	codebaseIndexEnabled: z.boolean().optional(),
 	codebaseIndexQdrantUrl: z.string().optional(),
 	codebaseIndexEmbedderProvider: z
-		.enum(["openai", "ollama", "openai-compatible", "gemini", "mistral", "vercel-ai-gateway"])
+		.enum(["openai", "ollama", "openai-compatible", "gemini", "mistral", "vercel-ai-gateway", "openrouter"])
 		.optional(),
 	codebaseIndexEmbedderBaseUrl: z.string().optional(),
 	codebaseIndexEmbedderModelId: z.string().optional(),
@@ -51,6 +51,7 @@ export const codebaseIndexModelsSchema = z.object({
 	gemini: z.record(z.string(), z.object({ dimension: z.number() })).optional(),
 	mistral: z.record(z.string(), z.object({ dimension: z.number() })).optional(),
 	"vercel-ai-gateway": z.record(z.string(), z.object({ dimension: z.number() })).optional(),
+	openrouter: z.record(z.string(), z.object({ dimension: z.number() })).optional(),
 })
 
 export type CodebaseIndexModels = z.infer<typeof codebaseIndexModelsSchema>
@@ -68,6 +69,7 @@ export const codebaseIndexProviderSchema = z.object({
 	codebaseIndexGeminiApiKey: z.string().optional(),
 	codebaseIndexMistralApiKey: z.string().optional(),
 	codebaseIndexVercelAiGatewayApiKey: z.string().optional(),
+	codebaseIndexOpenRouterApiKey: z.string().optional(),
 })
 
 export type CodebaseIndexProvider = z.infer<typeof codebaseIndexProviderSchema>

packages/types/src/global-settings.ts

@@ -232,6 +232,7 @@ export const SECRET_STATE_KEYS = [
 	"codebaseIndexGeminiApiKey",
 	"codebaseIndexMistralApiKey",
 	"codebaseIndexVercelAiGatewayApiKey",
+	"codebaseIndexOpenRouterApiKey",
 	"huggingFaceApiKey",
 	"sambaNovaApiKey",
 	"zaiApiKey",

src/core/webview/webviewMessageHandler.ts

@@ -2556,6 +2556,12 @@ export const webviewMessageHandler = async (
 						settings.codebaseIndexVercelAiGatewayApiKey,
 					)
 				}
+				if (settings.codebaseIndexOpenRouterApiKey !== undefined) {
+					await provider.contextProxy.storeSecret(
+						"codebaseIndexOpenRouterApiKey",
+						settings.codebaseIndexOpenRouterApiKey,
+					)
+				}
 
 				// Send success response first - settings are saved regardless of validation
 				await provider.postMessageToWebview({
@@ -2693,6 +2699,7 @@ export const webviewMessageHandler = async (
 			const hasVercelAiGatewayApiKey = !!(await provider.context.secrets.get(
 				"codebaseIndexVercelAiGatewayApiKey",
 			))
+			const hasOpenRouterApiKey = !!(await provider.context.secrets.get("codebaseIndexOpenRouterApiKey"))
 
 			provider.postMessageToWebview({
 				type: "codeIndexSecretStatus",
@@ -2703,6 +2710,7 @@ export const webviewMessageHandler = async (
 					hasGeminiApiKey,
 					hasMistralApiKey,
 					hasVercelAiGatewayApiKey,
+					hasOpenRouterApiKey,
 				},
 			})
 			break

src/i18n/locales/ca/embeddings.json

@@ -47,6 +47,7 @@
 		"openAiCompatibleConfigMissing": "OpenAI Compatible configuration missing for embedder creation",
 		"geminiConfigMissing": "Gemini configuration missing for embedder creation",
 		"mistralConfigMissing": "Mistral configuration missing for embedder creation",
+		"openRouterConfigMissing": "OpenRouter configuration missing for embedder creation",
 		"vercelAiGatewayConfigMissing": "Vercel AI Gateway configuration missing for embedder creation",
 		"invalidEmbedderType": "Invalid embedder type configured: {{embedderProvider}}",
 		"vectorDimensionNotDeterminedOpenAiCompatible": "Could not determine vector dimension for model '{{modelId}}' with provider '{{provider}}'. Please ensure the 'Embedding Dimension' is correctly set in the OpenAI-Compatible provider settings.",