Add GeminiModels handler and enhance API key validation

- Introduced `GeminiModels` handler to serve Gemini model information under `/v1beta/models`.
- Updated `AuthMiddleware` to validate API keys from query parameters for improved flexibility.
- Adjusted route to use the new handler for model retrieval.

internal/api/gemini-handlers.go

@@ -14,6 +14,22 @@ import (
 	"time"
 )
 
+func (h *APIHandlers) GeminiModels(c *gin.Context) {
+	c.Status(200)
+	c.Header("Content-Type", "application/json; charset=UTF-8")
+	_, _ = c.Writer.Write([]byte(`{"models":[{"name":"models/gemini-2.5-flash","version":"001","displayName":"Gemini `))
+	_, _ = c.Writer.Write([]byte(`2.5 Flash","description":"Stable version of Gemini 2.5 Flash, our mid-size multimod`))
+	_, _ = c.Writer.Write([]byte(`al model that supports up to 1 million tokens, released in June of 2025.","inputTok`))
+	_, _ = c.Writer.Write([]byte(`enLimit":1048576,"outputTokenLimit":65536,"supportedGenerationMethods":["generateCo`))
+	_, _ = c.Writer.Write([]byte(`ntent","countTokens","createCachedContent","batchGenerateContent"],"temperature":1,`))
+	_, _ = c.Writer.Write([]byte(`"topP":0.95,"topK":64,"maxTemperature":2,"thinking":true},{"name":"models/gemini-2.`))
+	_, _ = c.Writer.Write([]byte(`5-pro","version":"2.5","displayName":"Gemini 2.5 Pro","description":"Stable release`))
+	_, _ = c.Writer.Write([]byte(` (June 17th, 2025) of Gemini 2.5 Pro","inputTokenLimit":1048576,"outputTokenLimit":`))
+	_, _ = c.Writer.Write([]byte(`65536,"supportedGenerationMethods":["generateContent","countTokens","createCachedCo`))
+	_, _ = c.Writer.Write([]byte(`ntent","batchGenerateContent"],"temperature":1,"topP":0.95,"topK":64,"maxTemperatur`))
+	_, _ = c.Writer.Write([]byte(`e":2,"thinking":true}],"nextPageToken":""}`))
+}
+
 func (h *APIHandlers) GeminiHandler(c *gin.Context) {
 	var person struct {
 		Action string `uri:"action" binding:"required"`

internal/api/server.go

@@ -75,7 +75,7 @@ func (s *Server) setupRoutes() {
 	v1beta := s.engine.Group("/v1beta")
 	v1beta.Use(AuthMiddleware(s.cfg))
 	{
-		v1beta.GET("/models", s.handlers.Models)
+		v1beta.GET("/models", s.handlers.GeminiModels)
 		v1beta.POST("/models/:action", s.handlers.GeminiHandler)
 	}
 
@@ -151,7 +151,11 @@ func AuthMiddleware(cfg *config.Config) gin.HandlerFunc {
 		authHeader := c.GetHeader("Authorization")
 		authHeaderGoogle := c.GetHeader("X-Goog-Api-Key")
 		authHeaderAnthropic := c.GetHeader("X-Api-Key")
-		if authHeader == "" && authHeaderGoogle == "" && authHeaderAnthropic == "" {
+
+		// Get the API key from the query parameter
+		apiKeyQuery, _ := c.GetQuery("key")
+
+		if authHeader == "" && authHeaderGoogle == "" && authHeaderAnthropic == "" && apiKeyQuery == "" {
 			c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{
 				"error": "Missing API key",
 			})
@@ -170,7 +174,7 @@ func AuthMiddleware(cfg *config.Config) gin.HandlerFunc {
 		// Find the API key in the in-memory list
 		var foundKey string
 		for i := range cfg.ApiKeys {
-			if cfg.ApiKeys[i] == apiKey || cfg.ApiKeys[i] == authHeaderGoogle || cfg.ApiKeys[i] == authHeaderAnthropic {
+			if cfg.ApiKeys[i] == apiKey || cfg.ApiKeys[i] == authHeaderGoogle || cfg.ApiKeys[i] == authHeaderAnthropic || cfg.ApiKeys[i] == apiKeyQuery {
 				foundKey = cfg.ApiKeys[i]
 				break
 			}