feat: key接口完善及错误处理

internal/channel/gemini_channel.go

@@ -1,11 +1,14 @@
 package channel
 
 import (
+	"bytes"
 	"context"
+	"encoding/json"
 	"fmt"
+	app_errors "gpt-load/internal/errors"
 	"gpt-load/internal/models"
+	"io"
 	"net/http"
-
 	"strings"
 
 	"github.com/gin-gonic/gin"
@@ -20,7 +23,7 @@ type GeminiChannel struct {
 }
 
 func newGeminiChannel(f *Factory, group *models.Group) (ChannelProxy, error) {
-	base, err := f.newBaseChannel("gemini", group.Upstreams, group.Config)
+	base, err := f.newBaseChannel("gemini", group.Upstreams, group.Config, group.TestModel)
 	if err != nil {
 		return nil, err
 	}
@@ -39,20 +42,35 @@ func (ch *GeminiChannel) Handle(c *gin.Context, apiKey *models.APIKey, group *mo
 	return ch.ProcessRequest(c, apiKey, modifier, ch)
 }
 
-// ValidateKey checks if the given API key is valid by making a request to the models endpoint.
+// ValidateKey checks if the given API key is valid by making a generateContent request.
 func (ch *GeminiChannel) ValidateKey(ctx context.Context, key string) (bool, error) {
 	upstreamURL := ch.getUpstreamURL()
 	if upstreamURL == nil {
 		return false, fmt.Errorf("no upstream URL configured for channel %s", ch.Name)
 	}
 
-	// Construct the request URL for listing models.
-	reqURL := fmt.Sprintf("%s/v1beta/models?key=%s", upstreamURL.String(), key)
+	// Use the test model specified in the group settings.
+	// The path format for Gemini is /v1beta/models/{model}:generateContent
+	reqURL := fmt.Sprintf("%s/v1beta/models/%s:generateContent?key=%s", upstreamURL.String(), ch.TestModel, key)
 
-	req, err := http.NewRequestWithContext(ctx, "GET", reqURL, nil)
+	// Use a minimal, low-cost payload for validation
+	payload := gin.H{
+		"contents": []gin.H{
+			{"parts": []gin.H{
+				{"text": "Only output 'ok'"},
+			}},
+		},
+	}
+	body, err := json.Marshal(payload)
+	if err != nil {
+		return false, fmt.Errorf("failed to marshal validation payload: %w", err)
+	}
+
+	req, err := http.NewRequestWithContext(ctx, "POST", reqURL, bytes.NewBuffer(body))
 	if err != nil {
 		return false, fmt.Errorf("failed to create validation request: %w", err)
 	}
+	req.Header.Set("Content-Type", "application/json")
 
 	resp, err := ch.HTTPClient.Do(req)
 	if err != nil {
@@ -61,7 +79,20 @@ func (ch *GeminiChannel) ValidateKey(ctx context.Context, key string) (bool, err
 	defer resp.Body.Close()
 
 	// A 200 OK status code indicates the key is valid.
-	return resp.StatusCode == http.StatusOK, nil
+	if resp.StatusCode == http.StatusOK {
+		return true, nil
+	}
+
+	// For non-200 responses, parse the body to provide a more specific error reason.
+	errorBody, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return false, fmt.Errorf("key is invalid (status %d), but failed to read error body: %w", resp.StatusCode, err)
+	}
+
+	// Use the new parser to extract a clean error message.
+	parsedError := app_errors.ParseUpstreamError(errorBody)
+
+	return false, fmt.Errorf("[status %d] %s", resp.StatusCode, parsedError)
 }
 
 // IsStreamingRequest checks if the request is for a streaming response.