fix: 修正 conversion 代理路径和错误边界

backend/internal/conversion/engine.go

@@ -3,11 +3,13 @@ package conversion
 import (
 	"encoding/json"
 	"fmt"
+	"strings"
 	"time"
 
 	"github.com/google/uuid"
 	"go.uber.org/zap"
 
+	"nex/backend/internal/conversion/canonical"
 	pkglogger "nex/backend/pkg/logger"
 )
 
@@ -71,7 +73,7 @@ func (e *ConversionEngine) IsPassthrough(clientProtocol, providerProtocol string
 
 // ConvertHttpRequest 转换 HTTP 请求
 func (e *ConversionEngine) ConvertHttpRequest(spec HTTPRequestSpec, clientProtocol, providerProtocol string, provider *TargetProvider) (*HTTPRequestSpec, error) {
-	nativePath := spec.URL
+	nativePath, rawQuery := splitRequestPath(spec.URL)
 
 	if e.IsPassthrough(clientProtocol, providerProtocol) {
 		providerAdapter, err := e.registry.Get(providerProtocol)
@@ -96,8 +98,11 @@ func (e *ConversionEngine) ConvertHttpRequest(spec HTTPRequestSpec, clientProtoc
 			}
 		}
 
+		providerURL := providerAdapter.BuildUrl(nativePath, interfaceType)
+		providerURL = appendRawQuery(providerURL, rawQuery)
+
 		return &HTTPRequestSpec{
-			URL:     provider.BaseURL + nativePath,
+			URL:     joinBaseURL(provider.BaseURL, providerURL),
 			Method:  spec.Method,
 			Headers: providerAdapter.BuildHeaders(provider),
 			Body:    rewrittenBody,
@@ -115,6 +120,7 @@ func (e *ConversionEngine) ConvertHttpRequest(spec HTTPRequestSpec, clientProtoc
 
 	interfaceType := clientAdapter.DetectInterfaceType(nativePath)
 	providerURL := providerAdapter.BuildUrl(nativePath, interfaceType)
+	providerURL = appendRawQuery(providerURL, rawQuery)
 	providerHeaders := providerAdapter.BuildHeaders(provider)
 	providerBody, err := e.convertBody(interfaceType, clientAdapter, providerAdapter, provider, spec.Body)
 	if err != nil {
@@ -122,7 +128,7 @@ func (e *ConversionEngine) ConvertHttpRequest(spec HTTPRequestSpec, clientProtoc
 	}
 
 	return &HTTPRequestSpec{
-		URL:     provider.BaseURL + providerURL,
+		URL:     joinBaseURL(provider.BaseURL, providerURL),
 		Method:  spec.Method,
 		Headers: providerHeaders,
 		Body:    providerBody,
@@ -198,7 +204,7 @@ func (e *ConversionEngine) CreateStreamConverter(clientProtocol, providerProtoco
 
 	ctx := ConversionContext{
 		ConversionID:  uuid.New().String(),
-		InterfaceType: InterfaceTypeChat,
+		InterfaceType: interfaceType,
 		Timestamp:     time.Now(),
 	}
 
@@ -268,7 +274,7 @@ func (e *ConversionEngine) convertResponseBody(interfaceType InterfaceType, clie
 func (e *ConversionEngine) convertChatBody(clientAdapter, providerAdapter ProtocolAdapter, provider *TargetProvider, body []byte) ([]byte, error) {
 	canonicalReq, err := clientAdapter.DecodeRequest(body)
 	if err != nil {
-		return nil, NewConversionError(ErrorCodeJSONParseError, "解码请求失败").WithCause(err)
+		return nil, NewRequestJSONParseError("解码请求失败", err)
 	}
 
 	ctx := NewConversionContext(InterfaceTypeChat)
@@ -276,6 +282,9 @@ func (e *ConversionEngine) convertChatBody(clientAdapter, providerAdapter Protoc
 	if err != nil {
 		return nil, err
 	}
+	if containsUnsupportedMultimodal(canonicalReq) {
+		return nil, NewConversionError(ErrorCodeUnsupportedMultimodal, "跨协议暂不支持多模态内容")
+	}
 
 	encoded, err := providerAdapter.EncodeRequest(canonicalReq, provider)
 	if err != nil {
@@ -287,7 +296,7 @@ func (e *ConversionEngine) convertChatBody(clientAdapter, providerAdapter Protoc
 func (e *ConversionEngine) convertChatResponseBody(clientAdapter, providerAdapter ProtocolAdapter, body []byte, modelOverride string) ([]byte, error) {
 	canonicalResp, err := providerAdapter.DecodeResponse(body)
 	if err != nil {
-		return nil, NewConversionError(ErrorCodeJSONParseError, "解码响应失败").WithCause(err)
+		return nil, NewResponseJSONParseError("解码响应失败", err)
 	}
 	if modelOverride != "" {
 		canonicalResp.Model = modelOverride
@@ -375,6 +384,7 @@ func (e *ConversionEngine) DetectInterfaceType(nativePath, clientProtocol string
 	if err != nil {
 		return InterfaceTypePassthrough, err
 	}
+	nativePath, _ = splitRequestPath(nativePath)
 	return adapter.DetectInterfaceType(nativePath), nil
 }
 
@@ -398,3 +408,46 @@ func (e *ConversionEngine) EncodeError(err *ConversionError, clientProtocol stri
 	body, statusCode := adapter.EncodeError(err)
 	return body, statusCode, nil
 }
+
+func splitRequestPath(rawPath string) (string, string) {
+	path, query, found := strings.Cut(rawPath, "?")
+	if !found {
+		return rawPath, ""
+	}
+	return path, query
+}
+
+func appendRawQuery(path, rawQuery string) string {
+	if rawQuery == "" {
+		return path
+	}
+	if strings.Contains(path, "?") {
+		return path + "&" + rawQuery
+	}
+	return path + "?" + rawQuery
+}
+
+func joinBaseURL(baseURL, path string) string {
+	if baseURL == "" {
+		return path
+	}
+	if path == "" {
+		return baseURL
+	}
+	return strings.TrimRight(baseURL, "/") + "/" + strings.TrimLeft(path, "/")
+}
+
+func containsUnsupportedMultimodal(req *canonical.CanonicalRequest) bool {
+	if req == nil {
+		return false
+	}
+	for _, msg := range req.Messages {
+		for _, block := range msg.Content {
+			switch block.Type {
+			case "image", "audio", "video", "file":
+				return true
+			}
+		}
+	}
+	return false
+}