feat(sync): full code sync from release

backend/internal/service/openai_client_transport.go

@@ -0,0 +1,71 @@
+package service
+
+import (
+	"strings"
+
+	"github.com/gin-gonic/gin"
+)
+
+// OpenAIClientTransport 表示客户端入站协议类型。
+type OpenAIClientTransport string
+
+const (
+	OpenAIClientTransportUnknown OpenAIClientTransport = ""
+	OpenAIClientTransportHTTP    OpenAIClientTransport = "http"
+	OpenAIClientTransportWS      OpenAIClientTransport = "ws"
+)
+
+const openAIClientTransportContextKey = "openai_client_transport"
+
+// SetOpenAIClientTransport 标记当前请求的客户端入站协议。
+func SetOpenAIClientTransport(c *gin.Context, transport OpenAIClientTransport) {
+	if c == nil {
+		return
+	}
+	normalized := normalizeOpenAIClientTransport(transport)
+	if normalized == OpenAIClientTransportUnknown {
+		return
+	}
+	c.Set(openAIClientTransportContextKey, string(normalized))
+}
+
+// GetOpenAIClientTransport 读取当前请求的客户端入站协议。
+func GetOpenAIClientTransport(c *gin.Context) OpenAIClientTransport {
+	if c == nil {
+		return OpenAIClientTransportUnknown
+	}
+	raw, ok := c.Get(openAIClientTransportContextKey)
+	if !ok || raw == nil {
+		return OpenAIClientTransportUnknown
+	}
+
+	switch v := raw.(type) {
+	case OpenAIClientTransport:
+		return normalizeOpenAIClientTransport(v)
+	case string:
+		return normalizeOpenAIClientTransport(OpenAIClientTransport(v))
+	default:
+		return OpenAIClientTransportUnknown
+	}
+}
+
+func normalizeOpenAIClientTransport(transport OpenAIClientTransport) OpenAIClientTransport {
+	switch strings.ToLower(strings.TrimSpace(string(transport))) {
+	case string(OpenAIClientTransportHTTP), "http_sse", "sse":
+		return OpenAIClientTransportHTTP
+	case string(OpenAIClientTransportWS), "websocket":
+		return OpenAIClientTransportWS
+	default:
+		return OpenAIClientTransportUnknown
+	}
+}
+
+func resolveOpenAIWSDecisionByClientTransport(
+	decision OpenAIWSProtocolDecision,
+	clientTransport OpenAIClientTransport,
+) OpenAIWSProtocolDecision {
+	if clientTransport == OpenAIClientTransportHTTP {
+		return openAIWSHTTPDecision("client_protocol_http")
+	}
+	return decision
+}