sun
155fab6b4b
- add DebugLog global variable controlled by BYTEDANCE_TTS_DEBUG env - enable debug logs for cors, tts upstream, response parsing etc when debug mode is on - update tts error response to use standardized json error format - add dashboard and metrics path to cache-control exempt list
102 lines
2.8 KiB
Go
102 lines
2.8 KiB
Go
package middleware
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import (
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"log"
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"net/http"
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"strings"
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"github.com/volcano-tts/tts-api/common"
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"github.com/volcano-tts/tts-api/setting"
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)
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var (
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corsMaxAgeHeader = "86400"
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)
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// InitCORSConfig 已在 setting.InitCORSConfig 中完成,这里保留为 no-op 以维持现有调用顺序。
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// 实际 CORS 匹配逻辑直接读 setting.CORS.Origins / setting.CORS.AllowAll。
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func InitCORSConfig() {
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// 配置由 setting 包统一加载,日志也由 setting.LogStartupSummary 输出。
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_ = setting.CORS
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}
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func isValidOrigin(origin string) bool {
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if origin == "" || origin == "null" || origin == "nil" {
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return false
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}
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lowerOrigin := strings.ToLower(origin)
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if !strings.HasPrefix(lowerOrigin, "http://") && !strings.HasPrefix(lowerOrigin, "https://") {
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return false
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}
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return true
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}
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func matchOrigin(origin string) (string, bool) {
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if !isValidOrigin(origin) {
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return "", false
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}
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if setting.CORS.AllowAll {
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return "*", true
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}
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normalized := strings.ToLower(strings.TrimRight(strings.TrimSpace(origin), "/"))
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for _, allowed := range setting.CORS.Origins {
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if allowed == normalized {
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return origin, true
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}
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}
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return "", false
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}
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func CORS(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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origin := r.Header.Get("Origin")
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// 无 Origin 头:非跨域请求,跳过 CORS 处理
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if origin == "" {
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next.ServeHTTP(w, r)
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return
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}
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// 有 Origin 头时,响应必须携带 Vary: Origin 防止 CDN 缓存污染
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vary := w.Header().Get("Vary")
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if vary == "" {
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w.Header().Set("Vary", "Origin")
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} else if !strings.Contains(vary, "Origin") {
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w.Header().Set("Vary", vary+", Origin")
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}
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isPreflight := r.Method == http.MethodOptions
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allowOrigin, matched := matchOrigin(origin)
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if !matched {
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// Origin 不在白名单:拒绝请求(预检和非预检均拒绝),
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// 防止不匹配的请求穿透到后端浪费 TTS 资源
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if common.DebugLog {
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log.Printf("CORS拦截: 来源=%q 路径=%s 方法=%s 客户端=%s",
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origin, r.URL.Path, r.Method, GetClientIP(r))
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}
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w.WriteHeader(http.StatusForbidden)
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return
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}
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// Origin 匹配:设置 CORS 响应头
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w.Header().Set("Access-Control-Allow-Origin", allowOrigin)
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w.Header().Set("Access-Control-Allow-Methods", "GET, POST, OPTIONS")
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w.Header().Set("Access-Control-Allow-Headers", "Content-Type, Authorization")
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w.Header().Set("Access-Control-Expose-Headers", "X-Request-Id")
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w.Header().Set("Access-Control-Max-Age", corsMaxAgeHeader)
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if allowOrigin != "*" {
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w.Header().Set("Access-Control-Allow-Credentials", "true")
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}
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// 预检请求:直接返回 204,不进入内层中间件链,
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// 避免消耗速率限制配额和并发槽位
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if isPreflight {
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w.WriteHeader(http.StatusNoContent)
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return
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}
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next.ServeHTTP(w, r)
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})
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}
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