117 lines
3.2 KiB
Go
117 lines
3.2 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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"sync"
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"github.com/Wei-Shaw/sub2api/internal/config"
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"github.com/gin-gonic/gin"
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)
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var corsWarningOnce sync.Once
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// CORS 跨域中间件
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func CORS(cfg config.CORSConfig) gin.HandlerFunc {
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allowedOrigins := normalizeOrigins(cfg.AllowedOrigins)
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allowAll := false
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for _, origin := range allowedOrigins {
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if origin == "*" {
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allowAll = true
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break
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}
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}
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wildcardWithSpecific := allowAll && len(allowedOrigins) > 1
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if wildcardWithSpecific {
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allowedOrigins = []string{"*"}
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}
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allowCredentials := cfg.AllowCredentials
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corsWarningOnce.Do(func() {
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if len(allowedOrigins) == 0 {
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log.Println("Warning: CORS allowed_origins not configured; cross-origin requests will be rejected.")
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}
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if wildcardWithSpecific {
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log.Println("Warning: CORS allowed_origins includes '*'; wildcard will take precedence over explicit origins.")
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}
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if allowAll && allowCredentials {
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log.Println("Warning: CORS allowed_origins set to '*', disabling allow_credentials.")
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}
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})
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if allowAll && allowCredentials {
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allowCredentials = false
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}
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allowedSet := make(map[string]struct{}, len(allowedOrigins))
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for _, origin := range allowedOrigins {
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if origin == "" || origin == "*" {
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continue
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}
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allowedSet[origin] = struct{}{}
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}
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allowHeaders := []string{
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"Content-Type", "Content-Length", "Accept-Encoding", "X-CSRF-Token", "Authorization",
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"accept", "origin", "Cache-Control", "X-Requested-With", "X-API-Key",
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}
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// OpenAI Node SDK 会发送 x-stainless-* 请求头，需在 CORS 中显式放行。
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openAIProperties := []string{
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"lang", "package-version", "os", "arch", "retry-count", "runtime",
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"runtime-version", "async", "helper-method", "poll-helper", "custom-poll-interval", "timeout",
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}
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for _, prop := range openAIProperties {
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allowHeaders = append(allowHeaders, "x-stainless-"+prop)
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}
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allowHeadersValue := strings.Join(allowHeaders, ", ")
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return func(c *gin.Context) {
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origin := strings.TrimSpace(c.GetHeader("Origin"))
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originAllowed := allowAll
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if origin != "" && !allowAll {
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_, originAllowed = allowedSet[origin]
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}
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if originAllowed {
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if allowAll {
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c.Writer.Header().Set("Access-Control-Allow-Origin", "*")
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} else if origin != "" {
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c.Writer.Header().Set("Access-Control-Allow-Origin", origin)
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c.Writer.Header().Add("Vary", "Origin")
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}
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if allowCredentials {
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c.Writer.Header().Set("Access-Control-Allow-Credentials", "true")
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}
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c.Writer.Header().Set("Access-Control-Allow-Headers", allowHeadersValue)
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c.Writer.Header().Set("Access-Control-Allow-Methods", "POST, OPTIONS, GET, PUT, DELETE, PATCH")
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c.Writer.Header().Set("Access-Control-Expose-Headers", "ETag")
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c.Writer.Header().Set("Access-Control-Max-Age", "86400")
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}
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// 处理预检请求
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if c.Request.Method == http.MethodOptions {
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if originAllowed {
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c.AbortWithStatus(http.StatusNoContent)
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} else {
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c.AbortWithStatus(http.StatusForbidden)
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}
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return
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}
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c.Next()
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}
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}
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func normalizeOrigins(values []string) []string {
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if len(values) == 0 {
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return nil
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}
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normalized := make([]string, 0, len(values))
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for _, value := range values {
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trimmed := strings.TrimSpace(value)
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if trimmed == "" {
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continue
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}
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normalized = append(normalized, trimmed)
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}
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return normalized
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}
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