forked from lei.chen/myxce
58 lines
1.4 KiB
Go
58 lines
1.4 KiB
Go
package middleware
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import (
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"net/http"
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"strings"
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"github.com/gin-gonic/gin"
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)
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// CORSMiddleware returns a middleware that sets CORS headers.
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// allowedOrigins: list of allowed origins; pass nil to disable CORS entirely.
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// Pass []string{"*"} to allow all origins.
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func CORSMiddleware(allowedOrigins []string) gin.HandlerFunc {
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return func(c *gin.Context) {
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if len(allowedOrigins) == 0 {
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c.Next()
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return
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}
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origin := c.Request.Header.Get("Origin")
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allowed := ""
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for _, o := range allowedOrigins {
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if o == "*" || o == origin {
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allowed = o
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break
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}
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}
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if allowed != "" {
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c.Header("Access-Control-Allow-Origin", allowed)
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c.Header("Access-Control-Allow-Methods", "GET, POST, DELETE, OPTIONS")
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c.Header("Access-Control-Allow-Headers", "Origin, Content-Type, Authorization")
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c.Header("Access-Control-Max-Age", "86400")
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}
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if c.Request.Method == http.MethodOptions {
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c.AbortWithStatus(http.StatusNoContent)
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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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// CORSOriginsFromConfig builds the allowed origins list from a config string slice.
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// Returns nil if CORS is disabled (empty slice).
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func CORSOriginsFromConfig(enabled bool, origins []string) []string {
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if !enabled || len(origins) == 0 {
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return nil
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}
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result := make([]string, 0, len(origins))
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for _, o := range origins {
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if s := strings.TrimSpace(o); s != "" {
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result = append(result, s)
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}
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}
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return result
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}
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