43 lines
3.3 KiB
Go
43 lines
3.3 KiB
Go
package core
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import (
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"fmt"
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"github.com/gin-gonic/gin"
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"net/http"
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"strings"
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)
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// Cors 跨域中间件
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func Cors() gin.HandlerFunc {
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return func(c *gin.Context) {
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method := c.Request.Method // 请求方法
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origin := c.Request.Header.Get("Origin") // 请求头部
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var headerKeys []string // 声明请求头keys
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for k, _ := range c.Request.Header {
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headerKeys = append(headerKeys, k)
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}
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headerStr := strings.Join(headerKeys, ", ")
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if headerStr != "" {
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headerStr = fmt.Sprintf("access-control-allow-origin, access-control-allow-headers, %s", headerStr)
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} else {
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headerStr = "access-control-allow-origin, access-control-allow-headers"
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}
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if origin != "" {
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c.Writer.Header().Set("Access-Control-Allow-Origin", "*")
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c.Header("Access-Control-Allow-Origin", "*") // 允许访问所有域
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c.Header("Access-Control-Allow-Methods", "POST, GET, OPTIONS, PUT, DELETE, UPDATE") // 服务器支持的所有跨域请求的方法
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c.Header("Access-Control-Allow-Headers", "Authorization, Content-Length, X-CSRF-Token, Token, session, X_Requested_With, Accept, Origin, Host, Connection, Accept-Encoding, Accept-Language, DNT, X-CustomHeader, Keep-Alive, User-Agent, X-Requested-With, If-Modified-Since, Cache-Control, Content-Type, Pragma") // 允许的头类型
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c.Header("Access-Control-Expose-Headers", "Content-Length, Access-Control-Allow-Origin, Access-Control-Allow-Headers, Cache-Control, Content-Language, Content-Type, Expires, Last-Modified, Pragma, FooBar") // 允许跨域设置，可以返回其他子段
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c.Header("Access-Control-Max-Age", "172800") // 缓存请求信息，单位为秒
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c.Header("Access-Control-Allow-Credentials", "false") // 跨域请求是否需要带cookie信息，默认设置为true
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c.Set("content-type", "application/json;charset=utf8") // 设置返回格式是json
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}
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// 放行所有OPTIONS方法
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if method == "OPTIONS" {
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c.JSON(http.StatusOK, "Options Request!")
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}
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// 处理请求
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c.Next()
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}
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}
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