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137 lines
4.3 KiB
Go
137 lines
4.3 KiB
Go
package httpLayer
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import (
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"net/http"
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"strconv"
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"strings"
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"time"
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)
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const (
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//符合 nginx返回的时间格式，且符合 golang对时间格式字符串的 "123456"的约定 的字符串。
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Nginx_timeFormatStr = "02 Jan 2006 15:04:05 MST"
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Nginx400_html = "<html>\r\n<head><title>400 Bad Request</title></head>\r\n<body>\r\n<center><h1>400 Bad Request</h1></center>\r\n<hr><center>nginx/1.21.5</center>\r\n</body>\r\n</html>\r\n"
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// real nginx response,to generate it, echo xx | nc 127.0.0.1 80 > response
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Err400response_nginx = "HTTP/1.1 400 Bad Request\r\nServer: nginx/1.21.5\r\nDate: Sat, 02 Jan 2006 15:04:05 MST\r\nContent-Type: text/html\r\nConnection: close\r\n\r\n" + Nginx400_html
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// real nginx response,to generate it, curl -iv --raw 127.0.0.1/not_exist_path > response
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Err404response_nginx = "HTTP/1.1 404 Not Found\r\nServer: nginx/1.21.5\r\nDate: Sat, 02 Jan 2006 15:04:05 MST\r\nContent-Type: text/plain; charset=utf-8\r\nContent-Length: 19\r\nConnection: keep-alive\r\nCache-Control: no-cache, no-store, no-transform, must-revalidate, private, max-age=0\r\nExpires: Thu, 01 Jan 1970 08:00:00 AWST\r\nPragma: no-cache\r\nVary: Origin\r\nX-Content-Type-Options: nosniff\r\n\r\n404 page not found\n"
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//nginx应该是可以专门配置一个404页面的，所以没有该页面时，就会返回 404 page not found
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Nginx403_html = "<html>\r\n<head><title>403 Forbidden</title></head>\r\n<body bgcolor=\"white\">\r\n<center><h1>403 Forbidden</h1></center>\r\n<hr><center>nginx/1.21.5</center>\r\n</body>\r\n</html>\r\n"
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/* real nginx response, to generate it, set nginx config like:
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location / {
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return 403;
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}
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*/
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Err403response_nginx = "HTTP/1.1 403 Forbidden\r\nServer: nginx/1.21.5\r\nDate: Sat, 02 Jan 2006 15:04:05 MST\r\nContent-Type: text/html\r\nContent-Length: 169\r\nConnection: keep-alive\r\n\r\n" + Nginx403_html
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//备注
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// 1. vim中， "\r" 显示为 ^M, 输入它是用 ctrl + V + M
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// 2. vim 在显示 末尾 有 \n 的文件 时， 会 直接省略这个 \n
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)
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var (
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nginxTimezone = time.FixedZone("GMT", 0)
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bs_Nginx403_html = []byte(Nginx403_html)
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bs_Nginx400_html = []byte(Nginx400_html)
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)
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//Get real a 400 response that looks like it comes from nginx.
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func GetNginx400Response() string {
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return GetNginxResponse(Err400response_nginx)
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}
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//Get real a 403 response that looks like it comes from nginx.
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func GetNginx403Response() string {
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return GetNginxResponse(Err403response_nginx)
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}
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//Get real a 404 response that looks like it comes from nginx.
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func GetNginx404Response() string {
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return GetNginxResponse(Err404response_nginx)
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}
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func GetNginxWeekdayStr(t *time.Time) string {
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return t.Weekday().String()[:3]
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}
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func SetDefaultNginxHeader(rw http.ResponseWriter) {
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rw.Header().Add("Server", "nginx/1.21.5")
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t := time.Now().UTC().In(nginxTimezone)
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tStr := t.Format(Nginx_timeFormatStr)
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tStr = GetNginxWeekdayStr(&t) + ", " + tStr
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rw.Header().Add("Date", tStr)
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}
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//Get real a response that looks like it comes from nginx.
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func GetNginxResponse(template string) string {
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t := time.Now().UTC().In(nginxTimezone)
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tStr := t.Format(Nginx_timeFormatStr)
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str := strings.Replace(template, Nginx_timeFormatStr, tStr, 1)
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str = strings.Replace(str, "Sat", GetNginxWeekdayStr(&t), 1)
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return str
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}
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//mimic GetNginx400Response()
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func SetNginx400Response(rw http.ResponseWriter) {
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SetDefaultNginxHeader(rw)
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rw.Header().Add("Content-Type", "text/html")
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rw.Header().Add("Connection", "close")
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//真实nginx 400响应里不含 Content-Length
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// 情况是这样的： 若 Connection 是 keep-alive, 则 有 Content-Length；
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// 若 Connection 是 Close，则 没有 Content-Length；
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rw.WriteHeader(http.StatusBadRequest)
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rw.Write(bs_Nginx400_html)
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if flusher, ok := rw.(http.Flusher); ok {
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flusher.Flush()
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}
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}
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func SetNginx403Response(rw http.ResponseWriter) {
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SetDefaultNginxHeader(rw)
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rw.Header().Add("Content-Type", "text/html")
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rw.Header().Add("Connection", "keep-alive")
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rw.Header().Add("Content-Length", strconv.Itoa(len(bs_Nginx403_html)))
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rw.WriteHeader(http.StatusForbidden)
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rw.Write(bs_Nginx403_html)
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if flusher, ok := rw.(http.Flusher); ok {
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flusher.Flush()
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}
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}
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//implements netLayer.RejectConn
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type RejectConn struct {
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http.ResponseWriter
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}
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func (RejectConn) RejectBehaviorDefined() bool {
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return true
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}
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//call SetNginx403Response
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func (rc RejectConn) Reject() {
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SetNginx403Response(rc.ResponseWriter)
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}
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