Go: 将用户名添加到URL中

huangapple
go评论104阅读模式
英文:

Go: add username to URL

问题

如何将当前用户的用户名或其他变量添加到Go中URL路径的末尾？

我尝试使用http.Redirect(w, "/home/"+user, http.StatusFound)，但这会创建一个无限重定向循环。

Go代码：

  1. func homeHandler(w http.ResponseWriter, r *http.Request) {
  2.     randIndex := rand.Intn(len(cityLibrary))
  3.     ImageDisplay()
  4.     WeatherDisplay()
  5.     dispdata := AllApiData{
  6.         Images: imagesArray,
  7.         Weather: &WeatherData{
  8.             Temp:      celsiusNum,
  9.             City:      cityLibrary[randIndex],
  10.             RainShine: rainOrShine,
  11.         },
  12.     }
  14.     // http.Redirect(w, "/"+cityLibrary[randIndex], http.StatusFound) --> 无限重定向循环
  16.     renderTemplate(w, "home", dispdata)
  17. }
  19. func main() {
  20.     http.HandleFunc("/", homeHandler)
  22.     http.Handle("/layout/", http.StripPrefix("/layout/", http.FileServer(http.Dir("layout"))))
  24.     http.ListenAndServe(":8000", nil)
  25. }

在这段代码中，我尝试将"City"的值附加到根URL的末尾。我应该使用正则表达式吗？

英文:

How do I add the username of the current user, or other variables, to the end of the URL path in Go?

I tried using a http.Redirect(w, "/home/"+user, http.StatusFound), but that would create an infinite redirect loop.

Go:

  1. func homeHandler(w http.ResponseWriter, r *http.Request) {
  2.     randIndex = rand.Intn(len(cityLibrary))
  3.     ImageDisplay()
  4.     WeatherDisplay()
  5.     dispdata = AllApiData{Images: imagesArray, Weather: &WeatherData{Temp: celsiusNum, City: cityLibrary[randIndex], RainShine: rainOrShine}}
  7.     //http.Redirect(w, "/"+cityLibrary[randIndex], http.StatusFound) --> infinite redirect loop
  9.     renderTemplate(w, "home", dispdata)
  10.     }
  12. func main() {
  13.     http.HandleFunc("/", homeHandler)
  15.     http.Handle("/layout/", http.StripPrefix("/layout/", http.FileServer(http.Dir("layout"))))
  17.     http.ListenAndServe(":8000", nil)
  18. }

In this code, I'm trying to append the value of "City" to the end of the root URL. Should I be using regexp?

答案1

得分: 3

似乎发生这种情况是因为你没有一个 /{city}/ 处理程序，而 / 处理程序正在匹配所有被重定向到城市的请求：

模式名称固定，根路径，如 "/favicon.ico"，或根子树，如 "/images/"（注意末尾的斜杠）。较长的模式优先于较短的模式，因此如果同时为 "/images/" 和 "/images/thumbnails/" 注册了处理程序，则后者将被调用以处理以 "/images/thumbnails/" 开头的路径，而前者将接收任何其他路径在 "/images/" 子树中的请求。

请注意，由于以斜杠结尾的模式命名了一个根子树，因此模式 "/ "匹配所有未被其他已注册模式匹配的路径，而不仅仅是路径为 "/ "的 URL。

你需要做的是放置城市 URL 处理程序，如果你需要处理正则表达式模式，请参考这个，或者你可以使用更强大的路由器，比如 gorilla 的 mux。

只使用 Go 而不使用 gorilla？我知道如何在 Gorilla 中做到这一点，但我只是想知道在 Go 中如何实现。

你可以按照之前提到的答案中所述，创建自己的自定义处理程序：

  1. type route struct {
  2.     pattern *regexp.Regexp
  3.     handler http.Handler
  4. }
  6. type RegexpHandler struct {
  7.     routes []*route
  8. }
  10. func (h *RegexpHandler) Handler(pattern *regexp.Regexp, handler http.Handler) {
  11.     h.routes = append(h.routes, &route{pattern, handler})
  12. }
  14. func (h *RegexpHandler) HandleFunc(pattern *regexp.Regexp, handler func(http.ResponseWriter, *http.Request)) {
  15.     h.routes = append(h.routes, &route{pattern, http.HandlerFunc(handler)})
  16. }
  18. func (h *RegexpHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
  19.     for _, route := range h.routes {
  20.         if route.pattern.MatchString(r.URL.Path) {
  21.             route.handler.ServeHTTP(w, r)
  22.             return
  23.         }
  24.     }
  25.     // no pattern matched; send 404 response
  26.     http.NotFound(w, r)
  27. }

然后你可以像这样使用它：

  1. import "regexp"
  3. ...
  5. rex := RegexpHandler{}
  6. rex.HandlerFunc(regexp.MustCompile("^/(\w+?)/?"), cityHandler) // cityHandler 是你的常规处理程序函数
  7. rex.HandlerFunc(regexp.MustCompile("^/"), homeHandler)
  8. http.Handle("/", &rex)
  9. http.ListenAndServe(":8000", nil)
英文:

It seems this is happening because you don't have a /{city}/ handler and the / handler is matching all the requests being redirected to cities :

> Patterns name fixed, rooted paths, like "/favicon.ico", or rooted subtrees, like "/images/" (note the trailing slash). Longer patterns take precedence over shorter ones, so that if there are handlers registered for both "/images/" and "/images/thumbnails/", the latter handler will be called for paths beginning "/images/thumbnails/" and the former will receive requests for any other paths in the "/images/" subtree.
>
> Note that since a pattern ending in a slash names a rooted subtree, the pattern "/" matches all paths not matched by other registered patterns, not just the URL with Path == "/".

What you need to do is put in the city url handler, if you need to handle RegEx patterns take a look at this or you could use a more powerful router like gorilla's mux.

> what just using Go without gorilla? I know how to do it in Gorilla but I'm just wondering how its done in Go.

You make your own custom handlers with as mentioned in the previously mentioned answer :
https://stackoverflow.com/a/6565407/220710

  1. type route struct {
  2.     pattern *regexp.Regexp
  3.     handler http.Handler
  4. }
  6. type RegexpHandler struct {
  7.     routes []*route
  8. }
  10. func (h *RegexpHandler) Handler(pattern *regexp.Regexp, handler http.Handler) {
  11.     h.routes = append(h.routes, &route{pattern, handler})
  12. }
  14. func (h *RegexpHandler) HandleFunc(pattern *regexp.Regexp, handler func(http.ResponseWriter, *http.Request)) {
  15.     h.routes = append(h.routes, &route{pattern, http.HandlerFunc(handler)})
  16. }
  18. func (h *RegexpHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
  19.     for _, route := range h.routes {
  20.         if route.pattern.MatchString(r.URL.Path) {
  21.             route.handler.ServeHTTP(w, r)
  22.             return
  23.         }
  24.     }
  25.     // no pattern matched; send 404 response
  26.     http.NotFound(w, r)
  27. }

To use this then you would do something like this :

  1. import regexp
  3. ...
  5. rex := RegexpHandler{}
  6. rex.HandlerFunc(regexp.MustCompile("^/(\w+?)/?"), cityHandler) // cityHandler is your regular handler function
  7. rex.HandlerFunc(regexp.MustCompile("^/"), homeHandler)
  8. http.Handle("/", &rex)
  9. http.ListenAndServe(":8000", nil)

huangapple
  • 本文由 发表于 2014年8月30日 15:58:28
  • 转载请务必保留本文链接：https://go.coder-hub.com/25580292.html
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