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43 lines
904 B
43 lines
904 B
package main
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import (
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"errors"
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"fmt"
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"log"
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"net/http"
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"regexp"
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)
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func main() {
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http.HandleFunc("/hello", helloHTTP)
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http.HandleFunc("/user/", userProfile)
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http.HandleFunc("/", notFound)
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log.Fatal(http.ListenAndServe(":8080", nil))
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}
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func helloHTTP(w http.ResponseWriter, req *http.Request) {
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fmt.Fprint(w, "Hello HTTP")
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}
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func notFound(w http.ResponseWriter, req *http.Request) {
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http.NotFound(w, req)
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}
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func userProfile(w http.ResponseWriter, req *http.Request) {
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userID, err := getID(w, req)
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if err != nil {
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return
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}
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fmt.Fprintf(w, "User Profile: %q", userID)
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}
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var validPath = regexp.MustCompile("^/(user)/([0-9]+)$")
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func getID(w http.ResponseWriter, req *http.Request) (string, error) {
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m := validPath.FindStringSubmatch(req.URL.Path)
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if m == nil {
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http.NotFound(w, req)
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return "", errors.New("Invalid ID")
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}
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return m[2], nil // The ID is the second subexpression.
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}
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