115 lines
2.2 KiB
Go
115 lines
2.2 KiB
Go
package main
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import (
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"encoding/json"
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"log"
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"net/http"
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"strconv"
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"golang.org/x/net/html"
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)
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const PUN_BASE = "http://www.punoftheday.com"
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const RANDOM_PUN = PUN_BASE + "/cgi-bin/randompun.pl"
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const SELECT_PUN = PUN_BASE + "/pun"
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type Pun struct {
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Id int `json:"-"`
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Url string `json:"url"`
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Text string `json:"text"`
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}
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type Error struct {
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Status int `json:"-"`
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Detail string `json:"error"`
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}
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func main() {
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http.HandleFunc("/puns/random", RandomPun)
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http.HandleFunc("/puns/", ShowPun)
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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 NotFound(w http.ResponseWriter, r *http.Request) {
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log.Printf("404 Not Found: %v\n", r.URL.Path)
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w.Header().Set("Content-Type", "application/json; charset=utf-8")
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err := &Error{404, "not_found"}
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w.WriteHeader(err.Status)
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json.NewEncoder(w).Encode(err)
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}
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func WritePun(w http.ResponseWriter, r *http.Request, pun Pun) {
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log.Printf("200 OK: %v\n", r.URL.Path)
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w.Header().Set("Content-Type", "application/json; charset=utf-8")
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json.NewEncoder(w).Encode(pun)
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}
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func ShowPun(w http.ResponseWriter, r *http.Request) {
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id := r.URL.Path[len("/puns/"):]
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pun := getPun(SELECT_PUN + "/" + id)
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if id != strconv.Itoa(pun.Id) {
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NotFound(w, r)
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} else {
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WritePun(w, r, pun)
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}
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}
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func RandomPun(w http.ResponseWriter, r *http.Request) {
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pun := getPun(RANDOM_PUN)
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WritePun(w, r, pun)
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}
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func getPun(url string) Pun {
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resp, err := http.Get(url)
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if err != nil {
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log.Println("ERROR: Unable to access " + url)
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}
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b := resp.Body
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defer b.Close()
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pun := Pun{}
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z := html.NewTokenizer(b)
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for {
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tt := z.Next()
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switch {
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case tt == html.ErrorToken:
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return pun
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case tt == html.StartTagToken:
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t := z.Token()
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isParagraph := t.Data == "p"
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isInput := t.Data == "input"
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if isParagraph && pun.Text == "" {
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z.Next()
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t := z.Token()
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pun.Text = t.Data
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}
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if isInput {
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if getAttr("name", t) == "PunID" {
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pun.Id, _ = strconv.Atoi(getAttr("value", t))
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pun.Url = SELECT_PUN + "/" + strconv.Itoa(pun.Id)
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}
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}
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}
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}
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}
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func getAttr(at string, t html.Token) string {
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var val string
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for _, a := range t.Attr {
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if a.Key == at {
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val = a.Val
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}
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}
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return val
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}
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