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package main
import (
"errors"
"net/http"
"strings"
)
const mimePlain = "text/plain; charset=utf-8"
const mimeJSON = "application/json; charset=utf-8"
// Validates the request and then queries the cache for the response.
func mainHandler(w http.ResponseWriter, r *http.Request) {
if !methodHop(r) {
errHTTP(w, r, errors.New("405 Method Not Allowed"), http.StatusMethodNotAllowed)
return
}
format := formatHop(r)
if format != "plain" && format != "json" && r.URL.Path != "/" {
errHTTP(w, r, errors.New("400 Bad Request"), http.StatusBadRequest)
return
}
err := cache.bap(r.URL.Path)
if err != nil {
errHTTP(w, r, err, http.StatusInternalServerError)
return
}
if format == "json" {
w.Header().Set("Content-Type", mimeJSON)
} else {
w.Header().Set("Content-Type", mimePlain)
}
out, expires := cache.yoink(r.URL.Path)
w.Header().Set("Expires", expires)
_, err = w.Write(out)
if err != nil {
errHTTP(w, r, err, http.StatusBadRequest)
return
}
log200(r)
}
// Simple HTTP method check
func methodHop(r *http.Request) bool {
return r.Method == http.MethodGet || r.Method == http.MethodHead
}
// Yoinks the response format
func formatHop(r *http.Request) string {
if r.URL.Path == "/" {
return ""
}
split := strings.Split(r.URL.Path[1:], "/")
return split[0]
}
// Yoinks the endpoint
func routingHop(r *http.Request) string {
split := strings.Split(r.URL.Path[1:], "/")
return split[1]
}
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