package main
import (
"bufio"
"encoding/json"
"fmt"
"io"
"net/http"
"os"
"path/filepath"
"strings"
)
// anchoredSearch looks for needle in r,
// skipping the first skip space-delimited words
func anchoredSearch(r io.Reader, needle string, skip int) bool {
scanner := bufio.NewScanner(r)
for scanner.Scan() {
line := scanner.Text()
parts := strings.SplitN(line, " ", skip+1)
if (len(parts) > skip) && (parts[skip] == needle) {
return true
}
}
return false
}
// anchoredSearchFile performs an anchoredSearch on a given filename
func anchoredSearchFile(filename string, needle string, skip int) bool {
r, err := os.Open(filename)
if err != nil {
return false
}
defer r.Close()
return anchoredSearch(r, needle, skip)
}
type Status int
const (
Success = iota
Fail
Error
)
// ShowJSend renders a JSend response to w
func ShowJSend(w http.ResponseWriter, status Status, short string, description string) {
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(http.StatusOK) // RFC2616 makes it pretty clear that 4xx codes are for the user-agent
statusStr := ""
switch status {
case Success:
statusStr = "success"
case Fail:
statusStr = "fail"
default:
statusStr = "error"
}
jshort, _ := json.Marshal(short)
jdesc, _ := json.Marshal(description)
fmt.Fprintf(
w,
`{"status":"%s","data":{"short":%s,"description":%s}}"`,
statusStr, jshort, jdesc,
)
}
// ShowHtml delevers an HTML response to w
func ShowHtml(w http.ResponseWriter, status Status, title string, body string) {
w.Header().Set("Content-Type", "text/html; charset=utf-8")
w.WriteHeader(http.StatusOK)
statusStr := ""
switch status {
case Success:
statusStr = "Success"
case Fail:
statusStr = "Fail"
default:
statusStr = "Error"
}
fmt.Fprintf(w, "")
fmt.Fprintf(w, "")
fmt.Fprintf(w, "%s", title)
fmt.Fprintf(w, "")
fmt.Fprintf(w, "")
fmt.Fprintf(w, "")
fmt.Fprintf(w, "")
fmt.Fprintf(w, "%s
", statusStr, title)
fmt.Fprintf(w, "", body)
fmt.Fprintf(w, "")
fmt.Fprintf(w, "")
}
// staticStylesheet serves up a basic stylesheet.
// This is designed to be usable on small touchscreens (like mobile phones)
func staticStylesheet(w http.ResponseWriter) {
w.Header().Set("Content-Type", "text/css")
w.WriteHeader(http.StatusOK)
fmt.Fprint(
w,
`
/* http://paletton.com/#uid=63T0u0k7O9o3ouT6LjHih7ltq4c */
body {
font-family: sans-serif;
max-width: 40em;
background: #282a33;
color: #f6efdc;
}
a:any-link {
color: #8b969a;
}
h1 {
background: #5e576b;
color: #9e98a8;
}
h1.Fail, h1.Error {
background: #3a3119;
color: #ffcc98;
}
h1.Fail:before {
content: "Fail: ";
}
h1.Error:before {
content: "Error: ";
}
p {
margin: 1em 0em;
}
form, pre {
margin: 1em;
}
input {
padding: 0.6em;
margin: 0.2em;
}
li {
margin: 0.5em 0em;
}
`,
)
}
// staticIndex serves up a basic landing page
func staticIndex(w http.ResponseWriter) {
ShowHtml(
w, Success,
"Welcome",
`
Register your team
If someone on your team has already registered,
proceed to the
puzzles overview.
`,
)
}
func staticScoreboard(w http.ResponseWriter) {
ShowHtml(
w, Success,
"Scoreboard",
"XXX: This would be the scoreboard",
)
}
func staticPuzzles(w http.ResponseWriter) {
ShowHtml(
w, Success,
"Puzzles",
"XXX: This would be the puzzles overview",
)
}
func tryServeFile(w http.ResponseWriter, req *http.Request, path string) bool {
f, err := os.Open(path)
if err != nil {
return false
}
defer f.Close()
d, err := f.Stat()
if err != nil {
return false
}
http.ServeContent(w, req, path, d.ModTime(), f)
return true
}
func ServeStatic(w http.ResponseWriter, req *http.Request, resourcesDir string) {
path := req.URL.Path
if strings.Contains(path, "..") {
http.Error(w, "Invalid URL path", http.StatusBadRequest)
return
}
if path == "/" {
path = "/index.html"
}
fpath := filepath.Join(resourcesDir, path)
if tryServeFile(w, req, fpath) {
return
}
switch path {
case "/basic.css":
staticStylesheet(w)
case "/index.html":
staticIndex(w)
case "/scoreboard.html":
staticScoreboard(w)
case "/puzzles.html":
staticPuzzles(w)
default:
http.NotFound(w, req)
}
}