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package main
import (
"bytes"
"embed"
"encoding/json"
"html/template"
"log/slog"
"net"
"net/http"
"net/url"
"os"
"path"
"strings"
"sync"
"github.com/BurntSushi/toml"
)
//go:embed countries.toml
var countriesTOML []byte
func main() {
log := slog.New(slog.NewTextHandler(os.Stderr, nil))
socketPath := os.Getenv("SOCKET_PATH")
if socketPath == "" {
log.Error("SOCKET_PATH must be set")
os.Exit(1)
}
domain := os.Getenv("DOMAIN")
if domain == "" {
log.Error("DOMAIN environment variable must be set")
os.Exit(1)
}
lawsDir := os.Getenv("LAWS_DIR")
if lawsDir == "" {
log.Error("LAWS_DIR must be set")
os.Exit(1)
}
var handler = handler{logger: log, domain: domain, lawsDir: lawsDir, lawsByCC: map[string]map[string]law{}}
meta, err := toml.NewDecoder(bytes.NewReader(countriesTOML)).Decode(&handler.countries)
if err != nil {
log.Error("failed to parse countries.toml", Error(err))
os.Exit(1)
}
if len(meta.Undecoded()) != 0 {
log.Error("unknown keys in countries.toml", "keys", meta.Undecoded())
os.Exit(1)
}
lawFiles, err := os.ReadDir(lawsDir)
if err == nil {
for _, file := range lawFiles {
cc := strings.SplitN(file.Name(), ".", 2)[0]
handler.loadLaws(cc)
}
} else if !os.IsNotExist(err) {
log.Error("failed to read laws directory", Error(err), "path", lawsDir)
os.Exit(1)
}
http.HandleFunc("/", handler.handle)
listener, err := net.Listen("unix", socketPath)
if err != nil {
log.Error("failed to listen", Error(err))
os.Exit(1)
}
if err := os.Chmod(socketPath, 0666); err != nil {
log.Error("failed to set socket permissions", Error(err), "path", socketPath)
return
}
err = http.Serve(listener, nil)
log.Error("failed to serve", Error(err))
}
//go:embed templates
var templates embed.FS
var tpl, _ = template.New("").Funcs(template.FuncMap{
"ToUpper": strings.ToUpper,
}).Option("missingkey=error").ParseFS(templates, "templates/*")
type handler struct {
logger *slog.Logger
domain string
countries map[string]country
lawsDir string
lawsByCC map[string]map[string]law
lawsMu sync.RWMutex
}
func (h *handler) handle(w http.ResponseWriter, r *http.Request) {
if r.Host == "internal.invalid" {
h.loadLaws(r.URL.Query().Get("country"))
return
}
if r.Host == h.domain {
if r.URL.Path != "/" {
w.WriteHeader(http.StatusNotFound)
w.Write([]byte("page not found"))
return
}
var html bytes.Buffer
err := tpl.ExecuteTemplate(&html, "index.html.tmpl", map[string]any{
"Countries": h.countries,
"Domain": r.Host,
})
if err != nil {
h.logger.Error("failed to execute index template", Error(err))
http.Error(w, "internal server error", http.StatusInternalServerError)
return
}
w.Write(html.Bytes())
return
}
cc, isSubdomain := strings.CutSuffix(r.Host, "."+h.domain)
if !isSubdomain {
h.logger.Error("request for unknown hosts", "host", r.Host)
w.Write([]byte("unknown host"))
return
}
key := strings.TrimLeft(r.URL.Path, "/")
if len(key) > 0 {
h.lawsMu.RLock()
defer h.lawsMu.RUnlock()
val, ok := h.lawsByCC[cc][key]
if !ok {
w.WriteHeader(http.StatusNotFound)
w.Write([]byte("unknown law"))
return
}
http.Redirect(w, r, val.URL, 302)
} else {
query := r.URL.Query().Get("q")
if query != "" {
country, ok := h.countries[cc]
if !ok {
w.WriteHeader(http.StatusNotFound)
w.Write([]byte("search not implemented for this country"))
return
}
if country.HasPlaceholder() {
http.Redirect(w, r, strings.Replace(country.SearchURL, "%s", url.QueryEscape(query), 1), 302)
return
} else {
w.WriteHeader(http.StatusBadRequest)
}
}
h.lawsMu.RLock()
defer h.lawsMu.RUnlock()
_, hasJSONLaws := h.lawsByCC[cc]
var html bytes.Buffer
err := tpl.ExecuteTemplate(&html, "search.html.tmpl", map[string]any{
"TLD": cc,
"Domain": h.domain,
"Country": h.countries[cc],
"HasJSONLaws": hasJSONLaws,
})
if err != nil {
h.logger.Error("failed to execute search template", Error(err))
http.Error(w, "internal server error", http.StatusInternalServerError)
return
}
w.Write(html.Bytes())
}
}
func (h *handler) loadLaws(country string) {
filePath := path.Join(h.lawsDir, country+".json")
text, err := os.ReadFile(filePath)
if err != nil {
h.logger.Error("failed to read file", Error(err), "path", filePath)
return
}
var laws []law
err = json.Unmarshal([]byte(text), &laws)
if err != nil {
h.logger.Error("failed to parse file", Error(err), "path", filePath)
return
}
h.lawsMu.Lock()
defer h.lawsMu.Unlock()
h.lawsByCC[country] = map[string]law{}
for _, law := range laws {
if law.Redir != "" {
h.lawsByCC[country][law.Redir] = law
}
}
}
type law struct {
URL string
Title string
Abbr string
Redir string
}
type country struct {
Name string
SearchURL string `toml:"search-url"`
}
func (c country) HasPlaceholder() bool {
return strings.Contains(c.SearchURL, "%s")
}
func Error(value error) slog.Attr { return slog.String("error", value.Error()) }
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