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package main
import (
"database/sql"
"embed"
_ "embed"
"flag"
"fmt"
"html/template"
"log/slog"
"net/http"
"os"
"strings"
_ "modernc.org/sqlite"
"tailscale.com/hostinfo"
"tailscale.com/tsnet"
"within.website/x/internal"
"within.website/x/web/openai/chatgpt"
"within.website/x/web/openai/moderation"
)
var (
dbLoc = flag.String("db-loc", "./data.db", "")
openAIModel = flag.String("openai-model", "gpt-3.5-turbo", "OpenAI model to use")
openAIToken = flag.String("openai-token", "", "OpenAI API token")
tsHostname = flag.String("ts-hostname", "apeirophobia", "hostname to use on the tailnet")
tsDir = flag.String("ts-dir", "", "directory to store Tailscale state")
//go:embed schema.sql
schema string
//go:embed static
staticFiles embed.FS
//go:embed tmpl/*.tmpl
templateFiles embed.FS
)
func main() {
internal.HandleStartup()
hostinfo.SetApp("within.website/x/cmd/apeirophobia")
slog.Debug("starting up", "hostname", *tsHostname)
http.Handle("/static/", http.FileServer(http.FS(staticFiles)))
srv := &tsnet.Server{
Hostname: *tsHostname,
Dir: *tsDir,
Logf: func(format string, vals ...any) {
slog.Debug(fmt.Sprintf(format, vals...), "group", "tsnet")
},
}
tmpls := template.Must(template.ParseFS(templateFiles, "tmpl/*.tmpl"))
db, err := sql.Open("sqlite", *dbLoc)
if err != nil {
slog.Error("error opening database", "err", err, "dbLoc", *dbLoc)
os.Exit(1)
}
defer db.Close()
if err := db.Ping(); err != nil {
slog.Error("error testing database", "err", err, "dbLoc", *dbLoc)
os.Exit(1)
}
if _, err := db.Exec(schema); err != nil {
slog.Error("error loading database schema", "err", err, "dbLoc", *dbLoc)
os.Exit(1)
}
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
if r.URL.Path != "/" {
w.WriteHeader(http.StatusNotFound)
tmpls.ExecuteTemplate(w, "404.tmpl", struct {
Title string
}{
Title: "Not found: " + r.URL.Path,
})
return
}
tmpls.ExecuteTemplate(w, "index.tmpl", struct {
Title string
}{
Title: "Apeirophobia",
})
})
if err := srv.Start(); err != nil {
slog.Error("error starting tsnet server", "err", err)
os.Exit(1)
}
defer srv.Close()
ln, err := srv.Listen("tcp", ":80")
if err != nil {
slog.Error("error listening over HTTP", "err", err)
os.Exit(1)
}
defer ln.Close()
slog.Info("listening", "hostname", *tsHostname)
if err := http.Serve(ln, nil); err != nil {
slog.Error("error running HTTP server", "err", err)
os.Exit(1)
}
}
type WikiHandler struct {
db *sql.DB
tmpls *template.Template
srv *tsnet.Server
chatGPT *chatgpt.Client
moderation *moderation.Client
}
func (wh WikiHandler) errorPage(err error, w http.ResponseWriter) {
w.WriteHeader(http.StatusInternalServerError)
wh.tmpls.ExecuteTemplate(w, "error.tmpl", struct {
Title string
Error string
}{
Title: "Internal Server Error",
Error: err.Error(),
})
}
func (wh WikiHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
article, found := strings.CutPrefix(r.URL.Path, "/wiki/")
if !found {
w.WriteHeader(http.StatusNotFound)
wh.tmpls.ExecuteTemplate(w, "404.tmpl", struct {
Title string
}{
Title: "Not found: " + r.URL.Path,
})
return
}
log := slog.Default().WithGroup("wikiHandler").With("article", article, "remote_ip", r.RemoteAddr)
prompt := userPrompt(article)
modResp, err := wh.moderation.Check(r.Context(), prompt)
if err != nil {
log.Error("can't check moderation API", "err", err)
wh.errorPage(err, w)
return
}
if modResp.Flagged() {
log.Error("filtered")
w.WriteHeader(http.StatusBadRequest)
wh.tmpls.ExecuteTemplate(w, "error.tmpl", struct {
Title string
Error string
}{
Title: "Filtered",
Error: modResp.Reasons(),
})
}
}
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