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package main
import (
"encoding/base64"
"encoding/json"
"expvar"
"flag"
"log"
"log/slog"
"net/http"
"os"
"path/filepath"
"github.com/facebookgo/flagenv"
_ "github.com/joho/godotenv/autoload"
"golang.org/x/oauth2"
"gopkg.in/mxpv/patreon-go.v1"
"tailscale.com/client/tailscale"
"tailscale.com/hostinfo"
"tailscale.com/metrics"
"tailscale.com/tsnet"
"tailscale.com/tsweb"
"xeiaso.net/v4/internal"
)
var (
clientID = flag.String("client-id", "", "Patreon client ID")
clientSecret = flag.String("client-secret", "", "Patreon client secret")
dataDir = flag.String("data-dir", "./var", "Directory to store data in")
tailscaleHostname = flag.String("tailscale-hostname", "patreon-saasproxy", "Tailscale hostname to use")
tokenFetches = metrics.LabelMap{Label: "host"}
)
func main() {
flagenv.Parse()
flag.Parse()
internal.Slog()
hostinfo.SetApp("xeiaso.net/v4/cmd/patreon-saasproxy")
expvar.Publish("gauge_xesite_patreon_token_fetch", &tokenFetches)
os.MkdirAll(*dataDir, 0700)
os.MkdirAll(filepath.Join(*dataDir, "tsnet"), 0700)
srv := &tsnet.Server{
Hostname: *tailscaleHostname,
Dir: filepath.Join(*dataDir, "tsnet"),
Logf: func(string, ...any) {},
}
defer srv.Close()
lc, err := srv.LocalClient()
if err != nil {
log.Fatal(err)
}
config := oauth2.Config{
ClientID: *clientID,
ClientSecret: *clientSecret,
Endpoint: oauth2.Endpoint{
AuthURL: patreon.AuthorizationURL,
TokenURL: patreon.AccessTokenURL,
},
Scopes: []string{"users", "pledges-to-me", "my-campaign"},
}
if !internal.FileExists(filepath.Join(*dataDir, "patreon-token.json")) {
val, ok := os.LookupEnv("PATREON_TOKEN_JSON_B64")
if !ok {
log.Fatal("PATREON_TOKEN_JSON_B64 not set")
}
fout, err := os.Create(filepath.Join(*dataDir, "patreon-token.json"))
if err != nil {
log.Fatal(err)
}
defer fout.Close()
decoded, err := base64.StdEncoding.DecodeString(val)
if err != nil {
slog.Error("can't decode token", "err", err, "val", val)
log.Fatal(err)
}
if _, err := fout.Write(decoded); err != nil {
log.Fatal(err)
}
}
token, err := internal.ReadToken(filepath.Join(*dataDir, "patreon-token.json"))
if err != nil {
log.Fatalf("error reading token: %v", err)
}
cts := internal.CachingTokenSource(filepath.Join(*dataDir, "patreon-token.json"), &config, token)
s := &Server{
lc: lc,
cts: cts,
}
http.HandleFunc("/give-token", s.GiveToken)
http.HandleFunc("/metrics", tsweb.VarzHandler)
ln, err := srv.Listen("tcp", ":80")
if err != nil {
log.Fatal(err)
}
slog.Info("listening over tailscale", "hostname", *tailscaleHostname)
log.Fatal(http.Serve(ln, nil))
}
type Server struct {
lc *tailscale.LocalClient
cts oauth2.TokenSource
}
func (s *Server) GiveToken(w http.ResponseWriter, r *http.Request) {
whois, err := s.lc.WhoIs(r.Context(), r.RemoteAddr)
if err != nil {
slog.Error("whois failed", "err", err, "remoteAddr", r.RemoteAddr)
http.Error(w, "invalid remote address", http.StatusBadRequest)
return
}
tokenFetches.Add(whois.Node.Name, 1)
token, err := s.cts.Token()
if err != nil {
slog.Error("token fetch failed", "err", err)
http.Error(w, "token fetch failed", http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "application/json")
if err := json.NewEncoder(w).Encode(token); err != nil {
slog.Error("token encode failed", "err", err)
return
}
}
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