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package main
import (
"context"
"encoding/json"
"flag"
"fmt"
"io"
"log/slog"
"net/http"
"strings"
"time"
"github.com/go-git/go-git/v5"
"golang.org/x/oauth2"
"gopkg.in/mxpv/patreon-go.v1"
"xeiaso.net/v4/internal/lume"
"xeiaso.net/v4/internal/saasproxytoken"
)
var (
patreonWebhookSecret = flag.String("patreon-webhook-secret", "", "Patreon webhook secret")
)
func NewPatreonClient(hc *http.Client) (*patreon.Client, error) {
ts := saasproxytoken.RemoteTokenSource(*patreonSaasProxyURL, hc)
tc := oauth2.NewClient(context.Background(), ts)
client := patreon.NewClient(tc)
if u, err := client.FetchUser(); err != nil {
return nil, err
} else {
slog.Info("logged in as", "user", u.Data.Attributes.FullName)
}
return client, nil
}
type PatreonWebhook struct {
fs *lume.FS
}
func (p *PatreonWebhook) ServeHTTP(w http.ResponseWriter, r *http.Request) {
if !strings.HasPrefix(r.Header.Get(patreon.HeaderEventType), "pledges:") {
slog.Debug("not a pledge event", "event", r.Header.Get(patreon.HeaderEventType))
http.Error(w, "invalid request", http.StatusBadRequest)
return
}
defer r.Body.Close()
data, err := io.ReadAll(http.MaxBytesReader(w, r.Body, 8*1024*1024)) // 8 kb limit
if err != nil {
slog.Error("error reading body", "error", err)
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
ok, err := patreon.VerifySignature(data, *patreonWebhookSecret, r.Header.Get(patreon.HeaderSignature))
if err != nil {
slog.Error("error verifying signature", "error", err)
http.Error(w, "error reading body", http.StatusBadRequest)
return
}
if !ok {
slog.Error("invalid signature")
http.Error(w, "error reading body", http.StatusBadRequest)
return
}
webhookCount.Add("patreon", 1)
var event patreon.WebhookPledge
if err := json.Unmarshal(data, &event); err != nil {
slog.Error("error decoding event", "error", err)
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
slog.Info("new pledge!", "patron", event.Data.Relationships.Patron.Data.ID, "pledge", event.Data.ID, "amount", event.Data.Attributes.AmountCents)
go func() {
ctx, cancel := context.WithTimeout(context.Background(), 10*time.Minute)
defer cancel()
if err := p.fs.Update(ctx); err != nil {
buildErrors.Add(err.Error(), 1)
if err == git.NoErrAlreadyUpToDate {
slog.Info("already up to date")
return
}
slog.Error("error updating", "error", err)
}
}()
fmt.Fprintln(w, "Rebuild triggered")
}
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