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|
package main
import (
"context"
"errors"
"flag"
"fmt"
"net"
"net/http"
"net/http/httputil"
"net/url"
"os"
"os/signal"
"path"
"strconv"
"strings"
"syscall"
"time"
"github.com/emersion/go-sasl"
"github.com/mediocregopher/blog.mediocregopher.com/srv/mailinglist"
"github.com/mediocregopher/blog.mediocregopher.com/srv/pow"
"github.com/mediocregopher/mediocre-go-lib/v2/mctx"
"github.com/mediocregopher/mediocre-go-lib/v2/mlog"
"github.com/tilinna/clock"
)
func loggerFatalErr(ctx context.Context, logger *mlog.Logger, descr string, err error) {
logger.Fatal(ctx, fmt.Sprintf("%s: %v", descr, err))
}
func main() {
ctx := context.Background()
logger := mlog.NewLogger(nil)
defer logger.Close()
logger.Info(ctx, "process started")
defer logger.Info(ctx, "process exiting")
publicURLStr := flag.String("public-url", "http://localhost:4000", "URL this service is accessible at")
listenProto := flag.String("listen-proto", "tcp", "Protocol to listen for HTTP requests with")
listenAddr := flag.String("listen-addr", ":4000", "Address/path to listen for HTTP requests on")
dataDir := flag.String("data-dir", ".", "Directory to use for long term storage")
staticDir := flag.String("static-dir", "", "Directory from which static files are served (mutually exclusive with -static-proxy-url)")
staticProxyURLStr := flag.String("static-proxy-url", "", "HTTP address from which static files are served (mutually exclusive with -static-dir)")
powTargetStr := flag.String("pow-target", "0x0000FFFF", "Proof-of-work target, lower is more difficult")
powSecret := flag.String("pow-secret", "", "Secret used to sign proof-of-work challenge seeds")
smtpAddr := flag.String("ml-smtp-addr", "", "Address of SMTP server to use for sending emails for the mailing list")
smtpAuthStr := flag.String("ml-smtp-auth", "", "user:pass to use when authenticating with the mailing list SMTP server. The given user will also be used as the From address.")
// parse config
flag.Parse()
switch {
case *staticDir == "" && *staticProxyURLStr == "":
logger.Fatal(ctx, "-static-dir or -static-proxy-url is required")
case *powSecret == "":
logger.Fatal(ctx, "-pow-secret is required")
case *smtpAddr == "":
logger.Fatal(ctx, "-ml-smtp-addr is required")
case *smtpAuthStr == "":
logger.Fatal(ctx, "-ml-smtp-auth is required")
}
publicURL, err := url.Parse(*publicURLStr)
if err != nil {
loggerFatalErr(ctx, logger, "parsing -public-url", err)
}
var staticProxyURL *url.URL
if *staticProxyURLStr != "" {
var err error
if staticProxyURL, err = url.Parse(*staticProxyURLStr); err != nil {
loggerFatalErr(ctx, logger, "parsing -static-proxy-url", err)
}
}
powTargetUint, err := strconv.ParseUint(*powTargetStr, 0, 32)
if err != nil {
loggerFatalErr(ctx, logger, "parsing -pow-target", err)
}
powTarget := uint32(powTargetUint)
smtpAuthParts := strings.SplitN(*smtpAuthStr, ":", 2)
if len(smtpAuthParts) < 2 {
logger.Fatal(ctx, "invalid -ml-smtp-auth")
}
smtpAuth := sasl.NewPlainClient("", smtpAuthParts[0], smtpAuthParts[1])
smtpSendAs := smtpAuthParts[0]
// initialization
ctx = mctx.Annotate(ctx,
"publicURL", publicURL.String(),
"listenProto", *listenProto,
"listenAddr", *listenAddr,
"dataDir", *dataDir,
"powTarget", fmt.Sprintf("%x", powTarget),
"smtpAddr", *smtpAddr,
"smtpSendAs", smtpSendAs,
)
if *staticDir != "" {
ctx = mctx.Annotate(ctx, "staticDir", *staticDir)
} else {
ctx = mctx.Annotate(ctx, "staticProxyURL", *staticProxyURLStr)
}
clock := clock.Realtime()
powStore := pow.NewMemoryStore(clock)
defer powStore.Close()
powMgr := pow.NewManager(pow.ManagerParams{
Clock: clock,
Store: powStore,
Secret: []byte(*powSecret),
Target: powTarget,
})
// sugar
requirePow := func(h http.Handler) http.Handler { return requirePowMiddleware(powMgr, h) }
mailer := mailinglist.NewMailer(mailinglist.MailerParams{
SMTPAddr: *smtpAddr,
SMTPAuth: smtpAuth,
SendAs: smtpSendAs,
})
mlStore, err := mailinglist.NewStore(path.Join(*dataDir, "mailinglist.sqlite3"))
if err != nil {
loggerFatalErr(ctx, logger, "initializing mailing list storage", err)
}
defer mlStore.Close()
ml := mailinglist.New(mailinglist.Params{
Store: mlStore,
Mailer: mailer,
Clock: clock,
FinalizeSubURL: publicURL.String() + "/mailinglist/finalize.html",
UnsubURL: publicURL.String() + "/mailinglist/unsubscribe.html",
})
mux := http.NewServeMux()
var staticHandler http.Handler
if *staticDir != "" {
staticHandler = http.FileServer(http.Dir(*staticDir))
} else {
staticHandler = httputil.NewSingleHostReverseProxy(staticProxyURL)
}
mux.Handle("/", staticHandler)
apiMux := http.NewServeMux()
apiMux.Handle("/pow/challenge", newPowChallengeHandler(powMgr))
apiMux.Handle("/pow/check",
requirePow(
http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {}),
),
)
apiMux.Handle("/mailinglist/subscribe", requirePow(mailingListSubscribeHandler(ml)))
apiMux.Handle("/mailinglist/finalize", mailingListFinalizeHandler(ml))
apiMux.Handle("/mailinglist/unsubscribe", mailingListUnsubscribeHandler(ml))
apiHandler := logMiddleware(logger.WithNamespace("api"), apiMux)
apiHandler = annotateMiddleware(apiHandler)
apiHandler = addResponseHeaders(map[string]string{
"Cache-Control": "no-store, max-age=0",
"Pragma": "no-cache",
"Expires": "0",
}, apiHandler)
mux.Handle("/api/", http.StripPrefix("/api", apiHandler))
// run
logger.Info(ctx, "listening")
l, err := net.Listen(*listenProto, *listenAddr)
if err != nil {
loggerFatalErr(ctx, logger, "creating listen socket", err)
}
if *listenProto == "unix" {
if err := os.Chmod(*listenAddr, 0777); err != nil {
loggerFatalErr(ctx, logger, "chmod-ing unix socket", err)
}
}
srv := &http.Server{Handler: mux}
go func() {
if err := srv.Serve(l); err != nil && !errors.Is(err, http.ErrServerClosed) {
loggerFatalErr(ctx, logger, "serving http server", err)
}
}()
defer func() {
closeCtx, cancel := context.WithTimeout(ctx, 5*time.Second)
defer cancel()
logger.Info(ctx, "beginning graceful shutdown of http server")
if err := srv.Shutdown(closeCtx); err != nil {
loggerFatalErr(ctx, logger, "gracefully shutting down http server", err)
}
}()
sigCh := make(chan os.Signal)
signal.Notify(sigCh, syscall.SIGINT, syscall.SIGTERM)
<-sigCh
// let the defers begin
}
|
