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package server
import (
"context"
"fmt"
"io"
"log"
"log/slog"
"mime"
"net"
"net/http"
"os"
"path"
"slices"
"strings"
"time"
cfg "website/internal/config"
"github.com/getsentry/sentry-go"
sentryhttp "github.com/getsentry/sentry-go/http"
"github.com/pkg/errors"
"github.com/shengyanli1982/law"
)
var config *cfg.Config
var (
CommitSHA string
ShortSHA string
)
type Config struct {
Production bool `conf:"default:false"`
InDevServer bool `conf:"default:false"`
Root string `conf:"default:website"`
ListenAddress string `conf:"default:localhost"`
Port string `conf:"default:3000,short:p"`
BaseURL cfg.URL `conf:"default:http://localhost:3000,short:b"`
}
type HTTPError struct {
Error error
Message string
Code int
}
type Server struct {
*http.Server
}
func canonicalisePath(path string) (cPath string, differs bool) {
cPath = path
if strings.HasSuffix(path, "/index.html") {
cPath, differs = strings.CutSuffix(path, "index.html")
} else if !strings.HasSuffix(path, "/") && files[path+"/"] != (File{}) {
cPath, differs = path+"/", true
}
return cPath, differs
}
func serveFile(w http.ResponseWriter, r *http.Request) *HTTPError {
urlPath, shouldRedirect := canonicalisePath(r.URL.Path)
if shouldRedirect {
http.Redirect(w, r, urlPath, 302)
return nil
}
file := GetFile(urlPath)
if file == (File{}) {
return &HTTPError{
Message: "File not found",
Code: http.StatusNotFound,
}
}
w.Header().Add("ETag", file.etag)
w.Header().Add("Vary", "Accept-Encoding")
w.Header().Add("Content-Security-Policy", config.CSP.String())
for k, v := range config.Extra.Headers {
w.Header().Add(k, v)
}
http.ServeFile(w, r, files[urlPath].filename)
return nil
}
type webHandler func(http.ResponseWriter, *http.Request) *HTTPError
func (fn webHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
defer func() {
if fail := recover(); fail != nil {
w.WriteHeader(http.StatusInternalServerError)
slog.Error("runtime panic!", "error", fail)
}
}()
w.Header().Set("Server", fmt.Sprintf("website (%s)", ShortSHA))
if err := fn(w, r); err != nil {
if strings.Contains(r.Header.Get("Accept"), "text/html") {
w.WriteHeader(err.Code)
notFoundPage := "website/private/404.html"
http.ServeFile(w, r, notFoundPage)
} else {
http.Error(w, err.Message, err.Code)
}
}
}
var newMIMEs = map[string]string{
".xsl": "text/xsl",
}
func fixupMIMETypes() {
for ext, newType := range newMIMEs {
if err := mime.AddExtensionType(ext, newType); err != nil {
slog.Error("could not update mime type", "ext", ext, "mime", newType)
}
}
}
func applyDevModeOverrides(config *cfg.Config) {
config.CSP.ScriptSrc = slices.Insert(config.CSP.ScriptSrc, 0, "'unsafe-inline'")
config.CSP.ConnectSrc = slices.Insert(config.CSP.ConnectSrc, 0, "'self'")
}
func New(runtimeConfig *Config) (*Server, error) {
fixupMIMETypes()
var err error
config, err = cfg.GetConfig()
if err != nil {
return nil, errors.WithMessage(err, "error parsing configuration file")
}
if runtimeConfig.InDevServer {
applyDevModeOverrides(config)
}
prefix := path.Join(runtimeConfig.Root, "public")
slog.Debug("registering content files", "prefix", prefix)
err = registerContentFiles(prefix)
if err != nil {
return nil, errors.WithMessagef(err, "registering content files")
}
env := "development"
if runtimeConfig.Production {
env = "production"
}
err = sentry.Init(sentry.ClientOptions{
EnableTracing: true,
TracesSampleRate: 1.0,
Dsn: os.Getenv("SENTRY_DSN"),
Release: CommitSHA,
Environment: env,
})
if err != nil {
return nil, errors.WithMessage(err, "could not set up sentry")
}
defer sentry.Flush(2 * time.Second)
sentryHandler := sentryhttp.New(sentryhttp.Options{
Repanic: true,
})
top := http.NewServeMux()
mux := http.NewServeMux()
slog.Debug("binding main handler to", "host", runtimeConfig.BaseURL.Hostname()+"/")
mux.Handle(runtimeConfig.BaseURL.Hostname()+"/", webHandler(serveFile))
mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
newURL := runtimeConfig.BaseURL.String() + r.URL.String()
http.Redirect(w, r, newURL, 301)
})
var logWriter io.Writer
if runtimeConfig.Production {
logWriter = law.NewWriteAsyncer(os.Stdout, nil)
} else {
logWriter = os.Stdout
}
top.Handle("/",
sentryHandler.Handle(
wrapHandlerWithLogging(mux, wrappedHandlerOptions{
defaultHostname: runtimeConfig.BaseURL.Hostname(),
logger: logWriter,
}),
),
)
// no logging, no sentry
top.HandleFunc("/health", func(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(http.StatusOK)
})
listenAddress := net.JoinHostPort(runtimeConfig.ListenAddress, runtimeConfig.Port)
return &Server{
&http.Server{
Addr: listenAddress,
Handler: top,
},
}, nil
}
func (s *Server) Start() error {
if err := s.ListenAndServe(); err != http.ErrServerClosed {
return err
}
return nil
}
func (s *Server) Stop() chan struct{} {
slog.Debug("stop called")
idleConnsClosed := make(chan struct{})
go func() {
slog.Debug("shutting down server")
ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
defer cancel()
err := s.Server.Shutdown(ctx)
slog.Debug("server shut down")
if err != nil {
// Error from closing listeners, or context timeout:
log.Printf("HTTP server Shutdown: %v", err)
}
close(idleConnsClosed)
}()
return idleConnsClosed
}
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