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package server
import (
"context"
"fmt"
"net"
"net/http"
"net/url"
"os"
"path/filepath"
"slices"
"strconv"
"strings"
"time"
"go.alanpearce.eu/website/internal/builder"
cfg "go.alanpearce.eu/website/internal/config"
"go.alanpearce.eu/website/internal/log"
"go.alanpearce.eu/website/internal/vcs"
"go.alanpearce.eu/website/internal/website"
"github.com/ardanlabs/conf/v3"
"github.com/osdevisnot/sorvor/pkg/livereload"
"github.com/pkg/errors"
)
var (
CommitSHA = "local"
ShortSHA = "local"
serverHeader = fmt.Sprintf("website (%s)", ShortSHA)
)
type Config struct {
Root string `conf:"default:public"`
Redirect bool `conf:"default:true"`
ListenAddress string `conf:"default:localhost"`
Port int `conf:"default:8080,short:p"`
TLSPort int `conf:"default:8443"`
TLS bool `conf:"default:false"`
Development bool `conf:"default:false,flag:dev"`
ACMECA string `conf:"env:ACME_CA"`
ACMECACert string `conf:"env:ACME_CA_CERT"`
Domains string
}
type Server struct {
*http.Server
redirectHandler func(http.ResponseWriter, *http.Request)
runtimeConfig *Config
config *cfg.Config
}
func applyDevModeOverrides(config *cfg.Config, runtimeConfig *Config) {
config.CSP.ScriptSrc = slices.Insert(config.CSP.ScriptSrc, 0, "'unsafe-inline'")
config.CSP.ConnectSrc = slices.Insert(config.CSP.ConnectSrc, 0, "'self'")
if runtimeConfig.Domains != "" {
config.Domains = strings.Split(runtimeConfig.Domains, ",")
} else {
config.Domains = []string{runtimeConfig.ListenAddress}
}
scheme := "http"
port := runtimeConfig.Port
if runtimeConfig.TLS {
scheme = "https"
port = runtimeConfig.TLSPort
}
config.BaseURL = cfg.URL{
URL: &url.URL{
Scheme: scheme,
Host: net.JoinHostPort(config.Domains[0], strconv.Itoa(port)),
},
}
}
func updateCSPHashes(config *cfg.Config, r *builder.Result) {
clear(config.CSP.StyleSrc)
for i, h := range r.Hashes {
config.CSP.StyleSrc[i] = fmt.Sprintf("'%s'", h)
}
}
func serverHeaderHandler(wrappedHandler http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Server", serverHeader)
wrappedHandler.ServeHTTP(w, r)
})
}
func rebuild(builderConfig *builder.IOConfig, config *cfg.Config) error {
r, err := builder.BuildSite(builderConfig, config)
if err != nil {
return errors.WithMessage(err, "could not build site")
}
updateCSPHashes(config, r)
return nil
}
func New(runtimeConfig *Config) (*Server, error) {
builderConfig := &builder.IOConfig{
Destination: runtimeConfig.Root,
Development: runtimeConfig.Development,
}
if !runtimeConfig.Development {
vcsConfig := &vcs.Config{}
_, err := conf.Parse("VCS", vcsConfig)
if err != nil {
return nil, err
}
_, err = vcs.CloneOrUpdate(vcsConfig)
if err != nil {
return nil, err
}
err = os.Chdir(runtimeConfig.Root)
if err != nil {
return nil, err
}
builderConfig.Source = vcsConfig.LocalPath
publicDir := filepath.Join(runtimeConfig.Root, "public")
builderConfig.Destination = publicDir
runtimeConfig.Root = publicDir
}
config, err := cfg.GetConfig(builderConfig.Source)
if err != nil {
return nil, errors.WithMessage(err, "error parsing configuration file")
}
if runtimeConfig.Development {
applyDevModeOverrides(config, runtimeConfig)
}
listenAddress := net.JoinHostPort(runtimeConfig.ListenAddress, strconv.Itoa(runtimeConfig.Port))
top := http.NewServeMux()
err = rebuild(builderConfig, config)
if err != nil {
return nil, err
}
if runtimeConfig.Development {
liveReload := livereload.New()
top.Handle("/_/reload", liveReload)
liveReload.Start()
fw, err := NewFileWatcher()
if err != nil {
return nil, errors.WithMessage(err, "could not create file watcher")
}
for _, dir := range []string{"content", "static", "templates", "internal/builder"} {
err := fw.AddRecursive(dir)
if err != nil {
return nil, errors.WithMessagef(
err,
"could not add directory %s to file watcher",
dir,
)
}
}
err = fw.Add(".")
if err != nil {
return nil, errors.WithMessage(err, "could not add directory to file watcher")
}
go fw.Start(func(filename string) {
log.Info("rebuilding site", "changed_file", filename)
err := rebuild(builderConfig, config)
if err != nil {
log.Error("error rebuilding site", "error", err)
}
})
}
loggingMux := http.NewServeMux()
mux, err := website.NewMux(config, runtimeConfig.Root)
if err != nil {
return nil, errors.Wrap(err, "could not create website mux")
}
redirectHandler := func(w http.ResponseWriter, r *http.Request) {
path, _ := website.CanonicalisePath(r.URL.Path)
newURL := config.BaseURL.JoinPath(path)
http.Redirect(w, r, newURL.String(), 301)
}
if runtimeConfig.Redirect {
loggingMux.Handle(config.BaseURL.Hostname()+"/", mux)
loggingMux.HandleFunc("/", redirectHandler)
} else {
loggingMux.Handle("/", mux)
}
top.Handle("/",
serverHeaderHandler(
wrapHandlerWithLogging(loggingMux),
),
)
top.HandleFunc("/health", func(w http.ResponseWriter, _ *http.Request) {
w.WriteHeader(http.StatusNoContent)
})
return &Server{
Server: &http.Server{
ReadHeaderTimeout: 10 * time.Second,
ReadTimeout: 1 * time.Minute,
WriteTimeout: 2 * time.Minute,
IdleTimeout: 10 * time.Minute,
Addr: listenAddress,
Handler: top,
},
redirectHandler: redirectHandler,
config: config,
runtimeConfig: runtimeConfig,
}, nil
}
func (s *Server) serve(tls bool) error {
if tls {
return s.serveTLS()
}
return s.serveTCP()
}
func (s *Server) Start() error {
if err := s.serve(s.runtimeConfig.TLS); err != http.ErrServerClosed {
return errors.Wrap(err, "error creating/closing server")
}
return nil
}
func (s *Server) Stop() chan struct{} {
log.Debug("stop called")
idleConnsClosed := make(chan struct{})
go func() {
log.Debug("shutting down server")
ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
defer cancel()
err := s.Server.Shutdown(ctx)
log.Debug("server shut down")
if err != nil {
// Error from closing listeners, or context timeout:
log.Warn("HTTP server Shutdown", "error", err)
}
close(idleConnsClosed)
}()
return idleConnsClosed
}
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