527 lines
10 KiB
Go
527 lines
10 KiB
Go
/*
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Copyright © 2023 Seednode <seednode@seedno.de>
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*/
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package cmd
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import (
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"bytes"
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"context"
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"errors"
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"fmt"
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"io"
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"net"
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"net/http"
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"os"
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"path/filepath"
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"regexp"
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"runtime"
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"strconv"
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"strings"
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"sync"
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"syscall"
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"time"
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"github.com/julienschmidt/httprouter"
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"github.com/yosssi/gohtml"
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"seedno.de/seednode/roulette/types"
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"seedno.de/seednode/roulette/types/audio"
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"seedno.de/seednode/roulette/types/code"
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"seedno.de/seednode/roulette/types/flash"
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"seedno.de/seednode/roulette/types/images"
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"seedno.de/seednode/roulette/types/text"
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"seedno.de/seednode/roulette/types/video"
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)
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const (
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logDate string = `2006-01-02T15:04:05.000-07:00`
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sourcePrefix string = `/source`
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mediaPrefix string = `/view`
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RedirectStatusCode int = http.StatusSeeOther
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timeout time.Duration = 10 * time.Second
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)
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func preparePath(path string) string {
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if runtime.GOOS == "windows" {
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return fmt.Sprintf("%s/%s", mediaPrefix, filepath.ToSlash(path))
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}
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return mediaPrefix + path
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}
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func serveStaticFile(paths []string, cache *fileCache, errorChannel chan<- error) httprouter.Handle {
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return func(w http.ResponseWriter, r *http.Request, p httprouter.Params) {
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prefix := Prefix + sourcePrefix
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path := strings.TrimPrefix(r.URL.Path, prefix)
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prefixedFilePath, err := stripQueryParams(path)
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if err != nil {
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errorChannel <- err
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serverError(w, r, nil)
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return
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}
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filePath, err := filepath.EvalSymlinks(strings.TrimPrefix(prefixedFilePath, prefix))
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if err != nil {
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errorChannel <- err
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serverError(w, r, nil)
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return
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}
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if !pathIsValid(filePath, paths) {
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notFound(w, r, filePath)
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return
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}
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exists, err := fileExists(filePath)
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if err != nil {
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errorChannel <- err
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serverError(w, r, nil)
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return
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}
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if !exists {
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notFound(w, r, filePath)
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return
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}
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startTime := time.Now()
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buf, err := os.ReadFile(filePath)
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if err != nil {
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errorChannel <- err
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serverError(w, r, nil)
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return
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}
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var status string
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written, err := w.Write(buf)
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switch {
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case errors.Is(err, syscall.EPIPE):
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status = " (incomplete)"
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case err != nil:
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errorChannel <- err
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serverError(w, r, nil)
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return
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}
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refererUri, err := stripQueryParams(refererToUri(r.Referer()))
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if err != nil {
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errorChannel <- err
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serverError(w, r, nil)
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return
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}
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if Russian && refererUri != "" {
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err = kill(filePath, cache)
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if err != nil {
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errorChannel <- err
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serverError(w, r, nil)
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return
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}
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}
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if Verbose {
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fmt.Printf("%s | Serve: %s (%s) to %s in %s%s\n",
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startTime.Format(logDate),
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filePath,
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humanReadableSize(written),
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realIP(r),
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time.Since(startTime).Round(time.Microsecond),
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status,
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)
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}
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}
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}
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func serveRoot(paths []string, regexes *regexes, cache *fileCache, formats *types.Types, errorChannel chan<- error) httprouter.Handle {
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return func(w http.ResponseWriter, r *http.Request, p httprouter.Params) {
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refererUri, err := stripQueryParams(refererToUri(r.Referer()))
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if err != nil {
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errorChannel <- err
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serverError(w, r, nil)
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return
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}
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strippedRefererUri := strings.TrimPrefix(refererUri, Prefix+mediaPrefix)
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filters := &filters{
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included: splitQueryParams(r.URL.Query().Get("include"), regexes),
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excluded: splitQueryParams(r.URL.Query().Get("exclude"), regexes),
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}
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sortOrder := sortOrder(r)
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_, refreshInterval := refreshInterval(r)
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var path string
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if refererUri != "" {
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path, err = nextFile(strippedRefererUri, sortOrder, regexes, formats)
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if err != nil {
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errorChannel <- err
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serverError(w, r, nil)
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return
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}
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}
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list, err := fileList(paths, filters, sortOrder, cache, formats)
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if err != nil {
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errorChannel <- err
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serverError(w, r, nil)
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return
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}
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loop:
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for timeout := time.After(timeout); ; {
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select {
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case <-timeout:
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break loop
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default:
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}
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if path != "" {
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break loop
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}
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path, err = newFile(list, sortOrder, regexes, formats)
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switch {
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case err != nil && err == ErrNoMediaFound:
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notFound(w, r, path)
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return
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case err != nil:
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errorChannel <- err
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serverError(w, r, nil)
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return
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}
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}
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queryParams := generateQueryParams(filters, sortOrder, refreshInterval)
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newUrl := fmt.Sprintf("http://%s%s%s%s",
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r.Host,
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Prefix,
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preparePath(path),
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queryParams,
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)
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http.Redirect(w, r, newUrl, RedirectStatusCode)
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}
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}
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func serveMedia(paths []string, regexes *regexes, cache *fileCache, formats *types.Types, errorChannel chan<- error) httprouter.Handle {
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return func(w http.ResponseWriter, r *http.Request, p httprouter.Params) {
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filters := &filters{
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included: splitQueryParams(r.URL.Query().Get("include"), regexes),
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excluded: splitQueryParams(r.URL.Query().Get("exclude"), regexes),
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}
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sortOrder := sortOrder(r)
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path := strings.TrimPrefix(strings.TrimPrefix(r.URL.Path, Prefix), mediaPrefix)
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if runtime.GOOS == "windows" {
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path = strings.TrimPrefix(path, "/")
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}
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exists, err := fileExists(path)
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if err != nil {
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errorChannel <- err
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serverError(w, r, nil)
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return
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}
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if !exists {
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notFound(w, r, path)
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return
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}
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format := formats.FileType(path)
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if format == nil {
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serverError(w, r, nil)
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return
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}
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if !format.Validate(path) {
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notFound(w, r, path)
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return
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}
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mimeType := format.MimeType(path)
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fileUri := Prefix + generateFileUri(path)
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fileName := filepath.Base(path)
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w.Header().Add("Content-Type", "text/html")
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refreshTimer, refreshInterval := refreshInterval(r)
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rootUrl := Prefix + "/" + generateQueryParams(filters, sortOrder, refreshInterval)
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var htmlBody strings.Builder
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htmlBody.WriteString(`<!DOCTYPE html><html class="bg" lang="en"><head>`)
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htmlBody.WriteString(faviconHtml)
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htmlBody.WriteString(fmt.Sprintf(`<style>%s</style>`, format.Css()))
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title, err := format.Title(rootUrl, fileUri, path, fileName, Prefix, mimeType)
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if err != nil {
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errorChannel <- err
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serverError(w, r, nil)
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return
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}
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htmlBody.WriteString(title)
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htmlBody.WriteString(`</head><body>`)
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if refreshInterval != "0ms" {
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htmlBody.WriteString(fmt.Sprintf("<script>window.onload = function(){setInterval(function(){window.location.href = '%s';}, %d);};</script>",
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rootUrl,
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refreshTimer))
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}
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body, err := format.Body(rootUrl, fileUri, path, fileName, Prefix, mimeType)
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if err != nil {
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errorChannel <- err
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serverError(w, r, nil)
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return
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}
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htmlBody.WriteString(body)
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htmlBody.WriteString(`</body></html>`)
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startTime := time.Now()
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formattedPage := gohtml.Format(htmlBody.String())
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written, err := io.WriteString(w, formattedPage)
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if err != nil {
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errorChannel <- err
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serverError(w, r, nil)
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return
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}
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if format.Type() != "embed" {
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if Verbose {
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fmt.Printf("%s | Serve: %s (%s) to %s in %s\n",
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startTime.Format(logDate),
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path,
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humanReadableSize(written),
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realIP(r),
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time.Since(startTime).Round(time.Microsecond),
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)
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}
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if Russian {
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kill(path, cache)
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}
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}
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}
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}
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func serveVersion() httprouter.Handle {
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return func(w http.ResponseWriter, r *http.Request, p httprouter.Params) {
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data := []byte(fmt.Sprintf("roulette v%s\n", ReleaseVersion))
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w.Header().Write(bytes.NewBufferString("Content-Length: " + strconv.Itoa(len(data))))
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w.Write(data)
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}
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}
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func register(mux *httprouter.Router, path string, handle httprouter.Handle) {
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mux.GET(path, handle)
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if Handlers {
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fmt.Printf("Registered handler for path %s\n", path)
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}
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}
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func redirectRoot() httprouter.Handle {
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return func(w http.ResponseWriter, r *http.Request, p httprouter.Params) {
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newUrl := fmt.Sprintf("http://%s%s",
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r.Host,
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Prefix,
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)
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http.Redirect(w, r, newUrl, RedirectStatusCode)
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}
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}
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func ServePage(args []string) error {
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timeZone := os.Getenv("TZ")
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if timeZone != "" {
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var err error
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time.Local, err = time.LoadLocation(timeZone)
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if err != nil {
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return err
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}
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}
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bindHost, err := net.LookupHost(Bind)
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if err != nil {
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return err
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}
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bindAddr := net.ParseIP(bindHost[0])
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if bindAddr == nil {
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return errors.New("invalid bind address provided")
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}
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formats := &types.Types{
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Extensions: make(map[string]types.Type),
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}
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if Audio || All {
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formats.Add(audio.New())
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}
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if Code || All {
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formats.Add(code.New(CodeTheme))
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}
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if Flash || All {
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formats.Add(flash.New())
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}
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if Text || All {
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formats.Add(text.New())
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}
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if Videos || All {
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formats.Add(video.New())
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}
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// enable image support if no other flags are passed, to retain backwards compatibility
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// to be replaced with rootCmd.MarkFlagsOneRequired on next spf13/cobra update
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if Images || All || len(formats.Extensions) == 0 {
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formats.Add(images.New())
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}
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paths, err := validatePaths(args, formats)
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if err != nil {
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return err
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}
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if len(paths) == 0 {
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return ErrNoMediaFound
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}
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cache := &fileCache{
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mutex: sync.RWMutex{},
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list: []string{},
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}
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regexes := ®exes{
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filename: regexp.MustCompile(`(.+)([0-9]{3})(\..+)`),
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alphanumeric: regexp.MustCompile(`^[A-z0-9]*$`),
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}
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mux := httprouter.New()
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srv := &http.Server{
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Addr: net.JoinHostPort(Bind, strconv.Itoa(int(Port))),
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Handler: mux,
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IdleTimeout: 10 * time.Minute,
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ReadTimeout: 5 * time.Second,
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WriteTimeout: 5 * time.Minute,
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}
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mux.PanicHandler = serverErrorHandler()
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if !strings.HasSuffix(Prefix, "/") {
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Prefix = Prefix + "/"
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}
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errorChannel := make(chan error)
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register(mux, Prefix, serveRoot(paths, regexes, cache, formats, errorChannel))
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Prefix = strings.TrimSuffix(Prefix, "/")
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if Prefix != "" {
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register(mux, "/", redirectRoot())
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}
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register(mux, Prefix+"/favicons/*favicon", serveFavicons(errorChannel))
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register(mux, Prefix+"/favicon.ico", serveFavicons(errorChannel))
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register(mux, Prefix+mediaPrefix+"/*media", serveMedia(paths, regexes, cache, formats, errorChannel))
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register(mux, Prefix+sourcePrefix+"/*static", serveStaticFile(paths, cache, errorChannel))
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register(mux, Prefix+"/version", serveVersion())
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if Cache {
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err = registerCacheHandlers(mux, args, cache, formats, errorChannel)
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if err != nil {
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return err
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}
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}
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if Info {
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registerInfoHandlers(mux, args, cache, formats, errorChannel)
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}
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if Profile {
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registerProfileHandlers(mux)
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}
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if Russian {
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fmt.Printf("WARNING! Files *will* be deleted after serving!\n\n")
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}
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go func() {
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for err := range errorChannel {
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fmt.Printf("%s | Error: %v\n", time.Now().Format(logDate), err)
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if ExitOnError {
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fmt.Printf("%s | Error: Shutting down...\n", time.Now().Format(logDate))
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srv.Shutdown(context.Background())
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}
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}
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}()
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err = srv.ListenAndServe()
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if !errors.Is(err, http.ErrServerClosed) {
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return err
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}
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return nil
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}
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