244 lines
4.9 KiB
Go
244 lines
4.9 KiB
Go
/*
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Copyright © 2022 Seednode <seednode@seedno.de>
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*/
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package cmd
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import (
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"errors"
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"fmt"
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"io"
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"log"
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"net/http"
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"net/url"
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"os"
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"path/filepath"
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"strconv"
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"strings"
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"time"
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)
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const LOGDATE string = "2006-01-02T15:04:05.000000000-07:00"
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const PREFIX string = "/src"
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func stripQueryParam(inUrl string) string {
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u, err := url.Parse(inUrl)
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if err != nil {
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panic(err)
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}
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u.RawQuery = ""
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return u.String()
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}
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func refererToUri(referer string) string {
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parts := strings.SplitAfterN(referer, "/", 4)
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if len(parts) < 4 {
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return ""
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}
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return "/" + parts[3]
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}
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func serveHtml(w http.ResponseWriter, r http.Request, filePath string) error {
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fileName := filepath.Base(filePath)
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w.Header().Add("Content-Type", "text/html")
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htmlBody := `<html lang="en">
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<head>
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<style>img{max-width:100%;max-height:97vh;height:auto;}</style>
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<title>`
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htmlBody += fileName
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htmlBody += `</title>
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</head>
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<body>`
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htmlBody += fmt.Sprintf(`"<a href="/?filter=%v"><img src="`, r.URL.Query().Get("filter"))
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htmlBody += PREFIX + filePath
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htmlBody += `"></img></a>
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</body>
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</html>`
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_, err := io.WriteString(w, htmlBody)
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if err != nil {
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return err
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}
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return nil
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}
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func serveStaticFile(w http.ResponseWriter, r http.Request, paths []string) error {
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prefixedFilePath, err := url.QueryUnescape(stripQueryParam(r.URL.Path))
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if err != nil {
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return err
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}
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filePath := strings.TrimPrefix(prefixedFilePath, PREFIX)
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var matchesPrefix = false
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for i := 0; i < len(paths); i++ {
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if strings.HasPrefix(filePath, paths[i]) {
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matchesPrefix = true
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}
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}
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if !matchesPrefix {
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if Verbose {
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fmt.Printf("%v Failed to serve file outside specified path(s): %v\n", time.Now().Format(LOGDATE), filePath)
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}
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http.NotFound(w, &r)
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return nil
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}
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_, err = os.Stat(filePath)
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if errors.Is(err, os.ErrNotExist) {
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if Verbose {
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fmt.Printf("%v Failed to serve non-existent file: %v\n", time.Now().Format(LOGDATE), filePath)
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}
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http.NotFound(w, &r)
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return nil
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} else if !errors.Is(err, os.ErrNotExist) && err != nil {
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return err
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}
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var startTime time.Time
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if Verbose {
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startTime = time.Now()
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fmt.Printf("%v Serving file: %v", startTime.Format(LOGDATE), filePath)
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}
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buf, err := os.ReadFile(filePath)
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if err != nil {
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return err
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}
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w.Write(buf)
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if Verbose {
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fmt.Printf(" (Finished in %v)\n", time.Since(startTime).Round(time.Microsecond))
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}
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return nil
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}
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func serveStaticFileHandler(paths []string) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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err := serveStaticFile(w, *r, paths)
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if err != nil {
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log.Fatal(err)
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}
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}
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}
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func serveHtmlHandler(paths []string) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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refererUri := stripQueryParam(refererToUri(r.Referer()))
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filter := r.URL.Query().Get("filter")
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switch {
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case r.URL.Path == "/" && Successive && refererUri != "":
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query, err := url.QueryUnescape(refererUri)
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if err != nil {
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log.Fatal(err)
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}
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filePath, err := getNextFile(query)
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if err != nil {
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log.Fatal(err)
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}
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if filePath == "" {
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filePath, err = pickFile(paths, filter)
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switch {
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case err != nil && err == ErrNoImagesFound:
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http.NotFound(w, r)
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return
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case err != nil:
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log.Fatal(err)
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}
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filePath, err = getFirstFile(filePath)
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if err != nil {
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log.Fatal(err)
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}
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}
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newUrl := fmt.Sprintf("%v%v?filter=%v", r.URL.Host, filePath, filter)
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http.Redirect(w, r, newUrl, http.StatusSeeOther)
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case r.URL.Path == "/" && Successive && refererUri == "":
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filePath, err := pickFile(paths, filter)
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switch {
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case err != nil && err == ErrNoImagesFound:
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http.NotFound(w, r)
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return
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case err != nil:
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log.Fatal(err)
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}
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filePath, err = getFirstFile(filePath)
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if err != nil {
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log.Fatal(err)
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}
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newUrl := fmt.Sprintf("%v%v?filter=%v", r.URL.Host, filePath, filter)
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http.Redirect(w, r, newUrl, http.StatusSeeOther)
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case r.URL.Path == "/":
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filePath, err := pickFile(paths, filter)
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switch {
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case err != nil && err == ErrNoImagesFound:
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http.NotFound(w, r)
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return
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case err != nil:
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log.Fatal(err)
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}
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newUrl := fmt.Sprintf("%v%v?filter=%v", r.URL.Host, filePath, filter)
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http.Redirect(w, r, newUrl, http.StatusSeeOther)
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default:
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filePath := r.URL.Path
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isImage, err := checkIfImage(filePath)
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if err != nil {
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log.Fatal(err)
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}
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if !isImage {
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http.NotFound(w, r)
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}
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err = serveHtml(w, *r, filePath)
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if err != nil {
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log.Fatal(err)
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}
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}
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}
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}
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func doNothing(http.ResponseWriter, *http.Request) {}
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func ServePage(args []string) {
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paths, err := normalizePaths(args)
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if err != nil {
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log.Fatal(err)
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}
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for _, i := range paths {
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fmt.Println("Paths: " + i)
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}
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http.HandleFunc("/", serveHtmlHandler(paths))
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http.Handle(PREFIX+"/", http.StripPrefix(PREFIX, serveStaticFileHandler(paths)))
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http.HandleFunc("/favicon.ico", doNothing)
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port := strconv.Itoa(Port)
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err = http.ListenAndServe(":"+port, nil)
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if err != nil {
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log.Fatal(err)
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}
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}
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