330 lines
6.5 KiB
Go
330 lines
6.5 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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"fmt"
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"io"
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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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type appHandler func(http.ResponseWriter, *http.Request) error
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func (fn appHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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if err := fn(w, r); err != nil {
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http.Error(w, err.Error(), 500)
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}
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}
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const LOGDATE string = "2006-01-02T15:04:05.000-07:00"
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const PREFIX string = "/src"
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func stripQueryParam(inUrl string) (string, error) {
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url, err := url.Parse(inUrl)
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if err != nil {
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return "", err
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}
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url.RawQuery = ""
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return url.String(), nil
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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="/?f=%v&s=%v"><img src="`, r.URL.Query().Get("f"), r.URL.Query().Get("s"))
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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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strippedUrl, err := 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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prefixedFilePath, err := url.QueryUnescape(strippedUrl)
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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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if !pathIsValid(filePath, paths) {
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http.NotFound(w, r)
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}
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exists, err := fileExists(filePath)
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if err != nil {
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return err
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}
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if !exists {
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http.NotFound(w, r)
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return nil
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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) appHandler {
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return func(w http.ResponseWriter, r *http.Request) error {
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err := serveStaticFile(w, r, paths)
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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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}
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func serveHtmlHandler(paths []string) appHandler {
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return func(w http.ResponseWriter, r *http.Request) error {
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refererUri, err := stripQueryParam(refererToUri(r.Referer()))
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if err != nil {
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return err
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}
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filter := r.URL.Query().Get("f")
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sorting := r.URL.Query().Get("s")
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switch {
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case r.URL.Path == "/" && sorting == "asc" && refererUri != "":
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query, err := url.QueryUnescape(refererUri)
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if err != nil {
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return err
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}
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path, err := splitPath(query)
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if err != nil {
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return err
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}
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filePath, err := getNextFile(path)
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if err != nil {
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return err
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}
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if filePath == "" {
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filePath, err = pickFile(paths, filter, sorting)
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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 nil
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case err != nil:
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return err
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}
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path, err := splitPath(filePath)
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if err != nil {
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return err
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}
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filePath, err = getFirstFile(path)
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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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newUrl := fmt.Sprintf("%v%v?f=%v&s=%v", r.URL.Host, filePath, filter, sorting)
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http.Redirect(w, r, newUrl, http.StatusSeeOther)
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case r.URL.Path == "/" && sorting == "asc" && refererUri == "":
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filePath, err := pickFile(paths, filter, sorting)
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if err != nil && err == ErrNoImagesFound {
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http.NotFound(w, r)
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return nil
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} else if err != nil {
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return err
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}
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path, err := splitPath(filePath)
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if err != nil {
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return err
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}
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filePath, err = getFirstFile(path)
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if err != nil {
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return err
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}
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newUrl := fmt.Sprintf("%v%v?f=%v&s=%v", r.URL.Host, filePath, filter, sorting)
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http.Redirect(w, r, newUrl, http.StatusSeeOther)
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case r.URL.Path == "/" && sorting == "desc" && refererUri != "":
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query, err := url.QueryUnescape(refererUri)
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if err != nil {
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return err
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}
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path, err := splitPath(query)
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if err != nil {
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return err
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}
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filePath, err := getPreviousFile(path)
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if err != nil {
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return err
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}
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if filePath == "" {
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filePath, err = pickFile(paths, filter, sorting)
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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 nil
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case err != nil:
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return err
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}
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path, err := splitPath(filePath)
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if err != nil {
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return err
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}
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filePath, err = getLastFile(path)
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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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newUrl := fmt.Sprintf("%v%v?f=%v&s=%v", r.URL.Host, filePath, filter, sorting)
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http.Redirect(w, r, newUrl, http.StatusSeeOther)
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case r.URL.Path == "/" && sorting == "desc" && refererUri == "":
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filePath, err := pickFile(paths, filter, sorting)
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if err != nil && err == ErrNoImagesFound {
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http.NotFound(w, r)
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return nil
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} else if err != nil {
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return err
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}
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path, err := splitPath(filePath)
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if err != nil {
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return err
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}
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filePath, err = getLastFile(path)
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if err != nil {
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return err
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}
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newUrl := fmt.Sprintf("%v%v?f=%v&s=%v", r.URL.Host, filePath, filter, sorting)
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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, sorting)
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if err != nil && err == ErrNoImagesFound {
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http.NotFound(w, r)
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return nil
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} else if err != nil {
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return err
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}
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newUrl := fmt.Sprintf("%v%v?f=%v&s=%v", r.URL.Host, filePath, filter, sorting)
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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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image, err := isImage(filePath)
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if err != nil {
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return err
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}
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if !image {
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http.NotFound(w, r)
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return nil
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}
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err = serveHtml(w, r, filePath)
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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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return nil
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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) error {
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paths, err := normalizePaths(args)
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if err != nil {
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return 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.Handle("/", 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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err = http.ListenAndServe(":"+strconv.FormatInt(int64(Port), 10), nil)
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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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