357 lines
6.7 KiB
Go
357 lines
6.7 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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"math/rand"
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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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"regexp"
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"runtime"
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"strconv"
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"strings"
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"time"
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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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PREFIX string = "/src"
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RedirectStatusCode int = http.StatusSeeOther
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)
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type Filters struct {
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Includes []string
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Excludes []string
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}
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func (f *Filters) IsEmpty() bool {
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return !(f.HasIncludes() && f.HasExcludes())
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}
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func (f *Filters) HasIncludes() bool {
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return len(f.Includes) != 0
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}
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func (f *Filters) GetIncludes() string {
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return strings.Join(f.Includes, ",")
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}
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func (f *Filters) HasExcludes() bool {
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return len(f.Excludes) != 0
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}
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func (f *Filters) GetExcludes() string {
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return strings.Join(f.Excludes, ",")
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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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func notFound(w http.ResponseWriter, r *http.Request) error {
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w.WriteHeader(404)
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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>
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a{display:block;height:100%;width:100%;text-decoration:none;color:inherit;cursor:auto;}
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</style>
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<title>
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Not Found
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</title>
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</head>
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<body>
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<a href="/">404 page not found</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 splitQueryParams(query string) []string {
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if query == "" {
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return []string{}
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}
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params := strings.Split(query, ",")
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for i := 0; i < len(params); i++ {
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params[i] = strings.ToLower(params[i])
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}
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return params
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}
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func generateQueryParams(filters *Filters, sortOrder string) string {
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switch {
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case Filter && !Sort:
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return fmt.Sprintf("?include=%v&exclude=%v",
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filters.GetIncludes(),
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filters.GetExcludes(),
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)
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case !Filter && Sort:
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return fmt.Sprintf("?sort=%v", sortOrder)
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case Filter && Sort:
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return fmt.Sprintf("?include=%v&exclude=%v&sort=%v",
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filters.GetIncludes(),
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filters.GetExcludes(),
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sortOrder,
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)
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}
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return ""
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}
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func stripQueryParams(u string) (string, error) {
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uri, err := url.Parse(u)
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if err != nil {
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return "", err
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}
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uri.RawQuery = ""
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escapedUri, err := url.QueryUnescape(uri.String())
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if err != nil {
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return "", err
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}
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if runtime.GOOS == "windows" {
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return strings.TrimPrefix(escapedUri, "/"), nil
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}
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return escapedUri, nil
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}
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func generateFilePath(filePath string) string {
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htmlBody := PREFIX
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if runtime.GOOS == "windows" {
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htmlBody += "/"
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}
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htmlBody += filePath
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return htmlBody
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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, dimensions string, filters *Filters) 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>
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a{display:block;height:100%;width:100%;text-decoration:none}
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img{max-width:100%;max-height:97vh;height:auto;}
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</style>
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<title>`
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htmlBody += fmt.Sprintf("%v (%v)", fileName, dimensions)
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htmlBody += `</title>
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</head>
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<body>
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<a href="/`
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htmlBody += generateQueryParams(filters, r.URL.Query().Get("sort"))
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htmlBody += `"><img src="`
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htmlBody += generateFilePath(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 := stripQueryParams(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, err := filepath.EvalSymlinks(strings.TrimPrefix(prefixedFilePath, PREFIX))
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if err != nil {
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return err
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}
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if !pathIsValid(filePath, paths) {
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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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notFound(w, r)
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return nil
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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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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("%v | Served %v (%v) to %v in %v\n",
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startTime.Format(LOGDATE),
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filePath,
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humanReadableSize(len(buf)),
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r.RemoteAddr,
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time.Since(startTime).Round(time.Microsecond),
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)
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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, re regexp.Regexp, fileCache *[]string) appHandler {
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return func(w http.ResponseWriter, r *http.Request) error {
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refererUri, err := stripQueryParams(refererToUri(r.Referer()))
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if err != nil {
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return err
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}
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filters := Filters{}
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filters.Includes = splitQueryParams(r.URL.Query().Get("include"))
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filters.Excludes = splitQueryParams(r.URL.Query().Get("exclude"))
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sortOrder := r.URL.Query().Get("sort")
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if r.URL.Path == "/" {
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var filePath string
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var err error
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if refererUri != "" {
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filePath, err = getNextFile(refererUri, sortOrder, re)
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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 filePath == "" {
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filePath, err = getNewFile(paths, &filters, sortOrder, re, fileCache)
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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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case err != nil:
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return err
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}
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}
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newUrl := fmt.Sprintf("http://%v%v%v",
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r.Host,
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preparePath(filePath),
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generateQueryParams(&filters, sortOrder),
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)
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http.Redirect(w, r, newUrl, RedirectStatusCode)
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} else {
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filePath := r.URL.Path
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if runtime.GOOS == "windows" {
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filePath = strings.TrimPrefix(filePath, "/")
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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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notFound(w, r)
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}
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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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notFound(w, r)
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}
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dimensions, err := getImageDimensions(filePath)
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if err != nil {
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return err
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}
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err = serveHtml(w, r, filePath, dimensions, &filters)
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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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fmt.Printf("roulette v%v\n\n", Version)
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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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re := regexp.MustCompile(`(.+)([0-9]{3})(\..+)`)
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rand.Seed(time.Now().UnixNano())
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fileCache := []string{}
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http.Handle("/", serveHtmlHandler(paths, *re, &fileCache))
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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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