438 lines
8.9 KiB
Go
438 lines
8.9 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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"fmt"
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"io"
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"log"
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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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"github.com/yosssi/gohtml"
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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 Regexes struct {
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Alphanumeric *regexp.Regexp
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Filename *regexp.Regexp
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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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func notFound(w http.ResponseWriter, r *http.Request, filePath string) error {
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startTime := time.Now()
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if Verbose {
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fmt.Printf("%v | Unavailable file %v requested by %v\n",
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startTime.Format(LogDate),
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filePath,
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r.RemoteAddr,
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)
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}
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w.WriteHeader(404)
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w.Header().Add("Content-Type", "text/html")
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var htmlBody strings.Builder
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htmlBody.WriteString(`<!DOCTYPE html><html lang="en"><head>`)
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htmlBody.WriteString(`<style>a{display:block;height:100%;width:100%;text-decoration:none;color:inherit;cursor:auto;}</style>`)
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htmlBody.WriteString(`<title>Not Found</title></head>`)
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htmlBody.WriteString(`<body><a href="/">404 page not found</a></body></html>`)
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_, err := io.WriteString(w, gohtml.Format(htmlBody.String()))
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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 getRefreshInterval(r *http.Request) string {
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refreshInterval := r.URL.Query().Get("refresh")
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if refreshInterval == "" {
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refreshInterval = "0"
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}
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num, err := strconv.Atoi(refreshInterval)
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if err != nil || num < 0 {
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refreshInterval = "0"
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}
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return refreshInterval
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}
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func getSortOrder(r *http.Request) string {
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sortOrder := r.URL.Query().Get("sort")
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if !(sortOrder == "asc" || sortOrder == "desc") {
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sortOrder = ""
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}
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return sortOrder
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}
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func splitQueryParams(query string, regexes *Regexes) []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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isAlphanumeric := regexes.Alphanumeric.MatchString(params[i])
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if isAlphanumeric {
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params[i] = strings.ToLower(params[i])
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}
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}
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return params
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}
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func generateQueryParams(filters *Filters, sortOrder, refreshInterval string) string {
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var hasParams bool
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var queryParams strings.Builder
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queryParams.WriteString("?")
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if Filter {
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queryParams.WriteString("include=")
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if filters.HasIncludes() {
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queryParams.WriteString(filters.GetIncludes())
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}
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queryParams.WriteString("&exclude=")
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if filters.HasExcludes() {
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queryParams.WriteString(filters.GetExcludes())
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}
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hasParams = true
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}
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if Sort {
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if hasParams {
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queryParams.WriteString("&")
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}
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queryParams.WriteString(fmt.Sprintf("sort=%v", sortOrder))
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hasParams = true
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}
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if hasParams {
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queryParams.WriteString("&")
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}
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queryParams.WriteString(fmt.Sprintf("refresh=%v", refreshInterval))
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return queryParams.String()
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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 string, dimensions *Dimensions, 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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refreshInterval := getRefreshInterval(r)
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sortOrder := getSortOrder(r)
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queryParams := generateQueryParams(filters, sortOrder, refreshInterval)
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var htmlBody strings.Builder
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htmlBody.WriteString(`<!DOCTYPE html><html lang="en"><head>`)
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htmlBody.WriteString(`<style>a{display:block;height:100%;width:100%;text-decoration:none;}`)
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htmlBody.WriteString(`img{max-width:100%;max-height:97vh;object-fit:contain;}</style>`)
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htmlBody.WriteString(fmt.Sprintf(`<title>%v (%vx%v)</title>`,
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fileName,
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dimensions.Width,
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dimensions.Height))
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htmlBody.WriteString(`</head><body>`)
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if refreshInterval != "0" {
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r, err := strconv.Atoi(refreshInterval)
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if err != nil {
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return err
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}
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refreshTimer := strconv.Itoa(r * 1000)
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htmlBody.WriteString(fmt.Sprintf("<script>window.onload = function(){setInterval(function(){window.location.href = '/%v';}, %v);};</script>",
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queryParams,
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refreshTimer))
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}
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htmlBody.WriteString(fmt.Sprintf(`<a href="/%v"><img src="%v" width="%v" height="%v" alt="Roulette selected: %v"></a>`,
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queryParams,
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generateFilePath(filePath),
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dimensions.Width,
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dimensions.Height,
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fileName))
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htmlBody.WriteString(`</body></html>`)
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_, err := io.WriteString(w, gohtml.Format(htmlBody.String()))
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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, filePath)
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return nil
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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, filePath)
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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) 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, regexes *Regexes, fileCache *[]string) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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refererUri, err := stripQueryParams(refererToUri(r.Referer()))
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if err != nil {
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log.Fatal(err)
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}
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filters := Filters{}
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filters.Includes = splitQueryParams(r.URL.Query().Get("include"), regexes)
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filters.Excludes = splitQueryParams(r.URL.Query().Get("exclude"), regexes)
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sortOrder := getSortOrder(r)
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refreshInterval := getRefreshInterval(r)
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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, regexes)
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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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if filePath == "" {
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filePath, err = getNewFile(paths, &filters, sortOrder, regexes, fileCache)
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switch {
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case err != nil && err == ErrNoImagesFound:
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notFound(w, r, filePath)
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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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}
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queryParams := generateQueryParams(&filters, sortOrder, refreshInterval)
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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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queryParams,
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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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log.Fatal(err)
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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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image, err := isImage(filePath)
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if err != nil {
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log.Fatal(err)
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}
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if !image {
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notFound(w, r, filePath)
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return
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}
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dimensions, err := getImageDimensions(filePath)
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if err != nil {
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log.Fatal(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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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 generateRegularExpressions() *Regexes {
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r := Regexes{}
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r.Filename = regexp.MustCompile(`(.+)([0-9]{3})(\..+)`)
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r.Alphanumeric = regexp.MustCompile(`^[a-zA-Z0-9]*$`)
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return &r
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}
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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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regexes := generateRegularExpressions()
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rand.Seed(time.Now().UnixNano())
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fileCache := []string{}
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http.Handle("/", serveHtmlHandler(paths, regexes, &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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