server/tv_rename.go

   1 //
   2 // Armadillo File Manager
   3 // Copyright (c) 2011-2012, Robert Sesek <http://www.bluestatic.org>
   4 //
   5 // This program is free software: you can redistribute it and/or modify it under
   6 // the terms of the GNU General Public License as published by the Free Software
   7 // Foundation, either version 3 of the License, or any later version.
   8 //
   9
  10 package server
  11
  12 import (
  13         "bufio"
  14         "errors"
  15         "fmt"
  16         "io"
  17         "net"
  18         "net/http"
  19         "net/http/httputil"
  20         "net/url"
  21         "path"
  22         "regexp"
  23         "strconv"
  24         "strings"
  25 )
  26
  27 // Takes a full file path and renames the last path component as if it were a
  28 // TV episode. This performs the actual rename as well.
  29 func RenameTVEpisode(inPath string) (*string, error) {
  30         // Parse the filename into its components.
  31         dirName, fileName := path.Split(inPath)
  32         info := parseEpisodeName(fileName)
  33         if info == nil {
  34                 return nil, errors.New("Could not parse file name")
  35         }
  36
  37         // Create the URL and perform the lookup.
  38         queryURL := buildURL(info)
  39         response, err := performLookup(queryURL)
  40         if err != nil {
  41                 return nil, err
  42         }
  43
  44         // Parse the response into the fullEpisodeInfo struct.
  45         fullInfo := parseResponse(response)
  46
  47         // Create the new path.
  48         newName := fmt.Sprintf("%s - %dx%02d - %s", fullInfo.episode.showName,
  49                 fullInfo.episode.season, fullInfo.episode.episode, fullInfo.episodeName)
  50         newName = strings.Replace(newName, "/", "_", -1)
  51         newName += path.Ext(fileName)
  52         newPath := path.Join(dirName, newName)
  53
  54         return &newPath, nil
  55 }
  56
  57 type episodeInfo struct {
  58         showName string
  59         season   int
  60         episode  int
  61 }
  62
  63 type fullEpisodeInfo struct {
  64         episode     episodeInfo
  65         episodeName string
  66 }
  67
  68 // Parses the last path component into a the component structure.
  69 func parseEpisodeName(name string) *episodeInfo {
  70         regex := regexp.MustCompile("(.+)( |\\.)[sS]?([0-9]+)[xeXE]([0-9]+)")
  71         matches := regex.FindAllStringSubmatch(name, -1)
  72         if len(matches) < 1 || len(matches[0]) < 4 {
  73                 return nil
  74         }
  75
  76         // Convert the season and episode numbers to integers.
  77         season, episode := convertEpisode(matches[0][3], matches[0][4])
  78         if season == 0 && season == episode {
  79                 return nil
  80         }
  81
  82         // If the separator between the show title and episode is a period, then
  83         // it's likely of the form "some.show.name.s03e06.720p.blah.mkv", so strip the
  84         // periods in the title.
  85         var showName string = matches[0][1]
  86         if matches[0][2] == "." {
  87                 showName = strings.Replace(matches[0][1], ".", " ", -1)
  88         }
  89
  90         return &episodeInfo{
  91                 showName,
  92                 season,
  93                 episode,
  94         }
  95 }
  96
  97 // Builds the URL to which we send a HTTP request to get the episode name.
  98 func buildURL(info *episodeInfo) string {
  99         return fmt.Sprintf("http://services.tvrage.com/tools/quickinfo.php?show=%s&ep=%dx%d",
 100                 url.QueryEscape(info.showName), info.season, info.episode)
 101 }
 102
 103 // Converts a season and episode to integers. If the return values are both 0,
 104 // an error occurred.
 105 func convertEpisode(season string, episode string) (int, int) {
 106         seasonInt, err := strconv.Atoi(season)
 107         if err != nil {
 108                 return 0, 0
 109         }
 110         episodeInt, err := strconv.Atoi(episode)
 111         if err != nil {
 112                 return 0, 0
 113         }
 114         return seasonInt, episodeInt
 115 }
 116
 117 // Performs the actual lookup and returns the HTTP response.
 118 func performLookup(urlString string) (*http.Response, error) {
 119         url_, err := url.Parse(urlString)
 120         if err != nil {
 121                 return nil, err
 122         }
 123
 124         // Open a TCP connection.
 125         conn, err := net.Dial("tcp", url_.Host+":"+url_.Scheme)
 126         if err != nil {
 127                 return nil, err
 128         }
 129
 130         // Perform the HTTP request.
 131         client := httputil.NewClientConn(conn, nil)
 132         request, err := http.NewRequest("GET", urlString, nil)
 133         if err != nil {
 134                 return nil, err
 135         }
 136         request.Header.Set("User-Agent", "Armadillo File Manager")
 137         err = client.Write(request)
 138         if err != nil {
 139                 return nil, err
 140         }
 141         return client.Read(request)
 142 }
 143
 144 // Parses the HTTP response from performLookup().
 145 func parseResponse(response *http.Response) *fullEpisodeInfo {
 146         var err error
 147         var line string
 148         var info fullEpisodeInfo
 149
 150         buf := bufio.NewReader(response.Body)
 151         for ; err != io.EOF; line, err = buf.ReadString('\n') {
 152                 // An error ocurred while reading.
 153                 if err != nil {
 154                         return nil
 155                 }
 156                 var parts []string = strings.SplitN(line, "@", 2)
 157                 if len(parts) != 2 {
 158                         continue
 159                 }
 160                 switch parts[0] {
 161                 case "Show Name":
 162                         info.episode.showName = strings.TrimSpace(parts[1])
 163                 case "Episode Info":
 164                         // Split the line, which is of the form: |SxE^Name^AirDate|.
 165                         parts = strings.SplitN(parts[1], "^", 3)
 166                         info.episodeName = parts[1]
 167                         // Split the episode string.
 168                         episode := strings.SplitN(parts[0], "x", 2)
 169                         info.episode.season, info.episode.episode = convertEpisode(episode[0], episode[1])
 170                         if info.episode.season == 0 && info.episode.season == info.episode.episode {
 171                                 return nil
 172                         }
 173                 }
 174         }
 175         return &info
 176 }