Add torrentFileExists function, check if torrent file exists and if it doesn't lower the opacity on the torrent download button (#1504)

* Add torrentFileExists function

* If torrent file doesn't exist, put torrent download button opacity at 50%

* ditto for listing

* Forgot an if

* attempt at fixing travis by adding function into test templates

* Attempt at fixing travis by having sex with my own mother

* fix wrong error message

* Add torrentFileExists as global function

* Update template_functions.go

templates/site/torrents/listing.jet.html

@@ -87,11 +87,9 @@
           <a href="{{.Magnet}}" title="{{  T("magnet_link") }}">
             <div class="icon-magnet"></div>
           </a>
-          {{if .TorrentLink != ""}}
-          <a href="{{.TorrentLink}}" title="{{  T("torrent_file") }}">
+          <a href="{{.TorrentLink}}" title="{{  T("torrent_file") }}" {{if !torrentFileExists(.Hash)}}class="hidden"{{end}}>
             <div class="icon-floppy"></div>
           </a>
-          {{end}}
         </td>
         <td class="tr-size home-td hide-xs">
           {{ fileSize(.Filesize, T) }}

templates/site/torrents/view.jet.html

@@ -133,11 +133,9 @@
     <a href="{{Torrent.Magnet}}" class="form-input btn-green download" style="float:left;height: auto;margin-right: 0.5em;">
       <div class="icon-magnet"></div> {{ T("magnet_link")}}
     </a>
-    {{ if Torrent.TorrentLink != ""}}
-    <a href="{{Torrent.TorrentLink}}" class="form-input download" style="float:left;height: auto;">
+    <a href="{{Torrent.TorrentLink}}" class="form-input download{{ if !torrentFileExists(Torrent.Hash)}} hidden{{end}}" style="float:left;height: auto;">
       <div class="icon-floppy"></div> {{ T("torrent_file")}}
     </a>
-    {{end}}
     {{ if User.ID > 0}}
     <a id="reportPopup" href="#" class="form-input">{{  T("report_btn") }}</a>
     {{ if User.HasAdmin()}}

templates/template_functions.go

@@ -6,6 +6,8 @@ import (
 	"net/url"
 	"strconv"
 	"time"
+	"os"
+	"fmt"
 
 	"strings"
 
@@ -30,7 +32,7 @@ func templateFunctions(vars jet.VarMap) jet.VarMap {
 	vars.Set("getDefaultLanguage", publicSettings.GetDefaultLanguage)
 	vars.Set("FlagCode", flagCode)
 	vars.Set("getAvatar", getAvatar)
-
+	vars.Set("torrentFileExists", torrentFileExists)
 	vars.Set("formatDateRFC", formatDateRFC)
 	vars.Set("GetHostname", format.GetHostname)
 	vars.Set("GetCategories", categories.GetSelect)
@@ -292,3 +294,13 @@ func contains(arr interface{}, comp string) bool {
 	}
 	return false
 }
+
+func torrentFileExists(hash string) bool {
+ 
+	Openfile, err := os.Open(fmt.Sprintf("%s%c%s.torrent", config.Get().Torrents.FileStorage, os.PathSeparator, hash))
+	if err != nil {
+		return false
+	}
+	defer Openfile.Close()
+	return true
+}

templates/template_functions_test.go

@@ -588,6 +588,24 @@ func TestContains(t *testing.T) {
 	}
 }
 
+func testTorrentFileExists(t *testing.T) {
+	var tests = []struct {
+		hash 	     string
+		Expected     bool
+	}{
+		{
+			hash: "",
+			Expected: false,
+		},
+	}
+	for _, test := range tests {
+		value := torrentFileExists(test.hash)
+		if value != test.Expected {
+			t.Errorf("Unexpected value from the function TorrentFileExists, got  '%t', wanted '%t' for '%s'", value, test.Expected, test.hash)
+		}
+	}	
+}
+
 func mockupTemplateT(t *testing.T) publicSettings.TemplateTfunc {
 	conf := config.Get().I18n
 	conf.Directory = path.Join("..", conf.Directory)