api/contentdb: properly detect mods at root folder

If the mod is packaged at the root folder, the
PackageArchive.FindFile() function would not find any
file. This commit fixes that issue with a reproducible
test case.

api/contentdb/archive.go

@@ -81,7 +81,7 @@ func (p *PackageArchive) Contents() []string {
 // are found.
 func (p *PackageArchive) FindFile(name string, max int) (count int, dir string) {
  for _, f := range p.Contents() {
- if strings.HasSuffix(f, "/"+name) {
+ if strings.HasSuffix(f, "/"+name) || f == name {
  dir, _ = path.Split(f)
  count++
  }

api/contentdb/archive_test.go

@@ -21,6 +21,9 @@ var (
  bytesTelegram []byte = mustReadFile("testdata/telegram.zip")
  zipTelegram *zip.Reader = mustZip(bytesTelegram)
 
+ bytesRespawn []byte = mustReadFile("testdata/respawn.zip")
+ zipRespawn *zip.Reader = mustZip(bytesRespawn)
+
  bytesNestedMod []byte = mustReadFile("testdata/nestedmod.zip")
  zipNestedMod *zip.Reader = mustZip(bytesNestedMod)
 
@@ -137,6 +140,11 @@ func TestPackageArchive_Type(t *testing.T) {
  fields: fields{b: bytes.NewBuffer(bytesInvalidModpack), z: zipInvalidModpack},
  want: Invalid,
  },
+ {
+ name: "should detect valid mod at the root of zip folder",
+ fields: fields{b: bytes.NewBuffer(bytesRespawn), z: zipRespawn},
+ want: Mod,
+ },
  }
  for _, tt := range tests {
  t.Run(tt.name, func(t *testing.T) {