MM-17912: Allow searching for files through plugin API (#13647)

* constants and options for getting files

* Method to get files with options

* Add i18n strings for en

* Add API methods for getting files with options

* gofmt -s file

* explicitly set create at in tests

* use greater than nanosecond time difference for tests

* use gte instead of gt for getting files by created time

* use created at time as default sort order for getting file infos

* use explicit inline strings instead of format strings

* join tables only when required

* use if as secondary sort, and update tests

* update field docs to reflect previous changes

* make page and perPage get options as required

* add json struct tags to GetFileOptions

* bump minimum server versioni

* remove sorting by username and channelname

* use bool for sort order type

* use FileInfo prefix instead of just File

* clearer comments

* use zero-based page numbering

* test filtering by user and channel

* remove unnecessary whitespace

* use int instead of uint for page and perPage arguments

Co-authored-by: mattermod <mattermod@users.noreply.github.com>

app/plugin_api_test.go

@@ -350,6 +350,94 @@ func TestPluginAPIGetFile(t *testing.T) {
 	require.Nil(t, data)
 }
 
+func TestPluginAPIGetFileInfos(t *testing.T) {
+	th := Setup(t).InitBasic()
+	defer th.TearDown()
+	api := th.SetupPluginAPI()
+
+	fileInfo1, err := th.App.DoUploadFile(
+		time.Date(2020, 1, 1, 1, 1, 1, 1, time.UTC),
+		th.BasicTeam.Id,
+		th.BasicChannel.Id,
+		th.BasicUser.Id,
+		"testFile1",
+		[]byte("testfile1 Content"),
+	)
+	require.Nil(t, err)
+	defer func() {
+		th.App.Srv.Store.FileInfo().PermanentDelete(fileInfo1.Id)
+		th.App.RemoveFile(fileInfo1.Path)
+	}()
+
+	fileInfo2, err := th.App.DoUploadFile(
+		time.Date(2020, 1, 2, 1, 1, 1, 1, time.UTC),
+		th.BasicTeam.Id,
+		th.BasicChannel.Id,
+		th.BasicUser2.Id,
+		"testFile2",
+		[]byte("testfile2 Content"),
+	)
+	require.Nil(t, err)
+	defer func() {
+		th.App.Srv.Store.FileInfo().PermanentDelete(fileInfo2.Id)
+		th.App.RemoveFile(fileInfo2.Path)
+	}()
+
+	fileInfo3, err := th.App.DoUploadFile(
+		time.Date(2020, 1, 3, 1, 1, 1, 1, time.UTC),
+		th.BasicTeam.Id,
+		th.BasicChannel.Id,
+		th.BasicUser.Id,
+		"testFile3",
+		[]byte("testfile3 Content"),
+	)
+	require.Nil(t, err)
+	defer func() {
+		th.App.Srv.Store.FileInfo().PermanentDelete(fileInfo3.Id)
+		th.App.RemoveFile(fileInfo3.Path)
+	}()
+
+	_, err = api.CreatePost(&model.Post{
+		Message:   "testFile1",
+		UserId:    th.BasicUser.Id,
+		ChannelId: th.BasicChannel.Id,
+		FileIds:   model.StringArray{fileInfo1.Id},
+	})
+	require.Nil(t, err)
+
+	_, err = api.CreatePost(&model.Post{
+		Message:   "testFile2",
+		UserId:    th.BasicUser2.Id,
+		ChannelId: th.BasicChannel.Id,
+		FileIds:   model.StringArray{fileInfo2.Id},
+	})
+	require.Nil(t, err)
+
+	t.Run("get file infos with no options 2nd page of 1 per page", func(t *testing.T) {
+		fileInfos, err := api.GetFileInfos(1, 1, nil)
+		require.Nil(t, err)
+		require.Len(t, fileInfos, 1)
+	})
+	t.Run("get file infos filtered by user", func(t *testing.T) {
+		fileInfos, err := api.GetFileInfos(0, 5, &model.GetFileInfosOptions{
+			UserIds: []string{th.BasicUser.Id},
+		})
+		require.Nil(t, err)
+		require.Len(t, fileInfos, 2)
+	})
+	t.Run("get file infos filtered by channel ordered by created at descending", func(t *testing.T) {
+		fileInfos, err := api.GetFileInfos(0, 5, &model.GetFileInfosOptions{
+			ChannelIds:     []string{th.BasicChannel.Id},
+			SortBy:         model.FILEINFO_SORT_BY_CREATED,
+			SortDescending: true,
+		})
+		require.Nil(t, err)
+		require.Len(t, fileInfos, 2)
+		require.Equal(t, fileInfos[0].Id, fileInfo2.Id)
+		require.Equal(t, fileInfos[1].Id, fileInfo1.Id)
+	})
+}
+
 func TestPluginAPISavePluginConfig(t *testing.T) {
 	th := Setup(t)
 	defer th.TearDown()