Add the API for search files (#15605)

* Adding search files api

* Fixing golangci-lint

* Adding bulk-indexing and improving a bit the name indexing for bleve and elasticsearch

* Add content extraction config migration

* Fixing a problem with document extraction

* Unapplying certain changes moved to other PR

* Fixing tests

* Making extract content app migration a private method

* Addressing PR review comments

* Addressing PR review comments

* Adding feature flag

* Removing debug string

* Fixing imports

* Fixing linting errors

* Do not migrate the config if the feature flag is not enabled

* Fix tests

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

api4/file.go

@@ -60,6 +60,8 @@ func (api *API) InitFile() {
 	api.BaseRoutes.File.Handle("/preview", api.ApiSessionRequiredTrustRequester(getFilePreview)).Methods("GET")
 	api.BaseRoutes.File.Handle("/info", api.ApiSessionRequired(getFileInfo)).Methods("GET")
 
+	api.BaseRoutes.Team.Handle("/files/search", api.ApiSessionRequiredDisableWhenBusy(searchFiles)).Methods("POST")
+
 	api.BaseRoutes.PublicFile.Handle("", api.ApiHandler(getPublicFile)).Methods("GET")
 
 }
@@ -725,3 +727,76 @@ func writeFileResponse(filename string, contentType string, contentSize int64, l
 
 	http.ServeContent(w, r, filename, lastModification, fileReader)
 }
+
+func searchFiles(c *Context, w http.ResponseWriter, r *http.Request) {
+	c.RequireTeamId()
+	if c.Err != nil {
+		return
+	}
+
+	if !c.App.Config().FeatureFlags.FilesSearch {
+		c.Err = model.NewAppError("searchFiles", "api.post.search_files.not_implemented.app_error", nil, "", http.StatusNotImplemented)
+		return
+	}
+
+	if !c.App.SessionHasPermissionToTeam(*c.App.Session(), c.Params.TeamId, model.PERMISSION_VIEW_TEAM) {
+		c.SetPermissionError(model.PERMISSION_VIEW_TEAM)
+		return
+	}
+
+	params, jsonErr := model.SearchParameterFromJson(r.Body)
+	if jsonErr != nil {
+		c.Err = model.NewAppError("searchFiles", "api.post.search_files.invalid_body.app_error", nil, jsonErr.Error(), http.StatusBadRequest)
+		return
+	}
+
+	if params.Terms == nil || *params.Terms == "" {
+		c.SetInvalidParam("terms")
+		return
+	}
+	terms := *params.Terms
+
+	timeZoneOffset := 0
+	if params.TimeZoneOffset != nil {
+		timeZoneOffset = *params.TimeZoneOffset
+	}
+
+	isOrSearch := false
+	if params.IsOrSearch != nil {
+		isOrSearch = *params.IsOrSearch
+	}
+
+	page := 0
+	if params.Page != nil {
+		page = *params.Page
+	}
+
+	perPage := 60
+	if params.PerPage != nil {
+		perPage = *params.PerPage
+	}
+
+	includeDeletedChannels := false
+	if params.IncludeDeletedChannels != nil {
+		includeDeletedChannels = *params.IncludeDeletedChannels
+	}
+
+	startTime := time.Now()
+
+	results, err := c.App.SearchFilesInTeamForUser(terms, c.App.Session().UserId, c.Params.TeamId, isOrSearch, includeDeletedChannels, timeZoneOffset, page, perPage)
+
+	elapsedTime := float64(time.Since(startTime)) / float64(time.Second)
+	metrics := c.App.Metrics()
+	if metrics != nil {
+		metrics.IncrementFilesSearchCounter()
+		metrics.ObserveFilesSearchDuration(elapsedTime)
+	}
+
+	if err != nil {
+		c.Err = err
+		return
+	}
+
+	w.Header().Set("Cache-Control", "no-cache, no-store, must-revalidate")
+	w.Write([]byte(results.ToJson()))
+}