[MM-28422] Enable processing of import files through API (#16062)

* Implement unzip function

* Implement FileSize method

* Implement path rewriting for bulk import

* Small improvements

* Add ImportSettings to config

* Implement ListImports API endpoint

* Enable uploading import files

* Implement import process job

* Add missing license headers

* Address reviews

* Make path sanitization a bit smarter

* Clean path before calculating Dir

* [MM-30008] Add mmctl support for file imports (#16301)

* Add mmctl support for import files

* Improve test

* Remove unnecessary handlers

* Use th.TestForSystemAdminAndLocal

* Make nouser id a constant

api4/api.go

@@ -123,6 +123,8 @@ type Routes struct {
 	Groups         *mux.Router // 'api/v4/groups'
 
 	Cloud *mux.Router // 'api/v4/cloud'
+
+	Imports *mux.Router // 'api/v4/imports'
 }
 
 type API struct {
@@ -235,6 +237,8 @@ func Init(configservice configservice.ConfigService, globalOptionsFunc app.AppOp
 
 	api.BaseRoutes.Cloud = api.BaseRoutes.ApiRoot.PathPrefix("/cloud").Subrouter()
 
+	api.BaseRoutes.Imports = api.BaseRoutes.ApiRoot.PathPrefix("/imports").Subrouter()
+
 	api.InitUser()
 	api.InitBot()
 	api.InitTeam()
@@ -271,6 +275,7 @@ func Init(configservice configservice.ConfigService, globalOptionsFunc app.AppOp
 	api.InitGroup()
 	api.InitAction()
 	api.InitCloud()
+	api.InitImport()
 
 	root.Handle("/api/v4/{anything:.*}", http.HandlerFunc(api.Handle404))
 
@@ -335,6 +340,13 @@ func InitLocal(configservice configservice.ConfigService, globalOptionsFunc app.
 
 	api.BaseRoutes.Roles = api.BaseRoutes.ApiRoot.PathPrefix("/roles").Subrouter()
 
+	api.BaseRoutes.Uploads = api.BaseRoutes.ApiRoot.PathPrefix("/uploads").Subrouter()
+	api.BaseRoutes.Upload = api.BaseRoutes.Uploads.PathPrefix("/{upload_id:[A-Za-z0-9]+}").Subrouter()
+
+	api.BaseRoutes.Imports = api.BaseRoutes.ApiRoot.PathPrefix("/imports").Subrouter()
+
+	api.BaseRoutes.Jobs = api.BaseRoutes.ApiRoot.PathPrefix("/jobs").Subrouter()
+
 	api.InitUserLocal()
 	api.InitTeamLocal()
 	api.InitChannelLocal()
@@ -349,6 +361,9 @@ func InitLocal(configservice configservice.ConfigService, globalOptionsFunc app.
 	api.InitSystemLocal()
 	api.InitPostLocal()
 	api.InitRoleLocal()
+	api.InitUploadLocal()
+	api.InitImportLocal()
+	api.InitJobLocal()
 
 	root.Handle("/api/v4/{anything:.*}", http.HandlerFunc(api.Handle404))