github.com/hugh712/snapd@v0.0.0-20200910133618-1a99902bd583/daemon/api_snap_file.go (about) 1 // -*- Mode: Go; indent-tabs-mode: t -*- 2 3 /* 4 * Copyright (C) 2019 Canonical Ltd 5 * 6 * This program is free software: you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 3 as 8 * published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program. If not, see <http://www.gnu.org/licenses/>. 17 * 18 */ 19 20 package daemon 21 22 import ( 23 "net/http" 24 25 "github.com/snapcore/snapd/overlord/auth" 26 "github.com/snapcore/snapd/overlord/snapstate" 27 "github.com/snapcore/snapd/overlord/state" 28 "github.com/snapcore/snapd/snap" 29 ) 30 31 var snapFileCmd = &Command{ 32 Path: "/v2/snaps/{name}/file", 33 UserOK: true, 34 PolkitOK: "io.snapcraft.snapd.manage", 35 GET: getSnapFile, 36 } 37 38 func getSnapFile(c *Command, r *http.Request, user *auth.UserState) Response { 39 vars := muxVars(r) 40 name := vars["name"] 41 42 st := c.d.overlord.State() 43 st.Lock() 44 defer st.Unlock() 45 46 var snapst snapstate.SnapState 47 var info *snap.Info 48 err := snapstate.Get(st, name, &snapst) 49 if err == nil { 50 info, err = snapst.CurrentInfo() 51 } 52 switch err { 53 case nil: 54 // ok 55 case state.ErrNoState: 56 return SnapNotFound(name, err) 57 default: 58 return InternalError("cannot download file for snap %q: %v", name, err) 59 } 60 if !snapst.Active { 61 return BadRequest("cannot download file of inactive snap %q", name) 62 } 63 if snapst.TryMode { 64 return BadRequest("cannot download file for try-mode snap %q", name) 65 } 66 67 return fileResponse(info.MountFile()) 68 }