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|
//
// rhimportd
//
// The Radio Helsinki Rivendell Import Daemon
//
//
// Copyright (C) 2015 Christian Pointner <equinox@helsinki.at>
//
// This file is part of rhimportd.
//
// rhimportd is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// any later version.
//
// rhimportd is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with rhimportd. If not, see <http://www.gnu.org/licenses/>.
//
package rhimport
import (
"crypto/rand"
"encoding/base64"
"fmt"
"net/http"
)
type newSessionResponse struct {
id string
session *SessionChan
responsecode int
errorstring string
}
type newSessionRequest struct {
ctx *ImportContext
response chan newSessionResponse
}
type getSessionResponse struct {
session *SessionChan
responsecode int
errorstring string
}
type getSessionRequest struct {
user string
id string
response chan getSessionResponse
}
type removeSessionResponse struct {
responsecode int
errorstring string
}
type removeSessionRequest struct {
user string
id string
response chan removeSessionResponse
}
type SessionStore struct {
store map[string]map[string]*Session
quit chan bool
done chan bool
newChan chan newSessionRequest
getChan chan getSessionRequest
removeChan chan removeSessionRequest
}
func generateSessionId() (string, error) {
var b [32]byte
if _, err := rand.Read(b[:]); err != nil {
return "", err
}
return base64.RawStdEncoding.EncodeToString(b[:]), nil
}
func (self *SessionStore) new(ctx *ImportContext) (resp newSessionResponse) {
resp.responsecode = http.StatusOK
resp.errorstring = "OK"
if !ctx.Trusted {
if ok, err := ctx.rddb.CheckPassword(ctx.UserName, ctx.Password); err != nil {
resp.responsecode = http.StatusInternalServerError
resp.errorstring = err.Error()
return
} else if !ok {
resp.responsecode = http.StatusUnauthorized
resp.errorstring = "invalid username and/or password"
return
}
}
if id, err := generateSessionId(); err != nil {
resp.responsecode = http.StatusInternalServerError
resp.errorstring = err.Error()
} else {
resp.id = id
if _, exists := self.store[ctx.UserName]; !exists {
self.store[ctx.UserName] = make(map[string]*Session)
}
self.store[ctx.UserName][resp.id] = NewSession(ctx, func() { self.GetInterface().Remove(ctx.UserName, resp.id) })
resp.session = self.store[ctx.UserName][resp.id].getInterface()
rhdl.Printf("SessionStore: created session for '%s' -> %s", ctx.UserName, resp.id)
}
return
}
func (self *SessionStore) get(user, id string) (resp getSessionResponse) {
resp.responsecode = http.StatusOK
resp.errorstring = "OK"
if session, exists := self.store[user][id]; exists {
resp.session = session.getInterface()
} else {
resp.responsecode = http.StatusNotFound
resp.errorstring = fmt.Sprintf("SessionStore: session '%s/%s' not found", user, id)
}
return
}
func (self *SessionStore) remove(user, id string) (resp removeSessionResponse) {
resp.responsecode = http.StatusOK
resp.errorstring = "OK"
if session, exists := self.store[user][id]; exists {
go session.Cleanup() // cleanup could take a while -> don't block all the other stuff
delete(self.store[user], id)
rhdl.Printf("SessionStore: removed session '%s/%s'", user, id)
if userstore, exists := self.store[user]; exists {
if len(userstore) == 0 {
delete(self.store, user)
rhdl.Printf("SessionStore: removed user '%s'", user)
}
}
} else {
resp.responsecode = http.StatusNotFound
resp.errorstring = fmt.Sprintf("SessionStore: session '%s/%s' not found", user, id)
}
return
}
func (self *SessionStore) dispatchRequests() {
defer func() { self.done <- true }()
for {
select {
case <-self.quit:
return
case req := <-self.newChan:
req.response <- self.new(req.ctx)
case req := <-self.getChan:
req.response <- self.get(req.user, req.id)
case req := <-self.removeChan:
req.response <- self.remove(req.user, req.id)
}
}
}
// *********************************************************
// Public Interface
type SessionStoreChan struct {
newChan chan<- newSessionRequest
getChan chan<- getSessionRequest
removeChan chan<- removeSessionRequest
}
func (self *SessionStoreChan) New(ctx *ImportContext) (string, *SessionChan, int, string) {
res_ch := make(chan newSessionResponse)
req := newSessionRequest{}
req.ctx = ctx
req.response = res_ch
self.newChan <- req
res := <-res_ch
return res.id, res.session, res.responsecode, res.errorstring
}
func (self *SessionStoreChan) Get(user, id string) (*SessionChan, int, string) {
res_ch := make(chan getSessionResponse)
req := getSessionRequest{}
req.user = user
req.id = id
req.response = res_ch
self.getChan <- req
res := <-res_ch
return res.session, res.responsecode, res.errorstring
}
func (self *SessionStoreChan) Remove(user, id string) (int, string) {
res_ch := make(chan removeSessionResponse)
req := removeSessionRequest{}
req.user = user
req.id = id
req.response = res_ch
self.removeChan <- req
res := <-res_ch
return res.responsecode, res.errorstring
}
func (self *SessionStore) GetInterface() *SessionStoreChan {
ch := &SessionStoreChan{}
ch.newChan = self.newChan
ch.getChan = self.getChan
ch.removeChan = self.removeChan
return ch
}
func (self *SessionStore) Cleanup() {
self.quit <- true
<-self.done
close(self.quit)
close(self.done)
close(self.newChan)
close(self.getChan)
close(self.removeChan)
}
func NewSessionStore(conf *Config) (store *SessionStore, err error) {
store = new(SessionStore)
store.quit = make(chan bool)
store.done = make(chan bool)
store.store = make(map[string]map[string]*Session)
store.newChan = make(chan newSessionRequest, 10)
store.getChan = make(chan getSessionRequest, 10)
store.removeChan = make(chan removeSessionRequest, 10)
go store.dispatchRequests()
return
}
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