summaryrefslogtreecommitdiff
path: root/rhimport/session_store.go
blob: 85ea4c7f450db1120400c3e7c002c71cef74f249 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
//
//  rhimportd
//
//  The Radio Helsinki Rivendell Import Daemon
//
//
//  Copyright (C) 2015-2016 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 (
	"code.helsinki.at/rhrd-go/rddb"
	"crypto/rand"
	"encoding/base64"
	"fmt"
	"net/http"
)

type newSessionResponse struct {
	id           string
	session      *SessionChan
	responsecode int
	errorstring  string
}

type newSessionRequest struct {
	ctx      *Context
	refId    string
	response chan newSessionResponse
}

type getSessionResponse struct {
	session      *SessionChan
	refId        string
	responsecode int
	errorstring  string
}

type getSessionRequest struct {
	user     string
	id       string
	refId    string
	response chan getSessionResponse
}

type listSessionsResponse struct {
	sessions     map[string]string
	responsecode int
	errorstring  string
}

type listSessionsRequest struct {
	user     string
	password string
	trusted  bool
	response chan listSessionsResponse
}

type removeSessionResponse struct {
	responsecode int
	errorstring  string
}

type removeSessionRequest struct {
	user     string
	id       string
	response chan removeSessionResponse
}

type SessionStoreElement struct {
	s     *Session
	refId string
}

type SessionStore struct {
	store      map[string]map[string]*SessionStoreElement
	conf       *Config
	db         *rddb.DBChan
	quit       chan bool
	done       chan bool
	newChan    chan newSessionRequest
	getChan    chan getSessionRequest
	listChan   chan listSessionsRequest
	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 *Context, refId string) (resp newSessionResponse) {
	resp.responsecode = http.StatusOK
	resp.errorstring = "OK"
	if !ctx.Trusted {
		if ok, err := self.db.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]*SessionStoreElement)
		}
		ctx.conf = self.conf
		ctx.db = self.db
		s := &SessionStoreElement{newSession(ctx, func() { self.GetInterface().Remove(ctx.UserName, resp.id) }), refId}
		self.store[ctx.UserName][resp.id] = s
		resp.session = self.store[ctx.UserName][resp.id].s.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.s.getInterface()
		resp.refId = session.refId
	} else {
		resp.responsecode = http.StatusNotFound
		resp.errorstring = fmt.Sprintf("SessionStore: session '%s/%s' not found", user, id)
	}
	return
}

func (self *SessionStore) list(user, password string, trusted bool) (resp listSessionsResponse) {
	resp.responsecode = http.StatusOK
	resp.errorstring = "OK"
	if !trusted {
		if ok, err := self.db.CheckPassword(user, 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
		}
	}
	resp.sessions = make(map[string]string)
	if sessions, exists := self.store[user]; exists {
		for id, e := range sessions {
			resp.sessions[id] = e.refId
		}
	}
	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.s.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, req.refId)
		case req := <-self.getChan:
			req.response <- self.get(req.user, req.id)
		case req := <-self.listChan:
			req.response <- self.list(req.user, req.password, req.trusted)
		case req := <-self.removeChan:
			req.response <- self.remove(req.user, req.id)
		}
	}
}

// *********************************************************
// Public Interface

type SessionStoreChan struct {
	newChan    chan<- newSessionRequest
	getChan    chan<- getSessionRequest
	listChan   chan listSessionsRequest
	removeChan chan<- removeSessionRequest
}

func (self *SessionStoreChan) New(ctx *Context, refId string) (string, *SessionChan, int, string) {
	resCh := make(chan newSessionResponse)
	req := newSessionRequest{}
	req.ctx = ctx
	req.refId = refId
	req.response = resCh
	self.newChan <- req

	res := <-resCh
	return res.id, res.session, res.responsecode, res.errorstring
}

func (self *SessionStoreChan) Get(user, id string) (*SessionChan, string, int, string) {
	resCh := make(chan getSessionResponse)
	req := getSessionRequest{}
	req.user = user
	req.id = id
	req.response = resCh
	self.getChan <- req

	res := <-resCh
	return res.session, res.refId, res.responsecode, res.errorstring
}

func (self *SessionStoreChan) List(user, password string, trusted bool) (map[string]string, int, string) {
	resCh := make(chan listSessionsResponse)
	req := listSessionsRequest{}
	req.user = user
	req.password = password
	req.trusted = trusted
	req.response = resCh
	self.listChan <- req

	res := <-resCh
	return res.sessions, res.responsecode, res.errorstring
}

func (self *SessionStoreChan) Remove(user, id string) (int, string) {
	resCh := make(chan removeSessionResponse)
	req := removeSessionRequest{}
	req.user = user
	req.id = id
	req.response = resCh
	self.removeChan <- req

	res := <-resCh
	return res.responsecode, res.errorstring
}

func (self *SessionStore) GetInterface() *SessionStoreChan {
	ch := &SessionStoreChan{}
	ch.newChan = self.newChan
	ch.getChan = self.getChan
	ch.listChan = self.listChan
	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.listChan)
	close(self.removeChan)
}

func NewSessionStore(conf *Config, db *rddb.DBChan) (store *SessionStore, err error) {
	store = new(SessionStore)
	store.conf = conf
	store.db = db
	store.quit = make(chan bool)
	store.done = make(chan bool)
	store.store = make(map[string]map[string]*SessionStoreElement)
	store.newChan = make(chan newSessionRequest, 10)
	store.getChan = make(chan getSessionRequest, 10)
	store.listChan = make(chan listSessionsRequest, 10)
	store.removeChan = make(chan removeSessionRequest, 10)

	go store.dispatchRequests()
	return
}