kot.pink
1package oauth
2
3import (
4 "errors"
5 "fmt"
6 "log/slog"
7 "net/http"
8 "time"
9
10 comatproto "github.com/bluesky-social/indigo/api/atproto"
11 "github.com/bluesky-social/indigo/atproto/auth/oauth"
12 atpclient "github.com/bluesky-social/indigo/atproto/client"
13 atcrypto "github.com/bluesky-social/indigo/atproto/crypto"
14 "github.com/bluesky-social/indigo/atproto/syntax"
15 xrpc "github.com/bluesky-social/indigo/xrpc"
16 "github.com/gorilla/sessions"
17 "github.com/posthog/posthog-go"
18 "tangled.org/core/appview/config"
19 "tangled.org/core/appview/db"
20 "tangled.org/core/idresolver"
21 "tangled.org/core/rbac"
22)
23
24type OAuth struct {
25 ClientApp *oauth.ClientApp
26 SessStore *sessions.CookieStore
27 Config *config.Config
28 JwksUri string
29 ClientName string
30 ClientUri string
31 Posthog posthog.Client
32 Db *db.DB
33 Enforcer *rbac.Enforcer
34 IdResolver *idresolver.Resolver
35 Logger *slog.Logger
36}
37
38func New(config *config.Config, ph posthog.Client, db *db.DB, enforcer *rbac.Enforcer, res *idresolver.Resolver, logger *slog.Logger) (*OAuth, error) {
39 var oauthConfig oauth.ClientConfig
40 var clientUri string
41 if config.Core.Dev {
42 clientUri = "http://127.0.0.1:3000"
43 callbackUri := clientUri + "/oauth/callback"
44 oauthConfig = oauth.NewLocalhostConfig(callbackUri, []string{"atproto", "transition:generic"})
45 } else {
46 clientUri = config.Core.AppviewHost
47 clientId := fmt.Sprintf("%s/oauth/client-metadata.json", clientUri)
48 callbackUri := clientUri + "/oauth/callback"
49 oauthConfig = oauth.NewPublicConfig(clientId, callbackUri, []string{"atproto", "transition:generic"})
50 }
51
52 // configure client secret
53 priv, err := atcrypto.ParsePrivateMultibase(config.OAuth.ClientSecret)
54 if err != nil {
55 return nil, err
56 }
57 if err := oauthConfig.SetClientSecret(priv, config.OAuth.ClientKid); err != nil {
58 return nil, err
59 }
60
61 jwksUri := clientUri + "/oauth/jwks.json"
62
63 authStore, err := NewRedisStore(&RedisStoreConfig{
64 RedisURL: config.Redis.ToURL(),
65 SessionExpiryDuration: time.Hour * 24 * 90,
66 SessionInactivityDuration: time.Hour * 24 * 14,
67 AuthRequestExpiryDuration: time.Minute * 30,
68 })
69 if err != nil {
70 return nil, err
71 }
72
73 sessStore := sessions.NewCookieStore([]byte(config.Core.CookieSecret))
74
75 clientApp := oauth.NewClientApp(&oauthConfig, authStore)
76 clientApp.Dir = res.Directory()
77
78 clientName := config.Core.AppviewName
79
80 return &OAuth{
81 ClientApp: clientApp,
82 Config: config,
83 SessStore: sessStore,
84 JwksUri: jwksUri,
85 ClientName: clientName,
86 ClientUri: clientUri,
87 Posthog: ph,
88 Db: db,
89 Enforcer: enforcer,
90 IdResolver: res,
91 Logger: logger,
92 }, nil
93}
94
95func (o *OAuth) SaveSession(w http.ResponseWriter, r *http.Request, sessData *oauth.ClientSessionData) error {
96 // first we save the did in the user session
97 userSession, err := o.SessStore.Get(r, SessionName)
98 if err != nil {
99 return err
100 }
101
102 userSession.Values[SessionDid] = sessData.AccountDID.String()
103 userSession.Values[SessionPds] = sessData.HostURL
104 userSession.Values[SessionId] = sessData.SessionID
105 userSession.Values[SessionAuthenticated] = true
106 return userSession.Save(r, w)
107}
108
109func (o *OAuth) ResumeSession(r *http.Request) (*oauth.ClientSession, error) {
110 userSession, err := o.SessStore.Get(r, SessionName)
111 if err != nil {
112 return nil, fmt.Errorf("error getting user session: %w", err)
113 }
114 if userSession.IsNew {
115 return nil, fmt.Errorf("no session available for user")
116 }
117
118 d := userSession.Values[SessionDid].(string)
119 sessDid, err := syntax.ParseDID(d)
120 if err != nil {
121 return nil, fmt.Errorf("malformed DID in session cookie '%s': %w", d, err)
122 }
123
124 sessId := userSession.Values[SessionId].(string)
125
126 clientSess, err := o.ClientApp.ResumeSession(r.Context(), sessDid, sessId)
127 if err != nil {
128 return nil, fmt.Errorf("failed to resume session: %w", err)
129 }
130
131 return clientSess, nil
132}
133
134func (o *OAuth) DeleteSession(w http.ResponseWriter, r *http.Request) error {
135 userSession, err := o.SessStore.Get(r, SessionName)
136 if err != nil {
137 return fmt.Errorf("error getting user session: %w", err)
138 }
139 if userSession.IsNew {
140 return fmt.Errorf("no session available for user")
141 }
142
143 d := userSession.Values[SessionDid].(string)
144 sessDid, err := syntax.ParseDID(d)
145 if err != nil {
146 return fmt.Errorf("malformed DID in session cookie '%s': %w", d, err)
147 }
148
149 sessId := userSession.Values[SessionId].(string)
150
151 // delete the session
152 err1 := o.ClientApp.Logout(r.Context(), sessDid, sessId)
153
154 // remove the cookie
155 userSession.Options.MaxAge = -1
156 err2 := o.SessStore.Save(r, w, userSession)
157
158 return errors.Join(err1, err2)
159}
160
161type User struct {
162 Did string
163 Pds string
164}
165
166func (o *OAuth) GetUser(r *http.Request) *User {
167 sess, err := o.ResumeSession(r)
168 if err != nil {
169 return nil
170 }
171
172 return &User{
173 Did: sess.Data.AccountDID.String(),
174 Pds: sess.Data.HostURL,
175 }
176}
177
178func (o *OAuth) GetDid(r *http.Request) string {
179 if u := o.GetUser(r); u != nil {
180 return u.Did
181 }
182
183 return ""
184}
185
186func (o *OAuth) AuthorizedClient(r *http.Request) (*atpclient.APIClient, error) {
187 session, err := o.ResumeSession(r)
188 if err != nil {
189 return nil, fmt.Errorf("error getting session: %w", err)
190 }
191 return session.APIClient(), nil
192}
193
194// this is a higher level abstraction on ServerGetServiceAuth
195type ServiceClientOpts struct {
196 service string
197 exp int64
198 lxm string
199 dev bool
200}
201
202type ServiceClientOpt func(*ServiceClientOpts)
203
204func WithService(service string) ServiceClientOpt {
205 return func(s *ServiceClientOpts) {
206 s.service = service
207 }
208}
209
210// Specify the Duration in seconds for the expiry of this token
211//
212// The time of expiry is calculated as time.Now().Unix() + exp
213func WithExp(exp int64) ServiceClientOpt {
214 return func(s *ServiceClientOpts) {
215 s.exp = time.Now().Unix() + exp
216 }
217}
218
219func WithLxm(lxm string) ServiceClientOpt {
220 return func(s *ServiceClientOpts) {
221 s.lxm = lxm
222 }
223}
224
225func WithDev(dev bool) ServiceClientOpt {
226 return func(s *ServiceClientOpts) {
227 s.dev = dev
228 }
229}
230
231func (s *ServiceClientOpts) Audience() string {
232 return fmt.Sprintf("did:web:%s", s.service)
233}
234
235func (s *ServiceClientOpts) Host() string {
236 scheme := "https://"
237 if s.dev {
238 scheme = "http://"
239 }
240
241 return scheme + s.service
242}
243
244func (o *OAuth) ServiceClient(r *http.Request, os ...ServiceClientOpt) (*xrpc.Client, error) {
245 opts := ServiceClientOpts{}
246 for _, o := range os {
247 o(&opts)
248 }
249
250 client, err := o.AuthorizedClient(r)
251 if err != nil {
252 return nil, err
253 }
254
255 // force expiry to atleast 60 seconds in the future
256 sixty := time.Now().Unix() + 60
257 if opts.exp < sixty {
258 opts.exp = sixty
259 }
260
261 resp, err := comatproto.ServerGetServiceAuth(r.Context(), client, opts.Audience(), opts.exp, opts.lxm)
262 if err != nil {
263 return nil, err
264 }
265
266 return &xrpc.Client{
267 Auth: &xrpc.AuthInfo{
268 AccessJwt: resp.Token,
269 },
270 Host: opts.Host(),
271 Client: &http.Client{
272 Timeout: time.Second * 5,
273 },
274 }, nil
275}