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g1t/services/identity/src/tokens.rs

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Agents as a team: lifecycle, merge queue, billing and a new shell1//! Access tokens: the `g1t_…` secrets used by git, the API and the MCP
2//! server.
3//!
4//! There is one implementation and two kinds of owner. A personal token
5//! acts as the person who made it. A workspace's token belongs to the
6//! workspace and acts as it, so automation needs no account of its own and
7//! keeps working when the member who set it up leaves.
8
9use g1t_contracts::identity::*;
10use g1t_contracts::time::{SQL_NOW, rfc3339};
11use g1t_contracts::{FailureCode, Membership, Outcome, PrincipalKind, Role, User, Viewer, new_id};
12use g1t_kit::now_ms;
13use serde::Deserialize;
14use worker::Result;
15use worker::wasm_bindgen::JsValue;
16
17use crate::{Identity, crypto};
18
19pub const TOKEN_PREFIX: &str = "g1t_";
20/// How stale a token's last-used time may get before it is written again.
21const LAST_USED_RESOLUTION_MS: u64 = 5 * 60 * 1000;
22const MAX_TOKENS_PER_WORKSPACE: usize = 50;
23const WORKSPACE_ID_PREFIX: &str = "wsp_";
24
25const TOKEN_COLUMNS: &str = "access_tokens.id, access_tokens.name, access_tokens.created_at,
26 access_tokens.last_used_at, users.username AS created_by";
27
28/// Who a new token belongs to.
29enum Owner<'a> {
30 User(&'a str),
31 Workspace {
32 id: &'a str,
33 created_by: Option<&'a str>,
34 },
35}
36
37#[derive(Deserialize)]
38struct TokenRow {
39 id: String,
40 name: String,
41 created_at: String,
42 last_used_at: Option<String>,
43 created_by: Option<String>,
44}
45
46impl From<TokenRow> for AccessToken {
47 fn from(row: TokenRow) -> Self {
48 AccessToken {
49 id: row.id,
50 name: row.name,
51 created_at: row.created_at,
52 last_used_at: row.last_used_at,
53 created_by: row.created_by,
54 }
55 }
56}
57
58/// The owner of a token being used.
59#[derive(Deserialize)]
60struct Presented {
61 id: String,
62 user_id: Option<String>,
63 workspace_id: Option<String>,
64 last_used_at: Option<String>,
65 /// Set on an agent's token: what it may do, as JSON `AgentScope`.
66 agent_scope: Option<String>,
67}
68
69#[derive(Deserialize)]
70struct WorkspaceRef {
71 id: String,
72 slug: String,
73}
74
75fn text(value: Option<&str>) -> JsValue {
76 value.map_or(JsValue::NULL, JsValue::from)
77}
78
79impl Identity {
80 pub async fn user_for_access_token(&self, token: &str) -> Result<Viewer> {
81 if !token.starts_with(TOKEN_PREFIX) {
82 return Ok(None);
83 }
84 let Some(presented) = self
85 .db
86 .prepare(format!(
87 "SELECT id, user_id, workspace_id, last_used_at, agent_scope FROM access_tokens
88 WHERE token_hash = ? AND (expires_at IS NULL OR expires_at > {SQL_NOW})"
89 ))
90 .bind(&[crypto::sha256_hex(token).into()])?
91 .first::<Presented>(None)
92 .await?
93 else {
94 return Ok(None);
95 };
96 // An agent's token: g1t-agent, a member of its repository's
97 // workspace, and only for what its scope lists.
98 if let Some(scope) = presented
99 .agent_scope
100 .as_deref()
101 .and_then(|scope| serde_json::from_str::<AgentScope>(scope).ok())
102 {
103 return Ok(Some(User {
104 id: AGENT_ID.to_owned(),
105 username: AGENT_NAME.to_owned(),
106 kind: PrincipalKind::Agent,
107 verified: true,
Workspace names and icons, and a component kit for every control108 workspaces: vec![Membership::member(scope.repo.namespace)],
109 ..User::default()
Agents as a team: lifecycle, merge queue, billing and a new shell110 }));
111 }
112 let viewer = match (&presented.user_id, &presented.workspace_id) {
113 (Some(user_id), _) => {
114 self.find_user(
115 "SELECT id, username, email_verified_at IS NOT NULL AS verified
116 FROM users WHERE id = ?",
117 user_id,
118 )
119 .await?
120 }
121 (None, Some(workspace_id)) => self.workspace_principal(workspace_id).await?,
122 (None, None) => None,
123 };
124 if viewer.is_some() {
125 self.note_use(&presented).await?;
126 }
127 Ok(viewer)
128 }
129
130 /// A workspace as the actor behind one of its own tokens. It can do
131 /// what a member can, in that workspace only.
132 async fn workspace_principal(&self, workspace_id: &str) -> Result<Viewer> {
133 let workspace = self
134 .db
135 .prepare("SELECT id, slug FROM workspaces WHERE id = ?")
136 .bind(&[workspace_id.into()])?
137 .first::<WorkspaceRef>(None)
138 .await?;
139 Ok(workspace.map(|workspace| User {
140 id: workspace.id,
141 username: workspace.slug.clone(),
142 kind: PrincipalKind::Workspace,
143 verified: true,
Workspace names and icons, and a component kit for every control144 workspaces: vec![Membership::member(workspace.slug)],
145 ..User::default()
Agents as a team: lifecycle, merge queue, billing and a new shell146 }))
147 }
148
149 async fn note_use(&self, presented: &Presented) -> Result<()> {
150 let now = now_ms();
151 let stale = rfc3339(now.saturating_sub(LAST_USED_RESOLUTION_MS));
152 if presented
153 .last_used_at
154 .as_deref()
155 .is_some_and(|at| at >= stale.as_str())
156 {
157 return Ok(());
158 }
159 self.db
160 .prepare("UPDATE access_tokens SET last_used_at = ? WHERE id = ?")
161 .bind(&[rfc3339(now).into(), presented.id.as_str().into()])?
162 .run()
163 .await?;
164 Ok(())
165 }
166
167 async fn mint(
168 &self,
169 owner: Owner<'_>,
170 name: &str,
171 ttl_seconds: Option<u64>,
172 ) -> Result<CreatedAccessToken> {
173 let token = format!("{TOKEN_PREFIX}{}", crypto::random_hex(20));
174 let now = now_ms();
175 let name: String = match name.trim() {
176 "" => "Access token".to_owned(),
177 name => name.chars().take(100).collect(),
178 };
179 let (user_id, workspace_id, created_by) = match owner {
180 Owner::User(id) => (Some(id), None, Some(id)),
181 Owner::Workspace { id, created_by } => (None, Some(id), created_by),
182 };
183 let info = AccessToken {
184 id: new_id("tok", now),
185 name,
186 created_at: rfc3339(now),
187 last_used_at: None,
188 created_by: None,
189 };
190 self.db
191 .prepare(
192 "INSERT INTO access_tokens
193 (id, user_id, workspace_id, created_by, name, token_hash, created_at, expires_at)
194 VALUES (?, ?, ?, ?, ?, ?, ?, ?)",
195 )
196 .bind(&[
197 info.id.as_str().into(),
198 text(user_id),
199 text(workspace_id),
200 text(created_by),
201 info.name.as_str().into(),
202 crypto::sha256_hex(&token).into(),
203 info.created_at.as_str().into(),
204 ttl_seconds.map_or(JsValue::NULL, |ttl| rfc3339(now + ttl * 1000).into()),
205 ])?
206 .run()
207 .await?;
208 Ok(CreatedAccessToken { token, info })
209 }
210
211 pub async fn create_access_token(
212 &self,
213 a: CreateAccessTokenArgs,
214 ) -> Result<CreatedAccessToken> {
215 // Told apart by the id, which says what it names, since callers pass
216 // on actors that other services stored as an id and a name.
217 let owner = if a.user.id.starts_with(WORKSPACE_ID_PREFIX) {
218 Owner::Workspace {
219 id: &a.user.id,
220 created_by: None,
221 }
222 } else {
223 Owner::User(&a.user.id)
224 };
225 self.mint(owner, &a.name, a.ttl_seconds).await
226 }
227
228 /// A token for a g1t agent working for `on_behalf_of`, which can do
229 /// only what `scope` lists. It is recorded as theirs, so it is listed and
230 /// can be deleted with their other tokens.
231 pub async fn create_agent_token(&self, a: CreateAgentTokenArgs) -> Result<CreatedAccessToken> {
232 let created = self
233 .mint(
234 Owner::User(&a.on_behalf_of.id),
235 &format!("g1t agent in {}/{}", a.scope.repo.namespace, a.scope.repo.name),
236 Some(a.ttl_seconds),
237 )
238 .await?;
239 self.db
240 .prepare("UPDATE access_tokens SET agent_scope = ? WHERE id = ?")
241 .bind(&[
242 serde_json::to_string(&a.scope)?.into(),
243 created.info.id.as_str().into(),
244 ])?
245 .run()
246 .await?;
247 Ok(created)
248 }
249
250 /// What an agent's token may do, or `None` for any other token.
251 pub async fn agent_scope(&self, a: TokenArgs) -> Result<Option<AgentScope>> {
252 let scope: Option<Option<String>> = self
253 .db
254 .prepare(format!(
255 "SELECT agent_scope FROM access_tokens
256 WHERE token_hash = ? AND (expires_at IS NULL OR expires_at > {SQL_NOW})"
257 ))
258 .bind(&[crypto::sha256_hex(&a.token).into()])?
259 .first::<Option<String>>(Some("agent_scope"))
260 .await?;
261 Ok(scope
262 .flatten()
263 .and_then(|scope| serde_json::from_str(&scope).ok()))
264 }
265
266 pub async fn list_access_tokens(&self, a: UserArgs) -> Result<Vec<AccessToken>> {
267 self.tokens_where("access_tokens.user_id = ?", &a.user.id)
268 .await
269 }
270
271 /// Tokens that do not expire: the ones a person made on purpose, rather
272 /// than those issued to an application or a hosted agent.
273 async fn tokens_where(&self, owner: &str, id: &str) -> Result<Vec<AccessToken>> {
274 let rows = self
275 .db
276 .prepare(format!(
277 "SELECT {TOKEN_COLUMNS} FROM access_tokens
278 LEFT JOIN users ON users.id = access_tokens.created_by
279 WHERE {owner} AND access_tokens.expires_at IS NULL
280 ORDER BY access_tokens.id"
281 ))
282 .bind(&[id.into()])?
283 .all()
284 .await?
285 .results::<TokenRow>()?;
286 Ok(rows.into_iter().map(AccessToken::from).collect())
287 }
288
289 pub async fn list_workspace_tokens(
290 &self,
291 a: WorkspaceTokensArgs,
292 ) -> Result<Outcome<Vec<AccessToken>>> {
293 let slug = a.slug.to_lowercase();
294 if !a.viewer.is_some_and(|viewer| viewer.is_member(&slug)) {
295 return Ok(Outcome::fail(
296 FailureCode::Forbidden,
297 "Only members can see a workspace's access tokens.",
298 ));
299 }
300 let Some(workspace) = self.get_workspace(SlugArgs { slug }).await? else {
301 return Ok(Outcome::fail(FailureCode::NotFound, "Workspace not found."));
302 };
303 Ok(Outcome::Ok(
304 self.tokens_where("access_tokens.workspace_id = ?", &workspace.id)
305 .await?,
306 ))
307 }
308
309 /// The workspace's id, if `actor` is a person who owns it.
310 async fn owned_workspace(&self, actor: &User, slug: &str) -> Result<Outcome<String>> {
311 let slug = slug.to_lowercase();
312 if actor.kind != PrincipalKind::User || actor.role_in(&slug) != Some(Role::Owner) {
313 return Ok(Outcome::fail(
314 FailureCode::Forbidden,
315 "Only an owner can manage a workspace's access tokens.",
316 ));
317 }
318 Ok(match self.get_workspace(SlugArgs { slug }).await? {
319 Some(workspace) => Outcome::Ok(workspace.id),
320 None => Outcome::fail(FailureCode::NotFound, "Workspace not found."),
321 })
322 }
323
324 pub async fn create_workspace_token(
325 &self,
326 a: CreateWorkspaceTokenArgs,
327 ) -> Result<Outcome<CreatedAccessToken>> {
328 let workspace_id = match self.owned_workspace(&a.actor, &a.slug).await? {
329 Outcome::Ok(id) => id,
330 Outcome::Fail(failure) => return Ok(Outcome::Fail(failure)),
331 };
332 if a.name.trim().is_empty() {
333 return Ok(Outcome::fail(
334 FailureCode::Invalid,
335 "Name the token after what will use it.",
336 ));
337 }
338 let existing = self
339 .tokens_where("access_tokens.workspace_id = ?", &workspace_id)
340 .await?;
341 if existing.len() >= MAX_TOKENS_PER_WORKSPACE {
342 return Ok(Outcome::fail(
343 FailureCode::Conflict,
344 "This workspace has the maximum number of access tokens. Delete one first.",
345 ));
346 }
347 let mut created = self
348 .mint(
349 Owner::Workspace {
350 id: &workspace_id,
351 created_by: Some(&a.actor.id),
352 },
353 &a.name,
354 None,
355 )
356 .await?;
357 created.info.created_by = Some(a.actor.username);
358 Ok(Outcome::Ok(created))
359 }
360
361 pub async fn remove_workspace_token(
362 &self,
363 a: RemoveWorkspaceTokenArgs,
364 ) -> Result<Outcome<bool>> {
365 let workspace_id = match self.owned_workspace(&a.actor, &a.slug).await? {
366 Outcome::Ok(id) => id,
367 Outcome::Fail(failure) => return Ok(Outcome::Fail(failure)),
368 };
369 self.db
370 .prepare("DELETE FROM access_tokens WHERE id = ? AND workspace_id = ?")
371 .bind(&[a.id.into(), workspace_id.into()])?
372 .run()
373 .await?;
374 Ok(Outcome::Ok(true))
375 }
376}