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Commit 8bc9824b authored by henry's avatar henry Committed by Pier Angelo Vendrame
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fixup! Lox integration 

Bug 42489: Add notifications to the Lox module.

We ensure changes to credentials pass through #changeCredentials to
check whether we should send a notification.
parent 677dab92
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toolkit/components/lox/Lox.sys.mjs
+ 119
− 51
View file @ 8bc9824b
......@@ -50,6 +50,24 @@ XPCOMUtils.defineLazyModuleGetters(lazy, {
handle_blockage_migration: "resource://gre/modules/lox_wasm.jsm",
});
export const LoxTopics = Object.freeze({
// Whenever the bridges *might* have changed.
// getBridges only uses #credentials, so this will only fire when it changes.
UpdateBridges: "lox:update-bridges",
// Whenever we gain a new upgrade or blockage event, or clear events.
UpdateEvents: "lox:update-events",
// Whenever the next unlock *might* have changed.
// getNextUnlock uses #credentials and #constants, sow ill fire when either
// value changes.
UpdateNextUnlock: "lox:update-next-unlock",
// Whenever the remaining invites *might* have changed.
// getRemainingInviteCount only uses #credentials, so will only fire when it
// changes.
UpdateRemainingInvites: "lox:update-remaining-invites",
// Whenever we generate a new invite.
NewInvite: "lox:new-invite",
});
export const LoxErrors = Object.freeze({
BadInvite: "BadInvite",
MissingCredential: "MissingCredential",
......@@ -92,7 +110,12 @@ class LoxImpl {
#pubKeys = null;
#encTable = null;
#constants = null;
#credentials = null;
/**
* The latest credentials for a given lox id.
*
* @type {Object<string, string>}
*/
#credentials = {};
/**
* The list of accumulated blockage or upgrade events.
*
......@@ -185,6 +208,56 @@ class LoxImpl {
);
}
/**
* Change some existing credentials for an ID to a new value.
*
* @param {string} loxId - The ID to change the credentials for.
* @param {string} newCredentials - The new credentials to set.
*/
#changeCredentials(loxId, newCredentials) {
// FIXME: Several async methods want to update the credentials, but they
// might race and conflict with each. tor-browser#42492
if (!newCredentials) {
// Avoid overwriting and losing our current credentials.
throw new LoxError(`Empty credentials being set for ${loxId}`);
}
if (!this.#credentials[loxId]) {
// Unexpected, but we still want to save the value to storage.
lazy.logger.warn(`Lox ID ${loxId} is missing existing credentials`);
}
this.#credentials[loxId] = newCredentials;
this.#store();
// NOTE: In principle we could determine within this module whether the
// bridges, remaining invites, or next unlock changes in value when
// switching credentials.
// However, this logic can be done by the topic observers, as needed. In
// particular, TorSettings.bridges.bridge_strings has its own logic
// determining whether its value has changed.
// Let TorSettings know about possibly new bridges.
Services.obs.notifyObservers(null, LoxTopics.UpdateBridges);
// Let UI know about changes.
Services.obs.notifyObservers(null, LoxTopics.UpdateRemainingInvites);
Services.obs.notifyObservers(null, LoxTopics.UpdateNextUnlock);
}
/**
* Fetch the latest credentials.
*
* @param {string} loxId - The ID to get the credentials for.
*
* @returns {string} - The credentials.
*/
#getCredentials(loxId) {
const cred = loxId ? this.#credentials[loxId] : undefined;
if (!cred) {
throw new LoxError(LoxErrors.MissingCredential);
}
return cred;
}
/**
* Formats and returns bridges from the stored Lox credential.
*
......@@ -197,16 +270,9 @@ class LoxImpl {
if (!this.#initialized) {
throw new LoxError(LoxErrors.NotInitialized);
}
if (loxId === null) {
return [];
}
if (!this.#credentials[loxId]) {
// This lox id doesn't correspond to a stored credential
throw new LoxError(LoxErrors.MissingCredential);
}
// Note: this is messy now but can be mostly removed after we have
// https://gitlab.torproject.org/tpo/anti-censorship/lox/-/issues/46
let bridgelines = JSON.parse(this.#credentials[loxId]).bridgelines;
let bridgelines = JSON.parse(this.#getCredentials(loxId)).bridgelines;
let bridges = [];
for (const bridge of bridgelines) {
let addr = bridge.addr;
......@@ -278,7 +344,7 @@ class LoxImpl {
#load() {
const cred = Services.prefs.getStringPref(LoxSettingsPrefs.credentials, "");
this.#credentials = cred !== "" ? JSON.parse(cred) : {};
this.#credentials = cred ? JSON.parse(cred) : {};
const invites = Services.prefs.getStringPref(LoxSettingsPrefs.invites, "");
this.#invites = invites ? JSON.parse(invites) : [];
const events = Services.prefs.getStringPref(LoxSettingsPrefs.events, "");
......@@ -336,8 +402,12 @@ class LoxImpl {
// Try to update first, but if that doesn't work fall back to stored data
this.#constantsPromise = this.#makeRequest("constants", [])
.then(constants => {
const prevValue = this.#constants;
this.#constants = JSON.stringify(constants);
this.#store();
if (prevValue !== this.#constants) {
Services.obs.notifyObservers(null, LoxTopics.UpdateNextUnlock);
}
})
.catch(() => {
if (!this.#constants) {
......@@ -357,6 +427,7 @@ class LoxImpl {
if (!this.#initialized) {
throw new LoxError(LoxErrors.NotInitialized);
}
let addedEvent = false;
// Only run background tasks for the active lox ID.
const loxId = this.#activeLoxId;
if (!loxId) {
......@@ -366,13 +437,14 @@ class LoxImpl {
try {
const levelup = await this.#attemptUpgrade(loxId);
if (levelup) {
const level = lazy.get_trust_level(this.#credentials[loxId]);
const level = lazy.get_trust_level(this.#getCredentials(loxId));
const newEvent = {
type: "levelup",
newlevel: level,
};
this.#events.push(newEvent);
this.#store();
addedEvent = true;
}
} catch (err) {
lazy.logger.error(err);
......@@ -380,17 +452,21 @@ class LoxImpl {
try {
const leveldown = await this.#blockageMigration(loxId);
if (leveldown) {
let level = lazy.get_trust_level(this.#credentials[loxId]);
let level = lazy.get_trust_level(this.#getCredentials(loxId));
const newEvent = {
type: "blockage",
newlevel: level,
};
this.#events.push(newEvent);
this.#store();
addedEvent = true;
}
} catch (err) {
lazy.logger.error(err);
}
if (addedEvent) {
Services.obs.notifyObservers(null, LoxTopics.UpdateEvents);
}
}
/**
......@@ -438,7 +514,7 @@ class LoxImpl {
this.#pubKeyPromise = null;
this.#encTablePromise = null;
this.#constantsPromise = null;
this.#credentials = null;
this.#credentials = {};
this.#events = [];
if (this.#backgroundInterval) {
clearInterval(this.#backgroundInterval);
......@@ -545,17 +621,14 @@ class LoxImpl {
if (!this.#initialized) {
throw new LoxError(LoxErrors.NotInitialized);
}
if (!this.#credentials[loxId]) {
throw new LoxError(LoxErrors.MissingCredential);
}
await this.#getPubKeys();
await this.#getEncTable();
let level = lazy.get_trust_level(this.#credentials[loxId]);
let level = lazy.get_trust_level(this.#getCredentials(loxId));
if (level < 1) {
throw new LoxError(LoxErrors.NoInvitations);
}
let request = lazy.issue_invite(
JSON.stringify(this.#credentials[loxId]),
JSON.stringify(this.#getCredentials(loxId)),
this.#encTable,
this.#pubKeys
);
......@@ -572,13 +645,17 @@ class LoxImpl {
lazy.logger.error(response.error);
throw new LoxError(LoxErrors.NoInvitations);
} else {
this.#credentials[loxId] = response;
const invite = lazy.prepare_invite(response);
this.#invites.push(invite);
// cap length of stored invites
if (this.#invites.len > 50) {
this.#invites.shift();
}
this.#store();
this.#changeCredentials(loxId, response);
Services.obs.notifyObservers(null, LoxTopics.NewInvite);
// Return a copy.
// Right now invite is just a string, but that might change in the future.
return structuredClone(invite);
}
}
......@@ -594,20 +671,14 @@ class LoxImpl {
if (!this.#initialized) {
throw new LoxError(LoxErrors.NotInitialized);
}
if (!this.#credentials[loxId]) {
throw new LoxError(LoxErrors.MissingCredential);
}
return parseInt(lazy.get_invites_remaining(this.#credentials[loxId]));
return parseInt(lazy.get_invites_remaining(this.#getCredentials(loxId)));
}
async #blockageMigration(loxId) {
if (!loxId || !this.#credentials[loxId]) {
throw new LoxError(LoxErrors.MissingCredential);
}
await this.#getPubKeys();
let request;
try {
request = lazy.check_blockage(this.#credentials[loxId], this.#pubKeys);
request = lazy.check_blockage(this.#getCredentials(loxId), this.#pubKeys);
} catch {
lazy.logger.log("Not ready for blockage migration");
return false;
......@@ -618,11 +689,11 @@ class LoxImpl {
throw new LoxError(LoxErrors.LoxServerUnreachable);
}
const migrationCred = lazy.handle_check_blockage(
this.#credentials[loxId],
this.#getCredentials(loxId),
JSON.stringify(response)
);
request = lazy.blockage_migration(
this.#credentials[loxId],
this.#getCredentials(loxId),
migrationCred,
this.#pubKeys
);
......@@ -632,12 +703,11 @@ class LoxImpl {
throw new LoxError(LoxErrors.LoxServerUnreachable);
}
const cred = lazy.handle_blockage_migration(
this.#credentials[loxId],
this.#getCredentials(loxId),
JSON.stringify(response),
this.#pubKeys
);
this.#credentials[loxId] = cred;
this.#store();
this.#changeCredentials(loxId, cred);
return true;
}
......@@ -647,14 +717,11 @@ class LoxImpl {
* @returns {boolean} whether a levelup event occured
*/
async #attemptUpgrade(loxId) {
if (!loxId || !this.#credentials[loxId]) {
throw new LoxError(LoxErrors.MissingCredential);
}
await this.#getPubKeys();
await this.#getEncTable();
await this.#getConstants();
let success = false;
let level = lazy.get_trust_level(this.#credentials[loxId]);
let level = lazy.get_trust_level(this.#getCredentials(loxId));
if (level < 1) {
// attempt trust promotion instead
try {
......@@ -665,7 +732,7 @@ class LoxImpl {
}
} else {
let request = lazy.level_up(
this.#credentials[loxId],
this.#getCredentials(loxId),
this.#encTable,
this.#pubKeys
);
......@@ -679,7 +746,7 @@ class LoxImpl {
JSON.stringify(response),
this.#pubKeys
);
this.#credentials[loxId] = cred;
this.#changeCredentials(loxId, cred);
return true;
}
return success;
......@@ -697,7 +764,10 @@ class LoxImpl {
return new Promise((resolve, reject) => {
let request = "";
try {
request = lazy.trust_promotion(this.#credentials[loxId], this.#pubKeys);
request = lazy.trust_promotion(
this.#getCredentials(loxId),
this.#pubKeys
);
} catch (err) {
lazy.logger.debug("Not ready to upgrade");
resolve(false);
......@@ -715,7 +785,7 @@ class LoxImpl {
);
lazy.logger.debug("Formatted promotion cred");
request = lazy.trust_migration(
this.#credentials[loxId],
this.#getCredentials(loxId),
promoCred,
this.#pubKeys
);
......@@ -731,8 +801,7 @@ class LoxImpl {
}
lazy.logger.debug("Got new credential");
let cred = lazy.handle_trust_migration(request, response);
this.#credentials[loxId] = cred;
this.#store();
this.#changeCredentials(loxId, cred);
resolve(true);
})
.catch(err => {
......@@ -801,6 +870,7 @@ class LoxImpl {
}
this.#events = [];
this.#store();
Services.obs.notifyObservers(null, LoxTopics.UpdateEvents);
}
/**
......@@ -815,6 +885,8 @@ class LoxImpl {
/**
* Get details about the next feature unlock.
*
* NOTE: A call to this method may trigger LoxTopics.UpdateNextUnlock.
*
* @param {string} loxId - The ID to get the unlock for.
* @returns {UnlockData} - Details about the next unlock.
*/
......@@ -822,19 +894,15 @@ class LoxImpl {
if (!this.#initialized) {
throw new LoxError(LoxErrors.NotInitialized);
}
if (!this.#credentials[loxId]) {
throw new LoxError(LoxErrors.MissingCredential);
}
await this.#getConstants();
let nextUnlocks = JSON.parse(
lazy.get_next_unlock(this.#constants, this.#credentials[loxId])
let nextUnlock = JSON.parse(
lazy.get_next_unlock(this.#constants, this.#getCredentials(loxId))
);
const level = parseInt(lazy.get_trust_level(this.#credentials[loxId]));
const unlocks = {
date: nextUnlocks.trust_level_unlock_date,
const level = parseInt(lazy.get_trust_level(this.#getCredentials(loxId)));
return {
date: nextUnlock.trust_level_unlock_date,
nextLevel: level + 1,
};
return unlocks;
}
async #makeRequest(procedure, args) {
......
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