350 lines
12 KiB
Rust
350 lines
12 KiB
Rust
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// User behavior in simulation
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use crate::{
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get_date, negative_report::NegativeReport, positive_report::PositiveReport,
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simulation::state::State, BridgeDistributor,
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};
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use lox_cli::{networking::*, *};
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use lox_library::{
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bridge_table::{BridgeLine, MAX_BRIDGES_PER_BUCKET},
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cred::{Invitation, Lox},
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proto::check_blockage::MIN_TRUST_LEVEL,
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scalar_u32, IssuerPubKey,
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};
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use rand::Rng;
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pub struct User {
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// Does this user cooperate with a censor?
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censor: bool,
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// 2-character country code
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country: String,
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// The user always has a primary credential. If this credential's bucket is
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// blocked, the user may replace it or temporarily hold two credentials
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// while waiting to migrate from the primary credential.
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primary_cred: Lox,
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secondary_cred: Option<Lox>,
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// Does the user submit reports to Troll Patrol?
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submits_reports: bool,
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}
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impl User {
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pub async fn new(state: &State) -> Self {
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let (cred, bl) = get_lox_credential(
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&state.net,
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&get_open_invitation(&state.net).await,
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get_lox_pub(&state.la_pubkeys),
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)
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.await;
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// Probabilistically decide whether this user cooperates with a censor
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let mut rng = rand::thread_rng();
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let num: f64 = rng.gen_range(0.0..1.0);
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let censor = num < state.prob_user_is_censor;
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// Probabilistically decide whether this user submits reports
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let num: f64 = rng.gen_range(0.0..1.0);
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let submits_reports = num < state.prob_user_submits_reports;
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// Probabilistically decide user's country
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let num: f64 = rng.gen_range(0.0..1.0);
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let cc = {
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let mut cc = String::default();
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for (country, prob) in &state.probs_user_in_country {
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let mut prob = *prob;
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if prob < num {
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cc = country.to_string();
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break;
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} else {
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prob -= num;
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}
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}
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cc
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};
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Self {
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censor: censor,
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country: cc,
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primary_cred: cred,
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secondary_cred: None,
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submits_reports: submits_reports,
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}
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}
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// TODO: This should probably return an actual error type
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pub async fn invite(&mut self, state: &State) -> Result<Self, String> {
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let etable = get_reachability_credential(&state.net).await;
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let (new_cred, invite) = issue_invite(
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&state.net,
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&self.primary_cred,
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&etable,
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get_lox_pub(&state.la_pubkeys),
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get_reachability_pub(&state.la_pubkeys),
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get_invitation_pub(&state.la_pubkeys),
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)
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.await;
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self.primary_cred = new_cred;
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let (friend_cred, bucket) = redeem_invite(
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&state.net,
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&invite,
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get_lox_pub(&state.la_pubkeys),
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get_invitation_pub(&state.la_pubkeys),
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)
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.await;
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// Probabilistically decide whether this user cooperates with a censor
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// We do not influence this by the inviting friend's status. Anyone
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// might have friends who are untrustworthy, and censors may invite
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// non-censors to maintain an illusion of trustworthiness. Also, a
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// "censor" user may not be knowingly helping a censor.
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let mut rng = rand::thread_rng();
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let num: f64 = rng.gen_range(0.0..1.0);
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let censor = num < state.prob_user_is_censor;
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// Probabilistically decide whether this user submits reports
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let num: f64 = rng.gen_range(0.0..1.0);
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let submits_reports = num < state.prob_user_submits_reports;
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// Determine user's country
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let num: f64 = rng.gen_range(0.0..1.0);
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let cc = if num < state.prob_friend_in_same_country {
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self.country.to_string()
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} else {
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// Probabilistically decide user's country
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let mut num: f64 = rng.gen_range(0.0..1.0);
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let mut cc = String::default();
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for (country, prob) in &state.probs_user_in_country {
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let prob = *prob;
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if prob < num {
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cc = country.to_string();
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break;
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} else {
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num -= prob;
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}
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}
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cc
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};
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Ok(Self {
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censor: censor,
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country: cc,
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primary_cred: friend_cred,
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secondary_cred: None,
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submits_reports: submits_reports,
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})
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}
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// Attempt to "connect" to the bridge, returns true if successful
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pub fn connect(&self, bridge: &BridgeLine) -> bool {
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true
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}
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pub async fn send_negative_reports(state: &State, reports: Vec<NegativeReport>) {
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let date = get_date();
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let pubkey = state.tp_pubkeys.get(&date).unwrap();
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for report in reports {
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state
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.net_tp
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.request(
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"/negativereport".to_string(),
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bincode::serialize(&report.encrypt(&pubkey)).unwrap(),
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)
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.await;
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}
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}
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pub async fn send_positive_reports(state: &State, reports: Vec<PositiveReport>) {
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for report in reports {
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state
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.net_tp
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.request("/positivereport".to_string(), report.to_json().into_bytes())
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.await;
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}
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}
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// User performs daily connection attempts, etc. and returns a vector of
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// newly invited friends and a vector of fingerprints of successfully
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// contacted bridges.
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pub async fn daily_tasks(&mut self, state: &State) -> (Vec<User>, Vec<[u8; 20]>) {
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// Download bucket to see if bridge is still reachable
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// (We assume that this step can be done even if the user can't actually
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// talk to the LA.)
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let (bucket, reachcred) = get_bucket(&state.net, &self.primary_cred).await;
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let level = scalar_u32(&self.primary_cred.trust_level).unwrap();
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// Can we level up the main credential?
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let can_level_up = reachcred.is_some()
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&& (level == 0 && eligible_for_trust_promotion(&state.net, &self.primary_cred).await
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|| level > 0 && eligible_for_level_up(&state.net, &self.primary_cred).await);
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// Can we migrate the main credential?
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let can_migrate = reachcred.is_none() && level >= MIN_TRUST_LEVEL;
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// Can we level up the secondary credential?
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let mut second_level_up = false;
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let mut failed = Vec::<BridgeLine>::new();
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let mut succeeded = Vec::<BridgeLine>::new();
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for i in 0..bucket.len() {
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// At level 0, we only have 1 bridge
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if (level > 0 || i == 0) && self.connect(&bucket[i]) {
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if self.submits_reports && level >= 3 {
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succeeded.push(bucket[i]);
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}
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break;
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} else {
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if self.submits_reports {
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failed.push(bucket[i]);
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}
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}
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}
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let second_cred = if succeeded.len() < 1 {
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if self.secondary_cred.is_some() {
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std::mem::replace(&mut self.secondary_cred, None)
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} else {
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// Get new credential
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let (cred, bl) = get_lox_credential(
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&state.net,
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&get_open_invitation(&state.net).await,
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get_lox_pub(&state.la_pubkeys),
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)
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.await;
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Some(cred)
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}
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} else {
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// If we're able to connect with the primary credential, don't
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// keep a secondary one.
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None
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};
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if second_cred.is_some() {
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let second_cred = second_cred.as_ref().unwrap();
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let (second_bucket, second_reachcred) = get_bucket(&state.net, &second_cred).await;
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if self.connect(&second_bucket[0]) {
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succeeded.push(second_bucket[0]);
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if second_reachcred.is_some()
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&& eligible_for_trust_promotion(&state.net, &second_cred).await
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{
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second_level_up = true;
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}
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} else {
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failed.push(second_bucket[0]);
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}
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}
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let mut negative_reports = Vec::<NegativeReport>::new();
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let mut positive_reports = Vec::<PositiveReport>::new();
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if self.submits_reports {
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for bridge in &failed {
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negative_reports.push(NegativeReport::from_bridgeline(
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*bridge,
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self.country.to_string(),
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BridgeDistributor::Lox,
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));
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}
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if level >= 3 {
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for bridge in &succeeded {
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positive_reports.push(
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PositiveReport::from_lox_credential(
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bridge.fingerprint,
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None,
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&self.primary_cred,
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get_lox_pub(&state.la_pubkeys),
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self.country.to_string(),
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)
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.unwrap(),
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);
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}
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}
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}
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// We might restrict these steps to succeeded.len() > 0, but we do
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// assume the user can contact the LA somehow, so let's just allow it.
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if can_level_up {
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let cred = level_up(
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&state.net,
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&self.primary_cred,
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&reachcred.unwrap(),
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get_lox_pub(&state.la_pubkeys),
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get_reachability_pub(&state.la_pubkeys),
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)
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.await;
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self.primary_cred = cred;
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self.secondary_cred = None;
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}
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// We favor starting over at level 1 to migrating
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else if second_level_up {
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let second_cred = second_cred.as_ref().unwrap();
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let cred = trust_migration(
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&state.net,
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&second_cred,
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&trust_promotion(&state.net, &second_cred, get_lox_pub(&state.la_pubkeys)).await,
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get_lox_pub(&state.la_pubkeys),
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get_migration_pub(&state.la_pubkeys),
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)
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.await;
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self.primary_cred = cred;
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self.secondary_cred = None;
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} else if can_migrate {
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let cred = blockage_migration(
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&state.net,
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&self.primary_cred,
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&check_blockage(
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&state.net,
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&self.primary_cred,
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get_lox_pub(&state.la_pubkeys),
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)
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.await,
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get_lox_pub(&state.la_pubkeys),
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get_migration_pub(&state.la_pubkeys),
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)
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.await;
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self.primary_cred = cred;
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self.secondary_cred = None;
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} else if second_cred.is_some() {
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// Couldn't connect with primary credential
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if succeeded.len() > 0 {
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// Keep the second credential only if it's useful
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self.secondary_cred = second_cred;
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}
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}
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if negative_reports.len() > 0 {
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Self::send_negative_reports(&state, negative_reports).await;
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}
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if positive_reports.len() > 0 {
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Self::send_positive_reports(&state, positive_reports).await;
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}
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// Invite friends if applicable
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let invitations = scalar_u32(&self.primary_cred.invites_remaining).unwrap();
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let mut new_friends = Vec::<User>::new();
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for i in 0..invitations {
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let mut rng = rand::thread_rng();
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let num: f64 = rng.gen_range(0.0..1.0);
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if num < state.prob_user_invites_friend {
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match self.invite(&state).await {
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Ok(friend) => {
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// You really shouldn't push your friends, especially
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// new ones whose boundaries you might not know well.
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new_friends.push(friend);
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}
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Err(e) => {
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println!("{}", e);
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}
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}
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}
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}
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// List of fingerprints we contacted. This should not actually be more
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// than one.
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let mut connections = Vec::<[u8; 20]>::new();
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for bridge in succeeded {
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connections.push(bridge.get_hashed_fingerprint());
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}
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(new_friends, connections)
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}
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}
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