codewhale-telemetry 0.9.8

//! Install identity and the constant half of the batch envelope.

use std::path::Path;

use anyhow::{Context, Result};
use serde::{Deserialize, Serialize};

use crate::buffer;
use crate::event::{Arch, Libc, Os};

/// How long an install id may live before it is replaced.
///
/// A never-rotating id plus one batch per session from the user's IP is a
/// longitudinal IP and travel trace. Rotation bounds that join. It costs
/// longitudinal accuracy, and the docs say so in those words: **no count derived
/// from `install_id` is a user count.**
pub const ROTATION_DAYS: i64 = 90;

/// The on-disk install identity.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct InstallId {
    /// Format version of this file.
    pub schema_version: u32,
    /// A random v4 UUID.
    ///
    /// Never derived from hostname, MAC, `machine-id`, `$HOME`, username, or
    /// executable path. A derived id is a device fingerprint: it survives
    /// reinstall and re-identifies a user across their own opt-out, which is the
    /// single thing an install id must never do.
    pub install_id: String,
    /// When this id was minted, RFC3339 UTC.
    pub rotated_at: String,
}

/// Per-machine telemetry bookkeeping. Never contains anything about the user's
/// work — only what this crate needs to avoid re-reporting an install and to
/// rate-limit its own flushes.
#[derive(Debug, Clone, Default, Serialize, Deserialize)]
pub struct TelemetryState {
    /// Format version of this file.
    #[serde(default)]
    pub schema_version: u32,
    /// The app version last seen on this machine.
    #[serde(default)]
    pub last_version: Option<String>,
    /// When a flush was last *attempted*, RFC3339 UTC. Attempt, not success, so
    /// a permanently offline machine tries at most once per interval.
    #[serde(default)]
    pub last_flush: Option<String>,
}

/// Read the install id, minting a fresh one if it is missing, unreadable,
/// **not a UUID**, or older than [`ROTATION_DAYS`].
///
/// The UUID check is not a formatting nicety. `install_id` is the one
/// envelope field read verbatim off disk into a batch, so without it the file
/// is a free-form string slot on the wire for anything that can write
/// `$CODEWHALE_HOME/telemetry/install_id.json`. Minting a fresh random id is
/// always the safe direction — the cost is one rotation, and the docs already
/// say no count derived from `install_id` is a user count.
pub fn read_or_create_install_id(root: &Path) -> Result<InstallId> {
    buffer::try_with_lock(root, || {
        if buffer::tombstone_present(root) {
            anyhow::bail!("telemetry is disabled");
        }
        let path = buffer::install_id_path(root);
        let existing = std::fs::read_to_string(&path)
            .ok()
            .and_then(|body| serde_json::from_str::<InstallId>(&body).ok())
            .filter(|record| uuid::Uuid::parse_str(record.install_id.trim()).is_ok())
            .filter(|record| !is_expired(&record.rotated_at));
        if let Some(record) = existing {
            return Ok(record);
        }
        let record = InstallId {
            schema_version: 1,
            install_id: uuid::Uuid::new_v4().to_string(),
            rotated_at: now_rfc3339(),
        };
        codewhale_config::persistence::atomic_write_json(&path, &record)
            .with_context(|| format!("failed to write {}", path.display()))?;
        Ok(record)
    })?
    .ok_or_else(|| anyhow::anyhow!("telemetry privacy lock is held"))
}

fn is_expired(rotated_at: &str) -> bool {
    let Ok(parsed) = chrono::DateTime::parse_from_rfc3339(rotated_at) else {
        // An unreadable timestamp is treated as expired: minting a fresh random
        // id is always the safe direction.
        return true;
    };
    let age = chrono::Utc::now().signed_duration_since(parsed.with_timezone(&chrono::Utc));
    age.num_days() >= ROTATION_DAYS
}

/// Read `state.json`, or a default when it is missing or unreadable.
#[must_use]
pub fn read_state(root: &Path) -> TelemetryState {
    std::fs::read_to_string(buffer::state_path(root))
        .ok()
        .and_then(|body| serde_json::from_str::<TelemetryState>(&body).ok())
        .unwrap_or_default()
}

/// Write `state.json`.
pub fn write_state(root: &Path, state: &TelemetryState) -> Result<()> {
    buffer::try_with_lock(root, || {
        if buffer::tombstone_present(root) {
            anyhow::bail!("telemetry is disabled");
        }
        let path = buffer::state_path(root);
        codewhale_config::persistence::atomic_write_json(&path, state)
            .with_context(|| format!("failed to write {}", path.display()))
    })?
    .ok_or_else(|| anyhow::anyhow!("telemetry privacy lock is held"))
}

/// RFC3339 UTC at second precision. The only timestamp this crate produces, and
/// it is per-**batch**: individual events carry no timestamps at all.
#[must_use]
pub fn now_rfc3339() -> String {
    chrono::Utc::now()
        .to_rfc3339_opts(chrono::SecondsFormat::Secs, true)
        .to_string()
}

/// The build sha of a release-CI binary, or `None`.
///
/// Sourced from `CODEWHALE_RELEASE_BUILD_SHA`, a rustc-env this crate's build
/// script emits **only** when `DEEPSEEK_BUILD_SHA` or `GITHUB_SHA` was present
/// in the build environment. `null` for every locally built binary,
/// unconditionally, with no runtime lookup of any kind.
///
/// Never `CODEWHALE_BUILD_COMMIT` — that falls back to the builder's own `HEAD`
/// on a local build. Never `Thread.git_sha` — that is the *user's* workspace
/// commit and a red line, one identifier away by name.
#[must_use]
pub fn release_build_sha() -> Option<String> {
    option_env!("CODEWHALE_RELEASE_BUILD_SHA").and_then(short_hex_sha)
}

/// Reduce a full sha to the first 12 lowercase hex characters, rejecting
/// anything that is not a sha.
#[must_use]
pub fn short_hex_sha(value: &str) -> Option<String> {
    let trimmed = value.trim().to_ascii_lowercase();
    if trimmed.len() < 12 || !trimmed.bytes().all(|b| b.is_ascii_hexdigit()) {
        return None;
    }
    Some(trimmed.chars().take(12).collect())
}

/// The OS family this binary is running on, mapped onto the closed whitelist.
#[must_use]
pub fn current_os() -> Os {
    match std::env::consts::OS {
        "linux" => Os::Linux,
        "macos" => Os::Macos,
        "windows" => Os::Windows,
        "freebsd" => Os::Freebsd,
        "android" => Os::Android,
        _ => Os::Other,
    }
}

/// The CPU family, mapped onto the closed whitelist.
#[must_use]
pub fn current_arch() -> Arch {
    match std::env::consts::ARCH {
        "x86_64" => Arch::X86_64,
        "aarch64" => Arch::Aarch64,
        _ => Arch::Other,
    }
}

/// The libc this binary was **compiled** against.
#[must_use]
pub fn current_libc() -> Libc {
    if cfg!(target_env = "gnu") {
        Libc::Gnu
    } else if cfg!(target_env = "musl") {
        Libc::Musl
    } else {
        Libc::None
    }
}

/// Whether both stdin and stdout are terminals.
///
/// This varies because consent is machine-scoped: a decision recorded on a TTY
/// authorizes later headless runs on the same home.
#[must_use]
pub fn current_tty() -> bool {
    use std::io::IsTerminal as _;
    std::io::stdin().is_terminal() && std::io::stdout().is_terminal()
}

/// Reduce a panic location to something that is safe to send.
///
/// Emit a `crates/…` path verbatim; reduce **everything else** to the literal
/// `<dep>`. There is no `--remap-path-prefix` in this repo, so a panic inside a
/// registry dependency yields
/// `/Users/<builder>/.cargo/registry/src/…/ratatui-0.29.0/src/…` — the build
/// machine's username, shipped from every user's binary.
/// The allowlist itself lives in [`crate::event::is_reduced_panic_site`], and
/// this function is defined as "the candidate if the predicate accepts it".
/// Two copies of one charset would drift, and the drain path re-checks the
/// predicate against events read back off disk — a reducer that could emit
/// something the checker rejects would silently delete real panics.
#[must_use]
pub fn reduce_panic_site(file: &str, line: u32, column: u32) -> String {
    let candidate = format!("{}:{line}:{column}", file.replace('\\', "/"));
    if crate::event::is_reduced_panic_site(&candidate) {
        candidate
    } else {
        "<dep>".to_string()
    }
}