git-paw 0.8.0

//! Common dev-command allowlist seeding for the supervisor.
//!
//! Implements the `dev-command-allowlist` capability: write a curated
//! preset of prefix patterns into
//! `.claude/settings.json::allowed_bash_prefixes` so the supervisor
//! does not hand-approve every dev-loop command variant.
//!
//! The preset is split into two tiers (see `design.md` D2):
//!
//! - [`DEV_ALLOWLIST_PRESET`] — the **universal** set, hard-coded and
//!   always seeded. It contains only commands that are safe and useful
//!   in essentially any repository regardless of language or toolchain
//!   (non-destructive git verbs plus read-only `find` / `grep` /
//!   `sed -n`). It is the single source of truth for the universal
//!   tier — no other location may hard-code these patterns.
//! - [`stack_preset`] / the named `*_STACK_PRESET` constants — curated,
//!   opt-in **stack-specific** bundles (`rust` / `node` / `python` /
//!   `go`). A repository opts in via
//!   `[supervisor.common_dev_allowlist] stacks = ["rust", ...]`; the
//!   seeder resolves the selected stacks to the union of the universal
//!   preset, each selected stack, and any `extra` patterns.
//!
//! Users further extend the result through
//! `[supervisor.common_dev_allowlist] extra = [...]`. The merge
//! semantics are identical to [`crate::supervisor::curl_allowlist`]:
//! existing entries are preserved, missing entries are appended, no
//! duplicates are written, and the parent directory is created when
//! missing.
//!
//! Every seeded value is a command **prefix** (a verb, or verb plus
//! subcommand) that subsumes all per-invocation argument variations —
//! e.g. `git diff` (which prefix-matches `git diff --stat HEAD~1`),
//! never a fully-argumented command line. A prefix grant collapses the
//! infinite set of per-run argument variations into one approval.

use std::path::Path;

use crate::error::PawError;

/// Universal dev-loop prefix patterns seeded into Claude's
/// `allowed_bash_prefixes` on supervisor start, independent of the
/// repository's language or toolchain.
///
/// Inclusion rubric (see `design.md` D3): bounded side-effects (no
/// arbitrary network or arbitrary code execution); aligns with
/// CLAUDE.md's git-safety protocol. Destructive git operations
/// (`git rebase`, `git reset`, `git checkout`, `git push --force`)
/// and write-mode `sed` are intentionally excluded; stack-specific
/// toolchain commands are NOT hard-coded here — they are opt-in via
/// the named stack presets (see [`stack_preset`]) and/or `extra`.
///
/// The constant is the single source of truth for the universal tier
/// — no other location in the codebase may hard-code these patterns.
pub const DEV_ALLOWLIST_PRESET: &[&str] = &[
    // Git read-only.
    "git status",
    "git log",
    "git diff",
    "git show",
    "git fetch",
    // Git write (non-destructive; rebase/reset/checkout excluded).
    "git commit",
    "git push",
    "git pull",
    "git merge",
    "git stash",
    "git add",
    "git restore",
    "git rm",
    // Search (read-only; `sed -n` is the read-only invocation).
    "find",
    "grep",
    "sed -n",
];

/// Curated `rust` stack preset (opt-in via `stacks = ["rust"]`).
///
/// Build/test/lint verbs only; `cargo install` / `cargo run` /
/// `cargo bench` are excluded per the D3 rubric.
pub const RUST_STACK_PRESET: &[&str] = &[
    "cargo build",
    "cargo test",
    "cargo clippy",
    "cargo fmt",
    "cargo check",
    "cargo tree",
    "cargo deny",
    "cargo update",
];

/// Curated `node` stack preset (opt-in via `stacks = ["node"]`).
///
/// Package-manager build/test/install verbs only; `publish` /
/// `uninstall` and arbitrary-script execution beyond the curated
/// verbs are excluded per the D3 rubric.
pub const NODE_STACK_PRESET: &[&str] = &[
    "npm install",
    "npm ci",
    "npm test",
    "npm run",
    "pnpm install",
    "pnpm test",
    "pnpm run",
    "yarn install",
    "yarn test",
];

/// Curated `python` stack preset (opt-in via `stacks = ["python"]`).
///
/// Test/lint/format/dependency verbs only; arbitrary `python -c` and
/// publish/upload verbs are excluded per the D3 rubric.
pub const PYTHON_STACK_PRESET: &[&str] = &[
    "pytest",
    "pip install",
    "ruff",
    "black",
    "mypy",
    "flake8",
    "uv pip",
    "uv sync",
];

/// Curated `go` stack preset (opt-in via `stacks = ["go"]`).
///
/// Build/test/vet/format verbs only; `go run` (arbitrary code
/// execution) is excluded per the D3 rubric.
pub const GO_STACK_PRESET: &[&str] = &[
    "go build",
    "go test",
    "go vet",
    "go fmt",
    "gofmt",
    "go mod",
    "golangci-lint",
];

/// Resolves a stack-preset name to its curated prefix list.
///
/// Returns the matching `*_STACK_PRESET` slice for a known name
/// (`rust` / `node` / `python` / `go`), or `None` for an unrecognised
/// name. Matching is case-sensitive against the lowercase names a
/// repository declares in `[supervisor.common_dev_allowlist] stacks`.
/// An unknown stack name contributes nothing (no error) so a typo or a
/// future stack name in an older binary degrades gracefully.
#[must_use]
pub fn stack_preset(name: &str) -> Option<&'static [&'static str]> {
    match name {
        "rust" => Some(RUST_STACK_PRESET),
        "node" => Some(NODE_STACK_PRESET),
        "python" => Some(PYTHON_STACK_PRESET),
        "go" => Some(GO_STACK_PRESET),
        _ => None,
    }
}

/// Returns the effective ordered pattern list: the universal preset,
/// followed by each selected stack preset, followed by `extra`,
/// de-duplicated.
///
/// Resolution order (see `design.md` D2): the universal
/// [`DEV_ALLOWLIST_PRESET`] first (declaration order), then each named
/// preset from `stacks` in selection order (unknown names contribute
/// nothing), then `extra` in input order. A pattern already present
/// from an earlier tier is not added again, so the result is the
/// de-duplicated union.
#[must_use]
pub fn effective_patterns(stacks: &[String], extra: &[String]) -> Vec<String> {
    let mut out: Vec<String> = DEV_ALLOWLIST_PRESET
        .iter()
        .map(|s| (*s).to_string())
        .collect();
    let push_unique = |out: &mut Vec<String>, pat: &str| {
        if !out.iter().any(|existing| existing == pat) {
            out.push(pat.to_string());
        }
    };
    for stack in stacks {
        if let Some(preset) = stack_preset(stack) {
            for pat in preset {
                push_unique(&mut out, pat);
            }
        }
    }
    for entry in extra {
        push_unique(&mut out, entry);
    }
    out
}

/// Merges the dev-allowlist preset + `extra` patterns into the JSON
/// file at `settings_path`.
///
/// Behaviour mirrors [`crate::supervisor::curl_allowlist::setup_curl_allowlist`]:
///
/// - When `settings_path` does not exist, a fresh JSON object is
///   created with `allowed_bash_prefixes` set to
///   [`effective_patterns`] applied to `stacks` + `extra`.
/// - When the file exists with valid JSON, existing fields are
///   preserved unchanged and missing entries are appended to the
///   `allowed_bash_prefixes` array.
/// - When the file exists but is not a JSON object (or
///   `allowed_bash_prefixes` is not an array), an error is returned
///   and the file is left unchanged.
/// - Parent directories are created when missing.
/// - The function never panics.
///
/// # Errors
///
/// Returns [`PawError::ConfigError`] when the file cannot be read,
/// contains invalid JSON, has a non-object top level, has a
/// non-array `allowed_bash_prefixes`, or cannot be written back.
pub fn setup_dev_allowlist(
    stacks: &[String],
    extra: &[String],
    settings_path: &Path,
) -> Result<(), PawError> {
    let new_entries = effective_patterns(stacks, extra);

    let mut value: serde_json::Value = if settings_path.exists() {
        let raw = std::fs::read_to_string(settings_path).map_err(|e| {
            PawError::ConfigError(format!("failed to read {}: {e}", settings_path.display()))
        })?;
        if raw.trim().is_empty() {
            serde_json::Value::Object(serde_json::Map::new())
        } else {
            serde_json::from_str(&raw).map_err(|e| {
                PawError::ConfigError(format!("{}: invalid JSON: {e}", settings_path.display()))
            })?
        }
    } else {
        serde_json::Value::Object(serde_json::Map::new())
    };

    let obj = value.as_object_mut().ok_or_else(|| {
        PawError::ConfigError(format!(
            "{}: top-level value must be a JSON object",
            settings_path.display()
        ))
    })?;

    let entry = obj
        .entry("allowed_bash_prefixes".to_string())
        .or_insert_with(|| serde_json::Value::Array(Vec::new()));

    let array = entry.as_array_mut().ok_or_else(|| {
        PawError::ConfigError(format!(
            "{}: allowed_bash_prefixes must be an array",
            settings_path.display()
        ))
    })?;

    for new_entry in new_entries {
        let already_present = array
            .iter()
            .any(|v| v.as_str().is_some_and(|s| s == new_entry));
        if !already_present {
            array.push(serde_json::Value::String(new_entry));
        }
    }

    if let Some(parent) = settings_path.parent()
        && !parent.as_os_str().is_empty()
    {
        std::fs::create_dir_all(parent).map_err(|e| {
            PawError::ConfigError(format!("failed to create {}: {e}", parent.display()))
        })?;
    }

    let serialized = serde_json::to_string_pretty(&value).map_err(|e| {
        PawError::ConfigError(format!(
            "failed to serialize {}: {e}",
            settings_path.display()
        ))
    })?;
    std::fs::write(settings_path, serialized).map_err(|e| {
        PawError::ConfigError(format!("failed to write {}: {e}", settings_path.display()))
    })?;
    Ok(())
}

/// Seeds the dev allowlist into every Claude settings target a
/// supervisor session needs.
///
/// Targets:
///
/// - `<repo>/.claude/settings.json` — always written (its parent
///   `<repo>/.claude/` is created if absent).
/// - each path in `alt_settings` — a configured alternate settings
///   file (resolved from `[clis.<name>].settings_path`). These are
///   written only when their parent directory already exists; a
///   target whose parent is absent is skipped, never created. The
///   target set is config-driven — there is no hardcoded CLI name or
///   path.
///
/// Each target is processed independently and failures are reported
/// individually via the returned [`Vec`]; callers (e.g.
/// `cmd_supervisor`) treat the per-target result as non-fatal and
/// log warnings to stderr while continuing session start. Returns
/// the empty vec on full success.
pub fn seed_supervisor_session(
    stacks: &[String],
    extra: &[String],
    repo_root: &Path,
    alt_settings: &[std::path::PathBuf],
) -> Vec<(std::path::PathBuf, PawError)> {
    let mut failures = Vec::new();

    let repo_settings = repo_root.join(".claude").join("settings.json");
    if let Err(e) = setup_dev_allowlist(stacks, extra, &repo_settings) {
        failures.push((repo_settings, e));
    }

    for target in alt_settings {
        // Defence-in-depth: skip a target whose parent directory does not
        // exist so the seeder never creates an alternate config dir (the
        // caller's resolver already filters on this, but `setup_dev_allowlist`
        // would otherwise `create_dir_all` the parent).
        if target.parent().is_some_and(std::path::Path::is_dir)
            && let Err(e) = setup_dev_allowlist(stacks, extra, target)
        {
            failures.push((target.clone(), e));
        }
    }

    failures
}

#[cfg(test)]
mod tests {
    use super::*;
    use tempfile::TempDir;

    fn read_array(path: &Path) -> Vec<String> {
        let raw = std::fs::read_to_string(path).unwrap();
        let v: serde_json::Value = serde_json::from_str(&raw).unwrap();
        v.get("allowed_bash_prefixes")
            .and_then(|v| v.as_array())
            .map(|arr| {
                arr.iter()
                    .filter_map(|x| x.as_str().map(String::from))
                    .collect()
            })
            .unwrap_or_default()
    }

    #[test]
    fn writes_preset_when_file_absent() {
        let tmp = TempDir::new().unwrap();
        let path = tmp.path().join("settings.json");
        setup_dev_allowlist(&[], &[], &path).unwrap();
        let entries = read_array(&path);
        for pat in DEV_ALLOWLIST_PRESET {
            assert!(
                entries.iter().any(|e| e == pat),
                "missing preset pattern {pat:?} in {entries:?}",
            );
        }
    }

    #[test]
    fn merges_with_existing_user_entries() {
        let tmp = TempDir::new().unwrap();
        let path = tmp.path().join("settings.json");
        std::fs::write(
            &path,
            r#"{"some_custom_field":"value","allowed_bash_prefixes":["my-tool","some-other"]}"#,
        )
        .unwrap();
        setup_dev_allowlist(&[], &[], &path).unwrap();
        let raw = std::fs::read_to_string(&path).unwrap();
        let v: serde_json::Value = serde_json::from_str(&raw).unwrap();
        assert_eq!(
            v.get("some_custom_field").and_then(|x| x.as_str()),
            Some("value"),
            "must preserve unrelated top-level fields",
        );
        let entries = read_array(&path);
        assert!(entries.iter().any(|e| e == "my-tool"));
        assert!(entries.iter().any(|e| e == "some-other"));
        for pat in DEV_ALLOWLIST_PRESET {
            assert!(entries.iter().any(|e| e == pat), "missing {pat}");
        }
    }

    #[test]
    fn does_not_duplicate_existing_preset_entries() {
        let tmp = TempDir::new().unwrap();
        let path = tmp.path().join("settings.json");
        std::fs::write(
            &path,
            r#"{"allowed_bash_prefixes":["git diff","git push"]}"#,
        )
        .unwrap();
        setup_dev_allowlist(&[], &[], &path).unwrap();
        let entries = read_array(&path);
        assert_eq!(entries.iter().filter(|e| *e == "git diff").count(), 1);
        assert_eq!(entries.iter().filter(|e| *e == "git push").count(), 1);
    }

    #[test]
    fn appends_extra_patterns_after_preset() {
        let tmp = TempDir::new().unwrap();
        let path = tmp.path().join("settings.json");
        let extra = vec!["pnpm test".to_string(), "deno fmt".to_string()];
        setup_dev_allowlist(&[], &extra, &path).unwrap();
        let entries = read_array(&path);
        assert!(entries.iter().any(|e| e == "pnpm test"));
        assert!(entries.iter().any(|e| e == "deno fmt"));
        let pnpm_idx = entries.iter().position(|e| e == "pnpm test").unwrap();
        let last_preset_idx = entries
            .iter()
            .rposition(|e| DEV_ALLOWLIST_PRESET.contains(&e.as_str()))
            .unwrap();
        assert!(
            pnpm_idx > last_preset_idx,
            "extra entries must follow the preset; entries: {entries:?}",
        );
    }

    #[test]
    fn extra_entries_not_validated() {
        let tmp = TempDir::new().unwrap();
        let path = tmp.path().join("settings.json");
        let extra = vec!["this is nonsense $$".to_string()];
        setup_dev_allowlist(&[], &extra, &path).unwrap();
        let entries = read_array(&path);
        assert!(entries.iter().any(|e| e == "this is nonsense $$"));
    }

    #[test]
    fn extra_duplicates_preset_entry_not_added_twice() {
        let tmp = TempDir::new().unwrap();
        let path = tmp.path().join("settings.json");
        let extra = vec!["git diff".to_string()];
        setup_dev_allowlist(&[], &extra, &path).unwrap();
        let entries = read_array(&path);
        assert_eq!(
            entries.iter().filter(|e| *e == "git diff").count(),
            1,
            "git diff appears more than once: {entries:?}",
        );
    }

    #[test]
    fn invalid_json_returns_error_not_panic() {
        let tmp = TempDir::new().unwrap();
        let path = tmp.path().join("settings.json");
        std::fs::write(&path, "not json {{{").unwrap();
        let err = setup_dev_allowlist(&[], &[], &path).unwrap_err();
        let msg = err.to_string();
        assert!(msg.contains("invalid JSON"), "got: {msg}");
        // File left unchanged.
        let raw = std::fs::read_to_string(&path).unwrap();
        assert_eq!(raw, "not json {{{");
    }

    #[test]
    fn creates_parent_directory_when_missing() {
        let tmp = TempDir::new().unwrap();
        let path = tmp.path().join(".claude").join("settings.json");
        assert!(!path.parent().unwrap().exists());
        setup_dev_allowlist(&[], &[], &path).unwrap();
        assert!(path.exists());
    }

    #[test]
    fn preset_constant_contains_only_universal_patterns() {
        // The universal preset SHALL contain exactly the stack-neutral
        // git + search verbs and nothing else.
        let required = [
            "git status",
            "git log",
            "git diff",
            "git show",
            "git fetch",
            "git commit",
            "git push",
            "git pull",
            "git merge",
            "git stash",
            "git add",
            "git restore",
            "git rm",
            "find",
            "grep",
            "sed -n",
        ];
        for r in required {
            assert!(
                DEV_ALLOWLIST_PRESET.contains(&r),
                "universal preset missing required pattern: {r}",
            );
        }
        // The set is *exactly* the universal patterns — no extras crept in.
        assert_eq!(
            DEV_ALLOWLIST_PRESET.len(),
            required.len(),
            "universal preset must contain exactly the required patterns; got {DEV_ALLOWLIST_PRESET:?}",
        );

        // Stack-specific patterns moved to named presets / `extra` SHALL
        // NOT be hard-coded in the universal preset.
        let stack_specific = [
            "cargo build",
            "cargo test",
            "cargo clippy",
            "cargo fmt",
            "cargo check",
            "just",
            "mdbook build",
            "openspec validate",
            "openspec status",
            "npm install",
            "pytest",
            "go build",
        ];
        for s in stack_specific {
            assert!(
                !DEV_ALLOWLIST_PRESET.contains(&s),
                "universal preset must not contain stack-specific pattern: {s}",
            );
        }

        // Destructive patterns stay excluded from the universal set.
        let excluded = [
            "git rebase",
            "git reset",
            "git checkout",
            "git branch -D",
            "git push --force",
            "git push -f",
            "sed",
        ];
        for e in excluded {
            assert!(
                !DEV_ALLOWLIST_PRESET.contains(&e),
                "preset must not contain excluded pattern: {e}",
            );
        }
    }

    #[test]
    fn curated_stack_presets_obey_the_exclusion_rubric() {
        // No curated stack preset may carry a destructive / arbitrary-
        // code-execution verb (design.md D3).
        let forbidden = [
            "cargo install",
            "cargo run",
            "cargo bench",
            "go run",
            "npm publish",
            "npm uninstall",
            "pip uninstall",
        ];
        for stack in ["rust", "node", "python", "go"] {
            let preset = stack_preset(stack).expect("named stack resolves");
            for f in forbidden {
                assert!(
                    !preset.contains(&f),
                    "stack `{stack}` must not contain forbidden verb: {f}",
                );
            }
        }
        // Unknown stack names resolve to nothing (graceful degradation).
        assert!(stack_preset("haskell").is_none());
    }

    #[test]
    fn rust_stack_preset_carries_curated_cargo_verbs() {
        let preset = stack_preset("rust").expect("rust stack resolves");
        for pat in ["cargo build", "cargo test", "cargo clippy"] {
            assert!(preset.contains(&pat), "rust stack missing {pat}");
        }
    }

    #[test]
    fn effective_patterns_orders_preset_before_extra() {
        let extra = vec!["pnpm test".to_string()];
        let out = effective_patterns(&[], &extra);
        let pnpm_idx = out.iter().position(|s| s == "pnpm test").unwrap();
        let git_idx = out.iter().position(|s| s == "git diff").unwrap();
        assert!(
            git_idx < pnpm_idx,
            "preset entries must precede extra: git@{git_idx} vs pnpm@{pnpm_idx}",
        );
    }

    #[test]
    fn effective_patterns_deduplicates_extra_against_preset() {
        let extra = vec!["git diff".to_string()];
        let out = effective_patterns(&[], &extra);
        assert_eq!(out.iter().filter(|s| *s == "git diff").count(), 1);
    }

    #[test]
    fn effective_patterns_universal_only_when_no_stacks_or_extra() {
        let out = effective_patterns(&[], &[]);
        let expected: Vec<String> = DEV_ALLOWLIST_PRESET
            .iter()
            .map(|s| (*s).to_string())
            .collect();
        assert_eq!(
            out, expected,
            "no stacks + no extra must yield exactly the universal preset"
        );
        // Spot-check no stack leakage.
        assert!(!out.iter().any(|s| s == "cargo build"));
    }

    #[test]
    fn effective_patterns_rust_stack_adds_cargo_prefixes() {
        let stacks = vec!["rust".to_string()];
        let out = effective_patterns(&stacks, &[]);
        for pat in RUST_STACK_PRESET {
            assert!(out.iter().any(|s| s == pat), "missing rust prefix {pat}");
        }
        // Universal preset still present; ordering is universal-then-stack.
        let git_idx = out.iter().position(|s| s == "git diff").unwrap();
        let cargo_idx = out.iter().position(|s| s == "cargo build").unwrap();
        assert!(git_idx < cargo_idx, "universal must precede stack prefixes");
    }

    #[test]
    fn effective_patterns_node_stack_has_no_cargo() {
        let stacks = vec!["node".to_string()];
        let out = effective_patterns(&stacks, &[]);
        assert!(out.iter().any(|s| s.starts_with("npm")));
        assert!(
            !out.iter().any(|s| s.starts_with("cargo")),
            "node stack must not seed any cargo prefix: {out:?}",
        );
    }

    #[test]
    fn effective_patterns_multiple_stacks_compose_as_dedup_union() {
        let stacks = vec!["rust".to_string(), "python".to_string()];
        let out = effective_patterns(&stacks, &[]);
        assert!(out.iter().any(|s| s == "cargo build"));
        assert!(out.iter().any(|s| s == "pytest"));
        // No duplicates anywhere in the union.
        let mut seen = std::collections::HashSet::new();
        for s in &out {
            assert!(seen.insert(s.clone()), "duplicate pattern in union: {s}");
        }
    }

    #[test]
    fn effective_patterns_unknown_stack_contributes_nothing() {
        let stacks = vec!["haskell".to_string()];
        let out = effective_patterns(&stacks, &[]);
        let expected: Vec<String> = DEV_ALLOWLIST_PRESET
            .iter()
            .map(|s| (*s).to_string())
            .collect();
        assert_eq!(out, expected, "unknown stack must add nothing");
    }

    #[test]
    fn rejects_top_level_array() {
        let tmp = TempDir::new().unwrap();
        let path = tmp.path().join("settings.json");
        std::fs::write(&path, "[]").unwrap();
        let err = setup_dev_allowlist(&[], &[], &path).unwrap_err();
        let msg = err.to_string();
        assert!(msg.contains("must be a JSON object"), "got: {msg}");
    }
}