ic-query 0.76.2

//! Module: nns::governance::validation
//!
//! Responsibility: validate direct Governance requests, provenance, and payload invariants.
//! Does not own: transport execution, report assembly, or error presentation.
//! Boundary: runs identically for native, canister, and caller-provided sources.

#[cfg(any(
    all(feature = "canister", target_arch = "wasm32"),
    all(test, feature = "nns-host")
))]
use super::MAX_NNS_GOVERNANCE_RESPONSE_BYTES;
use super::{
    NnsGovernanceCollectionStatus, NnsGovernanceError, NnsGovernanceMetrics, NnsGovernanceRequest,
    NnsGovernanceSourceProvenance, NnsGovernanceSourceSelection,
};
use crate::nns::MAINNET_GOVERNANCE_CANISTER_ID;
use crate::subnet_catalog::MAINNET_NETWORK;
use ic_host_text::timestamp::parse_utc_timestamp_secs;

pub fn validate_governance_request(
    request: &NnsGovernanceRequest,
) -> Result<(), NnsGovernanceError> {
    enforce_mainnet_network(&request.network)?;
    validate_source_selection(&request.source)?;
    parse_governance_timestamp("fetched_at", &request.fetched_at).map(|_| ())
}

/// Check the fixed identity shared by portable Governance analytics reports.
pub fn validate_governance_report_identity(network: &str, canister_id: &str) -> Result<(), String> {
    if network != MAINNET_NETWORK {
        return Err(format!("network is {network}, expected {MAINNET_NETWORK}"));
    }
    if canister_id != MAINNET_GOVERNANCE_CANISTER_ID {
        return Err(format!(
            "governance_canister_id is {canister_id}, expected {MAINNET_GOVERNANCE_CANISTER_ID}"
        ));
    }
    Ok(())
}

/// Retain the transport-specific context when analytics provenance is invalid.
pub fn validate_governance_collection_source(
    network: &str,
    source: &NnsGovernanceSourceProvenance,
) -> Result<(), String> {
    validate_governance_report_source(network, source).map_err(|error| {
        let context = match source {
            NnsGovernanceSourceProvenance::ReplicaQuery { .. } => "source",
            NnsGovernanceSourceProvenance::ReplicatedInterCanisterCall { .. } => "provenance",
        };
        format!("invalid collection {context}: {error}")
    })
}

/// Bind a continuation request to the collection's original network and source.
pub fn validate_governance_continuation_request<Error>(
    request: &NnsGovernanceRequest,
    network: &str,
    source: &NnsGovernanceSourceSelection,
    mismatch: impl FnOnce(&'static str, String, String) -> Error,
) -> Result<(), Error> {
    if request.network != network {
        return Err(mismatch(
            "network",
            network.to_string(),
            request.network.clone(),
        ));
    }
    if request.source != *source {
        return Err(mismatch(
            "requested_source",
            format!("{source:?}"),
            format!("{:?}", request.source),
        ));
    }
    Ok(())
}

// Both persisted collection states retain these fields and project family-specific errors.
macro_rules! validate_governance_continuation {
    ($request:expr, $state:expr, $error:ident) => {{
        use $crate::nns::governance::NnsGovernanceCollectionStatus;
        let request = $request;
        let state = $state;
        $crate::nns::governance::validate_governance_continuation_request(
            request,
            &state.network,
            &state.requested_source,
            |field, expected, actual| $error::CollectionRequestMismatch {
                field,
                expected,
                actual,
            },
        )?;
        $crate::nns::governance::validate_governance_time_interval(
            "updated_at",
            &state.updated_at,
            "fetched_at",
            &request.fetched_at,
        )?;
        match state.status {
            NnsGovernanceCollectionStatus::Complete => Err($error::CollectionComplete {
                pages_fetched: state.pages_fetched,
            }),
            NnsGovernanceCollectionStatus::PageLimitReached => {
                Err($error::CollectionPageLimitReached {
                    pages_fetched: state.pages_fetched,
                    max_pages: state.max_pages,
                })
            }
            NnsGovernanceCollectionStatus::Ready | NnsGovernanceCollectionStatus::Collecting => {
                Ok(())
            }
        }
    }};
}

pub(in crate::nns) use validate_governance_continuation;

/// Admit the retained page evidence shared by complete Governance analytics reports.
pub fn validate_governance_analytics_pages(
    pages: u32,
    rows: u64,
    report_label: &str,
    row_label: &str,
) -> Result<(), String> {
    if pages == 0 {
        return Err(format!(
            "complete {report_label} report must retain at least one collection page"
        ));
    }
    let minimum = u64::from(pages - 1);
    if rows < minimum {
        return Err(format!(
            "collection_page_count {pages} requires at least {minimum} collected {row_label}, found {rows}"
        ));
    }
    Ok(())
}

/// Admit restored collection identity and timestamps before family page-size checks.
pub fn validate_governance_collection_identity<Error>(
    network: &str,
    canister_id: &str,
    source: &NnsGovernanceSourceSelection,
    (started_at, updated_at): (&str, &str),
    invalid: impl FnOnce(String) -> Error,
) -> Result<(), Error>
where
    Error: From<NnsGovernanceError>,
{
    if canister_id != MAINNET_GOVERNANCE_CANISTER_ID {
        return Err(invalid(format!(
            "governance_canister_id is {canister_id}, expected {MAINNET_GOVERNANCE_CANISTER_ID}"
        )));
    }
    validate_governance_request(&NnsGovernanceRequest {
        network: network.to_string(),
        fetched_at: started_at.to_string(),
        source: source.clone(),
    })?;
    validate_governance_time_interval("started_at", started_at, "updated_at", updated_at)?;
    Ok(())
}

/// Admit collection page ceilings before validating retained source provenance.
pub fn validate_governance_collection_page_bounds<Error>(
    max_pages: u32,
    pages_fetched: u32,
    invalid: impl FnOnce(String) -> Error,
) -> Result<(), Error> {
    if max_pages == 0 {
        return Err(invalid("max_pages must be greater than zero".to_string()));
    }
    if pages_fetched > max_pages {
        return Err(invalid(format!(
            "pages_fetched {pages_fetched} exceeds max_pages {max_pages}"
        )));
    }
    Ok(())
}

fn parse_governance_timestamp(field: &'static str, value: &str) -> Result<u64, NnsGovernanceError> {
    parse_utc_timestamp_secs(value).ok_or_else(|| NnsGovernanceError::InvalidTimestamp {
        field,
        value: value.to_string(),
    })
}

/// Validate an inclusive chronological interval of canonical UTC timestamps.
pub fn validate_governance_time_interval(
    start_field: &'static str,
    start: &str,
    end_field: &'static str,
    end: &str,
) -> Result<(), NnsGovernanceError> {
    let start_unix_secs = parse_governance_timestamp(start_field, start)?;
    let end_unix_secs = parse_governance_timestamp(end_field, end)?;
    if start_unix_secs > end_unix_secs {
        return Err(NnsGovernanceError::InvalidTimestampOrder {
            start_field,
            start: start.to_string(),
            end_field,
            end: end.to_string(),
        });
    }
    Ok(())
}

#[cfg(any(
    all(feature = "canister", target_arch = "wasm32"),
    all(test, feature = "nns-host")
))]
pub(super) const fn validate_governance_response_size(
    method: &'static str,
    actual_bytes: usize,
) -> Result<(), NnsGovernanceError> {
    if actual_bytes <= MAX_NNS_GOVERNANCE_RESPONSE_BYTES {
        Ok(())
    } else {
        Err(NnsGovernanceError::ResponseTooLarge {
            method,
            actual_bytes,
            maximum_bytes: MAX_NNS_GOVERNANCE_RESPONSE_BYTES,
        })
    }
}

pub fn enforce_mainnet_network(network: &str) -> Result<(), NnsGovernanceError> {
    if network == MAINNET_NETWORK {
        Ok(())
    } else {
        Err(NnsGovernanceError::UnsupportedNetwork {
            network: network.to_string(),
        })
    }
}

fn validate_source_selection(
    selection: &NnsGovernanceSourceSelection,
) -> Result<(), NnsGovernanceError> {
    match selection {
        NnsGovernanceSourceSelection::ReplicaQuery {
            endpoint,
            fetched_by,
        } => validate_replica_query_source(endpoint, fetched_by),
        NnsGovernanceSourceSelection::ReplicatedInterCanisterCall => Ok(()),
    }
}

fn validate_replica_query_source(
    endpoint: &str,
    fetched_by: &str,
) -> Result<(), NnsGovernanceError> {
    if fetched_by.trim().is_empty() {
        return Err(NnsGovernanceError::InvalidSourceSelection {
            reason: "replica_query fetched_by must not be empty".to_string(),
        });
    }
    crate::http_endpoint::parse_http_endpoint(endpoint)
        .map(|_| ())
        .map_err(|reason| NnsGovernanceError::InvalidSourceSelection {
            reason: format!("invalid endpoint {endpoint:?}: {reason}"),
        })
}

pub fn validate_source_provenance(
    selection: &NnsGovernanceSourceSelection,
    provenance: &NnsGovernanceSourceProvenance,
) -> Result<(), NnsGovernanceError> {
    match (selection, provenance) {
        (
            NnsGovernanceSourceSelection::ReplicaQuery {
                endpoint,
                fetched_by,
            },
            NnsGovernanceSourceProvenance::ReplicaQuery {
                endpoint: actual_endpoint,
                fetched_by: actual_fetched_by,
            },
        ) if endpoint == actual_endpoint && fetched_by == actual_fetched_by => Ok(()),
        (
            NnsGovernanceSourceSelection::ReplicatedInterCanisterCall,
            NnsGovernanceSourceProvenance::ReplicatedInterCanisterCall {
                collector_canister_id,
            },
        ) => crate::principal_text::validate_canonical(
            collector_canister_id,
            |reason| NnsGovernanceError::SourceEvidenceMismatch {
                reason: format!(
                    "invalid collector_canister_id: invalid principal in principal: {collector_canister_id}: {reason}"
                ),
            },
            |_| NnsGovernanceError::SourceEvidenceMismatch {
                reason: "collector_canister_id is not canonical principal text".to_string(),
            },
        ),
        _ => Err(NnsGovernanceError::SourceEvidenceMismatch {
            reason: format!("requested {selection:?}, received {provenance:?}"),
        }),
    }
}

/// Validate the network and concrete source retained by a caller-owned Governance report.
pub fn validate_governance_report_source(
    network: &str,
    provenance: &NnsGovernanceSourceProvenance,
) -> Result<(), NnsGovernanceError> {
    enforce_mainnet_network(network)?;
    match provenance {
        NnsGovernanceSourceProvenance::ReplicaQuery {
            endpoint,
            fetched_by,
        } => validate_replica_query_source(endpoint, fetched_by),
        NnsGovernanceSourceProvenance::ReplicatedInterCanisterCall { .. } => {
            validate_source_provenance(
                &NnsGovernanceSourceSelection::ReplicatedInterCanisterCall,
                provenance,
            )
        }
    }
}

pub(super) fn validate_governance_metrics(
    metrics: &NnsGovernanceMetrics,
) -> Result<(), NnsGovernanceError> {
    for (field, buckets) in [
        (
            "not_dissolving_neurons_e8s_buckets",
            metrics.not_dissolving_neurons_e8s_buckets.as_slice(),
        ),
        (
            "dissolving_neurons_staked_maturity_e8s_equivalent_buckets",
            metrics
                .dissolving_neurons_staked_maturity_e8s_equivalent_buckets
                .as_slice(),
        ),
        (
            "not_dissolving_neurons_e8s_buckets_ect",
            metrics.not_dissolving_neurons_e8s_buckets_ect.as_slice(),
        ),
        (
            "dissolving_neurons_e8s_buckets_seed",
            metrics.dissolving_neurons_e8s_buckets_seed.as_slice(),
        ),
        (
            "not_dissolving_neurons_staked_maturity_e8s_equivalent_buckets",
            metrics
                .not_dissolving_neurons_staked_maturity_e8s_equivalent_buckets
                .as_slice(),
        ),
        (
            "dissolving_neurons_e8s_buckets_ect",
            metrics.dissolving_neurons_e8s_buckets_ect.as_slice(),
        ),
        (
            "dissolving_neurons_e8s_buckets",
            metrics.dissolving_neurons_e8s_buckets.as_slice(),
        ),
        (
            "not_dissolving_neurons_e8s_buckets_seed",
            metrics.not_dissolving_neurons_e8s_buckets_seed.as_slice(),
        ),
    ] {
        if let Some(bucket) = buckets.iter().find(|bucket| !bucket.value.is_finite()) {
            return Err(NnsGovernanceError::InvalidMetrics {
                field,
                key: bucket.key,
                value: bucket.value,
            });
        }
    }
    Ok(())
}

pub fn advance_collection_counts(pages: u32, rows: u64, page_rows: u64) -> Option<(u32, u64)> {
    Some((pages.checked_add(1)?, rows.checked_add(page_rows)?))
}

pub const fn collection_lifecycle_matches(
    status: NnsGovernanceCollectionStatus,
    pages: u32,
    max_pages: u32,
    rows: u64,
    maximum_rows: u64,
    has_cursor: bool,
    has_source: bool,
) -> bool {
    match status {
        NnsGovernanceCollectionStatus::Ready => {
            pages == 0 && rows == 0 && !has_cursor && !has_source
        }
        NnsGovernanceCollectionStatus::Collecting => {
            pages > 0 && pages < max_pages && rows == maximum_rows && has_cursor && has_source
        }
        NnsGovernanceCollectionStatus::Complete => pages > 0 && !has_cursor && has_source,
        NnsGovernanceCollectionStatus::PageLimitReached => {
            pages == max_pages && rows == maximum_rows && has_cursor && has_source
        }
    }
}

pub const fn collection_status_after_page(
    has_next: bool,
    pages: u32,
    max_pages: u32,
) -> super::NnsGovernanceCollectionStatus {
    if !has_next {
        super::NnsGovernanceCollectionStatus::Complete
    } else if pages == max_pages {
        super::NnsGovernanceCollectionStatus::PageLimitReached
    } else {
        super::NnsGovernanceCollectionStatus::Collecting
    }
}

pub fn validate_governance_collection_row_bounds<Error>(
    field: &str,
    rows: u64,
    pages: u32,
    page_size: u32,
    invalid: impl FnOnce(String) -> Error,
) -> Result<u64, Error> {
    // Widen before multiplication: both operands originate as u32.
    let maximum = u64::from(pages) * u64::from(page_size);
    let minimum = u64::from(pages.saturating_sub(1)) * u64::from(page_size);
    if rows < minimum || rows > maximum {
        return Err(invalid(format!(
            "{field} {rows} is outside {minimum}..={maximum} for {pages} pages of size {page_size}"
        )));
    }
    Ok(maximum)
}