fakecloud-dynamodb 0.15.4

//! dynamodb helpers `keys` concerns (audit-2026-05-19).

use super::*;

pub(crate) fn extract_key(
    table: &DynamoTable,
    item: &HashMap<String, AttributeValue>,
) -> HashMap<String, AttributeValue> {
    let mut key = HashMap::new();
    let hash_key = table.hash_key_name();
    if let Some(v) = item.get(hash_key) {
        key.insert(hash_key.to_string(), v.clone());
    }
    if let Some(range_key) = table.range_key_name() {
        if let Some(v) = item.get(range_key) {
            key.insert(range_key.to_string(), v.clone());
        }
    }
    key
}

/// Parse a JSON object into a key map (used for ExclusiveStartKey).
pub(crate) fn parse_key_map(value: &Value) -> Option<HashMap<String, AttributeValue>> {
    let obj = value.as_object()?;
    if obj.is_empty() {
        return None;
    }
    Some(obj.iter().map(|(k, v)| (k.clone(), v.clone())).collect())
}

/// Check whether an item's key attributes match the given key map.
pub(crate) fn item_matches_key(
    item: &HashMap<String, AttributeValue>,
    key: &HashMap<String, AttributeValue>,
    hash_key_name: &str,
    range_key_name: Option<&str>,
) -> bool {
    let hash_match = match (item.get(hash_key_name), key.get(hash_key_name)) {
        (Some(a), Some(b)) => a == b,
        _ => false,
    };
    if !hash_match {
        return false;
    }
    match range_key_name {
        Some(rk) => match (item.get(rk), key.get(rk)) {
            (Some(a), Some(b)) => a == b,
            (None, None) => true,
            _ => false,
        },
        None => true,
    }
}

/// Extract the primary key from an item given explicit key attribute names.
pub(crate) fn extract_key_for_schema(
    item: &HashMap<String, AttributeValue>,
    hash_key_name: &str,
    range_key_name: Option<&str>,
) -> HashMap<String, AttributeValue> {
    let mut key = HashMap::new();
    if let Some(v) = item.get(hash_key_name) {
        key.insert(hash_key_name.to_string(), v.clone());
    }
    if let Some(rk) = range_key_name {
        if let Some(v) = item.get(rk) {
            key.insert(rk.to_string(), v.clone());
        }
    }
    key
}

pub(crate) fn validate_key_in_item(
    table: &DynamoTable,
    item: &HashMap<String, AttributeValue>,
) -> Result<(), AwsServiceError> {
    let hash_key = table.hash_key_name();
    if !item.contains_key(hash_key) {
        return Err(AwsServiceError::aws_error(
            StatusCode::BAD_REQUEST,
            "ValidationException",
            format!("Missing the key {hash_key} in the item"),
        ));
    }
    if let Some(range_key) = table.range_key_name() {
        if !item.contains_key(range_key) {
            return Err(AwsServiceError::aws_error(
                StatusCode::BAD_REQUEST,
                "ValidationException",
                format!("Missing the key {range_key} in the item"),
            ));
        }
    }
    Ok(())
}

pub(crate) fn validate_key_attributes_in_key(
    table: &DynamoTable,
    key: &HashMap<String, AttributeValue>,
) -> Result<(), AwsServiceError> {
    let hash_key = table.hash_key_name();
    if !key.contains_key(hash_key) {
        return Err(AwsServiceError::aws_error(
            StatusCode::BAD_REQUEST,
            "ValidationException",
            format!("Missing the key {hash_key} in the item"),
        ));
    }
    // Composite-key tables require BOTH hash and range in the Key map;
    // omitting the range key would otherwise let GetItem / DeleteItem
    // succeed with an under-specified key.
    if let Some(range_key) = table.range_key_name() {
        if !key.contains_key(range_key) {
            return Err(AwsServiceError::aws_error(
                StatusCode::BAD_REQUEST,
                "ValidationException",
                format!("Missing the key {range_key} in the item"),
            ));
        }
    }
    Ok(())
}