aptos-sdk 0.4.1

//! Error types for the Aptos SDK.
//!
//! This module provides a unified error type [`AptosError`] that encompasses
//! all possible errors that can occur when using the SDK.

use std::fmt;
use thiserror::Error;

/// A specialized Result type for Aptos SDK operations.
pub type AptosResult<T> = Result<T, AptosError>;

/// The main error type for the Aptos SDK.
///
/// This enum covers all possible error conditions that can occur when
/// interacting with the Aptos blockchain through this SDK.
///
/// # Security: Logging Errors
///
/// **WARNING:** The `Display` implementation on this type may include sensitive
/// information (e.g., partial key material, JWT tokens, or mnemonic phrases) in
/// its output. When logging errors, always use [`sanitized_message()`](AptosError::sanitized_message)
/// instead of `to_string()` or `Display`:
///
/// ```rust,ignore
/// // WRONG - may leak sensitive data:
/// log::error!("Failed: {}", err);
///
/// // CORRECT - redacts sensitive patterns:
/// log::error!("Failed: {}", err.sanitized_message());
/// ```
#[derive(Error, Debug)]
pub enum AptosError {
    /// Error occurred during HTTP communication
    #[error("HTTP error: {0}")]
    Http(#[from] reqwest::Error),

    /// Error occurred during JSON serialization/deserialization
    #[error("JSON error: {0}")]
    Json(#[from] serde_json::Error),

    /// Error occurred during BCS serialization/deserialization
    #[error("BCS error: {0}")]
    Bcs(String),

    /// Error occurred during URL parsing
    #[error("URL error: {0}")]
    Url(#[from] url::ParseError),

    /// Error occurred during hex encoding/decoding
    #[error("Hex error: {0}")]
    Hex(#[from] const_hex::FromHexError),

    /// Invalid account address
    #[error("Invalid address: {0}")]
    InvalidAddress(String),

    /// Invalid public key
    #[error("Invalid public key: {0}")]
    InvalidPublicKey(String),

    /// Invalid private key
    #[error("Invalid private key: {0}")]
    InvalidPrivateKey(String),

    /// Invalid signature
    #[error("Invalid signature: {0}")]
    InvalidSignature(String),

    /// Signature verification failed
    #[error("Signature verification failed")]
    SignatureVerificationFailed,

    /// Invalid type tag format
    #[error("Invalid type tag: {0}")]
    InvalidTypeTag(String),

    /// Transaction building error
    #[error("Transaction error: {0}")]
    Transaction(String),

    /// Transaction simulation failed
    #[error("Simulation failed: {0}")]
    SimulationFailed(String),

    /// Transaction submission failed
    #[error("Submission failed: {0}")]
    SubmissionFailed(String),

    /// Transaction execution failed on chain
    #[error("Execution failed: {vm_status}")]
    ExecutionFailed {
        /// The VM status message explaining the failure
        vm_status: String,
    },

    /// Transaction timed out waiting for confirmation
    #[error("Transaction timed out after {timeout_secs} seconds")]
    TransactionTimeout {
        /// The hash of the transaction that timed out
        hash: String,
        /// How long we waited before timing out
        timeout_secs: u64,
    },

    /// API returned an error response
    #[error("API error ({status_code}): {message}")]
    Api {
        /// HTTP status code
        status_code: u16,
        /// Error message from the API
        message: String,
        /// Optional error code from the API
        error_code: Option<String>,
        /// Optional VM error code
        vm_error_code: Option<u64>,
    },

    /// Rate limited by the API
    #[error("Rate limited: retry after {retry_after_secs:?} seconds")]
    RateLimited {
        /// How long to wait before retrying (if provided)
        retry_after_secs: Option<u64>,
    },

    /// Resource not found
    #[error("Resource not found: {0}")]
    NotFound(String),

    /// Account not found
    #[error("Account not found: {0}")]
    AccountNotFound(String),

    /// Invalid mnemonic phrase
    #[error("Invalid mnemonic: {0}")]
    InvalidMnemonic(String),

    /// Invalid JWT
    #[error("Invalid JWT: {0}")]
    InvalidJwt(String),

    /// Key derivation error
    #[error("Key derivation error: {0}")]
    KeyDerivation(String),

    /// Insufficient signatures for multi-signature operation
    #[error("Insufficient signatures: need {required}, got {provided}")]
    InsufficientSignatures {
        /// Number of signatures required
        required: usize,
        /// Number of signatures provided
        provided: usize,
    },

    /// Feature not enabled
    #[error("Feature not enabled: {0}. Enable the '{0}' feature in Cargo.toml")]
    FeatureNotEnabled(String),

    /// Configuration error
    #[error("Configuration error: {0}")]
    Config(String),

    /// Internal SDK error (should not happen)
    #[error("Internal error: {0}")]
    Internal(String),

    /// Any other error
    #[error("{0}")]
    Other(#[from] anyhow::Error),
}

/// Maximum length for error messages to prevent excessive memory usage in logs.
const MAX_ERROR_MESSAGE_LENGTH: usize = 1000;

/// Patterns that might indicate sensitive information in error messages.
///
/// # Security
///
/// This list is used by [`AptosError::sanitized_message()`] to redact potentially
/// sensitive content from error messages before logging. The check is case-insensitive.
const SENSITIVE_PATTERNS: &[&str] = &[
    "private_key",
    "secret",
    "password",
    "mnemonic",
    "seed",
    "bearer",
    "authorization",
    "token",
    "jwt",
    "credential",
    "api_key",
    "apikey",
    "access_token",
    "refresh_token",
    "pepper",
];

impl AptosError {
    /// Creates a new BCS error
    pub fn bcs<E: fmt::Display>(err: E) -> Self {
        Self::Bcs(err.to_string())
    }

    /// Creates a new transaction error
    pub fn transaction<S: Into<String>>(msg: S) -> Self {
        Self::Transaction(msg.into())
    }

    /// Creates a new API error from response details
    pub fn api(status_code: u16, message: impl Into<String>) -> Self {
        Self::Api {
            status_code,
            message: message.into(),
            error_code: None,
            vm_error_code: None,
        }
    }

    /// Creates a new API error with additional details
    pub fn api_with_details(
        status_code: u16,
        message: impl Into<String>,
        error_code: Option<String>,
        vm_error_code: Option<u64>,
    ) -> Self {
        Self::Api {
            status_code,
            message: message.into(),
            error_code,
            vm_error_code,
        }
    }

    /// Returns true if this is a "not found" error
    pub fn is_not_found(&self) -> bool {
        matches!(
            self,
            Self::NotFound(_)
                | Self::AccountNotFound(_)
                | Self::Api {
                    status_code: 404,
                    ..
                }
        )
    }

    /// Returns true if this is a timeout error
    pub fn is_timeout(&self) -> bool {
        matches!(self, Self::TransactionTimeout { .. })
    }

    /// Returns true if this is a transient error that might succeed on retry
    pub fn is_retryable(&self) -> bool {
        match self {
            Self::Http(e) => e.is_timeout() || e.is_connect(),
            Self::Api { status_code, .. } => {
                matches!(status_code, 429 | 500 | 502 | 503 | 504)
            }
            Self::RateLimited { .. } => true,
            _ => false,
        }
    }

    /// Returns a sanitized version of the error message safe for logging.
    ///
    /// This method:
    /// - Removes control characters that could corrupt logs
    /// - Truncates very long messages to prevent log flooding
    /// - Redacts patterns that might indicate sensitive information
    ///
    /// # Example
    ///
    /// ```rust
    /// use aptos_sdk::AptosError;
    ///
    /// let err = AptosError::api(500, "Internal server error with details...");
    /// let safe_msg = err.sanitized_message();
    /// // safe_msg is guaranteed to be safe for logging
    /// ```
    pub fn sanitized_message(&self) -> String {
        let raw_message = self.to_string();
        Self::sanitize_string(&raw_message)
    }

    /// Sanitizes a string for safe logging.
    fn sanitize_string(s: &str) -> String {
        // Remove control characters (except newline and tab for readability)
        let cleaned: String = s
            .chars()
            .filter(|c| !c.is_control() || *c == '\n' || *c == '\t')
            .collect();

        // Check for sensitive patterns (case-insensitive)
        let lower = cleaned.to_lowercase();
        for pattern in SENSITIVE_PATTERNS {
            if lower.contains(pattern) {
                return format!("[REDACTED: message contained sensitive pattern '{pattern}']");
            }
        }

        // SECURITY: Redact URLs with query parameters, which may contain API keys
        // or other credentials not caught by keyword patterns above.
        // e.g., reqwest errors include the request URL.
        // Only redact when '?' appears within a URL token (after the scheme),
        // not just anywhere in the message.
        for scheme in ["http://", "https://"] {
            if let Some(scheme_pos) = lower.find(scheme) {
                // Look for '?' after the scheme, within the URL token
                // (URLs end at whitespace or common delimiters)
                let url_start = scheme_pos;
                let url_rest = &lower[url_start..];
                let url_end = url_rest
                    .find(|c: char| c.is_whitespace() || c == '>' || c == '"' || c == '\'')
                    .unwrap_or(url_rest.len());
                let url_token = &url_rest[..url_end];
                if url_token.contains('?') {
                    return "[REDACTED: message contained URL with query parameters]".into();
                }
            }
        }

        // Truncate if too long (find a valid UTF-8 boundary to avoid panic)
        if cleaned.len() > MAX_ERROR_MESSAGE_LENGTH {
            let mut end = MAX_ERROR_MESSAGE_LENGTH;
            while end > 0 && !cleaned.is_char_boundary(end) {
                end -= 1;
            }
            format!(
                "{}... [truncated, total length: {}]",
                &cleaned[..end],
                cleaned.len()
            )
        } else {
            cleaned
        }
    }

    /// Returns the error message suitable for display to end users.
    ///
    /// This is a more conservative sanitization that provides less detail
    /// but is safer for user-facing error messages.
    pub fn user_message(&self) -> &'static str {
        match self {
            Self::Http(_) => "Network error occurred",
            Self::Json(_) => "Failed to process response",
            Self::Bcs(_) => "Failed to process data",
            Self::Url(_) => "Invalid URL",
            Self::Hex(_) => "Invalid hex format",
            Self::InvalidAddress(_) => "Invalid account address",
            Self::InvalidPublicKey(_) => "Invalid public key",
            Self::InvalidPrivateKey(_) => "Invalid private key",
            Self::InvalidSignature(_) => "Invalid signature",
            Self::SignatureVerificationFailed => "Signature verification failed",
            Self::InvalidTypeTag(_) => "Invalid type format",
            Self::Transaction(_) => "Transaction error",
            Self::SimulationFailed(_) => "Transaction simulation failed",
            Self::SubmissionFailed(_) => "Transaction submission failed",
            Self::ExecutionFailed { .. } => "Transaction execution failed",
            Self::TransactionTimeout { .. } => "Transaction timed out",
            Self::NotFound(_)
            | Self::Api {
                status_code: 404, ..
            } => "Resource not found",
            Self::RateLimited { .. }
            | Self::Api {
                status_code: 429, ..
            } => "Rate limit exceeded",
            Self::Api { status_code, .. } if *status_code >= 500 => "Server error",
            Self::Api { .. } => "API error",
            Self::AccountNotFound(_) => "Account not found",
            Self::InvalidMnemonic(_) => "Invalid recovery phrase",
            Self::InvalidJwt(_) => "Invalid authentication token",
            Self::KeyDerivation(_) => "Key derivation failed",
            Self::InsufficientSignatures { .. } => "Insufficient signatures",
            Self::FeatureNotEnabled(_) => "Feature not enabled",
            Self::Config(_) => "Configuration error",
            Self::Internal(_) => "Internal error",
            Self::Other(_) => "An error occurred",
        }
    }
}

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

    #[test]
    fn test_error_display() {
        let err = AptosError::InvalidAddress("bad address".to_string());
        assert_eq!(err.to_string(), "Invalid address: bad address");
    }

    #[test]
    fn test_is_not_found() {
        assert!(AptosError::NotFound("test".to_string()).is_not_found());
        assert!(AptosError::AccountNotFound("0x1".to_string()).is_not_found());
        assert!(AptosError::api(404, "not found").is_not_found());
        assert!(!AptosError::api(500, "server error").is_not_found());
    }

    #[test]
    fn test_is_retryable() {
        assert!(AptosError::api(429, "rate limited").is_retryable());
        assert!(AptosError::api(503, "unavailable").is_retryable());
        assert!(AptosError::api(500, "internal error").is_retryable());
        assert!(AptosError::api(502, "bad gateway").is_retryable());
        assert!(AptosError::api(504, "timeout").is_retryable());
        assert!(!AptosError::api(400, "bad request").is_retryable());
    }

    #[test]
    fn test_is_timeout() {
        let err = AptosError::TransactionTimeout {
            hash: "0x123".to_string(),
            timeout_secs: 30,
        };
        assert!(err.is_timeout());
        assert!(!AptosError::InvalidAddress("test".to_string()).is_timeout());
    }

    #[test]
    fn test_bcs_error() {
        let err = AptosError::bcs("serialization failed");
        assert!(matches!(err, AptosError::Bcs(_)));
        assert!(err.to_string().contains("serialization failed"));
    }

    #[test]
    fn test_transaction_error() {
        let err = AptosError::transaction("invalid payload");
        assert!(matches!(err, AptosError::Transaction(_)));
        assert!(err.to_string().contains("invalid payload"));
    }

    #[test]
    fn test_api_error() {
        let err = AptosError::api(400, "bad request");
        assert!(err.to_string().contains("400"));
        assert!(err.to_string().contains("bad request"));
    }

    #[test]
    fn test_api_error_with_details() {
        let err = AptosError::api_with_details(
            400,
            "invalid argument",
            Some("INVALID_ARGUMENT".to_string()),
            Some(42),
        );
        if let AptosError::Api {
            status_code,
            message,
            error_code,
            vm_error_code,
        } = err
        {
            assert_eq!(status_code, 400);
            assert_eq!(message, "invalid argument");
            assert_eq!(error_code, Some("INVALID_ARGUMENT".to_string()));
            assert_eq!(vm_error_code, Some(42));
        } else {
            panic!("Expected Api error variant");
        }
    }

    #[test]
    fn test_various_error_displays() {
        assert!(
            AptosError::InvalidPublicKey("bad key".to_string())
                .to_string()
                .contains("public key")
        );
        assert!(
            AptosError::InvalidPrivateKey("bad key".to_string())
                .to_string()
                .contains("private key")
        );
        assert!(
            AptosError::InvalidSignature("bad sig".to_string())
                .to_string()
                .contains("signature")
        );
        assert!(
            AptosError::SignatureVerificationFailed
                .to_string()
                .contains("verification")
        );
        assert!(
            AptosError::InvalidTypeTag("bad tag".to_string())
                .to_string()
                .contains("type tag")
        );
        assert!(
            AptosError::SimulationFailed("error".to_string())
                .to_string()
                .contains("Simulation")
        );
        assert!(
            AptosError::SubmissionFailed("error".to_string())
                .to_string()
                .contains("Submission")
        );
    }

    #[test]
    fn test_execution_failed() {
        let err = AptosError::ExecutionFailed {
            vm_status: "ABORTED".to_string(),
        };
        assert!(err.to_string().contains("ABORTED"));
    }

    #[test]
    fn test_rate_limited() {
        let err = AptosError::RateLimited {
            retry_after_secs: Some(30),
        };
        assert!(err.to_string().contains("Rate limited"));
    }

    #[test]
    fn test_insufficient_signatures() {
        let err = AptosError::InsufficientSignatures {
            required: 3,
            provided: 1,
        };
        assert!(err.to_string().contains('3'));
        assert!(err.to_string().contains('1'));
    }

    #[test]
    fn test_feature_not_enabled() {
        let err = AptosError::FeatureNotEnabled("ed25519".to_string());
        assert!(err.to_string().contains("ed25519"));
        assert!(err.to_string().contains("Cargo.toml"));
    }

    #[test]
    fn test_config_error() {
        let err = AptosError::Config("invalid config".to_string());
        assert!(err.to_string().contains("Configuration"));
    }

    #[test]
    fn test_internal_error() {
        let err = AptosError::Internal("bug".to_string());
        assert!(err.to_string().contains("Internal"));
    }

    #[test]
    fn test_invalid_mnemonic() {
        let err = AptosError::InvalidMnemonic("bad phrase".to_string());
        assert!(err.to_string().contains("mnemonic"));
    }

    #[test]
    fn test_invalid_jwt() {
        let err = AptosError::InvalidJwt("bad token".to_string());
        assert!(err.to_string().contains("JWT"));
    }

    #[test]
    fn test_key_derivation() {
        let err = AptosError::KeyDerivation("failed".to_string());
        assert!(err.to_string().contains("derivation"));
    }

    #[test]
    fn test_sanitized_message_basic() {
        let err = AptosError::api(400, "bad request");
        let sanitized = err.sanitized_message();
        assert!(sanitized.contains("bad request"));
    }

    #[test]
    fn test_sanitized_message_truncates_long_messages() {
        let long_message = "x".repeat(2000);
        let err = AptosError::api(500, long_message);
        let sanitized = err.sanitized_message();
        assert!(sanitized.len() < 1200); // Should be truncated
        assert!(sanitized.contains("truncated"));
    }

    #[test]
    fn test_sanitized_message_removes_control_chars() {
        let err = AptosError::api(400, "bad\x00request\x1f");
        let sanitized = err.sanitized_message();
        assert!(!sanitized.contains('\x00'));
        assert!(!sanitized.contains('\x1f'));
    }

    #[test]
    fn test_sanitized_message_redacts_sensitive_patterns() {
        let err = AptosError::Internal("private_key: abc123".to_string());
        let sanitized = err.sanitized_message();
        assert!(sanitized.contains("REDACTED"));
        assert!(!sanitized.contains("abc123"));

        let err = AptosError::Internal("mnemonic phrase here".to_string());
        let sanitized = err.sanitized_message();
        assert!(sanitized.contains("REDACTED"));
    }

    #[test]
    fn test_user_message() {
        assert_eq!(
            AptosError::api(404, "not found").user_message(),
            "Resource not found"
        );
        assert_eq!(
            AptosError::api(429, "rate limited").user_message(),
            "Rate limit exceeded"
        );
        assert_eq!(
            AptosError::api(500, "internal error").user_message(),
            "Server error"
        );
        assert_eq!(
            AptosError::InvalidAddress("bad".to_string()).user_message(),
            "Invalid account address"
        );
    }

    #[test]
    fn test_user_message_all_variants() {
        // Test all user_message variants for coverage
        assert_eq!(
            AptosError::InvalidPublicKey("bad".to_string()).user_message(),
            "Invalid public key"
        );
        assert_eq!(
            AptosError::InvalidPrivateKey("bad".to_string()).user_message(),
            "Invalid private key"
        );
        assert_eq!(
            AptosError::InvalidSignature("bad".to_string()).user_message(),
            "Invalid signature"
        );
        assert_eq!(
            AptosError::SignatureVerificationFailed.user_message(),
            "Signature verification failed"
        );
        assert_eq!(
            AptosError::InvalidTypeTag("bad".to_string()).user_message(),
            "Invalid type format"
        );
        assert_eq!(
            AptosError::Transaction("bad".to_string()).user_message(),
            "Transaction error"
        );
        assert_eq!(
            AptosError::SimulationFailed("bad".to_string()).user_message(),
            "Transaction simulation failed"
        );
        assert_eq!(
            AptosError::SubmissionFailed("bad".to_string()).user_message(),
            "Transaction submission failed"
        );
        assert_eq!(
            AptosError::ExecutionFailed {
                vm_status: "ABORTED".to_string()
            }
            .user_message(),
            "Transaction execution failed"
        );
        assert_eq!(
            AptosError::TransactionTimeout {
                hash: "0x1".to_string(),
                timeout_secs: 30
            }
            .user_message(),
            "Transaction timed out"
        );
        assert_eq!(
            AptosError::NotFound("x".to_string()).user_message(),
            "Resource not found"
        );
        assert_eq!(
            AptosError::RateLimited {
                retry_after_secs: Some(30)
            }
            .user_message(),
            "Rate limit exceeded"
        );
        assert_eq!(
            AptosError::api(503, "unavailable").user_message(),
            "Server error"
        );
        assert_eq!(
            AptosError::api(400, "bad request").user_message(),
            "API error"
        );
        assert_eq!(
            AptosError::AccountNotFound("0x1".to_string()).user_message(),
            "Account not found"
        );
        assert_eq!(
            AptosError::InvalidMnemonic("bad".to_string()).user_message(),
            "Invalid recovery phrase"
        );
        assert_eq!(
            AptosError::InvalidJwt("bad".to_string()).user_message(),
            "Invalid authentication token"
        );
        assert_eq!(
            AptosError::KeyDerivation("bad".to_string()).user_message(),
            "Key derivation failed"
        );
        assert_eq!(
            AptosError::InsufficientSignatures {
                required: 3,
                provided: 1
            }
            .user_message(),
            "Insufficient signatures"
        );
        assert_eq!(
            AptosError::FeatureNotEnabled("ed25519".to_string()).user_message(),
            "Feature not enabled"
        );
        assert_eq!(
            AptosError::Config("bad".to_string()).user_message(),
            "Configuration error"
        );
        assert_eq!(
            AptosError::Internal("bug".to_string()).user_message(),
            "Internal error"
        );
        assert_eq!(
            AptosError::Other(anyhow::anyhow!("misc")).user_message(),
            "An error occurred"
        );
    }

    #[test]
    fn test_is_retryable_http_errors() {
        // We can't easily test reqwest errors, so just ensure non-http errors return false
        assert!(!AptosError::InvalidAddress("x".to_string()).is_retryable());
        assert!(!AptosError::Transaction("x".to_string()).is_retryable());
        assert!(!AptosError::NotFound("x".to_string()).is_retryable());
    }
}