crates-docs 1.0.0

//! Revoke API key command implementation

use std::fs;
use std::path::Path;

/// Revoke an API key from configuration file.
///
/// Removes the specified key hash or key ID from the configuration file.
/// The configuration file format and comments are preserved.
///
/// # Errors
///
/// Returns an error if:
/// - The configuration file cannot be read or written
/// - The specified key is not found
/// - The configuration file format is invalid
pub fn run_revoke_api_key_command(
    config_path: &Path,
    key_to_revoke: &str,
) -> Result<(), Box<dyn std::error::Error>> {
    // Check if config file exists
    if !config_path.exists() {
        return Err(format!("Configuration file not found: {}", config_path.display()).into());
    }

    // Read the configuration file content
    let content = fs::read_to_string(config_path)
        .map_err(|e| format!("Failed to read configuration file: {e}"))?;

    // Parse as TOML document (preserves comments and formatting)
    let mut doc = content
        .parse::<toml_edit::DocumentMut>()
        .map_err(|e| format!("Failed to parse configuration file: {e}"))?;

    // Locate the keys array. The canonical location is [auth.api_key], but we
    // also fall back to a legacy top-level [api_key] table for compatibility.
    let keys_array = find_keys_array_mut(&mut doc).ok_or(
        "API key configuration section not found in config file (expected [auth.api_key])",
    )?;

    // Find and remove the key
    let mut found = false;
    let mut indices_to_remove = Vec::new();

    for (index, item) in keys_array.iter().enumerate() {
        if let Some(key_value) = item.as_str() {
            // Match deterministically to avoid accidentally revoking the wrong
            // key. We accept either:
            //   1. An exact match of the stored value (full hash or plaintext).
            //   2. An exact match of the Argon2 PHC salt segment.
            // Loose substring matching is intentionally NOT supported because it
            // can revoke unintended keys.
            if key_value == key_to_revoke {
                indices_to_remove.push(index);
                found = true;
                break;
            }

            // Argon2 PHC format: $argon2id$v=19$m=...,t=...,p=...$<salt>$<hash>
            // Splitting on '$' yields: ["", "argon2id", "v=19", "params",
            // "<salt>", "<hash>"], so the salt is at index 4 and the hash at 5.
            if key_value.starts_with("$argon2") {
                let parts: Vec<&str> = key_value.split('$').collect();
                if parts.len() >= 6 {
                    let salt = parts[4];
                    let hash = parts[5];
                    if salt == key_to_revoke || hash == key_to_revoke {
                        indices_to_remove.push(index);
                        found = true;
                        break;
                    }
                }
            }
        }
    }

    if !found {
        println!("Key not found in configuration: {key_to_revoke}");
        println!();
        println!("Tip: Use 'crates-docs list-api-keys' to see all configured keys.");
        return Err("Key not found".into());
    }

    // Remove the key(s) - remove from highest index first to maintain validity
    indices_to_remove.sort_unstable();
    for index in indices_to_remove.iter().rev() {
        keys_array.remove(*index);
    }

    // Write back to file
    let new_content = doc.to_string();
    fs::write(config_path, new_content)
        .map_err(|e| format!("Failed to write configuration file: {e}"))?;

    println!("API key revoked successfully!");
    println!();
    println!(
        "Removed {} key(s) from: {}",
        indices_to_remove.len(),
        config_path.display()
    );
    println!();
    println!(
        "Note: If the server is running, you may need to restart it for changes to take effect."
    );
    println!("      Or use hot-reload feature if available.");

    Ok(())
}

/// Locate the mutable `keys` array in the configuration document.
///
/// Prefers the canonical `[auth.api_key]` table and falls back to a legacy
/// top-level `[api_key]` table for backward compatibility.
fn find_keys_array_mut(doc: &mut toml_edit::DocumentMut) -> Option<&mut toml_edit::Array> {
    // Prefer [auth.api_key].keys
    let in_auth = doc
        .get("auth")
        .and_then(toml_edit::Item::as_table)
        .and_then(|t| t.get("api_key"))
        .and_then(toml_edit::Item::as_table)
        .and_then(|t| t.get("keys"))
        .and_then(toml_edit::Item::as_array)
        .is_some();

    if in_auth {
        return doc
            .get_mut("auth")
            .and_then(toml_edit::Item::as_table_mut)
            .and_then(|t| t.get_mut("api_key"))
            .and_then(toml_edit::Item::as_table_mut)
            .and_then(|t| t.get_mut("keys"))
            .and_then(toml_edit::Item::as_array_mut);
    }

    // Fall back to legacy top-level [api_key].keys
    doc.get_mut("api_key")
        .and_then(toml_edit::Item::as_table_mut)
        .and_then(|t| t.get_mut("keys"))
        .and_then(toml_edit::Item::as_array_mut)
}

#[cfg(test)]
mod tests {
    use super::*;
    use std::io::Write;
    use tempfile::NamedTempFile;

    #[test]
    fn test_revoke_api_key_removes_key() {
        let mut temp_file = NamedTempFile::new().unwrap();
        let content = r#"
[server]
host = "127.0.0.1"
port = 8080

[auth.api_key]
enabled = true
keys = ["$argon2id$v=19$m=47104,t=1,p=1$c2FsdA$hash1", "$argon2id$v=19$m=47104,t=1,p=1$c2FsdB$hash2"]
header_name = "X-API-Key"
"#;
        temp_file.write_all(content.as_bytes()).unwrap();

        let path = temp_file.path();
        let result =
            run_revoke_api_key_command(path, "$argon2id$v=19$m=47104,t=1,p=1$c2FsdA$hash1");
        assert!(result.is_ok());

        // Verify the key was removed
        let new_content = std::fs::read_to_string(path).unwrap();
        assert!(new_content.contains("hash2"));
        assert!(!new_content.contains("hash1"));
    }

    #[test]
    fn test_revoke_api_key_preserves_comments() {
        let mut temp_file = NamedTempFile::new().unwrap();
        let content = r#"
[server]
# Server configuration
host = "127.0.0.1"
port = 8080

[auth.api_key]
# API key configuration
enabled = true
# List of API key hashes
keys = ["$argon2id$v=19$m=47104,t=1,p=1$c2FsdA$hash1", "$argon2id$v=19$m=47104,t=1,p=1$c2FsdB$hash2"]
header_name = "X-API-Key"
"#;
        temp_file.write_all(content.as_bytes()).unwrap();

        let path = temp_file.path();
        let result =
            run_revoke_api_key_command(path, "$argon2id$v=19$m=47104,t=1,p=1$c2FsdA$hash1");
        assert!(result.is_ok());

        // Verify comments are preserved
        let new_content = std::fs::read_to_string(path).unwrap();
        assert!(new_content.contains("# Server configuration"));
        assert!(new_content.contains("# API key configuration"));
        assert!(new_content.contains("# List of API key hashes"));
    }

    #[test]
    fn test_revoke_api_key_not_found() {
        let mut temp_file = NamedTempFile::new().unwrap();
        let content = r#"
[auth.api_key]
enabled = true
keys = ["$argon2id$v=19$m=47104,t=1,p=1$c2FsdA$hash1"]
"#;
        temp_file.write_all(content.as_bytes()).unwrap();

        let path = temp_file.path();
        let result = run_revoke_api_key_command(path, "nonexistent_key");
        assert!(result.is_err());
    }

    #[test]
    fn test_revoke_api_key_file_not_found() {
        let result = run_revoke_api_key_command(Path::new("/nonexistent/config.toml"), "key");
        assert!(result.is_err());
    }

    #[test]
    fn test_revoke_api_key_legacy_top_level_section() {
        let mut temp_file = NamedTempFile::new().unwrap();
        let content = r#"
[api_key]
enabled = true
keys = ["$argon2id$v=19$m=47104,t=1,p=1$c2FsdA$hash1", "$argon2id$v=19$m=47104,t=1,p=1$c2FsdB$hash2"]
"#;
        temp_file.write_all(content.as_bytes()).unwrap();
        let path = temp_file.path();
        let result =
            run_revoke_api_key_command(path, "$argon2id$v=19$m=47104,t=1,p=1$c2FsdA$hash1");
        assert!(result.is_ok());
        let new_content = std::fs::read_to_string(path).unwrap();
        assert!(new_content.contains("hash2"));
        assert!(!new_content.contains("hash1"));
    }

    #[test]
    fn test_revoke_api_key_substring_does_not_match() {
        // A loose substring of a stored hash must NOT revoke any key.
        let mut temp_file = NamedTempFile::new().unwrap();
        let content = r#"
[auth.api_key]
enabled = true
keys = ["$argon2id$v=19$m=47104,t=1,p=1$c2FsdA$hash1"]
"#;
        temp_file.write_all(content.as_bytes()).unwrap();
        let path = temp_file.path();
        // "hash1" is a substring but not an exact value/salt/hash segment match.
        let result = run_revoke_api_key_command(path, "argon2id");
        assert!(result.is_err());
        let new_content = std::fs::read_to_string(path).unwrap();
        assert!(new_content.contains("hash1"));
    }

    #[test]
    fn test_revoke_api_key_by_salt_segment() {
        let mut temp_file = NamedTempFile::new().unwrap();
        let content = r#"
[auth.api_key]
enabled = true
keys = ["$argon2id$v=19$m=47104,t=1,p=1$c2FsdA$hash1", "$argon2id$v=19$m=47104,t=1,p=1$c2FsdB$hash2"]
"#;
        temp_file.write_all(content.as_bytes()).unwrap();
        let path = temp_file.path();
        // Revoke by the unique salt segment of the second key.
        let result = run_revoke_api_key_command(path, "c2FsdB");
        assert!(result.is_ok());
        let new_content = std::fs::read_to_string(path).unwrap();
        assert!(new_content.contains("hash1"));
        assert!(!new_content.contains("hash2"));
    }
}