eck 0.0.4

A fast, simple file & folder encryption manager, written in Rust
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use crate::{
    diagnostic::{
        EnkryptitOutput,
        report::{Report, argument::ReportArgument, style::EnkryptitStyle},
    },
    errors::EnkryptitError,
    treatment::inspect::InspectionReport,
    types::{CompressionType, KeyType, ParallelismType},
};
use fmodeparser::FullPermission;
use hex::ToHex;

const NOT_FOUND: &str = "Not Found";

impl InspectionReport {
    pub fn display(self) -> Result<(), EnkryptitError> {
        match self {
            Self::PlaintextFile {
                name,
                directory,
                size,
                permissions,
                extension,
                mime_extension,
                predicted_compression_type,
                predicted_parallelism_type,
            } => display_plaintext_file(
                name,
                directory,
                size,
                permissions,
                extension,
                mime_extension,
                predicted_compression_type,
                predicted_parallelism_type,
            ),
            Self::EncryptedFile {
                name,
                directory,
                size,
                version,
                compression_type,
                predicted_parallelism_type,
                keytype,
                nonce,
            } => display_encrypted_file(
                name,
                directory,
                size,
                version,
                compression_type,
                predicted_parallelism_type,
                keytype,
                nonce,
            ),
            Self::EncryptedArchive {
                name,
                directory,
                size,
                version,
                entries_number,
                keytype,
            } => display_encrypted_archive(name, directory, size, version, entries_number, keytype),
            Self::Folder {
                name,
                directory,
                size,
                permissions,
            } => display_plaintext_folder(name, directory, size, permissions),
        }
        Ok(())
    }
}

#[allow(clippy::too_many_arguments)]
fn display_plaintext_file(
    name: Option<String>,
    directory: Option<String>,
    size: Option<u64>,
    permissions: Option<u32>,
    extension: Option<String>,
    mime_extension: Option<String>,
    ct: Option<CompressionType>,
    pt: Option<ParallelismType>,
) {
    // If everything is `None`, then we return that an error occured.
    if name.is_none()
        && directory.is_none()
        && size.is_none()
        && permissions.is_none()
        && extension.is_none()
        && mime_extension.is_none()
        && ct.is_none()
        && pt.is_none()
    {
        error_while_inspecting();
        return;
    }

    let mut report = Report::new(ReportArgument::title("Inspection Report"))
        .field(
            ReportArgument::label("Type"),
            ReportArgument::new(
                "Plaintext File (Not encrypted with Enkryptit!)",
                EnkryptitStyle::Orange,
            ),
        )
        .field(
            ReportArgument::label("Name"),
            ReportArgument::value(format_option(name)),
        )
        .field(
            ReportArgument::label("Directory"),
            ReportArgument::value(format_option(directory)),
        )
        .field(
            ReportArgument::label("Size"),
            ReportArgument::value_in_kib(format_option_to_kb(size)),
        );

    if let Some(perm) = permissions {
        match FullPermission::new(perm) {
            Ok(fp) => {
                report = report.field(
                    ReportArgument::label("Permissions"),
                    ReportArgument::value(fp.to_string()),
                );
            }
            Err(e) => {
                let err: EnkryptitError = e.into();
                err.into_output().display();
            }
        };
    }

    report
        .field(
            ReportArgument::label("Shown extension"),
            ReportArgument::value(format_option(extension)),
        )
        .field(
            ReportArgument::label("Real extension"),
            ReportArgument::accent(format_option(mime_extension)),
        )
        .field(
            ReportArgument::label("Recommanded compression type  (for encryption)"),
            ReportArgument::accent(format_option(ct)),
        )
        .field(
            ReportArgument::label("Recommanded parallelism type (for encryption)"),
            ReportArgument::accent(format_option(pt)),
        )
        .display();
}

#[allow(clippy::too_many_arguments)]
fn display_encrypted_file(
    name: Option<String>,
    directory: Option<String>,
    size: Option<u64>,
    version: u8,
    ct: Option<CompressionType>,
    pt: Option<ParallelismType>,
    keytype: Option<KeyType>,
    nonce: Option<[u8; 24]>,
) {
    // If everything is `None`, then we return that an error occured.
    if name.is_none()
        && directory.is_none()
        && size.is_none()
        && keytype.is_none()
        && nonce.is_none()
        && ct.is_none()
        && pt.is_none()
    {
        error_while_inspecting();
        return;
    }

    Report::new(ReportArgument::title("Inspection Report"))
        .field(
            ReportArgument::label("Type"),
            ReportArgument::value("File encrypted with Enkryptit!"),
        )
        .field(
            ReportArgument::label("Version"),
            ReportArgument::accent(version.to_string()),
        )
        .field(
            ReportArgument::label("Name"),
            ReportArgument::value(format_option(name)),
        )
        .field(
            ReportArgument::label("Directory"),
            ReportArgument::value(format_option(directory)),
        )
        .field(
            ReportArgument::label("Size"),
            ReportArgument::value_in_kib(format_option_to_kb(size)),
        )
        .field(
            ReportArgument::label("Compression type"),
            ReportArgument::accent(format_option(ct)),
        )
        .field(
            ReportArgument::label("Recommended parallelism type (for decrypting)"),
            ReportArgument::accent(format_option(pt)),
        )
        .field(
            ReportArgument::label("Key Type"),
            ReportArgument::accent(format_option(keytype)),
        )
        .field(
            ReportArgument::label("Nonce"),
            ReportArgument::accent(format_nonce(nonce)),
        )
        .display();
}

fn display_encrypted_archive(
    name: Option<String>,
    directory: Option<String>,
    size: Option<u64>,
    version: u8,
    entries_number: Option<u64>,
    keytype: Option<KeyType>,
) {
    // If everything is `None`, then we return that an error occured.
    if name.is_none()
        && directory.is_none()
        && size.is_none()
        && keytype.is_none()
        && entries_number.is_none()
    {
        error_while_inspecting();
        return;
    }

    Report::new(ReportArgument::title("Inspection Report"))
        .field(
            ReportArgument::label("Type"),
            ReportArgument::value("Folder (Archive) encrypted with Enkryptit!"),
        )
        .field(
            ReportArgument::label("Version"),
            ReportArgument::accent(version.to_string()),
        )
        .field(
            ReportArgument::label("Name"),
            ReportArgument::value(format_option(name)),
        )
        .field(
            ReportArgument::label("Directory"),
            ReportArgument::value(format_option(directory)),
        )
        .field(
            ReportArgument::label("Size"),
            ReportArgument::value_in_kib(format_option_to_kb(size)),
        )
        .field(
            ReportArgument::label("Entries number"),
            ReportArgument::accent(format_option(entries_number)),
        )
        .field(
            ReportArgument::label("Key Type"),
            ReportArgument::accent(format_option(keytype)),
        )
        .display();
}

fn display_plaintext_folder(
    name: Option<String>,
    directory: Option<String>,
    size: Option<u64>,
    permissions: Option<u32>,
) {
    // If everything is `None`, then we return that an error occured.
    if name.is_none() && directory.is_none() && size.is_none() && permissions.is_none() {
        error_while_inspecting();
        return;
    }

    let mut report = Report::new(ReportArgument::title("Inspection Report"))
        .field(
            ReportArgument::label("Type"),
            ReportArgument::value("Plaintext Folder (Not encrypted with Enkryptit!)"),
        )
        .field(
            ReportArgument::label("Name"),
            ReportArgument::value(format_option(name)),
        )
        .field(
            ReportArgument::label("Directory"),
            ReportArgument::value(format_option(directory)),
        )
        .field(
            ReportArgument::label("Size"),
            ReportArgument::value_in_kib(format_option_to_kb(size)),
        );

    if let Some(perm) = permissions {
        match FullPermission::new(perm) {
            Ok(fp) => {
                report = report.field(
                    ReportArgument::label("Permissions"),
                    ReportArgument::value(fp.to_string()),
                );
            }
            Err(e) => {
                let err: EnkryptitError = e.into();
                err.into_output().display();
            }
        };
    }

    report.display();
}

fn to_kb(size: u64) -> u64 {
    size / 1024
}

fn error_while_inspecting() {
    EnkryptitOutput::error("A severe error occured while inspecting the file.", EnkryptitError::InspectionError)
        .with_help("Please ensure that the file exists, and that its name does not contain wrong unicode character.")
        .with_location("inspect/mod.rs")
        .display();
}

fn format_option<T: std::fmt::Display>(value: Option<T>) -> String {
    value
        .map(|v| v.to_string())
        .unwrap_or_else(|| NOT_FOUND.to_string())
}

fn format_option_to_kb(value: Option<u64>) -> String {
    match value {
        Some(value) => to_kb(value).to_string(),
        None => NOT_FOUND.to_string(),
    }
}

fn format_nonce(value: Option<[u8; 24]>) -> String {
    match value {
        Some(value) => value.encode_hex::<String>(),
        None => NOT_FOUND.to_string(),
    }
}