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Rust derive macro for redacting sensitive data in std::fmt::Debug

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A derive macro that implements [`std::fmt::Debug`](https://doc.rust-lang.org/std/fmt/trait.Debug.html) for a struct or enum variant, with certain fields redacted.

The purpose of this macro is to allow for easy, configurable and efficient redaction of sensitive data in structs and enum variants.
This can be used to hide sensitive data in logs or anywhere where personal data should not be exposed or stored.

# Usage

Add to your Cargo.toml:

```toml
[dependencies]
veil = "0.3.0"
```

Usage documentation can be found [here](https://docs.rs/veil).

# Example

The example is explained in detail [here](https://docs.rs/veil).

```rust
#[derive(Redact)]
struct CreditCard {
    #[redact(partial)]
    number: String,

#[redact]
    expiry: String,

#[redact(fixed = 3)]
    cvv: String,

#[redact(partial)]
    cardholder_name: String,
}

#[derive(Redact)]
#[redact(all, variant)]
enum CreditCardIssuer {
    MasterCard,
    Visa,
    AmericanExpress,
}

#[derive(Redact)]
#[redact(all, partial)]
struct Vehicle {
    license_plate: String,
    make: String,
    model: String,
    color: String,
}

#[derive(Debug)]
struct Policy {
    id: Uuid,
    name: String,
    description: String,
}

#[derive(Redact)]
enum InsuranceStatus {
    #[redact(all, partial)]
    Insured {
        #[redact(fixed = 12)]
        policy: Policy,

policy_started: String,
        policy_expires: String,

#[redact(skip)]
        payment_card: CreditCard,

#[redact(skip)]
        vehicles: Vec<Vehicle>,
    },

Uninsured {
        policies_available: Vec<Policy>,
    },
}
```

# Environmental Awareness

In testing environments it may be useful to disable redaction entirely. You can globally disable Veil's redaction behavior at runtime by enabling the *non-default* feature flag `toggle` and:

- Setting the `VEIL_DISABLE_REDACTION` environment variable to "1", "true" or "on" (case insensitive).

- Calling the [`veil::disable`](https://docs.rs/veil/latest/veil/fn.disable.html) function. See this [example](examples/disable_redaction.rs).

These are only checked ONCE for security purposes.

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