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// Copyright 2017 rust-hyper-multipart-rfc7578 Developers // Copyright 2018 rust-multipart-rfc7578 Developers // // Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or // http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or // http://opensource.org/licenses/MIT>, at your option. This file may not be // copied, modified, or distributed except according to those terms. // use rand::{distributions::Alphanumeric, rngs::SmallRng, FromEntropy, Rng}; use std::iter::FromIterator; /// A `BoundaryGenerator` is a policy to generate a random string to use /// as a part boundary. /// /// The default generator will build a random string of 6 ascii characters. /// If you need more complexity, you can implement this, and use it with /// [`Form::new`](/multipart_rfc7578/multipart/struct.Form.html#method.new). /// /// # Examples /// /// ``` /// use multipart_rfc7578::BoundaryGenerator; /// /// struct TestGenerator; /// /// impl BoundaryGenerator for TestGenerator { /// fn generate_boundary() -> String { /// "test".to_string() /// } /// } /// ``` pub trait BoundaryGenerator { /// Generates a String to use as a boundary. /// fn generate_boundary() -> String; } pub struct RandomAsciiGenerator; impl BoundaryGenerator for RandomAsciiGenerator { /// Creates a boundary of 6 ascii characters. /// fn generate_boundary() -> String { let mut rng = SmallRng::from_entropy(); let ascii = rng.sample_iter(&Alphanumeric); String::from_iter(ascii.take(6)) } }