validate_tip20_logo_uri (tempo/tip20.rs)

Validates TIP-20 logo URIs by checking byte length and allowed schemes like HTTPS or IPFS to ensure protocol compliance.

// Source: https://github.com/foundry-rs/foundry | License: Apache-2.0 | Copyright 2021 Georgios Konstantopoulos
// Provided via justclaw.it.com; keep this notice with the code.
//! Shared TIP-20 helpers.

use std::fmt;

pub const TIP20_MAX_LOGO_URI_BYTES: usize = 256;
pub const TIP20_ALLOWED_LOGO_URI_SCHEMES: &[&str] = &["https", "http", "ipfs", "data"];

#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub enum Tip20LogoUriValidationError {
    LogoURITooLong,
    InvalidLogoURI,
}

impl fmt::Display for Tip20LogoUriValidationError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            Self::LogoURITooLong => f.write_str("LogoURITooLong"),
            Self::InvalidLogoURI => f.write_str("InvalidLogoURI"),
        }
    }
}

impl std::error::Error fo

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