common_proc_macro/
lib.rs

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extern crate proc_macro;

use proc_macro::TokenStream;
use quote::ToTokens;
use syn::{parse_macro_input, AttributeArgs, ItemFn};

use crate::expand::HasPermissions;

mod expand;

const HAS_AUTHORITIES: &str = "has_permissions";
const HAS_ANY_AUTHORITY: &str = "has_any_permission";

const HAS_ROLES: &str = "has_roles";
const HAS_ANY_ROLE: &str = "has_any_role";

#[proc_macro_attribute]
pub fn has_permissions(args: TokenStream, input: TokenStream) -> TokenStream {
    check_permissions(HAS_AUTHORITIES, args, input)
}

#[proc_macro_attribute]
pub fn has_any_permission(args: TokenStream, input: TokenStream) -> TokenStream {
    check_permissions(HAS_ANY_AUTHORITY, args, input)
}

#[proc_macro_attribute]
pub fn has_roles(args: TokenStream, input: TokenStream) -> TokenStream {
    check_permissions(HAS_ROLES, args, input)
}

#[proc_macro_attribute]
pub fn has_any_role(args: TokenStream, input: TokenStream) -> TokenStream {
    check_permissions(HAS_ANY_ROLE, args, input)
}

fn check_permissions(check_fn_name: &str, args: TokenStream, input: TokenStream) -> TokenStream {
    let args = parse_macro_input!(args as AttributeArgs);
    let func = parse_macro_input!(input as ItemFn);

    match HasPermissions::new(check_fn_name, args, func) {
        Ok(has_permissions) => has_permissions.into_token_stream().into(),
        Err(err) => err.to_compile_error().into(),
    }
}