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use quote::quote;
use syn::{Data, DeriveInput, Fields, Meta, Path};
use super::ValidatorHandler;
use crate::{
common::{attributes::base_xx_attribute::BaseXXAttribute, type_enum::TypeEnum},
panic,
};
pub(crate) struct Base64Handler;
#[allow(dead_code)]
#[derive(Debug)]
pub struct Struct(TypeEnum);
const ITEM: Struct = Struct(TypeEnum::String);
impl ValidatorHandler for Base64Handler {
fn meta_handler(ast: DeriveInput, meta: Meta) -> syn::Result<proc_macro2::TokenStream> {
let type_attribute = BaseXXAttribute::build_from_meta(&meta)?;
if let Data::Struct(data) = ast.data
&& let Fields::Unnamed(_) = &data.fields
&& data.fields.len() == 1
{
let mut token_stream = proc_macro2::TokenStream::new();
let name = ast.ident;
let error_path: Path = syn::parse2(quote! { validators_prelude::Base64Error }).unwrap();
#[cfg(feature = "test")]
{
let v_padding = type_attribute.padding;
token_stream.extend(quote! {
impl #name {
pub(crate) const V_PADDING: validators_prelude::TriAllow = #v_padding;
}
});
}
let check_last_length = if type_attribute.padding.must() {
quote! {
if last_length != 4 {
return Err(#error_path::PaddingMust);
}
}
} else {
quote! {}
};
let handle_padding = if type_attribute.padding.disallow() {
quote! {
return Err(#error_path::PaddingDisallow);
}
} else {
quote! {
match p {
2 | 3 => {
if last_length != 4 {
// has padding
return Err(#error_path::Invalid);
}
for e in last_bytes[p + 1..].iter().copied() {
if e != b'=' {
return Err(#error_path::Invalid);
}
}
return Ok(());
}
_ => return Err(#error_path::Invalid),
}
}
};
token_stream.extend(quote! {
impl #name {
#[inline]
fn v_parse_str(s: &str) -> Result<(), #error_path> {
Self::v_parse_u8_slice(s.as_bytes())
}
fn v_parse_u8_slice(v: &[u8]) -> Result<(), #error_path> {
let length = v.len();
if length == 0 {
return Err(#error_path::Invalid);
}
let last_length = {
let l = length & 0b11;
if l == 0 {
4
} else {
l
}
};
#check_last_length
let last_bytes = if length > 4 {
for e in v.iter().copied().take(length - last_length) {
match e {
b'A'..=b'Z' | b'a'..=b'z' | b'0'..=b'9' | b'+' | b'/' => (),
_ => return Err(#error_path::Invalid),
}
}
&v[(length - last_length)..]
} else {
v.as_ref()
};
let mut p = 0;
loop {
if p == last_length {
return Ok(());
}
let e = last_bytes[p];
match e {
b'A'..=b'Z' | b'a'..=b'z' | b'0'..=b'9' | b'+' | b'/' => (),
b'=' => {
#handle_padding
}
_ => return Err(#error_path::Invalid),
}
p += 1;
}
}
}
});
token_stream.extend(quote! {
impl ValidateString for #name {
type Error = #error_path;
#[inline]
fn parse_string<S: Into<validators_prelude::String>>(s: S) -> Result<Self, Self::Error> {
let s = s.into();
Self::v_parse_str(s.as_str())?;
Ok(Self(s))
}
#[inline]
fn parse_str<S: AsRef<str>>(s: S) -> Result<Self, Self::Error> {
let s = s.as_ref();
Self::v_parse_str(s)?;
Ok(Self(validators_prelude::String::from(s)))
}
#[inline]
fn validate_str<S: AsRef<str>>(s: S) -> Result<(), Self::Error> {
Self::v_parse_str(s.as_ref())?;
Ok(())
}
}
impl ValidateBytes for #name {
type Error = #error_path;
#[inline]
fn parse_vec_u8<V: Into<validators_prelude::Vec<u8>>>(v: V) -> Result<Self, Self::Error> {
let v = v.into();
Self::v_parse_u8_slice(v.as_slice())?;
Ok(Self(unsafe { validators_prelude::String::from_utf8_unchecked(v) }))
}
#[inline]
fn parse_u8_slice<V: AsRef<[u8]>>(v: V) -> Result<Self, Self::Error> {
let v = v.as_ref();
Self::v_parse_u8_slice(v)?;
Ok(Self(unsafe { validators_prelude::String::from_utf8_unchecked(v.to_vec()) }))
}
#[inline]
fn validate_u8_slice<V: AsRef<[u8]>>(v: V) -> Result<(), Self::Error> {
Self::v_parse_u8_slice(v.as_ref())?;
Ok(())
}
}
});
#[cfg(feature = "serde")]
{
if type_attribute.serde_options.serialize {
token_stream.extend(quote! {
impl validators_prelude::serde::Serialize for #name {
#[inline]
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: validators_prelude::serde::Serializer, {
serializer.serialize_str(self.0.as_str())
}
}
});
}
if type_attribute.serde_options.deserialize {
use crate::common::tri_allow::TriAllow;
let expect = match type_attribute.padding {
TriAllow::Allow => "a Base64 string or data",
TriAllow::Must => "a Base64 string or data with padding",
TriAllow::Disallow => "a Base64 string or data without padding",
};
token_stream.extend(quote! {
impl<'de> validators_prelude::serde::Deserialize<'de> for #name {
#[inline]
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: validators_prelude::serde::Deserializer<'de>, {
struct MyVisitor;
impl<'de> validators_prelude::serde::de::Visitor<'de> for MyVisitor {
type Value = #name;
#[inline]
fn expecting(&self, f: &mut ::core::fmt::Formatter<'_>) -> ::core::fmt::Result {
f.write_str(#expect)
}
#[inline]
fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
where
E: validators_prelude::serde::de::Error, {
<#name as ValidateString>::parse_str(v).map_err(validators_prelude::serde::de::Error::custom)
}
#[inline]
fn visit_string<E>(self, v: validators_prelude::String) -> Result<Self::Value, E>
where
E: validators_prelude::serde::de::Error, {
<#name as ValidateString>::parse_string(v).map_err(validators_prelude::serde::de::Error::custom)
}
#[inline]
fn visit_bytes<E>(self, v: &[u8]) -> Result<Self::Value, E>
where
E: validators_prelude::serde::de::Error, {
<#name as ValidateBytes>::parse_u8_slice(v).map_err(validators_prelude::serde::de::Error::custom)
}
#[inline]
fn visit_byte_buf<E>(self, v: validators_prelude::Vec<u8>) -> Result<Self::Value, E>
where
E: validators_prelude::serde::de::Error, {
<#name as ValidateBytes>::parse_vec_u8(v).map_err(validators_prelude::serde::de::Error::custom)
}
}
deserializer.deserialize_any(MyVisitor)
}
}
});
}
}
#[cfg(feature = "rocket")]
{
if type_attribute.rocket_options.from_form_field {
crate::common::rocket::impl_from_form_field(&mut token_stream, &name);
}
if type_attribute.rocket_options.from_param {
crate::common::rocket::impl_from_param(&mut token_stream, &name, &error_path);
}
}
return Ok(token_stream);
}
Err(panic::validator_for_specific_item(meta.path(), ITEM))
}
}