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use crate::{Field, File};
use actix_web::http::StatusCode;
use actix_web::ResponseError;
use std::str::FromStr;
use thiserror::Error;
#[derive(Debug, Error)]
pub enum Error {
#[error("Text field '{0}' not found")]
TextNotFound(String),
#[error("File upload '{0}' not found")]
FileNotFound(String),
#[error("Text field '{field_name}' couldn't be parsed: {source}")]
ParseError {
field_name: String,
source: Box<dyn std::error::Error + Send>,
},
#[error("Unexpected part found with name '{0}'")]
UnexpectedPart(String),
}
impl ResponseError for Error {
fn status_code(&self) -> StatusCode {
StatusCode::BAD_REQUEST
}
}
#[doc(hidden)]
#[derive(Default)]
pub struct FromFieldConfig {
pub deny_extra_parts: bool,
}
#[doc(hidden)]
pub trait FromField
where
Self: std::marker::Sized,
{
fn from_fields(
fields: Vec<Field>,
config: &FromFieldConfig,
field_name: &str,
) -> Result<Self, Error>;
}
#[doc(hidden)]
pub trait FromFieldExt
where
Self: std::marker::Sized,
{
fn from_fields(
fields: Vec<Field>,
config: &FromFieldConfig,
field_name: &str,
) -> Result<Self, Error>;
}
impl<T, E> FromField for T
where
T: FromStr<Err = E>,
E: std::error::Error + Send + 'static,
{
fn from_fields(
fields: Vec<Field>,
config: &FromFieldConfig,
field_name: &str,
) -> Result<Self, Error> {
let mut matches = Vec::<T>::from_fields(fields, config, field_name)?;
match matches.len() {
0 => Err(Error::TextNotFound(field_name.into())),
1 => Ok(matches.pop().unwrap()),
_ if config.deny_extra_parts => Err(Error::UnexpectedPart(field_name.into())),
_ => Ok(matches.pop().unwrap()),
}
}
}
impl<T, E> FromFieldExt for Option<T>
where
T: FromStr<Err = E>,
E: std::error::Error + Send + 'static,
{
fn from_fields(
fields: Vec<Field>,
config: &FromFieldConfig,
field_name: &str,
) -> Result<Self, Error> {
let mut matches = Vec::<T>::from_fields(fields, config, field_name)?;
match matches.len() {
0 => Ok(None),
1 => Ok(Some(matches.pop().unwrap())),
_ if config.deny_extra_parts => Err(Error::UnexpectedPart(field_name.into())),
_ => Ok(Some(matches.pop().unwrap())),
}
}
}
impl<T, E> FromFieldExt for Vec<T>
where
T: FromStr<Err = E>,
E: std::error::Error + Send + 'static,
{
fn from_fields(
fields: Vec<Field>,
config: &FromFieldConfig,
field_name: &str,
) -> Result<Self, Error> {
let total = fields.len();
let texts = fields
.into_iter()
.filter_map(Field::text)
.map(|text| {
T::from_str(&text.text).map_err(|source| Error::ParseError {
field_name: field_name.to_string(),
source: Box::new(source),
})
})
.collect::<Result<Vec<_>, _>>()?;
if config.deny_extra_parts && texts.len() < total {
return Err(Error::UnexpectedPart(field_name.to_string()));
}
Ok(texts)
}
}
impl FromField for File {
fn from_fields(
fields: Vec<Field>,
config: &FromFieldConfig,
field_name: &str,
) -> Result<Self, Error> {
let mut matches = Vec::<File>::from_fields(fields, config, field_name)?;
match matches.len() {
0 => Err(Error::FileNotFound(field_name.into())),
1 => Ok(matches.pop().unwrap()),
_ if config.deny_extra_parts => Err(Error::UnexpectedPart(field_name.into())),
_ => Ok(matches.pop().unwrap()),
}
}
}
impl FromFieldExt for Option<File> {
fn from_fields(
fields: Vec<Field>,
config: &FromFieldConfig,
field_name: &str,
) -> Result<Self, Error> {
let mut matches = Vec::<File>::from_fields(fields, config, field_name)?;
match matches.len() {
0 => Ok(None),
1 => Ok(Some(matches.pop().unwrap())),
_ if config.deny_extra_parts => Err(Error::UnexpectedPart(field_name.into())),
_ => Ok(Some(matches.pop().unwrap())),
}
}
}
impl FromFieldExt for Vec<File> {
fn from_fields(
fields: Vec<Field>,
config: &FromFieldConfig,
field_name: &str,
) -> Result<Self, Error> {
let total = fields.len();
let files = fields
.into_iter()
.filter_map(Field::file)
.collect::<Vec<_>>();
if config.deny_extra_parts && files.len() < total {
return Err(Error::UnexpectedPart(field_name.to_string()));
}
Ok(files)
}
}
