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use super::body::{Body, BodyKind};
use super::{Error, ErrorKind, Result};
use mime::Mime;
use multipart::client as mp;
use std::fmt;
use std::io::{copy, prelude::*, Cursor, Error as IoError, Result as IoResult};
#[derive(Debug, Clone)]
pub struct MultipartFile<'key, 'data> {
name: &'key str,
file: &'data [u8],
filename: Option<&'key str>,
mime: Option<Mime>,
}
impl<'key, 'data> MultipartFile<'key, 'data> {
pub fn new(name: &'key str, file: &'data [u8]) -> Self {
Self {
name,
file,
filename: None,
mime: None,
}
}
pub fn with_type(self, mime_type: impl AsRef<str>) -> Result<Self> {
let mime_str = mime_type.as_ref();
let mime: Mime = match mime_str.parse() {
Ok(mime) => mime,
Err(error) => return Err(Error(Box::new(ErrorKind::InvalidMimeType(error.to_string())))),
};
Ok(Self {
mime: Some(mime),
..self
})
}
pub fn with_filename(self, filename: &'key str) -> Self {
Self {
filename: Some(filename),
..self
}
}
}
#[derive(Debug, Clone, Default)]
pub struct MultipartBuilder<'key, 'data> {
text: Vec<(&'key str, &'data str)>,
files: Vec<MultipartFile<'key, 'data>>,
}
impl<'key, 'data> MultipartBuilder<'key, 'data> {
pub fn new() -> Self {
Self::default()
}
pub fn with_text(mut self, name: &'key str, text: &'data str) -> Self {
self.text.push((name, text));
self
}
pub fn with_file(mut self, file: MultipartFile<'key, 'data>) -> Self {
self.files.push(file);
self
}
pub fn build(self) -> Result<Multipart<'data>> {
let mut mp = mp::lazy::Multipart::new();
for (k, v) in self.text {
mp.add_text(k, v);
}
for file in self.files {
mp.add_stream(file.name, Cursor::new(file.file), file.filename, file.mime);
}
let prepared = mp.prepare().map_err::<IoError, _>(Into::into)?;
Ok(Multipart { data: prepared })
}
}
pub struct Multipart<'data> {
data: mp::lazy::PreparedFields<'data>,
}
impl Body for Multipart<'_> {
fn kind(&mut self) -> IoResult<BodyKind> {
Ok(BodyKind::Chunked)
}
fn write<W: Write>(&mut self, mut writer: W) -> IoResult<()> {
copy(&mut self.data, &mut writer)?;
Ok(())
}
fn content_type(&mut self) -> IoResult<Option<String>> {
Ok(Some(format!("multipart/form-data; boundary={}", self.data.boundary())))
}
}
impl fmt::Debug for Multipart<'_> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_struct("Multipart").finish()
}
}