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use super::{Client, Result};
use std::io::{copy, Read, Write};
use std::str::FromStr;
use drawbridge_type::digest::{Algorithms, ContentDigest};
use drawbridge_type::Meta;
use anyhow::{anyhow, bail, Context};
use http::header::{CONTENT_LENGTH, CONTENT_TYPE};
use http::StatusCode;
use mime::Mime;
use ureq::serde::{Deserialize, Serialize};
use ureq::{Request, Response};
fn parse_header<T>(req: &Response, name: &str) -> Result<T>
where
T: FromStr,
T::Err: 'static + Sync + Send + std::error::Error,
{
req.header(name)
.ok_or_else(|| anyhow!("missing `{name}` header"))?
.parse()
.context(format!("failed to parse `{name}` header"))
}
#[derive(Clone, Debug)]
pub struct Entity<'a> {
client: &'a Client,
path: String,
}
fn parse_ureq_error(e: ureq::Error) -> anyhow::Error {
match e {
ureq::Error::Status(code, msg) => match msg.into_string() {
Ok(msg) if !msg.is_empty() => {
anyhow!(msg).context(format!("request failed with status code `{code}`"))
}
_ => anyhow!("request failed with status code `{code}`"),
},
ureq::Error::Transport(e) => anyhow::Error::new(e).context("transport layer failure"),
}
}
impl<'a> Entity<'a> {
pub fn new(client: &'a Client) -> Self {
Self {
client,
path: Default::default(),
}
}
pub fn child(&self, path: &str) -> Self {
Self {
client: self.client,
path: format!("{}/{}", self.path, path),
}
}
pub(super) fn create_request(&self, hash: &ContentDigest, mime: &Mime) -> Result<Request> {
let token = self.client.token.as_ref().ok_or_else(|| {
anyhow!("endpoint requires authorization, but no token was configured")
})?;
let url = self.client.url(&self.path)?;
Ok(self
.client
.inner
.put(url.as_str())
.set("Authorization", &format!("Bearer {token}"))
.set("Content-Digest", &hash.to_string())
.set(CONTENT_TYPE.as_str(), mime.as_ref()))
}
pub(super) fn create_bytes(&self, mime: &Mime, data: impl AsRef<[u8]>) -> Result<bool> {
let data = data.as_ref();
let (n, hash) = Algorithms::default()
.read_sync(data)
.context("failed to compute content digest")?;
if n != data.len() as u64 {
bail!(
"invalid amount of bytes read, expected: {}, got {n}",
data.len(),
)
}
let res = self
.create_request(&hash, mime)?
.send_bytes(data)
.map_err(parse_ureq_error)?;
match StatusCode::from_u16(res.status()) {
Ok(StatusCode::CREATED) => Ok(true),
Ok(StatusCode::OK) => Ok(false),
_ => bail!("unexpected status code: {}", res.status()),
}
}
pub(super) fn create_json(&self, mime: &Mime, val: &impl Serialize) -> Result<bool> {
let buf = serde_json::to_vec(val).context("failed to encode value to JSON")?;
self.create_bytes(mime, buf)
}
pub(super) fn create_from(
&self,
Meta { hash, size, mime }: &Meta,
rdr: impl Read,
) -> Result<bool> {
let res = self
.create_request(hash, mime)?
.set(CONTENT_LENGTH.as_str(), &size.to_string())
.send(rdr)
.map_err(parse_ureq_error)?;
match StatusCode::from_u16(res.status()) {
Ok(StatusCode::CREATED) => Ok(true),
Ok(StatusCode::OK) => Ok(false),
_ => bail!("unexpected status code: {}", res.status()),
}
}
pub fn get(&self) -> Result<(u64, Mime, impl Read)> {
let url = self.client.url(&self.path)?;
let mut req = self.client.inner.get(url.as_str());
if let Some(ref token) = self.client.token {
req = req.set("Authorization", &format!("Bearer {token}"))
}
let res = req
.call()
.map_err(parse_ureq_error)
.context("GET request failed")?;
let hash: ContentDigest = parse_header(&res, "Content-Digest")?;
let mime = parse_header(&res, CONTENT_TYPE.as_str())?;
let size = parse_header(&res, CONTENT_LENGTH.as_str())?;
match StatusCode::from_u16(res.status()) {
Ok(StatusCode::OK) => Ok((size, mime, hash.verifier(res.into_reader().take(size)))),
_ => bail!("unexpected status code: {}", res.status()),
}
}
pub fn get_to(&self, dst: &mut impl Write) -> Result<(u64, Mime)> {
let (size, mime, mut rdr) = self.get()?;
let n = copy(&mut rdr, dst)?;
if n != size {
bail!(
"invalid amount of bytes read, expected {}, read {}",
size,
n,
)
}
Ok((size, mime))
}
pub fn get_json<T>(&self) -> Result<T>
where
for<'de> T: Deserialize<'de>,
{
let (_, _, rdr) = self.get()?;
serde_json::from_reader(rdr).context("failed to decode JSON")
}
pub fn get_bytes(&self) -> Result<(Mime, Vec<u8>)> {
let (size, mime, mut rdr) = self.get()?;
let mut buf =
Vec::with_capacity(size.try_into().context("failed to convert u64 to usize")?);
let n = copy(&mut rdr, &mut buf).context("I/O failure")?;
if n != size {
bail!(
"invalid amount of bytes read, expected {}, read {}",
size,
n,
)
};
Ok((mime, buf))
}
pub fn get_string(&self) -> Result<(Mime, String)> {
let (size, mime, mut rdr) = self.get()?;
let size = size.try_into().context("failed to convert u64 to usize")?;
let mut s = String::with_capacity(size);
let n = rdr.read_to_string(&mut s).context("I/O failure")?;
if n != size {
bail!(
"invalid amount of bytes read, expected {}, read {}",
size,
n,
)
};
Ok((mime, s))
}
}
