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|
//! # crimp
//!
//! This library provides a simplified API over the [cURL Rust
//! bindings][] that resemble that of higher-level libraries such as
//! [reqwest][].
//!
//! `crimp` is intended to be used in situations where HTTP client
//! functionality is desired without adding a significant number of
//! dependencies or sacrificing too much usability.
//!
//! [cURL Rust bindings]: https://docs.rs/curl
//! [reqwest]: https://docs.rs/reqwest
extern crate curl;
extern crate serde;
extern crate serde_json;
use curl::easy::{Easy, List, ReadError};
use serde::Serialize;
use serde::de::DeserializeOwned;
use std::collections::HashMap;
use std::io::Write;
use std::string::{FromUtf8Error, ToString};
#[cfg(test)]
mod tests;
type CurlResult<T> = Result<T, curl::Error>;
/// HTTP method to use for the request.
pub enum Method {
Get, Post, Put, Patch, Delete
}
pub struct Request<'a> {
handle: Easy,
headers: List,
body: Body<'a>,
}
enum Body<'a> {
NoBody,
Json(Vec<u8>),
Bytes {
content_type: &'a str,
data: &'a [u8],
}
}
#[derive(Debug)]
pub struct CurlResponse<T> {
pub status: u32,
pub headers: HashMap<String, String>,
pub body: T,
}
impl <'a> Request<'a> {
/// Initiate an HTTP request with the given method and URL.
pub fn new(method: Method, url: &str) -> CurlResult<Self> {
let mut handle = Easy::new();
handle.url(url)?;
match method {
Method::Get => handle.get(true)?,
Method::Post => handle.post(true)?,
Method::Put => handle.put(true)?,
Method::Patch => handle.custom_request("PATCH")?,
Method::Delete => handle.custom_request("DELETE")?,
}
Ok(Request {
handle,
headers: List::new(),
body: Body::NoBody,
})
}
/// Add a header to a request.
pub fn header(&mut self, k: &str, v: &str) -> CurlResult<&mut Self> {
self.headers.append(&format!("{}: {}", k, v))?;
Ok(self)
}
/// Set the User-Agent for this request.
pub fn user_agent(&mut self, agent: &str) -> CurlResult<&mut Self> {
self.handle.useragent(agent)?;
Ok(self)
}
/// Add a byte-array body to a request using the specified
/// Content-Type.
pub fn body(&'a mut self, content_type: &'a str, data: &'a [u8]) -> &mut Self {
self.body = Body::Bytes { data, content_type };
self
}
/// Add a JSON-encoded body from a serializable type.
pub fn json<T: Serialize>(&'a mut self, body: &T)
-> Result<&mut Self, serde_json::Error> {
let json = serde_json::to_vec(body)?;
self.body = Body::Json(json);
Ok(self)
}
/// Send the HTTP request and return a response structure
/// containing the raw body.
pub fn send(mut self) -> CurlResult<CurlResponse<Vec<u8>>> {
// Create structures in which to store the response data:
let mut headers = HashMap::new();
let mut body = vec![];
// Optionally set content type if a body payload is
// configured.
match self.body {
Body::Json(..) => self.header("Content-Type", "application/json"),
Body::Bytes { content_type, .. } => self.header("Content-Type", content_type),
Body::NoBody => Ok(&mut self),
}?;
// Configure headers on the request:
self.handle.http_headers(self.headers)?;
{
// Take a scoped transfer from the Easy handle. This makes it
// possible to write data into the above local buffers without
// fighting the borrow-checker:
let mut transfer = self.handle.transfer();
// Write the payload if it exists:
match self.body {
Body::Bytes { data, .. } => transfer.read_function(move |mut into| {
into.write_all(data)
.map(|_| data.len())
.map_err(|_| ReadError::Abort)
})?,
Body::Json(json) => transfer.read_function(move |mut into| {
into.write_all(&json)
.map(|_| json.len())
.map_err(|_| ReadError::Abort)
})?,
// Do nothing if there is no body ...
Body::NoBody => {},
};
// Read one header per invocation. Request processing is
// terminated if any header is malformed:
transfer.header_function(|header| {
// Headers are expected to be valid UTF-8 data. If they
// are not, the conversion is lossy.
//
// Technically it is legal for HTTP requests to use
// different encodings, but we don't interface with such
// services for hygienic reasons.
let header = String::from_utf8_lossy(header);
let split = header.splitn(2, ':').collect::<Vec<_>>();
// "Malformed" headers are skipped. In most cases this
// will only be the HTTP version statement.
if split.len() != 2 {
return true;
}
headers.insert(
split[0].trim().to_string(), split[1].trim().to_string()
);
true
})?;
// Read the body to the allocated buffer.
transfer.write_function(|data| {
let len = data.len();
body.write_all(data)
.map(|_| len)
.map_err(|err| panic!("{:?}", err))
})?;
transfer.perform()?;
}
Ok(CurlResponse {
status: self.handle.response_code()?,
headers,
body
})
}
}
impl CurlResponse<Vec<u8>> {
/// Attempt to parse the HTTP response body as a UTF-8 encoded
/// string.
pub fn as_string(self) -> Result<CurlResponse<String>, FromUtf8Error> {
let body = String::from_utf8(self.body)?;
Ok(CurlResponse {
body,
status: self.status,
headers: self.headers,
})
}
/// Attempt to deserialize the HTTP response body from JSON.
pub fn as_json<T: DeserializeOwned>(self) -> Result<CurlResponse<T>, serde_json::Error> {
let deserialized = serde_json::from_slice(&self.body)?;
Ok(CurlResponse {
body: deserialized,
status: self.status,
headers: self.headers,
})
}
}
|
