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use std::fmt::Debug;
use std::io::{Error, ErrorKind, Result};
use std::convert::TryFrom;
use url::Url;
use md5::compute as md5;
pub trait RequestParams {
fn method(&self) -> &str;
fn append_to(&self, url: &mut Url);
fn needs_signature(&self) -> bool;
fn needs_session_key(&self) -> bool;
}
#[derive(Debug)]
pub struct Request<'rq, T>
where
T: RequestParams + Debug,
{
pub base_url: &'rq str,
pub api_key: &'rq str,
pub secret: Option<&'rq str>,
pub session: Option<&'rq str>,
pub params: T,
}
impl<'rq, T> Request<'rq, T>
where
T: RequestParams + Debug,
{
pub fn new(
base_url: &'rq str,
api_key: &'rq str,
secret: Option<&'rq str>,
session: Option<&'rq str>,
params: T
) -> Request<'rq, T> {
Request { base_url, api_key, secret, session, params }
}
pub fn get_url(&self) -> Result<Url> {
let mut url = self.make_url()?;
if self.params.needs_session_key() {
url = self.append_session_key(url)?;
}
if self.params.needs_signature() {
url = self.sign_url(url)?;
}
Ok(url)
}
fn make_url(&self) -> Result<Url> {
let mut url = Url::parse(self.base_url)
.map_err(|e| Error::new(ErrorKind::InvalidInput, e))?;
{
let mut query = url.query_pairs_mut();
query.append_pair("api_key", self.api_key);
query.append_pair("format", "json");
query.append_pair("method", self.params.method());
}
self.params.append_to(&mut url);
Ok(url)
}
fn append_session_key(&self, mut base: Url) -> Result<Url> {
let sk = self.session.ok_or(
Error::new(ErrorKind::InvalidInput, "Missing session key"))?;
{
let mut query = base.query_pairs_mut();
query.append_pair("sk", sk);
}
Ok(base)
}
fn sign_url(&self, mut base: Url) -> Result<Url> {
let mut signature = {
let mut pairs = base.query_pairs()
.filter(|&(ref name, _)| name != "format" && name != "callback")
.collect::<Vec<_>>();
pairs.sort_unstable();
pairs.into_iter().fold(String::new(), |mut acc, (ref n, ref v)| {
acc.push_str(n);
acc.push_str(v);
acc
})
};
signature.push_str(self.secret.ok_or(
Error::new(ErrorKind::InvalidInput,
"All methods that need signature also need secret")
)?);
let digest = format!("{:x}", md5(signature));
base.query_pairs_mut().append_pair("api_sig", &digest);
Ok(base)
}
}
impl<'rq, T> TryFrom<Request<'rq, T>> for Url
where
T: RequestParams + Debug
{
type Error = Error;
fn try_from(rq: Request<'rq, T>) -> Result<Url> {
rq.get_url()
}
}
#[macro_export]
macro_rules! cv {
($what:ident) => { &$what.to_string() }
}
#[macro_export]
macro_rules! params {
(
$to:ident,
[$($rqn:ident: $rqe:expr),*],
[$($opn:ident: $ope:expr),*]
) => {
$( $to.append_pair(stringify!($rqn), $rqe); )*
$( if let Some($opn) = $opn { $to.append_pair(stringify!($opn), $ope); }; )*
}
}