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use crate::{connection::HttpStream, Error};
use std::collections::HashMap;
use std::io::{Bytes, Read};
use std::str;
#[derive(Clone, Copy, PartialEq, Debug)]
enum StringValidityState {
Unchecked,
CheckedValid,
CheckedInvalid(str::Utf8Error),
}
#[derive(Clone, PartialEq, Debug)]
pub struct Response {
pub status_code: i32,
pub reason_phrase: String,
pub headers: HashMap<String, String>,
body: Vec<u8>,
body_str_state: std::cell::Cell<StringValidityState>,
}
impl Response {
pub(crate) fn create(mut parent: ResponseLazy, is_head: bool) -> Result<Response, Error> {
let mut body = Vec::new();
if !is_head {
for byte in &mut parent {
let (byte, length) = byte?;
body.reserve(length);
body.push(byte);
}
}
let ResponseLazy {
status_code,
reason_phrase,
headers,
..
} = parent;
Ok(Response {
status_code,
reason_phrase,
headers,
body,
body_str_state: std::cell::Cell::new(StringValidityState::Unchecked),
})
}
pub fn as_str(&self) -> Result<&str, Error> {
use StringValidityState::*;
match self.body_str_state.get() {
Unchecked => match str::from_utf8(&self.body) {
Ok(s) => {
self.body_str_state.set(CheckedValid);
Ok(s)
}
Err(err) => {
self.body_str_state.set(CheckedInvalid(err));
Err(Error::InvalidUtf8InBody(err))
}
},
CheckedValid => unsafe { Ok(str::from_utf8_unchecked(&self.body)) },
CheckedInvalid(err) => Err(Error::InvalidUtf8InBody(err)),
}
}
pub fn as_bytes(&self) -> &[u8] {
&self.body
}
pub fn into_bytes(self) -> Vec<u8> {
self.body
}
#[cfg(feature = "json-using-serde")]
pub fn json<'a, T>(&'a self) -> Result<T, Error>
where
T: serde::de::Deserialize<'a>,
{
let str = match self.as_str() {
Ok(str) => str,
Err(_) => return Err(Error::InvalidUtf8InResponse),
};
match serde_json::from_str(str) {
Ok(json) => Ok(json),
Err(err) => Err(Error::SerdeJsonError(err)),
}
}
}
pub struct ResponseLazy {
pub status_code: i32,
pub reason_phrase: String,
pub headers: HashMap<String, String>,
stream: Bytes<HttpStream>,
content_length: Option<usize>,
chunked: bool,
chunks_done: bool,
}
impl ResponseLazy {
pub(crate) fn from_stream(stream: HttpStream) -> Result<ResponseLazy, Error> {
let mut stream = stream.bytes();
let ResponseMetadata {
status_code,
reason_phrase,
headers,
chunked,
content_length,
} = read_metadata(&mut stream)?;
Ok(ResponseLazy {
status_code,
reason_phrase,
headers,
content_length,
stream,
chunked,
chunks_done: false,
})
}
}
impl Iterator for ResponseLazy {
type Item = Result<(u8, usize), Error>;
fn next(&mut self) -> Option<Self::Item> {
if self.chunked {
if self.chunks_done {
return None;
}
if let Some(content_length) = self.content_length {
if content_length == 0 {
let count_line = match read_line(&mut self.stream) {
Ok(line) => line,
Err(err) => return Some(Err(err)),
};
match usize::from_str_radix(&count_line, 16) {
Ok(incoming_count) => {
if incoming_count == 0 {
self.chunks_done = true;
return None;
}
self.content_length = Some(incoming_count);
}
Err(_) => return Some(Err(Error::MalformedChunkLength)),
}
}
} else {
return Some(Err(Error::Other(
"content length was None in a chunked transfer",
)));
}
}
if let Some(content_length) = self.content_length {
if content_length > 0 {
self.content_length = Some(content_length - 1);
if let Some(byte) = self.stream.next() {
match byte {
Ok(byte) => {
if self.chunked && content_length - 1 == 0 {
if let Err(err) = read_line(&mut self.stream) {
return Some(Err(err));
}
}
return Some(Ok((byte, content_length)));
}
Err(err) => return Some(Err(Error::IoError(err))),
}
}
}
} else {
if let Some(byte) = self.stream.next() {
match byte {
Ok(byte) => return Some(Ok((byte, 1))),
Err(err) => return Some(Err(Error::IoError(err))),
}
}
}
None
}
}
struct ResponseMetadata {
status_code: i32,
reason_phrase: String,
headers: HashMap<String, String>,
chunked: bool,
content_length: Option<usize>,
}
fn read_metadata(stream: &mut Bytes<HttpStream>) -> Result<ResponseMetadata, Error> {
let (status_code, reason_phrase) = parse_status_line(read_line(stream)?);
let mut headers = HashMap::new();
let mut chunked = false;
let mut content_length = None;
loop {
let line = read_line(stream)?;
if line.len() == 0 {
break;
}
if let Some(header) = parse_header(line) {
if !chunked
&& header.0.to_lowercase().trim() == "transfer-encoding"
&& header.1.to_lowercase().trim() == "chunked"
{
chunked = true;
content_length = Some(0);
}
if content_length.is_none() && header.0.to_lowercase().trim() == "content-length" {
match str::parse::<usize>(&header.1.trim()) {
Ok(length) => content_length = Some(length),
Err(_) => return Err(Error::MalformedContentLength),
}
}
headers.insert(header.0, header.1);
}
}
Ok(ResponseMetadata {
status_code,
reason_phrase,
headers,
chunked,
content_length,
})
}
fn read_line(stream: &mut Bytes<HttpStream>) -> Result<String, Error> {
let mut bytes = Vec::with_capacity(32);
for byte in stream {
match byte {
Ok(byte) => {
if byte == b'\n' {
bytes.pop();
break;
} else {
bytes.push(byte);
}
}
Err(err) => {
return Err(Error::IoError(err));
}
}
}
match String::from_utf8(bytes) {
Ok(line) => Ok(line.to_string()),
Err(_) => Err(Error::InvalidUtf8InResponse),
}
}
fn parse_status_line(line: String) -> (i32, String) {
let mut split = line.split(' ');
if let Some(code) = split.nth(1) {
if let Ok(code) = code.parse::<i32>() {
if let Some(reason) = split.next() {
return (code, reason.to_string());
}
}
}
(503, "Server did not provide a status line".to_owned())
}
fn parse_header(mut line: String) -> Option<(String, String)> {
if let Some(location) = line.find(':') {
let value = line.split_off(location + 2);
line.truncate(location);
return Some((line, value));
}
None
}