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use crate::{body::Body, error::SaphirError, request::Request};
use http::Method;
use regex::Regex;
use std::{
collections::{HashMap, HashSet, VecDeque},
iter::FromIterator,
str::FromStr,
sync::atomic::AtomicU64,
};
static ENDPOINT_ID: AtomicU64 = AtomicU64::new(0);
pub enum EndpointResolverResult {
InvalidPath,
MethodNotAllowed,
Match,
}
pub struct EndpointResolver {
path_matcher: UriPathMatcher,
methods: HashSet<Method>,
id: u64,
allow_any_method: bool,
}
impl EndpointResolver {
pub fn new(path_str: &str, method: Method) -> Result<EndpointResolver, SaphirError> {
let mut methods = HashSet::new();
let allow_any_method = method.is_any();
if !allow_any_method {
methods.insert(method);
}
Ok(EndpointResolver {
path_matcher: UriPathMatcher::new(path_str).map_err(SaphirError::Other)?,
methods,
id: ENDPOINT_ID.fetch_add(1, std::sync::atomic::Ordering::SeqCst),
allow_any_method,
})
}
pub fn add_method(&mut self, m: Method) {
if !self.allow_any_method && m.is_any() {
self.allow_any_method = true;
} else {
self.methods.insert(m);
}
}
pub fn resolve(&self, req: &mut Request<Body>) -> EndpointResolverResult {
let path = req.uri().path().to_string();
if self.path_matcher.match_all_and_capture(path, req.captures_mut()) {
if self.allow_any_method || self.methods.contains(req.method()) {
EndpointResolverResult::Match
} else {
EndpointResolverResult::MethodNotAllowed
}
} else {
EndpointResolverResult::InvalidPath
}
}
pub fn id(&self) -> u64 {
self.id
}
}
#[derive(Debug)]
pub(crate) enum UriPathMatcher {
Simple {
inner: Vec<UriPathSegmentMatcher>,
},
Wildcard {
start: Vec<UriPathSegmentMatcher>,
end: VecDeque<UriPathSegmentMatcher>,
wildcard_capture_name: Option<String>,
},
}
impl UriPathMatcher {
pub fn new(path_str: &str) -> Result<UriPathMatcher, String> {
let uri_path_matcher = if path_str.contains("**") || path_str.contains("..") {
let segments = path_str.split('/').collect::<Vec<_>>();
let mut wildcard_capture_name = None;
let split_at = segments
.iter()
.position(|seg| {
if seg.contains("**") || seg.contains("..") {
let trimmed = seg.trim_start_matches("**").trim_start_matches("..");
if !trimmed.is_empty() {
wildcard_capture_name = Some(trimmed.to_string());
}
return true;
}
false
})
.ok_or_else(|| "Unable to locate wildcard".to_string())?;
let (s1, s2) = segments.split_at(split_at);
let s2 = &s2[1..s2.len()];
UriPathMatcher::Wildcard {
start: Self::parse_segments(s1.iter())?,
end: Self::parse_segments(s2.iter())?,
wildcard_capture_name,
}
} else {
UriPathMatcher::Simple {
inner: Self::parse_segments(path_str.split('/'))?,
}
};
Ok(uri_path_matcher)
}
fn parse_segments<C, I, A>(segments: I) -> Result<C, String>
where
I: Iterator<Item = A>,
A: AsRef<str>,
C: FromIterator<UriPathSegmentMatcher>,
{
let mut last_err = None;
let inner = segments
.filter_map(|ps| {
if ps.as_ref().is_empty() {
return None;
}
match UriPathSegmentMatcher::new(ps.as_ref()) {
Ok(seg_matcher) => Some(seg_matcher),
Err(e) => {
last_err = Some(e);
None
}
}
})
.collect::<C>();
if let Some(e) = last_err {
return Err(e);
}
Ok(inner)
}
pub fn match_non_exhaustive(&self, path: &str) -> bool {
let mut path_split = path.trim_start_matches('/').split('/').collect();
match self {
UriPathMatcher::Simple { inner } => Self::match_start(inner, &mut path_split),
UriPathMatcher::Wildcard { start, end, .. } => Self::match_start(start, &mut path_split) && Self::match_end(end, &mut path_split),
}
}
fn match_start(semgents_matcher: &[UriPathSegmentMatcher], path_segments: &mut VecDeque<&str>) -> bool {
for segment in semgents_matcher {
if let Some(ref s) = path_segments.pop_front() {
if !segment.matches(s) {
return false;
}
} else {
return false;
}
}
true
}
fn match_end(semgents_matcher: &VecDeque<UriPathSegmentMatcher>, path_segments: &mut VecDeque<&str>) -> bool {
let mut s_iter = semgents_matcher.iter();
while let Some(segment) = s_iter.next_back() {
if let Some(ref s) = path_segments.pop_back() {
if !segment.matches(s) {
return false;
}
} else {
return false;
}
}
true
}
pub fn match_all_and_capture(&self, path: String, captures: &mut HashMap<String, String>) -> bool {
let mut path_segments = path.split('/').collect::<VecDeque<_>>();
path_segments.pop_front();
if path_segments.back().map(|s| s.len()).unwrap_or(0) < 1 {
path_segments.pop_back();
}
match self {
UriPathMatcher::Simple { inner } => {
if inner.len() != path_segments.len() {
return false;
}
{
let mut path_segments = path_segments.iter();
for seg in inner.iter() {
if let Some(¤t) = path_segments.next() {
if !seg.matches(current) {
return false;
}
} else {
return false;
}
}
}
{
for seg in inner {
if let Some(current) = path_segments.pop_front() {
if let Some(name) = seg.name() {
captures.insert(name.to_string(), current.to_string());
}
}
}
}
true
}
UriPathMatcher::Wildcard {
start,
end,
wildcard_capture_name,
} => {
let mut segments = path_segments.clone();
if Self::match_start(start, &mut segments) && Self::match_end(end, &mut segments) {
if let Some(name) = wildcard_capture_name {
let value = segments.iter().map(|&s| format!("/{}", s)).collect();
captures.insert(name.clone(), value);
}
} else {
return false;
}
{
for seg in start {
if let Some(current) = path_segments.pop_front() {
if let Some(name) = seg.name() {
captures.insert(name.to_string(), current.to_string());
}
}
}
let mut end_iter = end.iter();
while let Some(seg) = end_iter.next_back() {
if let Some(current) = path_segments.pop_back() {
if let Some(name) = seg.name() {
captures.insert(name.to_string(), current.to_string());
}
}
}
}
true
}
}
}
}
#[derive(Debug)]
pub(crate) enum UriPathSegmentMatcher {
Static { segment: String },
Variable { name: Option<String> },
Custom { name: Option<String>, segment: Regex },
Wildcard { prefix: Option<String>, suffix: Option<String> },
}
impl UriPathSegmentMatcher {
const SEGMENT_VARIABLE_CLOSING_CHARS: &'static [char] = &['}', '>'];
const SEGMENT_VARIABLE_OPENING_CHARS: &'static [char] = &['{', '<'];
pub fn new(segment: &str) -> Result<UriPathSegmentMatcher, String> {
if segment.contains('/') {
return Err("A path segment should not contain any /".to_string());
}
if segment.contains('*') {
let mut segment_split = segment.splitn(2, '*');
Ok(UriPathSegmentMatcher::Wildcard {
prefix: segment_split.next().filter(|s| !s.is_empty()).map(|s| s.to_string()),
suffix: segment_split.next().filter(|s| !s.is_empty()).map(|s| s.to_string()),
})
} else if segment.starts_with(Self::SEGMENT_VARIABLE_OPENING_CHARS) && segment.ends_with(Self::SEGMENT_VARIABLE_CLOSING_CHARS) {
let s: Vec<&str> = segment[1..segment.len() - 1].splitn(2, "#r").collect();
if s.is_empty() {
return Err("No name was provided for a variable segment".to_string());
}
let name = if s[0].starts_with('_') { None } else { Some(s[0].to_string()) };
let name_c = name.clone();
s.get(1)
.map(|r| {
let r = r.trim_start_matches('(').trim_end_matches(')');
Regex::new(r)
.map_err(|e| e.to_string())
.map(|r| UriPathSegmentMatcher::Custom { name, segment: r })
})
.unwrap_or_else(|| Ok(UriPathSegmentMatcher::Variable { name: name_c }))
} else {
Ok(UriPathSegmentMatcher::Static { segment: segment.to_string() })
}
}
#[inline]
pub fn matches(&self, other: &str) -> bool {
match self {
UriPathSegmentMatcher::Static { segment: ref s } => s.eq(other),
UriPathSegmentMatcher::Variable { .. } => true,
UriPathSegmentMatcher::Custom { segment: ref s, .. } => s.is_match(other),
UriPathSegmentMatcher::Wildcard { prefix, suffix } => {
prefix.as_ref().filter(|prefix| !other.starts_with(prefix.as_str())).is_none()
&& suffix.as_ref().filter(|suffix| !other.ends_with(suffix.as_str())).is_none()
}
}
}
#[inline]
pub fn name(&self) -> Option<&str> {
match self {
UriPathSegmentMatcher::Static { .. } => None,
UriPathSegmentMatcher::Variable { name: ref n } => n.as_ref().map(|s| s.as_str()),
UriPathSegmentMatcher::Custom { name: ref n, .. } => n.as_ref().map(|s| s.as_str()),
UriPathSegmentMatcher::Wildcard { .. } => None,
}
}
}
pub trait MethodExtension {
fn any() -> Self;
fn is_any(&self) -> bool;
}
impl MethodExtension for Method {
#[inline]
fn any() -> Self {
Method::from_str("ANY").expect("This is a valid method str")
}
fn is_any(&self) -> bool {
self.as_str() == "ANY"
}
}