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matcher.go
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/
matcher.go
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package lion
import (
"net/http"
"strings"
"github.com/celrenheit/lion/internal/matcher"
)
// RegisterMatcher registers and matches routes to Handlers
type registerMatcher interface {
Register(method, pattern string, handler http.Handler) *route
Match(*ctx, *http.Request) (*ctx, http.Handler)
Path(pattern string, params map[string]string) (string, error)
}
////////////////////////////////////////////////////////////////////////////
/// RADIX ///
////////////////////////////////////////////////////////////////////////////
var _ registerMatcher = (*pathMatcher)(nil)
type pathMatcher struct {
matcher matcher.Matcher
}
func newPathMatcher() *pathMatcher {
cfg := &matcher.Config{
ParamChar: ':',
WildcardChar: '*',
Separators: "/.",
New: func() matcher.Store {
return &route{}
},
}
r := &pathMatcher{
matcher: matcher.Custom(cfg),
}
return r
}
func (d *pathMatcher) Register(method, pattern string, handler http.Handler) *route {
d.prevalidation(method, pattern)
rt := d.matcher.Set(pattern, handler, matcher.Tags{method})
return rt.(*route)
}
func (d *pathMatcher) Match(c *ctx, r *http.Request) (*ctx, http.Handler) {
p := cleanPath(r.URL.Path)
c.tags[0] = r.Method
h, err := d.matcher.GetWithContext(c, p, c.tags)
if err == matcher.ErrTSR {
if p[len(p)-1] == '/' {
p = p[:len(p)-1]
} else {
p = p + "/"
}
return c, wrap(func(c Context) {
c.WithStatus(http.StatusMovedPermanently).
Redirect(p)
})
}
if err == matcher.ErrNotFound {
return c, nil
}
if err == matcher.ErrTagsNotAllowed {
// Automatic OPTIONS
if r.Method == OPTIONS {
hh := d.automaticOptionsHandler(c, p)
return c, hh
}
// Method not allowed
return c, wrap(func(c Context) {
c.Error(ErrorMethodNotAllowed)
})
}
return c, h.(http.Handler)
}
func (d *pathMatcher) prevalidation(method, pattern string) {
if len(pattern) == 0 || pattern[0] != '/' {
panicl("path must begin with '/' in path '" + pattern + "'")
}
// Is http method allowed
if !isInStringSlice(allowedHTTPMethods[:], method) {
panicl("lion: invalid http method => %s\n\tShould be one of %v", method, allowedHTTPMethods)
}
}
func (d *pathMatcher) automaticOptionsHandler(c *ctx, path string) http.Handler {
allowed := make([]string, 0, len(allowedHTTPMethods))
for _, method := range allowedHTTPMethods {
if method == OPTIONS {
continue
}
c.tags[0] = method
h, _ := d.matcher.GetWithContext(c, path, c.tags)
if h != nil {
allowed = append(allowed, method)
}
}
if len(allowed) == 0 { // There is no method allowed
return nil
}
allowed = append(allowed, OPTIONS)
joined := strings.Join(allowed, ",")
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Accept", joined)
w.WriteHeader(http.StatusOK)
})
}
func (d *pathMatcher) Path(pattern string, params map[string]string) (string, error) {
return d.matcher.Eval(pattern, params)
}
func isInStringSlice(slice []string, expected string) bool {
for _, val := range slice {
if val == expected {
return true
}
}
return false
}