mirror of
https://github.com/vbatts/imgsrv.git
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710 lines
20 KiB
Go
710 lines
20 KiB
Go
// Copyright 2012 The Gorilla Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package mux
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import (
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"errors"
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"fmt"
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"net/http"
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"net/url"
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"regexp"
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"strings"
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)
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// Route stores information to match a request and build URLs.
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type Route struct {
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// Request handler for the route.
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handler http.Handler
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// If true, this route never matches: it is only used to build URLs.
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buildOnly bool
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// The name used to build URLs.
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name string
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// Error resulted from building a route.
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err error
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// "global" reference to all named routes
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namedRoutes map[string]*Route
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// config possibly passed in from `Router`
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routeConf
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}
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// SkipClean reports whether path cleaning is enabled for this route via
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// Router.SkipClean.
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func (r *Route) SkipClean() bool {
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return r.skipClean
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}
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// Match matches the route against the request.
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func (r *Route) Match(req *http.Request, match *RouteMatch) bool {
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if r.buildOnly || r.err != nil {
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return false
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}
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var matchErr error
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// Match everything.
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for _, m := range r.matchers {
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if matched := m.Match(req, match); !matched {
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if _, ok := m.(methodMatcher); ok {
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matchErr = ErrMethodMismatch
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continue
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}
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// Ignore ErrNotFound errors. These errors arise from match call
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// to Subrouters.
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//
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// This prevents subsequent matching subrouters from failing to
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// run middleware. If not ignored, the middleware would see a
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// non-nil MatchErr and be skipped, even when there was a
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// matching route.
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if match.MatchErr == ErrNotFound {
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match.MatchErr = nil
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}
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matchErr = nil
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return false
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}
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}
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if matchErr != nil {
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match.MatchErr = matchErr
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return false
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}
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if match.MatchErr == ErrMethodMismatch {
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// We found a route which matches request method, clear MatchErr
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match.MatchErr = nil
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// Then override the mis-matched handler
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match.Handler = r.handler
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}
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// Yay, we have a match. Let's collect some info about it.
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if match.Route == nil {
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match.Route = r
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}
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if match.Handler == nil {
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match.Handler = r.handler
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}
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if match.Vars == nil {
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match.Vars = make(map[string]string)
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}
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// Set variables.
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r.regexp.setMatch(req, match, r)
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return true
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}
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// ----------------------------------------------------------------------------
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// Route attributes
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// ----------------------------------------------------------------------------
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// GetError returns an error resulted from building the route, if any.
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func (r *Route) GetError() error {
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return r.err
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}
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// BuildOnly sets the route to never match: it is only used to build URLs.
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func (r *Route) BuildOnly() *Route {
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r.buildOnly = true
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return r
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}
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// Handler --------------------------------------------------------------------
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// Handler sets a handler for the route.
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func (r *Route) Handler(handler http.Handler) *Route {
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if r.err == nil {
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r.handler = handler
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}
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return r
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}
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// HandlerFunc sets a handler function for the route.
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func (r *Route) HandlerFunc(f func(http.ResponseWriter, *http.Request)) *Route {
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return r.Handler(http.HandlerFunc(f))
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}
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// GetHandler returns the handler for the route, if any.
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func (r *Route) GetHandler() http.Handler {
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return r.handler
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}
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// Name -----------------------------------------------------------------------
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// Name sets the name for the route, used to build URLs.
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// It is an error to call Name more than once on a route.
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func (r *Route) Name(name string) *Route {
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if r.name != "" {
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r.err = fmt.Errorf("mux: route already has name %q, can't set %q",
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r.name, name)
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}
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if r.err == nil {
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r.name = name
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r.namedRoutes[name] = r
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}
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return r
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}
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// GetName returns the name for the route, if any.
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func (r *Route) GetName() string {
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return r.name
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}
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// ----------------------------------------------------------------------------
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// Matchers
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// ----------------------------------------------------------------------------
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// matcher types try to match a request.
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type matcher interface {
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Match(*http.Request, *RouteMatch) bool
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}
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// addMatcher adds a matcher to the route.
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func (r *Route) addMatcher(m matcher) *Route {
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if r.err == nil {
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r.matchers = append(r.matchers, m)
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}
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return r
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}
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// addRegexpMatcher adds a host or path matcher and builder to a route.
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func (r *Route) addRegexpMatcher(tpl string, typ regexpType) error {
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if r.err != nil {
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return r.err
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}
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if typ == regexpTypePath || typ == regexpTypePrefix {
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if len(tpl) > 0 && tpl[0] != '/' {
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return fmt.Errorf("mux: path must start with a slash, got %q", tpl)
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}
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if r.regexp.path != nil {
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tpl = strings.TrimRight(r.regexp.path.template, "/") + tpl
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}
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}
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rr, err := newRouteRegexp(tpl, typ, routeRegexpOptions{
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strictSlash: r.strictSlash,
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useEncodedPath: r.useEncodedPath,
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})
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if err != nil {
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return err
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}
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for _, q := range r.regexp.queries {
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if err = uniqueVars(rr.varsN, q.varsN); err != nil {
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return err
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}
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}
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if typ == regexpTypeHost {
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if r.regexp.path != nil {
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if err = uniqueVars(rr.varsN, r.regexp.path.varsN); err != nil {
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return err
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}
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}
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r.regexp.host = rr
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} else {
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if r.regexp.host != nil {
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if err = uniqueVars(rr.varsN, r.regexp.host.varsN); err != nil {
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return err
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}
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}
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if typ == regexpTypeQuery {
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r.regexp.queries = append(r.regexp.queries, rr)
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} else {
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r.regexp.path = rr
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}
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}
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r.addMatcher(rr)
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return nil
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}
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// Headers --------------------------------------------------------------------
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// headerMatcher matches the request against header values.
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type headerMatcher map[string]string
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func (m headerMatcher) Match(r *http.Request, match *RouteMatch) bool {
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return matchMapWithString(m, r.Header, true)
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}
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// Headers adds a matcher for request header values.
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// It accepts a sequence of key/value pairs to be matched. For example:
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//
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// r := mux.NewRouter()
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// r.Headers("Content-Type", "application/json",
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// "X-Requested-With", "XMLHttpRequest")
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//
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// The above route will only match if both request header values match.
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// If the value is an empty string, it will match any value if the key is set.
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func (r *Route) Headers(pairs ...string) *Route {
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if r.err == nil {
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var headers map[string]string
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headers, r.err = mapFromPairsToString(pairs...)
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return r.addMatcher(headerMatcher(headers))
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}
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return r
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}
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// headerRegexMatcher matches the request against the route given a regex for the header
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type headerRegexMatcher map[string]*regexp.Regexp
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func (m headerRegexMatcher) Match(r *http.Request, match *RouteMatch) bool {
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return matchMapWithRegex(m, r.Header, true)
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}
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// HeadersRegexp accepts a sequence of key/value pairs, where the value has regex
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// support. For example:
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//
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// r := mux.NewRouter()
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// r.HeadersRegexp("Content-Type", "application/(text|json)",
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// "X-Requested-With", "XMLHttpRequest")
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//
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// The above route will only match if both the request header matches both regular expressions.
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// If the value is an empty string, it will match any value if the key is set.
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// Use the start and end of string anchors (^ and $) to match an exact value.
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func (r *Route) HeadersRegexp(pairs ...string) *Route {
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if r.err == nil {
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var headers map[string]*regexp.Regexp
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headers, r.err = mapFromPairsToRegex(pairs...)
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return r.addMatcher(headerRegexMatcher(headers))
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}
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return r
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}
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// Host -----------------------------------------------------------------------
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// Host adds a matcher for the URL host.
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// It accepts a template with zero or more URL variables enclosed by {}.
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// Variables can define an optional regexp pattern to be matched:
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//
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// - {name} matches anything until the next dot.
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//
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// - {name:pattern} matches the given regexp pattern.
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//
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// For example:
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//
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// r := mux.NewRouter()
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// r.Host("www.example.com")
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// r.Host("{subdomain}.domain.com")
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// r.Host("{subdomain:[a-z]+}.domain.com")
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//
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// Variable names must be unique in a given route. They can be retrieved
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// calling mux.Vars(request).
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func (r *Route) Host(tpl string) *Route {
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r.err = r.addRegexpMatcher(tpl, regexpTypeHost)
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return r
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}
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// MatcherFunc ----------------------------------------------------------------
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// MatcherFunc is the function signature used by custom matchers.
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type MatcherFunc func(*http.Request, *RouteMatch) bool
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// Match returns the match for a given request.
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func (m MatcherFunc) Match(r *http.Request, match *RouteMatch) bool {
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return m(r, match)
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}
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// MatcherFunc adds a custom function to be used as request matcher.
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func (r *Route) MatcherFunc(f MatcherFunc) *Route {
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return r.addMatcher(f)
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}
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// Methods --------------------------------------------------------------------
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// methodMatcher matches the request against HTTP methods.
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type methodMatcher []string
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func (m methodMatcher) Match(r *http.Request, match *RouteMatch) bool {
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return matchInArray(m, r.Method)
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}
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// Methods adds a matcher for HTTP methods.
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// It accepts a sequence of one or more methods to be matched, e.g.:
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// "GET", "POST", "PUT".
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func (r *Route) Methods(methods ...string) *Route {
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for k, v := range methods {
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methods[k] = strings.ToUpper(v)
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}
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return r.addMatcher(methodMatcher(methods))
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}
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// Path -----------------------------------------------------------------------
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// Path adds a matcher for the URL path.
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// It accepts a template with zero or more URL variables enclosed by {}. The
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// template must start with a "/".
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// Variables can define an optional regexp pattern to be matched:
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//
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// - {name} matches anything until the next slash.
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//
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// - {name:pattern} matches the given regexp pattern.
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//
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// For example:
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//
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// r := mux.NewRouter()
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// r.Path("/products/").Handler(ProductsHandler)
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// r.Path("/products/{key}").Handler(ProductsHandler)
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// r.Path("/articles/{category}/{id:[0-9]+}").
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// Handler(ArticleHandler)
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//
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// Variable names must be unique in a given route. They can be retrieved
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// calling mux.Vars(request).
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func (r *Route) Path(tpl string) *Route {
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r.err = r.addRegexpMatcher(tpl, regexpTypePath)
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return r
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}
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// PathPrefix -----------------------------------------------------------------
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// PathPrefix adds a matcher for the URL path prefix. This matches if the given
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// template is a prefix of the full URL path. See Route.Path() for details on
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// the tpl argument.
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//
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// Note that it does not treat slashes specially ("/foobar/" will be matched by
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// the prefix "/foo") so you may want to use a trailing slash here.
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//
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// Also note that the setting of Router.StrictSlash() has no effect on routes
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// with a PathPrefix matcher.
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func (r *Route) PathPrefix(tpl string) *Route {
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r.err = r.addRegexpMatcher(tpl, regexpTypePrefix)
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return r
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}
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// Query ----------------------------------------------------------------------
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// Queries adds a matcher for URL query values.
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// It accepts a sequence of key/value pairs. Values may define variables.
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// For example:
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//
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// r := mux.NewRouter()
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// r.Queries("foo", "bar", "id", "{id:[0-9]+}")
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//
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// The above route will only match if the URL contains the defined queries
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// values, e.g.: ?foo=bar&id=42.
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//
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// It the value is an empty string, it will match any value if the key is set.
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//
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// Variables can define an optional regexp pattern to be matched:
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//
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// - {name} matches anything until the next slash.
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//
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// - {name:pattern} matches the given regexp pattern.
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func (r *Route) Queries(pairs ...string) *Route {
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length := len(pairs)
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if length%2 != 0 {
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r.err = fmt.Errorf(
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"mux: number of parameters must be multiple of 2, got %v", pairs)
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return nil
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}
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for i := 0; i < length; i += 2 {
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if r.err = r.addRegexpMatcher(pairs[i]+"="+pairs[i+1], regexpTypeQuery); r.err != nil {
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return r
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}
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}
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return r
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}
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// Schemes --------------------------------------------------------------------
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// schemeMatcher matches the request against URL schemes.
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type schemeMatcher []string
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func (m schemeMatcher) Match(r *http.Request, match *RouteMatch) bool {
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return matchInArray(m, r.URL.Scheme)
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}
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// Schemes adds a matcher for URL schemes.
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// It accepts a sequence of schemes to be matched, e.g.: "http", "https".
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func (r *Route) Schemes(schemes ...string) *Route {
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for k, v := range schemes {
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schemes[k] = strings.ToLower(v)
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}
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if len(schemes) > 0 {
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r.buildScheme = schemes[0]
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}
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return r.addMatcher(schemeMatcher(schemes))
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}
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// BuildVarsFunc --------------------------------------------------------------
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// BuildVarsFunc is the function signature used by custom build variable
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// functions (which can modify route variables before a route's URL is built).
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type BuildVarsFunc func(map[string]string) map[string]string
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// BuildVarsFunc adds a custom function to be used to modify build variables
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// before a route's URL is built.
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func (r *Route) BuildVarsFunc(f BuildVarsFunc) *Route {
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if r.buildVarsFunc != nil {
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// compose the old and new functions
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old := r.buildVarsFunc
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r.buildVarsFunc = func(m map[string]string) map[string]string {
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return f(old(m))
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}
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} else {
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r.buildVarsFunc = f
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}
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return r
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}
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// Subrouter ------------------------------------------------------------------
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// Subrouter creates a subrouter for the route.
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//
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// It will test the inner routes only if the parent route matched. For example:
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//
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// r := mux.NewRouter()
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// s := r.Host("www.example.com").Subrouter()
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// s.HandleFunc("/products/", ProductsHandler)
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// s.HandleFunc("/products/{key}", ProductHandler)
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// s.HandleFunc("/articles/{category}/{id:[0-9]+}"), ArticleHandler)
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//
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// Here, the routes registered in the subrouter won't be tested if the host
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// doesn't match.
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func (r *Route) Subrouter() *Router {
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// initialize a subrouter with a copy of the parent route's configuration
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router := &Router{routeConf: copyRouteConf(r.routeConf), namedRoutes: r.namedRoutes}
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r.addMatcher(router)
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return router
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}
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// ----------------------------------------------------------------------------
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// URL building
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// ----------------------------------------------------------------------------
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// URL builds a URL for the route.
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//
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// It accepts a sequence of key/value pairs for the route variables. For
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// example, given this route:
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//
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// r := mux.NewRouter()
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// r.HandleFunc("/articles/{category}/{id:[0-9]+}", ArticleHandler).
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// Name("article")
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//
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// ...a URL for it can be built using:
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//
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// url, err := r.Get("article").URL("category", "technology", "id", "42")
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//
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// ...which will return an url.URL with the following path:
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//
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// "/articles/technology/42"
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//
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// This also works for host variables:
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//
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// r := mux.NewRouter()
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// r.Host("{subdomain}.domain.com").
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// HandleFunc("/articles/{category}/{id:[0-9]+}", ArticleHandler).
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// Name("article")
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//
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// // url.String() will be "http://news.domain.com/articles/technology/42"
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// url, err := r.Get("article").URL("subdomain", "news",
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// "category", "technology",
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// "id", "42")
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//
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// All variables defined in the route are required, and their values must
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// conform to the corresponding patterns.
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func (r *Route) URL(pairs ...string) (*url.URL, error) {
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if r.err != nil {
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return nil, r.err
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}
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values, err := r.prepareVars(pairs...)
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if err != nil {
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return nil, err
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}
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var scheme, host, path string
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queries := make([]string, 0, len(r.regexp.queries))
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if r.regexp.host != nil {
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if host, err = r.regexp.host.url(values); err != nil {
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return nil, err
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}
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scheme = "http"
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if r.buildScheme != "" {
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scheme = r.buildScheme
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}
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}
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if r.regexp.path != nil {
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if path, err = r.regexp.path.url(values); err != nil {
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return nil, err
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}
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}
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for _, q := range r.regexp.queries {
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var query string
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if query, err = q.url(values); err != nil {
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return nil, err
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}
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queries = append(queries, query)
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}
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return &url.URL{
|
|
Scheme: scheme,
|
|
Host: host,
|
|
Path: path,
|
|
RawQuery: strings.Join(queries, "&"),
|
|
}, nil
|
|
}
|
|
|
|
// URLHost builds the host part of the URL for a route. See Route.URL().
|
|
//
|
|
// The route must have a host defined.
|
|
func (r *Route) URLHost(pairs ...string) (*url.URL, error) {
|
|
if r.err != nil {
|
|
return nil, r.err
|
|
}
|
|
if r.regexp.host == nil {
|
|
return nil, errors.New("mux: route doesn't have a host")
|
|
}
|
|
values, err := r.prepareVars(pairs...)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
host, err := r.regexp.host.url(values)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
u := &url.URL{
|
|
Scheme: "http",
|
|
Host: host,
|
|
}
|
|
if r.buildScheme != "" {
|
|
u.Scheme = r.buildScheme
|
|
}
|
|
return u, nil
|
|
}
|
|
|
|
// URLPath builds the path part of the URL for a route. See Route.URL().
|
|
//
|
|
// The route must have a path defined.
|
|
func (r *Route) URLPath(pairs ...string) (*url.URL, error) {
|
|
if r.err != nil {
|
|
return nil, r.err
|
|
}
|
|
if r.regexp.path == nil {
|
|
return nil, errors.New("mux: route doesn't have a path")
|
|
}
|
|
values, err := r.prepareVars(pairs...)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
path, err := r.regexp.path.url(values)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return &url.URL{
|
|
Path: path,
|
|
}, nil
|
|
}
|
|
|
|
// GetPathTemplate returns the template used to build the
|
|
// route match.
|
|
// This is useful for building simple REST API documentation and for instrumentation
|
|
// against third-party services.
|
|
// An error will be returned if the route does not define a path.
|
|
func (r *Route) GetPathTemplate() (string, error) {
|
|
if r.err != nil {
|
|
return "", r.err
|
|
}
|
|
if r.regexp.path == nil {
|
|
return "", errors.New("mux: route doesn't have a path")
|
|
}
|
|
return r.regexp.path.template, nil
|
|
}
|
|
|
|
// GetPathRegexp returns the expanded regular expression used to match route path.
|
|
// This is useful for building simple REST API documentation and for instrumentation
|
|
// against third-party services.
|
|
// An error will be returned if the route does not define a path.
|
|
func (r *Route) GetPathRegexp() (string, error) {
|
|
if r.err != nil {
|
|
return "", r.err
|
|
}
|
|
if r.regexp.path == nil {
|
|
return "", errors.New("mux: route does not have a path")
|
|
}
|
|
return r.regexp.path.regexp.String(), nil
|
|
}
|
|
|
|
// GetQueriesRegexp returns the expanded regular expressions used to match the
|
|
// route queries.
|
|
// This is useful for building simple REST API documentation and for instrumentation
|
|
// against third-party services.
|
|
// An error will be returned if the route does not have queries.
|
|
func (r *Route) GetQueriesRegexp() ([]string, error) {
|
|
if r.err != nil {
|
|
return nil, r.err
|
|
}
|
|
if r.regexp.queries == nil {
|
|
return nil, errors.New("mux: route doesn't have queries")
|
|
}
|
|
var queries []string
|
|
for _, query := range r.regexp.queries {
|
|
queries = append(queries, query.regexp.String())
|
|
}
|
|
return queries, nil
|
|
}
|
|
|
|
// GetQueriesTemplates returns the templates used to build the
|
|
// query matching.
|
|
// This is useful for building simple REST API documentation and for instrumentation
|
|
// against third-party services.
|
|
// An error will be returned if the route does not define queries.
|
|
func (r *Route) GetQueriesTemplates() ([]string, error) {
|
|
if r.err != nil {
|
|
return nil, r.err
|
|
}
|
|
if r.regexp.queries == nil {
|
|
return nil, errors.New("mux: route doesn't have queries")
|
|
}
|
|
var queries []string
|
|
for _, query := range r.regexp.queries {
|
|
queries = append(queries, query.template)
|
|
}
|
|
return queries, nil
|
|
}
|
|
|
|
// GetMethods returns the methods the route matches against
|
|
// This is useful for building simple REST API documentation and for instrumentation
|
|
// against third-party services.
|
|
// An error will be returned if route does not have methods.
|
|
func (r *Route) GetMethods() ([]string, error) {
|
|
if r.err != nil {
|
|
return nil, r.err
|
|
}
|
|
for _, m := range r.matchers {
|
|
if methods, ok := m.(methodMatcher); ok {
|
|
return []string(methods), nil
|
|
}
|
|
}
|
|
return nil, errors.New("mux: route doesn't have methods")
|
|
}
|
|
|
|
// GetHostTemplate returns the template used to build the
|
|
// route match.
|
|
// This is useful for building simple REST API documentation and for instrumentation
|
|
// against third-party services.
|
|
// An error will be returned if the route does not define a host.
|
|
func (r *Route) GetHostTemplate() (string, error) {
|
|
if r.err != nil {
|
|
return "", r.err
|
|
}
|
|
if r.regexp.host == nil {
|
|
return "", errors.New("mux: route doesn't have a host")
|
|
}
|
|
return r.regexp.host.template, nil
|
|
}
|
|
|
|
// prepareVars converts the route variable pairs into a map. If the route has a
|
|
// BuildVarsFunc, it is invoked.
|
|
func (r *Route) prepareVars(pairs ...string) (map[string]string, error) {
|
|
m, err := mapFromPairsToString(pairs...)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return r.buildVars(m), nil
|
|
}
|
|
|
|
func (r *Route) buildVars(m map[string]string) map[string]string {
|
|
if r.buildVarsFunc != nil {
|
|
m = r.buildVarsFunc(m)
|
|
}
|
|
return m
|
|
}
|