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authorMatthew Heon <matthew.heon@gmail.com>2017-11-01 11:24:59 -0400
committerMatthew Heon <matthew.heon@gmail.com>2017-11-01 11:24:59 -0400
commita031b83a09a8628435317a03f199cdc18b78262f (patch)
treebc017a96769ce6de33745b8b0b1304ccf38e9df0 /vendor/github.com/gorilla/mux/route.go
parent2b74391cd5281f6fdf391ff8ad50fd1490f6bf89 (diff)
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Initial checkin from CRI-O repo
Signed-off-by: Matthew Heon <matthew.heon@gmail.com>
Diffstat (limited to 'vendor/github.com/gorilla/mux/route.go')
-rw-r--r--vendor/github.com/gorilla/mux/route.go636
1 files changed, 636 insertions, 0 deletions
diff --git a/vendor/github.com/gorilla/mux/route.go b/vendor/github.com/gorilla/mux/route.go
new file mode 100644
index 000000000..922191592
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+++ b/vendor/github.com/gorilla/mux/route.go
@@ -0,0 +1,636 @@
+// Copyright 2012 The Gorilla Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package mux
+
+import (
+ "errors"
+ "fmt"
+ "net/http"
+ "net/url"
+ "regexp"
+ "strings"
+)
+
+// Route stores information to match a request and build URLs.
+type Route struct {
+ // Parent where the route was registered (a Router).
+ parent parentRoute
+ // Request handler for the route.
+ handler http.Handler
+ // List of matchers.
+ matchers []matcher
+ // Manager for the variables from host and path.
+ regexp *routeRegexpGroup
+ // If true, when the path pattern is "/path/", accessing "/path" will
+ // redirect to the former and vice versa.
+ strictSlash bool
+ // If true, when the path pattern is "/path//to", accessing "/path//to"
+ // will not redirect
+ skipClean bool
+ // If true, "/path/foo%2Fbar/to" will match the path "/path/{var}/to"
+ useEncodedPath bool
+ // If true, this route never matches: it is only used to build URLs.
+ buildOnly bool
+ // The name used to build URLs.
+ name string
+ // Error resulted from building a route.
+ err error
+
+ buildVarsFunc BuildVarsFunc
+}
+
+func (r *Route) SkipClean() bool {
+ return r.skipClean
+}
+
+// Match matches the route against the request.
+func (r *Route) Match(req *http.Request, match *RouteMatch) bool {
+ if r.buildOnly || r.err != nil {
+ return false
+ }
+ // Match everything.
+ for _, m := range r.matchers {
+ if matched := m.Match(req, match); !matched {
+ return false
+ }
+ }
+ // Yay, we have a match. Let's collect some info about it.
+ if match.Route == nil {
+ match.Route = r
+ }
+ if match.Handler == nil {
+ match.Handler = r.handler
+ }
+ if match.Vars == nil {
+ match.Vars = make(map[string]string)
+ }
+ // Set variables.
+ if r.regexp != nil {
+ r.regexp.setMatch(req, match, r)
+ }
+ return true
+}
+
+// ----------------------------------------------------------------------------
+// Route attributes
+// ----------------------------------------------------------------------------
+
+// GetError returns an error resulted from building the route, if any.
+func (r *Route) GetError() error {
+ return r.err
+}
+
+// BuildOnly sets the route to never match: it is only used to build URLs.
+func (r *Route) BuildOnly() *Route {
+ r.buildOnly = true
+ return r
+}
+
+// Handler --------------------------------------------------------------------
+
+// Handler sets a handler for the route.
+func (r *Route) Handler(handler http.Handler) *Route {
+ if r.err == nil {
+ r.handler = handler
+ }
+ return r
+}
+
+// HandlerFunc sets a handler function for the route.
+func (r *Route) HandlerFunc(f func(http.ResponseWriter, *http.Request)) *Route {
+ return r.Handler(http.HandlerFunc(f))
+}
+
+// GetHandler returns the handler for the route, if any.
+func (r *Route) GetHandler() http.Handler {
+ return r.handler
+}
+
+// Name -----------------------------------------------------------------------
+
+// Name sets the name for the route, used to build URLs.
+// If the name was registered already it will be overwritten.
+func (r *Route) Name(name string) *Route {
+ if r.name != "" {
+ r.err = fmt.Errorf("mux: route already has name %q, can't set %q",
+ r.name, name)
+ }
+ if r.err == nil {
+ r.name = name
+ r.getNamedRoutes()[name] = r
+ }
+ return r
+}
+
+// GetName returns the name for the route, if any.
+func (r *Route) GetName() string {
+ return r.name
+}
+
+// ----------------------------------------------------------------------------
+// Matchers
+// ----------------------------------------------------------------------------
+
+// matcher types try to match a request.
+type matcher interface {
+ Match(*http.Request, *RouteMatch) bool
+}
+
+// addMatcher adds a matcher to the route.
+func (r *Route) addMatcher(m matcher) *Route {
+ if r.err == nil {
+ r.matchers = append(r.matchers, m)
+ }
+ return r
+}
+
+// addRegexpMatcher adds a host or path matcher and builder to a route.
+func (r *Route) addRegexpMatcher(tpl string, matchHost, matchPrefix, matchQuery bool) error {
+ if r.err != nil {
+ return r.err
+ }
+ r.regexp = r.getRegexpGroup()
+ if !matchHost && !matchQuery {
+ if tpl == "/" && (len(tpl) == 0 || tpl[0] != '/') {
+ return fmt.Errorf("mux: path must start with a slash, got %q", tpl)
+ }
+ if r.regexp.path != nil {
+ tpl = strings.TrimRight(r.regexp.path.template, "/") + tpl
+ }
+ }
+ rr, err := newRouteRegexp(tpl, matchHost, matchPrefix, matchQuery, r.strictSlash, r.useEncodedPath)
+ if err != nil {
+ return err
+ }
+ for _, q := range r.regexp.queries {
+ if err = uniqueVars(rr.varsN, q.varsN); err != nil {
+ return err
+ }
+ }
+ if matchHost {
+ if r.regexp.path != nil {
+ if err = uniqueVars(rr.varsN, r.regexp.path.varsN); err != nil {
+ return err
+ }
+ }
+ r.regexp.host = rr
+ } else {
+ if r.regexp.host != nil {
+ if err = uniqueVars(rr.varsN, r.regexp.host.varsN); err != nil {
+ return err
+ }
+ }
+ if matchQuery {
+ r.regexp.queries = append(r.regexp.queries, rr)
+ } else {
+ r.regexp.path = rr
+ }
+ }
+ r.addMatcher(rr)
+ return nil
+}
+
+// Headers --------------------------------------------------------------------
+
+// headerMatcher matches the request against header values.
+type headerMatcher map[string]string
+
+func (m headerMatcher) Match(r *http.Request, match *RouteMatch) bool {
+ return matchMapWithString(m, r.Header, true)
+}
+
+// Headers adds a matcher for request header values.
+// It accepts a sequence of key/value pairs to be matched. For example:
+//
+// r := mux.NewRouter()
+// r.Headers("Content-Type", "application/json",
+// "X-Requested-With", "XMLHttpRequest")
+//
+// The above route will only match if both request header values match.
+// If the value is an empty string, it will match any value if the key is set.
+func (r *Route) Headers(pairs ...string) *Route {
+ if r.err == nil {
+ var headers map[string]string
+ headers, r.err = mapFromPairsToString(pairs...)
+ return r.addMatcher(headerMatcher(headers))
+ }
+ return r
+}
+
+// headerRegexMatcher matches the request against the route given a regex for the header
+type headerRegexMatcher map[string]*regexp.Regexp
+
+func (m headerRegexMatcher) Match(r *http.Request, match *RouteMatch) bool {
+ return matchMapWithRegex(m, r.Header, true)
+}
+
+// HeadersRegexp accepts a sequence of key/value pairs, where the value has regex
+// support. For example:
+//
+// r := mux.NewRouter()
+// r.HeadersRegexp("Content-Type", "application/(text|json)",
+// "X-Requested-With", "XMLHttpRequest")
+//
+// The above route will only match if both the request header matches both regular expressions.
+// It the value is an empty string, it will match any value if the key is set.
+func (r *Route) HeadersRegexp(pairs ...string) *Route {
+ if r.err == nil {
+ var headers map[string]*regexp.Regexp
+ headers, r.err = mapFromPairsToRegex(pairs...)
+ return r.addMatcher(headerRegexMatcher(headers))
+ }
+ return r
+}
+
+// Host -----------------------------------------------------------------------
+
+// Host adds a matcher for the URL host.
+// It accepts a template with zero or more URL variables enclosed by {}.
+// Variables can define an optional regexp pattern to be matched:
+//
+// - {name} matches anything until the next dot.
+//
+// - {name:pattern} matches the given regexp pattern.
+//
+// For example:
+//
+// r := mux.NewRouter()
+// r.Host("www.example.com")
+// r.Host("{subdomain}.domain.com")
+// r.Host("{subdomain:[a-z]+}.domain.com")
+//
+// Variable names must be unique in a given route. They can be retrieved
+// calling mux.Vars(request).
+func (r *Route) Host(tpl string) *Route {
+ r.err = r.addRegexpMatcher(tpl, true, false, false)
+ return r
+}
+
+// MatcherFunc ----------------------------------------------------------------
+
+// MatcherFunc is the function signature used by custom matchers.
+type MatcherFunc func(*http.Request, *RouteMatch) bool
+
+// Match returns the match for a given request.
+func (m MatcherFunc) Match(r *http.Request, match *RouteMatch) bool {
+ return m(r, match)
+}
+
+// MatcherFunc adds a custom function to be used as request matcher.
+func (r *Route) MatcherFunc(f MatcherFunc) *Route {
+ return r.addMatcher(f)
+}
+
+// Methods --------------------------------------------------------------------
+
+// methodMatcher matches the request against HTTP methods.
+type methodMatcher []string
+
+func (m methodMatcher) Match(r *http.Request, match *RouteMatch) bool {
+ return matchInArray(m, r.Method)
+}
+
+// Methods adds a matcher for HTTP methods.
+// It accepts a sequence of one or more methods to be matched, e.g.:
+// "GET", "POST", "PUT".
+func (r *Route) Methods(methods ...string) *Route {
+ for k, v := range methods {
+ methods[k] = strings.ToUpper(v)
+ }
+ return r.addMatcher(methodMatcher(methods))
+}
+
+// Path -----------------------------------------------------------------------
+
+// Path adds a matcher for the URL path.
+// It accepts a template with zero or more URL variables enclosed by {}. The
+// template must start with a "/".
+// Variables can define an optional regexp pattern to be matched:
+//
+// - {name} matches anything until the next slash.
+//
+// - {name:pattern} matches the given regexp pattern.
+//
+// For example:
+//
+// r := mux.NewRouter()
+// r.Path("/products/").Handler(ProductsHandler)
+// r.Path("/products/{key}").Handler(ProductsHandler)
+// r.Path("/articles/{category}/{id:[0-9]+}").
+// Handler(ArticleHandler)
+//
+// Variable names must be unique in a given route. They can be retrieved
+// calling mux.Vars(request).
+func (r *Route) Path(tpl string) *Route {
+ r.err = r.addRegexpMatcher(tpl, false, false, false)
+ return r
+}
+
+// PathPrefix -----------------------------------------------------------------
+
+// PathPrefix adds a matcher for the URL path prefix. This matches if the given
+// template is a prefix of the full URL path. See Route.Path() for details on
+// the tpl argument.
+//
+// Note that it does not treat slashes specially ("/foobar/" will be matched by
+// the prefix "/foo") so you may want to use a trailing slash here.
+//
+// Also note that the setting of Router.StrictSlash() has no effect on routes
+// with a PathPrefix matcher.
+func (r *Route) PathPrefix(tpl string) *Route {
+ r.err = r.addRegexpMatcher(tpl, false, true, false)
+ return r
+}
+
+// Query ----------------------------------------------------------------------
+
+// Queries adds a matcher for URL query values.
+// It accepts a sequence of key/value pairs. Values may define variables.
+// For example:
+//
+// r := mux.NewRouter()
+// r.Queries("foo", "bar", "id", "{id:[0-9]+}")
+//
+// The above route will only match if the URL contains the defined queries
+// values, e.g.: ?foo=bar&id=42.
+//
+// It the value is an empty string, it will match any value if the key is set.
+//
+// Variables can define an optional regexp pattern to be matched:
+//
+// - {name} matches anything until the next slash.
+//
+// - {name:pattern} matches the given regexp pattern.
+func (r *Route) Queries(pairs ...string) *Route {
+ length := len(pairs)
+ if length%2 != 0 {
+ r.err = fmt.Errorf(
+ "mux: number of parameters must be multiple of 2, got %v", pairs)
+ return nil
+ }
+ for i := 0; i < length; i += 2 {
+ if r.err = r.addRegexpMatcher(pairs[i]+"="+pairs[i+1], false, false, true); r.err != nil {
+ return r
+ }
+ }
+
+ return r
+}
+
+// Schemes --------------------------------------------------------------------
+
+// schemeMatcher matches the request against URL schemes.
+type schemeMatcher []string
+
+func (m schemeMatcher) Match(r *http.Request, match *RouteMatch) bool {
+ return matchInArray(m, r.URL.Scheme)
+}
+
+// Schemes adds a matcher for URL schemes.
+// It accepts a sequence of schemes to be matched, e.g.: "http", "https".
+func (r *Route) Schemes(schemes ...string) *Route {
+ for k, v := range schemes {
+ schemes[k] = strings.ToLower(v)
+ }
+ return r.addMatcher(schemeMatcher(schemes))
+}
+
+// BuildVarsFunc --------------------------------------------------------------
+
+// BuildVarsFunc is the function signature used by custom build variable
+// functions (which can modify route variables before a route's URL is built).
+type BuildVarsFunc func(map[string]string) map[string]string
+
+// BuildVarsFunc adds a custom function to be used to modify build variables
+// before a route's URL is built.
+func (r *Route) BuildVarsFunc(f BuildVarsFunc) *Route {
+ r.buildVarsFunc = f
+ return r
+}
+
+// Subrouter ------------------------------------------------------------------
+
+// Subrouter creates a subrouter for the route.
+//
+// It will test the inner routes only if the parent route matched. For example:
+//
+// r := mux.NewRouter()
+// s := r.Host("www.example.com").Subrouter()
+// s.HandleFunc("/products/", ProductsHandler)
+// s.HandleFunc("/products/{key}", ProductHandler)
+// s.HandleFunc("/articles/{category}/{id:[0-9]+}"), ArticleHandler)
+//
+// Here, the routes registered in the subrouter won't be tested if the host
+// doesn't match.
+func (r *Route) Subrouter() *Router {
+ router := &Router{parent: r, strictSlash: r.strictSlash}
+ r.addMatcher(router)
+ return router
+}
+
+// ----------------------------------------------------------------------------
+// URL building
+// ----------------------------------------------------------------------------
+
+// URL builds a URL for the route.
+//
+// It accepts a sequence of key/value pairs for the route variables. For
+// example, given this route:
+//
+// r := mux.NewRouter()
+// r.HandleFunc("/articles/{category}/{id:[0-9]+}", ArticleHandler).
+// Name("article")
+//
+// ...a URL for it can be built using:
+//
+// url, err := r.Get("article").URL("category", "technology", "id", "42")
+//
+// ...which will return an url.URL with the following path:
+//
+// "/articles/technology/42"
+//
+// This also works for host variables:
+//
+// r := mux.NewRouter()
+// r.Host("{subdomain}.domain.com").
+// HandleFunc("/articles/{category}/{id:[0-9]+}", ArticleHandler).
+// Name("article")
+//
+// // url.String() will be "http://news.domain.com/articles/technology/42"
+// url, err := r.Get("article").URL("subdomain", "news",
+// "category", "technology",
+// "id", "42")
+//
+// All variables defined in the route are required, and their values must
+// conform to the corresponding patterns.
+func (r *Route) URL(pairs ...string) (*url.URL, error) {
+ if r.err != nil {
+ return nil, r.err
+ }
+ if r.regexp == nil {
+ return nil, errors.New("mux: route doesn't have a host or path")
+ }
+ values, err := r.prepareVars(pairs...)
+ if err != nil {
+ return nil, err
+ }
+ var scheme, host, path string
+ if r.regexp.host != nil {
+ // Set a default scheme.
+ scheme = "http"
+ if host, err = r.regexp.host.url(values); err != nil {
+ return nil, err
+ }
+ }
+ if r.regexp.path != nil {
+ if path, err = r.regexp.path.url(values); err != nil {
+ return nil, err
+ }
+ }
+ return &url.URL{
+ Scheme: scheme,
+ Host: host,
+ Path: path,
+ }, 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 == nil || 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
+ }
+ return &url.URL{
+ Scheme: "http",
+ Host: host,
+ }, 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 == nil || 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 == nil || r.regexp.path == nil {
+ return "", errors.New("mux: route doesn't have a path")
+ }
+ return r.regexp.path.template, nil
+}
+
+// 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 == nil || 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.parent != nil {
+ m = r.parent.buildVars(m)
+ }
+ if r.buildVarsFunc != nil {
+ m = r.buildVarsFunc(m)
+ }
+ return m
+}
+
+// ----------------------------------------------------------------------------
+// parentRoute
+// ----------------------------------------------------------------------------
+
+// parentRoute allows routes to know about parent host and path definitions.
+type parentRoute interface {
+ getNamedRoutes() map[string]*Route
+ getRegexpGroup() *routeRegexpGroup
+ buildVars(map[string]string) map[string]string
+}
+
+// getNamedRoutes returns the map where named routes are registered.
+func (r *Route) getNamedRoutes() map[string]*Route {
+ if r.parent == nil {
+ // During tests router is not always set.
+ r.parent = NewRouter()
+ }
+ return r.parent.getNamedRoutes()
+}
+
+// getRegexpGroup returns regexp definitions from this route.
+func (r *Route) getRegexpGroup() *routeRegexpGroup {
+ if r.regexp == nil {
+ if r.parent == nil {
+ // During tests router is not always set.
+ r.parent = NewRouter()
+ }
+ regexp := r.parent.getRegexpGroup()
+ if regexp == nil {
+ r.regexp = new(routeRegexpGroup)
+ } else {
+ // Copy.
+ r.regexp = &routeRegexpGroup{
+ host: regexp.host,
+ path: regexp.path,
+ queries: regexp.queries,
+ }
+ }
+ }
+ return r.regexp
+}