711 lines
20 KiB
Go
711 lines
20 KiB
Go
// 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 {
|
|
// Request handler for the route.
|
|
handler http.Handler
|
|
// 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
|
|
|
|
// "global" reference to all named routes
|
|
namedRoutes map[string]*Route
|
|
|
|
// config possibly passed in from `Router`
|
|
routeConf
|
|
}
|
|
|
|
// SkipClean reports whether path cleaning is enabled for this route via
|
|
// Router.SkipClean.
|
|
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
|
|
}
|
|
|
|
var matchErr error
|
|
|
|
// Match everything.
|
|
for _, m := range r.matchers {
|
|
if matched := m.Match(req, match); !matched {
|
|
if _, ok := m.(methodMatcher); ok {
|
|
matchErr = ErrMethodMismatch
|
|
continue
|
|
}
|
|
|
|
// Ignore ErrNotFound errors. These errors arise from match call
|
|
// to Subrouters.
|
|
//
|
|
// This prevents subsequent matching subrouters from failing to
|
|
// run middleware. If not ignored, the middleware would see a
|
|
// non-nil MatchErr and be skipped, even when there was a
|
|
// matching route.
|
|
if match.MatchErr == ErrNotFound {
|
|
match.MatchErr = nil
|
|
}
|
|
|
|
matchErr = nil
|
|
return false
|
|
}
|
|
}
|
|
|
|
if matchErr != nil {
|
|
match.MatchErr = matchErr
|
|
return false
|
|
}
|
|
|
|
if match.MatchErr == ErrMethodMismatch {
|
|
// We found a route which matches request method, clear MatchErr
|
|
match.MatchErr = nil
|
|
// Then override the mis-matched handler
|
|
match.Handler = r.handler
|
|
}
|
|
|
|
// 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.
|
|
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.
|
|
// It is an error to call Name more than once on a route.
|
|
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.namedRoutes[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, typ regexpType) error {
|
|
if r.err != nil {
|
|
return r.err
|
|
}
|
|
if typ == regexpTypePath || typ == regexpTypePrefix {
|
|
if 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, typ, routeRegexpOptions{
|
|
strictSlash: r.strictSlash,
|
|
useEncodedPath: 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 typ == regexpTypeHost {
|
|
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 typ == regexpTypeQuery {
|
|
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.
|
|
// If the value is an empty string, it will match any value if the key is set.
|
|
// Use the start and end of string anchors (^ and $) to match an exact value.
|
|
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, regexpTypeHost)
|
|
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, regexpTypePath)
|
|
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, regexpTypePrefix)
|
|
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.
|
|
//
|
|
// If 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], regexpTypeQuery); 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)
|
|
}
|
|
if len(schemes) > 0 {
|
|
r.buildScheme = schemes[0]
|
|
}
|
|
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 {
|
|
if r.buildVarsFunc != nil {
|
|
// compose the old and new functions
|
|
old := r.buildVarsFunc
|
|
r.buildVarsFunc = func(m map[string]string) map[string]string {
|
|
return f(old(m))
|
|
}
|
|
} else {
|
|
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 {
|
|
// initialize a subrouter with a copy of the parent route's configuration
|
|
router := &Router{routeConf: copyRouteConf(r.routeConf), namedRoutes: r.namedRoutes}
|
|
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
|
|
}
|
|
values, err := r.prepareVars(pairs...)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
var scheme, host, path string
|
|
queries := make([]string, 0, len(r.regexp.queries))
|
|
if r.regexp.host != nil {
|
|
if host, err = r.regexp.host.url(values); err != nil {
|
|
return nil, err
|
|
}
|
|
scheme = "http"
|
|
if r.buildScheme != "" {
|
|
scheme = r.buildScheme
|
|
}
|
|
}
|
|
if r.regexp.path != nil {
|
|
if path, err = r.regexp.path.url(values); err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
for _, q := range r.regexp.queries {
|
|
var query string
|
|
if query, err = q.url(values); err != nil {
|
|
return nil, err
|
|
}
|
|
queries = append(queries, query)
|
|
}
|
|
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
|
|
}
|