Router by aah framework

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HTTP Router brings domain and sub-domains routing, it internally uses customized version of radix tree implementation from developer by @julienschmidt.


  • v0.12.1 released and tagged on Jul 27, 2018.


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    Package router provides routing implementation for aah framework. Routes config file format is similar to HOCON syntax aka typesafe config it gets parsed by ``.

    aah router internally uses customized version of radix tree implementation from `` developer by `@julienschmidt`.



    View Source
    const (
    	// SlashString const for comparison use
    	SlashString = "/"
    View Source
    const Version = "0.12.1"

      Version no. of aah framework router library


      View Source
      var (
      	ErrCORSOriginIsInvalid       = errors.New("cors: invalid origin")
      	ErrCORSMethodNotAllowed      = errors.New("cors: method not allowed")
      	ErrCORSHeaderNotAllowed      = errors.New("cors: header not allowed")
      	ErrCORSContentTypeNotAllowed = errors.New("cors: content-type not allowed")

        CORS errors

        View Source
        var (
        	// HTTPMethodActionMap is default Controller Action name for corresponding
        	// HTTP Method. If it's not provided in the route configuration.
        	HTTPMethodActionMap = map[string]string{
        		ahttp.MethodGet:     "Index",
        		ahttp.MethodPost:    "Create",
        		ahttp.MethodPut:     "Update",
        		ahttp.MethodPatch:   "Update",
        		ahttp.MethodDelete:  "Delete",
        		ahttp.MethodOptions: "Options",
        		ahttp.MethodHead:    "Head",
        		ahttp.MethodTrace:   "Trace",
        	// ErrNoDomainRoutesConfigFound returned when routes config file not found or doesn't
        	// have `domains { ... }` config information.
        	ErrNoDomainRoutesConfigFound = errors.New("router: no domain routes config found")
        	// ErrRouteConstraintFailed returned when request route constraints failed.
        	ErrRouteConstraintFailed = errors.New("router: route constraints failed")


        func CleanPath

        func CleanPath(p string) string

          CleanPath is the URL version of path.Clean, it returns a canonical URL path for p, eliminating . and .. elements.

          The following rules are applied iteratively until no further processing can be done:

          1. Replace multiple slashes with a single slash.
          2. Eliminate each . path name element (the current directory).
          3. Eliminate each inner .. path name element (the parent directory)
             along with the non-.. element that precedes it.
          4. Eliminate .. elements that begin a rooted path:
             that is, replace "/.." by "/" at the beginning of a path.

          If the result of this process is an empty string, "/" is returned

          func IsDefaultAction

          func IsDefaultAction(action string) bool

            IsDefaultAction method is to identify given action name is defined by aah framework in absence of user configured route action name.


            type CORS

            type CORS struct {
            	AllowCredentials bool
            	MaxAge string
            	AllowOrigins  []string
            	AllowMethods  []string
            	AllowHeaders  []string
            	ExposeHeaders []string
            	// contains filtered or unexported fields

              CORS struct holds Cross-Origin Resource Sharing (CORS) configuration values and verification methods for the route.

              Spec: Friendly Read:

              func (*CORS) AddAllowHeaders

              func (c *CORS) AddAllowHeaders(hdrs []string) *CORS

                AddAllowHeaders method adds the given HTTP header into allow headers list.

                func (*CORS) AddAllowMethods

                func (c *CORS) AddAllowMethods(methods []string) *CORS

                  AddAllowMethods method adds the given HTTP verb into allow methods list.

                  func (*CORS) AddExposeHeaders

                  func (c *CORS) AddExposeHeaders(hdrs []string) *CORS

                    AddExposeHeaders method adds the given HTTP header into expose headers list.

                    func (*CORS) AddOrigins

                    func (c *CORS) AddOrigins(origins []string) *CORS

                      AddOrigins method adds the given origin into allow origin list.

                      func (*CORS) IsHeadersAllowed

                      func (c *CORS) IsHeadersAllowed(hdrs string) bool

                        IsHeadersAllowed method returns true if preflight headers are allowed otherwise false.

                        func (*CORS) IsMethodAllowed

                        func (c *CORS) IsMethodAllowed(method string) bool

                          IsMethodAllowed method returns true if preflight method is allowed otherwise false.

                          func (*CORS) IsOriginAllowed

                          func (c *CORS) IsOriginAllowed(origin string) bool

                            IsOriginAllowed method check given origin is allowed or not.

                            func (*CORS) SetAllowCredentials

                            func (c *CORS) SetAllowCredentials(b bool) *CORS

                              SetAllowCredentials method sets the given boolean into allow credentials.

                              func (*CORS) SetMaxAge

                              func (c *CORS) SetMaxAge(age string) *CORS

                                SetMaxAge method parses the given duration string into seconds and adds to CORS. `time.ParseDuration` method time units are supported.

                                func (CORS) String

                                func (c CORS) String() string

                                  String method returns string representation of CORS configuration values.

                                  type Domain

                                  type Domain struct {
                                  	IsSubDomain           bool
                                  	MethodNotAllowed      bool
                                  	RedirectTrailingSlash bool
                                  	AutoOptions           bool
                                  	AntiCSRFEnabled       bool
                                  	CORSEnabled           bool
                                  	Key                   string
                                  	Name                  string
                                  	Host                  string
                                  	Port                  string
                                  	DefaultAuth           string
                                  	CORS                  *CORS
                                  	// contains filtered or unexported fields

                                    Domain is used to hold domain related routes and it's route configuration

                                    func (*Domain) AddRoute

                                    func (d *Domain) AddRoute(route *Route) error

                                      AddRoute method adds the given route into domain routing tree.

                                      func (*Domain) Allowed

                                      func (d *Domain) Allowed(requestMethod, path string) (allowed string)

                                        Allowed method returns the value for header `Allow` otherwise empty string.

                                        func (*Domain) Lookup

                                        func (d *Domain) Lookup(req *http.Request) (*Route, ahttp.PathParams, bool)

                                          Lookup method looks up route if found it returns route, path parameters, redirect trailing slash indicator for given `ahttp.Request` by domain and request URI otherwise returns nil and false.

                                          func (*Domain) LookupByName

                                          func (d *Domain) LookupByName(name string) *Route

                                            LookupByName method returns the route for given route name otherwise nil.

                                            func (*Domain) RouteURL

                                            func (d *Domain) RouteURL(routeName string, args ...interface{}) string

                                              RouteURL method composes route reverse URL for given route and arguments based on index order. If error occurs then method logs it and returns empty string.

                                              func (*Domain) RouteURLNamedArgs

                                              func (d *Domain) RouteURLNamedArgs(routeName string, args map[string]interface{}) string

                                                RouteURLNamedArgs composes reverse URL by route name and key-value pair arguments. Additional key-value pairs composed as URL query string. If error occurs then method logs it and returns empty string.

                                                type Route

                                                type Route struct {
                                                	IsAntiCSRFCheck bool
                                                	IsStatic        bool
                                                	ListDir         bool
                                                	MaxBodySize     int64
                                                	Name            string
                                                	Path            string
                                                	Method          string
                                                	Target          string
                                                	Action          string
                                                	ParentName      string
                                                	Auth            string
                                                	Dir             string
                                                	File            string
                                                	CORS            *CORS
                                                	Constraints     map[string]string
                                                	// contains filtered or unexported fields

                                                  Route holds the single route details.

                                                  func (*Route) HasAccess

                                                  func (r *Route) HasAccess(subject *security.Subject) (bool, []*authz.Reason)

                                                    HasAccess method does authorization check based on configured values at route level. TODO: the appropriate place for this method would be `security` package.

                                                    func (*Route) IsDir

                                                    func (r *Route) IsDir() bool

                                                      IsDir method returns true if serving directory otherwise false.

                                                      func (*Route) IsFile

                                                      func (r *Route) IsFile() bool

                                                        IsFile method returns true if serving single file otherwise false.

                                                        func (*Route) String

                                                        func (r *Route) String() string

                                                          String method is Stringer interface.

                                                          type Router

                                                          type Router struct {
                                                          	Domains []*Domain
                                                          	// contains filtered or unexported fields

                                                            Router is used to register all application routes and finds the appropriate route information for incoming request path.

                                                            func New

                                                            func New(configPath string, appCfg *config.Config) *Router

                                                              New method returns the Router instance.

                                                              func NewWithApp

                                                              func NewWithApp(app interface{}, configPath string) (*Router, error)

                                                                NewWithApp method creates router instance with aah application instance.

                                                                func (*Router) DomainAddresses

                                                                func (r *Router) DomainAddresses() []string

                                                                  DomainAddresses method returns domain addresses (host:port) from routes configuration.

                                                                  func (*Router) FindDomain

                                                                  func (r *Router) FindDomain(req *ahttp.Request) *Domain

                                                                    FindDomain returns domain routes configuration based on http request otherwise nil.

                                                                    func (*Router) Load

                                                                    func (r *Router) Load() (err error)

                                                                      Load method loads a configuration from given file e.g. `routes.conf` and applies env profile override values if available.

                                                                      func (*Router) Lookup

                                                                      func (r *Router) Lookup(host string) *Domain

                                                                        Lookup method returns domain for given host otherwise nil.

                                                                        func (*Router) RegisteredActions

                                                                        func (r *Router) RegisteredActions() map[string]map[string]uint8

                                                                          RegisteredActions method returns all the controller name and it's actions configured in the "routes.conf".

                                                                          func (*Router) RegisteredWSActions

                                                                          func (r *Router) RegisteredWSActions() map[string]map[string]uint8

                                                                            RegisteredWSActions method returns all the WebSocket name and it's actions configured in the "routes.conf".

                                                                            func (*Router) RootDomain

                                                                            func (r *Router) RootDomain() *Domain

                                                                              RootDomain method returns the root domain registered in the routes.conf. For e.g.:,, * Root Domain is ``.