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group.go
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129 lines (110 loc) · 4.87 KB
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// SPDX-License-Identifier: MIT
// SPDX-FileCopyrightText: © 2015 LabStack LLC and Echo contributors
package echo
import (
"net/http"
)
// Group is a set of sub-routes for a specified route. It can be used for inner
// routes that share a common middleware or functionality that should be separate
// from the parent echo instance while still inheriting from it.
type Group struct {
common
host string
prefix string
echo *Echo
middleware []MiddlewareFunc
}
// Use implements `Echo#Use()` for sub-routes within the Group.
func (g *Group) Use(middleware ...MiddlewareFunc) {
g.middleware = append(g.middleware, middleware...)
if len(g.middleware) == 0 {
return
}
// group level middlewares are different from Echo `Pre` and `Use` middlewares (those are global). Group level middlewares
// are only executed if they are added to the Router with route.
// So we register catch all route (404 is a safe way to emulate route match) for this group and now during routing the
// Router would find route to match our request path and therefore guarantee the middleware(s) will get executed.
g.RouteNotFound("", NotFoundHandler)
g.RouteNotFound("/*", NotFoundHandler)
}
// CONNECT implements `Echo#CONNECT()` for sub-routes within the Group.
func (g *Group) CONNECT(path string, h HandlerFunc, m ...MiddlewareFunc) *Route {
return g.Add(http.MethodConnect, path, h, m...)
}
// DELETE implements `Echo#DELETE()` for sub-routes within the Group.
func (g *Group) DELETE(path string, h HandlerFunc, m ...MiddlewareFunc) *Route {
return g.Add(http.MethodDelete, path, h, m...)
}
// GET implements `Echo#GET()` for sub-routes within the Group.
func (g *Group) GET(path string, h HandlerFunc, m ...MiddlewareFunc) *Route {
return g.Add(http.MethodGet, path, h, m...)
}
// HEAD implements `Echo#HEAD()` for sub-routes within the Group.
func (g *Group) HEAD(path string, h HandlerFunc, m ...MiddlewareFunc) *Route {
return g.Add(http.MethodHead, path, h, m...)
}
// OPTIONS implements `Echo#OPTIONS()` for sub-routes within the Group.
func (g *Group) OPTIONS(path string, h HandlerFunc, m ...MiddlewareFunc) *Route {
return g.Add(http.MethodOptions, path, h, m...)
}
// PATCH implements `Echo#PATCH()` for sub-routes within the Group.
func (g *Group) PATCH(path string, h HandlerFunc, m ...MiddlewareFunc) *Route {
return g.Add(http.MethodPatch, path, h, m...)
}
// POST implements `Echo#POST()` for sub-routes within the Group.
func (g *Group) POST(path string, h HandlerFunc, m ...MiddlewareFunc) *Route {
return g.Add(http.MethodPost, path, h, m...)
}
// PUT implements `Echo#PUT()` for sub-routes within the Group.
func (g *Group) PUT(path string, h HandlerFunc, m ...MiddlewareFunc) *Route {
return g.Add(http.MethodPut, path, h, m...)
}
// TRACE implements `Echo#TRACE()` for sub-routes within the Group.
func (g *Group) TRACE(path string, h HandlerFunc, m ...MiddlewareFunc) *Route {
return g.Add(http.MethodTrace, path, h, m...)
}
// Any implements `Echo#Any()` for sub-routes within the Group.
func (g *Group) Any(path string, handler HandlerFunc, middleware ...MiddlewareFunc) []*Route {
routes := make([]*Route, len(methods))
for i, m := range methods {
routes[i] = g.Add(m, path, handler, middleware...)
}
return routes
}
// Match implements `Echo#Match()` for sub-routes within the Group.
func (g *Group) Match(methods []string, path string, handler HandlerFunc, middleware ...MiddlewareFunc) []*Route {
routes := make([]*Route, len(methods))
for i, m := range methods {
routes[i] = g.Add(m, path, handler, middleware...)
}
return routes
}
// Group creates a new sub-group with prefix and optional sub-group-level middleware.
func (g *Group) Group(prefix string, middleware ...MiddlewareFunc) (sg *Group) {
m := make([]MiddlewareFunc, 0, len(g.middleware)+len(middleware))
m = append(m, g.middleware...)
m = append(m, middleware...)
sg = g.echo.Group(g.prefix+prefix, m...)
sg.host = g.host
return
}
// File implements `Echo#File()` for sub-routes within the Group.
func (g *Group) File(path, file string) {
g.file(path, file, g.GET)
}
// RouteNotFound implements `Echo#RouteNotFound()` for sub-routes within the Group.
//
// Example: `g.RouteNotFound("/*", func(c echo.Context) error { return c.NoContent(http.StatusNotFound) })`
func (g *Group) RouteNotFound(path string, h HandlerFunc, m ...MiddlewareFunc) *Route {
return g.Add(RouteNotFound, path, h, m...)
}
// Add implements `Echo#Add()` for sub-routes within the Group.
func (g *Group) Add(method, path string, handler HandlerFunc, middleware ...MiddlewareFunc) *Route {
// Combine into a new slice to avoid accidentally passing the same slice for
// multiple routes, which would lead to later add() calls overwriting the
// middleware from earlier calls.
m := make([]MiddlewareFunc, 0, len(g.middleware)+len(middleware))
m = append(m, g.middleware...)
m = append(m, middleware...)
return g.echo.add(g.host, method, g.prefix+path, handler, m...)
}