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handler.go
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handler.go
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// Copyright 2017 Gerasimos Maropoulos, ΓΜ. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package router
import (
"html"
"net/http"
"sort"
"strings"
"github.com/kataras/iris/context"
"github.com/kataras/iris/core/nettools"
"github.com/kataras/iris/core/router/node"
)
// RequestHandler the middle man between acquiring a context and releasing it.
// By-default is the router algorithm.
type RequestHandler interface {
// HandleRequest is same as context.Handler but its usage is only about routing,
// separate the concept here.
HandleRequest(context.Context)
// Build should builds the handler, it's being called on router's BuildRouter.
Build(provider RoutesProvider) error
}
type tree struct {
Method string
// subdomain is empty for default-hostname routes,
// ex: mysubdomain.
Subdomain string
Nodes *node.Nodes
}
type routerHandler struct {
trees []*tree
hosts bool // true if at least one route contains a Subdomain.
}
var _ RequestHandler = &routerHandler{}
func (h *routerHandler) getTree(method, subdomain string) *tree {
for i := range h.trees {
t := h.trees[i]
if t.Method == method && t.Subdomain == subdomain {
return t
}
}
return nil
}
func (h *routerHandler) addRoute(method, subdomain, path string, handlers context.Handlers) error {
t := h.getTree(method, subdomain)
if t == nil {
n := make(node.Nodes, 0)
// first time we register a route to this method with this subdomain
t = &tree{Method: method, Subdomain: subdomain, Nodes: &n}
h.trees = append(h.trees, t)
}
return t.Nodes.Add(path, handlers)
}
// NewDefaultHandler returns the handler which is responsible
// to map the request with a route (aka mux implementation).
func NewDefaultHandler() RequestHandler {
h := &routerHandler{}
return h
}
func (h *routerHandler) Build(provider RoutesProvider) error {
registeredRoutes := provider.GetRoutes()
h.trees = h.trees[0:0] // reset, inneed when rebuilding.
// sort, subdomains goes first.
sort.Slice(registeredRoutes, func(i, j int) bool {
return len(registeredRoutes[i].Subdomain) >= len(registeredRoutes[j].Subdomain)
})
for _, r := range registeredRoutes {
if r.Subdomain != "" {
h.hosts = true
}
// the only "bad" with this is if the user made an error
// on route, it will be stacked shown in this build state
// and no in the lines of the user's action, they should read
// the docs better. Or TODO: add a link here in order to help new users.
if err := h.addRoute(r.Method, r.Subdomain, r.Path, r.Handlers); err != nil {
return err
}
}
return nil
}
func (h *routerHandler) HandleRequest(ctx context.Context) {
method := ctx.Method()
path := ctx.Path()
if !ctx.Application().ConfigurationReadOnly().GetDisablePathCorrection() {
if len(path) > 1 && path[len(path)-1] == '/' {
// Remove trailing slash and client-permant rule for redirection,
// if confgiuration allows that and path has an extra slash.
// update the new path and redirect.
r := ctx.Request()
path = path[:len(path)-1]
r.URL.Path = path
url := r.URL.String()
ctx.Redirect(url, http.StatusMovedPermanently)
// RFC2616 recommends that a short note "SHOULD" be included in the
// response because older user agents may not understand 301/307.
// Shouldn't send the response for POST or HEAD; that leaves GET.
if method == http.MethodGet {
note := "<a href=\"" +
html.EscapeString(url) +
"\">Moved Permanently</a>.\n"
ctx.ResponseWriter().WriteString(note)
}
return
}
}
for i := range h.trees {
t := h.trees[i]
if method != t.Method {
continue
}
if h.hosts && t.Subdomain != "" {
requestHost := ctx.Host()
if nettools.IsLoopbackSubdomain(requestHost) {
// this fixes a bug when listening on
// 127.0.0.1:8080 for example
// and have a wildcard subdomain and a route registered to root domain.
continue // it's not a subdomain, it's something like 127.0.0.1 probably
}
// it's a dynamic wildcard subdomain, we have just to check if ctx.subdomain is not empty
if t.Subdomain == DynamicSubdomainIndicator {
// mydomain.com -> invalid
// localhost -> invalid
// sub.mydomain.com -> valid
// sub.localhost -> valid
serverHost := ctx.Application().ConfigurationReadOnly().GetVHost()
if serverHost == requestHost {
continue // it's not a subdomain, it's a full domain (with .com...)
}
dotIdx := strings.IndexByte(requestHost, '.')
slashIdx := strings.IndexByte(requestHost, '/')
if dotIdx > 0 && (slashIdx == -1 || slashIdx > dotIdx) {
// if "." was found anywhere but not at the first path segment (host).
} else {
continue
}
// continue to that, any subdomain is valid.
} else if !strings.HasPrefix(requestHost, t.Subdomain) { // t.Subdomain contains the dot.
continue
}
}
handlers := t.Nodes.Find(path, ctx.Params())
if len(handlers) > 0 {
ctx.Do(handlers)
// found
return
}
// not found or method not allowed.
break
}
if ctx.Application().ConfigurationReadOnly().GetFireMethodNotAllowed() {
var methodAllowed string
for i := range h.trees {
t := h.trees[i]
methodAllowed = t.Method // keep track of the allowed method of the last checked tree
if ctx.Method() != methodAllowed {
continue
}
}
// RCF rfc2616 https://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html
// The response MUST include an Allow header containing a list of valid methods for the requested resource.
ctx.Header("Allow", methodAllowed)
ctx.StatusCode(http.StatusMethodNotAllowed)
return
}
ctx.StatusCode(http.StatusNotFound)
}