complete the versioning/README.md and add AllowMethods like the normal Party, version-specific middlewares are not needed because the end-developer should declare a middleware with manual matching of version using versioning.Match(ctx, version) bool instead

Former-commit-id: 4f4c23dd7c043d5ab735070ae4d59ea84e3af2e0

versioning/README.md

@@ -58,9 +58,75 @@ userAPI.Get("/", myMiddleware, versioning.NewMatcher(versioning.Map{
 }))
 ```
 
-## Grouping versioned routes
+### Deprecation
 
-Impl & tests done, example not. **TODO**
+Using the `versioning.Deprecated(handler iris.Handler, options versioning.DeprecationOptions) iris.Handler` function you can mark a specific handler version as deprecated.
+
+
+```go
+v10Handler := versioning.Deprecated(sendHandler(v10Response), versioning.DeprecationOptions{
+    // if empty defaults to: "WARNING! You are using a deprecated version of this API."
+    WarnMessage string 
+    DeprecationDate time.Time
+    DeprecationInfo string
+})
+
+userAPI.Get("/", versioning.NewMatcher(versioning.Map{
+    "1.0": v10Handler,
+    // [...]
+}))
+```
+
+This will make the handler to send these headers to the client:
+
+- `"X-API-Warn": options.WarnMessage`
+- `"X-API-Deprecation-Date": context.FormatTime(ctx, options.DeprecationDate))`
+- `"X-API-Deprecation-Info": options.DeprecationInfo`
+
+> versioning.DefaultDeprecationOptions can be passed instead if you don't care about Date and Info.
+
+## Grouping routes by version
+
+Grouping routes by version is possible as well.
+
+Using the `versioning.NewGroup(version string) *versioning.Group` function you can create a group to register your versioned routes.
+The `versioning.RegisterGroups(r iris.Party, groups ...*versioning.Group)` must be called in the end in order to register the routes to a specific `Party`.
+
+```go
+app := iris.New()
+
+userAPI := app.Party("/api/user")
+// [... static serving, middlewares and etc goes here].
+
+userAPIV10 := versioning.NewGroup("1.0")
+userAPIV10.Get("/", sendHandler(v10Response))
+
+userAPIV2 := versioning.NewGroup(">= 2, < 3")
+userAPIV2.Get("/", sendHandler(v2Response))
+userAPIV2.Post("/", sendHandler(v2Response))
+userAPIV2.Put("/other", sendHandler(v2Response))
+
+versioning.RegisterGroups(userAPI, userAPIV10, userAPIV2)
+```
+
+### Deprecation for Group
+
+Just call the `Deprecated(versioning.DeprecationOptions)` on the group you want to notify your API consumers that this specific version is deprecated.
+
+```go
+userAPIV10 := versioning.NewGroup("1.0").Deprecated(versioning.DefaultDeprecationOptions)
+```
+
+### Version not found for Groups
+
+In order to register a custom version not found handler you have to use the `versioning.Concat` first, which gives you the API to add a version not found handler.
+
+```go
+versioning.Concat(userAPIV10, userAPIV2).NotFound(func(ctx iris.Context) {
+    ctx.StatusCode(iris.StatusNotFound)
+    ctx.Writef("unknown version %s", versioning.GetVersion(ctx))
+}).For(userAPI)
+```
 
 ## Compare version manually from inside your handlers
 

versioning/group.go

@@ -18,6 +18,7 @@ type (
 
 	Group struct {
 		version      string
+		extraMethods []string
 		routes       []vroute
 
 		deprecation DeprecationOptions
@@ -46,21 +47,40 @@ func (g *Group) Deprecated(options DeprecationOptions) *Group {
 	return g
 }
 
-// Handle registers a versioned route to the group.
-//
-// See `Concat` and `RegisterGroups` for more.
-func (g *Group) Handle(method string, registeredPath string, handler context.Handler) {
-	if g.deprecation.ShouldHandle() { // if `Deprecated` called first.
-		handler = Deprecated(handler, g.deprecation)
+func (g *Group) AllowMethods(methods ...string) *Group {
+	g.extraMethods = append(g.extraMethods, methods...)
+	return g
+}
+
+func (g *Group) addVRoute(method, path string, handler context.Handler) {
+	for _, r := range g.routes { // check if already exists.
+		if r.method == method && r.path == path {
+			return
+		}
 	}
 
 	g.routes = append(g.routes, vroute{
 		method:   method,
-		path:     registeredPath,
+		path:     path,
 		versions: Map{g.version: handler},
 	})
 }
 
+// Handle registers a versioned route to the group.
+//
+// See `Concat` and `RegisterGroups` for more.
+func (g *Group) Handle(method string, path string, handler context.Handler) {
+	if g.deprecation.ShouldHandle() { // if `Deprecated` called first.
+		handler = Deprecated(handler, g.deprecation)
+	}
+
+	methods := append(g.extraMethods, method)
+
+	for _, method := range methods {
+		g.addVRoute(method, path, handler)
+	}
+}
+
 // None registers an "offline" versioned route
 // see `context#ExecRoute(routeName)` and routing examples.
 func (g *Group) None(path string, handler context.Handler) {

versioning/versioning_test.go

@@ -86,7 +86,7 @@ func TestNewGroup(t *testing.T) {
 	userAPIV2.Post("/", sendHandler(v2Response))
 	userAPIV2.Put("/other", sendHandler(v2Response))
 
-	// versioning.Concat(userAPIV10, userAPIV2)
+	// versioning.Concat(userAPIV10, userAPIV2).
 	// 	NotFound(func(ctx iris.Context) {
 	// 		ctx.StatusCode(iris.StatusNotFound)
 	// 		ctx.Writef("unknown version %s", versioning.GetVersion(ctx))