new feature: handle different param types in the exact same path pattern

implements https://github.com/kataras/iris/issues/1315


Former-commit-id: 3e9276f2a95d6fc7c10fbf91186d041dcba72611

HISTORY.md

@@ -19,15 +19,16 @@
 
 Developers are not forced to upgrade if they don't really need it. Upgrade whenever you feel ready.
 
-**How to upgrade**: Open your command-line and execute this command: `go get github.com/kataras/iris@v11.2.0`.
+**How to upgrade**: Open your command-line and execute this command: `go get github.com/kataras/iris@master`.
 
+# Tu, 30 July 2019 | v11.2.3
 
-# We, 24 July 2019 | v11.2.1
+TODO:
 
-- https://github.com/kataras/iris/issues/1298
+- Different parameter types in the same path (done).
-- https://github.com/kataras/iris/issues/1207
+- [Content negotiation](https://developer.mozilla.org/en-US/docs/Web/HTTP/Content_negotiation) (in-progress)
 
-## v11.2.2
+# We, 24 July 2019 | v11.2.2
 
 Sessions as middleware:
 
@@ -47,6 +48,11 @@ app.Get("/path", func(ctx iris.Context){
 - Add `Session.Len() int` to return the total number of stored values/entries.
 - Make `Context.HTML` and `Context.Text` to accept an optional, variadic, `args ...interface{}` input arg(s) too.
 
+## v11.1.1
+
+- https://github.com/kataras/iris/issues/1298
+- https://github.com/kataras/iris/issues/1207
+
 # Tu, 23 July 2019 | v11.2.0
 
 Read about the new release at: https://dev.to/kataras/iris-version-11-2-released-22bc

_examples/miscellaneous/pprof/main.go

@@ -13,7 +13,9 @@ func main() {
 		ctx.HTML("<h1> Please click <a href='/debug/pprof'>here</a>")
 	})
 
-	app.Any("/debug/pprof/{action:path}", pprof.New())
+	p := pprof.New()
+	app.Any("/debug/pprof", p)
+	app.Any("/debug/pprof/{action:path}", p)
 	//                              ___________
 	app.Run(iris.Addr(":8080"))
 }

_examples/routing/basic/main.go

@@ -6,6 +6,7 @@ import (
 
 func main() {
 	app := iris.New()
+	app.Logger().SetLevel("debug")
 
 	// registers a custom handler for 404 not found http (error) status code,
 	// fires when route not found or manually by ctx.StatusCode(iris.StatusNotFound).
@@ -26,6 +27,42 @@ func main() {
 		ctx.Writef(`Same as app.Handle("GET", "/", [...])`)
 	})
 
+	// Different path parameters types in the same path.
+	app.Get("/u/{username:string}", func(ctx iris.Context) {
+		ctx.Writef("before username (string), current route name: %s\n", ctx.RouteName())
+		ctx.Next()
+	}, func(ctx iris.Context) {
+		ctx.Writef("username (string): %s", ctx.Params().Get("username"))
+	})
+
+	app.Get("/u/{id:int}", func(ctx iris.Context) {
+		ctx.Writef("before id (int), current route name: %s\n", ctx.RouteName())
+		ctx.Next()
+	}, func(ctx iris.Context) {
+		ctx.Writef("id (int): %d", ctx.Params().GetIntDefault("id", 0))
+	})
+
+	app.Get("/u/{uid:uint}", func(ctx iris.Context) {
+		ctx.Writef("before uid (uint), current route name: %s\n", ctx.RouteName())
+		ctx.Next()
+	}, func(ctx iris.Context) {
+		ctx.Writef("uid (uint): %d", ctx.Params().GetUintDefault("uid", 0))
+	})
+
+	app.Get("/u/{firstname:alphabetical}", func(ctx iris.Context) {
+		ctx.Writef("before firstname (alphabetical), current route name: %s\n", ctx.RouteName())
+		ctx.Next()
+	}, func(ctx iris.Context) {
+		ctx.Writef("firstname (alphabetical): %s", ctx.Params().Get("firstname"))
+	})
+
+	/*
+		/u/abcd maps to :alphabetical (if :alphabetical registered otherwise :string)
+		/u/42 maps to :uint (if :uint registered otherwise :int)
+		/u/-1 maps to :int (if :int registered otherwise :string)
+		/u/abcd123 maps to :string
+	*/
+
 	app.Get("/donate", donateHandler, donateFinishHandler)
 
 	// Pssst, don't forget dynamic-path example for more "magic"!
@@ -128,6 +165,11 @@ func main() {
 	// http://localhost:8080/api/users/blabla
 	// http://localhost:8080/wontfound
 	//
+	// http://localhost:8080/u/abcd
+	// http://localhost:8080/u/42
+	// http://localhost:8080/u/-1
+	// http://localhost:8080/u/abcd123
+	//
 	// if hosts edited:
 	//  http://v1.localhost:8080
 	//  http://v1.localhost:8080/api/users

core/router/api_builder.go

@@ -10,6 +10,7 @@ import (
 	"github.com/kataras/iris/context"
 	"github.com/kataras/iris/core/errors"
 	"github.com/kataras/iris/macro"
+	macroHandler "github.com/kataras/iris/macro/handler"
 )
 
 // MethodNone is a Virtual method
@@ -109,6 +110,20 @@ func (repo *repository) get(routeName string) *Route {
 	return nil
 }
 
+func (repo *repository) getRelative(r *Route) *Route {
+	if r.tmpl.IsTrailing() || !macroHandler.CanMakeHandler(r.tmpl) {
+		return nil
+	}
+
+	for _, route := range repo.routes {
+		if r.Subdomain == route.Subdomain && r.Method == route.Method && r.FormattedPath == route.FormattedPath && !route.tmpl.IsTrailing() {
+			return route
+		}
+	}
+
+	return nil
+}
+
 func (repo *repository) getByPath(tmplPath string) *Route {
 	if repo.pos != nil {
 		if idx, ok := repo.pos[tmplPath]; ok {
@@ -345,6 +360,8 @@ func (api *APIBuilder) Handle(method string, relativePath string, handlers ...co
 	var route *Route // the last one is returned.
 	for _, route = range routes {
 		// global
+
+		route.topLink = api.routes.getRelative(route)
 		api.routes.register(route)
 	}
 

core/router/handler.go

@@ -5,11 +5,12 @@ import (
 	"sort"
 	"strings"
 
-	"github.com/kataras/golog"
-
 	"github.com/kataras/iris/context"
 	"github.com/kataras/iris/core/errors"
 	"github.com/kataras/iris/core/netutil"
+	macroHandler "github.com/kataras/iris/macro/handler"
+
+	"github.com/kataras/golog"
 )
 
 // RequestHandler the middle man between acquiring a context and releasing it.
@@ -116,29 +117,63 @@ func (h *routerHandler) Build(provider RoutesProvider) error {
 	})
 
 	for _, r := range registeredRoutes {
-		// build the r.Handlers based on begin and done handlers, if any.
+		if r.topLink != nil {
-		r.BuildHandlers()
+			bindMultiParamTypesHandler(r.topLink, r)
+		}
+	}
 
+	for _, r := range registeredRoutes {
 		if r.Subdomain != "" {
 			h.hosts = true
 		}
 
-		// the only "bad" with this is if the user made an error
+		if r.topLink == nil {
-		// on route, it will be stacked shown in this build state
+			// build the r.Handlers based on begin and done handlers, if any.
-		// and no in the lines of the user's action, they should read
+			r.BuildHandlers()
-		// the docs better. Or TODO: add a link here in order to help new users.
+
-		if err := h.addRoute(r); err != nil {
+			// the only "bad" with this is if the user made an error
-			// node errors:
+			// on route, it will be stacked shown in this build state
-			rp.Add("%v -> %s", err, r.String())
+			// and no in the lines of the user's action, they should read
-			continue
+			// the docs better. Or TODO: add a link here in order to help new users.
+			if err := h.addRoute(r); err != nil {
+				// node errors:
+				rp.Add("%v -> %s", err, r.String())
+				continue
+			}
 		}
 
-		golog.Debugf(r.Trace())
+		golog.Debugf(r.Trace()) // keep log different parameter types in the same path as different routes.
 	}
 
 	return rp.Return()
 }
 
+func bindMultiParamTypesHandler(top *Route, r *Route) {
+	r.BuildHandlers()
+
+	h := r.Handlers[1:] // remove the macro evaluator handler as we manually check below.
+	f := macroHandler.MakeFilter(r.tmpl)
+	if f == nil {
+		return // should never happen, previous checks made to set the top link.
+	}
+
+	decisionHandler := func(ctx context.Context) {
+		currentRouteName := ctx.RouteName()
+		if f(ctx) {
+			ctx.SetCurrentRouteName(r.Name)
+			ctx.HandlerIndex(0)
+			ctx.Do(h)
+			return
+		}
+
+		ctx.SetCurrentRouteName(currentRouteName)
+		ctx.StatusCode(http.StatusOK)
+		ctx.Next()
+	}
+
+	r.topLink.beginHandlers = append(context.Handlers{decisionHandler}, r.topLink.beginHandlers...)
+}
+
 func (h *routerHandler) HandleRequest(ctx context.Context) {
 	method := ctx.Method()
 	path := ctx.Path()

core/router/route.go

@@ -40,6 +40,8 @@ type Route struct {
 	// route, manually or automatic by the framework,
 	// get the route by `Application#GetRouteByPath(staticSite.RequestPath)`.
 	StaticSites []context.StaticSite `json:"staticSites"`
+
+	topLink *Route
 }
 
 // NewRoute returns a new route based on its method,

doc.go

@@ -38,13 +38,13 @@ Source code and other details for the project are available at GitHub:
 
 Current Version
 
-11.2.2
+11.2.3
 
 Installation
 
 The only requirement is the Go Programming Language, at least version 1.12.
 
-    $ go get github.com/kataras/iris@v11.2.2
+    $ go get github.com/kataras/iris@master
 
 Wiki:
 

iris.go

@@ -37,7 +37,7 @@ import (
 
 var (
 	// Version is the current version number of the Iris Web Framework.
-	Version = "11.2.2"
+	Version = "11.2.3"
 )
 
 // HTTP status codes as registered with IANA.

macro/handler/handler.go

@@ -34,23 +34,54 @@ func CanMakeHandler(tmpl macro.Template) (needsMacroHandler bool) {
 // If the template does not contain any dynamic attributes and a special handler is NOT required
 // then it returns a nil handler.
 func MakeHandler(tmpl macro.Template) context.Handler {
+	filter := MakeFilter(tmpl)
+
+	return func(ctx context.Context) {
+		if !filter(ctx) {
+			ctx.StopExecution()
+			return
+		}
+
+		// if all passed, just continue.
+		ctx.Next()
+	}
+}
+
+// MakeFilter returns a Filter which reports whether a specific macro template
+// and its parameters pass the serve-time validation.
+func MakeFilter(tmpl macro.Template) context.Filter {
 	if !CanMakeHandler(tmpl) {
 		return nil
 	}
 
-	return func(ctx context.Context) {
+	return func(ctx context.Context) bool {
 		for _, p := range tmpl.Params {
 			if !p.CanEval() {
 				continue // allow.
 			}
 
-			if !p.Eval(ctx.Params().Get(p.Name), &ctx.Params().Store) {
+			// 07-29-2019
+			// changed to retrieve by param index in order to support
+			// different parameter names for routes with
+			// different param types (and probably different param names i.e {name:string}, {id:uint64})
+			// in the exact same path pattern.
+			//
+			// Same parameter names are not allowed, different param types in the same path
+			// should have different name e.g. {name} {id:uint64};
+			// something like {name} and {name:uint64}
+			// is bad API design and we do NOT allow it by-design.
+			entry, found := ctx.Params().Store.GetEntryAt(p.Index)
+			if !found {
+				// should never happen.
+				return false
+			}
+
+			if !p.Eval(entry.String(), &ctx.Params().Store) {
 				ctx.StatusCode(p.ErrCode)
-				ctx.StopExecution()
+				return false
-				return
 			}
 		}
-		// if all passed, just continue.
+
-		ctx.Next()
+		return true
 	}
 }

macro/template.go

@@ -20,6 +20,11 @@ type Template struct {
 	Params []TemplateParam `json:"params"`
 }
 
+// IsTrailing reports whether this Template is a traling one.
+func (t *Template) IsTrailing() bool {
+	return len(t.Params) > 0 && ast.IsTrailing(t.Params[len(t.Params)-1].Type)
+}
+
 // TemplateParam is the parsed macro parameter's template
 // they are being used to describe the param's syntax result.
 type TemplateParam struct {