add content negotiation feature, add context.ReadYAML and fix https://github.com/kataras/neffos/issues/1#issuecomment-515698536

Former-commit-id: 9753e3e45c7c24788b97814d3ecfb4b03f5ff414

_examples/README.md

@@ -224,6 +224,7 @@ You can serve [quicktemplate](https://github.com/valyala/quicktemplate) and [her
 - [Read JSON](http_request/read-json/main.go)
     * [Struct Validation](http_request/read-json-struct-validation/main.go)
 - [Read XML](http_request/read-xml/main.go)
+- [Read YAML](http_request/read-yaml/main.go) **NEW**
 - [Read Form](http_request/read-form/main.go)
 - [Read Query](http_request/read-query/main.go) **NEW**
 - [Read Custom per type](http_request/read-custom-per-type/main.go)
@@ -237,6 +238,7 @@ You can serve [quicktemplate](https://github.com/valyala/quicktemplate) and [her
 
 ### How to Write to `context.ResponseWriter() http.ResponseWriter`
 
+- [Content Negotiation](http_responsewriter/content-negotiation) **NEW**
 - [Write `valyala/quicktemplate` templates](http_responsewriter/quicktemplate)
 - [Write `shiyanhui/hero` templates](http_responsewriter/herotemplate)
 - [Text, Markdown, HTML, JSON, JSONP, XML, Binary](http_responsewriter/write-rest/main.go)

_examples/README_ZH.md

@@ -330,6 +330,7 @@ You can serve [quicktemplate](https://github.com/valyala/quicktemplate) and [her
 
 - [读取JSON](http_request/read-json/main.go)
 - [读取XML](http_request/read-xml/main.go)
+- [读取YAML](http_request/read-yaml/main.go) **更新**
 - [读取Form](http_request/read-form/main.go)
 - [读取Query](http_request/read-query/main.go) **更新**
 - [读取每个类型的自定义结果Custom per type](http_request/read-custom-per-type/main.go)
@@ -342,6 +343,7 @@ You can serve [quicktemplate](https://github.com/valyala/quicktemplate) and [her
 
 ### 如何写入`context.ResponseWriter() http.ResponseWriter`
 
+- [Content Negotiation](http_responsewriter/content-negotiation) **更新**
 - [`valyala/quicktemplate`模版](http_responsewriter/quicktemplate)
 - [`shiyanhui/hero`模版](http_responsewriter/herotemplate)
 - [Text, Markdown, HTML, JSON, JSONP, XML, Binary](http_responsewriter/write-rest/main.go)

_examples/http_request/read-yaml/main.go

@@ -0,0 +1,36 @@
+package main
+
+import (
+	"github.com/kataras/iris"
+)
+
+func newApp() *iris.Application {
+	app := iris.New()
+	app.Post("/", handler)
+
+	return app
+}
+
+// simple yaml stuff, read more at https://yaml.org/start.html
+type product struct {
+	Invoice  int     `yaml:"invoice"`
+	Tax      float32 `yaml:"tax"`
+	Total    float32 `yaml:"total"`
+	Comments string  `yaml:"comments"`
+}
+
+func handler(ctx iris.Context) {
+	var p product
+	if err := ctx.ReadYAML(&p); err != nil {
+		ctx.StatusCode(iris.StatusBadRequest)
+		ctx.WriteString(err.Error())
+		return
+	}
+
+	ctx.Writef("Received: %#+v", p)
+}
+
+func main() {
+	app := newApp()
+	app.Run(iris.Addr(":8080"))
+}

_examples/http_request/read-yaml/main_test.go

@@ -0,0 +1,24 @@
+package main
+
+import (
+	"testing"
+
+	"github.com/kataras/iris/httptest"
+)
+
+func TestReadYAML(t *testing.T) {
+	app := newApp()
+	e := httptest.New(t, app)
+
+	expectedResponse := `Received: main.product{Invoice:34843, Tax:251.42, Total:4443.52, Comments:"Late afternoon is best. Backup contact is Nancy Billsmer @ 338-4338."}`
+	send := `invoice: 34843
+tax  : 251.42
+total: 4443.52
+comments: >
+    Late afternoon is best.
+    Backup contact is Nancy
+    Billsmer @ 338-4338.`
+
+	e.POST("/").WithHeader("Content-Type", "application/x-yaml").WithBytes([]byte(send)).Expect().
+		Status(httptest.StatusOK).Body().Equal(expectedResponse)
+}

_examples/http_responsewriter/content-negotiation/main.go

@@ -0,0 +1,114 @@
+// Package main contains three different ways to render content based on the client's accepted.
+package main
+
+import "github.com/kataras/iris"
+
+type testdata struct {
+	Name string `json:"name" xml:"Name"`
+	Age  int    `json:"age" xml:"Age"`
+}
+
+func newApp() *iris.Application {
+	app := iris.New()
+	app.Logger().SetLevel("debug")
+
+	// app.Use(func(ctx iris.Context) {
+	// 	requestedMime := ctx.URLParamDefault("type", "application/json")
+	//
+	//  ctx.Negotiation().Accept.Override().MIME(requestedMime, nil)
+	// 	ctx.Next()
+	// })
+
+	app.Get("/resource", func(ctx iris.Context) {
+		data := testdata{
+			Name: "test name",
+			Age:  26,
+		}
+
+		// Server allows response only JSON and XML. These values
+		// are compared with the clients mime needs. Iris comes with default mime types responses
+		// but you can add a custom one by the `Negotiation().Mime(mime, content)` method,
+		// same for the "accept".
+		// You can also pass a custom ContentSelector(mime string) or ContentNegotiator to the
+		// `Context.Negotiate` method if you want to perform more advanced things.
+		//
+		//
+		// By-default the client accept mime is retrieved by the "Accept" header
+		// Indeed you can override or update it by `Negotiation().Accept.XXX` i.e
+		// ctx.Negotiation().Accept.Override().XML()
+		//
+		// All these values can change inside middlewares, the `Negotiation().Override()` and `.Accept.Override()`
+		// can override any previously set values.
+		// Order matters, if the client accepts anything (*/*)
+		// then the first prioritized mime's response data will be rendered.
+		ctx.Negotiation().JSON().XML()
+		// Accept-Charset vs:
+		ctx.Negotiation().Charset("utf-8", "iso-8859-7")
+		// Alternatively you can define the content/data per mime type
+		// anywhere in the handlers chain using the optional "v" variadic
+		// input argument of the Context.Negotiation().JSON,XML,YAML,Binary,Text,HTML(...) and e.t.c
+		// example (order matters):
+		// ctx.Negotiation().JSON(data).XML(data).Any("content for */*")
+		// ctx.Negotiate(nil)
+
+		// if not nil passed in the `Context.Negotiate` method
+		// then it overrides any contents made by the negotitation builder above.
+		_, err := ctx.Negotiate(data)
+		if err != nil {
+			ctx.Writef("%v", err)
+		}
+	})
+
+	app.Get("/resource2", func(ctx iris.Context) {
+		jsonAndXML := testdata{
+			Name: "test name",
+			Age:  26,
+		}
+
+		// I prefer that one, as it gives me the freedom to modify
+		// response data per accepted mime content type on middlewares as well.
+		ctx.Negotiation().
+			JSON(jsonAndXML).
+			XML(jsonAndXML).
+			HTML("<h1>Test Name</h1><h2>Age 26</h2>")
+
+		ctx.Negotiate(nil)
+	})
+
+	app.Get("/resource3", func(ctx iris.Context) {
+		// If that line is missing and the requested
+		// mime type of content is */* or application/xml or application/json
+		// then 406 Not Acceptable http error code will be rendered instead.
+		//
+		// We also add the "gzip" algorithm as an option to encode
+		// resources on send.
+		ctx.Negotiation().JSON().XML().HTML().EncodingGzip()
+
+		jsonAndXML := testdata{
+			Name: "test name",
+			Age:  26,
+		}
+
+		// Prefer that way instead of the '/resource2' above
+		// if "iris.N" is a static one and can be declared
+		// outside of a handler.
+		ctx.Negotiate(iris.N{
+			// Text: for text/plain,
+			// Markdown: for text/mardown,
+			// Binary: for application/octet-stream,
+			// YAML: for application/x-yaml,
+			// JSONP: for application/javascript
+			// Other: for anything else,
+			JSON: jsonAndXML,                          // for application/json
+			XML:  jsonAndXML,                          // for application/xml or text/xml
+			HTML: "<h1>Test Name</h1><h2>Age 26</h2>", // for text/html
+		})
+	})
+
+	return app
+}
+
+func main() {
+	app := newApp()
+	app.Run(iris.Addr(":8080"))
+}

_examples/http_responsewriter/content-negotiation/main_test.go

@@ -0,0 +1,78 @@
+package main
+
+import (
+	"bytes"
+	"compress/gzip"
+	"encoding/xml"
+	"io/ioutil"
+	"testing"
+
+	"github.com/kataras/iris/httptest"
+)
+
+func TestContentNegotiation(t *testing.T) {
+	var (
+		expectedJSONResponse = testdata{
+			Name: "test name",
+			Age:  26,
+		}
+		expectedXMLResponse, _ = xml.Marshal(expectedJSONResponse)
+		expectedHTMLResponse   = "<h1>Test Name</h1><h2>Age 26</h2>"
+	)
+
+	e := httptest.New(t, newApp())
+
+	e.GET("/resource").WithHeader("Accept", "application/json").
+		Expect().Status(httptest.StatusOK).
+		ContentType("application/json", "utf-8").
+		JSON().Equal(expectedJSONResponse)
+	e.GET("/resource").WithHeader("Accept", "application/xml").WithHeader("Accept-Charset", "iso-8859-7").
+		Expect().Status(httptest.StatusOK).
+		ContentType("application/xml", "iso-8859-7").
+		Body().Equal(string(expectedXMLResponse))
+
+	e.GET("/resource2").WithHeader("Accept", "application/json").
+		Expect().Status(httptest.StatusOK).
+		ContentType("application/json", "utf-8").
+		JSON().Equal(expectedJSONResponse)
+	e.GET("/resource2").WithHeader("Accept", "application/xml").
+		Expect().Status(httptest.StatusOK).
+		ContentType("application/xml", "utf-8").
+		Body().Equal(string(expectedXMLResponse))
+	e.GET("/resource2").WithHeader("Accept", "text/html").
+		Expect().Status(httptest.StatusOK).
+		ContentType("text/html", "utf-8").
+		Body().Equal(expectedHTMLResponse)
+
+	e.GET("/resource3").WithHeader("Accept", "application/json").
+		Expect().Status(httptest.StatusOK).
+		ContentType("application/json", "utf-8").
+		JSON().Equal(expectedJSONResponse)
+	e.GET("/resource3").WithHeader("Accept", "application/xml").
+		Expect().Status(httptest.StatusOK).
+		ContentType("application/xml", "utf-8").
+		Body().Equal(string(expectedXMLResponse))
+
+	// test html with "gzip" encoding algorithm.
+	rawGzipResponse := e.GET("/resource3").WithHeader("Accept", "text/html").
+		WithHeader("Accept-Encoding", "gzip").
+		Expect().Status(httptest.StatusOK).
+		ContentType("text/html", "utf-8").
+		ContentEncoding("gzip").
+		Body().Raw()
+
+	zr, err := gzip.NewReader(bytes.NewReader([]byte(rawGzipResponse)))
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	rawResponse, err := ioutil.ReadAll(zr)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if expected, got := expectedHTMLResponse, string(rawResponse); expected != got {
+		t.Fatalf("expected response to be:\n%s but got:\n%s", expected, got)
+	}
+
+}

_examples/websocket/basic/browser/index.html

@@ -53,6 +53,8 @@
         };
     }
 
+    const username = window.prompt("Your username?");
+
     async function runExample() {
         // You can omit the "default" and simply define only Events, the namespace will be an empty string"",
         // however if you decide to make any changes on this example make sure the changes are reflecting inside the ../server.go file as well.
@@ -70,6 +72,10 @@
                         addMessage(msg.Body);
                     }
                 }
+            },{
+                headers: {
+                    "X-Username": username,
+                }
             });
 
             // You can either wait to conenct or just conn.connect("connect")

_examples/websocket/basic/go-client/client.go

@@ -42,7 +42,10 @@ func main() {
 	ctx, cancel := context.WithDeadline(context.Background(), time.Now().Add(dialAndConnectTimeout))
 	defer cancel()
 
-	client, err := websocket.Dial(ctx, websocket.DefaultGorillaDialer, endpoint, clientEvents)
+	// username := "my_username"
+	// dialer := websocket.GobwasDialer(websocket.GobwasDialerOptions{Header: websocket.GobwasHeader{"X-Username": []string{username}}})
+	dialer := websocket.DefaultGobwasDialer
+	client, err := websocket.Dial(ctx, dialer, endpoint, clientEvents)
 	if err != nil {
 		panic(err)
 	}

_examples/websocket/basic/server.go

@@ -68,8 +68,17 @@ func main() {
 		SigningMethod: jwt.SigningMethodHS256,
 	})
 
+	idGen := func(ctx iris.Context) string {
+		if username := ctx.GetHeader("X-Username"); username != "" {
+			return username
+		}
+
+		return websocket.DefaultIDGenerator(ctx)
+	}
+
 	// serves the endpoint of ws://localhost:8080/echo
-	websocketRoute := app.Get("/echo", websocket.Handler(websocketServer))
+	// with optional custom ID generator.
+	websocketRoute := app.Get("/echo", websocket.Handler(websocketServer, idGen))
 
 	if enableJWT {
 		// Register the jwt middleware (on handshake):