(#1554) Add support for all common compressions (write and read)

- Remove the context.Context interface and export the *context, the iris.Context now points to the pointer\nSupport compression and rate limiting in the FileServer\nBit of code organisation


Former-commit-id: ad1c61bf968059510c6be9e7f2cceec7da70ba17

_examples/request-body/read-gzip/main.go

@@ -1,44 +0,0 @@
-package main
-
-import (
-	"github.com/kataras/iris/v12"
-)
-
-func main() {
-	app := newApp()
-	app.Logger().SetLevel("debug")
-
-	app.Listen(":8080")
-}
-
-type payload struct {
-	Message string `json:"message"`
-}
-
-func newApp() *iris.Application {
-	app := iris.New()
-
-	// GzipReader is a middleware which enables gzip decompression,
-	// when client sends gzip compressed data.
-	//
-	// A shortcut of:
-	// func(ctx iris.Context) {
-	//	ctx.GzipReader(true)
-	//	ctx.Next()
-	// }
-	app.Use(iris.GzipReader)
-
-	app.Post("/", func(ctx iris.Context) {
-		// Bind incoming gzip compressed JSON to "p".
-		var p payload
-		if err := ctx.ReadJSON(&p); err != nil {
-			ctx.StopWithError(iris.StatusBadRequest, err)
-			return
-		}
-
-		// Send back the message as plain text.
-		ctx.WriteString(p.Message)
-	})
-
-	return app
-}

_examples/request-body/read-gzip/main_test.go

@@ -1,38 +0,0 @@
-package main
-
-import (
-	"bytes"
-	"compress/gzip"
-	"encoding/json"
-	"testing"
-
-	"github.com/kataras/iris/v12/httptest"
-)
-
-func TestGzipReader(t *testing.T) {
-	app := newApp()
-
-	expected := payload{Message: "test"}
-	b, err := json.Marshal(expected)
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	buf := new(bytes.Buffer)
-	w := gzip.NewWriter(buf)
-	_, err = w.Write(b)
-	if err != nil {
-		t.Fatal(err)
-	}
-	err = w.Close()
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	e := httptest.New(t, app)
-	// send gzip compressed.
-	e.POST("/").WithHeader("Content-Encoding", "gzip").WithHeader("Content-Type", "application/json").
-		WithBytes(buf.Bytes()).Expect().Status(httptest.StatusOK).Body().Equal(expected.Message)
-	// raw.
-	e.POST("/").WithJSON(expected).Expect().Status(httptest.StatusOK).Body().Equal(expected.Message)
-}