Added new error page

internal/handler/mock/middleware.go

@@ -58,7 +58,7 @@ func (m *Middleware) ServeHTTP(writer http.ResponseWriter, request *http.Request
 	}
 
 	if err != nil {
-		http.Error(writer, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
+		infrastructure.HTTPError(writer, err)
 
 		return
 	}

internal/handler/proxy/middleware.go

@@ -5,10 +5,11 @@ import (
 	"net/http"
 	"strings"
 
+	"github.com/evg4b/uncors/internal/infrastructure"
+
 	"github.com/evg4b/uncors/internal/contracts"
 	"github.com/evg4b/uncors/internal/helpers"
 	"github.com/evg4b/uncors/internal/urlreplacer"
-	"github.com/pterm/pterm"
 )
 
 type Handler struct {
@@ -33,9 +34,7 @@ func NewProxyHandler(options ...HandlerOption) *Handler {
 
 func (m *Handler) ServeHTTP(response http.ResponseWriter, request *http.Request) {
 	if err := m.handle(response, request); err != nil {
-		pterm.Error.Printfln("UNCORS error: %v", err)
-		response.WriteHeader(http.StatusInternalServerError)
-		fmt.Fprintln(response, "UNCORS error:", err.Error())
+		infrastructure.HTTPError(response, err)
 	}
 }
 

internal/handler/static/middleware.go

@@ -9,6 +9,8 @@ import (
 	"path"
 	"strings"
 
+	"github.com/evg4b/uncors/internal/infrastructure"
+
 	"github.com/evg4b/uncors/internal/contracts"
 
 	"github.com/spf13/afero"
@@ -34,14 +36,6 @@ func NewStaticMiddleware(options ...MiddlewareOption) *Middleware {
 	return middleware
 }
 
-func toHTTPError(err error) (string, int) {
-	if errors.Is(err, fs.ErrPermission) {
-		return http.StatusText(http.StatusForbidden), http.StatusForbidden
-	}
-
-	return http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError
-}
-
 func (m *Middleware) ServeHTTP(writer http.ResponseWriter, request *http.Request) {
 	filePath := m.extractFilePath(request)
 
@@ -56,8 +50,7 @@ func (m *Middleware) ServeHTTP(writer http.ResponseWriter, request *http.Request
 		if errors.Is(err, errNorHandled) {
 			m.next.ServeHTTP(writer, request)
 		} else {
-			msg, code := toHTTPError(err)
-			http.Error(writer, msg, code)
+			infrastructure.HTTPError(writer, err)
 		}
 
 		return

internal/handler/uncors_handler_test.go

@@ -184,7 +184,8 @@ func TestUncorsRequestHandler(t *testing.T) {
 				hand.ServeHTTP(recorder, request)
 
 				assert.Equal(t, http.StatusInternalServerError, recorder.Code)
-				assert.Contains(t, testutils.ReadBody(t, recorder), "Internal Server Error")
+				expectedMessage := "filed to opend index file: open /assets/index.php: file does not exist"
+				assert.Contains(t, testutils.ReadBody(t, recorder), expectedMessage)
 			})
 		})
 
@@ -282,7 +283,8 @@ func TestUncorsRequestHandler(t *testing.T) {
 			hand.ServeHTTP(recorder, request)
 
 			assert.Equal(t, http.StatusInternalServerError, recorder.Code)
-			assert.Contains(t, testutils.ReadBody(t, recorder), "Internal Server Error")
+			expectedMessage := "filed to opent file /unknown.json: open /unknown.json: file does not exist"
+			assert.Contains(t, testutils.ReadBody(t, recorder), expectedMessage)
 		})
 	})
 }

internal/infrastructure/http_error.go

@@ -0,0 +1,44 @@
+package infrastructure
+
+import (
+	"fmt"
+	"io"
+	"net/http"
+
+	"github.com/go-http-utils/headers"
+	"github.com/pterm/pterm"
+	"github.com/pterm/pterm/putils"
+	"github.com/samber/lo"
+)
+
+var style = pterm.Style{}
+
+func HTTPError(writer http.ResponseWriter, err error) {
+	header := writer.Header()
+	header.Set(headers.ContentType, "text/plain; charset=utf-8")
+	header.Set(headers.XContentTypeOptions, "nosniff")
+
+	writer.WriteHeader(http.StatusInternalServerError)
+	message := fmt.Sprintf("%d Error", http.StatusInternalServerError)
+
+	writeLine(writer)
+	writeLine(writer, pageHeader(message))
+	writeLine(writer)
+	writeLine(writer, fmt.Sprintf("Occurred error: %s", err))
+}
+
+func pageHeader(message string) string {
+	letters := putils.LettersFromStringWithStyle(message, &style)
+	text, err := pterm.DefaultBigText.WithLetters(letters).Srender()
+	if err != nil {
+		panic(err)
+	}
+
+	return text
+}
+
+func writeLine(writer io.Writer, data ...string) {
+	if _, err := fmt.Fprintln(writer, lo.ToAnySlice(data)...); err != nil {
+		panic(err)
+	}
+}

internal/infrastructure/http_error_test.go

@@ -0,0 +1,40 @@
+package infrastructure_test
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/go-http-utils/headers"
+
+	"github.com/evg4b/uncors/internal/infrastructure"
+	"github.com/evg4b/uncors/testing/testutils"
+	"github.com/stretchr/testify/assert"
+)
+
+const expectedPage = `
+███████  ██████   ██████      ███████ ██████  ██████   ██████  ██████  
+██      ██  ████ ██  ████     ██      ██   ██ ██   ██ ██    ██ ██   ██ 
+███████ ██ ██ ██ ██ ██ ██     █████   ██████  ██████  ██    ██ ██████  
+     ██ ████  ██ ████  ██     ██      ██   ██ ██   ██ ██    ██ ██   ██ 
+███████  ██████   ██████      ███████ ██   ██ ██   ██  ██████  ██   ██ 
+
+
+Occurred error: net/http: abort Handler
+`
+
+func TestHttpError(t *testing.T) {
+	recorder := httptest.NewRecorder()
+	infrastructure.HTTPError(recorder, http.ErrAbortHandler)
+
+	t.Run("write correct page", func(t *testing.T) {
+		assert.Equal(t, expectedPage, testutils.ReadBody(t, recorder))
+	})
+
+	t.Run("write correct headers", func(t *testing.T) {
+		header := recorder.Header()
+
+		assert.NotNil(t, header[headers.ContentType])
+		assert.NotNil(t, header[headers.XContentTypeOptions])
+	})
+}