Fix recovery middleware to render gitea style page. (#13857)

* Some changes to fix recovery

* Move Recovery to middlewares

* Remove trace code

* Fix lint

* add session middleware and remove dependent on macaron for sso

* Fix panic 500 page rendering

* Fix bugs

* Fix fmt

* Fix vendor

* recover unnecessary change

* Fix lint and addd some comments about the copied codes.

* Use util.StatDir instead of com.StatDir

Co-authored-by: 6543 <6543@obermui.de>

vendor/github.com/unrolled/render/engine.go

@@ -0,0 +1,217 @@
+package render
+
+import (
+	"bytes"
+	"encoding/json"
+	"encoding/xml"
+	"html/template"
+	"io"
+	"net/http"
+)
+
+// Engine is the generic interface for all responses.
+type Engine interface {
+	Render(io.Writer, interface{}) error
+}
+
+// Head defines the basic ContentType and Status fields.
+type Head struct {
+	ContentType string
+	Status      int
+}
+
+// Data built-in renderer.
+type Data struct {
+	Head
+}
+
+// HTML built-in renderer.
+type HTML struct {
+	Head
+	Name      string
+	Templates *template.Template
+}
+
+// JSON built-in renderer.
+type JSON struct {
+	Head
+	Indent        bool
+	UnEscapeHTML  bool
+	Prefix        []byte
+	StreamingJSON bool
+}
+
+// JSONP built-in renderer.
+type JSONP struct {
+	Head
+	Indent   bool
+	Callback string
+}
+
+// Text built-in renderer.
+type Text struct {
+	Head
+}
+
+// XML built-in renderer.
+type XML struct {
+	Head
+	Indent bool
+	Prefix []byte
+}
+
+// Write outputs the header content.
+func (h Head) Write(w http.ResponseWriter) {
+	w.Header().Set(ContentType, h.ContentType)
+	w.WriteHeader(h.Status)
+}
+
+// Render a data response.
+func (d Data) Render(w io.Writer, v interface{}) error {
+	if hw, ok := w.(http.ResponseWriter); ok {
+		c := hw.Header().Get(ContentType)
+		if c != "" {
+			d.Head.ContentType = c
+		}
+		d.Head.Write(hw)
+	}
+
+	w.Write(v.([]byte))
+	return nil
+}
+
+// Render a HTML response.
+func (h HTML) Render(w io.Writer, binding interface{}) error {
+	// Retrieve a buffer from the pool to write to.
+	out := bufPool.Get()
+	err := h.Templates.ExecuteTemplate(out, h.Name, binding)
+	if err != nil {
+		return err
+	}
+
+	if hw, ok := w.(http.ResponseWriter); ok {
+		h.Head.Write(hw)
+	}
+	out.WriteTo(w)
+
+	// Return the buffer to the pool.
+	bufPool.Put(out)
+	return nil
+}
+
+// Render a JSON response.
+func (j JSON) Render(w io.Writer, v interface{}) error {
+	if j.StreamingJSON {
+		return j.renderStreamingJSON(w, v)
+	}
+
+	var result []byte
+	var err error
+
+	if j.Indent {
+		result, err = json.MarshalIndent(v, "", "  ")
+		result = append(result, '\n')
+	} else {
+		result, err = json.Marshal(v)
+	}
+	if err != nil {
+		return err
+	}
+
+	// Unescape HTML if needed.
+	if j.UnEscapeHTML {
+		result = bytes.Replace(result, []byte("\\u003c"), []byte("<"), -1)
+		result = bytes.Replace(result, []byte("\\u003e"), []byte(">"), -1)
+		result = bytes.Replace(result, []byte("\\u0026"), []byte("&"), -1)
+	}
+
+	// JSON marshaled fine, write out the result.
+	if hw, ok := w.(http.ResponseWriter); ok {
+		j.Head.Write(hw)
+	}
+	if len(j.Prefix) > 0 {
+		w.Write(j.Prefix)
+	}
+	w.Write(result)
+	return nil
+}
+
+func (j JSON) renderStreamingJSON(w io.Writer, v interface{}) error {
+	if hw, ok := w.(http.ResponseWriter); ok {
+		j.Head.Write(hw)
+	}
+	if len(j.Prefix) > 0 {
+		w.Write(j.Prefix)
+	}
+
+	return json.NewEncoder(w).Encode(v)
+}
+
+// Render a JSONP response.
+func (j JSONP) Render(w io.Writer, v interface{}) error {
+	var result []byte
+	var err error
+
+	if j.Indent {
+		result, err = json.MarshalIndent(v, "", "  ")
+	} else {
+		result, err = json.Marshal(v)
+	}
+	if err != nil {
+		return err
+	}
+
+	// JSON marshaled fine, write out the result.
+	if hw, ok := w.(http.ResponseWriter); ok {
+		j.Head.Write(hw)
+	}
+	w.Write([]byte(j.Callback + "("))
+	w.Write(result)
+	w.Write([]byte(");"))
+
+	// If indenting, append a new line.
+	if j.Indent {
+		w.Write([]byte("\n"))
+	}
+	return nil
+}
+
+// Render a text response.
+func (t Text) Render(w io.Writer, v interface{}) error {
+	if hw, ok := w.(http.ResponseWriter); ok {
+		c := hw.Header().Get(ContentType)
+		if c != "" {
+			t.Head.ContentType = c
+		}
+		t.Head.Write(hw)
+	}
+
+	w.Write([]byte(v.(string)))
+	return nil
+}
+
+// Render an XML response.
+func (x XML) Render(w io.Writer, v interface{}) error {
+	var result []byte
+	var err error
+
+	if x.Indent {
+		result, err = xml.MarshalIndent(v, "", "  ")
+		result = append(result, '\n')
+	} else {
+		result, err = xml.Marshal(v)
+	}
+	if err != nil {
+		return err
+	}
+
+	// XML marshaled fine, write out the result.
+	if hw, ok := w.(http.ResponseWriter); ok {
+		x.Head.Write(hw)
+	}
+	if len(x.Prefix) > 0 {
+		w.Write(x.Prefix)
+	}
+	w.Write(result)
+	return nil
+}