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/.gitignore

@@ -0,0 +1,27 @@
+# Compiled Object files, Static and Dynamic libs (Shared Objects)
+*.o
+*.a
+*.so
+
+# Folders
+_obj
+_test
+
+# Architecture specific extensions/prefixes
+*.[568vq]
+[568vq].out
+
+*.cgo1.go
+*.cgo2.c
+_cgo_defun.c
+_cgo_gotypes.go
+_cgo_export.*
+
+_testmain.go
+
+*.exe
+*.test
+
+
+*.pem
+.DS_Store

vendor/github.com/unrolled/render/.travis.yml

@@ -0,0 +1,15 @@
+language: go
+
+go:
+  - 1.11.x
+  - 1.12.x
+  - tip
+
+env:
+  - GO111MODULE=on
+
+install:
+  - go mod download 
+
+script:
+  - go test -v -race -tags=integration

vendor/github.com/unrolled/render/LICENSE

@@ -0,0 +1,20 @@
+The MIT License (MIT)
+
+Copyright (c) 2014 Cory Jacobsen
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

vendor/github.com/unrolled/render/README.md

@@ -0,0 +1,508 @@
+# Render [![GoDoc](http://godoc.org/github.com/unrolled/render?status.svg)](http://godoc.org/github.com/unrolled/render) [![Build Status](https://travis-ci.org/unrolled/render.svg)](https://travis-ci.org/unrolled/render)
+
+Render is a package that provides functionality for easily rendering JSON, XML, text, binary data, and HTML templates. This package is based on the [Martini](https://github.com/go-martini/martini) [render](https://github.com/martini-contrib/render) work.
+
+## Block Deprecation Notice
+Go 1.6 introduces a new [block](https://github.com/golang/go/blob/release-branch.go1.6/src/html/template/example_test.go#L128) action. This conflicts with Render's included `block` template function. To provide an easy migration path, a new function was created called `partial`. It is a duplicate of the old `block` function. It is advised that all users of the `block` function update their code to avoid any issues in the future. Previous to Go 1.6, Render's `block` functionality will continue to work but a message will be logged urging you to migrate to the new `partial` function.
+
+## Usage
+Render can be used with pretty much any web framework providing you can access the `http.ResponseWriter` from your handler. The rendering functions simply wraps Go's existing functionality for marshaling and rendering data.
+
+- HTML: Uses the [html/template](http://golang.org/pkg/html/template/) package to render HTML templates.
+- JSON: Uses the [encoding/json](http://golang.org/pkg/encoding/json/) package to marshal data into a JSON-encoded response.
+- XML: Uses the [encoding/xml](http://golang.org/pkg/encoding/xml/) package to marshal data into an XML-encoded response.
+- Binary data: Passes the incoming data straight through to the `http.ResponseWriter`.
+- Text: Passes the incoming string straight through to the `http.ResponseWriter`.
+
+~~~ go
+// main.go
+package main
+
+import (
+    "encoding/xml"
+    "net/http"
+
+    "github.com/unrolled/render"  // or "gopkg.in/unrolled/render.v1"
+)
+
+type ExampleXml struct {
+    XMLName xml.Name `xml:"example"`
+    One     string   `xml:"one,attr"`
+    Two     string   `xml:"two,attr"`
+}
+
+func main() {
+    r := render.New()
+    mux := http.NewServeMux()
+
+    mux.HandleFunc("/", func(w http.ResponseWriter, req *http.Request) {
+        w.Write([]byte("Welcome, visit sub pages now."))
+    })
+
+    mux.HandleFunc("/data", func(w http.ResponseWriter, req *http.Request) {
+        r.Data(w, http.StatusOK, []byte("Some binary data here."))
+    })
+
+    mux.HandleFunc("/text", func(w http.ResponseWriter, req *http.Request) {
+        r.Text(w, http.StatusOK, "Plain text here")
+    })
+
+    mux.HandleFunc("/json", func(w http.ResponseWriter, req *http.Request) {
+        r.JSON(w, http.StatusOK, map[string]string{"hello": "json"})
+    })
+
+    mux.HandleFunc("/jsonp", func(w http.ResponseWriter, req *http.Request) {
+        r.JSONP(w, http.StatusOK, "callbackName", map[string]string{"hello": "jsonp"})
+    })
+
+    mux.HandleFunc("/xml", func(w http.ResponseWriter, req *http.Request) {
+        r.XML(w, http.StatusOK, ExampleXml{One: "hello", Two: "xml"})
+    })
+
+    mux.HandleFunc("/html", func(w http.ResponseWriter, req *http.Request) {
+        // Assumes you have a template in ./templates called "example.tmpl"
+        // $ mkdir -p templates && echo "<h1>Hello {{.}}.</h1>" > templates/example.tmpl
+        r.HTML(w, http.StatusOK, "example", "World")
+    })
+
+    http.ListenAndServe("127.0.0.1:3000", mux)
+}
+~~~
+
+~~~ html
+<!-- templates/example.tmpl -->
+<h1>Hello {{.}}.</h1>
+~~~
+
+### Available Options
+Render comes with a variety of configuration options _(Note: these are not the default option values. See the defaults below.)_:
+
+~~~ go
+// ...
+r := render.New(render.Options{
+    Directory: "templates", // Specify what path to load the templates from.
+    FileSystem: &LocalFileSystem{}, // Specify filesystem from where files are loaded.
+    Asset: func(name string) ([]byte, error) { // Load from an Asset function instead of file.
+      return []byte("template content"), nil
+    },
+    AssetNames: func() []string { // Return a list of asset names for the Asset function
+      return []string{"filename.tmpl"}
+    },
+    Layout: "layout", // Specify a layout template. Layouts can call {{ yield }} to render the current template or {{ partial "css" }} to render a partial from the current template.
+    Extensions: []string{".tmpl", ".html"}, // Specify extensions to load for templates.
+    Funcs: []template.FuncMap{AppHelpers}, // Specify helper function maps for templates to access.
+    Delims: render.Delims{"{[{", "}]}"}, // Sets delimiters to the specified strings.
+    Charset: "UTF-8", // Sets encoding for content-types. Default is "UTF-8".
+    DisableCharset: true, // Prevents the charset from being appended to the content type header.
+    IndentJSON: true, // Output human readable JSON.
+    IndentXML: true, // Output human readable XML.
+    PrefixJSON: []byte(")]}',\n"), // Prefixes JSON responses with the given bytes.
+    PrefixXML: []byte("<?xml version='1.0' encoding='UTF-8'?>"), // Prefixes XML responses with the given bytes.
+    HTMLContentType: "application/xhtml+xml", // Output XHTML content type instead of default "text/html".
+    IsDevelopment: true, // Render will now recompile the templates on every HTML response.
+    UnEscapeHTML: true, // Replace ensure '&<>' are output correctly (JSON only).
+    StreamingJSON: true, // Streams the JSON response via json.Encoder.
+    RequirePartials: true, // Return an error if a template is missing a partial used in a layout.
+    DisableHTTPErrorRendering: true, // Disables automatic rendering of http.StatusInternalServerError when an error occurs.
+})
+// ...
+~~~
+
+### Default Options
+These are the preset options for Render:
+
+~~~ go
+r := render.New()
+
+// Is the same as the default configuration options:
+
+r := render.New(render.Options{
+    Directory: "templates",
+    FileSystem: &LocalFileSystem{},
+    Asset: nil,
+    AssetNames: nil,
+    Layout: "",
+    Extensions: []string{".tmpl"},
+    Funcs: []template.FuncMap{},
+    Delims: render.Delims{"{{", "}}"},
+    Charset: "UTF-8",
+    DisableCharset: false,
+    IndentJSON: false,
+    IndentXML: false,
+    PrefixJSON: []byte(""),
+    PrefixXML: []byte(""),
+    BinaryContentType: "application/octet-stream",
+    HTMLContentType: "text/html",
+    JSONContentType: "application/json",
+    JSONPContentType: "application/javascript",
+    TextContentType: "text/plain",
+    XMLContentType: "application/xhtml+xml",
+    IsDevelopment: false,
+    UnEscapeHTML: false,
+    StreamingJSON: false,
+    RequirePartials: false,
+    DisableHTTPErrorRendering: false,
+})
+~~~
+
+### JSON vs Streaming JSON
+By default, Render does **not** stream JSON to the `http.ResponseWriter`. It instead marshalls your object into a byte array, and if no errors occurred, writes that byte array to the `http.ResponseWriter`. If you would like to use the built it in streaming functionality (`json.Encoder`), you can set the `StreamingJSON` setting to `true`. This will stream the output directly to the `http.ResponseWriter`. Also note that streaming is only implemented in `render.JSON` and not `render.JSONP`, and the `UnEscapeHTML` and `Indent` options are ignored when streaming.
+
+### Loading Templates
+By default Render will attempt to load templates with a '.tmpl' extension from the "templates" directory. Templates are found by traversing the templates directory and are named by path and basename. For instance, the following directory structure:
+
+~~~
+templates/
+  |
+  |__ admin/
+  |      |
+  |      |__ index.tmpl
+  |      |
+  |      |__ edit.tmpl
+  |
+  |__ home.tmpl
+~~~
+
+Will provide the following templates:
+~~~
+admin/index
+admin/edit
+home
+~~~
+
+You can also load templates from memory by providing the Asset and AssetNames options,
+e.g. when generating an asset file using [go-bindata](https://github.com/jteeuwen/go-bindata).
+
+### Layouts
+Render provides `yield` and `partial` functions for layouts to access:
+~~~ go
+// ...
+r := render.New(render.Options{
+    Layout: "layout",
+})
+// ...
+~~~
+
+~~~ html
+<!-- templates/layout.tmpl -->
+<html>
+  <head>
+    <title>My Layout</title>
+    <!-- Render the partial template called `css-$current_template` here -->
+    {{ partial "css" }}
+  </head>
+  <body>
+    <!-- render the partial template called `header-$current_template` here -->
+    {{ partial "header" }}
+    <!-- Render the current template here -->
+    {{ yield }}
+    <!-- render the partial template called `footer-$current_template` here -->
+    {{ partial "footer" }}
+  </body>
+</html>
+~~~
+
+`current` can also be called to get the current template being rendered.
+~~~ html
+<!-- templates/layout.tmpl -->
+<html>
+  <head>
+    <title>My Layout</title>
+  </head>
+  <body>
+    This is the {{ current }} page.
+  </body>
+</html>
+~~~
+
+Partials are defined by individual templates as seen below. The partial template's
+name needs to be defined as "{partial name}-{template name}".
+~~~ html
+<!-- templates/home.tmpl -->
+{{ define "header-home" }}
+<h1>Home</h1>
+{{ end }}
+
+{{ define "footer-home"}}
+<p>The End</p>
+{{ end }}
+~~~
+
+By default, the template is not required to define all partials referenced in the
+layout. If you want an error to be returned when a template does not define a
+partial, set `Options.RequirePartials = true`.
+
+### Character Encodings
+Render will automatically set the proper Content-Type header based on which function you call. See below for an example of what the default settings would output (note that UTF-8 is the default, and binary data does not output the charset):
+~~~ go
+// main.go
+package main
+
+import (
+    "encoding/xml"
+    "net/http"
+
+    "github.com/unrolled/render"  // or "gopkg.in/unrolled/render.v1"
+)
+
+type ExampleXml struct {
+    XMLName xml.Name `xml:"example"`
+    One     string   `xml:"one,attr"`
+    Two     string   `xml:"two,attr"`
+}
+
+func main() {
+    r := render.New(render.Options{})
+    mux := http.NewServeMux()
+
+    // This will set the Content-Type header to "application/octet-stream".
+    // Note that this does not receive a charset value.
+    mux.HandleFunc("/data", func(w http.ResponseWriter, req *http.Request) {
+        r.Data(w, http.StatusOK, []byte("Some binary data here."))
+    })
+
+    // This will set the Content-Type header to "application/json; charset=UTF-8".
+    mux.HandleFunc("/json", func(w http.ResponseWriter, req *http.Request) {
+        r.JSON(w, http.StatusOK, map[string]string{"hello": "json"})
+    })
+
+    // This will set the Content-Type header to "text/xml; charset=UTF-8".
+    mux.HandleFunc("/xml", func(w http.ResponseWriter, req *http.Request) {
+        r.XML(w, http.StatusOK, ExampleXml{One: "hello", Two: "xml"})
+    })
+
+    // This will set the Content-Type header to "text/plain; charset=UTF-8".
+    mux.HandleFunc("/text", func(w http.ResponseWriter, req *http.Request) {
+        r.Text(w, http.StatusOK, "Plain text here")
+    })
+
+    // This will set the Content-Type header to "text/html; charset=UTF-8".
+    mux.HandleFunc("/html", func(w http.ResponseWriter, req *http.Request) {
+        // Assumes you have a template in ./templates called "example.tmpl"
+        // $ mkdir -p templates && echo "<h1>Hello {{.}}.</h1>" > templates/example.tmpl
+        r.HTML(w, http.StatusOK, "example", "World")
+    })
+
+    http.ListenAndServe("127.0.0.1:3000", mux)
+}
+~~~
+
+In order to change the charset, you can set the `Charset` within the `render.Options` to your encoding value:
+~~~ go
+// main.go
+package main
+
+import (
+    "encoding/xml"
+    "net/http"
+
+    "github.com/unrolled/render"  // or "gopkg.in/unrolled/render.v1"
+)
+
+type ExampleXml struct {
+    XMLName xml.Name `xml:"example"`
+    One     string   `xml:"one,attr"`
+    Two     string   `xml:"two,attr"`
+}
+
+func main() {
+    r := render.New(render.Options{
+        Charset: "ISO-8859-1",
+    })
+    mux := http.NewServeMux()
+
+    // This will set the Content-Type header to "application/octet-stream".
+    // Note that this does not receive a charset value.
+    mux.HandleFunc("/data", func(w http.ResponseWriter, req *http.Request) {
+        r.Data(w, http.StatusOK, []byte("Some binary data here."))
+    })
+
+    // This will set the Content-Type header to "application/json; charset=ISO-8859-1".
+    mux.HandleFunc("/json", func(w http.ResponseWriter, req *http.Request) {
+        r.JSON(w, http.StatusOK, map[string]string{"hello": "json"})
+    })
+
+    // This will set the Content-Type header to "text/xml; charset=ISO-8859-1".
+    mux.HandleFunc("/xml", func(w http.ResponseWriter, req *http.Request) {
+        r.XML(w, http.StatusOK, ExampleXml{One: "hello", Two: "xml"})
+    })
+
+    // This will set the Content-Type header to "text/plain; charset=ISO-8859-1".
+    mux.HandleFunc("/text", func(w http.ResponseWriter, req *http.Request) {
+        r.Text(w, http.StatusOK, "Plain text here")
+    })
+
+    // This will set the Content-Type header to "text/html; charset=ISO-8859-1".
+    mux.HandleFunc("/html", func(w http.ResponseWriter, req *http.Request) {
+        // Assumes you have a template in ./templates called "example.tmpl"
+        // $ mkdir -p templates && echo "<h1>Hello {{.}}.</h1>" > templates/example.tmpl
+        r.HTML(w, http.StatusOK, "example", "World")
+    })
+
+    http.ListenAndServe("127.0.0.1:3000", mux)
+}
+~~~
+
+### Error Handling
+
+The rendering functions return any errors from the rendering engine.
+By default, they will also write the error to the HTTP response and set the status code to 500. You can disable
+this behavior so that you can handle errors yourself by setting
+`Options.DisableHTTPErrorRendering: true`.
+
+~~~go
+r := render.New(render.Options{
+  DisableHTTPErrorRendering: true,
+})
+
+//...
+
+err := r.HTML(w, http.StatusOK, "example", "World")
+if err != nil{
+  http.Redirect(w, r, "/my-custom-500", http.StatusFound)
+}
+~~~
+
+## Integration Examples
+
+### [Echo](https://github.com/labstack/echo)
+~~~ go
+// main.go
+package main
+
+import (
+    "io"
+    "net/http"
+
+    "github.com/labstack/echo"
+    "github.com/unrolled/render"  // or "gopkg.in/unrolled/render.v1"
+)
+
+type RenderWrapper struct { // We need to wrap the renderer because we need a different signature for echo.
+    rnd *render.Render
+}
+
+func (r *RenderWrapper) Render(w io.Writer, name string, data interface{},c echo.Context) error {
+    return r.rnd.HTML(w, 0, name, data) // The zero status code is overwritten by echo.
+}
+
+func main() {
+    r := &RenderWrapper{render.New()}
+
+    e := echo.New()
+
+    e.Renderer = r
+
+    e.GET("/", func(c echo.Context) error {
+        return c.Render(http.StatusOK, "TemplateName", "TemplateData")
+    })
+
+    e.Logger.Fatal(e.Start(":1323"))
+}
+~~~
+
+### [Gin](https://github.com/gin-gonic/gin)
+~~~ go
+// main.go
+package main
+
+import (
+    "net/http"
+
+    "github.com/gin-gonic/gin"
+    "github.com/unrolled/render"  // or "gopkg.in/unrolled/render.v1"
+)
+
+func main() {
+    r := render.New(render.Options{
+        IndentJSON: true,
+    })
+
+    router := gin.Default()
+
+    router.GET("/", func(c *gin.Context) {
+        r.JSON(c.Writer, http.StatusOK, map[string]string{"welcome": "This is rendered JSON!"})
+    })
+
+    router.Run(":3000")
+}
+~~~
+
+### [Goji](https://github.com/zenazn/goji)
+~~~ go
+// main.go
+package main
+
+import (
+    "net/http"
+
+    "github.com/zenazn/goji"
+    "github.com/zenazn/goji/web"
+    "github.com/unrolled/render"  // or "gopkg.in/unrolled/render.v1"
+)
+
+func main() {
+    r := render.New(render.Options{
+        IndentJSON: true,
+    })
+
+    goji.Get("/", func(c web.C, w http.ResponseWriter, req *http.Request) {
+        r.JSON(w, http.StatusOK, map[string]string{"welcome": "This is rendered JSON!"})
+    })
+    goji.Serve()  // Defaults to ":8000".
+}
+~~~
+
+### [Negroni](https://github.com/codegangsta/negroni)
+~~~ go
+// main.go
+package main
+
+import (
+    "net/http"
+
+    "github.com/urfave/negroni"
+    "github.com/unrolled/render"  // or "gopkg.in/unrolled/render.v1"
+)
+
+func main() {
+    r := render.New(render.Options{
+        IndentJSON: true,
+    })
+    mux := http.NewServeMux()
+
+    mux.HandleFunc("/", func(w http.ResponseWriter, req *http.Request) {
+        r.JSON(w, http.StatusOK, map[string]string{"welcome": "This is rendered JSON!"})
+    })
+
+    n := negroni.Classic()
+    n.UseHandler(mux)
+    n.Run(":3000")
+}
+~~~
+
+### [Traffic](https://github.com/pilu/traffic)
+~~~ go
+// main.go
+package main
+
+import (
+    "net/http"
+
+    "github.com/pilu/traffic"
+    "github.com/unrolled/render"  // or "gopkg.in/unrolled/render.v1"
+)
+
+func main() {
+    r := render.New(render.Options{
+        IndentJSON: true,
+    })
+
+    router := traffic.New()
+    router.Get("/", func(w traffic.ResponseWriter, req *traffic.Request) {
+        r.JSON(w, http.StatusOK, map[string]string{"welcome": "This is rendered JSON!"})
+    })
+
+    router.Run()
+}
+~~~

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

@@ -0,0 +1,46 @@
+package render
+
+import "bytes"
+
+// bufPool represents a reusable buffer pool for executing templates into.
+var bufPool *BufferPool
+
+// BufferPool implements a pool of bytes.Buffers in the form of a bounded channel.
+// Pulled from the github.com/oxtoacart/bpool package (Apache licensed).
+type BufferPool struct {
+	c chan *bytes.Buffer
+}
+
+// NewBufferPool creates a new BufferPool bounded to the given size.
+func NewBufferPool(size int) (bp *BufferPool) {
+	return &BufferPool{
+		c: make(chan *bytes.Buffer, size),
+	}
+}
+
+// Get gets a Buffer from the BufferPool, or creates a new one if none are
+// available in the pool.
+func (bp *BufferPool) Get() (b *bytes.Buffer) {
+	select {
+	case b = <-bp.c:
+	// reuse existing buffer
+	default:
+		// create new buffer
+		b = bytes.NewBuffer([]byte{})
+	}
+	return
+}
+
+// Put returns the given Buffer to the BufferPool.
+func (bp *BufferPool) Put(b *bytes.Buffer) {
+	b.Reset()
+	select {
+	case bp.c <- b:
+	default: // Discard the buffer if the pool is full.
+	}
+}
+
+// Initialize buffer pool for writing templates into.
+func init() {
+	bufPool = NewBufferPool(64)
+}

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

@@ -0,0 +1,55 @@
+/*Package render is a package that provides functionality for easily rendering JSON, XML, binary data, and HTML templates.
+
+  package main
+
+  import (
+      "encoding/xml"
+      "net/http"
+
+      "github.com/unrolled/render"  // or "gopkg.in/unrolled/render.v1"
+  )
+
+  type ExampleXml struct {
+      XMLName xml.Name `xml:"example"`
+      One     string   `xml:"one,attr"`
+      Two     string   `xml:"two,attr"`
+  }
+
+  func main() {
+      r := render.New()
+      mux := http.NewServeMux()
+
+      mux.HandleFunc("/", func(w http.ResponseWriter, req *http.Request) {
+          w.Write([]byte("Welcome, visit sub pages now."))
+      })
+
+      mux.HandleFunc("/data", func(w http.ResponseWriter, req *http.Request) {
+          r.Data(w, http.StatusOK, []byte("Some binary data here."))
+      })
+
+      mux.HandleFunc("/text", func(w http.ResponseWriter, req *http.Request) {
+          r.Text(w, http.StatusOK, "Plain text here")
+      })
+
+      mux.HandleFunc("/json", func(w http.ResponseWriter, req *http.Request) {
+          r.JSON(w, http.StatusOK, map[string]string{"hello": "json"})
+      })
+
+      mux.HandleFunc("/jsonp", func(w http.ResponseWriter, req *http.Request) {
+          r.JSONP(w, http.StatusOK, "callbackName", map[string]string{"hello": "jsonp"})
+      })
+
+      mux.HandleFunc("/xml", func(w http.ResponseWriter, req *http.Request) {
+          r.XML(w, http.StatusOK, ExampleXml{One: "hello", Two: "xml"})
+      })
+
+      mux.HandleFunc("/html", func(w http.ResponseWriter, req *http.Request) {
+          // Assumes you have a template in ./templates called "example.tmpl".
+          // $ mkdir -p templates && echo "<h1>Hello HTML world.</h1>" > templates/example.tmpl
+          r.HTML(w, http.StatusOK, "example", nil)
+      })
+
+      http.ListenAndServe("0.0.0.0:3000", mux)
+  }
+*/
+package render

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
+}

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

@@ -0,0 +1,21 @@
+package render
+
+import (
+	"io/ioutil"
+	"path/filepath"
+)
+
+type FileSystem interface {
+	Walk(root string, walkFn filepath.WalkFunc) error
+	ReadFile(filename string) ([]byte, error)
+}
+
+type LocalFileSystem struct{}
+
+func (LocalFileSystem) Walk(root string, walkFn filepath.WalkFunc) error {
+	return filepath.Walk(root, walkFn)
+}
+
+func (LocalFileSystem) ReadFile(filename string) ([]byte, error) {
+	return ioutil.ReadFile(filename)
+}

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

@@ -0,0 +1,5 @@
+module github.com/unrolled/render
+
+go 1.12
+
+require github.com/eknkc/amber v0.0.0-20171010120322-cdade1c07385

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

@@ -0,0 +1,2 @@
+github.com/eknkc/amber v0.0.0-20171010120322-cdade1c07385 h1:clC1lXBpe2kTj2VHdaIu9ajZQe4kcEY9j0NsnDDBZ3o=
+github.com/eknkc/amber v0.0.0-20171010120322-cdade1c07385/go.mod h1:0vRUJqYpeSZifjYj7uP3BG/gKcuzL9xWVV/Y+cK33KM=

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

@@ -0,0 +1,21 @@
+// +build go1.6
+
+package render
+
+import (
+	"fmt"
+	"html/template"
+)
+
+// Included helper functions for use when rendering HTML.
+var helperFuncs = template.FuncMap{
+	"yield": func() (string, error) {
+		return "", fmt.Errorf("yield called with no layout defined")
+	},
+	"partial": func() (string, error) {
+		return "", fmt.Errorf("block called with no layout defined")
+	},
+	"current": func() (string, error) {
+		return "", nil
+	},
+}

vendor/github.com/unrolled/render/helpers_pre16.go

@@ -0,0 +1,26 @@
+// +build !go1.6
+
+package render
+
+import (
+	"fmt"
+	"html/template"
+)
+
+// Included helper functions for use when rendering HTML.
+var helperFuncs = template.FuncMap{
+	"yield": func() (string, error) {
+		return "", fmt.Errorf("yield called with no layout defined")
+	},
+	// `block` is deprecated! Use the `partial` below if you need this functionality still.
+	// Otherwise, checkout Go's `block` implementation introduced in 1.6
+	"block": func() (string, error) {
+		return "", fmt.Errorf("block called with no layout defined")
+	},
+	"partial": func() (string, error) {
+		return "", fmt.Errorf("block called with no layout defined")
+	},
+	"current": func() (string, error) {
+		return "", nil
+	},
+}

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

@@ -0,0 +1,480 @@
+package render
+
+import (
+	"bytes"
+	"fmt"
+	"html/template"
+	"io"
+	"log"
+	"net/http"
+	"os"
+	"path/filepath"
+	"strings"
+	"sync"
+)
+
+const (
+	// ContentBinary header value for binary data.
+	ContentBinary = "application/octet-stream"
+	// ContentHTML header value for HTML data.
+	ContentHTML = "text/html"
+	// ContentJSON header value for JSON data.
+	ContentJSON = "application/json"
+	// ContentJSONP header value for JSONP data.
+	ContentJSONP = "application/javascript"
+	// ContentLength header constant.
+	ContentLength = "Content-Length"
+	// ContentText header value for Text data.
+	ContentText = "text/plain"
+	// ContentType header constant.
+	ContentType = "Content-Type"
+	// ContentXHTML header value for XHTML data.
+	ContentXHTML = "application/xhtml+xml"
+	// ContentXML header value for XML data.
+	ContentXML = "text/xml"
+	// Default character encoding.
+	defaultCharset = "UTF-8"
+)
+
+// helperFuncs had to be moved out. See helpers.go|helpers_pre16.go files.
+
+// Delims represents a set of Left and Right delimiters for HTML template rendering.
+type Delims struct {
+	// Left delimiter, defaults to {{.
+	Left string
+	// Right delimiter, defaults to }}.
+	Right string
+}
+
+// Options is a struct for specifying configuration options for the render.Render object.
+type Options struct {
+	// Directory to load templates. Default is "templates".
+	Directory string
+	// FileSystem to access files
+	FileSystem FileSystem
+	// Asset function to use in place of directory. Defaults to nil.
+	Asset func(name string) ([]byte, error)
+	// AssetNames function to use in place of directory. Defaults to nil.
+	AssetNames func() []string
+	// Layout template name. Will not render a layout if blank (""). Defaults to blank ("").
+	Layout string
+	// Extensions to parse template files from. Defaults to [".tmpl"].
+	Extensions []string
+	// Funcs is a slice of FuncMaps to apply to the template upon compilation. This is useful for helper functions. Defaults to empty map.
+	Funcs []template.FuncMap
+	// Delims sets the action delimiters to the specified strings in the Delims struct.
+	Delims Delims
+	// Appends the given character set to the Content-Type header. Default is "UTF-8".
+	Charset string
+	// If DisableCharset is set to true, it will not append the above Charset value to the Content-Type header. Default is false.
+	DisableCharset bool
+	// Outputs human readable JSON.
+	IndentJSON bool
+	// Outputs human readable XML. Default is false.
+	IndentXML bool
+	// Prefixes the JSON output with the given bytes. Default is false.
+	PrefixJSON []byte
+	// Prefixes the XML output with the given bytes.
+	PrefixXML []byte
+	// Allows changing the binary content type.
+	BinaryContentType string
+	// Allows changing the HTML content type.
+	HTMLContentType string
+	// Allows changing the JSON content type.
+	JSONContentType string
+	// Allows changing the JSONP content type.
+	JSONPContentType string
+	// Allows changing the Text content type.
+	TextContentType string
+	// Allows changing the XML content type.
+	XMLContentType string
+	// If IsDevelopment is set to true, this will recompile the templates on every request. Default is false.
+	IsDevelopment bool
+	// Unescape HTML characters "&<>" to their original values. Default is false.
+	UnEscapeHTML bool
+	// Streams JSON responses instead of marshalling prior to sending. Default is false.
+	StreamingJSON bool
+	// Require that all partials executed in the layout are implemented in all templates using the layout. Default is false.
+	RequirePartials bool
+	// Deprecated: Use the above `RequirePartials` instead of this. As of Go 1.6, blocks are built in. Default is false.
+	RequireBlocks bool
+	// Disables automatic rendering of http.StatusInternalServerError when an error occurs. Default is false.
+	DisableHTTPErrorRendering bool
+	// Enables using partials without the current filename suffix which allows use of the same template in multiple files. e.g {{ partial "carosuel" }} inside the home template will match carosel-home or carosel.
+	// ***NOTE*** - This option should be named RenderPartialsWithoutSuffix as that is what it does. "Prefix" is a typo. Maintaining the existing name for backwards compatibility.
+	RenderPartialsWithoutPrefix bool
+}
+
+// HTMLOptions is a struct for overriding some rendering Options for specific HTML call.
+type HTMLOptions struct {
+	// Layout template name. Overrides Options.Layout.
+	Layout string
+	// Funcs added to Options.Funcs.
+	Funcs template.FuncMap
+}
+
+// Render is a service that provides functions for easily writing JSON, XML,
+// binary data, and HTML templates out to a HTTP Response.
+type Render struct {
+	// Customize Secure with an Options struct.
+	opt             Options
+	templates       *template.Template
+	templatesLk     sync.Mutex
+	compiledCharset string
+}
+
+// New constructs a new Render instance with the supplied options.
+func New(options ...Options) *Render {
+	var o Options
+	if len(options) > 0 {
+		o = options[0]
+	}
+
+	r := Render{
+		opt: o,
+	}
+
+	r.prepareOptions()
+	r.compileTemplates()
+
+	return &r
+}
+
+func (r *Render) prepareOptions() {
+	// Fill in the defaults if need be.
+	if len(r.opt.Charset) == 0 {
+		r.opt.Charset = defaultCharset
+	}
+	if r.opt.DisableCharset == false {
+		r.compiledCharset = "; charset=" + r.opt.Charset
+	}
+
+	if len(r.opt.Directory) == 0 {
+		r.opt.Directory = "templates"
+	}
+	if r.opt.FileSystem == nil {
+		r.opt.FileSystem = &LocalFileSystem{}
+	}
+	if len(r.opt.Extensions) == 0 {
+		r.opt.Extensions = []string{".tmpl"}
+	}
+	if len(r.opt.BinaryContentType) == 0 {
+		r.opt.BinaryContentType = ContentBinary
+	}
+	if len(r.opt.HTMLContentType) == 0 {
+		r.opt.HTMLContentType = ContentHTML
+	}
+	if len(r.opt.JSONContentType) == 0 {
+		r.opt.JSONContentType = ContentJSON
+	}
+	if len(r.opt.JSONPContentType) == 0 {
+		r.opt.JSONPContentType = ContentJSONP
+	}
+	if len(r.opt.TextContentType) == 0 {
+		r.opt.TextContentType = ContentText
+	}
+	if len(r.opt.XMLContentType) == 0 {
+		r.opt.XMLContentType = ContentXML
+	}
+}
+
+func (r *Render) compileTemplates() {
+	if r.opt.Asset == nil || r.opt.AssetNames == nil {
+		r.compileTemplatesFromDir()
+		return
+	}
+	r.compileTemplatesFromAsset()
+}
+
+func (r *Render) compileTemplatesFromDir() {
+	dir := r.opt.Directory
+	r.templates = template.New(dir)
+	r.templates.Delims(r.opt.Delims.Left, r.opt.Delims.Right)
+
+	// Walk the supplied directory and compile any files that match our extension list.
+	r.opt.FileSystem.Walk(dir, func(path string, info os.FileInfo, err error) error {
+		// Fix same-extension-dirs bug: some dir might be named to: "users.tmpl", "local.html".
+		// These dirs should be excluded as they are not valid golang templates, but files under
+		// them should be treat as normal.
+		// If is a dir, return immediately (dir is not a valid golang template).
+		if info == nil || info.IsDir() {
+			return nil
+		}
+
+		rel, err := filepath.Rel(dir, path)
+		if err != nil {
+			return err
+		}
+
+		ext := ""
+		if strings.Index(rel, ".") != -1 {
+			ext = filepath.Ext(rel)
+		}
+
+		for _, extension := range r.opt.Extensions {
+			if ext == extension {
+				buf, err := r.opt.FileSystem.ReadFile(path)
+				if err != nil {
+					panic(err)
+				}
+
+				name := (rel[0 : len(rel)-len(ext)])
+				tmpl := r.templates.New(filepath.ToSlash(name))
+
+				// Add our funcmaps.
+				for _, funcs := range r.opt.Funcs {
+					tmpl.Funcs(funcs)
+				}
+
+				// Break out if this parsing fails. We don't want any silent server starts.
+				template.Must(tmpl.Funcs(helperFuncs).Parse(string(buf)))
+				break
+			}
+		}
+		return nil
+	})
+}
+
+func (r *Render) compileTemplatesFromAsset() {
+	dir := r.opt.Directory
+	r.templates = template.New(dir)
+	r.templates.Delims(r.opt.Delims.Left, r.opt.Delims.Right)
+
+	for _, path := range r.opt.AssetNames() {
+		if !strings.HasPrefix(path, dir) {
+			continue
+		}
+
+		rel, err := filepath.Rel(dir, path)
+		if err != nil {
+			panic(err)
+		}
+
+		ext := ""
+		if strings.Index(rel, ".") != -1 {
+			ext = "." + strings.Join(strings.Split(rel, ".")[1:], ".")
+		}
+
+		for _, extension := range r.opt.Extensions {
+			if ext == extension {
+
+				buf, err := r.opt.Asset(path)
+				if err != nil {
+					panic(err)
+				}
+
+				name := (rel[0 : len(rel)-len(ext)])
+				tmpl := r.templates.New(filepath.ToSlash(name))
+
+				// Add our funcmaps.
+				for _, funcs := range r.opt.Funcs {
+					tmpl.Funcs(funcs)
+				}
+
+				// Break out if this parsing fails. We don't want any silent server starts.
+				template.Must(tmpl.Funcs(helperFuncs).Parse(string(buf)))
+				break
+			}
+		}
+	}
+}
+
+// TemplateLookup is a wrapper around template.Lookup and returns
+// the template with the given name that is associated with t, or nil
+// if there is no such template.
+func (r *Render) TemplateLookup(t string) *template.Template {
+	return r.templates.Lookup(t)
+}
+
+func (r *Render) execute(name string, binding interface{}) (*bytes.Buffer, error) {
+	buf := new(bytes.Buffer)
+	return buf, r.templates.ExecuteTemplate(buf, name, binding)
+}
+
+func (r *Render) layoutFuncs(name string, binding interface{}) template.FuncMap {
+	return template.FuncMap{
+		"yield": func() (template.HTML, error) {
+			buf, err := r.execute(name, binding)
+			// Return safe HTML here since we are rendering our own template.
+			return template.HTML(buf.String()), err
+		},
+		"current": func() (string, error) {
+			return name, nil
+		},
+		"block": func(partialName string) (template.HTML, error) {
+			log.Print("Render's `block` implementation is now depericated. Use `partial` as a drop in replacement.")
+			fullPartialName := fmt.Sprintf("%s-%s", partialName, name)
+			if r.TemplateLookup(fullPartialName) == nil && r.opt.RenderPartialsWithoutPrefix {
+				fullPartialName = partialName
+			}
+			if r.opt.RequireBlocks || r.TemplateLookup(fullPartialName) != nil {
+				buf, err := r.execute(fullPartialName, binding)
+				// Return safe HTML here since we are rendering our own template.
+				return template.HTML(buf.String()), err
+			}
+			return "", nil
+		},
+		"partial": func(partialName string) (template.HTML, error) {
+			fullPartialName := fmt.Sprintf("%s-%s", partialName, name)
+			if r.TemplateLookup(fullPartialName) == nil && r.opt.RenderPartialsWithoutPrefix {
+				fullPartialName = partialName
+			}
+			if r.opt.RequirePartials || r.TemplateLookup(fullPartialName) != nil {
+				buf, err := r.execute(fullPartialName, binding)
+				// Return safe HTML here since we are rendering our own template.
+				return template.HTML(buf.String()), err
+			}
+			return "", nil
+		},
+	}
+}
+
+func (r *Render) prepareHTMLOptions(htmlOpt []HTMLOptions) HTMLOptions {
+	layout := r.opt.Layout
+	funcs := template.FuncMap{}
+
+	for _, tmp := range r.opt.Funcs {
+		for k, v := range tmp {
+			funcs[k] = v
+		}
+	}
+
+	if len(htmlOpt) > 0 {
+		opt := htmlOpt[0]
+		if len(opt.Layout) > 0 {
+			layout = opt.Layout
+		}
+
+		for k, v := range opt.Funcs {
+			funcs[k] = v
+		}
+	}
+
+	return HTMLOptions{
+		Layout: layout,
+		Funcs:  funcs,
+	}
+}
+
+// Render is the generic function called by XML, JSON, Data, HTML, and can be called by custom implementations.
+func (r *Render) Render(w io.Writer, e Engine, data interface{}) error {
+	err := e.Render(w, data)
+	if hw, ok := w.(http.ResponseWriter); err != nil && !r.opt.DisableHTTPErrorRendering && ok {
+		http.Error(hw, err.Error(), http.StatusInternalServerError)
+	}
+	return err
+}
+
+// Data writes out the raw bytes as binary data.
+func (r *Render) Data(w io.Writer, status int, v []byte) error {
+	head := Head{
+		ContentType: r.opt.BinaryContentType,
+		Status:      status,
+	}
+
+	d := Data{
+		Head: head,
+	}
+
+	return r.Render(w, d, v)
+}
+
+// HTML builds up the response from the specified template and bindings.
+func (r *Render) HTML(w io.Writer, status int, name string, binding interface{}, htmlOpt ...HTMLOptions) error {
+	r.templatesLk.Lock()
+	defer r.templatesLk.Unlock()
+
+	// If we are in development mode, recompile the templates on every HTML request.
+	if r.opt.IsDevelopment {
+		r.compileTemplates()
+	}
+
+	opt := r.prepareHTMLOptions(htmlOpt)
+	if tpl := r.templates.Lookup(name); tpl != nil {
+		if len(opt.Layout) > 0 {
+			tpl.Funcs(r.layoutFuncs(name, binding))
+			name = opt.Layout
+		}
+
+		if len(opt.Funcs) > 0 {
+			tpl.Funcs(opt.Funcs)
+		}
+	}
+
+	head := Head{
+		ContentType: r.opt.HTMLContentType + r.compiledCharset,
+		Status:      status,
+	}
+
+	h := HTML{
+		Head:      head,
+		Name:      name,
+		Templates: r.templates,
+	}
+
+	return r.Render(w, h, binding)
+}
+
+// JSON marshals the given interface object and writes the JSON response.
+func (r *Render) JSON(w io.Writer, status int, v interface{}) error {
+	head := Head{
+		ContentType: r.opt.JSONContentType + r.compiledCharset,
+		Status:      status,
+	}
+
+	j := JSON{
+		Head:          head,
+		Indent:        r.opt.IndentJSON,
+		Prefix:        r.opt.PrefixJSON,
+		UnEscapeHTML:  r.opt.UnEscapeHTML,
+		StreamingJSON: r.opt.StreamingJSON,
+	}
+
+	return r.Render(w, j, v)
+}
+
+// JSONP marshals the given interface object and writes the JSON response.
+func (r *Render) JSONP(w io.Writer, status int, callback string, v interface{}) error {
+	head := Head{
+		ContentType: r.opt.JSONPContentType + r.compiledCharset,
+		Status:      status,
+	}
+
+	j := JSONP{
+		Head:     head,
+		Indent:   r.opt.IndentJSON,
+		Callback: callback,
+	}
+
+	return r.Render(w, j, v)
+}
+
+// Text writes out a string as plain text.
+func (r *Render) Text(w io.Writer, status int, v string) error {
+	head := Head{
+		ContentType: r.opt.TextContentType + r.compiledCharset,
+		Status:      status,
+	}
+
+	t := Text{
+		Head: head,
+	}
+
+	return r.Render(w, t, v)
+}
+
+// XML marshals the given interface object and writes the XML response.
+func (r *Render) XML(w io.Writer, status int, v interface{}) error {
+	head := Head{
+		ContentType: r.opt.XMLContentType + r.compiledCharset,
+		Status:      status,
+	}
+
+	x := XML{
+		Head:   head,
+		Indent: r.opt.IndentXML,
+		Prefix: r.opt.PrefixXML,
+	}
+
+	return r.Render(w, x, v)
+}