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errors.go
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/
errors.go
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package buffalo
import (
"encoding/json"
"fmt"
"net/http"
"sort"
"strings"
"github.com/gobuffalo/plush"
"github.com/gobuffalo/x/httpx"
"github.com/pkg/errors"
)
// HTTPError a typed error returned by http Handlers and used for choosing error handlers
type HTTPError struct {
Status int `json:"status"`
Cause error `json:"error"`
}
func (h HTTPError) Error() string {
return h.Cause.Error()
}
// ErrorHandler interface for handling an error for a
// specific status code.
type ErrorHandler func(int, error, Context) error
// ErrorHandlers is used to hold a list of ErrorHandler
// types that can be used to handle specific status codes.
/*
a.ErrorHandlers[500] = func(status int, err error, c buffalo.Context) error {
res := c.Response()
res.WriteHeader(status)
res.Write([]byte(err.Error()))
return nil
}
*/
type ErrorHandlers map[int]ErrorHandler
// Get a registered ErrorHandler for this status code. If
// no ErrorHandler has been registered, a default one will
// be returned.
func (e ErrorHandlers) Get(status int) ErrorHandler {
if eh, ok := e[status]; ok {
return eh
}
return defaultErrorHandler
}
// PanicHandler recovers from panics gracefully and calls
// the error handling code for a 500 error.
func (a *App) PanicHandler(next Handler) Handler {
return func(c Context) error {
defer func() { //catch or finally
r := recover()
var err error
if r != nil { //catch
switch t := r.(type) {
case error:
err = errors.WithStack(t)
case string:
err = errors.WithStack(errors.New(t))
default:
err = errors.New(fmt.Sprint(t))
}
eh := a.ErrorHandlers.Get(500)
eh(500, err, c)
}
}()
return next(c)
}
}
func defaultErrorHandler(status int, err error, c Context) error {
env := c.Value("env")
c.Logger().Error(err)
if env != nil && env.(string) == "production" {
c.Response().WriteHeader(status)
c.Response().Write([]byte(prodErrorTmpl))
return nil
}
c.Response().WriteHeader(status)
msg := fmt.Sprintf("%+v", err)
ct := httpx.ContentType(c.Request())
switch strings.ToLower(ct) {
case "application/json", "text/json", "json":
err = json.NewEncoder(c.Response()).Encode(map[string]interface{}{
"error": msg,
"code": status,
})
case "application/xml", "text/xml", "xml":
default:
err := c.Request().ParseForm()
routes := c.Value("routes")
if cd, ok := c.(*DefaultContext); ok {
delete(cd.data, "app")
delete(cd.data, "routes")
}
data := map[string]interface{}{
"routes": routes,
"error": msg,
"status": status,
"data": c.Data(),
"params": c.Params(),
"posted_form": c.Request().Form,
"context": c,
"headers": inspectHeaders(c.Request().Header),
"inspect": func(v interface{}) string {
return fmt.Sprintf("%+v", v)
},
}
ctx := plush.NewContextWith(data)
t, err := plush.Render(devErrorTmpl, ctx)
if err != nil {
return errors.WithStack(err)
}
res := c.Response()
_, err = res.Write([]byte(t))
return err
}
return err
}
type inspectHeaders http.Header
func (i inspectHeaders) String() string {
bb := make([]string, 0, len(i))
for k, v := range i {
bb = append(bb, fmt.Sprintf("%s: %s", k, v))
}
sort.Strings(bb)
return strings.Join(bb, "\n\n")
}
var devErrorTmpl = `
<html>
<head>
<title><%= status %> - ERROR!</title>
<style>html{font-family:sans-serif;-webkit-text-size-adjust:100%;-ms-text-size-adjust:100%}body{margin:0}header{display:block}a{background-color:transparent}a:active,a:hover{outline:0}h1{margin:.67em 0;font-size:2em}img{border:0}pre{overflow:auto}code,pre{font-family:monospace,monospace;font-size:1em}table{border-spacing:0;border-collapse:collapse}td,th{padding:0}@media print{*{color:#000!important;text-shadow:none!important;background:0 0!important;-webkit-box-shadow:none!important;box-shadow:none!important}a,a:visited{text-decoration:underline}a[href]:after{content:" (" attr(href) ")"}pre{border:1px solid #999;page-break-inside:avoid}thead{display:table-header-group}img,tr{page-break-inside:avoid}img{max-width:100%!important}h3{orphans:3;widows:3}h3{page-break-after:avoid}.table{border-collapse:collapse!important}.table td,.table th{background-color:#fff!important}}@font-face{font-family:'Glyphicons Halflings';src:url(../fonts/glyphicons-halflings-regular.eot);src:url(../fonts/glyphicons-halflings-regular.eot?#iefix) format('embedded-opentype'),url(../fonts/glyphicons-halflings-regular.woff2) format('woff2'),url(../fonts/glyphicons-halflings-regular.woff) format('woff'),url(../fonts/glyphicons-halflings-regular.ttf) format('truetype'),url(../fonts/glyphicons-halflings-regular.svg#glyphicons_halflingsregular) format('svg')}*{-webkit-box-sizing:border-box;-moz-box-sizing:border-box;box-sizing:border-box}html{font-size:10px;-webkit-tap-highlight-color:rgba(0,0,0,0)}body{font-family:"Helvetica Neue",Helvetica,Arial,sans-serif;font-size:14px;line-height:1.42857143;color:#333;background-color:#fff}a{color:#337ab7;text-decoration:none}a:focus,a:hover{color:#23527c;text-decoration:underline}a:focus{outline:5px auto -webkit-focus-ring-color;outline-offset:-2px}img{vertical-align:middle}h1,h3{font-family:inherit;font-weight:500;line-height:1.1;color:inherit}h1,h3{margin-top:20px;margin-bottom:10px}h1{font-size:36px}h3{font-size:24px}code,pre{font-family:Menlo,Monaco,Consolas,"Courier New",monospace}code{padding:2px 4px;font-size:90%;color:#c7254e;background-color:#f9f2f4;border-radius:4px}pre{display:block;padding:9.5px;margin:0 0 10px;font-size:13px;line-height:1.42857143;color:#333;word-break:break-all;word-wrap:break-word;background-color:#f5f5f5;border:1px solid #ccc;border-radius:4px}.container{padding-right:15px;padding-left:15px;margin-right:auto;margin-left:auto}@media (min-width:768px){.container{width:750px}}@media (min-width:992px){.container{width:970px}}@media (min-width:1200px){.container{width:1170px}}.row{margin-right:-15px;margin-left:-15px}.col-md-1,.col-md-10,.col-md-12,.col-sm-2,.col-sm-6,.col-xs-3,.col-xs-7{position:relative;min-height:1px;padding-right:15px;padding-left:15px}.col-xs-3,.col-xs-7{float:left}.col-xs-7{width:58.33333333%}.col-xs-3{width:25%}@media (min-width:768px){.col-sm-2,.col-sm-6{float:left}.col-sm-6{width:50%}.col-sm-2{width:16.66666667%}}@media (min-width:992px){.col-md-1,.col-md-10,.col-md-12{float:left}.col-md-12{width:100%}.col-md-10{width:83.33333333%}.col-md-1{width:8.33333333%}}table{background-color:transparent}th{text-align:left}.table{width:100%;max-width:100%;margin-bottom:20px}.table>tbody>tr>td,.table>thead>tr>th{padding:8px;line-height:1.42857143;vertical-align:top;border-top:1px solid #ddd}.table>thead>tr>th{vertical-align:bottom;border-bottom:2px solid #ddd}.table>thead:first-child>tr:first-child>th{border-top:0}.table-striped>tbody>tr:nth-of-type(odd){background-color:#f9f9f9}.container:after,.container:before,.row:after,.row:before{display:table;content:" "}.container:after,.row:after{clear:both}@-ms-viewport{width:device-width}
h1{margin-top:20px}*{-webkit-box-sizing:border-box;-moz-box-sizing:border-box;box-sizing:border-box}body{font-family:"Helvetica Neue",Helvetica,Arial,sans-serif;font-size:14px;line-height:1.42857143;color:#333;background-color:#fff;margin:0}h1{margin-bottom:10px;font-family:inherit;font-weight:500;line-height:1.1;color:inherit}.table{margin-bottom:20px}h1{font-size:36px}a{color:#337ab7;text-decoration:none}a:hover{color:#23527c}.container{padding-right:15px;padding-left:15px;margin-right:auto;margin-left:auto}@media (min-width:768px){.container{width:750px}}@media (min-width:992px){.container{width:970px}}@media (min-width:1200px){.container{width:1170px}}.table{width:100%;max-width:100%;background-color:transparent;border-spacing:0;border-collapse:collapse}.table-striped>tbody{background-color:#f9f9f9}.table>tbody>tr>td,.table>thead>tr>th{padding:8px;line-height:1.42857143;vertical-align:top;border-top:1px solid #ddd}.table>thead>tr>th{border-top:0;vertical-align:bottom;border-bottom:2px solid #ddd;text-align:left}code{padding:2px 4px;font-size:90%;color:#c7254e;background-color:#f9f2f4;border-radius:4px;font-family:Menlo,Monaco,Consolas,"Courier New",monospace}.row{margin-right:-15px;margin-left:-15px}.col-md-10{float:left;position:relative;min-height:1px;padding-right:15px;padding-left:15px}.col-md-10{width:83.33333333%}img{vertical-align:middle;border:0}.container{min-width:320px}body{font-family:helvetica}table{font-size:14px}table.table tbody tr td{border-top:0;padding:10px}pre{white-space:pre-line;margin-bottom:10px;max-height:275px;overflow:scroll}header{background-color:#ed605e;padding:10px 20px;box-sizing:border-box}.logo img{width:80px}.titles h1{font-size:30px;font-weight:300;color:#fff;margin:24px 0}.content h3{color:gray;margin:25px 0}.foot{padding:5px 0 20px;text-align:right;color:#c5c5c5;font-weight:300}.foot a{color:#8b8b8b;text-decoration:underline}.centered{text-align:center}@media all and (max-width:500px){.titles h1{font-size:25px;margin:26px 0}}@media all and (max-width:530px){.titles h1{font-size:20px;margin:24px 0}.logo{padding:0}.logo img{width:100%;max-width:80px}}
</style>
</head>
<body>
<header>
<div class="container">
<div class="row">
<div class="col-md-1 col-sm-2 col-xs-3 logo">
<a href="/"><img src="https://gobuffalo.io/assets/images/logo_med.png" alt=""></a>
</div>
<div class="col-md-10 col-sm-6 col-xs-7 titles">
<h1>
<%= status %> - ERROR!
</h1>
</div>
</div>
</div>
</header>
<div class="container content">
<div class="row">
<div class="col-md-12">
<h3>Error Trace</h3>
<pre><%= error %></pre>
<h3>Context</h3>
<pre><%= inspect(context) %></pre>
<h3>Parameters</h3>
<pre><%= inspect(params) %></pre>
<h3>Headers</h3>
<pre><%= inspect(headers) %></pre>
<h3>Form</h3>
<pre><%= inspect(posted_form) %></pre>
<h3>Routes</h3>
<table class="table table-striped">
<thead>
<tr text-align="left">
<th class="centered">METHOD</th>
<th>PATH</th>
<th>NAME</th>
<th>HANDLER</th>
</tr>
</thead>
<tbody>
<%= for (r) in routes { %>
<tr>
<td class="centered">
<%= r.Method %>
</td>
<td>
<%= if (r.Method != "GET" || r.Path ~= "{") { %>
<%= r.Path %>
<% } else { %>
<a href="<%= r.Path %>"><%= r.Path %></a>
<% } %>
</td>
<td>
<%= r.PathName %>
</td>
<td><code><%= r.HandlerName %></code></td>
</tr>
<% } %>
</tbody>
</table>
</div>
</div>
<div class="foot"> <span> Powered by <a href="http://gobuffalo.io/">gobuffalo.io</a></span></div>
</div>
</body>
</html>
`
var prodErrorTmpl = `
<h1>We're Sorry!</h1>
<p>
It looks like something went wrong! Don't worry, we are aware of the problem and are looking into it.
</p>
<p>
Sorry if this has caused you any problems. Please check back again later.
</p>
`