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|
package httperrors
import (
"fmt"
"net/http"
"time"
"gitlab.com/gitlab-org/labkit/correlation"
"gitlab.com/gitlab-org/labkit/errortracking"
"gitlab.com/gitlab-org/labkit/log"
internalCtx "gitlab.com/gitlab-org/gitlab-pages/internal/ctx"
)
type content struct {
status int
title string
statusString string
header string
subHeader string
}
var (
content401 = content{
http.StatusUnauthorized,
"Unauthorized (401)",
"401",
"You don't have permission to access the resource.",
`<p>The resource that you are attempting to access is protected and you don't have the necessary permissions to view it.</p>`,
}
content404 = content{
http.StatusNotFound,
"The page you're looking for could not be found (404)",
"404",
"The page you're looking for could not be found.",
`<p>The resource that you are attempting to access does not exist or you don't have the necessary permissions to view it.</p>
<p>Make sure the address is correct and that the page hasn't moved.</p>
<p>Please contact your GitLab administrator if you think this is a mistake.</p>`,
}
content414 = content{
status: http.StatusRequestURITooLong,
title: "Request URI Too Long (414)",
statusString: "414",
header: "Request URI Too Long.",
subHeader: `<p>The URI provided was too long for the server to process.</p>
<p>Try to make the request URI shorter.</p>`,
}
content429 = content{
http.StatusTooManyRequests,
"Too many requests (429)",
"429",
"Too many requests.",
`<p>The resource that you are attempting to access is being rate limited.</p>`,
}
content500 = content{
http.StatusInternalServerError,
"Something went wrong (500)",
"500",
"Whoops, something went wrong on our end.",
`<p>Try refreshing the page, or going back and attempting the action again.</p>
<p>Please contact your GitLab administrator if this problem persists.</p>`,
}
content502 = content{
http.StatusBadGateway,
"Something went wrong (502)",
"502",
"Whoops, something went wrong on our end.",
`<p>Try refreshing the page, or going back and attempting the action again.</p>
<p>Please contact your GitLab administrator if this problem persists.</p>`,
}
content503 = content{
http.StatusServiceUnavailable,
"Service Unavailable (503)",
"503",
"Whoops, something went wrong on our end.",
`<p>Try refreshing the page, or going back and attempting the action again.</p>
<p>Please contact your GitLab administrator if this problem persists.</p>`,
}
)
const predefinedErrorPage = `
<!DOCTYPE html>
<html>
<head>
<meta content="width=device-width, initial-scale=1, maximum-scale=1" name="viewport">
<title>%v</title>
<style>
body {
color: #666;
text-align: center;
font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
margin: auto;
font-size: 14px;
}
h1 {
font-size: 56px;
line-height: 100px;
font-weight: 400;
color: #456;
}
h2 {
font-size: 24px;
color: #666;
line-height: 1.5em;
}
h3 {
color: #456;
font-size: 20px;
font-weight: 400;
line-height: 28px;
}
hr {
max-width: 800px;
margin: 18px auto;
border: 0;
border-top: 1px solid #EEE;
border-bottom: 1px solid white;
}
img {
max-width: 40vw;
display: block;
margin: 40px auto;
}
a {
line-height: 100px;
font-weight: 400;
color: #4A8BEE;
font-size: 18px;
text-decoration: none;
}
.container {
margin: auto 20px;
}
.go-back {
display: none;
}
</style>
</head>
<body>
<img src="data:image/svg+xml;base64,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"
alt="GitLab Logo" />
<h1>
%v
</h1>
<div class="container">
<h3>%v</h3>
<hr />
%v
<a href="javascript:history.back()" class="js-go-back go-back">Go back</a>
</div>
<script>
(function () {
var goBack = document.querySelector('.js-go-back');
if (history.length > 1) {
goBack.style.display = 'inline';
}
})();
</script>
</body>
</html>
`
func generateErrorHTML(c content) string {
return fmt.Sprintf(predefinedErrorPage, c.title, c.statusString, c.header, c.subHeader)
}
func serveErrorPage(w http.ResponseWriter, c content) {
w.Header().Set("Content-Type", "text/html; charset=utf-8")
w.Header().Set("X-Content-Type-Options", "nosniff")
w.WriteHeader(c.status)
fmt.Fprintln(w, generateErrorHTML(c))
}
// Serve401 returns a 401 error response / HTML page to the http.ResponseWriter
func Serve401(w http.ResponseWriter) {
serveErrorPage(w, content401)
}
// Serve404 returns a 404 error response / HTML page to the http.ResponseWriter
func Serve404(w http.ResponseWriter) {
serveErrorPage(w, content404)
}
// Serve414 returns a 414 error response / HTML page to the http.ResponseWriter
func Serve414(w http.ResponseWriter) {
serveErrorPage(w, content414)
}
// Serve429 returns a 429 error response / HTML page to the http.ResponseWriter
func Serve429(w http.ResponseWriter) {
serveErrorPage(w, content429)
}
// Serve500 returns a 500 error response / HTML page to the http.ResponseWriter
func Serve500(w http.ResponseWriter) {
serveErrorPage(w, content500)
}
// Serve500WithRequest returns a 500 error response / HTML page to the http.ResponseWriter
func Serve500WithRequest(w http.ResponseWriter, r *http.Request, reason string, err error) {
log.WithFields(log.Fields{
"correlation_id": correlation.ExtractFromContext(r.Context()),
"duration_ms": time.Since(internalCtx.GetStartTime(r.Context())).Milliseconds(),
"host": r.Host,
"path": r.URL.Path,
}).WithError(err).Error(reason)
errortracking.Capture(err, errortracking.WithRequest(r))
serveErrorPage(w, content500)
}
// Serve502 returns a 502 error response / HTML page to the http.ResponseWriter
func Serve502(w http.ResponseWriter) {
serveErrorPage(w, content502)
}
// Serve503 returns a 503 error response / HTML page to the http.ResponseWriter
func Serve503(w http.ResponseWriter) {
serveErrorPage(w, content503)
}
|
