package main
import (
"html/template"
"log"
"net/http"
)
const css = `
body {
font-family: Arial, sans-serif;
background-color: #f2f2f2;
margin: 0;
}
.header {
text-align: center;
margin-bottom: 20px;
}
.dex {
font-size: 2em;
font-weight: bold;
color: #3F9FD8; /* Main color */
}
.example-app {
font-size: 1em;
color: #EF4B5C; /* Secondary color */
}
.form-instructions {
text-align: center;
margin-bottom: 15px;
font-size: 1em;
color: #555;
}
hr {
border: none;
border-top: 1px solid #ccc;
margin-top: 10px;
margin-bottom: 20px;
}
label {
flex: 1;
font-weight: bold;
color: #333;
}
p {
margin-bottom: 15px;
display: flex;
align-items: center;
}
input[type="text"] {
flex: 2;
padding: 8px;
border: 1px solid #ccc;
border-radius: 4px;
outline: none;
}
input[type="checkbox"] {
margin-left: 10px;
transform: scale(1.2);
}
.back-button {
display: inline-block;
padding: 8px 16px;
background-color: #EF4B5C; /* Secondary color */
color: white;
border: none;
border-radius: 4px;
cursor: pointer;
font-size: 12px;
text-decoration: none;
transition: background-color 0.3s ease, transform 0.2s ease;
box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
position: fixed;
right: 20px;
bottom: 20px;
}
.back-button:hover {
background-color: #C43B4B; /* Darker shade of secondary color */
}
.token-block {
background-color: #fff;
padding: 10px 15px;
border-radius: 8px;
box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
margin-bottom: 15px;
word-wrap: break-word;
display: flex;
flex-direction: column;
gap: 5px;
position: relative;
}
.token-title {
font-weight: bold;
display: flex;
justify-content: space-between;
align-items: center;
}
.token-title a {
font-size: 0.9em;
text-decoration: none;
color: #3F9FD8; /* Main color */
}
.token-title a:hover {
text-decoration: underline;
}
.token-code {
overflow-wrap: break-word;
word-break: break-all;
white-space: normal;
}
pre {
white-space: pre-wrap;
background-color: #f9f9f9;
padding: 8px;
border-radius: 4px;
border: 1px solid #ddd;
margin: 0;
font-family: 'Courier New', Courier, monospace;
overflow-x: auto;
font-size: 0.9em;
position: relative;
margin-top: 5px;
}
pre .key {
color: #c00;
}
pre .string {
color: #080;
}
pre .number {
color: #00f;
}
`
var indexTmpl = template.Must(template.New("index.html").Parse(`<html>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Example App - Login</title>
<style>
` + css + `
body {
display: flex;
justify-content: center;
align-items: center;
height: 100vh;
flex-direction: column;
}
form {
background-color: #fff;
padding: 20px;
border-radius: 8px;
box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
width: 100%;
max-width: 400px;
}
input[type="submit"] {
width: 100%;
padding: 10px;
background-color: #3F9FD8; /* Main color */
color: white;
border: none;
border-radius: 4px;
cursor: pointer;
font-size: 16px;
}
input[type="submit"]:hover {
background-color: #357FAA; /* Darker shade of main color */
}
</style>
</head>
<body>
<div class="header">
<div class="dex">Dex</div>
<div class="example-app">Example App</div>
</div>
<form action="/login" method="post">
<div class="form-instructions">
If needed, customize your login settings below, then click <strong>Login</strong> to proceed.
</div>
<hr/>
<p>
<label for="cross_client">Authenticate for:</label>
<input type="text" id="cross_client" name="cross_client" placeholder="list of client-ids">
</p>
<p>
<label for="extra_scopes">Extra scopes:</label>
<input type="text" id="extra_scopes" name="extra_scopes" placeholder="list of scopes">
</p>
<p>
<label for="connector_id">Connector ID:</label>
<input type="text" id="connector_id" name="connector_id" placeholder="connector id">
</p>
<p>
<label for="offline_access">Request offline access:</label>
<input type="checkbox" id="offline_access" name="offline_access" value="yes" checked>
</p>
<p>
<input type="submit" value="Login">
</p>
</form>
</body>
</html>`))
func renderIndex(w http.ResponseWriter) {
renderTemplate(w, indexTmpl, nil)
}
type tokenTmplData struct {
IDToken string
AccessToken string
RefreshToken string
RedirectURL string
Claims string
}
var tokenTmpl = template.Must(template.New("token.html").Parse(`<html>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Tokens</title>
<style>
` + css + `
body {
color: #333;
margin: 0;
padding: 20px;
position: relative;
}
input[type="submit"] {
margin-top: 10px;
padding: 8px 16px;
background-color: #3F9FD8; /* Main color */
color: white;
border: none;
border-radius: 4px;
cursor: pointer;
font-size: 14px;
transition: background-color 0.3s ease;
}
input[type="submit"]:hover {
background-color: #357FAA; /* Darker shade of main color */
}
</style>
</head>
<body>
{{ if .IDToken }}
<div class="token-block">
<div class="token-title">
ID Token:
<a href="#" onclick="window.open('https://jwt.io/#debugger-io?token=' + encodeURIComponent('{{ .IDToken }}'), '_blank')">Decode on jwt.io</a>
</div>
<pre><code class="token-code">{{ .IDToken }}</code></pre>
</div>
{{ end }}
{{ if .AccessToken }}
<div class="token-block">
<div class="token-title">
Access Token:
<a href="#" onclick="window.open('https://jwt.io/#debugger-io?token=' + encodeURIComponent('{{ .AccessToken }}'), '_blank')">Decode on jwt.io</a>
</div>
<pre><code class="token-code">{{ .AccessToken }}</code></pre>
</div>
{{ end }}
{{ if .Claims }}
<div class="token-block">
<div class="token-title">Claims:</div>
<pre><code id="claims">{{ .Claims }}</code></pre>
</div>
{{ end }}
{{ if .RefreshToken }}
<div class="token-block">
<div class="token-title">Refresh Token:</div>
<pre><code class="token-code">{{ .RefreshToken }}</code></pre>
<form action="{{ .RedirectURL }}" method="post">
<input type="hidden" name="refresh_token" value="{{ .RefreshToken }}">
<input type="submit" value="Redeem refresh token">
</form>
</div>
{{ end }}
<a href="/" class="back-button">Back to Home</a>
<script>
// Simple JSON syntax highlighter
document.addEventListener("DOMContentLoaded", function() {
const claimsElement = document.getElementById("claims");
if (claimsElement) {
try {
const json = JSON.parse(claimsElement.textContent);
claimsElement.innerHTML = syntaxHighlight(json);
} catch (e) {
console.error("Invalid JSON in claims:", e);
}
}
});
function syntaxHighlight(json) {
if (typeof json != 'string') {
json = JSON.stringify(json, undefined, 2);
}
json = json.replace(/&/g, '&').replace(/</g, '<').replace(/>/g, '>');
return json.replace(/("(\\u[\da-fA-F]{4}|\\[^u]|[^\\"])*"(\s*:)?|\b(true|false|null)\b|\b\d+\b)/g, function (match) {
let cls = 'number';
if (/^"/.test(match)) {
if (/:$/.test(match)) {
cls = 'key';
} else {
cls = 'string';
}
} else if (/true|false/.test(match)) {
cls = 'boolean';
} else if (/null/.test(match)) {
cls = 'null';
}
return '<span class="' + cls + '">' + match + '</span>';
});
}
</script>
</body>
</html>
`))
func renderToken(w http.ResponseWriter, redirectURL, idToken, accessToken, refreshToken, claims string) {
renderTemplate(w, tokenTmpl, tokenTmplData{
IDToken: idToken,
AccessToken: accessToken,
RefreshToken: refreshToken,
RedirectURL: redirectURL,
Claims: claims,
})
}
func renderTemplate(w http.ResponseWriter, tmpl *template.Template, data interface{}) {
err := tmpl.Execute(w, data)
if err == nil {
return
}
switch err := err.(type) {
case *template.Error:
// An ExecError guarantees that Execute has not written to the underlying reader.
log.Printf("Error rendering template %s: %s", tmpl.Name(), err)
// TODO(ericchiang): replace with better internal server error.
http.Error(w, "Internal server error", http.StatusInternalServerError)
default:
// An error with the underlying write, such as the connection being
// dropped. Ignore for now.
}
}