basic-example.auth.pilcrowonpaper.com/pages.go at main · pilcrowonpaper/basic-example.auth.pilcrowonpaper.com · GitHub

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package main

import (
	"crypto/sha256"
	"fmt"
	"html"

	"github.com/pilcrowonpaper/go-json"

	_ "embed"
)

func createUnexpectedErrorErrorPageHTML(requestId string) (string, [][]byte, [][]byte) {
	pageTitle := "An unexpected error occurred | Basic auth example"

	bodyHTML := `<h1>An unexpected error occurred</h1>
<p>Something went wrong. Please refresh the page or try again later.</p>`

	pageHTML, pageScriptHashes, pageStylesheetHashes := createPageHTML(requestId, pageTitle, bodyHTML, "", "", "")

	return pageHTML, pageScriptHashes, pageStylesheetHashes
}

//go:embed assets/base.css
var baseStylesheet string

//go:embed assets/base.js
var baseScript string

func createPageHTML(requestId string, title string, bodyHTML string, script string, stylesheet string, dataJSON string) (string, [][]byte, [][]byte) {
	baseScriptHash := sha256.Sum256([]byte(baseScript))
	scriptHash := sha256.Sum256([]byte(script))
	scriptHashes := [][]byte{baseScriptHash[:], scriptHash[:]}

	baseStylesheetHash := sha256.Sum256([]byte(baseStylesheet))
	stylesheetHash := sha256.Sum256([]byte(stylesheet))
	stylesheetHashes := [][]byte{baseStylesheetHash[:], stylesheetHash[:]}

	htmlTemplate := `<html lang="en">
<head>
	<title>%s</title>
	<meta name="description" content="An example website that implements email address and password authentication." />

	<meta charset="utf-8" />
    <meta name="viewport" content="width=device-width" />

	<meta property="og:title" content="%s" />
	<meta property="og:type" content="website" />
	<meta property="og:locale" content="en_US" />
	<meta property="og:site_name" content="Basic auth example" />
	<meta property="og:description" content="An example website that implements email address and password authentication." />
	<meta property="og:url" content="https://basic-example.auth.pilcrowonpaper.com" />
	<meta property="og:image" content="https://pilcrowonpaper.com/pilcrow.jpeg" />

	<meta name="twitter:card" content="summary">
    <meta name="twitter:site" content="@pilcrowonpaper">

	<link rel="icon" type="image/jpeg" href="https://pilcrowonpaper.com/pilcrow.jpeg">

	<style>%s</style>
	<style>%s</style>
</head>

<body>
	<header>
		<a id="home-link" href="/">Basic auth example</a>
	</header>
	<main>%s</main>
	<footer>
		<p>Created by <a href="https://pilcrowonpaper.com">pilcrow</a></p>
		<p>Source code: <a href="https://github.com/pilcrowonpaper/basic-example.auth.pilcrowonpaper.com">github.com/pilcrowonpaper/basic-example.auth.pilcrowonpaper.com</a></p>
		<p>Questions and support: <a href="mailto:examples@auth.pilcrowonpaper.com">examples@auth.pilcrowonpaper.com</a></p>
		<p>Request ID: %s</p>
	</footer>
</body>
<script id="data" type="application/json">%s</script>
<script>%s</script>
<script>%s</script>
</html>`

	pageHTML := fmt.Sprintf(
		htmlTemplate,
		html.EscapeString(title),
		html.EscapeString(title),
		baseStylesheet,
		stylesheet,
		bodyHTML,
		html.EscapeString(requestId),
		dataJSON,
		baseScript,
		script,
	)

	return pageHTML, scriptHashes, stylesheetHashes
}

var htmlSafeJSONStringCharacterEscapingBehavior json.StringCharacterEscapingBehaviorInterface = htmlSafeJSONStringCharacterEscapingBehaviorStruct{}

type htmlSafeJSONStringCharacterEscapingBehaviorStruct struct{}

func (htmlSafeJSONStringCharacterEscapingBehaviorStruct) UseCharacter(r rune) bool {
	return r != '<' && r != '>'
}

func (htmlSafeJSONStringCharacterEscapingBehaviorStruct) UseShorthandEscapeSequence(_ rune) bool {
	return true
}