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app.ts
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app.ts
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require("dotenv").config();
if (!process.env.SITE_BASEURL) throw new Error("SITE_BASEURL is not set");
if (!process.env.ADMIN_USER) throw new Error("ADMIN_USER is not set");
if (!process.env.ADMIN_PASS) throw new Error("ADMIN_PASS is not set");
if (!process.env.UPLOAD_LIMIT_MB) throw new Error("UPLOAD_LIMIT_MB is not set");
process.env.TZ = "Asia/Tokyo";
const SITE_BASEURL = process.env.SITE_BASEURL;
const ADMIN_USER = process.env.ADMIN_USER;
const ADMIN_PASS = process.env.ADMIN_PASS;
const UPLOAD_LIMIT_MB = parseInt(process.env.UPLOAD_LIMIT_MB); // MB
import moment from "moment";
import "moment/locale/ja";
import { name as APP_NAME, version as APP_VERSION } from "./package.json";
import express from "express";
import path from "path";
import fs, { createWriteStream } from "fs";
import multer from "multer";
import auth from "basic-auth";
import compare from "tsscmp";
import axios, { Axios, AxiosError } from "axios";
import { v4 as uuidv4 } from 'uuid';
const app = express();
interface Pagination {
index: number;
size: number;
prev: number | null;
next: number | null;
files: string[];
}
interface ImageProvider {
files: string[];
pagination: Pagination;
}
const PAGE_SIZE = 20 as const;
const ALLOWED_FORMATS_REGEX = /\.(gif|jpe?g|tiff?|png|webp|bmp|svg)$/i;
const ALLOWED_FORMATS = ".png .jpg .jpeg .gif .webp .bmp .tiff .svg" as const;
function paginate(array: string[], size: number, index: number) {
return array.slice((index - 1) * size, index * size);
}
/**
* 画像ファイルを読み込む
* @returns string[]
*/
function readSyncImageFiles() {
return fs
.readdirSync(path.join(__dirname, "storage"))
.filter((fileName) => ALLOWED_FORMATS_REGEX.test(fileName))
.map(
(fileName) =>
({
fileName,
time: fs
.statSync(path.join(__dirname, "storage", fileName))
.mtime.getTime(),
} as { fileName: string; time: number })
)
.sort((a, b) => b.time - a.time)
.map((file) => file.fileName); // 最新順にソート
}
app.get("/", (req, res, next) => {
const { page } = req.query;
const files = readSyncImageFiles();
const index = page && typeof page === "string" ? parseInt(page) : 1 as const;
const paginated = paginate(files, PAGE_SIZE, index);
const prevPaginated = paginate(files, PAGE_SIZE, index - 1);
const nextPaginated = paginate(files, PAGE_SIZE, index + 1);
const pagination = {
index,
size: PAGE_SIZE,
prev: prevPaginated.length != 0 ? index - 1 : null,
next: nextPaginated.length != 0 ? index + 1 : null,
files: paginated,
};
const provider = { files, pagination };
res.setHeader("Content-Type", "text/html");
res.setHeader("Content-DPR", "2.0");
res.send(IndexPage(provider));
});
const storage = multer.diskStorage({
destination: function (req, file, cb) {
cb(null, path.join(__dirname, "storage"));
},
filename: function (req, file, cb) {
cb(
null,
file.originalname.split(".")[0] +
"-" +
moment(Date.now()).format("YYYYMMDDHHmmss") +
file.originalname.match(/\..*$/)![0]
);
},
});
const uploader = multer({
storage,
limits: { fileSize: UPLOAD_LIMIT_MB * 1024 * 1024 },
fileFilter: (req, file, cb) => {
if (
file.mimetype === "image/png" ||
file.mimetype === "image/jpg" ||
file.mimetype === "image/jpeg" ||
file.mimetype === "image/gif" ||
file.mimetype === "image/webp" ||
file.mimetype === "image/bmp" ||
file.mimetype === "image/tiff" ||
file.mimetype === "image/svg+xml"
) {
cb(null, true);
} else {
cb(null, false);
const err = new Error(
`サポートされているファイル形式: ${ALLOWED_FORMATS}`
);
err.name = "ExtensionError";
return cb(err);
}
},
}).array("images", 4);
function checkAuth(user: string, pass: string) {
let valid = true;
valid = compare(user, ADMIN_USER) && valid;
valid = compare(pass, ADMIN_PASS) && valid;
return valid;
}
app.post("/upload", (req, res, next) => {
const credentials = auth(req);
if (!credentials || !checkAuth(credentials.name, credentials.pass)) {
res.status(401);
res.setHeader(
"WWW-Authenticate",
'Basic realm="Access to the staging site", charset="UTF-8"'
);
res.end("Access denied");
return;
}
uploader(req, res, function (err) {
if (err instanceof multer.MulterError) {
res
.status(500)
.send({ error: { message: `Multer uploading error: ${err.message}` } })
.end();
return;
} else if (err) {
if (err.name == "ExtensionError") {
res
.status(413)
.send({ error: { message: err.message } })
.end();
} else {
res
.status(500)
.send({
error: { message: `unknown uploading error: ${err.message}` },
})
.end();
}
return;
}
res.redirect(SITE_BASEURL);
});
});
app.get("/upload", (req, res) => {
const files = readSyncImageFiles();
res.setHeader("Content-Type", "text/html");
res.status(201);
res.send(UploadPage(files));
});
app.get("/delete", (req, res, next) => {
const { page } = req.query;
const files = readSyncImageFiles();
const index = page && typeof page === "string" ? parseInt(page) : 1 as const;
const paginated = paginate(files, PAGE_SIZE, index);
const prevPaginated = paginate(files, PAGE_SIZE, index - 1);
const nextPaginated = paginate(files, PAGE_SIZE, index + 1);
const pagination = {
index,
size: PAGE_SIZE,
prev: prevPaginated.length != 0 ? index - 1 : null,
next: nextPaginated.length != 0 ? index + 1 : null,
files: paginated,
};
const provider = { files, pagination };
res.setHeader("Content-Type", "text/html");
res.setHeader("Content-DPR", "2.0");
res.send(DeletePage(provider));
});
app.delete("/delete", (req, res, next) => {
const credentials = auth(req);
if (!credentials || !checkAuth(credentials.name, credentials.pass)) {
res.status(401);
res.setHeader(
"WWW-Authenticate",
'Basic realm="Access to the staging site", charset="UTF-8"'
);
res.end("Access denied");
return;
}
const { fileName } = req.query;
if (!fileName || typeof fileName !== "string") return next();
// 画像ファイルが存在しない
if (!fs.existsSync(path.resolve(__dirname, "storage", fileName)))
return res.status(404).end();
try {
// 画像ファイル削除
fs.unlinkSync(path.resolve(__dirname, "storage", fileName));
} catch (error) {
res.status(500).send(error).end();
}
res.status(204); // >> 論理削除なら200、物理削除なら204でいけそうです by https://qiita.com/mfykmn/items/02a0b5448228e0b248b3
res.end();
});
app.get("/i/:fileName", (req, res, next) => {
const { fileName } = req.params;
if (!fileName || typeof fileName !== "string") return next();
if (!ALLOWED_FORMATS_REGEX.test(fileName))
return res.status(415).send({ error: "Unsupported Media Type" }).end();
const files = readSyncImageFiles();
const index = 1 as const;
const paginated = paginate(files, PAGE_SIZE, index);
const prevPaginated = paginate(files, PAGE_SIZE, index - 1);
const nextPaginated = paginate(files, PAGE_SIZE, index + 1);
const pagination = {
index,
size: PAGE_SIZE,
prev: prevPaginated.length != 0 ? index - 1 : null,
next: nextPaginated.length != 0 ? index + 1 : null,
files: paginated,
};
const provider = { files, pagination };
res.setHeader("Content-Type", "text/html");
res.send(ImagePage(fileName, provider));
});
app.get("/url2image", async (req, res, next) => {
const files = readSyncImageFiles();
res.setHeader("Content-Type", "text/html");
res.send(Url2ImagePage(files));
});
app.put("/url2image", async (req, res, next) => {
const credentials = auth(req);
if (!credentials || !checkAuth(credentials.name, credentials.pass)) {
res.status(401);
res.setHeader(
"WWW-Authenticate",
'Basic realm="Access to the staging site", charset="UTF-8"'
);
res.end("Access denied");
return;
}
const { url } = req.query;
if (!url || typeof url !== "string") return next();
console.log("url: " + url);
axios({
method: "get",
url: url,
responseType: "stream",
})
.then((response) => {
const contentType = response.headers["content-type"];
if (!contentType.startsWith("image")) return res.status(500).end();
const ext = contentType.split("/")[1];
const destFileName = `${uuidv4()}-${moment(Date.now()).format("YYYYMMDDHHmmss")}.${ext}`
const writer = createWriteStream(
path.resolve(
__dirname,
"storage",
destFileName
)
);
response.data.pipe(writer);
res.status(200).send({imageUrl: `${SITE_BASEURL}/${destFileName}`, fileName: destFileName}).end();
})
.catch((err: AxiosError) => {
console.log(err);
res.status(500).send({ err }).end();
});
});
app.use(
express.static(path.join(__dirname, "storage"), {
setHeaders: function (res, path) {
res.setHeader(
"Cache-Control",
"max-age=86400, public, stale-while-revalidate"
);
res.setHeader("Content-DPR", "2.0");
},
})
);
const IndexPage = ({ files, pagination }: ImageProvider) => `
<!DOCTYPE html>
<html lang="ja">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>images.iamtakagi.net</title>
<meta
property="description"
content="画像配信サーバ"
/>
<meta
property="og:title"
content="images.iamtakagi.net"
/>
<meta
property="og:description"
content="画像配信サーバ"
/>
<style>
h1 {
font-size: 1.3rem;
}
h2 {
font-size: 1.2rem;
}
h3 {
font-size: 1.1rem;
}
table {
border-collapse: collapse;
}
table,
th,
td {
border: 1px solid gray;
}
th,
td {
padding: 8px;
}
img {
max-width:20%;
cursor:pointer;
transition:0.3s;
}
img:hover {opacity: 0.7;}
.modal {
display: none; /* Hidden by default */
position: fixed; /* Stay in place */
z-index: 1; /* Sit on top */
padding-top: 100px; /* Location of the box */
left: 0;
top: 0;
width: 100%; /* Full width */
height: 100%; /* Full height */
overflow: auto; /* Enable scroll if needed */
background-color: rgb(0,0,0); /* Fallback color */
background-color: rgba(0,0,0,0.9); /* Black w/ opacity */
}
.modal-content {
margin: auto;
display: block;
width: 80%;
max-width: 700px;
}
#caption {
margin: auto;
display: block;
width: 80%;
max-width: 700px;
text-align: center;
color: #ccc;
padding: 10px 0;
height: 150px;
}
/* Add Animation - Zoom in the Modal */
.modal-content, #caption {
animation-name: zoom;
animation-duration: 0.6s;
}
@keyframes zoom {
from {transform:scale(0)}
to {transform:scale(1)}
}
/* The Close Button */
.close {
position: absolute;
top: 15px;
right: 35px;
color: #f1f1f1;
font-size: 40px;
font-weight: bold;
transition: 0.3s;
}
.close:hover,
.close:focus {
color: #bbb;
text-decoration: none;
cursor: pointer;
}
/* 100% Image Width on Smaller Screens */
@media only screen and (max-width: 700px){
.modal-content {
width: 100%;
}
}
</style>
</head>
<body>
<header style="display:flex;flex-direction:column;">
<section style="margin-bottom:1rem;">
<h1 style="margin:0;">画像配信サーバ</h1>
<p style="margin:0;">画像置き場 (?)</p>
</section>
<span>画像ファイル数: ${files.length}</span>
<nav style="display:flex;flex-direction:column;">
<a href="/upload">画像ファイルをアップロードする (管理者用)</a>
<a href="/delete">画像ファイルを削除する (管理者用)</a>
<a href="/url2image">URL を介してサーバで直接ダウンロードする (管理者用)</a>
</nav>
</header>
<hr style="margin-top: 1.2rem; margin-bottom: 1.2rem;" />
<main>
<section>
<h2>配信されている画像一覧</h2>
<div style="display:flex;flex-wrap:wrap;">
${pagination.files
.map((file) => {
return `<img src="${SITE_BASEURL}/${file}" alt="${file}"></img>`;
})
.join("")}
</div>
<span style="margin-top:1rem;display:inline-block;">
${
pagination.prev
? `<a href="${SITE_BASEURL}?page=${pagination.prev}" style="margin-right:.7rem;"><- 前のページ</a>`
: ``
}
${
pagination.next
? `<a href="${SITE_BASEURL}?page=${pagination.next}">次のページ -></a>`
: ``
}
</span>
</section>
<div id="modal" class="modal">
<span class="close">×</span>
<img class="modal-content" id="modal-img" />
<div id="caption"></div>
</div>
</main>
<hr style="margin-top: 1.2rem" />
<footer style="display: flex; flex-direction: column;">
<span>
GitHub:
<a href="https://github.com/iamtakagi/images">
https://github.com/iamtakagi/images
</a>
</span>
<span>
Author: <a href="https://github.com/iamtakagi">iamtakagi</a>
</span>
<span>© iamtakagi.net</span>
</footer>
<script type="text/javascript">
(() => {
Array.from(document.getElementsByTagName("img")).map((img) => {
img.onclick = function () {
history.pushState(null, null, "/i/" + this.alt);
const modal = document.getElementById("modal");
const modalImg = document.getElementById("modal-img");
const caption = document.getElementById("caption");
modal.style.display = "block";
modalImg.src = this.src;
modalImg.alt = this.alt;
caption.innerText = this.alt;
const span = document.getElementsByClassName("close")[0];
span.onclick = function () {
history.pushState(null, null, "/");
modal.style.display = "none";
};
};
});
})();
</script>
</body>
</html>
`;
const ImagePage = (
fileName: string,
{ files, pagination }: ImageProvider
) => `
<!DOCTYPE html>
<html lang="ja">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>images.iamtakagi.net</title>
<meta
property="description"
content="${fileName}"
/>
<meta
property="og:title"
content="images.iamtakagi.net"
/>
<meta
property="og:description"
content="${fileName}"
/>
<meta
property="og:image"
content="${SITE_BASEURL}/${fileName}"
/>
<meta name="twitter:card" content="summary_large_image" />
<style>
h1 {
font-size: 1.3rem;
}
h2 {
font-size: 1.2rem;
}
h3 {
font-size: 1.1rem;
}
table {
border-collapse: collapse;
}
table,
th,
td {
border: 1px solid gray;
}
th,
td {
padding: 8px;
}
img {
max-width:20%;
cursor:pointer;
transition:0.3s;
}
img:hover {opacity: 0.7;}
.modal {
display: none; /* Hidden by default */
position: fixed; /* Stay in place */
z-index: 1; /* Sit on top */
padding-top: 100px; /* Location of the box */
left: 0;
top: 0;
width: 100%; /* Full width */
height: 100%; /* Full height */
overflow: auto; /* Enable scroll if needed */
background-color: rgb(0,0,0); /* Fallback color */
background-color: rgba(0,0,0,0.9); /* Black w/ opacity */
}
.modal-content {
margin: auto;
display: block;
width: 80%;
max-width: 700px;
}
#caption {
margin: auto;
display: block;
width: 80%;
max-width: 700px;
text-align: center;
color: #ccc;
padding: 10px 0;
height: 150px;
}
/* Add Animation - Zoom in the Modal */
.modal-content, #caption {
animation-name: zoom;
animation-duration: 0.6s;
}
@keyframes zoom {
from {transform:scale(0)}
to {transform:scale(1)}
}
/* The Close Button */
.close {
position: absolute;
top: 15px;
right: 35px;
color: #f1f1f1;
font-size: 40px;
font-weight: bold;
transition: 0.3s;
}
.close:hover,
.close:focus {
color: #bbb;
text-decoration: none;
cursor: pointer;
}
/* 100% Image Width on Smaller Screens */
@media only screen and (max-width: 700px){
.modal-content {
width: 100%;
}
}
</style>
</head>
<body>
<header style="display:flex;flex-direction:column;">
<section style="margin-bottom:1rem;">
<h1 style="margin:0;">画像配信サーバ</h1>
<p style="margin:0;">画像置き場 (?)</p>
</section>
<span>画像ファイル数: ${files.length}</span>
<nav style="display:flex;flex-direction:column;">
<a href="/upload">画像ファイルをアップロードする (管理者用)</a>
<a href="/delete">画像ファイルを削除する (管理者用)</a>
<a href="/url2image">URL を介してサーバで直接ダウンロードする (管理者用)</a>
</nav>
</header>
<hr style="margin-top: 1.2rem; margin-bottom: 1.2rem;" />
<main>
<section>
<h2>配信されている画像一覧</h2>
<div style="display:flex;flex-wrap:wrap;">
${pagination.files
.map((file) => {
return `<img src="${SITE_BASEURL}/${file}" alt="${file}"></img>`;
})
.join("")}
</div>
<span style="margin-top:1rem;display:inline-block;">
${
pagination.prev
? `<a href="${SITE_BASEURL}?page=${pagination.prev}" style="margin-right:.7rem;"><- 前のページ</a>`
: ``
}
${
pagination.next
? `<a href="${SITE_BASEURL}?page=${pagination.next}">次のページ -></a>`
: ``
}
</span>
</section>
<div id="modal" class="modal">
<span class="close">×</span>
<img class="modal-content" id="modal-img" />
<div id="caption"></div>
</div>
</main>
<hr style="margin-top: 1.2rem" />
<footer style="display: flex; flex-direction: column;">
<span>
GitHub:
<a href="https://github.com/iamtakagi/images">
https://github.com/iamtakagi/images
</a>
</span>
<span>
Author: <a href="https://github.com/iamtakagi">iamtakagi</a>
</span>
<span>© iamtakagi.net</span>
</footer>
<script type="text/javascript">
(() => {
const modal = document.getElementById("modal");
const modalImg = document.getElementById("modal-img");
const caption = document.getElementById("caption");
modal.style.display = "block";
modalImg.src = "${SITE_BASEURL}/${fileName}";
modalImg.alt = "${fileName}";
caption.innerText = "${fileName}";
const span = document.getElementsByClassName("close")[0];
span.onclick = function () {
history.pushState(null, null, "/");
modal.style.display = "none";
};
Array.from(document.getElementsByTagName("img")).map((img) => {
img.onclick = function () {
history.pushState(null, null, "/i/" + this.alt);
const modal = document.getElementById("modal");
const modalImg = document.getElementById("modal-img");
const caption = document.getElementById("caption");
modal.style.display = "block";
modalImg.src = this.src;
modalImg.alt = this.alt;
caption.innerText = this.alt;
const span = document.getElementsByClassName("close")[0];
span.onclick = function () {
history.pushState(null, null, "/");
modal.style.display = "none";
};
};
});
})();
</script>
</body>
</html>
`;
const UploadPage = (files: string[]) => `
<!DOCTYPE html>
<html lang="ja">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>images.iamtakagi.net / 画像ファイルをアップロードする</title>
<meta property="description" content="画像配信サーバ" />
<meta property="og:title" content="images.iamtakagi.net / 画像ファイルをアップロードする" />
<meta
property="og:description"
content="画像配信サーバ"
/>
<style>
h1 {
font-size: 1.3rem;
}
h2 {
font-size: 1.2rem;
}
h3 {
font-size: 1.1rem;
}
img {
max-width: 200px;
cursor:pointer;
transition:0.3s;
display: block;
}
img:hover {opacity: 0.7;}
.modal {
display: none; /* Hidden by default */
position: fixed; /* Stay in place */
z-index: 1; /* Sit on top */
padding-top: 100px; /* Location of the box */
left: 0;
top: 0;
width: 100%; /* Full width */
height: 100%; /* Full height */
overflow: auto; /* Enable scroll if needed */
background-color: rgb(0,0,0); /* Fallback color */
background-color: rgba(0,0,0,0.9); /* Black w/ opacity */
}
.modal-content {
margin: auto;
display: block;
width: 80%;
max-width: 700px;
}
#caption {
margin: auto;
display: block;
width: 80%;
max-width: 700px;
text-align: center;
color: #ccc;
padding: 10px 0;
height: 150px;
}
/* Add Animation - Zoom in the Modal */
.modal-content, #caption {
animation-name: zoom;
animation-duration: 0.6s;
}
@keyframes zoom {
from {transform:scale(0)}
to {transform:scale(1)}
}
/* The Close Button */
.close {
position: absolute;
top: 15px;
right: 35px;
color: #f1f1f1;
font-size: 40px;
font-weight: bold;
transition: 0.3s;
}
.close:hover,
.close:focus {
color: #bbb;
text-decoration: none;
cursor: pointer;
}
/* The Close Button */
.delete {
color: red;
font-size: 40px;
font-weight: bold;
transition: 0.3s;
}
.delete:hover,
.delete:focus {
opacity: 0.5;
text-decoration: none;
cursor: pointer;
}
/* 100% Image Width on Smaller Screens */
@media only screen and (max-width: 700px){
.modal-content {
width: 100%;
}
}
img:hover {opacity: 0.7;}
</style>
</head>
<body>
<header style="display:flex;flex-direction:column;">
<section style="margin-bottom:1rem;">
<h1 style="margin:0;">画像配信サーバ</h1>
<p style="margin:0;">画像置き場 (?)</p>
</section>
<span>画像ファイル数: ${files.length}</span>
<nav style="display:flex;flex-direction:column;">
<a href="/">インデックスに戻る</a>
<a href="/upload">画像ファイルをアップロードする (管理者用)</a>
<a href="/delete">画像ファイルを削除する (管理者用)</a>
<a href="/url2image">URL を介してサーバで直接ダウンロードする (管理者用)</a>
</nav>
</header>
<hr style="margin-top: 1.2rem; margin-bottom: 1.2rem" />
<main>
<section>
<h2>画像ファイルをアップロードする (管理者用)</h2>
<form action="/upload" method="POST" enctype="multipart/form-data" style="display:flex;flex-direction:column;">
<div id="preview" style="display:flex; flex-wrap: wrap;"></div>
<label for="file">アップロードする画像ファイル選択してください (4つまで選択可)</label>
<input
type="file"
multiple="multiple"
accept="image/*"
name="images"
id="file"
/>
<span>サポートされているファイル形式: ${ALLOWED_FORMATS}</span>
<button id="clear" type="button">クリア</button>
<button type="submit">アップロード</button>
</form>
</section>
<div id="modal" class="modal">
<span class="close">×</span>
<img class="modal-content" id="modal-img">
<div id="caption"></div>
</div>
</main>
<hr style="margin-top: 1.2rem" />
<footer style="display: flex; flex-direction: column">
<span>
GitHub:
<a href="https://github.com/iamtakagi/images">
https://github.com/iamtakagi/images
</a>
</span>
<span>
Author: <a href="https://github.com/iamtakagi">iamtakagi</a>
</span>
<span>© iamtakagi.net</span>
</footer>
<script type="text/javascript">
(() => {
document.getElementById("file").value = "";
document.getElementById("preview").innerHTML = "";
document.getElementById("clear").addEventListener("click", () => {
document.getElementById("file").value = "";
document.getElementById("preview").innerHTML = "";
});
function previewImage (file) {
const reader = new FileReader();
const preview = document.getElementById("preview");
reader.onload = function (e) {
const imageUrl = e.target.result; // 画像のURLはevent.target.resultで呼び出せる
const imgWrapper = document.createElement("div");
imgWrapper.setAttribute("id", file.name);
imgWrapper.style.display = "flex";
imgWrapper.style.flexDirection = "column";
const detailsWrapper = document.createElement("div");
detailsWrapper.style.display = "inline-flex";
detailsWrapper.style.justifyContent = "space-between";
const imgDesc = document.createElement("span");
imgDesc.innerText = file.name;
imgDesc.style.fontSize = ".8rem";
const del = document.createElement("span");
del.style.fontSize = ".8rem";
del.innerText = "削除";
del.setAttribute("class", "delete");
// ファイル選択から指定されたインデックスのファイルを削除する
function removeFileFromFileList(index) {
const dt = new DataTransfer()
const input = document.getElementById('file')
const { files } = input;
for (let i = 0; i < files.length; i++) {
const file = files[i]
if (index !== i)
dt.items.add(file);
}
input.files = dt.files // 更新
}
del.onclick = function () {
const files = document.getElementById("file").files
for (let i = 0; i < files.length; i ++) {
console.log(files);
console.log(files[i]);
console.log(file.name);
if(file.name === files[i].name) {
removeFileFromFileList(i)
document.getElementById(file.name).remove();
}
}
};
const img = document.createElement("img"); // img要素を作成
img.onclick = function () {
const modal = document.getElementById("modal");
const modalImg = document.getElementById("modal-img");
const caption = document.getElementById("caption");
modal.style.display = "block";
modalImg.src = this.src;
modalImg.alt = this.alt;
caption.innerText = this.alt;
const span = document.getElementsByClassName("close")[0];
span.onclick = function () {
modal.style.display = "none";
};