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app.ts
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app.ts
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import Koa from "koa";
import Router from "@koa/router";
import { KoaResponsiveImageRouter } from "../src/index";
import { paths, imageRouterConfig } from "./config";
const app = new Koa();
const router = new Router();
const imageRouter = new KoaResponsiveImageRouter({
staticPath: paths.staticImages,
thumbnailSize: imageRouterConfig.thumbnailsSize,
cacheManagerResolutionThreshold:
imageRouterConfig.cacheManagerResolutionThreshold,
});
async function startApp(): Promise<void> {
await imageRouter.start();
function generateNavbar(currentPage: string): string {
const navLinks = [
{
text: "Sizes Example",
path: "/",
isActive: currentPage === "sizes",
},
{
text: "Ratios Example",
path: "/ratios",
isActive: currentPage === "ratios",
},
{
text: "Queue Test",
path: "/queue",
isActive: currentPage === "queue",
},
{
text: "Object-fit-sizing example",
path: "/object-fit-sizing",
isActive: currentPage === "object-fit-sizing",
},
{
text: "Smartcrop example",
path: "/smartcrop",
isActive: currentPage === "smartcrop",
},
{
text: "Resolution filter example",
path: "/res-filter",
isActive: currentPage === "res-filter",
},
{
text: "Thumbnails example",
path: "/thumbnails",
isActive: currentPage === "thumbnails",
},
];
let navbarHTML = "<nav><ul>";
navLinks.forEach((link) => {
if (!link.isActive) {
navbarHTML += `<li><a href="${link.path}">${link.text}</a></li>`;
}
});
navbarHTML += "</ul></nav>";
return navbarHTML;
}
router.get("/", async (ctx) => {
const currentPage = "sizes";
const navbarHTML = generateNavbar(currentPage);
ctx.body = `
${navbarHTML}
${await imageRouter.image({
sizesAttr: `
(min-width: 600px) 80vw,
(min-width: 400px) 90vw,
100vw`,
path: paths.exampleImg,
thumbnailSize: 100,
})} ${await imageRouter.image({
sizesAttr: `
(max-width: 300px) 100vw,
(max-width: 600px) 80vw,
(max-width: 900px) 50vw,
900px`,
path: paths.exampleImg,
})}${await imageRouter.image({
resolutions: [100, 500, 1000, 1500],
sizesAttr: "(max-width: 900px) 100vw, 900px",
path: paths.exampleImg,
})} ${await imageRouter.image({
resolutions: [2000, 3000, 1000, 6000],
sizesAttr: "(max-width: 900px) 100vw, 900px",
path: paths.exampleImg,
})}`;
});
const ratios_path = `${paths.inputDir}/ratios`,
ratio_images_count = 5;
const getImages = async () => {
const promises = [];
for (let i = 1; i <= ratio_images_count; i++) {
const path = `${ratios_path}/${i}.jpg`;
promises.push(
imageRouter.image({
sizesAttr: `50vw`,
path,
})
);
}
const imagesArray = await Promise.all(promises);
const images = imagesArray.join("");
return images;
};
router.get("/thumbnails", async (ctx) => {
const currentPage = "thumbnails";
const navbarHTML = generateNavbar(currentPage);
ctx.body = `
${navbarHTML}
${await imageRouter.image({
resolutions: [200, 500, 1000, 1500],
sizesAttr: "(max-width: 200px) 100vw, 200px",
path: paths.exampleImg,
lazy: false,
imgStyle: "width: 200px; height: auto",
thumbnailSize: 20,
})}
${await imageRouter.image({
resolutions: [600, 1000, 1500, 2000],
sizesAttr: "(max-width: 600px) 100vw, 600px",
path: paths.exampleImg,
lazy: false,
imgStyle: "width: 600px; height: auto",
thumbnailSize: 10,
})}
${await imageRouter.image({
resolutions: [2000, 3000, 1000, 6000],
sizesAttr: "(max-width: 800px) 100vw, 800px",
path: paths.exampleImg,
lazy: false,
imgStyle: "width: 800px; height: auto",
thumbnailSize: 1,
})}
`;
});
router.get("/ratios", async (ctx) => {
const currentPage = "ratios";
const navbarHTML = generateNavbar(currentPage);
ctx.body = `
${navbarHTML}
${await getImages()}
`;
});
router.get("/smartcrop", async (ctx) => {
const currentPage = "smartcrop";
const navbarHTML = generateNavbar(currentPage);
ctx.body = `
${navbarHTML}
${await imageRouter.image({
resolutions: [600, 1000, 1500, 2000],
sizesAttr: "(max-width: 600) 100vw, 600px",
path: paths.exampleSmartCropImg,
lazy: false,
imgStyle: "width: 600px; height: auto",
crop: { width: 600, height: 600 },
})}
${await imageRouter.image({
resolutions: [600, 1000, 1500, 2000],
sizesAttr: "(max-width: 600) 100vw, 605px",
path: paths.exampleSmartCropImg,
lazy: false,
imgStyle: "width: 600px; height: auto",
crop: { width: 200, height: 200 },
})}
${await imageRouter.image({
resolutions: [600, 1000, 1500, 2000],
sizesAttr: "(max-width: 600) 100vw, 602px",
path: paths.exampleSmartCropImg,
lazy: false,
imgStyle: "width: 600px; height: auto",
crop: { width: 150, height: 300 },
})}
${await imageRouter.image({
resolutions: [600, 1000, 1500, 2000],
sizesAttr: "(max-width: 600px) 100vw, 600px",
path: paths.exampleSmartCropImg,
lazy: false,
imgStyle: "width: 600px; height: auto",
crop: { width: 2592, height: 3456, x: 2592, y: 0 },
})}
${await imageRouter.image({
resolutions: [600, 1000, 1500, 2000],
sizesAttr: "(max-width: 600) 100vw, 600px",
path: paths.exampleSmartCropImg,
lazy: false,
imgStyle: "width: 600px; height: auto",
})}
`;
});
router.get("/queue", async (ctx) => {
const currentPage = "queue";
const navbarHTML = generateNavbar(currentPage);
const imageOptions = {
resolutions: [600, 1000, 1500, 2000],
sizesAttr: "(max-width: 3000) 100vw, 3000px",
path: paths.exampleImg,
lazy: false,
imgStyle: "width: 50px; height: auto",
alt: "image",
};
const promises = [];
for (let i = 1; i <= 100; i++) {
promises.push(
imageRouter.image({
...imageOptions,
sizesAttr: "2000" + (i as unknown as string) + "w",
resolutions: [2000 + i],
})
);
}
const imagesArray = await Promise.all(promises);
const images = imagesArray.join("");
ctx.body = `
${navbarHTML}
${images}
`;
});
router.get("/res-filter", async (ctx) => {
const currentPage = "res-filter";
const navbarHTML = generateNavbar(currentPage);
ctx.body = `
${navbarHTML}w
<p><b>max-res: 5820</b></p>
${await imageRouter.image({
resolutions: [
600, 1000, 2000, 3000, 4000, 5000, 5500, 5820, 5821, 6000, 6500,
8000,
],
sizesAttr: "(max-width: 600) 100vw, 600px",
path: paths.exampleImg,
lazy: false,
imgStyle: "width: 600px; height: auto",
})}
${await imageRouter.image({
resolutions: [600, 1000, 5500, 6000, 6500, 8000],
sizesAttr: "(max-width: 600) 100vw, 600px",
path: paths.exampleImg,
lazy: false,
imgStyle: "width: 600px; height: auto",
})}`;
});
router.get("/object-fit-sizing", async (ctx) => {
const currentPage = "object-fit-sizing";
const navbarHTML = generateNavbar(currentPage);
const object_width = 500;
const resolutions: number[] = [];
for (let step = 1; step <= 100; step++) {
resolutions.push(object_width * (step * 0.1));
}
ctx.body = `
${navbarHTML}
<h2>Default Image (Cover)</h2>
${await imageRouter.image({
resolutions: resolutions,
sizesAttr: `${object_width}px`,
path: paths.exampleImg,
lazy: false,
imgStyle: "width: 500px; height: auto",
})}
<h2>Container with 'cover' Object Fit</h2>
${await imageRouter.image({
resolutions: resolutions,
path: paths.exampleImg,
lazy: false,
imgStyle: "width: 500px; height: 500px;",
container: {
objectFit: "cover",
width: object_width,
height: object_width,
},
})}
<h2>Container with 'contain' Object Fit</h2>
${await imageRouter.image({
resolutions: resolutions,
path: paths.exampleImg,
lazy: false,
imgStyle: "width: 500px; height: 500px;",
container: {
objectFit: "contain",
width: object_width,
height: object_width,
},
})}
`;
});
}
void startApp()
.catch((error) => {
console.error("An error occurred:", error);
throw error;
})
.then(() => {
console.log("APP STARTED");
});
router.use(paths.staticImages, imageRouter.getRoutes());
app.use(router.routes()).use(router.allowedMethods()).listen(3005);
console.log("Demo running on http://localhost:3005");

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