mirror of https://git.sr.ht/~cadence/bibliogram
62 lines
2.0 KiB
JavaScript
62 lines
2.0 KiB
JavaScript
const constants = require("../../lib/constants")
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const {request} = require("../../lib/utils/request")
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const {proxy} = require("pinski/plugins")
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const gm = require("gm")
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module.exports = [
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{route: "/imageproxy", methods: ["GET"], code: async (input) => {
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/** @type {URL} */
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// check url param exists
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const completeURL = input.url
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const params = completeURL.searchParams
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if (!params.get("url")) return [400, "Must supply `url` query parameter"]
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try {
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var url = new URL(params.get("url"))
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} catch (e) {
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return [400, "`url` query parameter is not a valid URL"]
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}
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// check url protocol
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if (url.protocol !== "https:") return [400, "URL protocol must be `https:`"]
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// check url host
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if (!["fbcdn.net", "cdninstagram.com"].some(host => url.host.endsWith(host))) return [400, "URL host is not allowed"]
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if (!["png", "jpg"].some(ext => url.pathname.endsWith(ext))) return [400, "URL extension is not allowed"]
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const width = +params.get("width")
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if (typeof width === "number" && !isNaN(width) && width > 0) {
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/*
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This uses graphicsmagick to force crop the image to a square.
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Some thumbnails aren't square and will be stretched on the page without this.
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If I cropped the images client side, it would have to be done with CSS background-image, which means no <img srcset>.
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*/
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return request(url).then(res => {
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const image = gm(res.body).gravity("Center").crop(width, width, 0, 0).repage("+")
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return {
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statusCode: 200,
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contentType: "image/jpeg",
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headers: {
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"Cache-Control": constants.caching.image_cache_control
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},
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stream: image.stream("jpg")
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}
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/*
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Alternative buffer-based method for sending file:
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return new Promise(resolve => {
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image.toBuffer((err, buffer) => {
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if (err) console.error(err)
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resolve({
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statusCode: 200,
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contentType: "image/jpeg",
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content: buffer
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})
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})
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})
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*/
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})
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} else {
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return proxy(url, {
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"Cache-Control": constants.caching.image_cache_control
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})
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}
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}}
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]
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