mirror of https://git.sr.ht/~cadence/bibliogram
66 lines
2.0 KiB
JavaScript
66 lines
2.0 KiB
JavaScript
/**
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* Check that a host is part of Instagram's CDN.
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* @param {string} host
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*/
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function verifyHost(host) {
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const domains = ["fbcdn.net", "cdninstagram.com"]
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return domains.some(against => host === against || host.endsWith("." + against))
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}
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/**
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* Check that a resource is on Instagram.
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* @param {URL} completeURL
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*/
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function verifyURL(completeURL) {
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const params = completeURL.searchParams
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if (!params.get("url")) return {status: "fail", value: [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 {status: "fail", value: [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 {status: "fail", value: [400, "URL protocol must be `https:`"]}
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// check url host
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if (!verifyHost(url.host)) return {status: "fail", value: [400, "URL host is not allowed"]}
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return {status: "ok", url}
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}
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function proxyImage(url, width, shortcode) {
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shortcode = shortcode ? `/${shortcode}${width ? "-small" : ""}.jpg` : ""
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const params = new URLSearchParams()
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if (width) params.set("width", width)
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params.set("url", url)
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return `/imageproxy${shortcode}?${params.toString()}`
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}
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function proxyProfilePic(url, userID) {
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const params = new URLSearchParams()
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params.set("userID", userID)
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params.set("url", url)
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return "/imageproxy?"+params.toString()
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}
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function proxyVideo(url, shortcode) {
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shortcode = shortcode ? `/${shortcode}.mp4` : ""
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const params = new URLSearchParams()
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params.set("url", url)
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return `/videoproxy${shortcode}?${params.toString()}`
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}
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/**
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* @param {import("../types").ExtendedOwner} owner
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*/
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function proxyExtendedOwner(owner) {
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const clone = {...owner}
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clone.profile_pic_url = proxyProfilePic(clone.profile_pic_url, clone.id)
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return clone
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}
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module.exports.proxyImage = proxyImage
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module.exports.proxyProfilePic = proxyProfilePic
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module.exports.proxyVideo = proxyVideo
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module.exports.proxyExtendedOwner = proxyExtendedOwner
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module.exports.verifyHost = verifyHost
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module.exports.verifyURL = verifyURL
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