set up lambda endpoints

lambda/common/utils.js

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+import meta from '../src/data/meta'
+import members from '../src/data/members'
+
+export const redirect = site => {
+    const location = site && site.url ? site.url : meta.url
+    return {
+        statusCode: 302,
+        headers: {
+            Location: location,
+            'Cache-Control': 'no-cache, no-store, must-revalidate'
+        },
+        body: `Redirecting to "${site.title}"`
+    }
+}
+
+export const getIndex = url => members.findIndex(site => site.url.includes(url))
+
+export const getNext = url => {
+    const index = getIndex(url)
+    if (index !== -1) {
+        const nextIndex = index < members.length - 1 ? index + 1 : 0
+        return members[nextIndex]
+    }
+    return null
+}
+
+export const getPrevious = url => {
+    const index = getIndex(url)
+    if (index !== -1) {
+        const prevIndex = index > 0 ? index - 1 : members.length - 1
+        return members[prevIndex]
+    }
+    return null
+}
+
+export const getRandom = url => {
+    const randomIndex = Math.floor(Math.random() * members.length)
+    const filtered = members.filter(site => !site.url.includes(url))
+    return filtered[randomIndex]
+}

lambda/next.js

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+import { redirect, getNext } from './common/utils'
+
+exports.handler = function(event, context, callback) {
+    const { host } = event.headers
+    const next = getNext(host)
+
+    callback(null, redirect(next))
+}

lambda/prev.js

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+import { redirect, getPrevious } from './common/utils'
+
+exports.handler = function(event, context, callback) {
+    const { host } = event.headers
+    const prev = getPrevious(host)
+
+    callback(null, redirect(prev))
+}

lambda/random.js

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+import { redirect, getRandom } from './common/utils'
+
+exports.handler = function(event, context, callback) {
+    const { host } = event.headers
+    const random = getRandom(host)
+
+    callback(null, redirect(random))
+}