Add verification functions

.gitignore

@@ -2,7 +2,6 @@
 /_site/
 .netlify/
 
-
 ## Generic files to ignore
 *~
 *.DS_Store
@@ -33,6 +32,7 @@ codekit-config.json
 dwsync.xml
 node_modules
 npm-debug.log
+.vscode/
 
 
 ## Compiled source

functions/common/errors.js

@@ -0,0 +1,19 @@
+export class UnverifiedHostnameError extends Error {
+    constructor(message, hostname, args) {
+        super(`${message}: ${JSON.stringify({
+            hostname,
+            ...args
+        }, null, 2)}`)
+
+        Error.captureStackTrace(this, UnverifiedHostnameError)
+    }
+}
+
+export class RedirectError extends Error {
+    constructor(message, metadata = null) {
+        const msg = (metadata) ? `${message}: ${JSON.stringify(metadata, null, 2)}` : message
+        super(msg)
+
+        Error.captureStackTrace(this, RedirectError)
+    }
+}

functions/verify.mjs

@@ -0,0 +1,40 @@
+import fetch from 'node-fetch'
+import members from '../data/members'
+import {RedirectError} from './common/errors'
+
+members.push({
+    url: 'https://httpbin.org/status/302'
+})
+
+export const handler = async (event, context) => {
+    const errors = []
+
+    for (const member of members) {
+        const url = member.url
+
+        try {
+            const res = await fetch(url, {
+                redirect: 'manual'
+            })
+
+            if (!res.ok) {
+                // TODO: figure out what to do to remove the URL from the webring
+                errors.push(new RedirectError(`did not receive a 2xx response from ${url}`, {
+                    status: res.status,
+                    statusText: res.statusText,
+                    headers: res.headers.raw()
+                }))
+            }
+        } catch (err) {
+            errors.push(err)
+        }
+    }
+
+    if (errors.length > 0) {
+        errors.forEach((e) => console.log(e))
+    }
+
+    return {
+        statusCode: 200,
+    }
+}

functions/verifyDNS.mjs

@@ -0,0 +1,50 @@
+import {Resolver} from 'node:dns/promises'
+import members from '../data/members'
+import {UnverifiedHostnameError} from './common/errors'
+
+const TXTPREFIX = 'a11y-webring-club-verification'
+
+const resolver = new Resolver()
+
+export const handler = async (event, context) => {
+    const errors = []
+
+    for (const member of members) {
+        // if we haven't defined a key for a member we won't verify
+        if (!('key' in member)) {
+            continue
+        }
+
+        const url = new URL(member.url)
+
+        try {
+            const res = await resolver.resolveTxt(url.hostname)
+
+            res.flat().forEach((el) => {
+                if (!el.startsWith(TXTPREFIX)) {
+                    return
+                }
+
+                const key = el.split('=').pop()
+                if (key !== member.key) {
+                    // TODO: figure out what to do to remove the URL from the webring
+                    errors.push(new UnverifiedHostnameError(`could not verify: ${member.url}`, url.hostname, {
+                        memberKey: member.key,
+                        providedKey: key,
+                        dnsRecords: res.flat()
+                    }))
+                }
+            })
+        } catch (err) {
+            errors.push(new UnverifiedHostnameError(err, url.hostname))
+        }
+    }
+
+    if (errors.length > 0) {
+        errors.forEach((e) => console.log(e))
+    }
+
+    return {
+        statusCode: 200,
+    }
+}

netlify.toml

@@ -6,6 +6,12 @@
 [functions]
   directory = "functions"
 
+[functions."verify"]
+schedule = "@daily"
+
+[functions."verifyDNS"]
+schedule = "@weekly
+
 [[headers]]
     for = "/*"
     [headers.values]