Add subscription feature

.env.example

@@ -13,4 +13,8 @@ AUTH_SECRET=
 AUTH_TRUST_HOST=
 AUTH_REDIRECT_PROXY_URL=
 NTFY_URL=
-NTFY_TOKEN=
+NTFY_TOKEN=
+LISTMONK_URL=
+LISTMONK_LIST_ID=
+LISTMONK_USERNAME=
+LISTMONK_TOKEN=

.gitignore

@@ -3,6 +3,8 @@ prisma/**/*
 !prisma/schema.prisma
 .env
 
+encrypt_secrets.sh
+
 supabase/
 !/lib/supabase
 

app/actions/subscribe.ts

@@ -0,0 +1,32 @@
+'use server'
+
+import {z} from 'zod'
+import {addSubscriber} from '@/lib/listmonk'
+
+export async function subscribe(prevState: { message: string }, formData: FormData) {
+    const schema = z.object({
+        email: z.string().email()
+    })
+
+    const {email} = {
+        email: formData.get('email')
+    }
+
+    const parse = schema.safeParse({email})
+    if (!parse.success) {
+        return {message: 'Error, your email address is invalid.'}
+    }
+
+    try {
+        await addSubscriber(email)
+    } catch (error) {
+        let errorMessage
+        if (error instanceof Error) errorMessage = error.message
+        else errorMessage = String(error)
+
+        console.error(error)
+        return {message: errorMessage}
+    }
+
+    return {message: 'Subscribed'}
+}

components/layouts/ArticleLayout.tsx

@@ -6,6 +6,7 @@ import {Views} from '@/components/ui/Views'
 import {ArrowDownIcon} from '@/components/icons/ArrowDownIcon'
 import ArticleNav from '@/components/ui/ArticleNav'
 import {Comments} from '@/components/ui/Comments'
+import {Subscribe} from '@/components/ui/Subscribe'
 import {getAllArticles} from '@/lib/getAllArticles'
 import {getComments} from '@/lib/getComments'
 import {format} from 'date-fns'
@@ -83,6 +84,7 @@ export async function ArticleLayout({
                         </header>
                         <Prose className="mt-8" data-mdx-content>{children}</Prose>
                     </article>
+                    <Subscribe/>
                     <Comments slug={slug} comments={comments}/>
                     <ArticleNav prev={prev} next={next}/>
                 </div>

components/ui/StatusMessage.tsx

@@ -6,11 +6,12 @@ import {CrossIcon} from '@/components/icons/CrossIcon'
 type StatusMessageProps = {
     children: ReactNode
     className?: string
+    errorConditions?: string[]
 }
 
-export function StatusMessage({children, className}: StatusMessageProps) {
-    const errorConditions = ['error', 'problem']
-    const isError = errorConditions.some(condition => children?.toString().toLowerCase().includes(condition))
+export function StatusMessage({children, className, errorConditions}: StatusMessageProps) {
+    const _errorConditions = ['error', 'problem', ...errorConditions ?? []]
+    const isError = _errorConditions.some(condition => children?.toString().toLowerCase().includes(condition))
 
     return (
         <>

components/ui/Subscribe.tsx

@@ -0,0 +1,50 @@
+'use client'
+
+import React, {useActionState} from 'react'
+import {Button} from '@/components/ui/Button'
+import {InboxIcon} from '@/components/icons/InboxIcon'
+import {subscribe} from '@/app/actions/subscribe'
+import {StatusMessage} from '@/components/ui/StatusMessage'
+
+type InitialState = {
+    message: string
+}
+
+const initialState: InitialState = {
+    message: ''
+}
+
+export function Subscribe() {
+    const [state, formAction, pending] = useActionState(subscribe, initialState)
+
+    const handleKeyDown = (e: React.KeyboardEvent<HTMLInputElement>) => {
+        if ((e.ctrlKey || e.metaKey) && (e.key === 'Enter' || e.key === 'NumpadEnter')) {
+            e.preventDefault()
+            e.currentTarget.form?.requestSubmit()
+        }
+    }
+
+    return (
+        <div className="mt-24 rounded-2xl p-px dark:bg-gradient-to-r dark:from-pink-500 dark:via-red-500 dark:to-yellow-500">
+            <div className="rounded-2xl border border-zinc-100 p-6 dark:border-zinc-700/40 bg-white dark:bg-gray-950">
+                <h2 className="flex items-center text-base font-semibold text-zinc-900 dark:text-zinc-100">
+                    <InboxIcon className="size-6"/>
+                    <span className="ml-3">Stay in the loop</span>
+                </h2>
+                <p className="mt-2 text-base text-zinc-600 dark:text-gray-400">
+                    Subscribe to my newsletter and get notified when I publish more content like this.
+                </p>
+                <form className="mt-6 flex flex-col sm:flex-row gap-x-2"
+                      action={formAction}>
+                    <input type="email" name="email" id="email" required onKeyDown={handleKeyDown}
+                           placeholder="Your email address"
+                           className="rounded-md px-3 py-1.5 text-base text-zinc-600 dark:text-zinc-400 bg-[#fafafa] dark:bg-[#121212] border-[1px] dark:border-zinc-700/40 -outline-offset-1 focus:outline focus:outline-2 focus:-outline-offset-2 focus:outline-indigo-600 focus:dark:outline-indigo-600"/>
+                    <Button variant="secondary" className="mt-2 sm:mt-0" disabled={pending}>
+                        Subscribe
+                    </Button>
+                    <StatusMessage className="mt-2 sm:mt-0 sm:ml-2" errorConditions={['already']}>{state?.message}</StatusMessage>
+                </form>
+            </div>
+        </div>
+    )
+}

lib/listmonk.ts

@@ -0,0 +1,28 @@
+const LISTMONK_URL = process.env.LISTMONK_URL ?? ''
+const LISTMONK_LIST_ID = process.env.LISTMONK_LIST_ID ?? ''
+const LISTMONK_USERNAME = process.env.LISTMONK_USERNAME ?? ''
+const LISTMONK_TOKEN = process.env.LISTMONK_TOKEN ?? ''
+
+export async function addSubscriber(email: FormDataEntryValue | null) {
+    if (email !== null && LISTMONK_URL !== '') {
+        const headers = new Headers()
+        headers.append('Content-Type', 'application/json')
+        headers.append('Authorization', 'Basic ' + Buffer.from(LISTMONK_USERNAME + ':' + LISTMONK_TOKEN).toString('base64'))
+
+        const response = await fetch(LISTMONK_URL, {
+            method: 'POST',
+            headers: headers,
+            body: JSON.stringify({
+                email: email,
+                lists: [parseInt(LISTMONK_LIST_ID)],
+                preconfirm_subscriptions: true
+            })
+        })
+
+        if (response.status === 409) {
+            throw new Error('Already subscribed')
+        } else if (response.status !== 200) {
+            throw new Error('Server error')
+        }
+    }
+}