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*/node_modules | ||
package-lock.json | ||
.DS_Store | ||
*.zip |
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MIT License | ||
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Copyright (c) 2024 Mike Neverov | ||
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Permission is hereby granted, free of charge, to any person obtaining a copy | ||
of this software and associated documentation files (the "Software"), to deal | ||
in the Software without restriction, including without limitation the rights | ||
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
copies of the Software, and to permit persons to whom the Software is | ||
furnished to do so, subject to the following conditions: | ||
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The above copyright notice and this permission notice shall be included in all | ||
copies or substantial portions of the Software. | ||
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | ||
SOFTWARE. |
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![Cover Image](assets/cover.svg) | ||
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This is a simple serverless application that uses AWS Lambda, Stripe and Brevo to deliver files to customers after they have made a payment via your Stripe Payment Link. | ||
Because Themeforest, Gumroad and KoFi may be nice, but why not manage your own payment links and have a straight-forward user experience? | ||
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## Demo | ||
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TODO: Insert GitHub Video | ||
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## In-depth guide | ||
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You can read a detailed guide on setting this up in [my blog](neveroff.dev/blog/download-file-stripe-payment-link/). | ||
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## Getting started without the guide | ||
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1. Check out the repository into a local folder, open the terminal at the root folder. | ||
2. Do `cd email-delivery` followed by `npm install && zip -r ../email-delivery.zip .` and then `cd ../file-delivery` followed by `npm install && zip -r ../file-delivery.zip .`. This will generate the node_modules folders necessary for Lambdas to work. | ||
3. Go to the AWS Console and create a new Lambda function for each of the zipped folders, using the `index.mjs` as the handler. | ||
4. Configure the Environment and Stage variables as per the `index.mjs` files in both file and email delivery folders. | ||
5. Configure the Stripe Payment Link to point to the API Gateway URL for the `file-delivery` Lambda. | ||
6. Configure a new Stripe Webhook on the `checkout.session.completed` event to point to the API Gateway URL for the `email-delivery` Lambda. | ||
7. Use the Stripe Test mode to ensure that your customer path is working as expected and an email is sent out with the file download link. | ||
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## License | ||
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This project is licensed under the MIT License - see the [LICENSE](LICENSE.md) file for details. |
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import axios from 'axios'; | ||
import stripe from 'stripe'; | ||
import AWS from 'aws-sdk'; | ||
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const s3 = new AWS.S3(); | ||
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export const handler = async (event) => { | ||
const body = event.body; | ||
const signature = event.headers['Stripe-Signature']; | ||
const endpointSecret = event.stageVariables.stripe_endpoint_secret_key; | ||
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let stripeEvent; | ||
let recipientEmail; | ||
let redirectUrl; | ||
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try { | ||
stripeEvent = stripe.webhooks.constructEvent(body, signature, endpointSecret); | ||
} catch (err) { | ||
console.log(`Webhook signature verification failed.`, err.message); | ||
return { | ||
statusCode: 400, | ||
body: `Webhook Error: ${err.message}` | ||
}; | ||
} | ||
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if (stripeEvent.type === 'checkout.session.completed') { | ||
const session = stripeEvent.data.object; | ||
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if (session.payment_status === 'paid') { | ||
recipientEmail = session.customer_details.email; | ||
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if (!recipientEmail) { | ||
recipientEmail = process.env.fallback_email; | ||
} | ||
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const params = { | ||
Bucket: process.env.bucket_name, | ||
Key: process.env.object_key, | ||
Expires: 60 * 60 * 24 * 30 // 30 days | ||
}; | ||
const presignedUrl = s3.getSignedUrl('getObject', params); | ||
redirectUrl = `${process.env.redirect_host}${encodeURIComponent(presignedUrl)}${process.env.utm_parameters}`; | ||
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const emailBody = { | ||
templateId: 1, | ||
to: [{ email: recipientEmail }], // use the email from the webhook | ||
params: { downloadURL: redirectUrl } | ||
}; | ||
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try { | ||
await axios.post('https://api.sendinblue.com/v3/smtp/email', emailBody, { | ||
headers: { | ||
'accept': 'application/json', | ||
'content-type': 'application/json', | ||
'api-key': event.stageVariables.brevo_api_key | ||
} | ||
}); | ||
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console.log(`Email sent for session id ${session.id}`); | ||
} catch (err) { | ||
console.log(`Failed to send email for session id ${session.id}`, err); | ||
} | ||
} | ||
else { | ||
console.log(`Payment status is different from paid: ${session.payment_status}.`); | ||
return { | ||
statusCode: 400, | ||
body: `Received ${stripeEvent.type}, payment status is different from paid: ${session.payment_status}, handled by ${event.stageVariables.environment} env.` | ||
}; | ||
} | ||
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} else { | ||
console.log(`Unhandled event type ${stripeEvent.type}.`); | ||
} | ||
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return { | ||
statusCode: 200, | ||
body: `Received ${stripeEvent.type}, sent an email to ${recipientEmail} with a redirect link ${redirectUrl} handled by ${event.stageVariables.environment} env.` | ||
}; | ||
}; |
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{ | ||
"dependencies": { | ||
"aws-sdk": "^2.1563.0", | ||
"axios": "^1.6.7", | ||
"stripe": "^14.17.0" | ||
} | ||
} |
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import Stripe from 'stripe'; | ||
import AWS from 'aws-sdk'; | ||
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const s3 = new AWS.S3(); | ||
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export const handler = async (event) => { | ||
const stripe = new Stripe(event.stageVariables.stripe_secret_api_key); | ||
const sessionId = event.queryStringParameters.sessionId; | ||
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let chargeSucceeded = false; | ||
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for (let i = 0; i < 10; i++) { | ||
try { | ||
const session = await stripe.checkout.sessions.retrieve(sessionId); | ||
if (session.payment_status === 'paid') { | ||
chargeSucceeded = true; | ||
break; | ||
} | ||
} catch (error) { | ||
console.error(`Failed to retrieve session: ${error.message}. Environment: ${event.stageVariables.environment}.`); | ||
return { | ||
statusCode: 400, | ||
body: `Failed to retrieve session: ${error.message}. Environment: ${event.stageVariables.environment}.` | ||
}; | ||
} | ||
await new Promise(resolve => setTimeout(resolve, 1000)); | ||
} | ||
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if (chargeSucceeded) { | ||
const params = { | ||
Bucket: process.env.bucket_name, | ||
Key: process.env.object_key, | ||
Expires: 60 * 60 * 24 * 30 // 30 days | ||
}; | ||
const presignedUrl = s3.getSignedUrl('getObject', params); | ||
const redirectUrl = `${process.env.redirect_host}${encodeURIComponent(presignedUrl)}${process.env.utm_parameters}`; | ||
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console.log(`Redirecting to ${redirectUrl} in environment ${event.stageVariables.environment}.`); | ||
return { | ||
statusCode: 302, | ||
headers: { | ||
Location: redirectUrl | ||
}, | ||
body: '' | ||
}; | ||
} else { | ||
console.log(`Charge did not succeed for session id ${sessionId}. Environment: ${event.stageVariables.environment}.`); | ||
return { | ||
statusCode: 400, | ||
body: `Charge did not succeed for session id ${sessionId}. Environment: ${event.stageVariables.environment}.` | ||
}; | ||
} | ||
}; |
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{ | ||
"dependencies": { | ||
"aws-sdk": "^2.1563.0", | ||
"stripe": "^14.17.0" | ||
} | ||
} |