Registration

Goal

This snapshot advances Baltic Post by teaching you to validate accounts and store bcrypt password hashes.

Every numbered folder is a complete app. Run this stage independently, then compare it with the previous folder.

Prerequisites

Use JDK 17+, Gradle, and Docker for Postgres stages.

Port 8090 must be free. Copy .env.example before starting database stages.

• JDK 17+ and Gradle
• A code editor and terminal
• Docker from part 4 onward

Concepts

Registration normalizes email, checks uniqueness, and hashes passwords.

Keep handlers thin: routes accept input, Exposed tables enforce rules, and FreeMarker escapes output by default.

Walkthrough

Accept form POST, validate, hash, insert user.

Read the example, then open the matching snapshot. The repository includes the surrounding setup and error handling.

val hash = BCrypt.hashpw(password, BCrypt.gensalt())

Run and verify

Enter 06-Registration, run Gradle, copy .env.example, and start Ktor on port 8090.

Open http://127.0.0.1:8090. Watch the terminal for validation and database errors.

docker compose up -d
git clone https://github.com/michaeldunga1/fcc-ktor-blog.git
cd fcc-ktor-blog/06-Registration
cp .env.example .env
./gradlew run

Troubleshooting

Duplicate email should return a clear form error.

For database failures, confirm Docker and the baltic_NN name when applicable. Never commit .env or local.properties secrets.

• Read the first error first
• Restart after environment changes
• Never commit secrets

Try this

Try a short password and a duplicate email.

Test a happy path and one invalid or unauthorized request.

• Make one small change
• Test it in the browser
• Compare with the next snapshot only after it works