Profiles and Media

Goal

This snapshot advances Baltic Post by teaching you to show author profiles and accept constrained avatar uploads.

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

Upload endpoints must check type and size and store safe filenames.

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

Walkthrough

Protect profile editing and serve uploads.

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

if (contentType !in listOf(ContentType.Image.JPEG, ContentType.Image.PNG)) call.respond(HttpStatusCode.BadRequest)

Run and verify

Enter 08-Profiles-And-Media, 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/08-Profiles-And-Media
cp .env.example .env
./gradlew run

Troubleshooting

Confirm multipart enctype and field name.

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

Upload a valid image, then reject a text file.

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