Profiles and Media

Goal

This snapshot advances Mossbank Post by teaching you to show 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 Go 1.22+, and Docker for Postgres stages.

Port 8083 must be free. Copy .env.example before starting database stages.

• Go toolchain
• 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: templates present data, handlers enforce rules, and html/template escapes 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 != "image/jpeg" && contentType != "image/png" && contentType != "image/webp" {
  c.String(400, "bad type"); return
}

Run and verify

Enter 08-Profiles-And-Media, copy .env.example, and start Gin on port 8083.

Open http://127.0.0.1:8083. Watch the terminal for validation and database errors.

docker compose up -d
git clone https://github.com/michaeldunga1/fcc-gin-blog.git
cd fcc-gin-blog/08-Profiles-And-Media
cp .env.example .env
go run .

Troubleshooting

Confirm multipart form field name.

For database failures, confirm Docker and the mossbank_NN name. Never commit .env.

• 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