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Profiles and Media

Show profiles and accept constrained avatar uploads.

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

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