PrestaProxy

Go reverse proxy in front of PrestaShop 1.7.3 with:

• Echo as the HTTP server
• native Go PrestaShop cookie decode/encode
• templ for HTML rendering
• Bun for JS and Tailwind builds
• GORM with SQLite for app-local state

Current scope

• Go owns GET /product/:slug
• all other routes proxy to the upstream PrestaShop instance
• product data, customer data, and cart summary are read from the PrestaShop database
• session state is derived from the live PrestaShop cookie

Requirements

• Go
• Bun
• templ
• access to the PrestaShop database
• PrestaShop cookie key, or access to the PrestaShop install root

Configuration

The service now loads .env automatically from the project root at startup.

Important variables:

• PRESTASHOP_PROXY_TARGET: upstream PrestaShop origin, required
• DOMAIN_COOKIE: optional domain override used when deriving the hashed PrestaShop-... cookie name
• PRESTASHOP_COOKIE_NAME: optional explicit cookie-name override. If omitted, the app derives the standard PrestaShop-... name from PrestaShop version and normalized host, and still falls back to prefix matching on reads.
• PRESTASHOP_COOKIE_KEY: Defuse/PrestaShop cookie key, required unless bootstrap from install root is used
• DB_USER, DB_PASS, DB_NAME, DB_HOST, DB_PORT: preferred split MariaDB settings
• DB_PREFIX: PrestaShop table prefix
• PRESTASHOP_DB_DSN: optional full DSN override
• PRESTASHOP_PROJECT_ROOT: optional path to an existing PrestaShop install for bootstrap
• ROUTE_OWNERSHIP_CONFIG: route prefix currently handled by Go

Example MariaDB setup:

PRESTASHOP_PROXY_TARGET=http://localhost
PRESTASHOP_COOKIE_KEY=def00000...
PRESTASHOP_DB_DIALECT=mariadb
DB_USER=presta
DB_PASS=presta
DB_NAME=presta
DB_PREFIX=ps_
DB_HOST=mariadb
DB_PORT=3306

If PRESTASHOP_DB_DSN is set, it takes precedence over the split DB settings.

Install

bun install
templ generate
go mod tidy

Build assets

bun run build

Available Bun scripts:

• bun run build:js
• bun run build:css
• bun run build:manifest
• bun run build
• bun run dev

Run

go run ./cmd/proxy

Default listen address is :8080.

Health endpoints

• GET /healthz
• GET /readyz

Debug endpoint

• GET|POST /debug/cookie/decode

Pass a cookie explicitly with value or cookie, for example:

curl "http://localhost:8080/debug/cookie/decode?value=def50200..."

If no parameter is provided, the endpoint returns the cookie already decoded from the incoming request session.

Cookie support

Native cookie logic lives in internal/prestashop/cookie/codec.go.

What it does now:

• decrypts live PrestaShop cookies in Go
• parses plaintext key/value fields
• re-encodes cookies in Go using the same key format

Current limitation:

• it can round-trip and re-encode cookie content, but it does not yet recompute higher-level PrestaShop semantic fields like checksum for arbitrary mutations

Tests

go test ./...