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feat: Introduce new Rust backend service and Nginx reverse proxy configuration.
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+121
-19
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5 files changed

+121
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‎backend/Cargo.toml‎

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@@ -36,6 +36,7 @@ unicode-normalization = "0.1"
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sha2 = "0.10"
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hmac = "0.12"
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subtle = "2.5"
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reqwest = { version = "0.11", features = ["json"] }
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[dependencies.home]
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version = "=0.5.9"

‎backend/src/handlers/frontend_proxy.rs‎

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@@ -0,0 +1,92 @@
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use axum::{
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extract::State,
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response::{Html, IntoResponse},
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};
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use reqwest::Client;
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use std::env;
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use crate::{db, models::SiteContent};
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// Default frontend URL (internal Docker network)
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const DEFAULT_FRONTEND_URL: &str = "http://frontend";
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pub async fn serve_index(State(pool): State<db::DbPool>) -> impl IntoResponse {
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let frontend_url = env::var("FRONTEND_URL").unwrap_or_else(|_| DEFAULT_FRONTEND_URL.to_string());
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let index_url = format!("{}/index.html", frontend_url);
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// Fetch index.html from frontend container
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let client = Client::new();
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let html_content = match client.get(&index_url).send().await {
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Ok(resp) => match resp.text().await {
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Ok(text) => text,
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Err(e) => {
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tracing::error!("Failed to read index.html body: {}", e);
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return Html("<h1>Internal Server Error</h1><p>Failed to load application.</p>".to_string()).into_response();
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}
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},
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Err(e) => {
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tracing::error!("Failed to fetch index.html from {}: {}", index_url, e);
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return Html("<h1>Internal Server Error</h1><p>Failed to connect to frontend service.</p>".to_string()).into_response();
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}
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};
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// Fetch site meta from DB
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let site_meta = match db::fetch_site_content_by_section(&pool, "site_meta").await {
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Ok(Some(record)) => {
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match serde_json::from_str::<serde_json::Value>(&record.content_json) {
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Ok(json) => json,
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Err(_) => serde_json::json!({}),
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}
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},
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_ => serde_json::json!({}),
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};
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let title = site_meta.get("title")
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.and_then(|v| v.as_str())
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.unwrap_or("Linux Tutorial - Lerne Linux Schritt für Schritt");
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let description = site_meta.get("description")
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.and_then(|v| v.as_str())
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.unwrap_or("Lerne Linux von Grund auf - Interaktiv, modern und praxisnah.");
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// Inject meta tags using simple string replacement
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// We target the specific default tags to replace them
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let mut injected_html = html_content;
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// Replace Title
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injected_html = injected_html.replace(
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"<title>Linux Tutorial - Lerne Linux Schritt für Schritt</title>",
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&format!("<title>{}</title>", title)
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);
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// Replace Meta Description
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// Note: This regex-like replacement is brittle if the HTML formatting changes.
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// For now, we assume the exact string from index.html or use a more robust regex if needed.
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// Since we don't have regex crate here yet, we'll try to replace the known default description.
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// If it's dynamic, we might need a more robust approach, but for now let's try replacing the known default.
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let default_desc = "Lerne Linux von Grund auf - Interaktiv, modern und praxisnah. Umfassende Tutorials für Einsteiger und Fortgeschrittene.";
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injected_html = injected_html.replace(
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&format!("content=\"{}\"", default_desc),
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&format!("content=\"{}\"", description)
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);
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// Also replace OG tags if possible.
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// A better approach for robust replacement without full HTML parsing:
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// We can replace the whole <head> block or specific known lines if we are sure about the structure.
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// Given the index.html structure, we can try to replace specific lines.
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// Replace OG Title
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injected_html = injected_html.replace(
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"content=\"Linux Tutorial - Lerne Linux Schritt für Schritt\"",
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&format!("content=\"{}\"", title)
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);
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// Replace OG Description (reusing the description replacement above might handle this if content matches)
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// The default OG description in index.html is shorter: "Lerne Linux von Grund auf - Interaktiv, modern und praxisnah."
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let default_og_desc = "Lerne Linux von Grund auf - Interaktiv, modern und praxisnah.";
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injected_html = injected_html.replace(
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&format!("content=\"{}\"", default_og_desc),
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&format!("content=\"{}\"", description)
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);
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Html(injected_html).into_response()
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}

‎backend/src/handlers/mod.rs‎

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@@ -157,3 +157,4 @@ pub mod comments; // Comment system management
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pub mod site_content; // Dynamic site content sections
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pub mod site_pages; // Static page management
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pub mod site_posts; // Blog post management
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pub mod frontend_proxy; // Frontend proxy for server-side injection

‎backend/src/main.rs‎

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@@ -519,11 +519,17 @@ async fn main() {
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.route("/api/health", get(|| async { "OK" }))
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.with_state(pool)
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.with_state(pool.clone())
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.layer(middleware::from_fn(security_headers))
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.layer(cors)
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.layer(RequestBodyLimitLayer::new(PUBLIC_BODY_LIMIT));
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// Serve index.html with server-side injection for root and fallback
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// This must be added AFTER API routes to ensure they take precedence
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app = app.route("/", get(handlers::frontend_proxy::serve_index))
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.route("/*path", get(handlers::frontend_proxy::serve_index))
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.with_state(pool);
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if !trust_proxy_ip_headers {
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app = app.layer(middleware::from_fn(strip_untrusted_forwarded_headers));
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}

‎nginx/nginx.conf‎

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@@ -189,35 +189,37 @@ server {
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# FRONTEND ROUTING CONFIGURATION
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# ========================================================================
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# Route all other requests to the frontend service
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# Route root and page requests to the backend for server-side injection
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# This allows the backend to inject dynamic meta tags into index.html
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location / {
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# Proxy to frontend upstream server
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proxy_pass http://frontend;
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# Proxy to backend upstream server
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proxy_pass http://backend;
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# Use HTTP/1.1 for consistent behavior
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proxy_http_version 1.1;
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# ====================================================================
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# PROXY HEADERS - FRONTEND REQUESTS
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# ====================================================================
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# Standard proxy headers for frontend requests
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# Standard proxy headers
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proxy_set_header Host $host;
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proxy_set_header X-Real-IP $remote_addr;
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proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
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proxy_set_header X-Forwarded-Proto $scheme;
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}
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# ====================================================================
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# FRONTEND-SPECIFIC CONFIGURATION
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# ====================================================================
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# Consider adding caching headers for static assets:
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# proxy_cache_valid 200 1h; # Cache successful responses
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# proxy_cache_key $scheme$proxy_host$request_uri;
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# Route static assets to the frontend service directly
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# This bypasses the backend for better performance on static files
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location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|json|xml|txt|map)$ {
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proxy_pass http://frontend;
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proxy_http_version 1.1;
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# Standard proxy headers
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proxy_set_header Host $host;
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proxy_set_header X-Real-IP $remote_addr;
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proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
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proxy_set_header X-Forwarded-Proto $scheme;
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# Compression support (if not handled by frontend):
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# gzip_proxied any;
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# gzip_vary on;
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# Caching headers for static assets
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expires 1y;
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add_header Cache-Control "public, immutable";
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}
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# ========================================================================

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