Initial commit

2025-07-30 12:32:14 +02:00
parent ddaa0e5f05
commit be72715cfe
8 changed files with 545 additions and 0 deletions
--- a/24
+++ b/24
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+FROM denoland/deno:alpine-1.48.0
+
+# Set working directory
+WORKDIR /app
+
+# Copy only necessary files
+COPY deno.json .
+COPY . .
+COPY static/img/ static/img/
+
+# Cache dependencies
+RUN deno cache app.ts
+
+# Expose port
+EXPOSE 8080
+
+# Run as non-root user
+RUN adduser -D appuser && chown -R appuser:appuser /app
+USER appuser
+
+# Start application
+# Note: Set SERVICE_DOMAIN environment variable to configure your domain
+# Example: docker run -e SERVICE_DOMAIN=my-ipv4-service.example.com ...
+CMD ["run", "--allow-net", "--allow-read", "src/app.ts"]
--- a/README.md
+++ b/README.md
@@ -0,0 +1,73 @@
+# deno-no-ipv4-here
+*Inspired by [ungleich](https://code.ungleich.ch/ungleich-public/ungleich-no-ipv4-here)*
+
+A simple microservice that responds the following text to all requests
+
+```
+Sorry, (this part of) domain $domain is not reachable by IPv4. Please upgrade to IPv6 and try to reach $domain again.
+```
+
+Written for Deno.
+
+## Configuration
+
+The application uses the following environment variables:
+
+- `SERVICE_DOMAIN`: The domain where this service is hosted (default: "localhost")
+  - Example: `SERVICE_DOMAIN=my-ipv6-service.example.com`
+
+When making requests to this service, the domain you provide in the `back_to` parameter will be compared against this value to determine if it should be treated as an external domain.
+
+## Running with Deno
+
+1. Install Deno: https://deno.land/manual/getting_started/installation
+2. Clone this repository:
+   ```bash
+   git clone https://git.kyun.li/gunter/ungleich-no-ipv4-here
+   cd ungleich-no-ipv4-here
+   ```
+3. Start the service:
+   ```bash
+   deno run --allow-net --allow-read app.ts
+   ```
+4. Set the SERVICE_DOMAIN environment variable for your domain:
+   ```bash
+   SERVICE_DOMAIN=your-domain.example.com deno run --allow-net --allow-read app.ts
+   ```
+
+## Running with Docker
+
+1. Build the Docker image:
+   ```bash
+   docker build -t deno-no-ipv4-here .
+   ```
+2. Run the container with your domain configuration:
+   ```bash
+   docker run -e SERVICE_DOMAIN=your-domain.example.com -p 8080:8080 deno-no-ipv4-here
+   ```
+
+## Example Caddy Configuration
+
+Here's a Caddyfile configuration that redirects all non-configured domains to this service:
+
+```caddy
+# Caddyfile
+(your_domain) {
+    # Your existing configuration for your domain
+    reverse_proxy localhost:8080
+}
+
+# Catch-all for all other domains
+:80, :443 {
+    # Redirect to the no-ipv4-here service
+    redir https://no-ipv4-here.your-domain.example.com?back_to={host} permanent
+}
+```
+
+This configuration:
+1. Handles requests for your configured domain normally
+2. Redirects all other domains to the no-ipv4-here service
+3. Passes the original host as the `back_to` parameter
+4. Uses a permanent redirect (HTTP 301)
+
+Replace `no-ipv4-here.your-domain.example.com` with the domain where you're running this service.
--- a/app.ts
+++ b/app.ts
@@ -0,0 +1,75 @@
+import { Application, Router, type Context, type Next } from "jsr:@oak/oak";
+import { join } from "jsr:@std/path";
+import { Eta } from "jsr:@eta-dev/eta";
+
+// Create Eta instance
+const eta = new Eta({
+  views: join(Deno.cwd(), "src", "views"),
+  cache: Deno.env.get("DENO_ENV") === "production",
+});
+
+// Create Oak application
+const app = new Application();
+const router = new Router();
+
+// Serve static files
+app.use(async (ctx: Context, next: Next) => {
+  const staticPath = join(Deno.cwd(), "src", "static");
+  
+  try {
+    // Strip /static prefix from path
+    const path = ctx.request.url.pathname.replace(/^\/static/, '');
+    
+    await ctx.send({
+      root: staticPath,
+      path: path,
+      index: "index.html",
+    });
+  } catch {
+    await next();
+  }
+});
+
+// Main route handler
+router.get("/", async (ctx: Context) => {
+  const params = ctx.request.url.searchParams;
+  let back_to_url = params.get("back_to") || "";
+  let domain = "";
+
+  // If no back_to parameter, check host header
+  if (!back_to_url) {
+    const host = ctx.request.headers.get("host") || "";
+    const serviceDomain = Deno.env.get("SERVICE_DOMAIN") || "localhost";
+    const domainRegex = new RegExp(`^(${serviceDomain.replace(/\./g, '\\.')}|localhost)`);
+    // Exclude our own hosts
+    if (host && !domainRegex.test(host)) {
+      back_to_url = `http://${host}`;
+    }
+  }
+
+  // Extract domain from URL
+  if (back_to_url) {
+    try {
+      domain = new URL(back_to_url).hostname;
+    } catch {
+      // Invalid URL, ignore
+    }
+  }
+
+  // Render template with context
+  const html = await eta.render("index", {
+    back_to_url,
+    domain: domain || "This part of the Internet",
+  });
+
+  ctx.response.body = html;
+  ctx.response.type = "text/html";
+});
+
+app.use(router.routes());
+app.use(router.allowedMethods());
+
+// Start server
+const port = 8080;
+console.log(`Server running on http://localhost:${port}`);
+await app.listen({ port });
--- a/deno.json
+++ b/deno.json
@@ -0,0 +1,10 @@
+{
+  "imports": {
+    "oak": "https://deno.land/x/oak@v16.0.0/mod.ts",
+    "path": "https://deno.land/std@0.224.0/path/mod.ts",
+    "eta": "https://deno.land/x/eta@v3.1.0/mod.ts"
+  },
+  "tasks": {
+    "start": "deno run --allow-net --allow-read src/app.ts"
+  }
+}
--- a/deno.lock
+++ b/deno.lock
@@ -0,0 +1,290 @@
+{
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+    "jsr:@std/assert@0.224": "0.224.0",
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+    "jsr:@std/encoding@0.223": "0.223.0",
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+    "https://deno.land/x/oak@v16.0.0/application.ts": "c6361a3c3fb3607c5dfe1800b156f07b612979dc0498c746aeca54bb9f643a92",
+    "https://deno.land/x/oak@v16.0.0/body.ts": "0f8a6843720ea6cebba2132a5e4dda5a97bbd49e7fb64e96ade0b7c8009bba2d",
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+    "https://deno.land/x/oak@v16.0.0/forwarded.ts": "97fa621071e4878ce64196055b49cdf8ee63f1bb39185c9446bfb817c209bcc9",
+    "https://deno.land/x/oak@v16.0.0/http_server_bun.ts": "cb3a66c735cd0533c4c3776b37ae627ab42344c82f91dff63e3030d9656fd3a0",
+    "https://deno.land/x/oak@v16.0.0/http_server_native.ts": "3bea00ebb9638203d2449fbf9a14a6b87f119bd45012f13282ececdf7b4c4242",
+    "https://deno.land/x/oak@v16.0.0/http_server_native_request.ts": "a4da6f4939736e6323720db2d4b0d19ff2e83f02e52ab1eea9ae80f2c047fa56",
+    "https://deno.land/x/oak@v16.0.0/http_server_node.ts": "9bb5291c15305b297fd634aa4c6b1d5054368f4b7a171d7c7c302c73eb2489ed",
+    "https://deno.land/x/oak@v16.0.0/middleware.ts": "4170180fe5009d2581a0bdc995e5953b90ccb5b1c3767f3eae8a4fe238b8bd81",
+    "https://deno.land/x/oak@v16.0.0/middleware/etag.ts": "310ed4ed01f2af5384ab78617c82a2bdd7f84d66539172e45ee16452846f0754",
+    "https://deno.land/x/oak@v16.0.0/middleware/proxy.ts": "6e2253f88246c89c5d90678e7705b08966e7352f64a36e28fb12c7c99bbf0cc1",
+    "https://deno.land/x/oak@v16.0.0/middleware/serve.ts": "efceebd70afb73bcabe0a6a8981f3d8474a2f2f30e85b46761aee49e81bd9d6a",
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+    "https://deno.land/x/oak@v16.0.0/node_shims.ts": "4db1569b2b79b73f37c4d947f4aaa50a93e266d48fe67601c8a31af17a28884d",
+    "https://deno.land/x/oak@v16.0.0/request.ts": "b3d356da3f1e45f850d0b11e5637cb9d3d76fb96cb7b45ec9276bf89fa34ac08",
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+    "https://deno.land/x/oak@v16.0.0/router.ts": "882f36a576e280b0d617cc174feca320f02deed77bdea8264444ba8b55cc0422",
+    "https://deno.land/x/oak@v16.0.0/send.ts": "c05e5985b356b568ae4954a40373f93451a3f8cc9ae8706c8b8879e5e0c8c86b",
+    "https://deno.land/x/oak@v16.0.0/testing.ts": "c879789ac721144c3dcad0a06f5afbe2cd94fb20afc32302992942a49a7def90",
+    "https://deno.land/x/oak@v16.0.0/types.ts": "cd4ccd3e182d0cba2117cd27f560267970470ab9c0ff6556cadd73f605193be7",
+    "https://deno.land/x/oak@v16.0.0/utils/clone_state.ts": "cf8989ddd56816b36ada253ae0acdbd46cdf3d68dbe674d2b66c46640fab3500",
+    "https://deno.land/x/oak@v16.0.0/utils/consts.ts": "137c4f73479f5e98a13153b9305f06f0d85df3cf2aacad2c9f82d4c1f3a2f105",
+    "https://deno.land/x/oak@v16.0.0/utils/create_promise_with_resolvers.ts": "de99e9a998162b929a011f8873eaf0895cf4742492b3ce6f6866d39217342523",
+    "https://deno.land/x/oak@v16.0.0/utils/decode_component.ts": "d3e2c40ecdd2fdb79761c6e9ae224cf01a4643f7c5f4c1e0b69698d43025261b",
+    "https://deno.land/x/oak@v16.0.0/utils/encode_url.ts": "c0ed6b318eb9523adeebba32eb9acd059c0f94d3511b2b9e3b024722d1b3dfb8",
+    "https://deno.land/x/oak@v16.0.0/utils/resolve_path.ts": "aa39d54a003b38fee55f340a0cba3f93a7af85b8ddd5fbfb049a98fc0109b36d",
+    "https://deno.land/x/oak@v16.0.0/utils/streams.ts": "6d55543fdeddc3c9c6f512de227b9b33ff4b0ec5e320edc109f0cbf9bef8963f",
+    "https://deno.land/x/oak@v16.0.0/utils/type_guards.ts": "a1b42aa4c431c4c07d3f8a45a2142020f86d5a3e1e319af94fdf2f4c6c72465f"
+  }
+}
--- a/static/img/favicon.ico
+++ b/static/img/favicon.ico
--- a/static/img/ipv6onlyhosting-ungleich-deadend.jpg
+++ b/static/img/ipv6onlyhosting-ungleich-deadend.jpg
--- a/views/index.eta
+++ b/views/index.eta
@@ -0,0 +1,73 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <meta name="viewport" content="width=device-width, initial-scale=1">
+    <style>
+        .responsive {
+            width: 100%;
+            max-width: 496px;
+            height: auto;
+        }
+
+        img {
+            display: block;
+            margin-left: auto;
+            margin-right: auto;
+        }
+
+        .center {
+            text-align: center;
+        }
+
+        .content-margin {
+            margin: 20px 10%;
+        }
+        body {
+            font-family: Helvetica, sans-serif;
+            font-size: 15pt;
+            color: black;
+        }
+        .para-title{
+            font-weight: 600;
+        }
+        footer{
+            margin: 50px 0 25px;
+        }
+    </style>
+    <title><%= it.domain ? it.domain + " is not reachable by IPv4" : "This part of the Internet is not reachable by IPv4" %></title>
+    <meta name="keywords" content="IPv6, IPv4, End of IPv4, IPv6 only">
+    <meta name="description" content="The end of the IPv4 Internet">
+</head>
+<body>
+
+<img src="/img/ipv6onlyhosting-ungleich-deadend.jpg"
+     alt="ipv6onlyhosting-ungleich-deadend"
+     class="responsive" width="600" height="400">
+
+<div class="center content-margin">
+  <p>
+    You have reached the end of the IPv4 Internet.
+
+    <% if (it.back_to_url) { %>
+    <br>
+    The site <%= it.domain %> is not reachable by IPv4.
+    To access
+    <a href="<%= it.back_to_url %>" target="_blank"><%= it.domain %></a>,
+    you need to enable IPv6 on your computer.
+    <% } %>
+
+    <br>
+    Find out
+    <a href="https://ungleich.ch/en-us/cms/blog/2019/02/05/how-to-get-ipv6/">
+      how to enable IPv6</a>.
+    <br>
+    <% /* <a href="https://redmine.ungleich.ch/projects/open-infrastructure/wiki/How_to_disable_IPv4_on_your_website">How
+    to use this service</a> for your IPv6 only service. */ %>
+  </p>
+</div>
+<footer class="center">
+  This service is provided to you by <a href="https://git.kyun.li/gunter/deno-no-ipv4-here" target="_blank">deno-no-ipv4-here</a>.
+  <i>Inspired by <a href="https://ungleich.ch" target="_blank">ungleich</a>.</i>
+</footer>
+</body>
+</html>