commit 9829ba73106ff3f427415bb39f79d74e2dc3cd80
Author: Leonora Tindall <ltindall@fastly.com>
Date:   Mon Sep 19 09:56:48 2022 -0500

    Initial working setup.

diff --git a/.cargo/config b/.cargo/config
new file mode 100644
index 0000000..6b77899
--- /dev/null
+++ b/.cargo/config
@@ -0,0 +1,2 @@
+[build]
+target = "wasm32-wasi"
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..9f6a089
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+/target
+**/*.rs.bk
+/bin
+/pkg
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..591d2b3
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,438 @@
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+
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+ "matches",
+ "percent-encoding",
+]
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..db9479f
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,16 @@
+[package]
+name = "edgeblog"
+version = "0.1.0"
+authors = []
+edition = "2018"
+# Remove this line if you want to be able to publish this crate as open source on crates.io.
+# Otherwise, `publish = false` prevents an accidental `cargo publish` from revealing private source.
+publish = false
+
+[profile.release]
+debug = 1
+
+[dependencies]
+fastly = "^0.8.0"
+pulldown-cmark = "0.9"
+
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..ada44e3
--- /dev/null
+++ b/README.md
@@ -0,0 +1,3 @@
+# Markdown @Edge
+
+A Markdown renderer on the Compute @Edge platform from Fastly!
diff --git a/fastly.toml b/fastly.toml
new file mode 100644
index 0000000..5aee857
--- /dev/null
+++ b/fastly.toml
@@ -0,0 +1,16 @@
+# This file describes a Fastly Compute@Edge package. To learn more visit:
+# https://developer.fastly.com/reference/fastly-toml/
+
+authors = ["nora@nora.codes"]
+description = "A Markdown blog, rendered at the edge."
+language = "rust"
+manifest_version = 2
+name = "edgeblog"
+service_id = "3bjMd8dgb83McAT6FMQum8"
+
+[local_server.backends.upstream]
+url = "http://nora.codes/"
+
+[local_server.backends.upstream_ssl]
+url = "https://nora.codes/"
+
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
new file mode 100644
index 0000000..5914a56
--- /dev/null
+++ b/rust-toolchain.toml
@@ -0,0 +1,3 @@
+[toolchain]
+channel = "stable"
+targets = [ "wasm32-wasi" ]
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..d60a231
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,95 @@
+//! Default Compute@Edge template program.
+
+use fastly::http::{header, Method, StatusCode};
+use fastly::{mime, Body, Error, Request, Response};
+use pulldown_cmark::{html, Options, Parser};
+use std::io::Read;
+
+/// The configured backend name.
+const BACKEND_NAME: &str = "upstream_ssl";
+
+/// The URL of the header markdown content.
+const HEADER_URL: &str = "http://nora.codes/edgeblog/_header.md";
+/// The URL of the footer markdown content.
+const FOOTER_URL: &str = "http://nora.codes/edgeblog/_footer.md";
+
+fn main() -> Result<(), Error> {
+    let req = Request::from_client();
+    // Filter request methods...
+    match req.get_method() {
+        // Allow GET and HEAD requests.
+        &Method::GET | &Method::HEAD => (),
+
+        // Deny anything else.
+        _ => {
+            Response::from_status(StatusCode::METHOD_NOT_ALLOWED)
+                .with_header(header::ALLOW, "GET, HEAD")
+                .with_body_text_plain("This method is not allowed\n")
+                .send_to_client();
+            return Ok(());
+        }
+    };
+
+    // Rewrite the / path to index.md, and construct a Request
+    let upstream_req = match req.get_path() {
+        "/" => Request::get("http://nora.codes/edgeblog/index.md"),
+        path => Request::get(format!("http://nora.codes/edgeblog/{}", path)),
+    };
+
+    // Get the data for the header portion of the page
+    let mut header_body = match Request::get(HEADER_URL).send(BACKEND_NAME) {
+        Err(_e) => Body::new(),
+        Ok(mut r) => r.take_body(),
+    };
+
+    // Get the data for the footer portion of the page
+    let mut footer_body = match Request::get(FOOTER_URL).send(BACKEND_NAME) {
+        Err(_e) => Body::new(),
+        Ok(mut r) => r.take_body(),
+    };
+
+    // Write the header into the synthetic body
+    let mut md_assembled = String::new();
+    header_body.read_to_string(&mut md_assembled)?;
+    md_assembled.push_str("\n");
+
+    // Get the geoip info for the client, if possible.
+    let geotext: String = match req.get_client_ip_addr() {
+        Some(ip) => match fastly::geo::geo_lookup(ip) {
+            None => "an undisclosed location".into(),
+            Some(geo) => format!(
+                "AS{} '{}', in {}",
+                geo.as_number(),
+                geo.as_name(),
+                geo.city()
+            )
+            .into(),
+        },
+        None => "an undisclosed location".into(),
+    };
+
+    // Get the content of the page itself. If this fails, pass on the failure.
+    let mut beresp = upstream_req.send(BACKEND_NAME)?;
+    if beresp.get_status() == StatusCode::OK {
+        beresp.take_body().read_to_string(&mut md_assembled)?;
+        md_assembled = md_assembled.replace("{{geo}}", &geotext);
+    } else {
+        beresp.send_to_client();
+        return Ok(());
+    }
+
+    // Write the footer into the synthetic body
+    md_assembled.push_str("\n");
+    footer_body.read_to_string(&mut md_assembled)?;
+
+    let md_assembled = md_assembled.replace("{{geo}}", &geotext);
+    let parser = Parser::new_ext(&md_assembled, Options::empty());
+
+    let mut client_body = beresp
+        .clone_without_body()
+        .with_content_type(mime::TEXT_HTML_UTF_8)
+        .stream_to_client();
+
+    html::write_html(&mut client_body, parser)?;
+    Ok(())
+}