From 0f134ad61b63a1d5b95d2b94ab430839652cd9cc Mon Sep 17 00:00:00 2001
From: Thomas Koch <thomas@koch.ro>
Date: Fri, 10 Jan 2025 11:39:54 +0200
Subject: [PATCH] .

---
 .gitignore           |    2 +
 Cargo.lock           | 2056 ++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml           |   18 +
 README.org           |   18 +
 mars.toml.example    |    8 +
 src/feed_store.rs    |  141 +++
 src/fetcher.rs       |   70 ++
 src/main.rs          |   98 ++
 templates/index.html |    8 +
 9 files changed, 2419 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 README.org
 create mode 100644 mars.toml.example
 create mode 100644 src/feed_store.rs
 create mode 100644 src/fetcher.rs
 create mode 100644 src/main.rs
 create mode 100644 templates/index.html

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..251429b
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+/target
+/mars.toml
\ No newline at end of file
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..540750f
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,2056 @@
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+ "zerofrom",
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+]
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..92a58eb
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,18 @@
+[package]
+name = "planet-mars"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+# ammonia = "*" done by feed-rs
+clap = { version = "*", features = ["derive"] }
+env_logger = "*"
+feed-rs = "*"
+log = "*"
+serde = { version = "*", features = ["derive"] }
+slug = "*"
+tera = "*"
+toml = "*"
+ureq = { version = "3.0.0-rc5", features = ["brotli", "charset", "gzip", "native-tls"]}
+url = "*"
+
diff --git a/README.org b/README.org
new file mode 100644
index 0000000..5d30e42
--- /dev/null
+++ b/README.org
@@ -0,0 +1,18 @@
+Simple planet like planet venus but in rust and maintained.
+
+** todo
+Also see todos in the source files
+
+*** do clippy and rustfmt
+*** TODO error handling everywhere
+*** write templates for html and atom/rss feeds
+*** use a nice lib to process the config file
+- should check whether dirs exists and are writeable
+- should check whether feed urls can be parsed
+** Credits
+
+While writing this, I read and also copied code from:
+
+- [[https://docs.rs/crate/agro/0.1.1][agro]]
+- [[https://github.com/kitallis/hades][haded]] by Akshay Gupta
+- [[https://github.com/djc/planetrs][planetrs]] by Vagdish/Adau, Dirkjan Ochtman, Josh Matthews
diff --git a/mars.toml.example b/mars.toml.example
new file mode 100644
index 0000000..dfaba87
--- /dev/null
+++ b/mars.toml.example
@@ -0,0 +1,8 @@
+bot_name = "planet-mars"
+feed_dir = "/var/lib/planet-mars/feeds"
+from = "thomas@koch.ro"
+out_dir = "/var/lib/planet-mars/out"
+templates_dir = "/var/lib/planet-mars/templates"
+
+[[feeds]]
+url = "https://blog.fefe.de/rss.xml"
diff --git a/src/feed_store.rs b/src/feed_store.rs
new file mode 100644
index 0000000..6b162de
--- /dev/null
+++ b/src/feed_store.rs
@@ -0,0 +1,141 @@
+use feed_rs::model::Entry;
+use feed_rs::model::Feed;
+use serde::{Deserialize, Serialize};
+use std::fs;
+use std::io::BufReader;
+use std::path::PathBuf;
+use ureq::http::HeaderMap;
+use ureq::http::Response;
+use ureq::Body;
+use url::Url;
+
+#[derive(Deserialize, Serialize, Default)]
+pub struct FetchData {
+    pub etag: String,
+    pub date: String,
+}
+
+pub struct FeedStore {
+    pub dir: PathBuf,
+}
+
+impl FeedStore {
+    pub fn new(dir: String) -> Self {
+        Self {
+            dir: super::to_checked_pathbuf(dir),
+        }
+    }
+
+    fn slugify_url(url: &Url) -> String {
+        let domain = url.domain().unwrap();
+        let query = url.query().unwrap_or("");
+        slug::slugify(format!("{domain}{}{query}", url.path()))
+    }
+
+    fn feed_path(&self, url: &Url) -> String {
+        format!("{}/{}", self.dir.display(), Self::slugify_url(url))
+    }
+
+    fn fetchdata_path(&self, url: &Url) -> String {
+        format!("{}.toml", self.feed_path(url))
+    }
+
+    pub fn get_fetchdata(&self, url: &Url) -> FetchData {
+        let path = self.fetchdata_path(url);
+        if !fs::exists(path.clone()).unwrap() {
+            return FetchData::default();
+        }
+        toml::from_str(&fs::read_to_string(path).unwrap()).unwrap()
+    }
+
+    fn has_changed(&self, url: &Url, new_feed: &Feed) -> bool {
+        let Some(old_feed) = self.load_feed(url, false) else {
+            return true;
+        };
+
+        let mut old_iter = old_feed.entries.iter();
+        for new in &new_feed.entries {
+            let Some(old) = old_iter.next() else {
+                return true;
+            };
+            if old != new {
+                return true;
+            }
+        }
+        // ignoring any entries left in old_iter
+        false
+    }
+
+    pub fn store(&self, url: &Url, mut response: Response<Body>) -> bool {
+        let headers = response.headers();
+        let fetchdata = FetchData {
+            etag: hv(headers, "etag"),
+            date: hv(headers, "date"),
+        };
+
+        let body = response
+            .body_mut()
+            .with_config()
+            //            .limit(MAX_BODY_SIZE)
+            .read_to_vec()
+            .unwrap();
+        let feed = match feed_rs::parser::parse(body.as_slice()) {
+            Ok(f) => f,
+            Err(e) => {
+                warn!("Error when parsing feed for {url}: {e:?}");
+                return false;
+            }
+        };
+        if !self.has_changed(url, &feed) {
+            return false;
+        }
+        let _ = fs::write(self.feed_path(url), body);
+        let _ = fs::write(
+            self.fetchdata_path(url),
+            toml::to_string(&fetchdata).unwrap(),
+        );
+        true
+    }
+
+    fn load_feed(&self, url: &Url, sanitize: bool) -> Option<Feed> {
+        let parser = feed_rs::parser::Builder::new()
+            .sanitize_content(sanitize)
+            .build();
+
+        let path = self.feed_path(url);
+        if !fs::exists(path.clone()).unwrap() {
+            return None;
+        }
+        let file = fs::File::open(path).unwrap();
+        Some(parser.parse(BufReader::new(file)).unwrap())
+    }
+
+    pub fn collect(&self, feed_configs: &Vec<super::FeedConfig>) -> Vec<Entry> {
+        let mut entries = vec![];
+
+        for feed_config in feed_configs {
+            let url = Url::parse(&feed_config.url).unwrap();
+            let Some(mut feed) = self.load_feed(&url, true) else {
+                // todo error handling!
+                warn!("Problem parsing feed file for feed {}", feed_config.url);
+                continue;
+            };
+            entries.append(&mut feed.entries);
+            // todo also trim mid-way when length > something, trading cpu for memory
+        }
+        trim_entries(entries)
+    }
+}
+
+fn trim_entries(mut entries: Vec<Entry>) -> Vec<Entry> {
+    entries.sort_by_key(|e| std::cmp::Reverse(e.updated.or(e.published).unwrap_or_default()));
+    entries.truncate(10);
+    entries
+}
+
+fn hv(headers: &HeaderMap, key: &str) -> String {
+    match headers.get(key) {
+        Some(hv) => hv.to_str().unwrap_or_default().to_string(),
+        _ => "".to_string(),
+    }
+}
diff --git a/src/fetcher.rs b/src/fetcher.rs
new file mode 100644
index 0000000..43d08bb
--- /dev/null
+++ b/src/fetcher.rs
@@ -0,0 +1,70 @@
+use std::time::Instant;
+use ureq::tls::{TlsConfig, TlsProvider};
+use ureq::Agent;
+use url::Url;
+
+use crate::FeedStore;
+
+pub struct Fetcher {
+    agent: Agent,
+    /// FROM header for requests
+    from: String,
+}
+
+impl Fetcher {
+    pub fn new(bot_name: &str, from: &str) -> Fetcher {
+        // TODO Get URL from a better place, e.g. Cargo.toml?
+        let ua_name = format!("{bot_name}/{} https://TODO", env!("CARGO_PKG_VERSION"));
+        let agent = Agent::config_builder()
+            .http_status_as_error(false)
+            .user_agent(ua_name)
+            .tls_config(
+                TlsConfig::builder()
+                    .provider(TlsProvider::NativeTls)
+                    .build(),
+            )
+            .build()
+            .into();
+        Fetcher {
+            agent,
+            from: from.to_string(),
+        }
+    }
+
+    pub fn fetch(&self, url: Url, feed_store: &FeedStore) -> bool {
+        let fetchdata = feed_store.get_fetchdata(&url);
+        let mut builder = self
+            .agent
+            .get(url.to_string())
+            .header("FROM", self.from.clone());
+        if fetchdata.etag != "" {
+            builder = builder.header("If-None-Match", fetchdata.etag);
+        }
+        if fetchdata.date != "" {
+            builder = builder.header("If-Modified-Since", fetchdata.date);
+        }
+
+        let start_instant = Instant::now();
+        let result = builder.call();
+        let duration = start_instant.elapsed();
+
+        let response = result.unwrap(); // todo log and return false
+        debug!(
+            "fetched with status {} in {} ms: {url}",
+            response.status(),
+            duration.as_millis()
+        );
+        let status = response.status();
+        match status.as_u16() {
+            304 => false, // Not Modified -> nothing to do
+            200 => feed_store.store(&url, response),
+            _ => {
+                warn!(
+                    "HTTP Status {} not implemented for {url}",
+                    response.status()
+                );
+                false
+            }
+        }
+    }
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..5729cd7
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,98 @@
+#[macro_use]
+extern crate log;
+
+use crate::feed_store::FeedStore;
+use crate::fetcher::Fetcher;
+use clap::Parser;
+use serde::Deserialize;
+use std::fs;
+use std::path::PathBuf;
+use url::Url;
+
+mod feed_store;
+mod fetcher;
+
+#[derive(Parser)]
+#[command(author, version, about, long_about = None)]
+struct Args {
+    #[arg(
+        short,
+        long,
+        default_value_t = String::from("mars.toml")
+    )]
+    config: String,
+}
+
+#[derive(Deserialize)]
+struct Config {
+    /// to be used as part of the fetchers username header
+    bot_name: String,
+    /// where to store downloaded feeds and their metadata
+    feed_dir: String,
+    /// feeds to be agregated
+    feeds: Vec<FeedConfig>,
+    /// Email adress to use for the from header when fetching feeds
+    from: String,
+    /// where to build the output files
+    out_dir: String,
+    /// templates folder
+    templates_dir: String,
+}
+
+pub fn to_checked_pathbuf(dir: String) -> PathBuf {
+    let dir: PathBuf = PathBuf::from(dir);
+
+    let m = dir
+        .metadata()
+        .unwrap_or_else(|_| panic!("Could not get metadata of dir: {}", dir.display()));
+    assert!(m.is_dir(), "Not a dir: {}", dir.display());
+    dir
+}
+
+#[derive(Deserialize)]
+struct FeedConfig {
+    url: String,
+}
+
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    env_logger::init();
+    info!("starting up");
+
+    let args = Args::parse();
+    let config_path = &args.config;
+    if !fs::exists(config_path)? {
+        panic!("Configuration file {config_path} does not exist!");
+    }
+    let config: Config = toml::from_str(&fs::read_to_string(config_path)?)?;
+    let templates_dir = to_checked_pathbuf(config.templates_dir);
+    let out_dir = to_checked_pathbuf(config.out_dir);
+
+    let feed_store = FeedStore::new(config.feed_dir);
+    let fetcher = Fetcher::new(&config.bot_name, &config.from);
+
+    let mut rebuild = false;
+    for feed in &config.feeds {
+        let url = Url::parse(&feed.url)?;
+        rebuild |= fetcher.fetch(url, &feed_store);
+    }
+    info!("Done fetching. Rebuild needed: {rebuild}");
+    if rebuild {
+        let entries = feed_store.collect(&config.feeds);
+        let mut tera = match tera::Tera::new(&format!("{}/*", &templates_dir.display())) {
+            Ok(t) => t,
+            Err(e) => {
+                println!("Parsing error(s): {}", e);
+                ::std::process::exit(1);
+            }
+        };
+        tera.autoescape_on(vec![]);
+        let mut context = tera::Context::new();
+        context.insert("entries", &entries);
+        for name in tera.get_template_names() {
+            debug!("Processing template {name}");
+            let file = fs::File::create(&format!("{}/{name}", out_dir.display()))?;
+            let _ = tera.render_to(name, &context, file)?;
+        }
+    }
+    Ok(())
+}
diff --git a/templates/index.html b/templates/index.html
new file mode 100644
index 0000000..5ecbc15
--- /dev/null
+++ b/templates/index.html
@@ -0,0 +1,8 @@
+hello world
+
+{% for entry in entries %}
+  {% for link in entry.links %}
+    {{link.href}}
+  {% endfor %}
+{% endfor %}
+