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Sebastian Hugentobler 2023-11-15 16:26:35 +01:00
commit 2a9f427bc7
Signed by: shu
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/target
Containerfile

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pipeline:
publish-docker-image:
image: plugins/kaniko
settings:
repo: docker.io/thallian/fp-feed
tags: latest,${CI_COMMIT_SHA:0:8},${CI_COMMIT_TAG=pre}
dockerfile: Dockerfile
username:
from_secret: DOCKER_USER
password:
from_secret: DOCKER_PW

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GNU AFFERO GENERAL PUBLIC LICENSE
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if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU AGPL, see
<https://www.gnu.org/licenses/>.

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29
Cargo.toml Normal file
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[package]
name = "findpenguins-feed"
version = "0.1.0"
edition = "2021"
authors = ["Sebastian Hugentobler <shu@vanwa.ch>"]
license = "AGPL-3.0-or-later"
[dependencies]
askama = "0.12.1"
axum = { version = "0.6.20", features = ["tracing"] }
config = { version = "0.13.3", features = ["toml"] }
directories = "5.0.1"
fnv = "1.0.7"
futures = "0.3.29"
reqwest = { version = "0.11.22", default-features = false, features = [
"rustls-tls",
] }
rss = "2.0.6"
scraper = "0.18.1"
serde = "1.0.192"
thiserror = "1.0.50"
time = { version = "0.3.30", features = ["formatting", "parsing", "serde"] }
tokio = { version = "1.34.0", features = ["full"] }
tower-http = { version = "0.4.4", features = ["trace"] }
tracing = "0.1.40"
tracing-subscriber = { version = "0.3.18", features = ["env-filter"] }
[profile.release]
strip = true

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FROM docker.io/rust:1-alpine3.18 AS builder
ARG ARCH=x86_64
RUN apk --no-cache add musl-dev
ENV CARGO_CARGO_NEW_VCS="none"
ENV CARGO_BUILD_RUSTFLAGS="-C target-feature=+crt-static"
ENV CARGO_BUILD_TARGET="$ARCH-unknown-linux-musl"
WORKDIR /work
RUN cargo init
COPY Cargo.toml Cargo.lock ./
RUN cargo build --release
COPY . .
# ensure rebuilding of the app
RUN touch src/main.rs
RUN cargo build --release
RUN cp "./target/$CARGO_BUILD_TARGET/release/findpenguins-feed" /app
FROM scratch
COPY --from=builder /app /app
CMD ["/app"]

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# Find Penguins Feed
Quick & dirty tool to turn [Find Penguins](https://findpenguins.com) footprints
into a rss feeds.
There is no storage involved and every call to the feed builds it anew. Because
this is done by web-scraping, it should not be done too often, as you might get
rate limited or blocked.
This was written to track a family member's journey without having to register
or madly refreshing the website all five minutes.
It only needed to work for that specific journey but maybe someone else finds it
useful.
# Building
Install [rust](https://www.rust-lang.org/) and run `cargo build --release`. This
gives you a binary `./target/release/findpenguins-feed>` which is directly
executable.
# Configuration
Configuration is handled with a confoguration file and/or environment variables.
The configuration file is sourced from the following locations, depending on the
operating system:
- \*nix: `$XDG_CONFIG_HOME/.config/findpenguins-feed/config.toml`
- Windows: `{FOLDERID_RoamingAppData}/findpenguins-feed/config/config.toml`
- macOS: `$HOME/Library/Preferences/ch.vanwa.findpenguins-feed/config.toml`
## server_address
IP and port the server should listen on.
- default: `[::1]:3000`
- env var: `FINDPENGUINS_FEED__SERVER_ADDRESS`
## feeds
List of find penguin journeys to track.
- default: `[]`
- env var: `FINDPENGUINS_FEED__FEEDS` (urls are comma separated)
Example configuration file:
```
server_address = "[::1]:4000"
feeds = [
"https://findpenguins.com/1234/trip/trip-2023",
"https://findpenguins.com/1234/trip/trip-2022"
]
```

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use std::collections::HashMap;
use std::sync::Arc;
use axum::Router;
use tower_http::trace::TraceLayer;
use crate::{feeds::Feed, routes};
#[derive(Debug)]
pub struct AppState {
pub feeds: HashMap<String, Feed>,
}
pub fn create(feeds: HashMap<String, Feed>) -> Router {
let app_state = Arc::new(AppState { feeds });
Router::new()
.nest("/", routes::all())
.with_state(app_state)
.layer(TraceLayer::new_for_http())
}

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use std::path::PathBuf;
use config::{Config, ConfigError, Environment};
use directories::ProjectDirs;
use serde::Deserialize;
use thiserror::Error;
use tracing::debug;
#[derive(Error, Debug)]
pub enum AppConfigError {
#[error("No valid home directory found.")]
HomePathError,
#[error("Configuration error.")]
ConfigError(#[from] ConfigError),
}
fn default_server_address() -> String {
String::from("[::1]:3000")
}
fn default_feeds() -> Vec<String> {
Vec::new()
}
#[derive(Clone, Debug, Default, Deserialize)]
pub struct PenguinConfig {
#[serde(default = "default_server_address")]
pub server_address: String,
#[serde(default = "default_feeds")]
pub feeds: Vec<String>,
}
impl PenguinConfig {
/// Find the correct project directory for the respective operating system.
fn get_project_dirs() -> Result<ProjectDirs, AppConfigError> {
let project_dirs = ProjectDirs::from("ch", "vanwa", "findpenguins-feed")
.ok_or(AppConfigError::HomePathError)?;
Ok(project_dirs)
}
/// Find the correct configuration file for the respective operating system.
/// - linux: `$XDG_CONFIG_HOME/stray/config.toml` or `$HOME/.config/stray/config.toml`
/// - macOS: `$HOME/Library/Preferences/ch.fhnw.stray/config.toml`
/// - windows: `{FOLDERID_RoamingAppData}/stray/config/config.toml`
fn config_path() -> Result<PathBuf, AppConfigError> {
let project_dirs = Self::get_project_dirs()?;
let config_path = project_dirs.config_dir();
let config_file = config_path.join("config.toml");
Ok(config_file)
}
/// Read the server configuration.
/// See [config_path](struct.AppConfig.html#method.config_path) for the different configuration file paths.
/// Everything in the config file can be overridden at runtime by setting the respective ENV variables.
/// Use `__` (double underscore) as a separator between hierarchies.
/// For example `WOWEB__INITIAL_REMOTES="http://[::1]:3002,http://[::1]:3003"`
/// This is necessary for configuration keys to have single underscores.
pub fn read() -> Result<Self, AppConfigError> {
let mut config_builder = Config::builder();
if let Ok(config_path) = Self::config_path() {
debug!("trying config file at {:#?}...", config_path);
config_builder =
config_builder.add_source(config::File::from(config_path).required(false));
}
debug!("merging settings from environment variables...");
config_builder = config_builder.add_source(
Environment::with_prefix("findpenguins_feed")
.separator("__")
.list_separator(",")
.with_list_parse_key("feeds")
.try_parsing(true),
);
Ok(config_builder.build()?.try_deserialize()?)
}
}

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use std::collections::HashMap;
use std::fmt;
use futures::future::join_all;
use rss::{GuidBuilder, Item, ItemBuilder};
use serde::Deserialize;
use time::format_description::well_known::iso8601::FormattedComponents;
use time::format_description::well_known::{iso8601, Iso8601};
use time::Date;
use crate::scrapers::page_url;
use crate::{hash, scrapers};
pub mod route;
pub mod template;
#[derive(Clone, Debug, Deserialize)]
pub struct Feed {
pub title: String,
pub url: String,
pub id: String,
}
impl fmt::Display for Feed {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{} ({})", self.title, self.url)
}
}
#[derive(Clone, Debug, Deserialize)]
pub struct Footprint {
pub title: String,
pub text: String,
pub url: String,
pub date: Date,
pub page: u8,
}
const ISO8601_DATE: u128 = iso8601::Config::DEFAULT
.set_formatted_components(FormattedComponents::Date)
.encode();
impl Footprint {
pub fn into_rss_item(self, root_url: &str) -> Item {
let desc = format!(
"{} <br /><br /> --- <br /><br /> from {}",
self.text,
page_url(root_url, self.page)
);
ItemBuilder::default()
.title(Some(self.title))
.pub_date(self.date.format(&Iso8601::<ISO8601_DATE>).ok())
.link(Some(self.url.clone()))
.description(Some(desc))
.guid(Some(GuidBuilder::default().value(self.url).build()))
.build()
}
}
pub async fn enrich_feeds(feed_urls: Vec<String>) -> HashMap<String, Feed> {
let feeds = join_all(feed_urls.iter().map(|feed_url| async {
let title = scrapers::feed_title(feed_url).await.unwrap();
let id = hash::fnv_str(feed_url);
Feed {
title,
url: feed_url.clone(),
id,
}
}))
.await;
feeds.iter().map(|x| (x.id.clone(), x.clone())).collect()
}

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use std::sync::Arc;
use axum::extract::Path;
use axum::http::StatusCode;
use axum::{extract::State, response::IntoResponse};
use rss::{ChannelBuilder, Item};
use crate::scrapers::fetch_footprints;
use crate::{app::AppState, templates::HtmlTemplate};
use super::template::FeedsTemplate;
pub async fn feeds(State(state): State<Arc<AppState>>) -> impl IntoResponse {
let template = FeedsTemplate {
feeds: state.feeds.values().cloned().collect(),
};
HtmlTemplate(template)
}
pub async fn feed(
State(state): State<Arc<AppState>>,
Path(feed_id): Path<String>,
) -> Result<impl IntoResponse, StatusCode> {
let feed = state.feeds.get(&feed_id).ok_or(StatusCode::NOT_FOUND)?;
let footprints = fetch_footprints(&feed.url)
.await
.map_err(|_| StatusCode::INTERNAL_SERVER_ERROR)?;
let footprints: Vec<Item> = footprints
.iter()
.map(|x| x.clone().into_rss_item(&feed.url))
.collect();
let channel = ChannelBuilder::default()
.title(&feed.title)
.link(&feed.url)
.description(format!("FindPenguins: {}", &feed.title))
.items(footprints)
.build();
Ok((
StatusCode::OK,
[("Content-Type", "application/rss+xml")],
channel.to_string(),
))
}

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use askama::Template;
use super::Feed;
#[derive(Template)]
#[template(path = "feeds.html")]
pub struct FeedsTemplate {
pub feeds: Vec<Feed>,
}

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use std::hash::Hasher;
use fnv::FnvHasher;
pub fn fnv_str(input: &str) -> String {
let mut hasher = FnvHasher::default();
hasher.write(input.as_bytes());
let hash = hasher.finish();
let short_hash = format!("{:x}", hash);
short_hash
}

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use tracing::debug;
use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt};
pub(crate) fn setup(bin_name: &str) {
let default_config = format!("{}=debug,tower_http=debug,axum::rejection=trace", bin_name);
tracing_subscriber::registry()
.with(
tracing_subscriber::EnvFilter::try_from_default_env()
.unwrap_or_else(|_| default_config.into()),
)
.with(tracing_subscriber::fmt::layer().with_target(true))
.init();
debug!("tracing/logging is setup");
}

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use std::net::SocketAddr;
use crate::{config::PenguinConfig, feeds::enrich_feeds};
mod app;
mod config;
mod feeds;
mod hash;
mod logging;
mod routes;
mod scrapers;
mod signals;
mod templates;
#[tokio::main]
async fn main() {
logging::setup("findpenguins_feed");
let config = PenguinConfig::read().expect("Failed to read application configuration");
let addr = get_addr(&config);
let feeds = enrich_feeds(config.feeds).await;
let app = app::create(feeds);
tracing::debug!("Listening on {}", addr);
axum::Server::bind(&addr)
.serve(app.into_make_service())
.with_graceful_shutdown(signals::shutdown())
.await
.expect("Failed to start server");
}
/// Retrieve the address to listen on.
///
/// # Returns
///
/// A `SocketAddr` object that represents the address to listen on.
///
/// # Panics
///
/// If the `host` string cannot be parsed into a `SocketAddr` object.
fn get_addr(config: &PenguinConfig) -> SocketAddr {
config
.server_address
.parse()
.expect("No proper address to listen on: {}")
}

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use std::sync::Arc;
use axum::{body::Body, routing::get, Router};
use crate::{app::AppState, feeds};
pub fn all() -> Router<Arc<AppState>, Body> {
Router::new()
.route("/", get(feeds::route::feeds))
.route("/feeds/:id", get(feeds::route::feed))
}

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use crate::feeds::Footprint;
use scraper::{ElementRef, Html, Selector};
use thiserror::Error;
use time::{format_description, Date};
#[derive(Error, Debug)]
pub enum ScrapeError {
#[error("An error occurred fetching a document.")]
FetchError(#[from] reqwest::Error),
#[error("An error occurred constructing a selector.")]
SelectorError(#[from] scraper::error::SelectorErrorKind<'static>),
}
pub async fn feed_title(feed_url: &str) -> Result<String, ScrapeError> {
let resp = reqwest::get(feed_url).await?.text().await?;
let doc = Html::parse_document(&resp);
let title_selector = Selector::parse("span.placeholder")?;
let title = doc
.select(&title_selector)
.find_map(|x| x.text().next())
.unwrap_or("no title");
Ok(title.to_string())
}
pub async fn fetch_footprints(feed_url: &str) -> Result<Vec<Footprint>, ScrapeError> {
let footprint_selector = Selector::parse("li.footprint div.footprint-container")?;
let footprint_title_selector = Selector::parse("div.title > h2.headline > a")?;
let footprint_date_selector = Selector::parse("div.title > span.date > span.desc")?;
let more_selector = Selector::parse("a#footprintListLoadMore")?;
let text_selector = Selector::parse("div.text > p")?;
let text_rest_selector = Selector::parse("div.text > p > span.rest")?;
let mut footprints: Vec<Footprint> = Vec::new();
let mut has_more_pages = true;
let mut page = 1u8;
while has_more_pages {
let feed_url = page_url(feed_url, page);
let resp = reqwest::get(feed_url).await?.text().await?;
let doc = Html::parse_document(&resp);
footprints.extend(doc.select(&footprint_selector).flat_map(|x| {
parse_footprint(
&x,
&footprint_title_selector,
&footprint_date_selector,
&text_selector,
&text_rest_selector,
page,
)
}));
has_more_pages = doc.select(&more_selector).next().is_some();
page += 1;
}
Ok(footprints)
}
fn parse_footprint(
footprint_el: &ElementRef,
footprint_title_selector: &Selector,
footprint_date_selector: &Selector,
text_selector: &Selector,
text_rest_selector: &Selector,
page: u8,
) -> Option<Footprint> {
let title_el = footprint_el.select(footprint_title_selector).next()?;
let title = title_el.text().next()?.to_string();
let url = title_el.value().attr("href")?.to_string();
let date = footprint_el
.select(footprint_date_selector)
.next()?
.value()
.attr("content")?;
let format = format_description::parse("[year]-[month]-[day]").ok()?;
let date = Date::parse(date, &format).ok()?;
let text = footprint_el
.select(text_selector)
.next()?
.text()
.next()?
.to_string();
let text = if let Some(text_rest) = footprint_el.select(text_rest_selector).next() {
format!("{}{}", text, text_rest.text().next()?)
} else {
text
}
.trim()
.to_string();
Some(Footprint {
title,
url,
date,
text,
page,
})
}
pub fn page_url(feed_url: &str, page: u8) -> String {
let connector = if feed_url.contains('?') { "&" } else { "?" };
format!("{}{}page={}&sort=ASC", feed_url, connector, page)
}

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use tokio::signal;
use tracing::debug;
///
/// Handle SIGTERM and SIGINT on our own. This is needed for the process to behave properly when
/// running as PID 1 (as is the case as the sole thing in a container).
///
/// Includes configuration for non-unix systems but that is untested as well as not expected to be
/// used.
pub(crate) async fn shutdown() {
let ctrl_c = async {
signal::ctrl_c()
.await
.expect("failed to install Ctrl+C handler");
};
#[cfg(unix)]
let terminate = async {
signal::unix::signal(signal::unix::SignalKind::terminate())
.expect("failed to install signal handler")
.recv()
.await;
};
#[cfg(not(unix))]
let terminate = std::future::pending::<()>();
tokio::select! {
_ = ctrl_c => {},
_ = terminate => {},
}
debug!("signal received, shutting down...");
}

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use askama::Template;
use axum::{
http::StatusCode,
response::{Html, IntoResponse, Response},
};
pub struct HtmlTemplate<T>(pub T);
impl<T> IntoResponse for HtmlTemplate<T>
where
T: Template,
{
fn into_response(self) -> Response {
match self.0.render() {
Ok(html) => Html(html).into_response(),
Err(err) => (
StatusCode::INTERNAL_SERVER_ERROR,
format!("Failed to render template. Error: {}", err),
)
.into_response(),
}
}
}

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<ul>
{% for f in feeds %}
<li>
<a href="{{ f.url }}">{{ f.title }}</a> - <a href="/feeds/{{f.id}}">Feed</a>
</li>
{% endfor %}
</ul>