commit bf649f56612a68bd1867914c38013d7a4c70cf8f
Author: EliasSchriefer <elischriefer@gmail.com>
Date:   Thu Dec 15 13:44:09 2022 +0100

    Add code from coding session + licenses

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/.gitignore
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diff --git a/Cargo.lock b/Cargo.lock
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index 0000000..0927e38
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..648918c
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,20 @@
+[package]
+name = "rss-proxy"
+version = "0.1.0"
+edition = "2021"
+authors = ["EliasSchriefer <elischriefer@gmail.com>"]
+licence = "MIT or Apache-2.0"
+
+[dependencies]
+rss = "^2.0"
+
+scraper = "^0.13"
+ego-tree = "^0.6"
+html5ever = "^0.26"
+
+rayon = "^1.6"
+
+axum = { version = "^0.6", features = ["macros"] }
+hyper = { version = "^0.14", features = ["client", "http2"] }
+hyper-rustls = { version = "^0.23", features = ["http2"] }
+tokio = { version = "^1.23", features = ["rt-multi-thread", "macros"] }
diff --git a/LICENSE-APACHE b/LICENSE-APACHE
new file mode 100644
index 0000000..6c1c70c
--- /dev/null
+++ b/LICENSE-APACHE
@@ -0,0 +1,201 @@
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
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+      outstanding shares, or (iii) beneficial ownership of such entity.
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+      "You" (or "Your") shall mean an individual or Legal Entity
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+          notices within Derivative Works that You distribute, alongside
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+          that such additional attribution notices cannot be construed
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+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
+      for any such Derivative Works as a whole, provided Your use,
+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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+      appropriateness of using or redistributing the Work and assume any
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+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
+      result of this License or out of the use or inability to use the
+      Work (including but not limited to damages for loss of goodwill,
+      work stoppage, computer failure or malfunction, or any and all
+      other commercial damages or losses), even if such Contributor
+      has been advised of the possibility of such damages.
+
+   9. Accepting Warranty or Additional Liability. While redistributing
+      the Work or Derivative Works thereof, You may choose to offer,
+      and charge a fee for, acceptance of support, warranty, indemnity,
+      or other liability obligations and/or rights consistent with this
+      License. However, in accepting such obligations, You may act only
+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS
+
+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "[]"
+      replaced with your own identifying information. (Don't include
+      the brackets!)  The text should be enclosed in the appropriate
+      comment syntax for the file format. We also recommend that a
+      file or class name and description of purpose be included on the
+      same "printed page" as the copyright notice for easier
+      identification within third-party archives.
+
+   Copyright 2022 Elias Schriefer
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
diff --git a/LICENSE-MIT b/LICENSE-MIT
new file mode 100644
index 0000000..e538083
--- /dev/null
+++ b/LICENSE-MIT
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2022 Elias Schriefer
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..8b19f9b
--- /dev/null
+++ b/README.md
@@ -0,0 +1,38 @@
+# rss-proxy
+A media RSS feed server correcting the default thumbnails in its articles
+
+Currently implemented for DeviantArt
+
+## Building
+`rss-proxy` requires Rust and cargo.
+
+For only building the binary in release mode:
+```sh
+$ cargo build --release
+```
+
+## Running
+In release mode (i.e. optimized):
+```sh
+$ cargo run --release
+```
+
+In debug mode (unoptimized, faster):
+```sh
+$ cargo run
+```
+
+## Usage
+The server will by default try to use port 80 or 8080 depending on privileges
+and whether the port is available.
+
+It will then point by default to `https://backend.deviantart.com/rss.xml`
+propagating the query string used for describing your RSS feed.
+
+### Example
+Show pictures in a user's gallery: `http://localhost:8080/?type=gallery&q=by:<username>`
+
+More examples can be found at [DeviantArt's API documentation](https://www.deviantart.com/developers/rss).
+
+## License
+This project is dual-licensed under MIT or Apache 2.0
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..33c13ca
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,87 @@
+use std::sync::{Once, Arc};
+use hyper_rustls::HttpsConnector;
+use rss::Channel;
+use scraper::{Html, Selector};
+use html5ever::{QualName, ns, namespace_url, local_name};
+use rayon::prelude::*;
+use axum::{Server, Router, routing::get, http::Uri, body::Body, response::IntoResponse, extract::State};
+use hyper::{Client, client::HttpConnector};
+
+static mut IMG_SELECTOR: (Option<Selector>, Once) = (None, Once::new());
+
+fn img_selector() -> &'static Selector {
+    unsafe {
+        IMG_SELECTOR.1.call_once(move || {
+            IMG_SELECTOR.0 = Some(Selector::parse(r#"img[alt="thumbnail"]"#).unwrap());
+        });
+        IMG_SELECTOR.0.as_ref().unwrap_unchecked()
+    }
+}
+
+fn update_media(item: &rss::Item) -> rss::Item {
+    try_update_media(&item).unwrap_or(item.to_owned())
+}
+
+fn try_update_media(item: &rss::Item) -> Option<rss::Item> {
+    // correct media URL we want to use
+    let url = item.extensions().get("media")?.get("content")?.get(0)?.attrs().get("url")?.as_str();
+
+    let html = Html::parse_fragment(item.description.as_ref()?.as_str());
+
+    let img_ref = html.select(img_selector()).next().unwrap();
+    let img_html_before = img_ref.html();
+    let mut img = img_ref.value().to_owned();
+    img.attrs.get_mut(&QualName::new(None, ns!(), local_name!("src"))).unwrap().clone_from(&url.into());
+
+    let updated_html = html.root_element().inner_html().replace(&img_html_before, format!("{img:?}").as_str());
+
+    let mut item = item.clone();
+    item.description = Some(updated_html);
+    Some(item)
+}
+
+#[axum::debug_handler]
+async fn rss_proxy_handler(uri: Uri, State(client): State<Arc<Client<HttpsConnector<HttpConnector>>>>) -> axum::response::Result<impl IntoResponse> {
+    let result = || async {
+        let query = uri.query().unwrap_or_default();
+        let new_uri = Uri::builder()
+            .scheme("https")
+            .authority("backend.deviantart.com")
+            .path_and_query(format!("/rss.xml?{query}"))
+            .build()?;
+        
+        let response_buf = hyper::body::to_bytes(client.get(new_uri).await?).await?;
+        let mut rss = Channel::read_from(response_buf.as_ref())?;
+        rss.items = rss.items().into_par_iter().map(update_media).collect();
+
+        Ok::<_, Box<dyn std::error::Error>>(rss.to_string())
+    };
+
+    Ok(result().await.map_err(|err| format!("{err:#?}"))?)
+}
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let client = Arc::new(Client::builder()
+        .build::<_, Body>(hyper_rustls::HttpsConnectorBuilder::new()
+            .with_native_roots()
+            .https_only()
+            .enable_http2()
+            .build()
+        ));
+
+    let app = Router::new()
+        .route("/", get(rss_proxy_handler))
+        .with_state(client);
+
+    let socket_addrs = ("0.0.0.0:80".parse()?, "0.0.0.0:8080".parse()?);
+    Server::try_bind(&socket_addrs.0)
+        .or_else(|_| {
+            eprintln!("Could not connect to port 80, now using port 8080");
+            Server::try_bind(&socket_addrs.1)
+        })?
+        .serve(app.clone().into_make_service())
+        .await?;
+
+    Ok(())
+}