From 2a93ce8093da4ac03eb696f6b603b571ce23259d Mon Sep 17 00:00:00 2001
From: Matthias Endler <matthias-endler@gmx.net>
Date: Wed, 5 Aug 2020 00:32:37 +0200
Subject: [PATCH] Extract from hello-rust/show repository

---
 .gitignore  |    1 +
 Cargo.lock  | 1823 +++++++++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml  |   13 +
 src/main.rs |  146 +++++
 4 files changed, 1983 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 src/main.rs

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000000..ea8c4bf7f3
--- /dev/null
+++ b/.gitignore
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diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000000..aabd00a5ba
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+edition = "2018"
+
+[dependencies]
+github-rs = "0.7.0"
+serde_json = "1.0.56"
+regex = "1.3.9"
+reqwest = { version = "0.10", features = ["blocking"] }
+pulldown-cmark = "0.7.2"
+pico-args = "0.3.3"
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000000..1f0e720729
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,146 @@
+use github_rs::client::{Executor, Github};
+use github_rs::StatusCode;
+use pulldown_cmark::{Event, Parser, Tag};
+use regex::Regex;
+use serde_json::Value;
+use std::fs;
+use std::{env, error::Error};
+
+struct Checker {
+    client: Github,
+}
+
+impl Checker {
+    /// Creates a new link checker
+    pub fn new(token: String) -> Self {
+        let client = Github::new(token).unwrap();
+        Checker { client }
+    }
+
+    fn check_github(&self, owner: String, repo: String) -> bool {
+        let (_headers, status, _json) = self
+            .client
+            .get()
+            .repos()
+            .owner(&owner)
+            .repo(&repo)
+            .execute::<Value>()
+            .expect("Get failed");
+        status == StatusCode::OK
+    }
+
+    fn check_normal(&self, url: &String) -> bool {
+        let res = reqwest::blocking::get(url);
+        if let Ok(res) = res {
+            res.status().is_success()
+        } else {
+            false
+        }
+    }
+
+    fn extract_github(&self, url: &String) -> Result<(String, String), Box<dyn Error>> {
+        let re = Regex::new(r"github\.com/(.*?)/(.*)/?")?;
+        let caps = re.captures(&url).ok_or("Invalid capture")?;
+        let owner = caps.get(1).ok_or("Cannot capture owner")?;
+        let repo = caps.get(2).ok_or("Cannot capture repo")?;
+        Ok((owner.as_str().into(), repo.as_str().into()))
+    }
+
+    pub fn check(&self, url: &String) -> bool {
+        match self.extract_github(&url) {
+            Ok((owner, repo)) => self.check_github(owner, repo),
+            _ => self.check_normal(&url),
+        }
+    }
+}
+
+fn extract_links(md: &str) -> Vec<String> {
+    let mut links: Vec<String> = Vec::new();
+    Parser::new(md).for_each(|event| match event {
+        Event::Start(Tag::Link(_, link, _)) => links.push(link.into_string()),
+        Event::Start(Tag::Image(_, link, _)) => links.push(link.into_string()),
+        _ => (),
+    });
+
+    links
+}
+
+struct Args {
+    verbose: bool,
+}
+
+fn main() -> Result<(), Box<dyn Error>> {
+    let mut args = pico_args::Arguments::from_env();
+    let args = Args {
+        verbose: args.contains(["-v", "--verbose"]),
+    };
+
+    let checker = Checker::new(env::var("GITHUB_TOKEN")?);
+    let md = fs::read_to_string("README.md")?;
+    let links: Vec<String> = extract_links(&md);
+
+    let mut errorcode = 0;
+    for link in links {
+        match checker.check(&link) {
+            true => {
+                if args.verbose {
+                    println!("✅{}", link);
+                }
+            }
+            false => {
+                println!("❌{}", link);
+                errorcode = 1;
+            }
+        }
+    }
+    std::process::exit(errorcode)
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+    use std::env;
+
+    #[test]
+    fn test_is_github() {
+        let checker = Checker::new("foo".into());
+        assert_eq!(
+            checker
+                .extract_github(&"https://github.com/mre/idiomatic-rust".into())
+                .unwrap(),
+            ("mre".into(), "idiomatic-rust".into())
+        );
+    }
+
+    #[test]
+    fn test_github() {
+        let checker = Checker::new(env::var("GITHUB_TOKEN").unwrap());
+        assert_eq!(
+            checker.check("https://github.com/mre/idiomatic-rust".into()),
+            true
+        );
+    }
+
+    #[test]
+    fn test_github_nonexistent() {
+        let checker = Checker::new(env::var("GITHUB_TOKEN").unwrap());
+        assert_eq!(
+            checker.check("https://github.com/mre/idiomatic-rust-doesnt-exist-man".into()),
+            false
+        );
+    }
+
+    #[test]
+    fn test_non_github() {
+        let checker = Checker::new(env::var("GITHUB_TOKEN").unwrap());
+        let valid = checker.check("https://endler.dev".into());
+        assert_eq!(valid, true);
+    }
+
+    #[test]
+    fn test_non_github_nonexistent() {
+        let checker = Checker::new(env::var("GITHUB_TOKEN").unwrap());
+        let valid = checker.check("https://endler.dev/abcd".into());
+        assert_eq!(valid, false);
+    }
+}