From 4e79ab051917fece21fcec0bd31cc2942462fda0 Mon Sep 17 00:00:00 2001
From: Melody Horn <melody@boringcactus.com>
Date: Sat, 27 Mar 2021 09:02:59 -0600
Subject: rough draft

---
 .gitignore      |   1 +
 Cargo.lock      | 749 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml      |  16 ++
 src/download.rs |  46 ++++
 src/main.rs     |  39 +++
 5 files changed, 851 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 src/download.rs
 create mode 100644 src/main.rs

diff --git a/.gitignore b/.gitignore
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+ "bytes",
+ "libc",
+ "memchr",
+ "mio",
+ "num_cpus",
+ "once_cell",
+ "parking_lot",
+ "pin-project-lite",
+ "signal-hook-registry",
+ "tokio-macros",
+ "winapi",
+]
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+ "log",
+ "try-lock",
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+
+[[package]]
+name = "webget"
+version = "0.1.0"
+dependencies = [
+ "anyhow",
+ "fehler",
+ "futures",
+ "hyper",
+ "mime2ext",
+ "structopt",
+ "tokio",
+]
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+[[package]]
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+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
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+[[package]]
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+[[package]]
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..b34c1c5
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,16 @@
+[package]
+name = "webget"
+version = "0.1.0"
+authors = ["Melody Horn <melody@boringcactus.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+anyhow = "1"
+fehler = "1"
+futures = "0.3.13"
+hyper = { version = "0.14.5", features = ["client", "http1", "runtime", "stream"] }
+mime2ext = "0.1.2"
+tokio = { version = "1", features = ["full"] }
+structopt = "0.3.21"
diff --git a/src/download.rs b/src/download.rs
new file mode 100644
index 0000000..537dae3
--- /dev/null
+++ b/src/download.rs
@@ -0,0 +1,46 @@
+use std::path::{Path, PathBuf};
+
+use anyhow::Error;
+use fehler::throws;
+use hyper::{body::HttpBody, Client, header::CONTENT_TYPE, Uri};
+use tokio::fs;
+use tokio::io::AsyncWriteExt;
+
+use super::Args;
+
+#[throws]
+pub(crate) async fn download(url: Uri, args: &Args) {
+    let output_file_path = if let Some(output) = &args.output_document {
+        Some(output.clone())
+    } else {
+        let url_path = Path::new(url.path());
+        match (url_path.file_name(), url.path().ends_with('/')) {
+            (Some(file_name), false) => Some(PathBuf::from(file_name)),
+            _ => None,
+        }
+    };
+
+    let client = Client::new();
+    let mut response = client.get(url.clone()).await?;
+    if !response.status().is_success() {
+        panic!("non-success response code {} in URL {}", response.status(), url);
+    }
+
+    let output_file_path = if let Some(path) = output_file_path {
+        path
+    } else {
+        let content_type = response.headers().get(CONTENT_TYPE);
+        let extension = content_type
+            .and_then(|mime_type| mime_type.to_str().ok())
+            .and_then(|mime_type| mime2ext::mime2ext(mime_type))
+            .map(|x| format!(".{}", x))
+            .unwrap_or_default();
+        PathBuf::from(format!("index{}", extension))
+    };
+
+    let mut output_file = fs::File::create(output_file_path).await.expect("couldn't open output file!");
+
+    while let Some(data) = response.body_mut().data().await {
+        output_file.write_all(&data?).await?;
+    }
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..da1ae1f
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,39 @@
+use std::mem;
+use std::path::PathBuf;
+
+use anyhow::Error;
+use hyper::Uri;
+use structopt::StructOpt;
+
+mod download;
+use download::download;
+
+#[derive(StructOpt, Debug)]
+struct Args {
+    /// Specify output filename (will cause an error if multiple URLs are given)
+    #[structopt(short = "O", long)]
+    output_document: Option<PathBuf>,
+
+    /// The URLs to download
+    urls: Vec<Uri>,
+}
+
+#[tokio::main]
+async fn main() -> Result<(), Error> {
+    let (args, urls) = {
+        let mut args: Args = Args::from_args();
+        let urls = mem::take(&mut args.urls);
+        (args, urls)
+    };
+    if urls.len() != 1 && args.output_document.is_some() {
+        panic!("can't use the same output file for multiple URLs!")
+    }
+
+    let download_handles = urls
+        .into_iter()
+        .map(|url| download(url, &args));
+    let downloads = futures::future::join_all(download_handles);
+    let _downloads = downloads.await;
+
+    Ok(())
+}
-- 
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