commit 9373fe944d955b415ea68b4b069119ac6b43ac4f
Author: Daan Boerlage <d@boerlage.me>
Date:   Tue Nov 14 23:16:59 2023 +0100

    Initial commit

diff --git a/.gitignore b/.gitignore
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+ "windows_i686_gnu",
+ "windows_i686_msvc",
+ "windows_x86_64_gnu",
+ "windows_x86_64_gnullvm",
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+ "windows-sys",
+]
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..b7def21
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,19 @@
+[package]
+name = "sigv4"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+anyhow = "1"
+chrono = "0.4"
+hex = "0.4"
+hmac = "0.12"
+reqwest = { version = "0.11", default-features = false, features = ["json", "rustls-tls", "gzip"] }
+serde_json = "1"
+serde = { version = "1", features = ["derive"]}
+sha2 = "0.10"
+tokio = { version = "1", features = ["full"] }
+tracing = "0.1"
+tracing-subscriber = { version = "0.3", features = ["env-filter", "json"]}
+url = "2"
+urlencoding = "2"
\ No newline at end of file
diff --git a/readme.md b/readme.md
new file mode 100644
index 0000000..3f74679
--- /dev/null
+++ b/readme.md
@@ -0,0 +1,5 @@
+# AWS-SIG-V4
+
+Attempt at manually implementing aws-sig-v4
+
+https://docs.aws.amazon.com/AmazonS3/latest/API/sig-v4-authenticating-requests.html
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..362e82f
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,50 @@
+mod request_builder;
+mod types;
+
+use crate::types::AwsRegion;
+use request_builder::RequestBuilder;
+use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt, EnvFilter};
+
+const LOG_FILTER: &str = "DEBUG,rustls=INFO,hyper::proto=INFO";
+
+#[tokio::main]
+async fn main() -> anyhow::Result<()> {
+    tracing_subscriber::registry()
+        .with(EnvFilter::try_from_default_env().unwrap_or(LOG_FILTER.into()))
+        .with(tracing_subscriber::fmt::layer().pretty())
+        .init();
+
+    let access_id = match std::env::var("AWS_ACCESS_KEY_ID") {
+        Ok(x) => x,
+        Err(_) => panic!("Missing environment variable 'AWS_ACCESS_KEY_ID'"),
+    };
+
+    let access_key = match std::env::var("AWS_SECRET_ACCESS_KEY") {
+        Ok(x) => x,
+        Err(_) => panic!("Missing environment variable 'AWS_SECRET_ACCESS_KEY'"),
+    };
+
+    list_buckets(access_id, access_key).await?;
+
+    Ok(())
+}
+
+async fn list_buckets(access_id: String, access_key: String) -> anyhow::Result<()> {
+    let req = RequestBuilder::new(
+        access_id,
+        access_key,
+        "https://s3.amazonaws.com/".to_string(),
+        AwsRegion::UsEast1,
+    );
+
+    let response = req.send().await;
+
+    match response {
+        Ok(x) => {
+            println!("{}", x.text().await?)
+        }
+        Err(x) => println!("{:?}", x),
+    }
+
+    Ok(())
+}
diff --git a/src/request_builder.rs b/src/request_builder.rs
new file mode 100644
index 0000000..7a610bc
--- /dev/null
+++ b/src/request_builder.rs
@@ -0,0 +1,183 @@
+use crate::types::{AwsRegion, AwsService, HttpVerbs};
+use chrono::prelude::*;
+use hmac::{Hmac, Mac};
+use reqwest::header::{HeaderMap, HeaderName};
+use reqwest::Client;
+use sha2::{Digest, Sha256};
+use std::collections::HashMap;
+use url::Url;
+
+pub struct RequestBuilder {
+    http_verb: HttpVerbs,
+    now_long: String,
+    now_short: String,
+    access_key_id: String,
+    access_key_secret: String,
+    url: Url,
+    headers: HashMap<String, String>,
+    region: AwsRegion,
+    service: AwsService,
+}
+
+impl RequestBuilder {
+    pub fn new(
+        access_key_id: String,
+        access_key_secret: String,
+        endpoint: String,
+        aws_region: AwsRegion,
+    ) -> Self {
+        let url = Url::parse(&endpoint).expect("invalid endpoint format");
+
+        let now: DateTime<Utc> = Utc::now();
+        let now_long = now.format("%Y%m%dT%H%M%SZ").to_string();
+        let now_short = now.format("%Y%m%d").to_string();
+
+        let mut default_headers = HashMap::<String, String>::new();
+        default_headers.insert(
+            "host".to_string(),
+            url.host().expect("missing host").to_string(),
+        );
+        default_headers.insert("x-amz-date".to_string(), now_long.clone());
+        default_headers.insert("x-amz-content-sha256".to_string(), hash("".to_string()));
+
+        Self {
+            http_verb: HttpVerbs::Get,
+            now_short,
+            now_long,
+            access_key_id,
+            access_key_secret,
+            url,
+            headers: default_headers,
+            region: aws_region,
+            service: AwsService::S3,
+        }
+    }
+
+    fn get_scope(&self) -> String {
+        format!(
+            "{}/{}/{}/aws4_request",
+            self.now_short, self.region, self.service
+        )
+    }
+
+    fn get_signing_key(&self) -> Vec<u8> {
+        let date_key = digest_raw(
+            format!("AWS4{}", self.access_key_secret).into_bytes(),
+            &self.now_short,
+        );
+        let date_region_key = digest_raw(date_key, &self.region.to_string());
+        let date_region_service_key = digest_raw(date_region_key, &self.service.to_string());
+        digest_raw(date_region_service_key, "aws4_request")
+    }
+
+    fn get_canonical_request(&self) -> String {
+        let qs = self
+            .url
+            .query_pairs()
+            .into_iter()
+            .map(|(key, val)| {
+                format!(
+                    "{}={}",
+                    urlencoding::encode(&key),
+                    urlencoding::encode(&val)
+                )
+            })
+            .collect::<Vec<String>>()
+            .join("&");
+
+        let mut headers = self
+            .headers
+            .clone()
+            .into_iter()
+            .map(|(key, val)| format!("{}:{}", key.to_lowercase(), val.trim()))
+            .collect::<Vec<String>>();
+        headers.sort();
+        let headers = headers.join("\n");
+
+        let mut signed_headers = self.headers.clone().into_keys().collect::<Vec<String>>();
+        signed_headers.sort();
+        let signed_headers = signed_headers.join(";");
+
+        let canonical_request = format!(
+            "{}\n{}\n{}\n{}\n\n{}\n{}",
+            self.http_verb,
+            self.url.path(),
+            qs,
+            headers,
+            signed_headers,
+            hash("".to_string())
+        );
+
+        canonical_request
+    }
+
+    fn get_signature(&self) -> String {
+        let canon = hash(self.get_canonical_request());
+
+        let unsigned = format!(
+            "AWS4-HMAC-SHA256\n{}\n{}\n{}",
+            self.now_long,
+            self.get_scope(),
+            canon
+        );
+
+        hex::encode(digest_raw(self.get_signing_key(), &unsigned))
+    }
+
+    pub fn get_authorization_header(&self) -> String {
+        let mut signed_headers = self.headers.clone().into_keys().collect::<Vec<String>>();
+        signed_headers.sort();
+        let signed_headers = signed_headers.join(";");
+        format!(
+            "AWS4-HMAC-SHA256 Credential={}/{},SignedHeaders={},Signature={}",
+            self.access_key_id,
+            self.get_scope(),
+            signed_headers,
+            self.get_signature()
+        )
+    }
+
+    fn get_header_map(&self) -> HeaderMap {
+        let mut header_map = HeaderMap::new();
+        self.headers.iter().for_each(|(key, val)| {
+            header_map.insert(
+                HeaderName::try_from(key).expect("unknown header"),
+                val.parse().unwrap(),
+            );
+        });
+        header_map.insert(
+            reqwest::header::USER_AGENT,
+            "sigv4-test/0.1.0".parse().unwrap(),
+        );
+        header_map.insert(
+            reqwest::header::AUTHORIZATION,
+            self.get_authorization_header().parse().unwrap(),
+        );
+
+        header_map
+    }
+
+    pub async fn send(&self) -> Result<reqwest::Response, reqwest::Error> {
+        let header_map = self.get_header_map();
+
+        Client::new()
+            .get(self.url.to_string())
+            .headers(header_map)
+            .send()
+            .await
+    }
+}
+
+fn hash(val: String) -> String {
+    let mut hasher = Sha256::new();
+    hasher.update(val.as_bytes());
+    hex::encode(hasher.finalize())
+}
+
+fn digest_raw(key: Vec<u8>, val: &str) -> Vec<u8> {
+    let mut mac =
+        Hmac::<Sha256>::new_from_slice(key.as_slice()).expect("HMAC can take key of any size");
+    mac.update(val.as_bytes());
+
+    mac.finalize().into_bytes().to_vec()
+}
diff --git a/src/types.rs b/src/types.rs
new file mode 100644
index 0000000..3a28ea7
--- /dev/null
+++ b/src/types.rs
@@ -0,0 +1,40 @@
+use std::fmt::{Display, Formatter};
+
+#[derive(Copy, Clone, Debug, Ord, PartialOrd, Eq, PartialEq)]
+pub enum AwsRegion {
+    UsEast1,
+}
+
+impl Display for AwsRegion {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        match self {
+            AwsRegion::UsEast1 => write!(f, "us-east-1"),
+        }
+    }
+}
+
+#[derive(Copy, Clone, Debug, Ord, PartialOrd, Eq, PartialEq)]
+pub enum AwsService {
+    S3,
+}
+
+impl Display for AwsService {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        match self {
+            AwsService::S3 => write!(f, "s3"),
+        }
+    }
+}
+
+#[derive(Copy, Clone, Debug, Ord, PartialOrd, Eq, PartialEq)]
+pub enum HttpVerbs {
+    Get,
+}
+
+impl Display for HttpVerbs {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        match self {
+            HttpVerbs::Get => write!(f, "GET"),
+        }
+    }
+}