From 3b8b4b940fdbbf1be5b851f0c78cfd3b14ad98f9 Mon Sep 17 00:00:00 2001
From: Jiahao XU <Jiahao_XU@outlook.com>
Date: Sun, 1 Oct 2023 23:26:01 +1100
Subject: [PATCH] Add initial data structure for `dist-manifest.json`

Signed-off-by: Jiahao XU <Jiahao_XU@outlook.com>
---
 Cargo.lock                                    |  1 +
 crates/binstalk-fetchers/Cargo.toml           |  3 +-
 .../src/dist_manifest_fetcher.rs              | 51 +++++++++++++++++++
 crates/binstalk-fetchers/src/lib.rs           |  5 ++
 4 files changed, 59 insertions(+), 1 deletion(-)
 create mode 100644 crates/binstalk-fetchers/src/dist_manifest_fetcher.rs

diff --git a/Cargo.lock b/Cargo.lock
index e2eb3740..634ad0d1 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -303,6 +303,7 @@ dependencies = [
  "miette",
  "minisign-verify",
  "once_cell",
+ "serde",
  "strum",
  "thiserror",
  "tokio",
diff --git a/crates/binstalk-fetchers/Cargo.toml b/crates/binstalk-fetchers/Cargo.toml
index 1f2b17c6..947e7c74 100644
--- a/crates/binstalk-fetchers/Cargo.toml
+++ b/crates/binstalk-fetchers/Cargo.toml
@@ -24,6 +24,7 @@ leon-macros = { version = "1.0.0", path = "../leon-macros" }
 miette = "5.9.0"
 minisign-verify = "0.2.1"
 once_cell = "1.18.0"
+serde = { version = "1.0.163", optional = true }
 strum = "0.25.0"
 thiserror = "1.0.52"
 tokio = { version = "1.35.0", features = ["rt", "sync"], default-features = false }
@@ -35,7 +36,7 @@ binstalk-downloader = { version = "0.9.6", path = "../binstalk-downloader" }
 
 [features]
 quickinstall = []
-dist-manifest = ["dep:cargo-dist-schema"]
+dist-manifest = ["dep:cargo-dist-schema", "dep:serde"]
 
 [package.metadata.docs.rs]
 rustdoc-args = ["--cfg", "docsrs"]
diff --git a/crates/binstalk-fetchers/src/dist_manifest_fetcher.rs b/crates/binstalk-fetchers/src/dist_manifest_fetcher.rs
new file mode 100644
index 00000000..ed7639d0
--- /dev/null
+++ b/crates/binstalk-fetchers/src/dist_manifest_fetcher.rs
@@ -0,0 +1,51 @@
+use std::collections::BTreeMap;
+
+use binstalk_downloader::remote::{Client, Response};
+use cargo_dist_schema::Format;
+use compact_str::CompactString;
+
+use crate::FetchError;
+
+#[derive(Clone, Debug)]
+struct Binary {
+    /// Key: target, value: artifact
+    artifacts: BTreeMap<CompactString, Artifact>,
+}
+
+/// An tarball/zip artifact.
+#[derive(Clone, Debug)]
+struct Artifact {
+    /// Filename of artifact on release artifacts,
+    /// need to infer the format.
+    filename: CompactString,
+    /// Path to the executable within the tarbal/zip.
+    path_to_exe: CompactString,
+
+    /// Filename of the checksum file.
+    checksum_filename: Option<CompactString>,
+}
+
+#[derive(Clone, Debug)]
+pub(super) enum DistManifest {
+    NotSupported(Format),
+    /// Key: name of the binary
+    Binaries(BTreeMap<CompactString, Binary>),
+}
+
+impl DistManifest {
+    async fn parse(response: Response) -> Result<Self, FetchError> {
+        let manifest: cargo_dist_schema::DistManifest = response.json().await?;
+        let format = manifest.format();
+
+        if format.unsupported() {
+            return Ok(Self::NotSupported(format));
+        }
+
+        todo!()
+    }
+}
+
+// TODO: Cache `DistManifest` in a new global http cacher for the fetchers
+// Also cache the artifacts downloaded and extracted
+
+pub struct GhDistManifest {}
diff --git a/crates/binstalk-fetchers/src/lib.rs b/crates/binstalk-fetchers/src/lib.rs
index a742e87e..019993b1 100644
--- a/crates/binstalk-fetchers/src/lib.rs
+++ b/crates/binstalk-fetchers/src/lib.rs
@@ -18,6 +18,11 @@ mod quickinstall;
 #[cfg(feature = "quickinstall")]
 pub use quickinstall::*;
 
+#[cfg(feature = "dist-manifest")]
+mod dist_manifest_fetcher;
+#[cfg(feature = "dist-manifest")]
+pub use dist_manifest_fetcher::GhDistManifest;
+
 mod common;
 use common::*;