Move DirectUrl into pypi-types (#343)

This needs to be reused elsewhere, and there's nothing specific to wheel
installation about it.

crates/pypi-types/src/direct_url.rs

@@ -0,0 +1,59 @@
+use std::collections::HashMap;
+use std::path::PathBuf;
+
+use serde::{Deserialize, Serialize};
+
+/// Metadata for a distribution that was installed via a direct URL.
+///
+/// See: <https://packaging.python.org/en/latest/specifications/direct-url-data-structure/>
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(rename_all = "snake_case")]
+pub enum DirectUrl {
+    /// The direct URL is a path to an archive. For example:
+    /// ```json
+    /// {"archive_info": {"hash": "sha256=75909db2664838d015e3d9139004ee16711748a52c8f336b52882266540215d8", "hashes": {"sha256": "75909db2664838d015e3d9139004ee16711748a52c8f336b52882266540215d8"}}, "url": "https://files.pythonhosted.org/packages/b8/8b/31273bf66016be6ad22bb7345c37ff350276cfd46e389a0c2ac5da9d9073/wheel-0.41.2-py3-none-any.whl"}
+    /// ```
+    ArchiveUrl {
+        url: String,
+        archive_info: ArchiveInfo,
+        #[serde(skip_serializing_if = "Option::is_none")]
+        subdirectory: Option<PathBuf>,
+    },
+    /// The direct URL is path to a VCS repository. For example:
+    /// ```json
+    /// {"url": "https://github.com/pallets/flask.git", "vcs_info": {"commit_id": "8d9519df093864ff90ca446d4af2dc8facd3c542", "vcs": "git"}}
+    /// ```
+    VcsUrl {
+        url: String,
+        vcs_info: VcsInfo,
+        #[serde(skip_serializing_if = "Option::is_none")]
+        subdirectory: Option<PathBuf>,
+    },
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(rename_all = "snake_case")]
+pub struct ArchiveInfo {
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub hash: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub hashes: Option<HashMap<String, String>>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(rename_all = "snake_case")]
+pub struct VcsInfo {
+    pub vcs: VcsKind,
+    pub commit_id: String,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub requested_revision: Option<String>,
+}
+
+#[derive(Debug, Copy, Clone, Serialize, Deserialize)]
+#[serde(rename_all = "snake_case")]
+pub enum VcsKind {
+    Git,
+    Hg,
+    Bzr,
+    Svn,
+}

crates/pypi-types/src/lib.rs

@@ -1,5 +1,7 @@
+pub use direct_url::DirectUrl;
 pub use metadata::{Error, Metadata21};
 pub use simple_json::{File, SimpleJson};
 
+mod direct_url;
 mod metadata;
 mod simple_json;