docker-registry 0.9.0

A pure-Rust asynchronous library for Docker Registry HTTP API v2
Documentation 
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use std::collections::HashMap;

use serde::{Deserialize, Serialize};

/// Manifest version 2 schema 1, signed.
///
/// Specification is at <https://docs.docker.com/registry/spec/manifest-v2-1/>.
#[derive(Clone, Debug, Default, Deserialize, Serialize)]
pub struct ManifestSchema1Signed {
  #[serde(rename = "schemaVersion")]
  schema_version: u16,
  pub name: String,
  pub tag: String,
  pub architecture: String,
  #[serde(rename = "fsLayers")]
  fs_layers: Vec<S1Layer>,
  history: Vec<V1Compat>,
  signatures: Vec<Signature>,
}

#[derive(Clone, Debug, Default, Deserialize, Serialize)]
struct Signature {
  // TODO(lucab): switch to jsonwebtokens crate
  // https://github.com/Keats/rust-jwt/pull/23
  header: serde_json::Value,
  signature: String,
  protected: String,
}

/// Compatibility entry for version 1 manifest interoperability.
#[derive(Clone, Debug, Deserialize, Serialize)]
struct V1Compat {
  #[serde(rename = "v1Compatibility")]
  v1_compat: String,
}

#[derive(Clone, Debug, Deserialize, Serialize)]
struct S1Layer {
  #[serde(rename = "blobSum")]
  blob_sum: String,
}

impl ManifestSchema1Signed {
  /// List digests of all layers referenced by this manifest.
  ///
  /// The returned layers list is ordered starting with the base image first.
  pub fn get_layers(&self) -> Vec<String> {
    self.fs_layers.iter().rev().map(|l| l.blob_sum.clone()).collect()
  }

  /// Get a collection of all image labels stored in the history array of this manifest.
  ///
  /// Note that for this manifest type any `layer` beyond 0 probably returns None.
  pub fn get_labels(&self, layer: usize) -> Option<HashMap<String, String>> {
    Some(
      serde_json::from_str::<serde_json::Value>(&self.history.get(layer)?.v1_compat)
        .ok()?
        .get("config")?
        .get("Labels")?
        .as_object()?
        .into_iter()
        .filter_map(|(label, value)| Some((label.to_owned(), value.as_str()?.to_owned())))
        .collect(),
    )
  }
}