Add an implementation of a VC issuer (#2057)

* Add an implementation of a VC issuer.

* Remove commmented out deps, fix an URL

* Fix an issuer bug, extend a test

* Document issuer's candid interface

* Address review comments

* Update demos/vc_issuer/build.sh

Co-authored-by: Nicolas Mattia <[email protected]>

* +=prettier

* fix vc_issuer/build.sh

---------

Co-authored-by: Nicolas Mattia <[email protected]>

demos/vc_issuer/Cargo.toml

@@ -0,0 +1,37 @@
+[workspace]
+
+[package]
+name = "vc_issuer"
+description = "Verifiable Credentials Issuer"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+# local dependencies
+canister_sig_util = { path = "../../src/canister_sig_util" }
+internet_identity_interface = { path = "../../src/internet_identity_interface" }
+vc_util = { path = "../../src/vc_util" }
+# ic dependencies
+candid = "0.9"
+ic-cdk = "0.10"
+ic-cdk-macros = "0.7"
+ic-certified-map = "0.4"
+ic-stable-structures = "0.6.0"
+# vc dependencies
+identity_core = { git = "https://github.com/frederikrothenberger/identity.rs.git", branch = "frederik/wasm-test", default-features = false}
+identity_credential = {git = "https://github.com/frederikrothenberger/identity.rs.git", branch = "frederik/wasm-test", default-features = false, features = ["credential"]}
+identity_jose = { git = "https://github.com/frederikrothenberger/identity.rs.git", branch = "frederik/wasm-test", default-features = false, features = ["iccs"]}
+
+# other dependencies
+hex = "0.4"
+serde = { version = "1", features = ["derive"] }
+serde_bytes = "0.11"
+serde_cbor = "0.11"
+serde_json = "1"
+sha2 = "^0.10" # set bound to match ic-certified-map bound
+
+[dev-dependencies]
+assert_matches = "1.5.0"
+ic-test-state-machine-client = "3"
+canister_tests = { path = "../../src/canister_tests" }
+lazy_static = "1.4"

demos/vc_issuer/README.md

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+# An example issuer of verifiable credentials
+
+This is an example implementation of an issuer of verifiable credentials for
+the [attribute sharing flow on the IC](https://github.com/dfinity/wg-identity-authentication/blob/main/topics/attribute-sharing.md).
+
+## Supported Behavior
+
+The app implements the interface of the issuer from [the spec](../../docs/vc-spec.md), plus some additional
+APIs for configuring and testing, cf. [vc_issuer.did](./vc_issuer.did).
+Please note that this issuer is for demonstrating the use of issuer APIS, and is **not meant
+for real-world deployment**, as it does not have proper management of user data.
+
+## Development
+
+Run `./build.sh` script to build the issuer canister.

demos/vc_issuer/build.sh

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+#!/usr/bin/env bash
+set -euo pipefail
+
+
+# Make sure we always run from the issuer root
+VC_ISSUER_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+cd "$VC_ISSUER_DIR"
+
+cargo build --release --target wasm32-unknown-unknown --manifest-path ./Cargo.toml -j1
+ic-wasm "target/wasm32-unknown-unknown/release/vc_issuer.wasm" -o "./vc_issuer.wasm" shrink
+ic-wasm vc_issuer.wasm -o vc_issuer.wasm metadata candid:service -f vc_issuer.did -v public
+gzip --no-name --force "vc_issuer.wasm"
+

demos/vc_issuer/dfx.json

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+{
+  "canisters": {
+    "internet_identity": {
+      "type": "custom",
+      "candid": "../../src/internet_identity/internet_identity.did",
+      "wasm": "../../internet_identity.wasm.gz",
+
+      "remote": {
+        "id": {
+          "ic": "rdmx6-jaaaa-aaaaa-aaadq-cai"
+        }
+      }
+    },
+
+    "issuer": {
+      "type": "custom",
+      "candid": "vc_issuer.did",
+      "wasm": "vc_issuer.wasm.gz",
+      "build": "./build.sh"
+    }
+  },
+  "defaults": {
+    "build": {
+      "packtool": ""
+    }
+  },
+  "version": 1
+}