Generate management canister Candid file (#265)

* Generate management canister Candid file

* Adjust test description

* Update package-lock.json

package.json

@@ -204,6 +204,7 @@
     },
     "scripts": {
         "prepare": "husky install && cd rust && npm install",
+        "postinstall": "npm run generate",
         "lint": "eslint . --ext ts",
         "lint:fix": "npm run lint -- --fix",
         "format": "prettier --write src",
@@ -219,8 +220,9 @@
         "compile:browser": "esbuild ./src/browser.ts --bundle --outfile=out/browser.js --external:vscode --format=cjs --platform=node --minify",
         "compile:server": "esbuild ./src/server/server.ts --bundle --outfile=out/server.js --external:vscode --format=cjs --platform=node --minify",
         "compile:motoko": "esbuild motoko --bundle --outfile=out/motoko.js --format=cjs --platform=node --minify",
+        "generate": "node scripts/generate",
         "test": "jest",
-        "package": "vsce package && npm test && npm run --silent lint",
+        "package": "npm run generate && vsce package && npm test && npm run --silent lint",
         "publish": "vsce publish"
     },
     "lint-staged": {

scripts/generate.js

@@ -0,0 +1,39 @@
+const fs = require('fs');
+const path = require('path');
+const https = require('https');
+
+const generatedDirectory = path.join(__dirname, '../src/generated');
+if (!fs.existsSync(generatedDirectory)) {
+    fs.mkdirSync(generatedDirectory);
+}
+
+https
+    .get(
+        'https://raw.githubusercontent.com/dfinity/interface-spec/master/spec/_attachments/ic.did',
+        (response) => {
+            if (response.statusCode !== 200) {
+                throw new Error(
+                    `HTTP ${response.statusCode}: ${response.statusMessage}`,
+                );
+            }
+            const data = [];
+            response.on('data', (chunk) => data.push(chunk));
+            response.on('end', () => {
+                fs.writeFile(
+                    path.join(generatedDirectory, 'aaaaa-aa.did.ts'),
+                    `export default \`${data.join('')}\`;\n`,
+                    (err) => {
+                        if (err) {
+                            throw err;
+                        }
+                    },
+                );
+            });
+        },
+    )
+    .on('error', (err) => {
+        console.error(
+            'Error while downloading management canister Candid file:',
+        );
+        throw err;
+    });

src/server/server.spec.ts

@@ -0,0 +1,7 @@
+import icCandid from '../generated/aaaaa-aa.did';
+
+describe('server', () => {
+    test('generated IC Candid file has expected format', () => {
+        expect(icCandid).toContain('service ic : {\n');
+    });
+});

src/server/server.ts

@@ -82,7 +82,7 @@ import {
     resolveVirtualPath,
 } from './utils';
 import { pascalCase } from 'change-case';
-import icCandid from '../candid/aaaaa-aa.did';
+import icCandid from '../generated/aaaaa-aa.did';
 
 const errorCodes: Record<
     string,