chore: Adds check for license header (#3203)

* Adds check for license header

Signed-off-by: Konstantina Blazhukova <[email protected]>

* adds new header rule and removes conflict leftover

Signed-off-by: Konstantina Blazhukova <[email protected]>

* Adds regex for license header

Signed-off-by: Konstantina Blazhukova <[email protected]>

* finalizes regex for header

Signed-off-by: Konstantina Blazhukova <[email protected]>

* improves template

Signed-off-by: Konstantina Blazhukova <[email protected]>

---------

Signed-off-by: Konstantina Blazhukova <[email protected]>

Author: konstantinabl

.eslintrc.js

@@ -1,4 +1,4 @@
-/*
+/*-
  *
  * Hedera JSON RPC Relay
  *
@@ -28,7 +28,10 @@ module.exports = {
         "plugin:@typescript-eslint/recommended",
         "prettier",
     ],
-    "plugins": ["simple-import-sort"],
+    "plugins": [
+        "simple-import-sort",
+        "header",
+    ],
     "overrides": [
         {
             "env": {
@@ -64,5 +67,26 @@ module.exports = {
         }],
         "simple-import-sort/imports": "error",
         "simple-import-sort/exports": "off",
+        "header/header": [2, "block", [
+            "-",
+            " *",
+            " * Hedera JSON RPC Relay",
+            " *",
+            {"pattern": "^\\s\\*\\sCopyright \\(C\\) 20(1[8-9]|[2-9]\\d)(?:-20(1[8-9]|[2-9]\\d))? Hedera Hashgraph, LLC$", "template": ` * Copyright (C) ${new Date().getFullYear()} Hedera Hashgraph, LLC`},
+            " *",
+            " * Licensed under the Apache License, Version 2.0 (the \"License\");",
+            " * you may not use this file except in compliance with the License.",
+            " * You may obtain a copy of the License at",
+            " *",
+            " *      http://www.apache.org/licenses/LICENSE-2.0",
+            " *",
+            " * Unless required by applicable law or agreed to in writing, software",
+            " * distributed under the License is distributed on an \"AS IS\" BASIS,",
+            " * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.",
+            " * See the License for the specific language governing permissions and",
+            " * limitations under the License.",
+            " *",
+            " ",
+        ]],
     },
 };

package-lock.json

@@ -21,6 +21,7 @@
     "eslint-config-airbnb-base": "^15.0.0",
     "eslint-config-prettier": "^8.3.0",
     "eslint-config-standard-with-typescript": "^43.0.1",
+    "eslint-plugin-header": "^3.1.1",
     "eslint-plugin-import": "^2.28.1",
     "eslint-plugin-n": "^15.7.0",
     "eslint-plugin-simple-import-sort": "^12.1.1",