feat: add ignore file configuration

README.md

@@ -2,6 +2,15 @@
 
 A github action that compare a list of JSON files an return the missing keys between each other.
 
+## Action configurations
+
+| Input Name   | Description                                                                                                     | Required | Default            |
+|--------------|-----------------------------------------------------------------------------------------------------------------|----------|--------------------|
+| `files`      | List of JSON file paths to check between each other. Should be at least 2 files.                                 | `false`  | -                  |
+| `search_path`| Path to a folder that will be inspected to search all JSON files and compare each other.                         | `false`  | -                  |
+| `search_pattern` | Regular expression used on search path to find desired files.                                                  | `false`  | `\.json$`          |
+| `ignore_file`| Path to a specific ignore file configuration                                                                    | `false`  | `.json-diff-ignore.json` |
+
 ## Usage
 
 You can compare specific files using the next configuration:
@@ -28,3 +37,31 @@ Or if you want to search on a specific route you can use the next configuration:
 ```
 
 This will find on the specified route all files that match the `search_pattern` to compare each other
+
+### Ignore rules
+
+If you need to ignore some specific keys on certain files you can use an ignore json file on your project
+root. By the fault the name of this files is `.json-diff-ignore.json` and has this structure:
+
+```json
+[
+  {
+    "pattern": "regexp/file\\.json$",
+    "ignoreKeys": ["key1"]
+  },
+  {
+    "pattern": "regexp/file2\\.json$",
+    "ignoreKeys": ["key2"]
+  }
+]
+```
+
+If you what to specify a specific path to find the ignore file you can do that by adding the next configuration:
+
+```yml
+- name: Run JSON Diff Action
+  uses: Drafteame/json-diff-action@main
+  with:
+    # ...
+    ignore_file: /path/to/.json-diff-ignore.json
+```

action.yml

@@ -16,7 +16,13 @@ inputs:
     description: Regular expression used on search path to find desired files.
     required: false
     default: '\\.json$'
+  ignore_file:
+    description: Path to a specific ignore file configuration
+    required: false
+    default: '.json-diff-ignore.json'
 
 runs:
   using: "docker"
   image: "Dockerfile"
+
+

index.js

@@ -7,6 +7,7 @@ const main = () => {
     core.getInput("files"),
     core.getInput("search_path"),
     core.getInput("search_pattern"),
+    core.getInput("ignore_file"),
   );
 
   try {

src/Action.js

@@ -1,6 +1,7 @@
 import lodash from "lodash";
 import fs from "fs";
 import path from "path";
+import core from "@actions/core";
 
 import {
   NotEnoughFiles,
@@ -30,13 +31,25 @@ export default class Action {
    */
   #searchPattern;
 
+  /**
+   * Map with rules to ignore specified keys on specific files that match one or more patterns
+   * @type {Array<Object>}
+   */
+  #ignoreRules;
+
+  /**
+   * Object with the loaded ignore keys by file
+   * @type {Object}
+   */
+  #ignoreKeysByFile;
+
   /**
    * Final list of files after initial validations
    * @type {Array<string>}
    */
   #fileList;
 
-  constructor(files, searchPath, searchPattern) {
+  constructor(files, searchPath, searchPattern, ignoreFile) {
     this.#files = files;
     this.#searchPath = searchPath;
 
@@ -46,6 +59,9 @@ export default class Action {
       this.#searchPattern = searchPattern;
     }
 
+    this.#ignoreRules = this.#getIgnoreRules(ignoreFile);
+    this.#ignoreKeysByFile = {};
+
     this.#fileList = this.#validateInputs();
   }
 
@@ -58,6 +74,15 @@ export default class Action {
     return this.#fileList;
   }
 
+  /**
+   * Return the loaded ignore rules.
+   *
+   * @returns {Array<Object>}
+   */
+  getIgnoreRules() {
+    return this.#ignoreRules;
+  }
+
   /**
    * Execute comparison of file keys and return the found differences.
    *
@@ -94,6 +119,10 @@ export default class Action {
 
         keysFile2
           .filter((key) => {
+            if (this.#keyShouldBeIgnored(file1, key)) {
+              return false;
+            }
+
             const notInKeys1 = !keysFile1.includes(key);
             const notInMissing = !missing.includes(key);
 
@@ -237,4 +266,71 @@ export default class Action {
 
     return newPath;
   }
+
+  /**
+   * Return ignore file configuration to apply on checks
+   *
+   * @param {string} ignoreFile Path to the specified ignore file
+   *
+   * @return {Array<Object>}
+   */
+  #getIgnoreRules(ignoreFile) {
+    let file = ".json-diff-ignore.json";
+
+    if (!lodash.isEmpty(ignoreFile)) {
+      file = ignoreFile;
+    }
+
+    if (!fs.existsSync(file)) {
+      return [];
+    }
+
+    const content = fs.readFileSync(file, { encoding: "utf-8" });
+
+    try {
+      return JSON.parse(content);
+    } catch (e) {
+      core.info(
+        `Error reading ignore file from '${file}', no rules will be applied...'`,
+      );
+      return [];
+    }
+  }
+
+  /**
+   * Validate if a given key should be ignored or not by the given file.
+   *
+   * @param {string} file File that should ignore or not the given key if not present on it.
+   * @param {string} key Key that should be ignored or not by the file.
+   *
+   * @returns {boolean}
+   */
+  #keyShouldBeIgnored(file, key) {
+    if (file in this.#ignoreKeysByFile) {
+      return this.#ignoreKeysByFile[file].includes(key);
+    }
+
+    let keysToIgnore = [];
+
+    this.#ignoreRules.forEach((rule) => {
+      const pattern = rule.pattern || null;
+      const keys = rule.ignoreKeys || [];
+
+      if (lodash.isEmpty(pattern) || keys.length === 0) {
+        return;
+      }
+
+      const regexp = new RegExp(pattern);
+
+      if (regexp.test(file)) {
+        keys.forEach((item) => {
+          keysToIgnore.push(item);
+        });
+      }
+    });
+
+    this.#ignoreKeysByFile[file] = keysToIgnore;
+
+    return keysToIgnore.includes(key);
+  }
 }