Replace Go script with Node.js implementation

6 files changed, 79 insertions, 68 deletions

diff --git a/CHANGELOG.md b/CHANGELOG.md
index d955eb8..fb46543 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -19,6 +19,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   script for `server` in `package.json`. This change addresses a deprecation
   warning introduced in Hugo v0.114.0, ensuring compatibility with future versions
   of Hugo.
+- Replace Go script with Node.js implementation for Netlify redirects patching
+  for Deploy Preview context. This change aims to eliminate the dependency on Go
+  for the theme's development environment, and streamline the project's technology
+  stack.
 
 ### Fixed
 
diff --git a/eslint.config.js b/eslint.config.js
index 054bd46..93ee895 100644
--- a/eslint.config.js
+++ b/eslint.config.js
@@ -112,5 +112,19 @@ module.exports = [
         ...globals.node
       }
     }
+  },
+  {
+    files: ['netlify-preview.js'],
+    rules: {
+      // allow use of console
+      'no-console': 'off'
+    },
+    languageOptions: {
+      'sourceType': 'commonjs',
+      globals: {
+        // Browser global variables
+        ...globals.node
+      }
+    }
   }
 ];
diff --git a/netlify-pr.go b/netlify-pr.go
deleted file mode 100644
index 58fac5d..0000000
--- a/netlify-pr.go
+++ /dev/null
@@ -1,66 +0,0 @@
-package main
-
-// Path netlify.toml file for Netlify Deploy Preview to allow some
-// violation for CSP header.
-
-import (
-	"fmt"
-	"log"
-	"os"
-	"regexp"
-	"strings"
-)
-
-const netlifyConfig = "netlify.toml"
-
-func main() {
-	input, err := os.ReadFile(netlifyConfig)
-	if err != nil {
-		log.Fatalln(err)
-	}
-
-	lines := strings.Split(string(input), "\n")
-	for i, line := range lines {
-		newStr := line
-
-		// -> default-src 'self';
-		// <- default-src 'self' blob:;
-		reStr := regexp.MustCompile("(default-src) ('self')(;)")
-		repStr := "${1} ${2} blob:${3}"
-		newStr = reStr.ReplaceAllString(newStr, repStr)
-
-		// -> style-src 'self' cdn.hypothes.is;
-		// <- style-src 'self' 'unsafe-inline' cdn.hypothes.is;
-		reStr = regexp.MustCompile(`(style-src) ('self') (cdn\.hypothes\.is)(;)`)
-		repStr = "${1} ${2} ${3} 'unsafe-inline'${4}"
-		newStr = reStr.ReplaceAllString(newStr, repStr)
-
-		// -> media-src 'self';
-		// <- media-src 'self' blob: https://app.netlify.com;
-		reStr = regexp.MustCompile("(media-src) ('self')(;)")
-		repStr = "${1} ${2} blob: https://app.netlify.com${3}"
-		newStr = reStr.ReplaceAllString(newStr, repStr)
-
-		// -> frame-src hypothes.is;
-		// <- frame-src hypothes.is app.netlify.com;
-		reStr = regexp.MustCompile(`(frame-src) (hypothes\.is)(;)`)
-		repStr = "${1} ${2} app.netlify.com${3}"
-		newStr = reStr.ReplaceAllString(newStr, repStr)
-
-		// -> script-src 'self' www.googletagmanager.com hypothes.is cdn.hypothes.is;
-		// <- script-src 'self' www.googletagmanager.com hypothes.is cdn.hypothes.is netlify-cdp-loader.netlify.app;
-		reStr = regexp.MustCompile(`(script-src) ('self' www\.googletagmanager\.com hypothes\.is cdn\.hypothes\.is)(;)`)
-		repStr = "${1} ${2} netlify-cdp-loader.netlify.app${3}"
-		newStr = reStr.ReplaceAllString(newStr, repStr)
-
-		lines[i] = newStr
-	}
-
-	output := strings.Join(lines, "\n")
-	err = os.WriteFile(netlifyConfig, []byte(output), 0644)
-	if err != nil {
-		log.Fatalln(err)
-	}
-
-	fmt.Println("Done")
-}
diff --git a/netlify-preview.js b/netlify-preview.js
new file mode 100644
index 0000000..5b37433
--- /dev/null
+++ b/netlify-preview.js
@@ -0,0 +1,58 @@
+'use strict';
+
+const fs = require('fs');
+const path = require('path');
+
+const netlifyConfig = 'netlify.toml';
+
+// Read the netlify.toml file
+fs.readFile(path.resolve(__dirname, netlifyConfig), 'utf8', (err, data) => {
+  if (err) {
+    console.error('Error reading file: ', err);
+    return;
+  }
+
+  // Split the file content into lines
+  const lines = data.split('\n');
+
+  // Process each line
+  const processedLines = lines.map((line) => {
+    // -> default-src 'self';
+    // <- default-src 'self' blob:;
+    line = line.replace(/(default-src) ('self')(;)/, '$1 $2 blob:$3');
+
+    // -> style-src 'self' cdn.hypothes.is;
+    // <- style-src 'self' 'unsafe-inline' cdn.hypothes.is;
+    line = line.replace(/(style-src) ('self') (cdn\.hypothes\.is)(;)/, '$1 $2 $3 \'unsafe-inline\'$4');
+
+    // -> media-src 'self';
+    // <- media-src 'self' blob: https://app.netlify.com;
+    line = line.replace(/(media-src) ('self')(;)/, '$1 $2 blob: https://app.netlify.com$3');
+
+    // -> frame-src hypothes.is;
+    // <- frame-src hypothes.is app.netlify.com;
+    line = line.replace(/(frame-src) (hypothes\.is)(;)/, '$1 $2 app.netlify.com$3');
+
+    // -> script-src 'self' www.googletagmanager.com hypothes.is cdn.hypothes.is;
+    // <- script-src 'self' www.googletagmanager.com hypothes.is cdn.hypothes.is netlify-cdp-loader.netlify.app;
+    line = line.replace(
+      /(script-src) ('self' www\.googletagmanager\.com hypothes\.is cdn\.hypothes\.is)(;)/,
+      '$1 $2 netlify-cdp-loader.netlify.app$3'
+    );
+
+    return line;
+  });
+
+  // Join the processed lines back into a single string
+  const output = processedLines.join('\n');
+
+  // Write the modified content back to the file
+  fs.writeFile(path.resolve(__dirname, netlifyConfig), output, 'utf8', (err) => {
+    if (err) {
+      console.error('Error writing file:', err);
+      return;
+    }
+
+    console.log('Done');
+  });
+});
diff --git a/netlify.toml b/netlify.toml
index c14d827..55134eb 100644
--- a/netlify.toml
+++ b/netlify.toml
@@ -27,7 +27,7 @@
 # Deploy Preview context: all deploys generated from
 # a pull/merge request will inherit these settings.
 [context.deploy-preview]
-  command = 'go run netlify-pr.go; hugo --source=exampleSite --buildDrafts --buildFuture --baseURL ${DEPLOY_PRIME_URL} --destination ../public --minify'
+  command = 'npm run netlify-preview; hugo --source=exampleSite --buildDrafts --buildFuture --baseURL ${DEPLOY_PRIME_URL} --destination ../public --minify'
 
 [context.deploy-preview.environment]
   HUGO_ENV = 'development'
diff --git a/package.json b/package.json
index c177bf8..f79ee7c 100644
--- a/package.json
+++ b/package.json
@@ -24,7 +24,8 @@
     "test": "playwright test",
     "lint": "npm run lint:js && npm run lint:editorconfig",
     "lint:editorconfig": "editorconfig-checker",
-    "lint:js": "eslint static/js/* assets/js/* tests/*.spec.js eslint.config.js playwright.config.js"
+    "lint:js": "eslint static/js/* assets/js/* tests/*.spec.js eslint.config.js playwright.config.js netlify-preview.js",
+    "netlify-preview": "node netlify-preview.js"
   },
   "devDependencies": {
     "@playwright/test": "^1.43.0",