fix: JSON.load_file support for ruby 2.X

docs/CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## [Unreleased]
 
+Fixes:
+
+- `JSON.load_file()` is only available since Ruby 3.0 so `Utils.json_load_file()` was created to bring compatibility with Ruby 2.X
+
 ## [1.3.0]
 
 Additions:

lib/tls_map/extractor.rb

@@ -97,7 +97,7 @@ class << self
           #   See {TLSmap::App::Extractor}
           # @return [Array<String>] Cipher array (IANA names)
           def parse(file)
-            data = JSON.load_file(file)
+            data = Utils.json_load_file(file)
             extract_cipher(data)
           end
 
@@ -164,7 +164,7 @@ class << self
           #   See {TLSmap::App::Extractor}
           # @return [Array<String>] Cipher array (IANA names)
           def parse(file)
-            data = JSON.load_file(file)
+            data = Utils.json_load_file(file)
             extract_cipher(data)
           end
 
@@ -214,7 +214,7 @@ class << self
           #   See {TLSmap::App::Extractor}
           # @return [Array<String>] Cipher array (IANA names)
           def parse(file)
-            data = JSON.load_file(file)
+            data = Utils.json_load_file(file)
             extract_cipher(data)
           end
 

lib/tls_map/utils.rb

@@ -3,6 +3,7 @@
 # Ruby internal
 require 'net/http'
 require 'tempfile'
+require 'json'
 
 # TLS map module
 module TLSmap
@@ -14,6 +15,16 @@ def tmpfile(name, url)
       tmp.close
       tmp
     end
+
+    # bring JSON.load_file before ruby 3.0.0
+    # https://ruby-doc.org/stdlib-3.0.0/libdoc/json/rdoc/JSON.html#method-i-load_file
+    def self.json_load_file(filespec, opts = {})
+      if RUBY_VERSION < '3.0.0'
+        JSON.parse(File.read(filespec), opts)
+      else
+        JSON.load_file(filespec, opts)
+      end
+    end
   end
 
   # TLS mapping