support for JSONPath syntax in oAuth2 mapping

Gemfile

@@ -14,6 +14,7 @@ gem 'webpacker', '~> 5.x'
 gem 'jbuilder', '~> 2.5'
 gem 'jbuilder_cache_multi'
 gem 'json', '>= 2.3.0'
+gem 'jsonpath'
 
 gem 'forgery'
 gem 'responders', '~> 2.0'

Gemfile.lock

@@ -181,6 +181,8 @@ GEM
     jbuilder_cache_multi (0.1.0)
       jbuilder (>= 1.5.0, < 3)
     json (2.3.1)
+    jsonpath (1.1.0)
+      multi_json
     jwt (2.2.1)
     kaminari (1.2.1)
       activesupport (>= 4.1.0)
@@ -457,6 +459,7 @@ DEPENDENCIES
   jbuilder (~> 2.5)
   jbuilder_cache_multi
   json (>= 2.3.0)
+  jsonpath
   kaminari
   listen (~> 3.0.5)
   message_format

app/frontend/templates/admin/authentications/_oauth2_mapping.html

@@ -64,10 +64,11 @@
             </td>
             <td ng-class="{'has-error': mappingForm['auth_mapping[api_field]'].$dirty && mappingForm['auth_mapping[api_field]'].$invalid}">
                 <input type="text"
-                       class="form-control"
+                       class="form-control help-cursor"
                        placeholder="field_name"
                        ng-model="newMapping.api_field"
                        name="auth_mapping[api_field]"
+                       title="{{ 'app.shared.oauth2.api_field_help' | translate }}"
                        required/>
             </td>
             <td>

config/locales/app.shared.en.yml

@@ -274,6 +274,7 @@ en:
         api_endpoint_url: "API endpoint URL"
         api_type: "API type"
         api_fields: "API fields"
+        api_field_help: "JsonPath syntax is supported.\n If many fields are selected, the first one will be used.\n Example: $.data[*].name"
       #machine/training slot modification modal
       confirm_modify_slot_modal:
         change_the_slot: "Change the slot"

lib/omni_auth/strategies/sso_oauth2_provider.rb

@@ -1,6 +1,7 @@
 # frozen_string_literal: true
 
 require 'omniauth-oauth2'
+require 'jsonpath'
 
 module OmniAuth::Strategies
   # Authentication strategy provided trough oAuth 2.0
@@ -102,7 +103,7 @@ module OmniAuth::Strategies
           ## NO TRANSFORMATION
           else
             puts "@parsed_info[#{local_sym(mapping)}] found in #{raw_info[mapping.api_endpoint.to_sym]}"
-            @parsed_info[local_sym(mapping)] = raw_info[mapping.api_endpoint.to_sym][mapping.api_field]
+            @parsed_info[local_sym(mapping)] = ::JsonPath.new(mapping.api_field).on(raw_info[mapping.api_endpoint.to_sym]).first
           end
         end
       end