feat: add languagetool.org premium API support (using form data for t…

…he credentials) (#561)

Co-authored-by: Johan Girod <dev@johangirod.com>
Co-authored-by: David L. Day <1132144+davidlday@users.noreply.github.com>

package.json

@@ -188,6 +188,16 @@
           "default": "http://localhost:8081",
           "description": "URL of your LanguageTool server. Defaults to localhost on port 8081."
         },
+        "languageToolLinter.external.username": {
+          "type": "string",
+          "default": "",
+          "description": "Set to get Premium API access if you use the languagetool.org api instance: your username/email as used to log in at languagetool.org."
+        },
+        "languageToolLinter.external.apiKey": {
+          "type": "string",
+          "default": "",
+          "description": "Set to get Premium API access if you use the languagetool.org api instance: your API key."
+        },
         "languageToolLinter.managed.classPath": {
           "type": "string",
           "default": "",

src/ConfigurationManager.ts

@@ -18,6 +18,7 @@ import execa from "execa";
 import * as glob from "glob";
 import * as path from "path";
 import * as portfinder from "portfinder";
+import { URL } from "url";
 import {
   commands,
   ConfigurationChangeEvent,
@@ -391,6 +392,16 @@ export class ConfigurationManager implements Disposable {
         Constants.EXTENSION_OUTPUT_CHANNEL.appendLine(ltKey + ": " + value);
       }
     });
+    // Only add user name and API key to options if set and we are using the
+    // external API
+    if (this.getServiceType() === Constants.SERVICE_TYPE_EXTERNAL) {
+      const username = this.get("external.username");
+      const apiKey = this.get("external.apiKey");
+      if (username && apiKey) {
+        parameters.set("username", username);
+        parameters.set("apiKey", apiKey);
+      }  
+    }
     // Make sure disabled rules and disabled categories do not contain spaces
     const CONFIG_DISABLED_RULES = "languageTool.disabledRules";
     const CONFIG_DISABLED_CATEGORIES = "languageTool.disabledCategories";