feat: Make authToken optional for folksonomy client

src/folksonomy.ts

@@ -15,10 +15,12 @@ export type FolksonomyKey = {
 export class Folksonomy {
   private readonly fetch: typeof global.fetch;
   private readonly baseUrl: string;
+  private authToken?: string;
   readonly raw: ReturnType<typeof createClient<paths>>;
 
-  constructor(fetch: typeof global.fetch, authToken: string) {
+  constructor(fetch: typeof global.fetch, authToken?: string) {
     this.baseUrl = "https://api.folksonomy.openfoodfacts.org";
+    this.authToken = authToken;
 
     this.fetch = fetch;
     this.raw = createClient({
@@ -53,6 +55,12 @@ export class Folksonomy {
   }
 
   async putTag(tag: FolksonomyTag): Promise<boolean> {
+    if (!this.authToken) {
+      throw new Error(
+        "Auth token must be provided or login method invoked to update a tag",
+      );
+    }
+
     const res = await this.raw.PUT("/product", { body: tag });
 
     return res.response.status === 200;
@@ -81,6 +89,12 @@ export class Folksonomy {
    * @returns if the tag was added or updated
    */
   async addTag(tag: FolksonomyTag): Promise<boolean> {
+    if (!this.authToken) {
+      throw new Error(
+        "Auth token must be provided or login method invoked to add a tag",
+      );
+    }
+
     const res = await this.raw.POST("/product", {
       body: tag,
     });
@@ -94,6 +108,12 @@ export class Folksonomy {
    * @returns if the tag was deleted
    */
   async removeTag(tag: FolksonomyTag & { version: number }) {
+    if (!this.authToken) {
+      throw new Error(
+        "Auth token must be provided or login method invoked to remove a tag",
+      );
+    }
+
     const res = await this.raw.DELETE("/product/{product}/{k}", {
       params: {
         path: { product: tag.product, k: tag.k },