refactor: unify and simplify request helper methods

This commit:
- Replaces `createRequest`, `createPost`, and `submitForm` with a single `sendRequest` helper.
- Adds `getRequest` and `postRequest` wrappers for clarity.
- Removes redundant content type constants and parameters.
- Updates envelope-related methods (`signEnvelope`, `rejectEnvelope`, `shareEnvelope`) to use the new request helpers.
- Simplifies `redirect` and `redirRejected` functions.

EnvelopeGenerator.Web/wwwroot/js/api-service.js

@@ -1,3 +1,4 @@
+//#region parameters
 const env = {
   xsrfToken: document.getElementsByName('__RequestVerificationToken')[0].value,
   envKey: document.querySelector('meta[name="env-key"]').getAttribute('content')
@@ -8,53 +9,53 @@ const url = {
   rejectRedir: `/envelope/${env.envKey}`,
   share: `/api/readonly`
 };
+//#endregion
 
 //#region request helper methods
-function submitForm(form) {
-  fetch(form.action, {
-    method: form.method,
-    body: new FormData(form),
-    headers: {
-      "X-Requested-With": "XMLHttpRequest"
-    }
-  })
-}
-
-function createRequest(method, url, body, contentType = 'application/json') {
-  return fetch(url, {
+function sendRequest(method, url, body = undefined) {
+  const options = {
     credentials: 'include',
     method: method,
     headers: {
-      'Content-Type': contentType,
       'X-XSRF-TOKEN': env.xsrfToken
-    },
-    body: JSON.stringify(body)
-  })
+    }
   }
 
-function createPost(url, body, contentType = 'application/json') {
-  return createRequest('POST', url, body, contentType);
+  if (body !== undefined) {
+    options.body = JSON.stringify(body);
+    options.headers['Content-Type'] = 'application/json';
+  }
+
+  return fetch(url, options);
+}
+
+function getRequest(url) {
+  return sendRequest('GET', url);
+}
+
+function postRequest(url, body) {
+  return sendRequest('POST', url, body);
 }
 
 function redirect(url) {
-  return window.location.href = url;
+  window.location.href = url;
 }
 //#endregion
 
 //#region envelope
 function signEnvelope(annotations) {
-    return createPost(`/api/annotation`, annotations, contentType)
+  return postRequest(`/api/annotation`, annotations)
 }
 
 function rejectEnvelope(reason) {
-  return createPost(url.reject, reason, Content.JSON);
+  return postRequest(url.reject, reason);
 }
 
 function shareEnvelope(receiverMail, dateValid) {
-  return createPost(url.share, { receiverMail: receiverMail, dateValid: dateValid }, Content.JSON);
+  return postRequest(url.share, { receiverMail: receiverMail, dateValid: dateValid });
 }
 //#endregion
 
 function redirRejected() {
-  return redirect(url.rejectRedir);
+  redirect(url.rejectRedir);
 }

EnvelopeGenerator.Web/wwwroot/js/api-service.min.js

@@ -1 +1 @@
-function submitForm(n){fetch(n.action,{method:n.method,body:new FormData(n),headers:{"X-Requested-With":"XMLHttpRequest"}})}function createRequest(n,t,i,r="application/json"){return fetch(t,{credentials:"include",method:n,headers:{"Content-Type":r,"X-XSRF-TOKEN":env.xsrfToken},body:JSON.stringify(i)})}function createPost(n,t,i="application/json"){return createRequest("POST",n,t,i)}function redirect(n){return window.location.href=n}function signEnvelope(n){return createPost(`/api/annotation`,n,contentType)}function rejectEnvelope(n){return createPost(url.reject,n,Content.JSON)}function shareEnvelope(n,t){return createPost(url.share,{receiverMail:n,dateValid:t},Content.JSON)}function redirRejected(){return redirect(url.rejectRedir)}const env={xsrfToken:document.getElementsByName("__RequestVerificationToken")[0].value,envKey:document.querySelector('meta[name="env-key"]').getAttribute("content")},url={reject:`/api/annotation/reject`,rejectRedir:`/envelope/${env.envKey}`,share:`/api/readonly`};
+function sendRequest(n,t,i=undefined){const r={credentials:"include",method:n,headers:{"X-XSRF-TOKEN":env.xsrfToken}};return i!==undefined&&(r.body=JSON.stringify(i),r.headers["Content-Type"]="application/json"),fetch(t,r)}function getRequest(n){return sendRequest("GET",n)}function postRequest(n,t){return sendRequest("POST",n,t)}function redirect(n){window.location.href=n}function signEnvelope(n){return postRequest(`/api/annotation`,n)}function rejectEnvelope(n){return postRequest(url.reject,n)}function shareEnvelope(n,t){return postRequest(url.share,{receiverMail:n,dateValid:t})}function redirRejected(){redirect(url.rejectRedir)}const env={xsrfToken:document.getElementsByName("__RequestVerificationToken")[0].value,envKey:document.querySelector('meta[name="env-key"]').getAttribute("content")},url={reject:`/api/annotation/reject`,rejectRedir:`/envelope/${env.envKey}`,share:`/api/readonly`};