From c438b6ac160df192f6de9bf47d765a0cc1a6e21e Mon Sep 17 00:00:00 2001
From: Ivan <8611739+IRBorisov@users.noreply.github.com>
Date: Wed, 24 Jul 2024 23:20:45 +0300
Subject: [PATCH] Refactoring: split backendAPI into modules

---
 rsconcept/frontend/src/app/backendAPI.ts      | 577 ------------------
 .../frontend/src/backend/apiConfiguration.ts  |  25 +
 .../frontend/src/backend/apiTransport.ts      | 114 ++++
 rsconcept/frontend/src/backend/cctext.ts      |  28 +
 .../frontend/src/backend/constituents.ts      |  14 +
 rsconcept/frontend/src/backend/library.ts     | 131 ++++
 rsconcept/frontend/src/backend/operations.ts  |  14 +
 rsconcept/frontend/src/backend/oss.ts         |  44 ++
 rsconcept/frontend/src/backend/rsforms.ts     | 145 +++++
 rsconcept/frontend/src/backend/users.ts       |  99 +++
 rsconcept/frontend/src/backend/versions.ts    |  30 +
 .../frontend/src/context/AuthContext.tsx      |   4 +-
 .../frontend/src/context/LibraryContext.tsx   |   9 +-
 rsconcept/frontend/src/context/OssContext.tsx |  12 +-
 .../frontend/src/context/RSFormContext.tsx    |  32 +-
 .../src/context/UserProfileContext.tsx        |   3 +-
 .../frontend/src/context/UsersContext.tsx     |   2 +-
 .../frontend/src/hooks/useCheckExpression.ts  |   3 +-
 .../frontend/src/hooks/useConceptText.ts      |   3 +-
 rsconcept/frontend/src/hooks/useOssDetails.ts |   2 +-
 .../frontend/src/hooks/useRSFormDetails.ts    |   2 +-
 21 files changed, 680 insertions(+), 613 deletions(-)
 delete mode 100644 rsconcept/frontend/src/app/backendAPI.ts
 create mode 100644 rsconcept/frontend/src/backend/apiConfiguration.ts
 create mode 100644 rsconcept/frontend/src/backend/apiTransport.ts
 create mode 100644 rsconcept/frontend/src/backend/cctext.ts
 create mode 100644 rsconcept/frontend/src/backend/constituents.ts
 create mode 100644 rsconcept/frontend/src/backend/library.ts
 create mode 100644 rsconcept/frontend/src/backend/operations.ts
 create mode 100644 rsconcept/frontend/src/backend/oss.ts
 create mode 100644 rsconcept/frontend/src/backend/rsforms.ts
 create mode 100644 rsconcept/frontend/src/backend/users.ts
 create mode 100644 rsconcept/frontend/src/backend/versions.ts

diff --git a/rsconcept/frontend/src/app/backendAPI.ts b/rsconcept/frontend/src/app/backendAPI.ts
deleted file mode 100644
index 4dddb75e..00000000
--- a/rsconcept/frontend/src/app/backendAPI.ts
+++ /dev/null
@@ -1,577 +0,0 @@
-/**
- * Module: API for backend communications.
- */
-
-import axios, { AxiosError, AxiosRequestConfig } from 'axios';
-import { toast } from 'react-toastify';
-
-import { type ErrorData } from '@/components/info/InfoError';
-import { ILexemeData, ITextRequest, ITextResult, IWordFormPlain } from '@/models/language';
-import { ILibraryItem, ILibraryUpdateData, ITargetAccessPolicy, ITargetLocation, IVersionData } from '@/models/library';
-import { ILibraryCreateData } from '@/models/library';
-import {
-  ICstSubstituteData,
-  IOperationCreateData,
-  IOperationCreatedResponse,
-  IOperationSchemaData,
-  IPositionsData,
-  ITargetOperation
-} from '@/models/oss';
-import {
-  IConstituentaList,
-  IConstituentaMeta,
-  ICstCreateData,
-  ICstCreatedResponse,
-  ICstMovetoData,
-  ICstRenameData,
-  ICstUpdateData,
-  IInlineSynthesisData,
-  IProduceStructureResponse,
-  IRSFormCloneData,
-  IRSFormData,
-  IRSFormUploadData,
-  ITargetCst,
-  IVersionCreatedResponse
-} from '@/models/rsform';
-import { IExpressionParse, IRSExpression } from '@/models/rslang';
-import {
-  ICurrentUser,
-  IPasswordTokenData,
-  IRequestPasswordData,
-  IResetPasswordData,
-  ITargetUser,
-  ITargetUsers,
-  IUserInfo,
-  IUserLoginData,
-  IUserProfile,
-  IUserSignupData,
-  IUserUpdateData,
-  IUserUpdatePassword
-} from '@/models/user';
-import { buildConstants } from '@/utils/buildConstants';
-
-const defaultOptions = {
-  xsrfCookieName: 'csrftoken',
-  xsrfHeaderName: 'x-csrftoken',
-  baseURL: `${buildConstants.backend}`,
-  withCredentials: true
-};
-
-const axiosInstance = axios.create(defaultOptions);
-axiosInstance.interceptors.request.use(config => {
-  const token = document.cookie
-    .split('; ')
-    .find(row => row.startsWith('csrftoken='))
-    ?.split('=')[1];
-  if (token) {
-    config.headers['x-csrftoken'] = token;
-  }
-  return config;
-});
-
-// ================ Data transfer types ================
-export type DataCallback<ResponseData = undefined> = (data: ResponseData) => void;
-
-interface IFrontRequest<RequestData, ResponseData> {
-  data?: RequestData;
-  onSuccess?: DataCallback<ResponseData>;
-  onError?: (error: ErrorData) => void;
-  setLoading?: (loading: boolean) => void;
-  showError?: boolean;
-}
-
-export interface FrontPush<DataType> extends IFrontRequest<DataType, undefined> {
-  data: DataType;
-}
-export interface FrontPull<DataType> extends IFrontRequest<undefined, DataType> {
-  onSuccess: DataCallback<DataType>;
-}
-
-export interface FrontExchange<RequestData, ResponseData> extends IFrontRequest<RequestData, ResponseData> {
-  data: RequestData;
-  onSuccess: DataCallback<ResponseData>;
-}
-
-export interface FrontAction extends IFrontRequest<undefined, undefined> {}
-
-interface IAxiosRequest<RequestData, ResponseData> {
-  endpoint: string;
-  request: IFrontRequest<RequestData, ResponseData>;
-  options?: AxiosRequestConfig;
-}
-
-// ==================== API ====================
-export function getAuth(request: FrontPull<ICurrentUser>) {
-  AxiosGet({
-    endpoint: `/users/api/auth`,
-    request: request
-  });
-}
-
-export function postLogin(request: FrontPush<IUserLoginData>) {
-  AxiosPost({
-    endpoint: '/users/api/login',
-    request: request
-  });
-}
-
-export function postLogout(request: FrontAction) {
-  AxiosPost({
-    endpoint: '/users/api/logout',
-    request: request
-  });
-}
-
-export function postSignup(request: FrontExchange<IUserSignupData, IUserProfile>) {
-  AxiosPost({
-    endpoint: '/users/api/signup',
-    request: request
-  });
-}
-
-export function getProfile(request: FrontPull<IUserProfile>) {
-  AxiosGet({
-    endpoint: '/users/api/profile',
-    request: request
-  });
-}
-
-export function patchProfile(request: FrontExchange<IUserUpdateData, IUserProfile>) {
-  AxiosPatch({
-    endpoint: '/users/api/profile',
-    request: request
-  });
-}
-
-export function patchPassword(request: FrontPush<IUserUpdatePassword>) {
-  AxiosPatch({
-    endpoint: '/users/api/change-password',
-    request: request
-  });
-}
-
-export function postRequestPasswordReset(request: FrontPush<IRequestPasswordData>) {
-  // title: 'Request password reset',
-  AxiosPost({
-    endpoint: '/users/api/password-reset',
-    request: request
-  });
-}
-
-export function postValidatePasswordToken(request: FrontPush<IPasswordTokenData>) {
-  // title: 'Validate password token',
-  AxiosPost({
-    endpoint: '/users/api/password-reset/validate',
-    request: request
-  });
-}
-
-export function postResetPassword(request: FrontPush<IResetPasswordData>) {
-  // title: 'Reset password',
-  AxiosPost({
-    endpoint: '/users/api/password-reset/confirm',
-    request: request
-  });
-}
-
-export function getActiveUsers(request: FrontPull<IUserInfo[]>) {
-  // title: 'Active users list',
-  AxiosGet({
-    endpoint: '/users/api/active-users',
-    request: request
-  });
-}
-
-export function getLibrary(request: FrontPull<ILibraryItem[]>) {
-  // title: 'Available LibraryItems list',
-  AxiosGet({
-    endpoint: '/api/library/active',
-    request: request
-  });
-}
-
-export function getAdminLibrary(request: FrontPull<ILibraryItem[]>) {
-  // title: 'All LibraryItems list',
-  AxiosGet({
-    endpoint: '/api/library/all',
-    request: request
-  });
-}
-
-export function getTemplates(request: FrontPull<ILibraryItem[]>) {
-  AxiosGet({
-    endpoint: '/api/library/templates',
-    request: request
-  });
-}
-
-export function postRSFormFromFile(request: FrontExchange<ILibraryCreateData, ILibraryItem>) {
-  AxiosPost({
-    endpoint: '/api/rsforms/create-detailed',
-    request: request,
-    options: {
-      headers: {
-        'Content-Type': 'multipart/form-data'
-      }
-    }
-  });
-}
-
-export function postCreateLibraryItem(request: FrontExchange<ILibraryCreateData, ILibraryItem>) {
-  AxiosPost({
-    endpoint: '/api/library',
-    request: request
-  });
-}
-
-export function postCloneLibraryItem(target: string, request: FrontExchange<IRSFormCloneData, IRSFormData>) {
-  AxiosPost({
-    endpoint: `/api/library/${target}/clone`,
-    request: request
-  });
-}
-
-export function getRSFormDetails(target: string, version: string, request: FrontPull<IRSFormData>) {
-  if (!version) {
-    AxiosGet({
-      endpoint: `/api/rsforms/${target}/details`,
-      request: request
-    });
-  } else {
-    AxiosGet({
-      endpoint: `/api/rsforms/${target}/versions/${version}`,
-      request: request
-    });
-  }
-}
-
-export function patchLibraryItem(target: string, request: FrontExchange<ILibraryUpdateData, ILibraryItem>) {
-  AxiosPatch({
-    endpoint: `/api/library/${target}`,
-    request: request
-  });
-}
-
-export function deleteLibraryItem(target: string, request: FrontAction) {
-  AxiosDelete({
-    endpoint: `/api/library/${target}`,
-    request: request
-  });
-}
-
-export function patchSetOwner(target: string, request: FrontPush<ITargetUser>) {
-  AxiosPatch({
-    endpoint: `/api/library/${target}/set-owner`,
-    request: request
-  });
-}
-
-export function patchSetAccessPolicy(target: string, request: FrontPush<ITargetAccessPolicy>) {
-  AxiosPatch({
-    endpoint: `/api/library/${target}/set-access-policy`,
-    request: request
-  });
-}
-
-export function patchSetLocation(target: string, request: FrontPush<ITargetLocation>) {
-  AxiosPatch({
-    endpoint: `/api/library/${target}/set-location`,
-    request: request
-  });
-}
-
-export function patchEditorsAdd(target: string, request: FrontPush<ITargetUser>) {
-  AxiosPatch({
-    endpoint: `/api/library/${target}/editors-add`,
-    request: request
-  });
-}
-
-export function patchEditorsRemove(target: string, request: FrontPush<ITargetUser>) {
-  AxiosPatch({
-    endpoint: `/api/library/${target}/editors-remove`,
-    request: request
-  });
-}
-
-export function patchEditorsSet(target: string, request: FrontPush<ITargetUsers>) {
-  AxiosPatch({
-    endpoint: `/api/library/${target}/editors-set`,
-    request: request
-  });
-}
-
-export function postSubscribe(target: string, request: FrontAction) {
-  AxiosPost({
-    endpoint: `/api/library/${target}/subscribe`,
-    request: request
-  });
-}
-
-export function deleteUnsubscribe(target: string, request: FrontAction) {
-  AxiosDelete({
-    endpoint: `/api/library/${target}/unsubscribe`,
-    request: request
-  });
-}
-
-export function getTRSFile(target: string, version: string, request: FrontPull<Blob>) {
-  if (!version) {
-    AxiosGet({
-      endpoint: `/api/rsforms/${target}/export-trs`,
-      request: request,
-      options: { responseType: 'blob' }
-    });
-  } else {
-    AxiosGet({
-      endpoint: `/api/versions/${version}/export-file`,
-      request: request,
-      options: { responseType: 'blob' }
-    });
-  }
-}
-
-export function postCreateConstituenta(schema: string, request: FrontExchange<ICstCreateData, ICstCreatedResponse>) {
-  AxiosPost({
-    endpoint: `/api/rsforms/${schema}/cst-create`,
-    request: request
-  });
-}
-
-export function patchDeleteConstituenta(schema: string, request: FrontExchange<IConstituentaList, IRSFormData>) {
-  AxiosPatch({
-    endpoint: `/api/rsforms/${schema}/cst-delete-multiple`,
-    request: request
-  });
-}
-
-export function patchConstituenta(target: string, request: FrontExchange<ICstUpdateData, IConstituentaMeta>) {
-  AxiosPatch({
-    endpoint: `/api/constituents/${target}`,
-    request: request
-  });
-}
-
-export function patchRenameConstituenta(schema: string, request: FrontExchange<ICstRenameData, ICstCreatedResponse>) {
-  AxiosPatch({
-    endpoint: `/api/rsforms/${schema}/cst-rename`,
-    request: request
-  });
-}
-
-export function patchProduceStructure(schema: string, request: FrontExchange<ITargetCst, IProduceStructureResponse>) {
-  AxiosPatch({
-    endpoint: `/api/rsforms/${schema}/cst-produce-structure`,
-    request: request
-  });
-}
-
-export function patchSubstituteConstituents(schema: string, request: FrontExchange<ICstSubstituteData, IRSFormData>) {
-  AxiosPatch({
-    endpoint: `/api/rsforms/${schema}/cst-substitute`,
-    request: request
-  });
-}
-
-export function patchMoveConstituenta(schema: string, request: FrontExchange<ICstMovetoData, IRSFormData>) {
-  AxiosPatch({
-    endpoint: `/api/rsforms/${schema}/cst-moveto`,
-    request: request
-  });
-}
-
-export function postCheckExpression(schema: string, request: FrontExchange<IRSExpression, IExpressionParse>) {
-  AxiosPost({
-    endpoint: `/api/rsforms/${schema}/check`,
-    request: request
-  });
-}
-
-export function patchResetAliases(target: string, request: FrontPull<IRSFormData>) {
-  AxiosPatch({
-    endpoint: `/api/rsforms/${target}/reset-aliases`,
-    request: request
-  });
-}
-
-export function patchRestoreOrder(target: string, request: FrontPull<IRSFormData>) {
-  AxiosPatch({
-    endpoint: `/api/rsforms/${target}/restore-order`,
-    request: request
-  });
-}
-
-export function patchUploadTRS(target: string, request: FrontExchange<IRSFormUploadData, IRSFormData>) {
-  AxiosPatch({
-    endpoint: `/api/rsforms/${target}/load-trs`,
-    request: request,
-    options: {
-      headers: {
-        'Content-Type': 'multipart/form-data'
-      }
-    }
-  });
-}
-export function patchInlineSynthesis(request: FrontExchange<IInlineSynthesisData, IRSFormData>) {
-  AxiosPatch({
-    endpoint: `/api/operations/inline-synthesis`,
-    request: request
-  });
-}
-
-export function getOssDetails(target: string, request: FrontPull<IOperationSchemaData>) {
-  AxiosGet({
-    endpoint: `/api/oss/${target}/details`,
-    request: request
-  });
-}
-
-export function patchUpdatePositions(schema: string, request: FrontPush<IPositionsData>) {
-  AxiosPatch({
-    endpoint: `/api/oss/${schema}/update-positions`,
-    request: request
-  });
-}
-
-export function postCreateOperation(
-  schema: string,
-  request: FrontExchange<IOperationCreateData, IOperationCreatedResponse>
-) {
-  AxiosPost({
-    endpoint: `/api/oss/${schema}/create-operation`,
-    request: request
-  });
-}
-
-export function patchDeleteOperation(schema: string, request: FrontExchange<ITargetOperation, IOperationSchemaData>) {
-  AxiosPatch({
-    endpoint: `/api/oss/${schema}/delete-operation`,
-    request: request
-  });
-}
-
-export function postInflectText(request: FrontExchange<IWordFormPlain, ITextResult>) {
-  AxiosPost({
-    endpoint: `/api/cctext/inflect`,
-    request: request
-  });
-}
-
-export function postParseText(request: FrontExchange<ITextRequest, ITextResult>) {
-  AxiosPost({
-    endpoint: `/api/cctext/parse`,
-    request: request
-  });
-}
-
-export function postGenerateLexeme(request: FrontExchange<ITextRequest, ILexemeData>) {
-  // title: `Parse text ${request.data.text}`,
-  AxiosPost({
-    endpoint: `/api/cctext/generate-lexeme`,
-    request: request
-  });
-}
-
-export function postCreateVersion(target: string, request: FrontExchange<IVersionData, IVersionCreatedResponse>) {
-  // title: `Create version for RSForm id=${target}`,
-  AxiosPost({
-    endpoint: `/api/rsforms/${target}/versions/create`,
-    request: request
-  });
-}
-
-export function patchVersion(target: string, request: FrontPush<IVersionData>) {
-  // title: `Version id=${target}`,
-  AxiosPatch({
-    endpoint: `/api/versions/${target}`,
-    request: request
-  });
-}
-
-export function patchRestoreVersion(target: string, request: FrontPull<IRSFormData>) {
-  AxiosPatch({
-    endpoint: `/api/versions/${target}/restore`,
-    request: request
-  });
-}
-
-export function deleteVersion(target: string, request: FrontAction) {
-  AxiosDelete({
-    endpoint: `/api/versions/${target}`,
-    request: request
-  });
-}
-
-// ============ Helper functions =============
-function AxiosGet<ResponseData>({ endpoint, request, options }: IAxiosRequest<undefined, ResponseData>) {
-  if (request.setLoading) request.setLoading(true);
-  axiosInstance
-    .get<ResponseData>(endpoint, options)
-    .then(response => {
-      if (request.setLoading) request.setLoading(false);
-      if (request.onSuccess) request.onSuccess(response.data);
-    })
-    .catch((error: Error | AxiosError) => {
-      if (request.setLoading) request.setLoading(false);
-      if (request.showError) toast.error(error.message);
-      if (request.onError) request.onError(error);
-    });
-}
-
-function AxiosPost<RequestData, ResponseData>({
-  endpoint,
-  request,
-  options
-}: IAxiosRequest<RequestData, ResponseData>) {
-  if (request.setLoading) request.setLoading(true);
-  axiosInstance
-    .post<ResponseData>(endpoint, request.data, options)
-    .then(response => {
-      if (request.setLoading) request.setLoading(false);
-      if (request.onSuccess) request.onSuccess(response.data);
-    })
-    .catch((error: Error | AxiosError) => {
-      if (request.setLoading) request.setLoading(false);
-      if (request.showError) toast.error(error.message);
-      if (request.onError) request.onError(error);
-    });
-}
-
-function AxiosDelete<RequestData, ResponseData>({
-  endpoint,
-  request,
-  options
-}: IAxiosRequest<RequestData, ResponseData>) {
-  if (request.setLoading) request.setLoading(true);
-  axiosInstance
-    .delete<ResponseData>(endpoint, options)
-    .then(response => {
-      if (request.setLoading) request.setLoading(false);
-      if (request.onSuccess) request.onSuccess(response.data);
-    })
-    .catch((error: Error | AxiosError) => {
-      if (request.setLoading) request.setLoading(false);
-      if (request.showError) toast.error(error.message);
-      if (request.onError) request.onError(error);
-    });
-}
-
-function AxiosPatch<RequestData, ResponseData>({
-  endpoint,
-  request,
-  options
-}: IAxiosRequest<RequestData, ResponseData>) {
-  if (request.setLoading) request.setLoading(true);
-  axiosInstance
-    .patch<ResponseData>(endpoint, request.data, options)
-    .then(response => {
-      if (request.setLoading) request.setLoading(false);
-      if (request.onSuccess) request.onSuccess(response.data);
-      return response.data;
-    })
-    .catch((error: Error | AxiosError) => {
-      if (request.setLoading) request.setLoading(false);
-      if (request.showError) toast.error(error.message);
-      if (request.onError) request.onError(error);
-    });
-}
diff --git a/rsconcept/frontend/src/backend/apiConfiguration.ts b/rsconcept/frontend/src/backend/apiConfiguration.ts
new file mode 100644
index 00000000..5bde1a68
--- /dev/null
+++ b/rsconcept/frontend/src/backend/apiConfiguration.ts
@@ -0,0 +1,25 @@
+/**
+ * Module: communication setup.
+ */
+import axios from 'axios';
+
+import { buildConstants } from '@/utils/buildConstants';
+
+const defaultOptions = {
+  xsrfCookieName: 'csrftoken',
+  xsrfHeaderName: 'x-csrftoken',
+  baseURL: `${buildConstants.backend}`,
+  withCredentials: true
+};
+
+export const axiosInstance = axios.create(defaultOptions);
+axiosInstance.interceptors.request.use(config => {
+  const token = document.cookie
+    .split('; ')
+    .find(row => row.startsWith('csrftoken='))
+    ?.split('=')[1];
+  if (token) {
+    config.headers['x-csrftoken'] = token;
+  }
+  return config;
+});
diff --git a/rsconcept/frontend/src/backend/apiTransport.ts b/rsconcept/frontend/src/backend/apiTransport.ts
new file mode 100644
index 00000000..c07f9979
--- /dev/null
+++ b/rsconcept/frontend/src/backend/apiTransport.ts
@@ -0,0 +1,114 @@
+/**
+ * Module: generic API for backend REST communications.
+ */
+import { AxiosError, AxiosRequestConfig } from 'axios';
+import { toast } from 'react-toastify';
+
+import { ErrorData } from '@/components/info/InfoError';
+
+import { axiosInstance } from './apiConfiguration';
+
+// ================ Data transfer types ================
+export type DataCallback<ResponseData = undefined> = (data: ResponseData) => void;
+
+export interface IFrontRequest<RequestData, ResponseData> {
+  data?: RequestData;
+  onSuccess?: DataCallback<ResponseData>;
+  onError?: (error: ErrorData) => void;
+  setLoading?: (loading: boolean) => void;
+  showError?: boolean;
+}
+
+export interface FrontPush<DataType> extends IFrontRequest<DataType, undefined> {
+  data: DataType;
+}
+export interface FrontPull<DataType> extends IFrontRequest<undefined, DataType> {
+  onSuccess: DataCallback<DataType>;
+}
+
+export interface FrontExchange<RequestData, ResponseData> extends IFrontRequest<RequestData, ResponseData> {
+  data: RequestData;
+  onSuccess: DataCallback<ResponseData>;
+}
+
+export interface FrontAction extends IFrontRequest<undefined, undefined> {}
+
+export interface IAxiosRequest<RequestData, ResponseData> {
+  endpoint: string;
+  request: IFrontRequest<RequestData, ResponseData>;
+  options?: AxiosRequestConfig;
+}
+
+// ================ Transport API calls ================
+export function AxiosGet<ResponseData>({ endpoint, request, options }: IAxiosRequest<undefined, ResponseData>) {
+  if (request.setLoading) request.setLoading(true);
+  axiosInstance
+    .get<ResponseData>(endpoint, options)
+    .then(response => {
+      if (request.setLoading) request.setLoading(false);
+      if (request.onSuccess) request.onSuccess(response.data);
+    })
+    .catch((error: Error | AxiosError) => {
+      if (request.setLoading) request.setLoading(false);
+      if (request.showError) toast.error(error.message);
+      if (request.onError) request.onError(error);
+    });
+}
+
+export function AxiosPost<RequestData, ResponseData>({
+  endpoint,
+  request,
+  options
+}: IAxiosRequest<RequestData, ResponseData>) {
+  if (request.setLoading) request.setLoading(true);
+  axiosInstance
+    .post<ResponseData>(endpoint, request.data, options)
+    .then(response => {
+      if (request.setLoading) request.setLoading(false);
+      if (request.onSuccess) request.onSuccess(response.data);
+    })
+    .catch((error: Error | AxiosError) => {
+      if (request.setLoading) request.setLoading(false);
+      if (request.showError) toast.error(error.message);
+      if (request.onError) request.onError(error);
+    });
+}
+
+export function AxiosDelete<RequestData, ResponseData>({
+  endpoint,
+  request,
+  options
+}: IAxiosRequest<RequestData, ResponseData>) {
+  if (request.setLoading) request.setLoading(true);
+  axiosInstance
+    .delete<ResponseData>(endpoint, options)
+    .then(response => {
+      if (request.setLoading) request.setLoading(false);
+      if (request.onSuccess) request.onSuccess(response.data);
+    })
+    .catch((error: Error | AxiosError) => {
+      if (request.setLoading) request.setLoading(false);
+      if (request.showError) toast.error(error.message);
+      if (request.onError) request.onError(error);
+    });
+}
+
+export function AxiosPatch<RequestData, ResponseData>({
+  endpoint,
+  request,
+  options
+}: IAxiosRequest<RequestData, ResponseData>) {
+  if (request.setLoading) request.setLoading(true);
+  axiosInstance
+    .patch<ResponseData>(endpoint, request.data, options)
+    .then(response => {
+      if (request.setLoading) request.setLoading(false);
+      if (request.onSuccess) request.onSuccess(response.data);
+      return response.data;
+    })
+    .catch((error: Error | AxiosError) => {
+      if (request.setLoading) request.setLoading(false);
+      if (request.showError) toast.error(error.message);
+      if (request.onError) request.onError(error);
+    });
+}
diff --git a/rsconcept/frontend/src/backend/cctext.ts b/rsconcept/frontend/src/backend/cctext.ts
new file mode 100644
index 00000000..46b064ca
--- /dev/null
+++ b/rsconcept/frontend/src/backend/cctext.ts
@@ -0,0 +1,28 @@
+/**
+ * Endpoints: cctext.
+ */
+
+import { ILexemeData, ITextRequest, ITextResult, IWordFormPlain } from '@/models/language';
+
+import { AxiosPost, FrontExchange } from './apiTransport';
+
+export function postInflectText(request: FrontExchange<IWordFormPlain, ITextResult>) {
+  AxiosPost({
+    endpoint: `/api/cctext/inflect`,
+    request: request
+  });
+}
+
+export function postParseText(request: FrontExchange<ITextRequest, ITextResult>) {
+  AxiosPost({
+    endpoint: `/api/cctext/parse`,
+    request: request
+  });
+}
+
+export function postGenerateLexeme(request: FrontExchange<ITextRequest, ILexemeData>) {
+  AxiosPost({
+    endpoint: `/api/cctext/generate-lexeme`,
+    request: request
+  });
+}
diff --git a/rsconcept/frontend/src/backend/constituents.ts b/rsconcept/frontend/src/backend/constituents.ts
new file mode 100644
index 00000000..576e9e05
--- /dev/null
+++ b/rsconcept/frontend/src/backend/constituents.ts
@@ -0,0 +1,14 @@
+/**
+ * Endpoints: constituents.
+ */
+
+import { IConstituentaMeta, ICstUpdateData } from '@/models/rsform';
+
+import { AxiosPatch, FrontExchange } from './apiTransport';
+
+export function patchConstituenta(target: string, request: FrontExchange<ICstUpdateData, IConstituentaMeta>) {
+  AxiosPatch({
+    endpoint: `/api/constituents/${target}`,
+    request: request
+  });
+}
diff --git a/rsconcept/frontend/src/backend/library.ts b/rsconcept/frontend/src/backend/library.ts
new file mode 100644
index 00000000..7cae3309
--- /dev/null
+++ b/rsconcept/frontend/src/backend/library.ts
@@ -0,0 +1,131 @@
+/**
+ * Endpoints: library.
+ */
+
+import {
+  ILibraryCreateData,
+  ILibraryItem,
+  ILibraryUpdateData,
+  ITargetAccessPolicy,
+  ITargetLocation
+} from '@/models/library';
+import { IRSFormCloneData, IRSFormData } from '@/models/rsform';
+import { ITargetUser, ITargetUsers } from '@/models/user';
+
+import {
+  AxiosDelete,
+  AxiosGet,
+  AxiosPatch,
+  AxiosPost,
+  FrontAction,
+  FrontExchange,
+  FrontPull,
+  FrontPush
+} from './apiTransport';
+
+export function getLibrary(request: FrontPull<ILibraryItem[]>) {
+  // title: 'Available LibraryItems list',
+  AxiosGet({
+    endpoint: '/api/library/active',
+    request: request
+  });
+}
+
+export function getAdminLibrary(request: FrontPull<ILibraryItem[]>) {
+  // title: 'All LibraryItems list',
+  AxiosGet({
+    endpoint: '/api/library/all',
+    request: request
+  });
+}
+
+export function getTemplates(request: FrontPull<ILibraryItem[]>) {
+  AxiosGet({
+    endpoint: '/api/library/templates',
+    request: request
+  });
+}
+
+export function postCreateLibraryItem(request: FrontExchange<ILibraryCreateData, ILibraryItem>) {
+  AxiosPost({
+    endpoint: '/api/library',
+    request: request
+  });
+}
+
+export function postCloneLibraryItem(target: string, request: FrontExchange<IRSFormCloneData, IRSFormData>) {
+  AxiosPost({
+    endpoint: `/api/library/${target}/clone`,
+    request: request
+  });
+}
+
+export function patchLibraryItem(target: string, request: FrontExchange<ILibraryUpdateData, ILibraryItem>) {
+  AxiosPatch({
+    endpoint: `/api/library/${target}`,
+    request: request
+  });
+}
+
+export function deleteLibraryItem(target: string, request: FrontAction) {
+  AxiosDelete({
+    endpoint: `/api/library/${target}`,
+    request: request
+  });
+}
+
+export function patchSetOwner(target: string, request: FrontPush<ITargetUser>) {
+  AxiosPatch({
+    endpoint: `/api/library/${target}/set-owner`,
+    request: request
+  });
+}
+
+export function patchSetAccessPolicy(target: string, request: FrontPush<ITargetAccessPolicy>) {
+  AxiosPatch({
+    endpoint: `/api/library/${target}/set-access-policy`,
+    request: request
+  });
+}
+
+export function patchSetLocation(target: string, request: FrontPush<ITargetLocation>) {
+  AxiosPatch({
+    endpoint: `/api/library/${target}/set-location`,
+    request: request
+  });
+}
+
+export function patchEditorsAdd(target: string, request: FrontPush<ITargetUser>) {
+  AxiosPatch({
+    endpoint: `/api/library/${target}/editors-add`,
+    request: request
+  });
+}
+
+export function patchEditorsRemove(target: string, request: FrontPush<ITargetUser>) {
+  AxiosPatch({
+    endpoint: `/api/library/${target}/editors-remove`,
+    request: request
+  });
+}
+
+export function patchEditorsSet(target: string, request: FrontPush<ITargetUsers>) {
+  AxiosPatch({
+    endpoint: `/api/library/${target}/editors-set`,
+    request: request
+  });
+}
+
+export function postSubscribe(target: string, request: FrontAction) {
+  AxiosPost({
+    endpoint: `/api/library/${target}/subscribe`,
+    request: request
+  });
+}
+
+export function deleteUnsubscribe(target: string, request: FrontAction) {
+  AxiosDelete({
+    endpoint: `/api/library/${target}/unsubscribe`,
+    request: request
+  });
+}
diff --git a/rsconcept/frontend/src/backend/operations.ts b/rsconcept/frontend/src/backend/operations.ts
new file mode 100644
index 00000000..5fce8876
--- /dev/null
+++ b/rsconcept/frontend/src/backend/operations.ts
@@ -0,0 +1,14 @@
+/**
+ * Endpoints: operations.
+ */
+
+import { IInlineSynthesisData, IRSFormData } from '@/models/rsform';
+
+import { AxiosPatch, FrontExchange } from './apiTransport';
+
+export function patchInlineSynthesis(request: FrontExchange<IInlineSynthesisData, IRSFormData>) {
+  AxiosPatch({
+    endpoint: `/api/operations/inline-synthesis`,
+    request: request
+  });
+}
diff --git a/rsconcept/frontend/src/backend/oss.ts b/rsconcept/frontend/src/backend/oss.ts
new file mode 100644
index 00000000..8b319958
--- /dev/null
+++ b/rsconcept/frontend/src/backend/oss.ts
@@ -0,0 +1,44 @@
+/**
+ * Endpoints: oss.
+ */
+
+import {
+  IOperationCreateData,
+  IOperationCreatedResponse,
+  IOperationSchemaData,
+  IPositionsData,
+  ITargetOperation
+} from '@/models/oss';
+
+import { AxiosGet, AxiosPatch, AxiosPost, FrontExchange, FrontPull, FrontPush } from './apiTransport';
+
+export function getOssDetails(target: string, request: FrontPull<IOperationSchemaData>) {
+  AxiosGet({
+    endpoint: `/api/oss/${target}/details`,
+    request: request
+  });
+}
+
+export function patchUpdatePositions(schema: string, request: FrontPush<IPositionsData>) {
+  AxiosPatch({
+    endpoint: `/api/oss/${schema}/update-positions`,
+    request: request
+  });
+}
+
+export function postCreateOperation(
+  schema: string,
+  request: FrontExchange<IOperationCreateData, IOperationCreatedResponse>
+) {
+  AxiosPost({
+    endpoint: `/api/oss/${schema}/create-operation`,
+    request: request
+  });
+}
+
+export function patchDeleteOperation(schema: string, request: FrontExchange<ITargetOperation, IOperationSchemaData>) {
+  AxiosPatch({
+    endpoint: `/api/oss/${schema}/delete-operation`,
+    request: request
+  });
+}
diff --git a/rsconcept/frontend/src/backend/rsforms.ts b/rsconcept/frontend/src/backend/rsforms.ts
new file mode 100644
index 00000000..8134d447
--- /dev/null
+++ b/rsconcept/frontend/src/backend/rsforms.ts
@@ -0,0 +1,145 @@
+/**
+ * Endpoints: rsforms.
+ */
+
+import { ILibraryCreateData, ILibraryItem, IVersionData } from '@/models/library';
+import { ICstSubstituteData } from '@/models/oss';
+import {
+  IConstituentaList,
+  ICstCreateData,
+  ICstCreatedResponse,
+  ICstMovetoData,
+  ICstRenameData,
+  IProduceStructureResponse,
+  IRSFormData,
+  IRSFormUploadData,
+  ITargetCst,
+  IVersionCreatedResponse
+} from '@/models/rsform';
+import { IExpressionParse, IRSExpression } from '@/models/rslang';
+
+import { AxiosGet, AxiosPatch, AxiosPost, FrontExchange, FrontPull } from './apiTransport';
+
+export function postRSFormFromFile(request: FrontExchange<ILibraryCreateData, ILibraryItem>) {
+  AxiosPost({
+    endpoint: '/api/rsforms/create-detailed',
+    request: request,
+    options: {
+      headers: {
+        'Content-Type': 'multipart/form-data'
+      }
+    }
+  });
+}
+
+export function getRSFormDetails(target: string, version: string, request: FrontPull<IRSFormData>) {
+  if (!version) {
+    AxiosGet({
+      endpoint: `/api/rsforms/${target}/details`,
+      request: request
+    });
+  } else {
+    AxiosGet({
+      endpoint: `/api/rsforms/${target}/versions/${version}`,
+      request: request
+    });
+  }
+}
+
+export function getTRSFile(target: string, version: string, request: FrontPull<Blob>) {
+  if (!version) {
+    AxiosGet({
+      endpoint: `/api/rsforms/${target}/export-trs`,
+      request: request,
+      options: { responseType: 'blob' }
+    });
+  } else {
+    AxiosGet({
+      endpoint: `/api/versions/${version}/export-file`,
+      request: request,
+      options: { responseType: 'blob' }
+    });
+  }
+}
+
+export function postCreateConstituenta(schema: string, request: FrontExchange<ICstCreateData, ICstCreatedResponse>) {
+  AxiosPost({
+    endpoint: `/api/rsforms/${schema}/cst-create`,
+    request: request
+  });
+}
+
+export function patchDeleteConstituenta(schema: string, request: FrontExchange<IConstituentaList, IRSFormData>) {
+  AxiosPatch({
+    endpoint: `/api/rsforms/${schema}/cst-delete-multiple`,
+    request: request
+  });
+}
+
+export function patchRenameConstituenta(schema: string, request: FrontExchange<ICstRenameData, ICstCreatedResponse>) {
+  AxiosPatch({
+    endpoint: `/api/rsforms/${schema}/cst-rename`,
+    request: request
+  });
+}
+
+export function patchProduceStructure(schema: string, request: FrontExchange<ITargetCst, IProduceStructureResponse>) {
+  AxiosPatch({
+    endpoint: `/api/rsforms/${schema}/cst-produce-structure`,
+    request: request
+  });
+}
+
+export function patchSubstituteConstituents(schema: string, request: FrontExchange<ICstSubstituteData, IRSFormData>) {
+  AxiosPatch({
+    endpoint: `/api/rsforms/${schema}/cst-substitute`,
+    request: request
+  });
+}
+
+export function patchMoveConstituenta(schema: string, request: FrontExchange<ICstMovetoData, IRSFormData>) {
+  AxiosPatch({
+    endpoint: `/api/rsforms/${schema}/cst-moveto`,
+    request: request
+  });
+}
+
+export function postCheckExpression(schema: string, request: FrontExchange<IRSExpression, IExpressionParse>) {
+  AxiosPost({
+    endpoint: `/api/rsforms/${schema}/check`,
+    request: request
+  });
+}
+
+export function patchResetAliases(target: string, request: FrontPull<IRSFormData>) {
+  AxiosPatch({
+    endpoint: `/api/rsforms/${target}/reset-aliases`,
+    request: request
+  });
+}
+
+export function patchRestoreOrder(target: string, request: FrontPull<IRSFormData>) {
+  AxiosPatch({
+    endpoint: `/api/rsforms/${target}/restore-order`,
+    request: request
+  });
+}
+
+export function patchUploadTRS(target: string, request: FrontExchange<IRSFormUploadData, IRSFormData>) {
+  AxiosPatch({
+    endpoint: `/api/rsforms/${target}/load-trs`,
+    request: request,
+    options: {
+      headers: {
+        'Content-Type': 'multipart/form-data'
+      }
+    }
+  });
+}
+
+export function postCreateVersion(target: string, request: FrontExchange<IVersionData, IVersionCreatedResponse>) {
+  AxiosPost({
+    endpoint: `/api/rsforms/${target}/versions/create`,
+    request: request
+  });
+}
diff --git a/rsconcept/frontend/src/backend/users.ts b/rsconcept/frontend/src/backend/users.ts
new file mode 100644
index 00000000..eda6ef97
--- /dev/null
+++ b/rsconcept/frontend/src/backend/users.ts
@@ -0,0 +1,99 @@
+/**
+ * Endpoints: users.
+ */
+
+import {
+  ICurrentUser,
+  IPasswordTokenData,
+  IRequestPasswordData,
+  IResetPasswordData,
+  IUserInfo,
+  IUserLoginData,
+  IUserProfile,
+  IUserSignupData,
+  IUserUpdateData,
+  IUserUpdatePassword
+} from '@/models/user';
+
+import { AxiosGet, AxiosPatch, AxiosPost, FrontAction, FrontExchange, FrontPull, FrontPush } from './apiTransport';
+
+export function getAuth(request: FrontPull<ICurrentUser>) {
+  AxiosGet({
+    endpoint: `/users/api/auth`,
+    request: request
+  });
+}
+
+export function postLogin(request: FrontPush<IUserLoginData>) {
+  AxiosPost({
+    endpoint: '/users/api/login',
+    request: request
+  });
+}
+
+export function postLogout(request: FrontAction) {
+  AxiosPost({
+    endpoint: '/users/api/logout',
+    request: request
+  });
+}
+
+export function postSignup(request: FrontExchange<IUserSignupData, IUserProfile>) {
+  AxiosPost({
+    endpoint: '/users/api/signup',
+    request: request
+  });
+}
+
+export function getProfile(request: FrontPull<IUserProfile>) {
+  AxiosGet({
+    endpoint: '/users/api/profile',
+    request: request
+  });
+}
+
+export function patchProfile(request: FrontExchange<IUserUpdateData, IUserProfile>) {
+  AxiosPatch({
+    endpoint: '/users/api/profile',
+    request: request
+  });
+}
+
+export function patchPassword(request: FrontPush<IUserUpdatePassword>) {
+  AxiosPatch({
+    endpoint: '/users/api/change-password',
+    request: request
+  });
+}
+
+export function postRequestPasswordReset(request: FrontPush<IRequestPasswordData>) {
+  // title: 'Request password reset',
+  AxiosPost({
+    endpoint: '/users/api/password-reset',
+    request: request
+  });
+}
+
+export function postValidatePasswordToken(request: FrontPush<IPasswordTokenData>) {
+  // title: 'Validate password token',
+  AxiosPost({
+    endpoint: '/users/api/password-reset/validate',
+    request: request
+  });
+}
+
+export function postResetPassword(request: FrontPush<IResetPasswordData>) {
+  // title: 'Reset password',
+  AxiosPost({
+    endpoint: '/users/api/password-reset/confirm',
+    request: request
+  });
+}
+
+export function getActiveUsers(request: FrontPull<IUserInfo[]>) {
+  // title: 'Active users list',
+  AxiosGet({
+    endpoint: '/users/api/active-users',
+    request: request
+  });
+}
diff --git a/rsconcept/frontend/src/backend/versions.ts b/rsconcept/frontend/src/backend/versions.ts
new file mode 100644
index 00000000..e04e5206
--- /dev/null
+++ b/rsconcept/frontend/src/backend/versions.ts
@@ -0,0 +1,30 @@
+/**
+ * Endpoints: versions.
+ */
+
+import { IVersionData } from '@/models/library';
+import { IRSFormData } from '@/models/rsform';
+
+import { AxiosDelete, AxiosPatch, FrontAction, FrontPull, FrontPush } from './apiTransport';
+
+export function patchVersion(target: string, request: FrontPush<IVersionData>) {
+  // title: `Version id=${target}`,
+  AxiosPatch({
+    endpoint: `/api/versions/${target}`,
+    request: request
+  });
+}
+
+export function patchRestoreVersion(target: string, request: FrontPull<IRSFormData>) {
+  AxiosPatch({
+    endpoint: `/api/versions/${target}/restore`,
+    request: request
+  });
+}
+
+export function deleteVersion(target: string, request: FrontAction) {
+  AxiosDelete({
+    endpoint: `/api/versions/${target}`,
+    request: request
+  });
+}
diff --git a/rsconcept/frontend/src/context/AuthContext.tsx b/rsconcept/frontend/src/context/AuthContext.tsx
index 073ec11d..ef9e9355 100644
--- a/rsconcept/frontend/src/context/AuthContext.tsx
+++ b/rsconcept/frontend/src/context/AuthContext.tsx
@@ -2,8 +2,8 @@
 
 import { createContext, useCallback, useContext, useLayoutEffect, useState } from 'react';
 
+import { DataCallback } from '@/backend/apiTransport';
 import {
-  type DataCallback,
   getAuth,
   patchPassword,
   postLogin,
@@ -12,7 +12,7 @@ import {
   postResetPassword,
   postSignup,
   postValidatePasswordToken
-} from '@/app/backendAPI';
+} from '@/backend/users';
 import { type ErrorData } from '@/components/info/InfoError';
 import {
   ICurrentUser,
diff --git a/rsconcept/frontend/src/context/LibraryContext.tsx b/rsconcept/frontend/src/context/LibraryContext.tsx
index 3561ecd0..a1b8f167 100644
--- a/rsconcept/frontend/src/context/LibraryContext.tsx
+++ b/rsconcept/frontend/src/context/LibraryContext.tsx
@@ -2,17 +2,16 @@
 
 import { createContext, useCallback, useContext, useEffect, useMemo, useState } from 'react';
 
+import { DataCallback } from '@/backend/apiTransport';
 import {
-  DataCallback,
   deleteLibraryItem,
   getAdminLibrary,
   getLibrary,
-  getRSFormDetails,
   getTemplates,
   postCloneLibraryItem,
-  postCreateLibraryItem,
-  postRSFormFromFile
-} from '@/app/backendAPI';
+  postCreateLibraryItem
+} from '@/backend/library';
+import { getRSFormDetails, postRSFormFromFile } from '@/backend/rsforms';
 import { ErrorData } from '@/components/info/InfoError';
 import { FolderTree } from '@/models/FolderTree';
 import { ILibraryItem, LibraryItemID, LocationHead } from '@/models/library';
diff --git a/rsconcept/frontend/src/context/OssContext.tsx b/rsconcept/frontend/src/context/OssContext.tsx
index fc67fdce..da041282 100644
--- a/rsconcept/frontend/src/context/OssContext.tsx
+++ b/rsconcept/frontend/src/context/OssContext.tsx
@@ -2,19 +2,17 @@
 
 import { createContext, useCallback, useContext, useMemo, useState } from 'react';
 
+import { DataCallback } from '@/backend/apiTransport';
 import {
-  type DataCallback,
   deleteUnsubscribe,
-  patchDeleteOperation,
-  patchEditorsSet as patchSetEditors,
+  patchEditorsSet,
   patchLibraryItem,
   patchSetAccessPolicy,
   patchSetLocation,
   patchSetOwner,
-  patchUpdatePositions,
-  postCreateOperation,
   postSubscribe
-} from '@/app/backendAPI';
+} from '@/backend/library';
+import { patchDeleteOperation, patchUpdatePositions, postCreateOperation } from '@/backend/oss';
 import { type ErrorData } from '@/components/info/InfoError';
 import useOssDetails from '@/hooks/useOssDetails';
 import { AccessPolicy, ILibraryItem } from '@/models/library';
@@ -238,7 +236,7 @@ export const OssState = ({ itemID, children }: OssStateProps) => {
         return;
       }
       setProcessingError(undefined);
-      patchSetEditors(itemID, {
+      patchEditorsSet(itemID, {
         data: {
           users: newEditors
         },
diff --git a/rsconcept/frontend/src/context/RSFormContext.tsx b/rsconcept/frontend/src/context/RSFormContext.tsx
index 211e4fbf..3a193059 100644
--- a/rsconcept/frontend/src/context/RSFormContext.tsx
+++ b/rsconcept/frontend/src/context/RSFormContext.tsx
@@ -2,32 +2,32 @@
 
 import { createContext, useCallback, useContext, useMemo, useState } from 'react';
 
+import { DataCallback } from '@/backend/apiTransport';
+import { patchConstituenta } from '@/backend/constituents';
 import {
-  type DataCallback,
   deleteUnsubscribe,
-  deleteVersion,
-  getTRSFile,
-  patchConstituenta,
-  patchDeleteConstituenta,
-  patchEditorsSet as patchSetEditors,
-  patchInlineSynthesis,
+  patchEditorsSet,
   patchLibraryItem,
+  patchSetAccessPolicy,
+  patchSetLocation,
+  patchSetOwner,
+  postSubscribe
+} from '@/backend/library';
+import { patchInlineSynthesis } from '@/backend/operations';
+import {
+  getTRSFile,
+  patchDeleteConstituenta,
   patchMoveConstituenta,
   patchProduceStructure,
   patchRenameConstituenta,
   patchResetAliases,
   patchRestoreOrder,
-  patchRestoreVersion,
-  patchSetAccessPolicy,
-  patchSetLocation,
-  patchSetOwner,
   patchSubstituteConstituents,
   patchUploadTRS,
-  patchVersion,
   postCreateConstituenta,
-  postCreateVersion,
-  postSubscribe
-} from '@/app/backendAPI';
+  postCreateVersion
+} from '@/backend/rsforms';
+import { deleteVersion, patchRestoreVersion, patchVersion } from '@/backend/versions';
 import { type ErrorData } from '@/components/info/InfoError';
 import useRSFormDetails from '@/hooks/useRSFormDetails';
 import { AccessPolicy, ILibraryItem, IVersionData, VersionID } from '@/models/library';
@@ -309,7 +309,7 @@ export const RSFormState = ({ itemID, versionID, children }: RSFormStateProps) =
         return;
       }
       setProcessingError(undefined);
-      patchSetEditors(itemID, {
+      patchEditorsSet(itemID, {
         data: {
           users: newEditors
         },
diff --git a/rsconcept/frontend/src/context/UserProfileContext.tsx b/rsconcept/frontend/src/context/UserProfileContext.tsx
index 7c39352e..cd6d695b 100644
--- a/rsconcept/frontend/src/context/UserProfileContext.tsx
+++ b/rsconcept/frontend/src/context/UserProfileContext.tsx
@@ -2,7 +2,8 @@
 
 import { createContext, useCallback, useContext, useEffect, useState } from 'react';
 
-import { DataCallback, getProfile, patchProfile } from '@/app/backendAPI';
+import { DataCallback } from '@/backend/apiTransport';
+import { getProfile, patchProfile } from '@/backend/users';
 import { ErrorData } from '@/components/info/InfoError';
 import { IUserProfile, IUserUpdateData } from '@/models/user';
 import { contextOutsideScope } from '@/utils/labels';
diff --git a/rsconcept/frontend/src/context/UsersContext.tsx b/rsconcept/frontend/src/context/UsersContext.tsx
index 2c966a6e..9ad93863 100644
--- a/rsconcept/frontend/src/context/UsersContext.tsx
+++ b/rsconcept/frontend/src/context/UsersContext.tsx
@@ -2,7 +2,7 @@
 
 import { createContext, useCallback, useContext, useEffect, useState } from 'react';
 
-import { getActiveUsers } from '@/app/backendAPI';
+import { getActiveUsers } from '@/backend/users';
 import { IUserInfo } from '@/models/user';
 import { contextOutsideScope } from '@/utils/labels';
 
diff --git a/rsconcept/frontend/src/hooks/useCheckExpression.ts b/rsconcept/frontend/src/hooks/useCheckExpression.ts
index 7d711b20..6a16c807 100644
--- a/rsconcept/frontend/src/hooks/useCheckExpression.ts
+++ b/rsconcept/frontend/src/hooks/useCheckExpression.ts
@@ -2,7 +2,8 @@
 
 import { useCallback, useState } from 'react';
 
-import { DataCallback, postCheckExpression } from '@/app/backendAPI';
+import { DataCallback } from '@/backend/apiTransport';
+import { postCheckExpression } from '@/backend/rsforms';
 import { type ErrorData } from '@/components/info/InfoError';
 import { CstType, IConstituenta, type IRSForm } from '@/models/rsform';
 import { getDefinitionPrefix } from '@/models/rsformAPI';
diff --git a/rsconcept/frontend/src/hooks/useConceptText.ts b/rsconcept/frontend/src/hooks/useConceptText.ts
index 661d6ee7..ebb1bea7 100644
--- a/rsconcept/frontend/src/hooks/useConceptText.ts
+++ b/rsconcept/frontend/src/hooks/useConceptText.ts
@@ -2,7 +2,8 @@
 
 import { useCallback, useState } from 'react';
 
-import { DataCallback, postGenerateLexeme, postInflectText, postParseText } from '@/app/backendAPI';
+import { DataCallback } from '@/backend/apiTransport';
+import { postGenerateLexeme, postInflectText, postParseText } from '@/backend/cctext';
 import { ErrorData } from '@/components/info/InfoError';
 import { ILexemeData, ITextRequest, ITextResult, IWordFormPlain } from '@/models/language';
 
diff --git a/rsconcept/frontend/src/hooks/useOssDetails.ts b/rsconcept/frontend/src/hooks/useOssDetails.ts
index 7fd14aeb..8cafd64a 100644
--- a/rsconcept/frontend/src/hooks/useOssDetails.ts
+++ b/rsconcept/frontend/src/hooks/useOssDetails.ts
@@ -2,7 +2,7 @@
 
 import { useCallback, useEffect, useState } from 'react';
 
-import { getOssDetails } from '@/app/backendAPI';
+import { getOssDetails } from '@/backend/oss';
 import { type ErrorData } from '@/components/info/InfoError';
 import { useAuth } from '@/context/AuthContext';
 import { IOperationSchema, IOperationSchemaData } from '@/models/oss';
diff --git a/rsconcept/frontend/src/hooks/useRSFormDetails.ts b/rsconcept/frontend/src/hooks/useRSFormDetails.ts
index ce6025a9..846a1d71 100644
--- a/rsconcept/frontend/src/hooks/useRSFormDetails.ts
+++ b/rsconcept/frontend/src/hooks/useRSFormDetails.ts
@@ -2,7 +2,7 @@
 
 import { useCallback, useEffect, useState } from 'react';
 
-import { getRSFormDetails } from '@/app/backendAPI';
+import { getRSFormDetails } from '@/backend/rsforms';
 import { type ErrorData } from '@/components/info/InfoError';
 import { useAuth } from '@/context/AuthContext';
 import { IRSForm, IRSFormData } from '@/models/rsform';