first commit

oapi_scheme.yml

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+openapi: 3.0.4
+info:
+  title: VPN Core API
+  version: 1.0.0
+
+servers:
+  - url: https://api.yourdomain.com/v1
+
+components:
+  schemas:
+
+    UserCreateRequestDTO:
+      type: object
+      required:
+        - username
+      properties:
+        username:
+          type: string
+          description: Unique username
+
+    UserResponseDTO:
+      type: object
+      properties:
+        id:
+          type: string
+          description: Internal user identifier
+
+    ConfigMetaDTO:
+      type: object
+      properties:
+        id:
+          type: string
+          description: Configuration file identifier
+        name:
+          type: string
+          description: Configuration name
+
+paths:
+
+  /users:
+    post:
+      summary: Create user
+      description: |
+        Creates a user on first request.
+        If a user with this username already exists —
+        returns the existing user.
+      requestBody:
+        required: true
+        content:
+          application/json:
+            schema:
+              $ref: "#/components/schemas/UserCreateRequestDTO"
+      responses:
+        "201":
+          description: User created
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/UserResponseDTO"
+        "200":
+          description: User already exists
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/UserResponseDTO"
+        "400":
+          description: Bad request
+
+  /configs:
+    post:
+      summary: Upload binary configuration file
+      description: |
+        Uploads a binary configuration file
+        associated with a user.
+      requestBody:
+        required: true
+        content:
+          multipart/form-data:
+            schema:
+              type: object
+              required:
+                - fileName
+              properties:
+                fileName:
+                  type: string
+                  description: Configuration file name
+      responses:
+        "201":
+          description: File successfully uploaded
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/ConfigMetaDTO"
+        "400":
+          description: Invalid input
+
+    get:
+      summary: Get user configuration files
+      description: Returns a list of all configuration files for the given user.
+      parameters:
+        - in: query
+          name: userId
+          required: true
+          schema:
+            type: string
+          description: User identifier
+      responses:
+        "200":
+          description: List of configuration files
+          content:
+            application/json:
+              schema:
+                type: array
+                items:
+                  $ref: "#/components/schemas/ConfigMetaDTO"
+        "400":
+          description: Bad request