Added article get endpoint

api.yaml

@@ -147,6 +147,49 @@ paths:
                   $ref: '#/components/schemas/ArticleSummary'
 
   /api/article:
+    get:
+      summary: Get an article by its id
+      parameters:
+        - in: query
+          name: id
+          schema:
+            type: number
+          description: The id of the article
+      security:
+        - cookie: []
+      responses:
+        200:
+          description: OK
+          content:
+            application/json:
+              schema:
+                type: object
+                properties:
+                  title:
+                    type: string
+                    description: The title of the article
+                  summary:
+                    type: string
+                    description: The articles' summary
+                  authors:
+                    type: array
+                    items:
+                      type: number
+                    description: A array of author ids which have been worked on it
+                  image:
+                    type: string
+                    description: A (optional) preview image
+                  tags:
+                    type: array
+                    items:
+                      type: string
+                    description: A array of tags which are set to the article
+                  link:
+                    type: string
+                    description: The link name (last path of the url) which redirects to the article
+                  content:
+                    type: string
+                    description: The article itself (its content), encoded as base64
     post:
       summary: Uploads a new article
       requestBody: