feat: tag count

Closes #46

fediseer/apis/models/v1.py

@@ -170,3 +170,7 @@ class Models:
             'overwrite': fields.Boolean(required=False, default=False, description="Set to true, to modify all existing entries with new data."),
             'hesitations': fields.List(fields.Nested(self.input_batch_entry)),
         })
+        self.response_model_tag_info = api.model('TagsInfo', {
+            'tag': fields.String(description="The tag name (lowercased)", example="anarchism"),
+            'count': fields.Integer(description="The amount of instances tagged with this tag", example="5"),
+        })

fediseer/apis/v1/tags.py

@@ -5,6 +5,24 @@ from fediseer.consts import MAX_TAGS
 
 class Tags(Resource):
 
+    get_parser = reqparse.RequestParser()
+    get_parser.add_argument("Client-Agent", default="unknown:0:unknown", type=str, required=False, help="The client name and version.", location="headers")
+
+    @api.expect(get_parser)
+    @api.marshal_with(models.response_model_tag_info, code=200, description='Tag counts', as_list=True)
+    @api.response(400, 'Bad Request', models.response_model_error)
+    @api.response(401, 'Invalid API Key', models.response_model_error)
+    @api.response(403, 'Access Denied', models.response_model_error)
+
+    def get(self):
+        '''Display all known tags (converted to lowercase)
+        And count how many times they've been used
+        '''
+        self.args = self.get_parser.parse_args()
+        rows_dict = database.get_tag_counts()
+        tags = [{"tag":tag, "count": rows_dict[tag]} for tag in rows_dict]
+        return tags,200
+        
     put_parser = reqparse.RequestParser()
     put_parser.add_argument("apikey", type=str, required=True, help="The sending instance's API key.", location='headers')
     put_parser.add_argument("Client-Agent", default="unknown:0:unknown", type=str, required=False, help="The client name and version.", location="headers")

fediseer/database/functions.py

@@ -540,4 +540,15 @@ def count_instance_tags(instance_id):
     query = InstanceTag.query.filter(
         InstanceTag.instance_id == instance_id,
     )
-    return query.count()
+    return query.count()
+
+def get_tag_counts():
+    query = db.session.query(
+        func.lower(InstanceTag.tag).label('tag'),
+        func.count().label('tag_count')
+    ).group_by(InstanceTag.tag)
+
+    result = query.all()
+
+    tag_counts = {row.tag: row.tag_count for row in result}
+    return tag_counts