From 14c0da6ab25ccf398626694af0fb8a38c6ef47fd Mon Sep 17 00:00:00 2001
From: Anton Akhmerov <anton.akhmerov@gmail.com>
Date: Mon, 26 Mar 2018 01:42:32 +0200
Subject: [PATCH] implement solution images endpoint
---
zesje/api.py | 6 +++++
zesje/resources/images.py | 47 +++++++++++++++++++++++++++++++++++++++
2 files changed, 53 insertions(+)
create mode 100644 zesje/resources/images.py
diff --git a/zesje/api.py b/zesje/api.py
index 3c33101e3..84b630313 100644
--- a/zesje/api.py
+++ b/zesje/api.py
@@ -7,6 +7,7 @@ from .resources.pdfs import Pdfs
from .resources.students import Students
from .resources.submissions import Submissions
from .resources import signature
+from .resources import images
from .resources.problems import Problems
from .resources.feedback import Feedback
@@ -41,3 +42,8 @@ api_bp.add_url_rule(
'signature',
signature.get,
)
+api_bp.add_url_rule(
+ '/images/solutions/<int:exam_id>/<int:problem_id>/<int:submission_id>',
+ 'solution',
+ images.get,
+)
diff --git a/zesje/resources/images.py b/zesje/resources/images.py
new file mode 100644
index 000000000..ed8737fc7
--- /dev/null
+++ b/zesje/resources/images.py
@@ -0,0 +1,47 @@
+import os
+from flask import abort, Response, current_app as app
+from pony import orm
+
+from ..helpers import yaml_helper, image_helper
+from ..models import Exam, Submission, Solution, Problem
+
+
+@orm.db_session
+def get(exam_id, problem_id, submission_id):
+ """get student signature for the given submission.
+
+ Parameters
+ ----------
+ exam_id : int
+ problem_id : int
+ submission_id : int
+ The copy number of the submission. This uniquely identifies
+ the submission *within a given exam*.
+
+ Returns
+ -------
+ Image (JPEG mimetype)
+ """
+ try:
+ exam = Exam[exam_id]
+ sub = Submission.get(exam=exam, copy_number=submission_id)
+ name = Problem[problem_id].name
+ except (KeyError, ValueError):
+ abort(404)
+
+ data_dir = app.config['DATA_DIRECTORY']
+ yaml_abspath = os.path.join(data_dir, sub.exam.yaml_path)
+ *_, widgets = yaml_helper.parse(yaml_helper.read(yaml_abspath))
+ problem_metadata = widgets.loc[name]
+ page = f'page{int(problem_metadata.page)}.'
+ page_path = (
+ sub.pages
+ .select(lambda p: page in p.path)
+ .first().path
+ )
+ image = image_helper.get_widget_image(
+ page_path,
+ problem_metadata
+ )
+
+ return Response(image, 200, mimetype='image/jpeg')
--
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