Fix image export in QTI exercise publishing

contentcuration/contentcuration/tests/utils/test_exercise_creation.py

@@ -1568,7 +1568,7 @@ def test_exercise_with_image(self):
     <resources>
         <resource identifier="KERGqqiIiu7szM8zMRETd3Q" type="imsqti_item_xmlv3p0" href="items/KERGqqiIiu7szM8zMRETd3Q.xml">
             <file href="items/KERGqqiIiu7szM8zMRETd3Q.xml" />
-            <file href="{image_path}" />
+            <file href="images/{image_file.filename()}" />
         </resource>
     </resources>
 </manifest>"""
@@ -1579,7 +1579,103 @@ def test_exercise_with_image(self):
             self._normalize_xml(actual_manifest_xml),
         )
 
-        self.assertEqual(exercise_file.checksum, "51ba0d6e3c7f30239265c5294abe6ac5")
+        self.assertEqual(exercise_file.checksum, "8df26b0c7009ae84fe148cceda8e0138")
+
+    def test_image_resizing(self):
+        # Create a base image file
+        base_image = fileobj_exercise_image(size=(400, 300), color="blue")
+        base_image_url = exercises.CONTENT_STORAGE_FORMAT.format(base_image.filename())
+
+        # For questions, test multiple sizes of the same image
+        question_text = (
+            f"First resized image: ![shape1]({base_image_url} =200x150)\n\n"
+            f"Second resized image (same): ![shape2]({base_image_url} =200x150)\n\n"
+            f"Third resized image (different): ![shape3]({base_image_url} =100x75)"
+        )
+        answers = [{"answer": "Answer A", "correct": True, "order": 1}]
+        hints = [{"hint": "Hint text", "order": 1}]
+
+        # Create the assessment item
+        item_type = exercises.SINGLE_SELECTION
+
+        item = self._create_assessment_item(item_type, question_text, answers, hints)
+
+        # Associate the image with the assessment item
+        base_image.assessment_item = item
+        base_image.save()
+
+        # Create exercise data
+        exercise_data = {
+            "mastery_model": exercises.M_OF_N,
+            "randomize": True,
+            "n": 2,
+            "m": 1,
+            "all_assessment_items": [item.assessment_id],
+            "assessment_mapping": {item.assessment_id: item_type},
+        }
+
+        # Create the Perseus exercise
+        self._create_qti_zip(exercise_data)
+
+        exercise_file = self.exercise_node.files.get(preset_id=format_presets.QTI_ZIP)
+        zip_file = self._validate_qti_zip_structure(exercise_file)
+
+        # Get all image files in the zip
+        image_files = [
+            name for name in zip_file.namelist() if name.startswith("items/images/")
+        ]
+
+        # Verify we have exactly 2 image files (one for each unique size)
+        # We should have one at 200x150 and one at 100x75
+        self.assertEqual(
+            len(image_files),
+            2,
+            f"Expected 2 resized images, found {len(image_files)}: {image_files}",
+        )
+
+        # The original image should not be present unless it was referenced without resizing
+        original_image_name = f"images/{base_image.filename()}"
+        self.assertNotIn(
+            original_image_name,
+            zip_file.namelist(),
+            "Original image should not be included when only resized versions are used",
+        )
+
+        qti_id = hex_to_qti_id(item.assessment_id)
+
+        # Check the QTI XML for mathematical content conversion to MathML
+        expected_item_file = f"items/{qti_id}.xml"
+        actual_item_xml = zip_file.read(expected_item_file).decode("utf-8")
+
+        # Expected QTI item XML content with MathML conversion
+        expected_item_xml = f"""<?xml version="1.0" encoding="UTF-8"?>
+        <qti-assessment-item xmlns="http://www.imsglobal.org/xsd/imsqtiasi_v3p0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.imsglobal.org/xsd/imsqtiasi_v3p0 https://purl.imsglobal.org/spec/qti/v3p0/schema/xsd/imsqti_asiv3p0p1_v1p0.xsd" identifier="{qti_id}" title="Test QTI Exercise 1" adaptive="false" time-dependent="false" language="en-US" tool-name="kolibri" tool-version="0.1">
+        <qti-response-declaration identifier="RESPONSE" cardinality="single" base-type="identifier">
+        <qti-correct-response>
+        <qti-value>choice_0</qti-value>
+        </qti-correct-response>
+        </qti-response-declaration>
+        <qti-outcome-declaration identifier="SCORE" cardinality="single" base-type="float" />
+        <qti-item-body>
+        <qti-choice-interaction response-identifier="RESPONSE" shuffle="true" max-choices="1" min-choices="0" orientation="vertical">
+        <qti-prompt>
+            <p>First resized image: <img alt="shape1" src="images/b8f3062ca5795e39ff813958296b4884.jpg" /></p>
+            <p>Second resized image (same): <img alt="shape2" src="images/b8f3062ca5795e39ff813958296b4884.jpg" /></p>
+            <p>Third resized image (different): <img alt="shape3" src="images/abb0589d29a3852a5ebfd2726a832761.jpg" /></p>
+        </qti-prompt>
+        <qti-simple-choice identifier="choice_0" show-hide="show" fixed="false">
+        <p>Answer A</p>
+        </qti-simple-choice>
+        </qti-choice-interaction>
+        </qti-item-body>
+        <qti-response-processing template="https://purl.imsglobal.org/spec/qti/v3p0/rptemplates/match_correct" />
+        </qti-assessment-item>"""
+
+        # Compare normalized XML
+        self.assertEqual(
+            self._normalize_xml(expected_item_xml),
+            self._normalize_xml(actual_item_xml),
+        )
 
     def test_question_with_mathematical_content(self):
         """Test QTI generation for questions containing mathematical formulas converted to MathML"""

contentcuration/contentcuration/utils/assessment/base.py

@@ -47,6 +47,8 @@ class ExerciseArchiveGenerator(ABC):
     ZIP_DATE_TIME = (2015, 10, 21, 7, 28, 0)
     ZIP_COMPRESS_TYPE = zipfile.ZIP_DEFLATED
     ZIP_COMMENT = "".encode()
+    # Whether to keep width/height in image refs
+    RETAIN_IMAGE_DIMENSIONS = True
 
     @property
     @abstractmethod
@@ -68,12 +70,13 @@ def get_image_file_path(self):
         """
         pass
 
+    @abstractmethod
     def get_image_ref_prefix(self):
         """
-        A value to insert in front of the image file path - this is needed for Perseus to properly
-        find all image file paths in the frontend.
+        A value to insert in front of the image path - this adds both the special placeholder
+        that our Perseus viewer uses to find images, and the relative path to the images directory.
         """
-        return ""
+        pass
 
     @abstractmethod
     def create_assessment_item(self, assessment_item, processed_data):
@@ -203,6 +206,11 @@ def _replace_filename_in_match(
         start, end = img_match.span()
         old_match = content[start:end]
         new_match = old_match.replace(old_filename, new_filename)
+        if not self.RETAIN_IMAGE_DIMENSIONS:
+            # Remove dimensions from image ref
+            new_match = re.sub(
+                rf"{new_filename}\s=([0-9\.]+)x([0-9\.]+)", new_filename, new_match
+            )
         return content[:start] + new_match + content[end:]
 
     def _is_valid_image_filename(self, filename):
@@ -231,7 +239,7 @@ def _is_valid_image_filename(self, filename):
 
     def process_image_strings(self, content):
         new_file_path = self.get_image_file_path()
-        new_image_path = f"{self.get_image_ref_prefix()}{new_file_path}"
+        new_image_path = self.get_image_ref_prefix()
         image_list = []
         processed_files = []
         for img_match in re.finditer(image_pattern, content):

contentcuration/contentcuration/utils/assessment/perseus.py

@@ -119,7 +119,7 @@ def get_image_file_path(self):
         return "images"
 
     def get_image_ref_prefix(self):
-        return f"${exercises.IMG_PLACEHOLDER}/"
+        return f"${exercises.IMG_PLACEHOLDER}/images"
 
     def handle_before_assessment_items(self):
         exercise_context = {

contentcuration/contentcuration/utils/assessment/qti/archive.py

@@ -64,6 +64,8 @@ class QTIExerciseGenerator(ExerciseArchiveGenerator):
 
     file_format = "zip"
     preset = format_presets.QTI_ZIP
+    # Our markdown parser does not handle width/height in image refs
+    RETAIN_IMAGE_DIMENSIONS = False
 
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
@@ -73,6 +75,13 @@ def get_image_file_path(self) -> str:
         """Get the file path for QTI assessment items."""
         return "items/images"
 
+    def get_image_ref_prefix(self):
+        """
+        Because we put items in a subdirectory, we need to prefix the image paths
+        with the relative path to the images directory.
+        """
+        return "images"
+
     def _create_html_content_from_text(self, text: str) -> FlowContentList:
         """Convert text content to QTI HTML flow content."""
         if not text.strip():