def generate_gpx()

in backend/services/mapping_service.py [0:0]

• 50 lines of code
• 10 McCabe index (conditional complexity)

    def generate_gpx(project_id: int, task_ids_str: str, timestamp=None):
        """
        Creates a GPX file for supplied tasks.  Timestamp is for unit testing only.
        You can use the following URL to test locally:
        http://www.openstreetmap.org/edit?editor=id&#map=11/31.50362930069913/34.628906243797054&comment=CHANGSET_COMMENT&gpx=http://localhost:5000/api/v2/projects/{project_id}/tasks/queries/gpx%3Ftasks=2
        """

        if timestamp is None:
            timestamp = datetime.datetime.utcnow()

        root = ET.Element(
            "gpx",
            attrib=dict(
                xmlns="http://www.topografix.com/GPX/1/1",
                version="1.1",
                creator="HOT Tasking Manager",
            ),
        )

        # Create GPX Metadata element
        metadata = ET.Element("metadata")
        link = ET.SubElement(
            metadata,
            "link",
            attrib=dict(href="https://github.com/hotosm/tasking-manager"),
        )
        ET.SubElement(link, "text").text = "HOT Tasking Manager"
        ET.SubElement(metadata, "time").text = timestamp.isoformat()
        root.append(metadata)

        # Create trk element
        trk = ET.Element("trk")
        root.append(trk)
        ET.SubElement(
            trk, "name"
        ).text = f"Task for project {project_id}. Do not edit outside of this area!"

        # Construct trkseg elements
        if task_ids_str is not None:
            task_ids = map(int, task_ids_str.split(","))
            tasks = Task.get_tasks(project_id, task_ids)
            if not tasks or len(tasks) == 0:
                raise NotFound()
        else:
            tasks = Task.get_all_tasks(project_id)
            if not tasks or len(tasks) == 0:
                raise NotFound()

        for task in tasks:
            task_geom = shape.to_shape(task.geometry)
            for poly in task_geom:
                trkseg = ET.SubElement(trk, "trkseg")
                for point in poly.exterior.coords:
                    ET.SubElement(
                        trkseg,
                        "trkpt",
                        attrib=dict(lon=str(point[0]), lat=str(point[1])),
                    )

                    # Append wpt elements to end of doc
                    wpt = ET.Element(
                        "wpt", attrib=dict(lon=str(point[0]), lat=str(point[1]))
                    )
                    root.append(wpt)

        xml_gpx = ET.tostring(root, encoding="utf8")
        return xml_gpx