Method get

app/api/imageuploads.py:30–135

Generate a thumbnail on the fly for a particular task's image

(self, request, pk=None, project_pk=None, image_filename="")

class Thumbnail(TaskNestedView):
    def get(self, request, pk=None, project_pk=None, image_filename=""):
        """
        Generate a thumbnail on the fly for a particular task's image
        """
        task = self.get_and_check_task(request, pk)
        image_path = task.get_image_path(image_filename)
        if not os.path.isfile(image_path):
            raise exceptions.NotFound()

        try:
            thumb_size = int(self.request.query_params.get('size', 512))
            if thumb_size < 1:
                raise ValueError()

            quality = int(self.request.query_params.get('quality', 75))
            if quality < 0 or quality > 100:
                raise ValueError()
                
            center_x = float(self.request.query_params.get('center_x', '0.5'))
            center_y = float(self.request.query_params.get('center_y', '0.5'))
            if center_x < -0.5 or center_x > 1.5 or center_y < -0.5 or center_y > 1.5:
                raise ValueError()

            draw_points = self.request.query_params.getlist('draw_point')
            point_colors = self.request.query_params.getlist('point_color')
            point_radiuses = self.request.query_params.getlist('point_radius')
            
            points = []
            i = 0
            for p in draw_points:
                coords = list(map(float, p.split(",")))
                if len(coords) != 2:
                    raise ValueError()

                points.append({
                    'x': coords[0],
                    'y': coords[1],
                    'color': hex2rgb(point_colors[i]) if i < len(point_colors) else (255, 255, 255),
                    'radius': float(point_radiuses[i]) if i < len(point_radiuses) else 1.0,
                })

                i += 1
            
            zoom = float(self.request.query_params.get('zoom', '1'))
            if zoom < 0.1 or zoom > 10:
                raise ValueError()

        except ValueError:
            raise exceptions.ValidationError("Invalid query parameters")

        with Image.open(image_path) as img:
            if img.mode != 'RGB':
                img = normalize(img)
                img = img.convert('RGB')
            w, h = img.size
            thumb_size = min(max(w, h), thumb_size)
            
            # Move image center