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""" |
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Flask Imagine extension. |
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""" |
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import logging |
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from flask import current_app, abort, redirect |
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from .adapters import ImagineFilesystemAdapter |
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from .filters import AutorotateFilter, ThumbnailFilter |
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from .filters.interface import ImagineFilterInterface |
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from .helpers.regex_route import RegexConverter |
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__all__ = ['Imagine', 'imagine_filter'] |
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LOGGER = logging.getLogger(__file__) |
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class Imagine(object): |
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""" |
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Flask Imagine extension |
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""" |
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filter_sets = {} |
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adapter = None |
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def __init__(self, app=None): |
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""" |
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:param app: Flask application |
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:return: |
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""" |
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if app is not None: |
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self.init_app(app) |
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def init_app(self, app): |
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""" |
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:param app: Flask application |
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:return: |
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""" |
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if not hasattr(app, 'extensions'): |
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app.extensions = {} |
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app.extensions['imagine'] = self |
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self._set_defaults(app) |
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self._handle_adapter(app) |
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self._handle_filter_sets(app) |
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self._add_url_rule(app) |
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self._add_template_filter(app) |
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@classmethod |
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def _set_defaults(cls, app): |
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""" |
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Set default configuration parameters |
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:param app: Flask application |
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:return: |
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""" |
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app.config.setdefault('IMAGINE_URL', '/media/cache/resolve') |
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app.config.setdefault('IMAGINE_NAME', 'imagine') |
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app.config.setdefault('IMAGINE_THUMBS_PATH', 'cache/') |
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app.config.setdefault('IMAGINE_CACHE_ENABLED', True) |
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app.config.setdefault('IMAGINE_ADAPTERS', { |
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'fs': ImagineFilesystemAdapter, |
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}) |
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app.config.setdefault('IMAGINE_FILTERS', { |
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'autorotate': AutorotateFilter, |
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'thumbnail': ThumbnailFilter |
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}) |
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app.config.setdefault('IMAGINE_ADAPTER', { |
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'name': 'fs', |
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'source_folder': '/static/', |
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'cache_folder': '/cache/' |
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}) |
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app.config.setdefault('IMAGINE_FILTER_SETS', {}) |
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return app |
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def _handle_adapter(self, app): |
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""" |
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Handle storage adapter configuration |
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:param app: Flask application |
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:return: |
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""" |
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if 'IMAGINE_ADAPTER' in app.config \ |
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and 'name' in app.config['IMAGINE_ADAPTER'] \ |
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and app.config['IMAGINE_ADAPTER']['name'] in app.config['IMAGINE_ADAPTERS'].keys(): |
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self.adapter = app.config['IMAGINE_ADAPTERS'][app.config['IMAGINE_ADAPTER']['name']]( |
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**app.config['IMAGINE_ADAPTER'] |
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) |
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else: |
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raise ValueError('Unknown adapter type') |
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def _handle_filter_sets(self, app): |
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""" |
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Handle filter sets |
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:param app: Flask application |
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:return: |
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""" |
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if 'IMAGINE_FILTER_SETS' in app.config and isinstance(app.config['IMAGINE_FILTER_SETS'], dict): |
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for filter_name, filters_settings in app.config['IMAGINE_FILTER_SETS'].iteritems(): |
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filter_set = [] |
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if isinstance(filters_settings, dict) and 'filters' in filters_settings: |
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for filter_type, filter_settings in filters_settings['filters'].iteritems(): |
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if filter_type in app.config['IMAGINE_FILTERS']: |
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filter_item = app.config['IMAGINE_FILTERS'][filter_type](**filter_settings) |
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if isinstance(filter_item, ImagineFilterInterface): |
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filter_set.append(filter_item) |
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else: |
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raise ValueError('Filter must be implement ImagineFilterInterface') |
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else: |
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raise ValueError('Unknown filter type: %s' % filter_type) |
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filter_config = {'filters': filter_set} |
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if 'cached' in filters_settings and filters_settings['cached']: |
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filter_config['cached'] = True |
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else: |
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filter_config['cached'] = False |
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self.filter_sets.update({filter_name: filter_config}) |
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else: |
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raise ValueError('Wrong settings for filter: %s' % filter_name) |
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else: |
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raise ValueError('Filters configuration does not present') |
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def _add_url_rule(self, app): |
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""" |
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Add url rule for get filtered images |
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:param app: Flask application |
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:return: |
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""" |
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app.url_map.converters['regex'] = RegexConverter |
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app.add_url_rule( |
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app.config['IMAGINE_URL'] + '/<regex("[^\/]+"):filter_name>/<path:path>', |
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app.config['IMAGINE_NAME'], |
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self.handle_request |
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) |
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return app |
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@classmethod |
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def _add_template_filter(cls, app): |
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""" |
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Add template filter |
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:param app: Flask application |
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:return: |
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""" |
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if hasattr(app, 'add_template_filter'): |
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app.add_template_filter(imagine_filter, 'imagine_filter') |
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else: |
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ctx = { |
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'imagine_filter': imagine_filter |
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} |
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app.context_processor(lambda: ctx) |
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return app |
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def handle_request(self, filter_name, path): |
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""" |
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Handle image request |
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:param filter_name: filter_name |
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:param path: image_path |
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:param kwargs: |
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:return: |
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""" |
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if filter_name in self.filter_sets: |
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if self.filter_sets[filter_name]['cached']: |
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if self.adapter.check_cached_item('%s/%s' % (filter_name, path)): |
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return redirect( |
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'%s/%s/%s' % ( |
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self.adapter.source_folder, |
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self.adapter.cache_folder, |
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'%s/%s' % (filter_name, path) |
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) |
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) |
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resource = self.adapter.get_item(path) |
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if resource: |
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for filter_item in self.filter_sets[filter_name]['filters']: |
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resource = filter_item.apply(resource) |
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return redirect(self.adapter.create_cached_item('%s/%s' % (filter_name, path), resource)) |
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else: |
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LOGGER.warning('File "%s" not found.' % path) |
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abort(404) |
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else: |
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LOGGER.warning('Filter "%s" not found.' % filter_name) |
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abort(404) |
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def imagine_filter(path, filter_name): |
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""" |
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Template filter |
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:param path: image path |
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:param filter_name: filter_name |
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:param kwargs: |
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:return: |
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""" |
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self = current_app.extensions['imagine'] |
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return self.build_url(path, filter_name) |
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FlaskGuys /
Flask-Imagine
