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# -*- coding: utf-8 -*-
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"""
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flask_dropzone
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~~~~~~~~~~~~~~
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:author: Grey Li <withlihui@gmail.com>
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:copyright: (c) 2017 by Grey Li.
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:license: MIT, see LICENSE for more details.
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"""
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import warnings
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from flask import Blueprint, current_app, url_for, Markup, render_template_string
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from .utils import random_filename, get_url # noqa
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#: defined normal file type
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allowed_file_extensions = {
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'default': 'image/*, audio/*, video/*, text/*, application/*',
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'image': 'image/*',
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'audio': 'audio/*',
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'video': 'video/*',
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'text': 'text/*',
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'app': 'application/*'
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}
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class _Dropzone(object):
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@staticmethod
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def load(js_url='', css_url='', version='5.2.0'):
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"""Load Dropzone resources with given version and init dropzone configuration.
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.. versionchanged:: 1.4.3
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Added ``js_url`` and ``css_url`` parameters to pass custom resource URL.
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.. versionchanged:: 1.4.4
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This method was deprecated due to inflexible. Now it's divided into three methods:
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1. Use ``load_css()`` to load css resources.
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2. Use ``load_js()`` to load js resources.
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3. Use ``config()`` to configure Dropzone.
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:param js_url: The JavaScript url for Dropzone.js.
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:param css_url: The CSS url for Dropzone.js.
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:param version: The version of Dropzone.js.
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"""
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warnings.warn('The method will be removed in 2.0, see docs for more details.')
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js_filename = 'dropzone.min.js'
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css_filename = 'dropzone.min.css'
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upload_multiple = current_app.config['DROPZONE_UPLOAD_MULTIPLE']
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parallel_uploads = current_app.config['DROPZONE_PARALLEL_UPLOADS']
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if upload_multiple in [True, 'true', 'True', 1]:
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upload_multiple = 'true'
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else:
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upload_multiple = 'false'
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serve_local = current_app.config['DROPZONE_SERVE_LOCAL']
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size = current_app.config['DROPZONE_MAX_FILE_SIZE']
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param = current_app.config['DROPZONE_INPUT_NAME']
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redirect_view = current_app.config['DROPZONE_REDIRECT_VIEW']
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if redirect_view is not None:
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redirect_js = '''
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this.on("queuecomplete", function(file) {
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// Called when all files in the queue finish uploading.
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window.location = "%s";
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});''' % url_for(redirect_view)
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else:
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redirect_js = ''
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if not current_app.config['DROPZONE_ALLOWED_FILE_CUSTOM']:
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allowed_type = allowed_file_extensions[
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current_app.config['DROPZONE_ALLOWED_FILE_TYPE']]
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else:
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allowed_type = current_app.config['DROPZONE_ALLOWED_FILE_TYPE']
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max_files = current_app.config['DROPZONE_MAX_FILES']
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default_message = current_app.config['DROPZONE_DEFAULT_MESSAGE']
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invalid_file_type = current_app.config['DROPZONE_INVALID_FILE_TYPE']
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file_too_big = current_app.config['DROPZONE_FILE_TOO_BIG']
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server_error = current_app.config['DROPZONE_SERVER_ERROR']
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browser_unsupported = current_app.config['DROPZONE_BROWSER_UNSUPPORTED']
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max_files_exceeded = current_app.config['DROPZONE_MAX_FILE_EXCEED']
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cancelUpload = current_app.config['DROPZONE_CANCEL_UPLOAD']
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removeFile = current_app.config['DROPZONE_REMOVE_FILE']
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cancelConfirmation = current_app.config['DROPZONE_CANCEL_CONFIRMATION']
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uploadCanceled = current_app.config['DROPZONE_UPLOAD_CANCELED']
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timeout = current_app.config['DROPZONE_TIMEOUT']
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if timeout:
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timeout_js = 'timeout: %d,' % timeout
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else:
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timeout_js = ''
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if serve_local:
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js = '<script src="%s"></script>\n' % url_for('dropzone.static', filename=js_filename)
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css = '<link rel="stylesheet" href="%s" type="text/css">\n' % \
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url_for('dropzone.static', filename=css_filename)
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else:
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js = '<script src="https://cdn.jsdelivr.net/npm/dropzone@%s/dist/%s"></script>\n' % (version, js_filename)
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css = '<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/dropzone@%s/dist/min/%s"' \
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' type="text/css">\n' % (version, css_filename)
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if js_url:
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js = '<script src="%s"></script>\n' % js_url
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if css_url:
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css = '<link rel="stylesheet" href="%s" type="text/css">\n' % css_url
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return Markup('''
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%s%s<script>
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Dropzone.options.myDropzone = {
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init: function() {%s},
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uploadMultiple: %s,
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parallelUploads: %d,
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paramName: "%s", // The name that will be used to transfer the file
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maxFilesize: %d, // MB
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acceptedFiles: "%s",
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maxFiles: %s,
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dictDefaultMessage: "%s", // message display on drop area
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dictFallbackMessage: "%s",
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dictInvalidFileType: "%s",
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dictFileTooBig: "%s",
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dictResponseError: "%s",
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dictMaxFilesExceeded: "%s",
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dictCancelUpload: "%s",
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dictRemoveFile: "%s",
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dictCancelUploadConfirmation: "%s",
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dictUploadCanceled: "%s",
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%s // timeout
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};
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</script>
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''' % (css, js, redirect_js, upload_multiple, parallel_uploads, param, size, allowed_type, max_files,
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default_message, browser_unsupported, invalid_file_type, file_too_big, server_error,
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max_files_exceeded, cancelUpload, removeFile, cancelConfirmation, uploadCanceled, timeout_js))
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@staticmethod
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def load_css(css_url=None, version='5.2.0'):
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"""Load Dropzone's css resources with given version.
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.. versionadded:: 1.4.4
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:param css_url: The CSS url for Dropzone.js.
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:param version: The version of Dropzone.js.
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"""
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css_filename = 'dropzone.min.css'
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serve_local = current_app.config['DROPZONE_SERVE_LOCAL']
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if serve_local:
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css = '<link rel="stylesheet" href="%s" type="text/css">\n' % \
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url_for('dropzone.static', filename=css_filename)
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else:
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css = '<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/dropzone@%s/dist/min/%s"' \
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' type="text/css">\n' % (version, css_filename)
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if css_url:
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css = '<link rel="stylesheet" href="%s" type="text/css">\n' % css_url
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return Markup(css)
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@staticmethod
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def load_js(js_url=None, version='5.2.0'):
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"""Load Dropzone's js resources with given version.
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.. versionadded:: 1.4.4
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:param js_url: The JS url for Dropzone.js.
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:param version: The version of Dropzone.js.
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"""
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js_filename = 'dropzone.min.js'
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serve_local = current_app.config['DROPZONE_SERVE_LOCAL']
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if serve_local:
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js = '<script src="%s"></script>\n' % url_for('dropzone.static', filename=js_filename)
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else:
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js = '<script src="https://cdn.jsdelivr.net/npm/dropzone@%s/dist/%s"></script>\n' % (version, js_filename)
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if js_url:
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js = '<script src="%s"></script>\n' % js_url
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return Markup(js)
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@staticmethod
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def config(redirect_url=None, custom_init='', custom_options='', nonce=None, id=None, **kwargs):
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"""Initialize dropzone configuration.
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.. versionchanged:: 1.5.4
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Added ``id`` parameter.
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.. versionadded:: 1.4.4
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:param redirect_url: The URL to redirect when upload complete.
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:param custom_init: Custom javascript code in ``init: function() {}``.
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:param custom_options: Custom javascript code in ``Dropzone.options.myDropzone = {}``.
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:param nonce: Pass a nonce value that is newhen embedding the JavaScript code into a Content Security Policy protected web page.
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:param id: The id of the dropzone element, it must matches the ``id`` argument passed to
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``dropzone.create()`` if provided.
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:param **kwargs: Mirror configuration variable, lowercase and without prefix.
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For example, ``DROPZONE_UPLOAD_MULTIPLE`` becomes ``upload_multiple`` here.
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"""
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if custom_init and not custom_init.strip().endswith(';'):
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custom_init += ';'
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if custom_options and not custom_options.strip().endswith(','):
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custom_options += ','
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upload_multiple = kwargs.get('upload_multiple', current_app.config['DROPZONE_UPLOAD_MULTIPLE'])
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parallel_uploads = kwargs.get('parallel_uploads', current_app.config['DROPZONE_PARALLEL_UPLOADS'])
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if upload_multiple in [True, 'true', 'True', 1]:
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upload_multiple = 'true'
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else:
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upload_multiple = 'false'
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size = kwargs.get('max_file_size', current_app.config['DROPZONE_MAX_FILE_SIZE'])
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param = kwargs.get('input_name', current_app.config['DROPZONE_INPUT_NAME'])
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redirect_view = kwargs.get('redirect_view', current_app.config['DROPZONE_REDIRECT_VIEW'])
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if redirect_view is not None or redirect_url is not None:
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redirect_url = redirect_url or url_for(redirect_view)
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redirect_js = '''
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this.on("queuecomplete", function(file) {
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// Called when all files in the queue finish uploading.
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window.location = "%s";
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});''' % redirect_url
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else:
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redirect_js = ''
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max_files = kwargs.get('max_files', current_app.config['DROPZONE_MAX_FILES'])
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click_upload = kwargs.get('upload_on_click', current_app.config['DROPZONE_UPLOAD_ON_CLICK'])
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button_id = kwargs.get('upload_btn_id', current_app.config['DROPZONE_UPLOAD_BTN_ID'])
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in_form = kwargs.get('in_form', current_app.config['DROPZONE_IN_FORM'])
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cancelUpload = kwargs.get('cancel_upload', current_app.config['DROPZONE_CANCEL_UPLOAD'])
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removeFile = kwargs.get('remove_file', current_app.config['DROPZONE_REMOVE_FILE'])
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cancelConfirmation = kwargs.get('cancel_confirmation', current_app.config['DROPZONE_CANCEL_CONFIRMATION'])
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uploadCanceled = kwargs.get('upload_canceled', current_app.config['DROPZONE_UPLOAD_CANCELED'])
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if click_upload:
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if in_form:
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action = get_url(kwargs.get('upload_action', current_app.config['DROPZONE_UPLOAD_ACTION']))
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click_listener = '''
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dz = this; // Makes sure that 'this' is understood inside the functions below.
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document.getElementById("%s").addEventListener("click", function handler(e) {
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e.currentTarget.removeEventListener(e.type, handler);
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e.preventDefault();
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e.stopPropagation();
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dz.processQueue();
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});
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this.on("queuecomplete", function(file) {
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// Called when all files in the queue finish uploading.
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document.getElementById("%s").click();
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});
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''' % (button_id, button_id)
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click_option = '''
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url: "%s",
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autoProcessQueue: false,
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// addRemoveLinks: true,
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''' % action
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else:
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click_listener = '''
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dz = this;
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document.getElementById("%s").addEventListener("click", function handler(e) {dz.processQueue();});
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''' % button_id
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click_option = '''
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autoProcessQueue: false,
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// addRemoveLinks: true,
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'''
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upload_multiple = 'true'
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parallel_uploads = max_files if isinstance(max_files, int) else parallel_uploads
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else:
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click_listener = ''
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click_option = ''
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allowed_file_type = kwargs.get('allowed_file_type', current_app.config['DROPZONE_ALLOWED_FILE_TYPE'])
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allowed_file_custom = kwargs.get('allowed_file_custom', current_app.config['DROPZONE_ALLOWED_FILE_CUSTOM'])
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if allowed_file_custom:
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allowed_type = allowed_file_type
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else:
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allowed_type = allowed_file_extensions[allowed_file_type]
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default_message = kwargs.get('default_message', current_app.config['DROPZONE_DEFAULT_MESSAGE'])
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invalid_file_type = kwargs.get('invalid_file_type', current_app.config['DROPZONE_INVALID_FILE_TYPE'])
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file_too_big = kwargs.get('file_too_big', current_app.config['DROPZONE_FILE_TOO_BIG'])
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server_error = kwargs.get('server_error', current_app.config['DROPZONE_SERVER_ERROR'])
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browser_unsupported = kwargs.get('browser_unsupported', current_app.config['DROPZONE_BROWSER_UNSUPPORTED'])
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max_files_exceeded = kwargs.get('max_file_exceeded', current_app.config['DROPZONE_MAX_FILE_EXCEED'])
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timeout = kwargs.get('timeout', current_app.config['DROPZONE_TIMEOUT'])
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if timeout:
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custom_options += 'timeout: %d,' % timeout
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enable_csrf = kwargs.get('enable_csrf', current_app.config['DROPZONE_ENABLE_CSRF'])
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if enable_csrf:
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if 'csrf' not in current_app.extensions:
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raise RuntimeError("CSRFProtect is not initialized. It's required to enable CSRF protect, \
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see docs for more details.")
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csrf_token = render_template_string('{{ csrf_token() }}')
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custom_options += 'headers: {"X-CSRF-Token": "%s"},' % csrf_token
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nonce_html = ' nonce="%s"' % nonce if nonce else ''
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if id is None:
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id = 'myDropzone'
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return Markup('''<script%s>
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Dropzone.options.%s = {
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init: function() {
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%s // redirect after queue complete
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%s // upload queue when button click
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%s // custom init code
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},
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%s // click upload options
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uploadMultiple: %s,
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parallelUploads: %d,
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paramName: "%s", // The name that will be used to transfer the file
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maxFilesize: %d, // MB
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acceptedFiles: "%s",
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maxFiles: %s,
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dictDefaultMessage: `%s`, // message display on drop area
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dictFallbackMessage: "%s",
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dictInvalidFileType: "%s",
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dictFileTooBig: "%s",
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dictResponseError: "%s",
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dictMaxFilesExceeded: "%s",
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dictCancelUpload: "%s",
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dictRemoveFile: "%s",
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dictCancelUploadConfirmation: "%s",
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dictUploadCanceled: "%s",
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%s // custom options code
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};
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</script>
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''' % (nonce_html, id, redirect_js, click_listener, custom_init, click_option,
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upload_multiple, parallel_uploads, param, size, allowed_type, max_files,
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default_message, browser_unsupported, invalid_file_type, file_too_big,
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server_error, max_files_exceeded, cancelUpload, removeFile, cancelConfirmation,
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uploadCanceled, custom_options))
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@staticmethod
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def create(action='', csrf=False, action_view='', id=None, **kwargs):
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"""Create a Dropzone form with given action.
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.. versionchanged:: 1.4.2
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Added ``csrf`` parameter to enable CSRF protect.
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.. versionchanged:: 1.4.3
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Added ``action`` parameter to replace ``action_view``, ``action_view`` was deprecated now.
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.. versionchanged:: 1.5.0
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If ``DROPZONE_IN_FORM`` set to ``True``, create ``<div>`` instead of ``<form>``.
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.. versionchanged:: 1.5.4
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``csrf`` was deprecated now.
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.. versionchanged:: 1.5.4
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Added ``id`` parameter.
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:param action: The action attribute in ``<form>``, pass the url which handle uploads.
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:param csrf: Enable CSRF protect or not, same with ``DROPZONE_ENABLE_CSRF``, deprecated since 1.5.4.
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:param action_view: The view which handle the post data, deprecated since 1.4.2.
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:param id: The id of the dropzone element, it must matches the ``id`` argument passed to
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``dropzone.config()`` if provided.
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"""
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if current_app.config['DROPZONE_IN_FORM']:
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return Markup('<div class="dropzone" id="myDropzone"></div>')
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if action:
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action_url = get_url(action, **kwargs)
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else:
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warnings.warn('The argument was renamed to "action" and will be removed in 2.0.')
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action_url = url_for(action_view, **kwargs)
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if csrf:
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warnings.warn('The argument was deprecated and will be removed in 2.0, use DROPZONE_ENABLE_CSRF instead.')
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if id is None:
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id = 'myDropzone'
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return Markup('''<form action="%s" method="post" class="dropzone" id="%s"
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enctype="multipart/form-data"></form>''' % (action_url, id))
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@staticmethod
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def style(css):
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"""Add css to dropzone.
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:param css: style sheet code.
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"""
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return Markup('<style>\n.dropzone{%s}\n</style>' % css)
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class Dropzone(object):
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def __init__(self, app=None):
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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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blueprint = Blueprint('dropzone', __name__,
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static_folder='static',
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static_url_path='/dropzone' + app.static_url_path)
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app.register_blueprint(blueprint)
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if not hasattr(app, 'extensions'):
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app.extensions = {}
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app.extensions['dropzone'] = _Dropzone
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app.context_processor(self.context_processor)
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# settings
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app.config.setdefault('DROPZONE_SERVE_LOCAL', False)
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app.config.setdefault('DROPZONE_MAX_FILE_SIZE', 3) # MB
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app.config.setdefault('DROPZONE_INPUT_NAME', 'file')
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app.config.setdefault('DROPZONE_ALLOWED_FILE_CUSTOM', False)
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app.config.setdefault('DROPZONE_ALLOWED_FILE_TYPE', 'default')
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app.config.setdefault('DROPZONE_MAX_FILES', 'null')
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# The timeout to cancel upload request in millisecond, default to 30000 (30 second).
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# Set a large number if you need to upload large file.
|
||||
# .. versionadded: 1.5.0
|
||||
app.config.setdefault('DROPZONE_TIMEOUT', None) # millisecond, default to 30000 (30 second)
|
||||
|
||||
# The view to redirect when upload was completed.
|
||||
# .. versionadded:: 1.4.1
|
||||
app.config.setdefault('DROPZONE_REDIRECT_VIEW', None)
|
||||
|
||||
# Whether to send multiple files in one request.
|
||||
# In default, each file will send with a request.
|
||||
# Then you can use ``request.files.getlist('paramName')`` to
|
||||
# get a list of uploads.
|
||||
# .. versionadded:: 1.4.1
|
||||
app.config.setdefault('DROPZONE_UPLOAD_MULTIPLE', False)
|
||||
|
||||
# When ``DROPZONE_UPLOAD_MULTIPLE`` set to True, this will
|
||||
# defined how many uploads will handled in per request.
|
||||
# .. versionadded:: 1.4.1
|
||||
app.config.setdefault('DROPZONE_PARALLEL_UPLOADS', 2)
|
||||
|
||||
# When set to ``True``, it will add a csrf_token hidden field in upload form.
|
||||
# You have to install Flask-WTF to make it work properly, see details in docs.
|
||||
# .. versionadded:: 1.4.2
|
||||
app.config.setdefault('DROPZONE_ENABLE_CSRF', False)
|
||||
|
||||
# Add support to upload files when button was clicked.
|
||||
# .. versionadded:: 1.5.0
|
||||
app.config.setdefault('DROPZONE_UPLOAD_ACTION', '')
|
||||
app.config.setdefault('DROPZONE_UPLOAD_ON_CLICK', False)
|
||||
app.config.setdefault('DROPZONE_UPLOAD_BTN_ID', 'upload')
|
||||
|
||||
# Add support to create dropzone inside ``<form>``.
|
||||
# .. versionadded:: 1.5.0
|
||||
app.config.setdefault('DROPZONE_IN_FORM', False)
|
||||
|
||||
# messages
|
||||
app.config.setdefault('DROPZONE_DEFAULT_MESSAGE', "Drop files here or click to upload.")
|
||||
app.config.setdefault('DROPZONE_INVALID_FILE_TYPE', "You can't upload files of this type.")
|
||||
app.config.setdefault('DROPZONE_FILE_TOO_BIG',
|
||||
"File is too big {{filesize}}. Max filesize: {{maxFilesize}}MiB.")
|
||||
app.config.setdefault('DROPZONE_SERVER_ERROR', "Server error: {{statusCode}}")
|
||||
app.config.setdefault('DROPZONE_BROWSER_UNSUPPORTED',
|
||||
"Your browser does not support drag'n'drop file uploads.")
|
||||
app.config.setdefault('DROPZONE_MAX_FILE_EXCEED', "You can't upload any more files.")
|
||||
app.config.setdefault('DROPZONE_CANCEL_UPLOAD', "Cancel upload")
|
||||
app.config.setdefault('DROPZONE_REMOVE_FILE', "Remove file")
|
||||
app.config.setdefault('DROPZONE_CANCEL_CONFIRMATION', "You really want to delete this file?")
|
||||
app.config.setdefault('DROPZONE_UPLOAD_CANCELED', "Upload canceled")
|
||||
|
||||
@staticmethod
|
||||
def context_processor():
|
||||
return {
|
||||
'dropzone': current_app.extensions['dropzone']
|
||||
}
|
||||
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|
||||
"""
|
||||
flask_dropzone.utils
|
||||
~~~~~~~~~~~~~~~~~~~~~
|
||||
|
||||
:author: Grey Li <withlihui@gmail.com>
|
||||
:copyright: (c) 2017 by Grey Li.
|
||||
:license: MIT, see LICENSE for more details.
|
||||
"""
|
||||
import os
|
||||
import uuid
|
||||
|
||||
from flask import url_for
|
||||
|
||||
|
||||
def get_url(endpoint_or_url, **kwargs):
|
||||
if endpoint_or_url == '':
|
||||
return
|
||||
if endpoint_or_url.startswith(('https://', 'http://', '/')):
|
||||
return endpoint_or_url
|
||||
else:
|
||||
return url_for(endpoint_or_url, **kwargs)
|
||||
|
||||
|
||||
#: generate a random filename, replacement for werkzeug.secure_filename
|
||||
def random_filename(old_filename):
|
||||
ext = os.path.splitext(old_filename)[1]
|
||||
new_filename = uuid.uuid4().hex + ext
|
||||
return new_filename
|
||||
Reference in New Issue
Block a user