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# -*- coding: utf-8 -*-
"""
(C) 2014-2019 Roman Sirokov and contributors
Licensed under BSD license
http://github.com/r0x0r/pywebview/
"""
import inspect
import json
import logging
import os
import re
import sys
import traceback
from platform import architecture
from threading import Thread
from uuid import uuid4
import webview
from .js import api, npo, dom, event, drag
_token = uuid4().hex
default_html = """
<!doctype html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1.0, user-scalable=0">
</head>
<body></body>
</html>
"""
logger = logging.getLogger('pywebview')
class WebViewException(Exception):
pass
def get_app_root():
"""
Gets the file root of the application.
"""
try:
# PyInstaller creates a temp folder and stores path in _MEIPASS
return sys._MEIPASS
except AttributeError:
if 'pytest' in sys.modules:
for arg in reversed(sys.argv):
path = os.path.realpath(arg.split('::')[0])
if os.path.exists(path):
return path if os.path.isdir(path) else os.path.dirname(path)
else:
return os.path.dirname(os.path.realpath(sys.argv[0]))
def abspath(path):
"""
Make path absolute, using the application root
"""
path = os.fspath(path)
if not os.path.isabs(path):
path = os.path.join(get_app_root(), path)
return os.path.normpath(path)
def base_uri(relative_path=''):
""" Get absolute path to resource, works for dev and for PyInstaller """
base_path = get_app_root()
if not os.path.exists(base_path):
raise ValueError('Path %s does not exist' % base_path)
return 'file://%s' % os.path.join(base_path, relative_path)
def convert_string(string):
if sys.version < '3':
return unicode(string)
else:
return str(string)
def parse_file_type(file_type):
'''
:param file_type: file type string 'description (*.file_extension1;*.file_extension2)' as required by file filter in create_file_dialog
:return: (description, file extensions) tuple
'''
valid_file_filter = r'^([\w ]+)\((\*(?:\.(?:\w+|\*))*(?:;\*\.\w+)*)\)$'
match = re.search(valid_file_filter, file_type)
if match:
return match.group(1).rstrip(), match.group(2)
else:
raise ValueError('{0} is not a valid file filter'.format(file_type))
def parse_api_js(window, platform, uid=''):
def get_args(f):
try:
params = list(inspect.getfullargspec(f).args) # Python 3
except AttributeError:
params = list(inspect.getargspec(f).args) # Python 2
return params
def generate_func():
if window._js_api:
functions = { name: get_args(getattr(window._js_api, name))[1:] for name in dir(window._js_api) if callable(getattr(window._js_api, name)) and not name.startswith('_')}
else:
functions = {}
if len(window._functions) > 0:
expose_functions = { name: get_args(f) for name, f in window._functions.items()}
else:
expose_functions = {}
functions.update(expose_functions)
functions = functions.items()
return [ {'func': name, 'params': params} for name, params in functions ]
try:
func_list = generate_func()
except Exception as e:
logger.exception(e)
js_code = npo.src + event.src + api.src % (_token, platform, uid, func_list) + dom.src + drag.src % webview.DRAG_REGION_SELECTOR
return js_code
def js_bridge_call(window, func_name, param, value_id):
def _call():
try:
result = func(*func_params.values())
result = json.dumps(result).replace('\\', '\\\\').replace('\'', '\\\'')
code = 'window.pywebview._returnValues["{0}"]["{1}"] = {{value: \'{2}\'}}'.format(func_name, value_id, result)
except Exception as e:
error = {
'message': str(e),
'name': type(e).__name__,
'stack': traceback.format_exc()
}
result = json.dumps(error).replace('\\', '\\\\').replace('\'', '\\\'')
code = 'window.pywebview._returnValues["{0}"]["{1}"] = {{isError: true, value: \'{2}\'}}'.format(func_name, value_id, result)
window.evaluate_js(code)
if func_name == 'moveWindow':
window.move(*param)
return
func = window._functions.get(func_name) or getattr(window._js_api, func_name, None)
if func is not None:
try:
func_params = param if not param else json.loads(param)
t = Thread(target=_call)
t.start()
except Exception:
logger.exception('Error occurred while evaluating function {0}'.format(func_name))
else:
logger.error('Function {}() does not exist'.format(func_name))
def escape_string(string):
return string\
.replace('\\', '\\\\') \
.replace('"', r'\"') \
.replace('\n', r'\n')\
.replace('\r', r'\r')
def make_unicode(string):
"""
Python 2 and 3 compatibility function that converts a string to Unicode. In case of Unicode, the string is returned
unchanged
:param string: input string
:return: Unicode string
"""
if sys.version < '3' and isinstance(string, str):
return unicode(string.decode('utf-8'))
return string
def escape_line_breaks(string):
return string.replace('\\n', '\\\\n').replace('\\r', '\\\\r')
def inject_base_uri(content, base_uri):
pattern = r'<%s(?:[\s]+[^>]*|)>'
base_tag = '<base href="%s">' % base_uri
match = re.search(pattern % 'base', content)
if match:
return content
match = re.search(pattern % 'head', content)
if match:
tag = match.group()
return content.replace(tag, tag + base_tag)
match = re.search(pattern % 'html', content)
if match:
tag = match.group()
return content.replace(tag, tag + base_tag)
match = re.search(pattern % 'body', content)
if match:
tag = match.group()
return content.replace(tag, base_tag + tag)
return base_tag + content
def interop_dll_path(dll_name):
if dll_name == 'WebBrowserInterop.dll':
dll_name = 'WebBrowserInterop.x64.dll' if architecture()[0] == '64bit' else 'WebBrowserInterop.x86.dll'
# Unfrozen path
dll_path = os.path.join(os.path.dirname(os.path.realpath(__file__)), 'lib', dll_name)
if os.path.exists(dll_path):
return dll_path
# Frozen path, dll in the same dir as the executable
dll_path = os.path.join(os.path.dirname(os.path.realpath(sys.argv[0])), dll_name)
if os.path.exists(dll_path):
return dll_path
try:
# Frozen path packed as onefile
dll_path = os.path.join(sys._MEIPASS, dll_name)
if os.path.exists(dll_path):
return dll_path
except Exception:
pass
raise Exception('Cannot find %s' % dll_name)
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