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#!/usr/bin/env python
# Copyright 2013 Google Inc. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Inject javascript into html page source code."""
import logging
import os
import re
import util
DOCTYPE_RE = re.compile(r'^.{,256}?(<!--.*-->)?.{,256}?<!doctype html>',
re.IGNORECASE | re.DOTALL)
HTML_RE = re.compile(r'^.{,256}?(<!--.*-->)?.{,256}?<html.*?>',
re.IGNORECASE | re.DOTALL)
HEAD_RE = re.compile(r'^.{,256}?(<!--.*-->)?.{,256}?<head.*?>',
re.IGNORECASE | re.DOTALL)
def GetInjectScript(scripts):
"""Loads |scripts| from disk and returns a string of their content."""
lines = []
if scripts:
if not isinstance(scripts, list):
scripts = scripts.split(',')
for script in scripts:
if os.path.exists(script):
with open(script) as f:
lines.extend(f.read())
elif util.resource_exists(script):
lines.extend(util.resource_string(script))
else:
raise Exception('Script does not exist: %s', script)
def MinifyScript(script):
"""Remove C-style comments and line breaks from script.
Note: statements must be ';' terminated, and not depending on newline"""
# Regex adapted from http://ostermiller.org/findcomment.html.
MULTILINE_COMMENT_RE = re.compile(r'/\*.*?\*/', re.DOTALL | re.MULTILINE)
SINGLELINE_COMMENT_RE = re.compile(r'//.*', re.MULTILINE)
# Remove C-style comments from JS.
script = re.sub(MULTILINE_COMMENT_RE, '', script)
script = re.sub(SINGLELINE_COMMENT_RE, '', script)
# Remove line breaks.
script = script.translate(None, '\r\n')
return script
return MinifyScript(''.join(lines))
def InjectScript(content, content_type, script_to_inject):
"""Inject |script_to_inject| into |content| if |content_type| is 'text/html'.
Inject |script_to_inject| into |content| immediately after <head>, <html> or
<!doctype html>, if one of them is found. Otherwise, inject at the beginning.
Returns:
content, already_injected
|content| is the new content if script is injected, otherwise the original.
|already_injected| indicates if |script_to_inject| is already in |content|.
"""
already_injected = False
if content_type and content_type == 'text/html':
already_injected = not content or script_to_inject in content
if not already_injected:
def InsertScriptAfter(matchobj):
return '%s<script>%s</script>' % (matchobj.group(0), script_to_inject)
content, is_injected = HEAD_RE.subn(InsertScriptAfter, content, 1)
if not is_injected:
content, is_injected = HTML_RE.subn(InsertScriptAfter, content, 1)
if not is_injected:
content, is_injected = DOCTYPE_RE.subn(InsertScriptAfter, content, 1)
if not is_injected:
content = '<script>%s</script>%s' % (script_to_inject, content)
logging.warning('Inject at the very beginning, because no tag of '
'<head>, <html> or <!doctype html> is found.')
return content, already_injected
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