2017-09-16 14:30:57 +02:00
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#!/usr/bin/env python3
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import os
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2020-06-11 00:54:34 +02:00
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from typing import Set
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2017-09-16 14:30:57 +02:00
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from cssutils import profile
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2020-06-11 00:54:34 +02:00
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from cssutils.profiles import Profiles, macros, properties
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from premailer import Premailer
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2017-09-16 14:30:57 +02:00
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2019-11-16 02:38:42 +01:00
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ZULIP_PATH = os.path.join(os.path.dirname(os.path.abspath(__file__)), '../../')
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2020-04-09 12:22:23 +02:00
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EMAIL_TEMPLATES_PATH = os.path.join(ZULIP_PATH, 'templates', 'zerver', 'emails')
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COMPILED_EMAIL_TEMPLATES_PATH = os.path.join(EMAIL_TEMPLATES_PATH, 'compiled')
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CSS_SOURCE_PATH = os.path.join(EMAIL_TEMPLATES_PATH, "email.css")
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2017-09-16 14:30:57 +02:00
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2020-04-06 02:48:43 +02:00
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def configure_cssutils() -> None:
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2017-09-16 14:30:57 +02:00
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# These properties are not supported by cssutils by default and will
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# result in warnings when premailer package is run.
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properties[Profiles.CSS_LEVEL_2]['-ms-interpolation-mode'] = r'none|bicubic|nearest-neighbor'
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properties[Profiles.CSS_LEVEL_2]['-ms-text-size-adjust'] = r'none|auto|{percentage}'
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properties[Profiles.CSS_LEVEL_2]['mso-table-lspace'] = r'0|{num}(pt)'
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properties[Profiles.CSS_LEVEL_2]['mso-table-rspace'] = r'0|{num}(pt)'
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properties[Profiles.CSS_LEVEL_2]['-webkit-text-size-adjust'] = r'none|auto|{percentage}'
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properties[Profiles.CSS_LEVEL_2]['mso-hide'] = 'all'
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2017-11-08 03:47:28 +01:00
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properties[Profiles.CSS_LEVEL_2]['pointer-events'] = (r'auto|none|visiblePainted|'
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r'visibleFill|visibleStroke|'
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2017-09-16 14:30:57 +02:00
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r'visible|painted|fill|stroke|all|inherit')
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2017-11-10 04:33:28 +01:00
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profile.addProfiles([(Profiles.CSS_LEVEL_2, properties[Profiles.CSS_LEVEL_2],
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2020-04-22 01:45:30 +02:00
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macros[Profiles.CSS_LEVEL_2])])
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2020-04-11 00:49:28 +02:00
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configure_cssutils()
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2017-09-16 14:30:57 +02:00
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2020-04-11 00:52:52 +02:00
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def inline_template(template_source_name: str) -> None:
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template_name = template_source_name.split('.source.html')[0]
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template_path = os.path.join(EMAIL_TEMPLATES_PATH, template_source_name)
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2020-04-22 01:48:28 +02:00
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compiled_template_path = os.path.join(os.path.dirname(template_path), "compiled",
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os.path.basename(template_name) + ".html")
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os.makedirs(os.path.dirname(compiled_template_path), exist_ok=True)
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2020-04-09 12:39:01 +02:00
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with open(template_path) as template_source_file:
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template_str = template_source_file.read()
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output = Premailer(template_str,
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external_styles=[CSS_SOURCE_PATH]).transform()
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output = escape_jinja2_characters(output)
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# Premailer.transform will try to complete the DOM tree,
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# adding html, head, and body tags if they aren't there.
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# While this is correct for the email_base_default template,
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# it is wrong for the other templates that extend this
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# template, since we'll end up with 2 copipes of those tags.
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# Thus, we strip this stuff out if the template extends
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# another template.
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2020-10-23 15:30:13 +02:00
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if template_name not in ['email_base_default', 'macros']:
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2020-04-09 12:39:01 +02:00
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output = strip_unnecesary_tags(output)
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if ('zerver/emails/compiled/email_base_default.html' in output or
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'zerver/emails/email_base_messages.html' in output):
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assert output.count('<html>') == 0
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assert output.count('<body>') == 0
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assert output.count('</html>') == 0
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assert output.count('</body>') == 0
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with open(compiled_template_path, 'w') as final_template_file:
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final_template_file.write(output)
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2020-04-09 12:12:09 +02:00
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def escape_jinja2_characters(text: str) -> str:
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2020-04-06 02:48:43 +02:00
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escaped_jinja2_characters = [('%7B%7B%20', '{{ '), ('%20%7D%7D', ' }}'), ('>', '>')]
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2020-04-09 12:12:09 +02:00
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for escaped, original in escaped_jinja2_characters:
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text = text.replace(escaped, original)
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return text
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2020-04-06 02:48:43 +02:00
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2020-04-09 12:16:53 +02:00
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def strip_unnecesary_tags(text: str) -> str:
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end_block = '</body>\n</html>'
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start_block = '{% extends'
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start = text.find(start_block)
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end = text.rfind(end_block)
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if start != -1 and end != -1:
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text = text[start:end]
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return text
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else:
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2020-06-10 06:41:04 +02:00
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raise ValueError(f"Template does not have {start_block} or {end_block}")
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2020-04-09 12:16:53 +02:00
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2020-04-09 12:27:24 +02:00
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def get_all_templates_from_directory(directory: str) -> Set[str]:
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result = set()
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for f in os.listdir(directory):
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2020-04-06 02:48:43 +02:00
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if f.endswith('.source.html'):
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2020-04-11 00:52:52 +02:00
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result.add(f)
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2020-04-09 12:27:24 +02:00
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return result
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2020-04-06 02:48:43 +02:00
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2020-04-09 12:27:24 +02:00
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if __name__ == "__main__":
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templates_to_inline = get_all_templates_from_directory(EMAIL_TEMPLATES_PATH)
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2020-04-06 02:48:43 +02:00
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2020-04-11 00:52:52 +02:00
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for template_source_name in templates_to_inline:
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inline_template(template_source_name)
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