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255 lines
9.5 KiB
Python
255 lines
9.5 KiB
Python
"""UItility functions facilitate making unit testing easier and less brittle."""
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import email
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import factory
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import faker
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import random
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import re
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import string
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import typing
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import unicodedata
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from email import encoders
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from email.message import Message
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from email.mime.base import MIMEBase
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from email.mime.image import MIMEImage
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from email.mime.text import MIMEText
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from io import BytesIO
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from numpy.random import randint
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from PIL import Image
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from typing import Tuple, Any, Optional
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from email.mime.multipart import MIMEMultipart
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def strip_accents(text):
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"""
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Strip accents from input String. (only works on Pythin 3
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:param text: The input string.
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:type text: String.
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:returns: The processed String.
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:rtype: String.
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"""
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text = unicodedata.normalize('NFD', text)
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text = text.encode('ascii', 'ignore')
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text = text.decode("utf-8")
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return str(text)
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def text_to_id(text):
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"""
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Convert input text to id.
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:param text: The input string.
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:type text: String.
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:returns: The processed String.
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:rtype: String.
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"""
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text = strip_accents(text.lower())
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text = re.sub('[ ]+', '_', text)
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text = re.sub('[^0-9a-zA-Z_-]', '', text)
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return text
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def get_random_string(length: int=16) -> str:
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return "".join(
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[random.choice(string.ascii_letters + string.digits) for _ in range(length)]
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)
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def generate_random_image(image_format, array_dims):
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"""
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Creates an image from a random array.
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:param image_format: An image format (PNG or JPEG).
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:param array_dims: A tuple with array dimensions.
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:returns: A byte string with encoded image
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:rtype: bytes
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"""
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image_bytes = randint(low=0, high=255, size=array_dims, dtype='uint8')
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io = BytesIO()
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image_pil = Image.fromarray(image_bytes)
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image_pil.save(io, image_format, subsampling=0, quality=100)
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return io.getvalue()
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def get_random_image(image_format: str="PNG", size: int=5):
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"""
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Returns a random image.
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Args:
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image_format: An image format (PNG or JPEG).
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Returns:
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A string with encoded image
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"""
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return generate_random_image(image_format, (size, size, 3))
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def get_fake(provider: str, locale: str = "en_US", min_length: int = 5) -> Any:
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"""
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Generates a random string, float, integer etc based on provider
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Provider can be "text', 'sentence', "word"
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e.g. `get_fake('name')` ==> 'Buzz Aldrin'
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"""
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string = factory.Faker(provider).evaluate({}, None, {'locale': locale,})
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while len(string) < min_length:
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string += factory.Faker(provider).evaluate({}, None, {'locale': locale,})
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return string
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def get_fake_html(locale: str = "en_US", wrap_in_body_tag=True) -> Any:
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"""
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Generates a random string, float, integer etc based on provider
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Provider can be "text', 'sentence',
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e.g. `get_fake('name')` ==> 'Buzz Aldrin'
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"""
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html = factory.Faker("sentence").evaluate({}, None, {'locale': locale,})
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for _ in range(0,4):
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html += "<li>" + factory.Faker("sentence").evaluate({}, None, {'locale': locale,}) + "</li>"
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for _ in range(0,4):
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html += "<p>" + factory.Faker("text").evaluate({}, None, {'locale': locale,})
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return f"<body>{html}</body>" if wrap_in_body_tag else html
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def generate_email_address(
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locale: str="en_US",
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use_short_email: bool=False,
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real_name_format: Optional[str]="{last_name}, {first_name}",
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last_name_override: Optional[str]=None) -> Tuple[str, str, str, str]:
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'''
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Generate an RFC 2822 email address
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:param locale: change this to generate locale specific names
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:param use_short_email: defaults to false. If true then does not include real name in email address
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:param real_name_format: pass a different format if different than "{last_name}, {first_name}"
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:param last_name_override: override the fake name if you want some special characters in the last name
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:returns <RFC2822 formatted email for header>, <short email address>, <first name>, <last_name
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'''
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fake = faker.Faker(locale=locale)
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first_name = fake.first_name()
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last_name = last_name_override or fake.last_name()
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real_name = None if use_short_email else real_name_format.format(first_name=first_name, last_name=last_name)
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# Add a random string to ensure we do not generate a real domain name
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email_address = "{}.{}@{}".format(
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first_name.replace(' ', '').encode("ascii", "ignore").lower().decode(),
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last_name.replace(' ', '').encode("ascii", "ignore").lower().decode(),
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get_random_string(5) + fake.domain_name()
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)
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# format email address for RFC 2822 and return
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return email.utils.formataddr((real_name, email_address)), email_address, first_name, last_name
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def generate_file_mime_part(locale: str="en_US",filename: str = None) -> Message:
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"""
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:param locale: change this to generate locale specific file name and attachment content
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:param filename: pass a file name if you want t ospecify a specific name otherwise a random name will be generated
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"""
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part = MIMEBase('application', 'octet-stream')
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part.set_payload(get_fake("text", locale=locale, min_length=1024))
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encoders.encode_base64(part)
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if not filename:
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filename = get_fake("word", locale=locale, min_length=8) + ".txt"
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part.add_header('Content-Disposition', "attachment; filename= %s" % filename)
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return part
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def generate_image_mime_part(locale: str="en_US",imagename: str = None) -> Message:
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"""
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:param locale: change this to generate locale specific file name and attachment content
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:param filename: pass a file name if you want t ospecify a specific name otherwise a random name will be generated
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"""
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part = MIMEImage(generate_random_image(image_format="JPEG"))
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part.set_payload(get_fake("text", locale=locale, min_length=1024))
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encoders.encode_base64(part)
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if not imagename:
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imagename = get_fake("word", locale=locale, min_length=8) + ".jpg"
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part.add_header('Content-Disposition', "attachment; filename= %s" % imagename)
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return part
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def add_email_headers(message: Message, locale: str="en_US",
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use_short_email: bool=False
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) -> typing.Tuple[typing.Tuple[str, str], typing.Tuple[str, str]]:
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"""
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Adds the key email headers to a Mime part
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:param message: the Mime part to add headers to
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:param locale: change this to generate locale specific "real names" and subject
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:param use_short_email: produces a "To" or "From" that is only the email address if True
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"""
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to_meta = generate_email_address(locale, use_short_email=use_short_email)
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from_meta = generate_email_address(locale, use_short_email=use_short_email)
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message['Subject'] = get_fake("sentence", locale=locale)
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message['From'] = from_meta[0]
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message['To'] = to_meta[0]
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return from_meta, to_meta
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def generate_mime_part(locale: str="en_US",
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part_type: str="plain",
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use_short_email: bool=False
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) -> typing.Tuple[Message, typing.Tuple[str, str], typing.Tuple[str, str]]:
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"""
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Generates amime part of the sepecified type
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:param locale: change this to generate locale specific strings
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:param text_type: options are plain, html, image (attachment), file (attachment)
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:param use_short_email: produces a "To" or "From" that is only the email address if True
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"""
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if "plain" == part_type:
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body = get_fake("text", locale=locale, min_length=1024)
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msg = MIMEText(body)
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elif "html" == part_type:
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body = get_fake_html(locale=locale, wrap_in_body_tag=True)
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msg = MIMEText(body)
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elif "file" == part_type:
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msg = generate_file_mime_part(locale=locale)
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msg = MIMEText(body)
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elif "image" == part_type:
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msg = generate_image_mime_part(locale=locale)
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msg = MIMEText(body)
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else:
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raise Exception("Mime part not implemented: " + part_type)
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return msg
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def generate_multipart_email(locale: str="en_US",
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type_list: typing.List[str]=["plain", "html", "attachment"],
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use_short_email: bool=False
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) -> typing.Tuple[Message, typing.Tuple[str, str], typing.Tuple[str, str]]:
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"""
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Generates an email including headers with the defined multiparts
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:param locale:
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:param type_list: options are plain, html, image (attachment), file (attachment)
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:param use_short_email: produces a "To" or "From" that is only the email address if True
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"""
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msg = MIMEMultipart()
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for part_type in type_list:
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msg.append(generate_mime_part(locale=locale, part_type=part_type, use_short_email=use_short_email))
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from_meta, to_meta = add_email_headers(msg, locale=locale, use_short_email=use_short_email)
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return msg, from_meta, to_meta
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def generate_text_email(locale: str="en_US",
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use_short_email: bool=False
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) -> typing.Tuple[Message, typing.Tuple[str, str], typing.Tuple[str, str]]:
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"""
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Generates an email including headers
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"""
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body = get_fake("text", locale=locale, min_length=1024)
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msg = MIMEText(body)
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from_meta, to_meta = add_email_headers(msg, locale=locale, use_short_email=use_short_email)
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return msg, from_meta, to_meta
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def generate_html_email(locale: str="en_US",
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use_short_email: bool=False
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) -> typing.Tuple[Message, typing.Tuple[str, str], typing.Tuple[str, str]]:
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"""
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Generates an email including headers
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"""
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body = get_fake_html(locale=locale)
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msg = MIMEText(body)
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from_meta, to_meta = add_email_headers(msg, locale=locale, use_short_email=use_short_email)
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return msg, from_meta, to_meta
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