a428c73a90
* Use later updated library code (fixes bug) from existing vendored dependency * Update attributions.md * Simplify usage in get_gravatar
83 lines
2.4 KiB
Python
83 lines
2.4 KiB
Python
"""
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This module provides a class Identicon that can be used to generate identicons
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from strings.
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It provides a (slighltly modified) version of https://github.com/evuez/identicons
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which has been released under the MIT license, as described in attributions.md.
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"""
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from base64 import b64encode
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from hashlib import md5
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from io import BytesIO
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from PIL import Image, ImageDraw
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GRID_SIZE = 5
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BORDER_SIZE = 20
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SQUARE_SIZE = 40
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class Identicon:
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def __init__(self, str_, background="#fafbfc"):
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"""
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`str_` is the string used to generate the identicon.
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`background` is the background of the identicon.
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"""
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w = h = BORDER_SIZE * 2 + SQUARE_SIZE * GRID_SIZE
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self.image = Image.new("RGB", (w, h), background)
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self.draw = ImageDraw.Draw(self.image)
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self.hash = self.digest(str_)
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def digest(self, str_):
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"""
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Returns a md5 numeric hash
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"""
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return int(md5(str_.encode("utf-8")).hexdigest(), 16)
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def calculate(self):
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"""
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Creates the identicon.
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First three bytes are used to generate the color,
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remaining bytes are used to create the drawing
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"""
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color = (self.hash & 0xFF, self.hash >> 8 & 0xFF, self.hash >> 16 & 0xFF)
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self.hash >>= 24 # skip first three bytes
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square_x = square_y = 0 # init square position
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for x in range(GRID_SIZE * (GRID_SIZE + 1) // 2):
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if self.hash & 1:
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x = BORDER_SIZE + square_x * SQUARE_SIZE
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y = BORDER_SIZE + square_y * SQUARE_SIZE
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self.draw.rectangle((x, y, x + SQUARE_SIZE, y + SQUARE_SIZE), fill=color, outline=color)
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# following is just for mirroring
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x = BORDER_SIZE + (GRID_SIZE - 1 - square_x) * SQUARE_SIZE
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self.draw.rectangle((x, y, x + SQUARE_SIZE, y + SQUARE_SIZE), fill=color, outline=color)
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self.hash >>= 1 # shift to right
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square_y += 1
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if square_y == GRID_SIZE: # done with first column
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square_y = 0
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square_x += 1
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def generate(self):
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"""
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Save and show calculated identicon
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"""
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self.calculate()
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with open("identicon.png", "wb") as out:
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self.image.save(out, "PNG")
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self.image.show()
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def base64(self, format="PNG"):
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"""
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Return the identicon's base64
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Created by: liuzheng712
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Bug report: https://github.com/liuzheng712/identicons/issues
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"""
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self.calculate()
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self.image.encoderinfo = {}
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self.image.encoderconfig = ()
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buff = BytesIO()
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self.image.save(buff, format=format.upper())
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return f"data:image/png;base64,{b64encode(buff.getvalue()).decode()}"
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