# Copyright (c) 2016-2023 Martin Donath # Permission is hereby granted, free of charge, to any person obtaining a copy # of this software and associated documentation files (the "Software"), to # deal in the Software without restriction, including without limitation the # rights to use, copy, modify, merge, publish, distribute, sublicense, and/or # sell copies of the Software, and to permit persons to whom the Software is # furnished to do so, subject to the following conditions: # The above copyright notice and this permission notice shall be included in # all copies or substantial portions of the Software. # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, # FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING # FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS # IN THE SOFTWARE. import concurrent.futures import functools import logging import os import posixpath import re import requests import sys from collections import defaultdict from hashlib import md5 from io import BytesIO from mkdocs.commands.build import DuplicateFilter from mkdocs.config import config_options as opt from mkdocs.config.base import Config from mkdocs.plugins import BasePlugin from shutil import copyfile from tempfile import TemporaryFile from zipfile import ZipFile try: from cairosvg import svg2png from PIL import Image, ImageDraw, ImageFont dependencies = True except ImportError: dependencies = False # ----------------------------------------------------------------------------- # Class # ----------------------------------------------------------------------------- # Social plugin configuration scheme class SocialPluginConfig(Config): enabled = opt.Type(bool, default = True) cache_dir = opt.Type(str, default = ".cache/plugin/social") # Options for social cards cards = opt.Type(bool, default = True) cards_dir = opt.Type(str, default = "assets/images/social") cards_color = opt.Type(dict, default = dict()) cards_font = opt.Optional(opt.Type(str)) # ----------------------------------------------------------------------------- # Social plugin class SocialPlugin(BasePlugin[SocialPluginConfig]): def __init__(self): self._executor = concurrent.futures.ThreadPoolExecutor(4) # Retrieve configuration def on_config(self, config): self.color = colors.get("indigo") if not self.config.cards: return # Check if required dependencies are installed if not dependencies: log.error( "Required dependencies of \"social\" plugin not found. " "Install with: pip install pillow cairosvg" ) sys.exit(1) # Check if site URL is defined if not config.site_url: log.warning( "The \"social\" plugin needs the \"site_url\" configuration " "option to be defined. It will likely not work correctly." ) # Ensure presence of cache directory self.cache = self.config.cache_dir if not os.path.isdir(self.cache): os.makedirs(self.cache) # Retrieve palette from theme configuration theme = config.theme if "palette" in theme: palette = theme["palette"] # Use first palette, if multiple are defined if isinstance(palette, list): palette = palette[0] # Set colors according to palette if "primary" in palette and palette["primary"]: primary = palette["primary"].replace(" ", "-") self.color = colors.get(primary, self.color) # Retrieve color overrides self.color = { **self.color, **self.config.cards_color } # Retrieve logo and font self._resized_logo_promise = self._executor.submit(self._load_resized_logo, config) self.font = self._load_font(config) self._image_promises = [] # Create social cards def on_page_markdown(self, markdown, page, config, files): if not self.config.cards: return # Resolve image directory directory = self.config.cards_dir file, _ = os.path.splitext(page.file.src_path) # Resolve path of image path = "{}.png".format(os.path.join( config.site_dir, directory, file )) # Resolve path of image directory directory = os.path.dirname(path) if not os.path.isdir(directory): os.makedirs(directory) # Compute site name site_name = config.site_name # Compute page title and description title = page.meta.get("title", page.title) description = config.site_description or "" if "description" in page.meta: description = page.meta["description"] # Generate social card if not in cache - TODO: values from mkdocs.yml hash = md5("".join([ site_name, str(title), description ]).encode("utf-8")) file = os.path.join(self.cache, f"{hash.hexdigest()}.png") self._image_promises.append(self._executor.submit( self._cache_image, cache_path = file, dest_path = path, render_function = lambda: self._render_card(site_name, title, description) )) # Inject meta tags into page meta = page.meta.get("meta", []) page.meta["meta"] = meta + self._generate_meta(page, config) def on_post_build(self, config): if not self.config.cards: return # Check for exceptions for promise in self._image_promises: promise.result() # ------------------------------------------------------------------------- # Render image to cache (if not present), then copy from cache to site def _cache_image(self, cache_path, dest_path, render_function): if not os.path.isfile(cache_path): image = render_function() image.save(cache_path) # Copy file from cache copyfile(cache_path, dest_path) @functools.lru_cache(maxsize=None) def _get_font(self, kind, size): return ImageFont.truetype(self.font[kind], size) # Render social card def _render_card(self, site_name, title, description): # Render background and logo image = self._render_card_background((1200, 630), self.color["fill"]) image.alpha_composite( self._resized_logo_promise.result(), (1200 - 228, 64 - 4) ) # Render site name font = self._get_font("Bold", 36) image.alpha_composite( self._render_text((826, 48), font, site_name, 1, 20), (64 + 4, 64) ) # Render page title font = self._get_font("Bold", 92) image.alpha_composite( self._render_text((826, 328), font, title, 3, 30), (64, 160) ) # Render page description font = self._get_font("Regular", 28) image.alpha_composite( self._render_text((826, 80), font, description, 2, 14), (64 + 4, 512) ) # Return social card image return image # Render social card background def _render_card_background(self, size, fill): return Image.new(mode = "RGBA", size = size, color = fill) @functools.lru_cache(maxsize=None) def _tmp_context(self): image = Image.new(mode = "RGBA", size = (50, 50)) return ImageDraw.Draw(image) @functools.lru_cache(maxsize=None) def _text_bounding_box(self, text, font): return self._tmp_context().textbbox((0, 0), text, font = font) # Render social card text def _render_text(self, size, font, text, lmax, spacing = 0): width = size[0] lines, words = [], [] # Remove remnant HTML tags text = re.sub(r"(<[^>]+>)", "", text) # Retrieve y-offset of textbox to correct for spacing yoffset = 0 # Create drawing context and split text into lines for word in text.split(" "): combine = " ".join(words + [word]) textbox = self._text_bounding_box(combine, font = font) yoffset = textbox[1] if not words or textbox[2] <= width: words.append(word) else: lines.append(words) words = [word] # # Balance words on last line - TODO: overflows when broken word is too long # if len(lines) > 0: # prev = len(" ".join(lines[-1])) # last = len(" ".join(words))# # print(last, prev) # # Heuristic: try to find a good ratio # if last / prev < 0.6: # words.insert(0, lines[-1].pop()) # Join words for each line and create image lines.append(words) lines = [" ".join(line) for line in lines] image = Image.new(mode = "RGBA", size = size) # Create drawing context and split text into lines context = ImageDraw.Draw(image) context.text( (0, spacing / 2 - yoffset), "\n".join(lines[:lmax]), font = font, fill = self.color["text"], spacing = spacing - yoffset ) # Return text image return image # ------------------------------------------------------------------------- # Generate meta tags def _generate_meta(self, page, config): directory = self.config.cards_dir file, _ = os.path.splitext(page.file.src_uri) # Compute page title title = page.meta.get("title", page.title) if not page.is_homepage: title = f"{title} - {config.site_name}" # Compute page description description = config.site_description if "description" in page.meta: description = page.meta["description"] # Resolve image URL url = "{}.png".format(posixpath.join( config.site_url or ".", directory, file )) # Ensure forward slashes url = url.replace(os.path.sep, "/") # Return meta tags return [ # Meta tags for Open Graph { "property": "og:type", "content": "website" }, { "property": "og:title", "content": title }, { "property": "og:description", "content": description }, { "property": "og:image", "content": url }, { "property": "og:image:type", "content": "image/png" }, { "property": "og:image:width", "content": "1200" }, { "property": "og:image:height", "content": "630" }, { "property": "og:url", "content": page.canonical_url }, # Meta tags for Twitter { "name": "twitter:card", "content": "summary_large_image" }, # { "name": "twitter:site", "content": user }, # { "name": "twitter:creator", "content": user }, { "name": "twitter:title", "content": title }, { "name": "twitter:description", "content": description }, { "name": "twitter:image", "content": url } ] def _load_resized_logo(self, config, width = 144): logo = self._load_logo(config) height = int(width * logo.height / logo.width) return logo.resize((width, height)) # Retrieve logo image or icon def _load_logo(self, config): theme = config.theme # Handle images (precedence over icons) if "logo" in theme: _, extension = os.path.splitext(theme["logo"]) # Load SVG and convert to PNG path = os.path.join(config.docs_dir, theme["logo"]) if extension == ".svg": return self._load_logo_svg(path) # Load PNG, JPEG, etc. return Image.open(path).convert("RGBA") # Handle icons logo = "material/library" icon = theme["icon"] or {} if "logo" in icon and icon["logo"]: logo = icon["logo"] # Resolve path of package base = os.path.abspath(os.path.join( os.path.dirname(__file__), "../.." )) # Load icon data and fill with color path = f"{base}/.icons/{logo}.svg" return self._load_logo_svg(path, self.color["text"]) # Load SVG file and convert to PNG def _load_logo_svg(self, path, fill = None): file = BytesIO() data = open(path).read() # Fill with color, if given if fill: data = data.replace("