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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,7 @@ | ||
| { | ||
| "http://fonts.gstatic.com/s/notoemoji/v46/bMrnmSyK7YY-MEu6aWjPDs-ar6uWaGWuob_10jwvS-FGJCMY.ttf": "sha256-9ndQqJJzsCkR6KcYRNVW3wXWMxcH+0QzFgQQdCG8vSo=", | ||
| "http://fonts.gstatic.com/s/notoemoji/v46/bMrnmSyK7YY-MEu6aWjPDs-ar6uWaGWuob-r0jwvS-FGJCMY.ttf": "sha256-AXGLdWebddyJhTKMW/D/6tW8ODcaXrUM96m2hN9wYlg=", | ||
| "http://fonts.gstatic.com/s/notoemoji/v46/bMrnmSyK7YY-MEu6aWjPDs-ar6uWaGWuob-Z0jwvS-FGJCMY.ttf": "sha256-wzF9kKNMeQTYZ2QUT5pIgauhl2qMpZ2nMLNTeAJuqtQ=", | ||
| "http://fonts.gstatic.com/s/notoemoji/v46/bMrnmSyK7YY-MEu6aWjPDs-ar6uWaGWuob911TwvS-FGJCMY.ttf": "sha256-NIelE8X+lKtH6yT3eFPZV7zYUR3Y5GnNobAbf7AckR0=", | ||
| "http://fonts.gstatic.com/s/notoemoji/v46/bMrnmSyK7YY-MEu6aWjPDs-ar6uWaGWuob9M1TwvS-FGJCMY.ttf": "sha256-zkJuJ8YlTrUV+28wHIqny3yQvjvZqEPG4WXYmaLcY8A=" | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,30 @@ | ||
| { | ||
| "kind": "webfonts#webfontList", | ||
| "items": [ | ||
| { | ||
| "family": "Noto Emoji", | ||
| "variants": [ | ||
| "300", | ||
| "regular", | ||
| "500", | ||
| "600", | ||
| "700" | ||
| ], | ||
| "subsets": [ | ||
| "emoji" | ||
| ], | ||
| "version": "v46", | ||
| "lastModified": "2023-09-07", | ||
| "files": { | ||
| "300": "http://fonts.gstatic.com/s/notoemoji/v46/bMrnmSyK7YY-MEu6aWjPDs-ar6uWaGWuob_10jwvS-FGJCMY.ttf", | ||
| "regular": "http://fonts.gstatic.com/s/notoemoji/v46/bMrnmSyK7YY-MEu6aWjPDs-ar6uWaGWuob-r0jwvS-FGJCMY.ttf", | ||
| "500": "http://fonts.gstatic.com/s/notoemoji/v46/bMrnmSyK7YY-MEu6aWjPDs-ar6uWaGWuob-Z0jwvS-FGJCMY.ttf", | ||
| "600": "http://fonts.gstatic.com/s/notoemoji/v46/bMrnmSyK7YY-MEu6aWjPDs-ar6uWaGWuob911TwvS-FGJCMY.ttf", | ||
| "700": "http://fonts.gstatic.com/s/notoemoji/v46/bMrnmSyK7YY-MEu6aWjPDs-ar6uWaGWuob9M1TwvS-FGJCMY.ttf" | ||
| }, | ||
| "category": "sans-serif", | ||
| "kind": "webfonts#webfont", | ||
| "menu": "http://fonts.gstatic.com/s/notoemoji/v46/bMrnmSyK7YY-MEu6aWjPDs-ar6uWaGWuob-r0gwuQeU.ttf" | ||
| } | ||
| ] | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,183 @@ | ||
| #!/usr/bin/env nix-shell | ||
| #! nix-shell -i "python3 -I" -p python3 | ||
|
|
||
| from contextlib import contextmanager | ||
| from pathlib import Path | ||
| from typing import Iterable, Optional | ||
| from urllib import request | ||
|
|
||
| import hashlib, json | ||
|
|
||
|
|
||
| def getMetadata(apiKey: str, family: str = "Noto Emoji"): | ||
| '''Fetch the Google Fonts metadata for a given family. | ||
| An API key can be obtained by anyone with a Google account (🚮) from | ||
| `https://developers.google.com/fonts/docs/developer_api#APIKey` | ||
| ''' | ||
| from urllib.parse import urlencode | ||
|
|
||
| with request.urlopen( | ||
| "https://www.googleapis.com/webfonts/v1/webfonts?" + | ||
| urlencode({ 'key': apiKey, 'family': family }) | ||
| ) as req: | ||
| return json.load(req) | ||
|
|
||
| def getUrls(metadata) -> Iterable[str]: | ||
| '''Fetch all files' URLs from Google Fonts' metadata. | ||
| The metadata must obey the API v1 schema, and can be obtained from: | ||
| https://www.googleapis.com/webfonts/v1/webfonts?key=${GOOGLE_FONTS_TOKEN}&family=${FAMILY} | ||
| ''' | ||
| return ( url for i in metadata['items'] for _, url in i['files'].items() ) | ||
|
|
||
|
|
||
| def hashUrl(url: str, *, hash: str = 'sha256'): | ||
| '''Compute the hash of the data from HTTP GETing a given `url`. | ||
| The `hash` must be an algorithm name `hashlib.new` accepts. | ||
| ''' | ||
| with request.urlopen(url) as req: | ||
| return hashlib.new(hash, req.read()) | ||
|
|
||
|
|
||
| def sriEncode(h) -> str: | ||
| '''Encode a hash in the SRI format. | ||
| Takes a `hashlib` object, and produces a string that | ||
| nixpkgs' `fetchurl` accepts as `hash` parameter. | ||
| ''' | ||
| from base64 import b64encode | ||
| return f"{h.name}-{b64encode(h.digest()).decode()}" | ||
|
|
||
| def validateSRI(sri: Optional[str]) -> Optional[str]: | ||
| '''Decode an SRI hash, return `None` if invalid. | ||
| This is not a full SRI hash parser, hash options aren't supported. | ||
| ''' | ||
| from base64 import b64decode | ||
|
|
||
| if sri is None: | ||
| return None | ||
|
|
||
| try: | ||
| hashName, b64 = sri.split('-', 1) | ||
|
|
||
| h = hashlib.new(hashName) | ||
| digest = b64decode(b64, validate=True) | ||
| assert len(digest) == h.digest_size | ||
|
|
||
| except: | ||
| return None | ||
| else: | ||
| return sri | ||
|
|
||
|
|
||
| def hashUrls( | ||
| urls: Iterable[str], | ||
| knownHashes: dict[str, str] = {}, | ||
| ) -> dict[str, str]: | ||
| '''Generate a `dict` mapping URLs to SRI-encoded hashes. | ||
| The `knownHashes` optional parameter can be used to avoid | ||
| re-downloading files whose URL have not changed. | ||
| ''' | ||
| return { | ||
| url: validateSRI(knownHashes.get(url)) or sriEncode(hashUrl(url)) | ||
| for url in urls | ||
| } | ||
|
|
||
|
|
||
| @contextmanager | ||
| def atomicFileUpdate(target: Path): | ||
| '''Atomically replace the contents of a file. | ||
| Yields an open file to write into; upon exiting the context, | ||
| the file is closed and (atomically) replaces the `target`. | ||
| Guarantees that the `target` was either successfully overwritten | ||
| with new content and no exception was raised, or the temporary | ||
| file was cleaned up. | ||
| ''' | ||
| from tempfile import mkstemp | ||
| fd, _p = mkstemp( | ||
| dir = target.parent, | ||
| prefix = target.name, | ||
| ) | ||
| tmpPath = Path(_p) | ||
|
|
||
| try: | ||
| with open(fd, 'w') as f: | ||
| yield f | ||
|
|
||
| tmpPath.replace(target) | ||
|
|
||
| except Exception: | ||
| tmpPath.unlink(missing_ok = True) | ||
| raise | ||
|
|
||
|
|
||
| if __name__ == "__main__": | ||
| from os import environ | ||
| from urllib.error import HTTPError | ||
|
|
||
| environVar = 'GOOGLE_FONTS_TOKEN' | ||
| currentDir = Path(__file__).parent | ||
| metadataPath = currentDir / 'noto-emoji.json' | ||
|
|
||
| try: | ||
| apiToken = environ[environVar] | ||
| metadata = getMetadata(apiToken) | ||
|
|
||
| except (KeyError, HTTPError) as exn: | ||
| # No API key in the environment, or the query was rejected. | ||
| match exn: | ||
| case KeyError if exn.args[0] == environVar: | ||
| print(f"No '{environVar}' in the environment, " | ||
| "skipping metadata update") | ||
|
|
||
| case HTTPError if exn.getcode() == 403: | ||
| print("Got HTTP 403 (Forbidden)") | ||
| if apiToken != '': | ||
| print("Your Google API key appears to be valid " | ||
| "but does not grant access to the fonts API.") | ||
| print("Aborting!") | ||
| raise SystemExit(1) | ||
|
|
||
| case HTTPError if exn.getcode() == 400: | ||
| # Printing the supposed token should be fine, as this is | ||
| # what the API returns on invalid tokens. | ||
| print(f"Got HTTP 400 (Bad Request), is this really an API token: '{apiToken}' ?") | ||
| case _: | ||
| # Unknown error, let's bubble it up | ||
| raise | ||
|
|
||
| # In that case just use the existing metadata | ||
| with metadataPath.open() as metadataFile: | ||
| metadata = json.load(metadataFile) | ||
|
|
||
| lastModified = metadata["items"][0]["lastModified"]; | ||
| print(f"Using metadata from file, last modified {lastModified}") | ||
|
|
||
| else: | ||
| # If metadata was successfully fetched, validate and persist it | ||
| lastModified = metadata["items"][0]["lastModified"]; | ||
| print(f"Fetched current metadata, last modified {lastModified}") | ||
| with atomicFileUpdate(metadataPath) as metadataFile: | ||
| json.dump(metadata, metadataFile, indent = 2) | ||
| metadataFile.write("\n") # Pacify nixpkgs' dumb editor config check | ||
|
|
||
| hashPath = currentDir / 'noto-emoji.hashes.json' | ||
| try: | ||
| with hashPath.open() as hashFile: | ||
| hashes = json.load(hashFile) | ||
| except FileNotFoundError: | ||
| hashes = {} | ||
|
|
||
| with atomicFileUpdate(hashPath) as hashFile: | ||
| json.dump( | ||
| hashUrls(getUrls(metadata), knownHashes = hashes), | ||
| hashFile, | ||
| indent = 2, | ||
| ) | ||
| hashFile.write("\n") # Pacify nixpkgs' dumb editor config check |
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