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Diffstat (limited to 'background/cookie_filter.js')
-rw-r--r-- | background/cookie_filter.js | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/background/cookie_filter.js b/background/cookie_filter.js new file mode 100644 index 0000000..fea2d23 --- /dev/null +++ b/background/cookie_filter.js @@ -0,0 +1,45 @@ +/** + * part of Hachette + * Filtering request headers to remove hachette cookies that might have slipped + * through. + * + * Copyright (C) 2021 Wojtek Kosior + * Redistribution terms are gathered in the `copyright' file. + */ + +/* + * IMPORTS_START + * IMPORT extract_signed + * IMPORTS_END + */ + +function is_valid_hachette_cookie(cookie) +{ + const match = /^hachette-(\w*)=(.*)$/.exec(cookie); + if (!match) + return false; + + return !extract_signed(match.slice(1, 3)).fail; +} + +function remove_hachette_cookies(header) +{ + if (header.name !== "Cookie") + return header; + + const cookies = header.value.split("; "); + const value = cookies.filter(c => !is_valid_hachette_cookie(c)).join("; "); + + return value ? {name: "Cookie", value} : null; +} + +function filter_cookie_headers(headers) +{ + return headers.map(remove_hachette_cookies).filter(h => h); +} + +/* + * EXPORTS_START + * EXPORT filter_cookie_headers + * EXPORTS_END + */ |