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<?php
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function login__from_env()
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{
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return $_SERVER["PHP_AUTH_USER"]
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.($_SERVER["PHP_AUTH_PW"] !== "" ? ":".$_SERVER["PHP_AUTH_PW"] : "");
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}
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function user2path($user) # multiple @ and nested . OK: a@b.c@url -> url?b.c.a
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{
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$path = $user;
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# remove padding used to visually separate elements:__x__@y__@url -> x@y@url
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$path = preg_replace('/\b__|__\b/', '', $path);
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# remove category comments: x+y@url -> y@url
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# this special syntax is shorter than [x]_-_y@url
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# a UI can replace + with ' ' to produce a linewrap
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# can't use : for this because Firefox will not update the "password" for
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# the website with the new value after the :
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$path = preg_replace('/^.*?\+/', '', $path);
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# remove insertion comments: [c]x[d]@url -> x@url
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# use [] because in writing, [] denotes insertion
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# insertion indicates that the semantic meaning of the [] portion also
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# applies, even though it's not included in the linked term name
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$path = preg_replace('/\[.*?\]/', '', $path);
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# remove deletion comments: (-c_-)x@url -> c_x@url
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# use () because in editing, () denotes something to remove
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# the -...- indicate strikethrough (deletion)
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# deletion indicates that the semantic meaning of the () portion does not
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# apply, even though it's included in the linked term name
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$path = preg_replace('/\(-([^)]*?)-\)/', '$1', $path);
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# translate reverse @-paths into forward .-paths
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$path = implode(".", array_reverse(explode("@", $path)));
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return $path;
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}
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if (!isset($_SERVER["PHP_AUTH_USER"])) # browser first omits Authorization
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{
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header('WWW-Authenticate: Basic realm="'
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.'please leave username/password blank or as filled in. '
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.'**IMPORTANT**: to visit the homepage of this site, you should always '
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.'append \".\": \"'.$_SERVER["HTTP_HOST"].'.\" "');
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}
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else
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{
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$dest = preg_replace('!\b/!', "./", $_SERVER["SCRIPT_URI"])."?";
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# append trailing . to host to prevent infinite redirect loop
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if ($_SERVER["PHP_AUTH_USER"] !== "") # prepend to query string
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$dest .= "."/*force dotpath*/.user2path(login__from_env());
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$dest .= $_SERVER["QUERY_STRING"];
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header("Location: ".$dest);
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}
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?>
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