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Basicauthetication and verify the password from PasswordFile. PasswordFile is a file holding usernames and passwords in a format compatible to Unix and Apache. Each line is record with
:separated fields. The first field is the username and the second the password hash. Password hashes are validated using crypt/2.
Successful authorization is cached for 60 seconds to avoid overhead of decoding and lookup of the user and password data.
http_authenticate/3 just validates the header. If authorization is not provided the browser must be challenged, in response to which it normally opens a user-password dialogue. Example code realising this is below. The exception causes the HTTP wrapper code to generate an HTTP 401 reply.
( http_authenticate(basic(passwd), Request, Fields) -> true ; throw(http_reply(authorise(basic, Realm))) ).
|Fields||is a list of fields from the password-file entry. The first element is the user. The hash is skipped.|