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import std/options
import js/regex
import types/url
#TODO add denyhost/s for blocklists
type URLFilter* = object
scheme: Option[string]
allowschemes: seq[string]
allowhost*: Option[string]
allowhosts: seq[Regex]
default: bool
proc newURLFilter*(scheme = none(string), allowschemes: seq[string] = @[],
allowhost = none(string), allowhosts: seq[Regex] = @[],
default = false): URLFilter =
doAssert scheme.isSome or allowschemes.len == 0,
"allowschemes without scheme is not supported"
return URLFilter(
scheme: scheme,
allowschemes: allowschemes,
allowhost: allowhost,
allowhosts: allowhosts,
default: default
)
# Filters as follows:
# If scheme/s are given, only URLs with the same scheme are matched.
# Then, allowhost and allowhosts are checked; if none of these match the host,
# the function returns the value of `default'.
proc match*(filter: URLFilter, url: URL): bool =
block check_scheme:
if filter.scheme.isSome and filter.scheme.get != url.scheme:
for scheme in filter.allowschemes:
if scheme == url.scheme:
break check_scheme
return false
let host = url.host
if filter.allowhost.isSome and filter.allowhost.get == host:
return true
for regex in filter.allowhosts:
if regex.match(host):
return true
return filter.default
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