Module:IPblock
Documentation for this module may be created at Module:IPblock/doc
-- Calculate the minimum-sized blocks of IP addresses that cover each
-- IPv4 or IPv6 address entered in the arguments.
local bit32 = require('bit32')
local Collection -- a table to hold items
Collection = {
add = function (self, item)
if item ~= nil then
self.n = self.n + 1
self[self.n] = item
end
end,
join = function (self, sep)
return table.concat(self, sep)
end,
remove = function (self, pos)
if self.n > 0 and (pos == nil or (0 < pos and pos <= self.n)) then
self.n = self.n - 1
return table.remove(self, pos)
end
end,
sort = function (self, comp)
table.sort(self, comp)
end,
new = function ()
return setmetatable({n = 0}, Collection)
end
}
Collection.__index = Collection
local function empty(text)
-- Return true if text is nil or empty (assuming a string).
return text == nil or text == ''
end
local timestamps = {} -- cache
local function start_date(code, months)
-- Return a timestamp string for a URL to list user contributions
-- on and after the returned date.
-- The code specifies the wanted format.
-- For this module, only recent contributions are wanted, so the
-- timestamp is today's date less the given number of months (1 to 12).
local key = code .. months
if not timestamps[key] then
local date = os.date('!*t') -- today's UTC date
local y, m, d = date.year, date.month, date.day -- full year, month (1-12), day (1-31)
m = m - months
if m <= 0 then
m = m + 12
y = y - 1
end
local limit = m == 2 and 28 or 30
if d > limit then
d = limit -- good enough to ensure date is valid
end
timestamps['y-m-d' .. months] = string.format('%d-%02d-%02d', y, m, d)
timestamps['ymdHMS' .. months] = string.format('%d%02d%02d000000', y, m, d)
end
return timestamps[key] or ''
end
local note_text = {
range = '*Links for ranges show the contributions in the previous %s.',
gadget = [=[
*<span id="need-gadget"></span>Contributions links for IPv6 ranges need the "<span style="color:green;">Allow /16, /24 and /27 – /32 CIDR ranges on Special:Contributions forms</span>" gadget enabled in [[Special:Preferences#mw-prefsection-gadgets|Special:Preferences]], and scripting enabled in the browser.]=],
}
local function make_note(strings, key)
-- Record the fact that a particular note is needed, and return
-- wikitext for a link to the note or '' if no link needed.
if not strings.nonote then
strings.notes = strings.notes or {}
if not strings.notes[key] then
if key == 'gadget' then
strings.notes[key] = note_text[key]
elseif key == 'range' then
local when = 'month'
if strings.months > 1 then
when = strings.months .. ' months'
end
strings.notes[key] = string.format(note_text.range, when)
else
error('make_note: unexpected key')
end
end
if key == 'gadget' then
return ' [[#need-gadget|<sup>[note]</sup>]]'
end
end
return ''
end
local function describe_total(total, isalloc)
-- Return text describing given number of addresses or /64 allocations.
if total <= 9999 then
-- Can have fractions if total is the number of /64 allocations.
if total < 9 then
return (string.format('%.1f', total):gsub('%.0$', ''))
end
return string.format('%.0f', total)
end
if not isalloc then
local alloc = 2^64
if total >= alloc then
return describe_total(total / alloc, true) .. ' /64'
end
end
total = total/1024
local suffix = 'K'
if total >= 1024 then
total = total/1024
suffix = 'M'
if total >= 1024 then
total = total/1024
suffix = 'G'
if total > 64 then
return '>64G'
end
end
end
return string.format('%.0f', total) .. suffix
end
local function describe_size(ipsize, size)
-- Return text describing how many IPs are in a range with size = prefix length.
local function numtext(n)
if n <= 16 then
return tostring(2^n)
end
if n <= 19 then
return tostring(2^(n - 10)) .. 'K'
end
if n <= 29 then
return tostring(2^(n - 20)) .. 'M'
end
if n <= 36 then
return tostring(2^(n - 30)) .. 'G'
end
return '>64G'
end
local host = ipsize - size
if host <= 32 then
-- IPv4 or IPv6.
return numtext(host)
end
-- Must be IPv6.
if host <= 64 then
local s = ({
[64] = '1', [63] = '50%', [62] = '25%', [61] = '12%',
[60] = '6%', [59] = '3%', [58] = '2%'
})[host] or '<1%'
return s .. ' /64'
end
-- IPv6 with size < 64.
return numtext(host - 64) .. ' /64'
end
local function ipv6_string(ip)
-- Return a string equivalent to the given IPv6 address.
local z1, z2 -- indices of run of zeros to be displayed as "::"
local zstart, zcount
for i = 1, 9 do
-- Find left-most occurrence of longest run of two or more zeros.
if i < 9 and ip[i] == 0 then
if zstart then
zcount = zcount + 1
else
zstart = i
zcount = 1
end
else
if zcount and zcount > 1 then
if not z1 or zcount > z2 - z1 + 1 then
z1 = zstart
z2 = zstart + zcount - 1
end
end
zstart = nil
zcount = nil
end
end
local parts = Collection.new()
for i = 1, 8 do
if z1 and z1 <= i and i <= z2 then
if i == z1 then
if z1 == 1 or z2 == 8 then
if z1 == 1 and z2 == 8 then
return '::'
end
parts:add(':')
else
parts:add('')
end
end
else
parts:add(string.format('%x', ip[i]))
end
end
return parts:join(':')
end
local function ip_string(ip)
-- Return a string equivalent to given IP address (IPv4 or IPv6).
if ip.n == 2 then
-- IPv4.
local parts = {}
for i = 1, 2 do
local w = ip[i]
local q = i == 1 and 1 or 3
parts[q] = math.floor(w / 256)
parts[q+1] = w % 256
end
return table.concat(parts, '.')
end
return ipv6_string(ip)
end
-- Metatable for some operations on IP addresses.
local ipmt = {
__eq = function (lhs, rhs)
-- Return true if values in numbered tables match.
if lhs.n == rhs.n then
for i = 1, lhs.n do
if lhs[i] ~= rhs[i] then
return false
end
end
return true
end
return false
end,
__lt = function (lhs, rhs)
-- Return true if lhs < rhs; for sort.
if lhs.n == rhs.n then
for i = 1, lhs.n do
if lhs[i] ~= rhs[i] then
return lhs[i] < rhs[i]
end
end
return false
end
return lhs.n < rhs.n -- sort IPv4 before IPv6, although not needed
end,
}
local function ipv4_address(ip_str)
-- Return a collection of two 16-bit words (numbers) equivalent
-- to the IPv4 address given as a quad-dotted string, or
-- return nil if invalid.
-- This representation is for compatibility with IPv6 addresses.
local parts = Collection.new()
local s = ip_str:match('^%s*(.-)%s*$') .. '.'
for item in s:gmatch('(.-)%.') do
parts:add(item)
end
if parts.n == 4 then
for i, s in ipairs(parts) do
if s:match('^%d+$') then
local num = tonumber(s)
if 0 <= num and num <= 255 then
if num > 0 and s:match('^0') then
-- A redundant leading zero is an error because it is for an IP in octal.
return nil
end
parts[i] = num
else
return nil
end
else
return nil
end
end
local result = Collection.new()
for i = 1, 3, 2 do
result:add(parts[i] * 256 + parts[i+1])
end
return setmetatable(result, ipmt)
end
return nil
end
local function ipv6_address(ip_str)
-- Return a collection of eight 16-bit words (numbers) equivalent
-- to the IPv6 address given as a colon-delimited string, or
-- return nil if invalid.
local _, n = ip_str:gsub(':', ':')
if n < 7 then
ip_str, n = ip_str:gsub('::', string.rep(':', 9 - n))
end
local parts = Collection.new()
for item in (ip_str .. ':'):gmatch('(.-):') do
parts:add(item)
end
if parts.n == 8 then
for i, s in ipairs(parts) do
if s == '' then
parts[i] = 0
else
local num = tonumber('0x' .. s)
if num and 0 <= num and num <= 65535 then
parts[i] = num
else
return nil
end
end
end
return setmetatable(parts, ipmt)
end
return nil
end
local function common_length(num1, num2, nr_bits)
-- Return number of prefix bits that two integers have in common.
-- Number of bits in each number is nr_bits = 16, 8, 4, 2 or 1.
if nr_bits <= 1 then
return num1 == num2 and 1 or 0
end
local half = nr_bits / 2
local splitter = 2^half
local upper1, lower1 = math.modf(num1 / splitter)
local upper2, lower2 = math.modf(num2 / splitter)
if upper1 == upper2 then
lower1 = math.floor(lower1 * splitter + 0.5)
lower2 = math.floor(lower2 * splitter + 0.5)
return half + common_length(lower1, lower2, half)
end
return common_length(upper1, upper2, half)
end
local function common_prefix_length(ip1, ip2)
-- Return number of prefix bits that two IPs have in common.
-- Caller ensures that both IPs are IPv4 or both are IPv6.
local size = 0
for i = 1, ip1.n do
local w1, w2 = ip1[i], ip2[i]
if w1 == w2 then
size = size + 16
else
return size + common_length(w1, w2, 16)
end
end
return size
end
local function ip_prefix(ip, length)
-- Return a copy of ip masked to contain only the prefix of given length.
local result = { n = ip.n }
for i = 1, ip.n do
if length > 0 then
if length >= 16 then
result[i] = ip[i]
length = length - 16
else
result[i] = bit32.band(ip[i], bit32.arshift(0xffff8000, length - 1))
length = 0
end
else
result[i] = 0
end
end
return setmetatable(result, ipmt)
end
local function ip_incremented(ip)
-- Return a new IP equal to ip + 1.
-- Will wraparound (255.255.255.255 + 1 = 0.0.0.0)!
local result = { n = ip.n }
local carry = 1
for i = ip.n, 1, -1 do
local sum = ip[i] + carry
if sum >= 0x10000 then
carry = 1
sum = sum - 0x10000
else
carry = 0
end
result[i] = sum
end
return setmetatable(result, ipmt)
end
local function is_next_ip(ip1, ip2)
-- Return true if ip2 is the next IP after ip1 (ip2 == ip1 + 1).
-- IPs are sorted and unique so ip1 < ip2 and can ignore wrapping to zero.
-- This is lower overhead than making a new incremented IP then comparing.
if ip1 and ip2 then
local carry = 1
for i = ip1.n, 1, -1 do
local sum = ip1[i] + carry
if sum >= 0x10000 then
carry = 1
sum = sum - 0x10000
else
carry = 0
end
if sum ~= ip2[i] then
return false
end
end
return true
end
end
-- Each IP in a range except for the last IP has a 'common' field which is
-- a number specifying how many bits are common between the prefixes of this
-- IP and the next IP (0 if this IP starts with 0 and the next starts with 1).
-- Each non-empty range has exactly one "minimum common", that is, its value
-- of common is smaller than all others. That there is only one minimum common
-- follows from the fact that the IPs are unique and sorted.
local function make_range(iplist, ifirst, ilast)
-- Return a table for the range of IPs from iplist[ifirst] to iplist[ilast] inclusive.
local imin, vmin, done
if ifirst < ilast then
for i = ifirst, ilast - 1 do
-- Find the (unique) minimum of common lengths.
local common = iplist[i].common
if vmin then
if vmin > common then
vmin = common
imin = i
end
else
vmin = common
imin = i
end
end
else
vmin = iplist.ipsize
imin = ifirst
done = true
end
if vmin > iplist.allocation then
-- For IPv6, the default allocation is /64 and there is no point having
-- more precise ranges as they add unnecessary complexity.
-- However, using results=all sets allocation = 128 so vmin is not changed.
vmin = iplist.allocation
end
return {
ifirst = ifirst, -- index of first IP
ilast = ilast, -- index of last IP
imin = imin, -- index of IP with minimum common
size = vmin, -- number of common bits in prefix (the minimum)
prefix = ip_prefix(iplist[imin], vmin), -- IP table of the base IP
done = done, -- true if know that this range cannot be improved
}
end
local function split_range(iplist, range, depth)
-- Return a table of two or more ranges that more precisely target
-- the IPs in range, or return nothing if unable to improve range.
depth = depth and depth + 1 or 0
if depth <= 20 and -- 20 examines 1M contiguous addresses down to individual IPs
not range.done and
range.size < iplist.allocation and
range.ifirst < range.ilast then
local imin = range.imin
assert(imin and range.ifirst <= imin and imin < range.ilast)
local r1 = make_range(iplist, range.ifirst, range.imin)
local r2 = make_range(iplist, range.imin + 1, range.ilast)
local pointless = range.size + 1
if r1.size > pointless or r2.size > pointless then
return { r1, r2 }
end
local result = Collection.new()
local function store_split(range)
local split = split_range(iplist, range, depth)
if split then
for _, r in ipairs(split) do
result:add(r)
end
return true
else
result:add(range)
end
end
local improved1 = store_split(r1)
local improved2 = store_split(r2)
if improved1 or improved2 then
return result
end
end
range.done = true
end
local function better_summary(iplist, summary)
-- Return a better summary that more precisely targets the specified IPs,
-- or return nil if unable to improve the summary.
local better = Collection.new()
local improved
for _, range in ipairs(summary) do
local split = split_range(iplist, range)
if split then
improved = true
for _, r in ipairs(split) do
better:add(r)
end
else
better:add(range)
end
end
return improved and better
end
local function make_summaries(iplist)
-- Return a collection where each item is a summary.
-- A summary is a table of one or more ranges.
-- A summary covers all the given IPs and probably more.
-- A range is a table representing a CIDR block such as 1.2.248.0/21.
-- The first summary found is a single range; each subsequent summary
-- (if any) uses more ranges to better target the given IPs.
-- The result omits any summary with a range size that is too small (too many IPs).
local function good_size(summary)
for _, range in ipairs(summary) do
if range.size < iplist.minsize then
return false
end
end
return true
end
local summaries = Collection.new()
if iplist.n > 0 then
for i = 1, iplist.n - 1 do
-- Set length of prefixes common between each pair of IPs.
iplist[i].common = common_prefix_length(iplist[i], iplist[i+1])
end
local summary = { make_range(iplist, 1, iplist.n) }
while summary and summaries.n < iplist.maxresults do
if good_size(summary) then
summaries:add(summary)
end
summary = better_summary(iplist, summary)
end
end
return summaries
end
local function extract_ipv4(result, omitted, line)
-- Extract any IPv4 addresses from given line or throw error.
-- Accept CIDR /n to specify a range (only accept 16 to 32).
-- Addresses must be delimited with whitespace to reduce false positives.
local function store(hit)
local n = 32
local lhs, rhs = hit:match('^(.-)/(%d+)$')
if lhs then
hit = lhs
n = tonumber(rhs)
if not (n and 16 <= n and n <= 32) then
error('CIDR /n only accepts n = 16 to 32, invalid: ' .. lhs .. '/' .. rhs, 0)
end
end
local ip = ipv4_address(hit)
if ip then
if n == 32 then
result:add(ip)
else
if ip ~= ip_prefix(ip, n) then
error('Invalid base address (host bits should be zero): ' .. hit, 0)
end
for _ = 1, 2^(32 - n) do
result:add(ip)
ip = ip_incremented(ip)
end
end
else
omitted:add(hit)
end
end
line = line:gsub(':', ' ') -- so wikitext indents or other colons don't obscure an IVp4 address
for hit in line:gmatch('%S+') do
if hit:match('^%d+%.%d+[%.%d/]+$') then
local _, n = hit:gsub('%.', '.')
if n >= 3 then
store(hit)
end
end
end
end
local function extract_ipv6(result, omitted, line)
-- Extract any IPv6 addresses from given line or throw error.
-- Addresses must be delimited with whitespace to reduce false positives.
-- Want to accept all valid IPv6 despite the fact that contributors will
-- not have an address starting with ':'.
-- Also want to be able to parse arbitrary wikitext which might use colons
-- for indenting. To achieve that, if an address at the start of a line
-- is valid, use it; otherwise strip any leading colons and try again.
for pos, hit in line:gmatch('()(%S+)') do
local ipstr, length = hit:match('^([:%x]+)(/?%d*)$')
if ipstr then
local _, n = ipstr:gsub(':', ':')
if n >= 2 then
local ip = ipv6_address(ipstr)
if not ip and pos == 1 then
ipstr, n = ipstr:gsub('^:+', '')
if n > 0 then
ip = ipv6_address(ipstr)
end
end
if ip then
if length and #length > 0 then
error('CIDR /n not accepted for IPv6: ' .. hit, 0)
end
result:add(ip)
else
omitted:add(hit)
end
end
end
end
end
local function contribs(address, strings, ipbase, size)
-- Return a URL or wikilink to list the contributions for an IP or IP range,
-- or return an empty string if cannot do anything useful.
-- The given address is a string of either a single IP or a CIDR range.
-- If using old system:
-- For IPv6 CIDR, return a Special:Contributions link using an asterisk
-- wildcard which should work if the user has enabled the gadget
-- "Allow /16, /24 and /27 – /32 CIDR ranges on Special:Contributions".
local encoded, count = address:gsub('/', '%%2F')
if strings.want_old and count > 0 then
make_note(strings, 'range')
if address:find(':', 1, true) then
if ipbase and size then
local digits = math.floor(size / 4)
if digits < 3 then
digits = 3
end
local wildcard = digits % 4 == 0 and ':*' or '*'
local parts = {}
for i = 1, 8 do
local hex = string.format('%X', ipbase[i]) -- must be uppercase
if digits >= 4 then
parts[i] = hex
digits = digits - 4
if digits <= 0 then
break
end
else
local nz -- number of leading zeros in this group of four digits
if hex == '0' then
nz = 4
else
nz = 4 - #hex
end
if digits <= nz then
-- Cannot properly handle this case; have to omit group
-- because "0" never occurs as the first digit.
wildcard = ':*'
else
hex = string.rep('0', nz) .. hex -- four digits
parts[i] = hex:sub(1, digits)
end
break
end
end
address = table.concat(parts, ':') .. wildcard
local url = '[https://en.wikipedia.org/wiki/Special:Contributions/%s?ucstart=%s c]'
-- %s = IPv6 prefix address in uppercase with '*' wildcard at end
-- %s = Start date formatted 'yyyymmdd000000'
return string.format(url, address, start_date('ymdHMS', strings.months)) .. make_note(strings, 'gadget')
end
return '' -- no contributions link available
end
local url = '[https://tools.wmflabs.org/xtools/rangecontribs/?project=en.wikipedia.org&namespace=all&limit=50&text=%s&begin=%s c]'
-- %s = IPv4 CIDR range with '/' changed to '%2F'
-- %s = Start date formatted 'yyyy-mm-dd'
return string.format(url, encoded, start_date('y-m-d', strings.months))
end
return '[[Special:Contributions/' .. address .. '|c]]'
end
-- Strings for results using plain text.
-- The pre tags used are html which do not provide "nowiki",
-- but that is not required by the text used.
local plaintext = {
header = [=[
<pre>
Total Affected Given Range]=],
footer = '</pre>',
sumfirst = [=[
----------------------------------------------------------
%s%-12s %-12s %-11d %s%s]=],
-- %s = empty string (dummy for compatibility)
-- %s = total affected
-- %s = affected
-- %d = given (number of addresses given in input covered by this range)
-- %s = IP address range
-- %s = empty string
sumnext = [=[
%-12s %-11d %s%s]=],
-- %s = affected
-- %d = given
-- %s = IP address range
-- %s = empty string
}
-- Strings for results using a table in wikitext.
local wikitable = {
header = [=[
{| class="wikitable"
! Total<br />affected !! Affected<br />addresses !! Given<br />addresses !! Range !! Contribs]=],
footer = '|}',
sumfirst = [=[
|- style="background: darkgray; height: 6px;"
|colspan="5" |
|- style="vertical-align: top;"
|rowspan="%s" |%s ||%s ||%d ||%s ||%s]=],
-- %s = string of number of ranges in summary (number of rows)
-- %s = total affected
-- %s = affected
-- %d = given
-- %s = IP address range
-- %s = contributions link
sumnext = [=[
|-
|%s ||%d ||%s ||%s]=],
-- %s = affected
-- %d = given
-- %s = IP address range
-- %s = contributions link
}
local function show_summary(lines, strings, iplist, summary)
-- Show the summary by adding table wikitext or plain text to lines.
local want_plain = iplist.want_plain
local total = 0
for _, range in ipairs(summary) do
-- A number is a double which easily handles 2^128 = 3.4e38.
total = total + 2^(iplist.ipsize - range.size)
end
for i, range in ipairs(summary) do
local prefix = ip_string(range.prefix)
local size = range.size
local affected = describe_size(iplist.ipsize, size)
local given = range.ilast - range.ifirst + 1
local address
local link = ''
if size == iplist.ipsize then
address = prefix
if not want_plain then
link = contribs(address, strings)
end
else
address = prefix .. '/' .. size
if not want_plain then
link = contribs(address, strings, range.prefix, size)
end
end
local s
if i == 1 then
s = string.format(strings.sumfirst,
want_plain and '' or tostring(#summary),
describe_total(total),
affected, given, address, link)
else
s = string.format(strings.sumnext,
affected, given, address, link)
end
-- Pre tags returned by a module are html tags, not like wikitext <pre>...</pre>.
lines:add(want_plain and mw.text.nowiki(s) or s)
end
end
local function process_ips(lines, iplist, omitted)
-- Process a list of IP addresses, adding text of results to lines.
-- The list should contain either all IPv4 addresses, or all IPv6 (not a mixture).
local seq1, seq2, seqmany
local function show_sequence()
if seq1 and seq2 then
local text = ip_string(seq1)
if seqmany then
seqmany = false
text = text .. ' – ' .. ip_string(seq2)
end
seq1 = nil
seq2 = nil
local markup = text:sub(1, 1) == ':' and ':<nowiki/>' or ':'
lines:add(markup .. text)
end
end
local function show_ip(ip)
-- Show IP or record it to be included in a "from to" sequence of IPs.
if is_next_ip(seq2, ip) then
seq2 = ip
seqmany = true
else
show_sequence()
seq1 = ip
seq2 = ip
seqmany = false
end
end
if iplist.n < 1 then
return
end
if lines.n > 0 then
lines:add('')
end
if omitted.n > 0 then
lines:add('Warning, omitted as invalid: ' .. omitted:join(' '))
lines:add('')
end
local heading_line
if not iplist.nolist then
lines:add('') -- this blank line is replaced with a heading
heading_line = lines.n
end
local duplicates = Collection.new()
local previous
iplist:sort()
-- Check for duplicates which can interfere with method to get ranges.
for i, ip in ipairs(iplist) do
if previous == ip then
duplicates:add(i) -- index to omit duplicate later
elseif not iplist.nolist then
show_ip(ip)
end
previous = ip
end
show_sequence()
local duplicate_text = ''
if duplicates.n > 0 then
duplicate_text = ' (after omitting some duplicates)'
for i = duplicates.n, 1, -1 do
iplist:remove(duplicates[i])
end
end
local heading_text = string.format('Sorted %d %s address%s',
iplist.n,
iplist.ipname,
iplist.n == 1 and '' or 'es'
)
if heading_line then
lines[heading_line] = heading_text .. duplicate_text .. ':'
end
local strings = iplist.want_plain and plaintext or wikitable
strings.notes = nil -- needed when module is kept loaded for multiple tests
strings.want_old = iplist.want_old
strings.nonote = iplist.nonote
strings.months = iplist.months
lines:add(strings.header)
local upto = lines.n
for _, summary in ipairs(make_summaries(iplist)) do
show_summary(lines, strings, iplist, summary)
end
lines:add(strings.footer)
if upto + 1 == lines.n then
-- Show message in the very unlikely event that no results are found.
lines:add('----')
lines:add('No suitable ranges found; use <code>|results=all</code> to see all ranges.')
end
if strings.notes then
lines:add('')
lines:add("'''Notes'''")
for _, key in ipairs({'range', 'gadget'}) do
if strings.notes[key] then
lines:add(strings.notes[key])
end
end
end
end
local function make_options(args)
-- Return table of options from validated args or throw error.
local options = {}
if not empty(args.comment) then
options.comment = args.comment
end
-- Parameter 'months' is only used if 'old' is also used.
local months = math.floor(tonumber(args.months) or tonumber(args.month) or 1)
if months < 1 then
months = 1
elseif months > 12 then
months = 12
end
options.months = months -- silently ignore invalid input
local allocation
if not empty(args.allocation) then
allocation = tonumber(args.allocation)
if not (allocation and 48 <= allocation and allocation <= 128) then
error('Invalid allocation "' .. args.allocation .. '" (should be 48 to 128; default is 64)', 0)
end
end
local maxresults
if not empty(args.results) then
if args.results == 'all' then
options.all = true
allocation = allocation or 128
maxresults = 1000
else
maxresults = tonumber(args.results)
if not (maxresults and 1 <= maxresults and maxresults <= 100) then
error('Invalid results "' .. args.results .. '" (should be 1 to 100)', 0)
end
end
end
options.allocation = allocation or 64
options.maxresults = maxresults or 10
local keywords = {
-- Table of k, v strings.
-- If an argument matches k, an option named v is set to true.
ok = 'noannounce',
old = 'want_old',
nolist = 'nolist',
nonote = 'nonote',
text = 'text',
}
local want_old
for i, arg in ipairs(args) do
local flag = keywords[arg:match('^%s*(%w+)%s*$')]
if flag then
options[i] = 'skip'
options[flag] = true
if flag == 'want_old' then
want_old = true
end
end
end
if not want_old then
options.nonote = true
end
return options
end
local function _IPblock(args)
-- Process given args; can be called from another module.
-- Throw an error if need to report a problem.
local options = make_options(args)
local v4list, v4omitted = Collection.new(), Collection.new()
local v6list, v6omitted = Collection.new(), Collection.new()
v4list.ipsize = 32
v4list.ipname = 'IPv4'
v6list.ipsize = 128
v6list.ipname = 'IPv6'
v4list.allocation = 32
v6list.allocation = options.allocation
if options.all then
v4list.minsize = 0
v6list.minsize = 0
else
v4list.minsize = 16 -- cannot block more IPs than /16 for IPv4
v6list.minsize = 19 -- or /19 for IPv6 ($wgBlockCIDRLimit)
end
for _, k in ipairs({'maxresults', 'months', 'want_old', 'nolist', 'nonote'}) do
v4list[k] = options[k]
v6list[k] = options[k]
end
if options.text then
v4list.want_plain = true
v6list.want_plain = true
end
for i, arg in ipairs(args) do
if options[i] ~= 'skip' then
for line in string.gmatch(arg .. '\n', '[\t ]*(.-)[\t\r ]*\n') do
-- Skip line if is empty or a comment.
if line ~= '' then
local comment = options.comment
if not (comment and line:sub(1, #comment) == comment) then
-- Replace accepted delimiters with a space.
line = line:gsub('[!"#&\'()+,%-;<=>?[%]_{|}]', ' ')
extract_ipv4(v4list, v4omitted, line)
extract_ipv6(v6list, v6omitted, line)
end
end
end
end
end
if v4list.n < 1 and v6list.n < 1 then
error('No valid IPv4 or IPv6 address in arguments', 0)
end
local lines = Collection.new()
if not options.noannounce then
-- 1: Commented out April 2016 as expired.
-- 1: lines:add("'''Please see [[Template talk:Blockcalc#Version February 2016|this announcement]].'''")
-- 2: Commented out December 2017 as expired.
-- 2: lines:add("'''By default, links now use [[Special:Contributions]] per [[Template talk:IP range calculator#Version November 2017|this announcement]].'''")
end
process_ips(lines, v4list, v4omitted)
process_ips(lines, v6list, v6omitted)
return lines:join('\n')
end
local function IPblock(frame)
-- Return wikitext to display the smallest IPv4 or IPv6 CIDR range that
-- covers each address given in the arguments, or return error text.
-- Input can have any mixture of IPs; IPv4 and IPv6 are processed separately.
local ok, msg = pcall(_IPblock, frame:getParent().args)
if ok then
return msg
end
return '<strong class="error">Error: ' .. msg .. '</strong>'
end
return { IPblock = IPblock, _IPblock = _IPblock }