263 lines
7.9 KiB
Ruby
263 lines
7.9 KiB
Ruby
require "stringio"
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# The Potlatch module provides helper functions for potlatch and its communication with the server
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module Potlatch
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# The AMF class is a set of helper functions for encoding and decoding AMF.
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class AMF
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# Return two-byte integer
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def self.getint(s)
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s.getbyte * 256 + s.getbyte
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end
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# Return four-byte long
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def self.getlong(s)
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((s.getbyte * 256 + s.getbyte) * 256 + s.getbyte) * 256 + s.getbyte
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end
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# Return string with two-byte length
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def self.getstring(s)
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len = s.getbyte * 256 + s.getbyte
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str = s.read(len)
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str.force_encoding("UTF-8") if str.respond_to?("force_encoding")
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str
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end
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# Return eight-byte double-precision float
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def self.getdouble(s)
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a = s.read(8).unpack("G") # G big-endian, E little-endian
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a[0]
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end
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# Return numeric array
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def self.getarray(s)
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Array.new(getlong(s)) { getvalue(s) }
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end
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# Return object/hash
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def self.getobject(s)
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arr = {}
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while (key = getstring(s))
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break if key == ""
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arr[key] = getvalue(s)
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end
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s.getbyte # skip the 9 'end of object' value
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arr
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end
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# Parse and get value
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def self.getvalue(s)
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case s.getbyte
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when 0 then return getdouble(s) # number
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when 1 then return s.getbyte # boolean
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when 2 then return getstring(s) # string
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when 3 then return getobject(s) # object/hash
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when 5 then return nil # null
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when 6 then return nil # undefined
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when 8 then s.read(4) # mixedArray
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return getobject(s) # |
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when 10 then return getarray(s) # array
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else return nil # error
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end
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end
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# Envelope data into AMF writeable form
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def self.putdata(index, n)
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d = encodestring(index + "/onResult")
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d += encodestring("null")
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d += [-1].pack("N")
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d += encodevalue(n)
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d
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end
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# Pack variables as AMF
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def self.encodevalue(n)
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case n.class.to_s
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when "Array"
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a = 10.chr + encodelong(n.length)
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n.each do |b|
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a += encodevalue(b)
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end
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a
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when "Hash"
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a = 3.chr
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n.each do |k, v|
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a += encodestring(k.to_s) + encodevalue(v)
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end
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a + 0.chr + 0.chr + 9.chr
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when "String"
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2.chr + encodestring(n)
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when "Bignum", "Fixnum", "Float"
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0.chr + encodedouble(n)
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when "NilClass"
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5.chr
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when "TrueClass"
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0.chr + encodedouble(1)
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when "FalseClass"
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0.chr + encodedouble(0)
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else
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Rails.logger.error("Unexpected Ruby type for AMF conversion: " + n.class.to_s)
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end
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end
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# Encode string with two-byte length
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def self.encodestring(n)
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n = n.dup.force_encoding("ASCII-8BIT") if n.respond_to?("force_encoding")
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a, b = n.size.divmod(256)
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a.chr + b.chr + n
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end
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# Encode number as eight-byte double precision float
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def self.encodedouble(n)
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[n].pack("G")
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end
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# Encode number as four-byte long
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def self.encodelong(n)
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[n].pack("N")
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end
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end
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# The Dispatcher class handles decoding a series of RPC calls
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# from the request, dispatching them, and encoding the response
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class Dispatcher
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def initialize(request, &_block)
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# Get stream for request data
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@request = StringIO.new(request + 0.chr)
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# Skip version indicator and client ID
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@request.read(2)
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# Skip headers
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AMF.getint(@request).times do # Read number of headers and loop
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AMF.getstring(@request) # | skip name
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req.getbyte # | skip boolean
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AMF.getvalue(@request) # | skip value
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end
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# Capture the dispatch routine
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@dispatch = Proc.new
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end
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def each(&_block)
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# Read number of message bodies
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bodies = AMF.getint(@request)
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# Output response header
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a, b = bodies.divmod(256)
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yield 0.chr + 0.chr + 0.chr + 0.chr + a.chr + b.chr
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# Process the bodies
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bodies.times do # Read each body
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name = AMF.getstring(@request) # | get message name
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index = AMF.getstring(@request) # | get index in response sequence
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AMF.getlong(@request) # | get total size in bytes
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args = AMF.getvalue(@request) # | get response (probably an array)
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result = @dispatch.call(name, *args)
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yield AMF.putdata(index, result)
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end
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end
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end
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# The Potlatch class is a helper for Potlatch
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class Potlatch
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# ----- getpresets
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# in: none
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# does: reads tag preset menus, colours, and autocomplete config files
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# out: [0] presets, [1] presetmenus, [2] presetnames,
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# [3] colours, [4] casing, [5] areas, [6] autotags
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# (all hashes)
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def self.get_presets
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Rails.logger.info(" Message: getpresets")
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# Read preset menus
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presets = {}
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presetmenus = { "point" => [], "way" => [], "POI" => [] }
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presetnames = { "point" => {}, "way" => {}, "POI" => {} }
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presettype = ""
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presetcategory = ""
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# StringIO.open(txt) do |file|
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File.open("#{Rails.root}/config/potlatch/presets.txt") do |file|
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file.each_line do |line|
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t = line.chomp
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if t =~ %r{(\w+)/(\w+)}
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presettype = $1
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presetcategory = $2
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presetmenus[presettype].push(presetcategory)
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presetnames[presettype][presetcategory] = ["(no preset)"]
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elsif t =~ /^([\w\s]+):\s?(.+)$/
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pre = $1
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kv = $2
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presetnames[presettype][presetcategory].push(pre)
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presets[pre] = {}
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kv.split(",").each do |a|
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presets[pre][$1] = $2 if a =~ /^(.+)=(.*)$/
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end
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end
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end
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end
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# Read colours/styling
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colours = {}
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casing = {}
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areas = {}
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File.open("#{Rails.root}/config/potlatch/colours.txt") do |file|
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file.each_line do |line|
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next unless line.chomp =~ /(\w+)\s+([^\s]+)\s+([^\s]+)\s+([^\s]+)/
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tag = $1
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colours[tag] = $2.hex if $2 != "-"
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casing[tag] = $3.hex if $3 != "-"
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areas[tag] = $4.hex if $4 != "-"
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end
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end
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# Read relations colours/styling
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relcolours = {}
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relalphas = {}
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relwidths = {}
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File.open("#{Rails.root}/config/potlatch/relation_colours.txt") do |file|
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file.each_line do |line|
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next unless line.chomp =~ /(\w+)\s+([^\s]+)\s+([^\s]+)\s+([^\s]+)/
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tag = $1
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relcolours[tag] = $2.hex if $2 != "-"
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relalphas[tag] = $3.to_i if $3 != "-"
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relwidths[tag] = $4.to_i if $4 != "-"
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end
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end
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# Read POI presets
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icon_list = []
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icon_tags = {}
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File.open("#{Rails.root}/config/potlatch/icon_presets.txt") do |file|
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file.each_line do |line|
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(icon, tags) = line.chomp.split("\t")
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icon_list.push(icon)
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icon_tags[icon] = Hash[*tags.scan(/([^;=]+)=([^;=]+)/).flatten]
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end
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end
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icon_list.reverse!
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# Read auto-complete
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autotags = { "point" => {}, "way" => {}, "POI" => {} }
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File.open("#{Rails.root}/config/potlatch/autocomplete.txt") do |file|
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file.each_line do |line|
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next unless line.chomp =~ %r{^([\w:]+)/(\w+)\s+(.+)$}
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tag = $1
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type = $2
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values = $3
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autotags[type][tag] = if values == "-"
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[]
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else
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values.split(",").sort.reverse
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end
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end
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end
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[presets, presetmenus, presetnames, colours, casing, areas, autotags, relcolours, relalphas, relwidths, icon_list, {}, icon_tags]
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end
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end
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end
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