232 lines
7.2 KiB
Ruby
232 lines
7.2 KiB
Ruby
require "digest"
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require "ed25519"
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require "securerandom"
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require "set"
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require "fileutils"
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module Pigeon
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SEED_CONFIG_KEY = "SEED"
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TPL_DIR = File.join(".", "lib", "views")
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PIGEON_DB_PATH = File.join("pigeon.db")
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DEFAULT_BUNDLE_PATH = File.join(Dir.pwd, "bundle")
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DEFAULT_BLOB_DIR = File.join(Dir.home, "pigeon_sha256")
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MESSAGE_FILE = "messages.pgn"
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# MESSAGE TEMPLATE CONSTANTS:
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HEADER_TPL = [
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"author <%= author %>",
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"depth <%= depth %>",
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"kind <%= kind %>",
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"prev <%= prev %>",
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"\n",
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].join("\n")
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BODY_TPL = "<% body.to_a.each do |k, v| %><%= k %>:<%= v %><%= \"\\n\" %><% end %>\n"
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FOOTER_TPL = "signature <%= signature %>"
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COMPLETE_TPL = [HEADER_TPL, BODY_TPL, FOOTER_TPL].join("")
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CURRENT_DRAFT = "HEAD.draft"
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NOTHING = "NONE"
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OUTBOX_PATH = File.join(".pgn", "user")
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DRAFT_PLACEHOLDER = "DRAFT"
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CR = "\n"
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BUNDLE_MESSAGE_SEPARATOR = CR * 2
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# /MESSAGE TEMPLATE CONSTANTS
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# Internal namespaces for PStore keys:
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ROOT_NS = ".pgn"
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CONF_NS = "conf"
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PEER_NS = "peers"
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USER_NS = "user"
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BLCK_NS = "blocked"
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MESG_NS = "messages"
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MESSAGE_BY_DEPTH_NS = "messages.by_depth"
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COUNT_INDEX_NS = "messages.count"
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# ^ Internal namespaces for PStore keys
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BLOB_SIGIL = "FILE."
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MESSAGE_SIGIL = "TEXT."
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IDENTITY_SIGIL = "USER."
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STRING_SIGIL = "\""
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# Error messages
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PREV_REQUIRES_SAVE = "Can't fetch `prev` on unsaved messages"
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NO_DRAFT_FOUND = "NO DRAFT FOUND"
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STRING_KEYS_ONLY = "String keys only"
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MISSING_BODY = "BODY CANT BE EMPTY"
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STILL_HAVE_DRAFT = "RESET DRAFT (%s) FIRST (db.delete_current_draft)"
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MISSING_DRAFT = "NO DRAFT. CREATE ONE FIRST. Call db.new_draft(kind:, body:)"
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RUNAWAY_LOOP = "RUNAWAY LOOP DETECTED"
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# Constants for internal use only:
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BLOB_BYTE_LIMIT = 360_000
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class Helpers
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VERFIY_ERROR = "Expected field `%s` to equal %s, got: %s"
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MSG_SIZE_ERROR = "Messages cannot have more than 64 keys. Got %s."
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class VerificationError < StandardError; end
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class MessageSizeError < StandardError; end
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B32_ENC = {
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"00000" => "0", "00001" => "1", "00010" => "2", "00011" => "3",
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"00100" => "4", "00101" => "5", "00110" => "6", "00111" => "7",
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"01000" => "8", "01001" => "9", "01010" => "A", "01011" => "B",
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"01100" => "C", "01101" => "D", "01110" => "E", "01111" => "F",
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"10000" => "G", "10001" => "H", "10010" => "J", "10011" => "K",
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"10100" => "M", "10101" => "N", "10110" => "P", "10111" => "Q",
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"11000" => "R", "11001" => "S", "11010" => "T", "11011" => "V",
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"11100" => "W", "11101" => "X", "11110" => "Y", "11111" => "Z",
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}.freeze
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B32_DEC = {
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"0" => 0b00000, "O" => 0b00000, "1" => 0b00001, "I" => 0b00001,
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"L" => 0b00001, "2" => 0b00010, "3" => 0b00011, "4" => 0b00100,
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"5" => 0b00101, "6" => 0b00110, "7" => 0b00111, "8" => 0b01000,
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"9" => 0b01001, "A" => 0b01010, "B" => 0b01011, "C" => 0b01100,
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"D" => 0b01101, "E" => 0b01110, "F" => 0b01111, "G" => 0b10000,
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"H" => 0b10001, "J" => 0b10010, "K" => 0b10011, "M" => 0b10100,
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"N" => 0b10101, "P" => 0b10110, "Q" => 0b10111, "R" => 0b11000,
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"S" => 0b11001, "T" => 0b11010, "V" => 0b11011, "W" => 0b11100,
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"X" => 0b11101, "Y" => 0b11110, "Z" => 0b11111,
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}.freeze
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# http://www.crockford.com/wrmg/base32.html
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def self.b32_encode(string)
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string
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.each_byte
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.to_a
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.map { |x| x.to_s(2).rjust(8, "0") }
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.join
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.scan(/.{1,5}/)
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.map { |x| x.ljust(5, "0") }
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.map { |bits| B32_ENC.fetch(bits) }
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.join
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end
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# http://www.crockford.com/wrmg/base32.html
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def self.b32_decode(string)
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string
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.split("")
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.map { |x| B32_DEC.fetch(x.upcase) }
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.map { |x| x.to_s(2).rjust(5, "0") }
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.join("")
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.scan(/.{1,8}/)
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.map { |x| x.length == 8 ? x.to_i(2).chr : "" }
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.join("")
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end
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def self.verify_string(identity, string_signature, string)
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binary_signature = decode_multihash(string_signature)
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string_key = identity.multihash
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binary_key = decode_multihash(string_key)
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verify_key = Ed25519::VerifyKey.new(binary_key)
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verify_key.verify(binary_signature, string)
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end
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def self.assert(field, actual, expected)
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unless actual == expected
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message = VERFIY_ERROR % [field, actual || "nil", expected || "nil"]
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raise VerificationError, message
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end
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end
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def self.publish_draft(db, draft)
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author = db.who_am_i
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mhash = author.multihash
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template = MessageSerializer.new(draft)
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depth = db.get_message_count_for(mhash)
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draft.author = author
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draft.depth = depth
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draft.prev = db.get_message_by_depth(mhash, depth - 1)
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unsigned = template.render_without_signature
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draft.signature = author.sign(unsigned)
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tokens = Lexer.tokenize_unsigned(unsigned, draft.signature)
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message = Parser.parse(db, tokens)[0]
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db.delete_current_draft
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message
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end
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def self.update_draft(db, key, value)
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draft = db.get_draft
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draft[key] = value
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db._replace_draft(draft)
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return draft.body[key]
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end
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def self.verify_message(db, msg)
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msg_hash = msg.multihash
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body = msg.body
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key_count = body.count
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author = msg.author
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signature = msg.signature
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return db.read_message(msg_hash) if db.have_message?(msg_hash)
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if key_count > 64
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msg = MSG_SIZE_ERROR % key_count
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raise MessageSizeError, msg
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end
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count = db.get_message_count_for(author.multihash)
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expected_prev = db.get_message_by_depth(author.multihash, count - 1) || Pigeon::NOTHING
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assert("depth", count, msg.depth)
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assert("prev", msg.prev, expected_prev)
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tpl = msg.template.render_without_signature
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Helpers.verify_string(author, signature, tpl)
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msg.freeze
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msg
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end
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def self.mkdir_p(path)
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if !Dir.exists?(path)
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FileUtils.makedirs(path)
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end
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end
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def self.write_to_disk(base_path, mhash, data)
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p = Helpers.hash2file_path(mhash)
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file_name = p.pop
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Helpers.mkdir_p(base_path)
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dir = p.reduce(base_path) do |accum, item|
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path = File.join(accum, item)
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Helpers.mkdir_p(path)
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path
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end
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full_path = File.join(dir, file_name)
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unless File.file?(full_path)
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FileUtils.makedirs(dir)
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File.write(full_path, data)
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end
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end
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def self.hash2file_path(mhash)
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mhash = mhash.sub(BLOB_SIGIL, "")
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["#{mhash[0..3]}#{mhash[-4..-1]}.blb"]
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end
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def self.decode_multihash(string)
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case string[0..4]
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when BLOB_SIGIL, MESSAGE_SIGIL, IDENTITY_SIGIL
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return b32_decode(string[5..])
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else
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return b32_decode(string)
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end
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end
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end
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end
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require_relative File.join("pigeon", "version.rb")
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require_relative File.join("pigeon", "local_identity.rb")
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require_relative File.join("pigeon", "remote_identity.rb")
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require_relative File.join("pigeon", "storage.rb")
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require_relative File.join("pigeon", "message_serializer.rb")
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require_relative File.join("pigeon", "draft_serializer.rb")
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require_relative File.join("pigeon", "message.rb")
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require_relative File.join("pigeon", "draft.rb")
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require_relative File.join("pigeon", "lexer.rb")
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require_relative File.join("pigeon", "parser.rb")
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require_relative File.join("pigeon", "database.rb")
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