1#!/usr/bin/ruby
2# frozen_string_literal: true
3
4# Usage: bin/process_pending-btc_transactions '{
5# oxr_app_id = "",
6# required_confirmations = 3,
7# notify_using = {
8# jid = "",
9# password = "",
10# target = \(jid: Text) -> "+12266669977@cheogram.com",
11# body = \(jid: Text) -> \(body: Text) -> "/msg ${jid} ${body}",
12# },
13# electrum = env:ELECTRUM_CONFIG,
14# plans = ./plans.dhall,
15# activation_amount = 10000
16# }'
17
18require "bigdecimal"
19require "dhall"
20require "money/bank/open_exchange_rates_bank"
21require "net/http"
22require "nokogiri"
23require "pg"
24require "redis"
25
26require_relative "../lib/blather_notify"
27require_relative "../lib/electrum"
28
29CONFIG =
30 Dhall::Coder
31 .new(safe: Dhall::Coder::JSON_LIKE + [Symbol, Proc])
32 .load(ARGV[0], transform_keys: :to_sym)
33
34REDIS = Redis.new
35ELECTRUM = Electrum.new(**CONFIG[:electrum])
36
37DB = PG.connect(dbname: "jmp")
38DB.type_map_for_results = PG::BasicTypeMapForResults.new(DB)
39DB.type_map_for_queries = PG::BasicTypeMapForQueries.new(DB)
40
41BlatherNotify.start(
42 CONFIG[:notify_using][:jid],
43 CONFIG[:notify_using][:password]
44)
45
46unless (cad_to_usd = REDIS.get("cad_to_usd")&.to_f)
47 oxr = Money::Bank::OpenExchangeRatesBank.new(Money::RatesStore::Memory.new)
48 oxr.app_id = CONFIG.fetch(:oxr_app_id)
49 oxr.update_rates
50 cad_to_usd = oxr.get_rate("CAD", "USD")
51 REDIS.set("cad_to_usd", cad_to_usd, ex: 60*60)
52end
53
54canadianbitcoins = Nokogiri::HTML.parse(
55 Net::HTTP.get(URI("https://www.canadianbitcoins.com"))
56)
57
58bitcoin_row = canadianbitcoins.at("#ticker > table > tbody > tr")
59raise "Bitcoin row has moved" unless bitcoin_row.at("td").text == "Bitcoin"
60
61btc_sell_price = {}
62btc_sell_price[:CAD] = BigDecimal.new(
63 bitcoin_row.at("td:nth-of-type(3)").text.match(/^\$(\d+\.\d+)/)[1]
64)
65btc_sell_price[:USD] = btc_sell_price[:CAD] * cad_to_usd
66
67class Plan
68 def self.for_customer(customer)
69 row = DB.exec_params(<<-SQL, [customer.id]).first
70 SELECT plan_name FROM customer_plans WHERE customer_id=$1 LIMIT 1
71 SQL
72 from_name(customer, row&.[]("plan_name"))
73 end
74
75 def self.pending_for_customer(customer)
76 from_name(
77 customer,
78 REDIS.get("pending_plan_for-#{customer.id}"),
79 klass: Pending
80 )
81 end
82
83 def self.from_name(customer, plan_name, klass: Plan)
84 return unless plan_name
85 plan = CONFIG[:plans].find { |p| p[:name] == plan_name }
86 klass.new(customer, plan) if plan
87 end
88
89 def initialize(customer, plan)
90 @customer = customer
91 @plan = plan
92 end
93
94 def name
95 @plan[:name]
96 end
97
98 def currency
99 @plan[:currency]
100 end
101
102 def bonus_for(fiat_amount)
103 return BigDecimal.new(0) if fiat_amount <= 15
104 fiat_amount * case fiat_amount
105 when (15..29.99)
106 0.01
107 when (30..139.99)
108 0.03
109 else
110 0.05
111 end
112 end
113
114 def price
115 BigDecimal.new(@plan[:monthly_price].to_i) * 0.0001
116 end
117
118 def insert(start:, expire:)
119 params = [@customer.id, name, start, expire]
120 DB.exec_params(<<-SQL, params)
121 INSERT INTO plan_log
122 (customer_id, plan_name, date_range)
123 VALUES
124 ($1, $2, tsrange($3, $4))
125 SQL
126 end
127
128 def activate_any_pending_plan!; end
129
130 class Pending < Plan
131 def initialize(customer, plan)
132 super
133 @go_until = Date.today >> 1
134 end
135
136 def activation_amount
137 camnt = BigDecimal.new(CONFIG[:activation_amount].to_i) * 0.0001
138 [camnt, price].max
139 end
140
141 def activate_any_pending_plan!
142 if @customer.balance < activation_amount
143 @customer.notify(
144 "Your account could not be activated because your " \
145 "balance of $#{@customer.balance} is less that the " \
146 "required activation amount of $#{activation_amount}. " \
147 "Please buy more credit to have your account activated."
148 )
149 else
150 charge_insert_notify
151 end
152 end
153
154 protected
155
156 def charge_insert_notify
157 return unless @customer.add_transaction(
158 "activate_#{@customer.id}_#{name}_until_#{@go_until}",
159 -price,
160 "Activate pending plan"
161 )
162 insert(start: Date.today, expire: @go_until)
163 REDIS.del("pending_plan_for-#{@customer.id}")
164 notify_approved
165 end
166
167 def notify_approved
168 @customer.notify(
169 "Your JMP account has been approved. To complete " \
170 "your signup, click/tap here: xmpp:cheogram.com " \
171 "and send register jmp.chat to the bot."
172 )
173 end
174 end
175end
176
177class Customer
178 def initialize(customer_id)
179 @customer_id = customer_id
180 end
181
182 def id
183 @customer_id
184 end
185
186 def notify(body)
187 jid = REDIS.get("jmp_customer_jid-#{@customer_id}")
188 raise "No JID for #{customer_id}" unless jid
189 BlatherNotify.say(
190 CONFIG[:notify_using][:target].call(jid),
191 CONFIG[:notify_using][:body].call(jid, body)
192 )
193 end
194
195 def plan
196 Plan.for_customer(self) || pending_plan
197 end
198
199 def pending_plan
200 Plan.pending_for_customer(self)
201 end
202
203 def balance
204 result = DB.exec_params(<<-SQL, [@customer_id]).first&.[]("balance")
205 SELECT balance FROM balances WHERE customer_id=$1
206 SQL
207 result || BigDecimal.new(0)
208 end
209
210 def add_btc_credit(txid, btc_amount, fiat_amount)
211 return unless add_transaction(txid, fiat_amount, "Bitcoin payment")
212 if (bonus = plan.bonus_for(fiat_amount)) > 0
213 add_transaction("bonus_for_#{txid}", bonus, "Bitcoin payment bonus")
214 end
215 notify_btc_credit(txid, btc_amount, fiat_amount, bonus)
216 end
217
218 def notify_btc_credit(txid, btc_amount, fiat_amount, bonus)
219 tx_hash, = txid.split("/", 2)
220 notify([
221 "Your Bitcoin transaction of #{btc_amount.to_s('F')} BTC ",
222 "has been added as $#{'%.4f' % fiat_amount} (#{plan.currency}) ",
223 ("+ $#{'%.4f' % bonus} bonus " if bonus > 0),
224 "to your account.\n(txhash: #{tx_hash})"
225 ].compact.join)
226 end
227
228 def add_transaction(id, amount, note)
229 DB.exec_params(<<-SQL, [@customer_id, id, amount, note]).cmd_tuples > 0
230 INSERT INTO transactions
231 (customer_id, transaction_id, amount, note)
232 VALUES
233 ($1, $2, $3, $4)
234 ON CONFLICT (transaction_id) DO NOTHING
235 SQL
236 end
237end
238
239done = REDIS.hgetall("pending_btc_transactions").map do |(txid, customer_id)|
240 tx_hash, address = txid.split("/", 2)
241 transaction = ELECTRUM.gettransaction(tx_hash)
242 next unless transaction.confirmations >= CONFIG[:required_confirmations]
243 btc = transaction.amount_for(address)
244 if btc <= 0
245 # This is a send, not a receive, do not record it
246 REDIS.hdel("pending_btc_transactions", txid)
247 next
248 end
249 DB.transaction do
250 customer = Customer.new(customer_id)
251 if (plan = customer.plan)
252 amount = btc * btc_sell_price.fetch(plan.currency).round(4, :floor)
253 customer.add_btc_credit(txid, btc, amount)
254 customer.plan.activate_any_pending_plan!
255 REDIS.hdel("pending_btc_transactions", txid)
256 txid
257 else
258 warn "No plan for #{customer_id} cannot save #{txid}"
259 end
260 end
261end
262
263puts done.compact.join("\n")