Class: Nostr
Overview
Instance Attribute Summary collapse
Class Method Summary
collapse
Instance Method Summary
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#bech32_keys ⇒ Object
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#build_close_event(subscription_id) ⇒ Object
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#build_contact_list_event(contacts) ⇒ Object
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#build_deletion_event(events, reason = '') ⇒ Object
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#build_dm_event(text, recipient_public_key) ⇒ Object
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#build_event(payload) ⇒ Object
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#build_metadata_event(name, about, picture, nip05) ⇒ Object
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#build_note_event(text, channel_key = nil) ⇒ Object
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#build_notice_event(message) ⇒ Object
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#build_reaction_event(reaction, event, author) ⇒ Object
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#build_recommended_relay_event(relay) ⇒ Object
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#build_req_event(filters) ⇒ Object
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#decrypt_dm(event) ⇒ Object
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#get_delegation_tag(delegatee_pubkey, conditions) ⇒ Object
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#initialize(key) ⇒ Nostr
constructor
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#keys ⇒ Object
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#match_pow_difficulty?(event_id) ⇒ Boolean
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#reset_delegation ⇒ Object
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#set_delegation(tag) ⇒ Object
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#set_pow_difficulty_target(n) ⇒ Object
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#sign_event(event) ⇒ Object
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#test_post_event(event, relay) ⇒ Object
aes_256_cbc_decrypt, aes_256_cbc_encrypt, calculate_shared_key
Constructor Details
#initialize(key) ⇒ Nostr
Returns a new instance of Nostr.
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# File 'lib/nostr_ruby.rb', line 18
def initialize(key)
hex_private_key = if key[:private_key]&.include?('nsec')
Nostr.to_hex(key[:private_key])
else
key[:private_key]
end
hex_public_key = if key[:public_key]&.include?('npub')
Nostr.to_hex(key[:public_key])
else
key[:public_key]
end
if hex_private_key
@private_key = hex_private_key
group = ECDSA::Group::Secp256k1
@public_key = group.generator.multiply_by_scalar(private_key.to_i(16)).x.to_s(16).rjust(64, '0')
elsif hex_public_key
@public_key = hex_public_key
else
raise 'Missing private or public key'
end
end
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Instance Attribute Details
#nip26_delegation_tag ⇒ Object
Returns the value of attribute nip26_delegation_tag.
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# File 'lib/nostr_ruby.rb', line 16
def nip26_delegation_tag
@nip26_delegation_tag
end
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#pow_difficulty_target ⇒ Object
Returns the value of attribute pow_difficulty_target.
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# File 'lib/nostr_ruby.rb', line 16
def pow_difficulty_target
@pow_difficulty_target
end
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#private_key ⇒ Object
Returns the value of attribute private_key.
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# File 'lib/nostr_ruby.rb', line 16
def private_key
@private_key
end
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#public_key ⇒ Object
Returns the value of attribute public_key.
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# File 'lib/nostr_ruby.rb', line 16
def public_key
@public_key
end
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Class Method Details
.to_bech32(hex_key, hrp) ⇒ Object
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# File 'lib/nostr_ruby.rb', line 59
def self.to_bech32(hex_key, hrp)
custom_addr = CustomAddr.new
custom_addr.scriptpubkey = hex_key
custom_addr.hrp = hrp
custom_addr.addr
end
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.to_hex(bech32_key) ⇒ Object
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# File 'lib/nostr_ruby.rb', line 54
def self.to_hex(bech32_key)
public_addr = CustomAddr.new(bech32_key)
public_addr.to_scriptpubkey
end
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.verify_delegation_signature(delegatee_pubkey, tag) ⇒ Object
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# File 'lib/nostr_ruby.rb', line 242
def self.verify_delegation_signature(delegatee_pubkey, tag)
delegation_message_sha256 = Digest::SHA256.hexdigest("nostr:delegation:#{delegatee_pubkey}:#{tag[2]}")
Schnorr.valid_sig?(Array(delegation_message_sha256).pack('H*'), Array(tag[1]).pack('H*'), Array(tag[3]).pack('H*'))
end
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Instance Method Details
#bech32_keys ⇒ Object
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# File 'lib/nostr_ruby.rb', line 48
def bech32_keys
bech32_keys = { public_key: Nostr.to_bech32(@public_key, 'npub') }
bech32_keys[:private_key] = Nostr.to_bech32(@private_key, 'nsec') if @private_key
bech32_keys
end
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#build_close_event(subscription_id) ⇒ Object
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# File 'lib/nostr_ruby.rb', line 251
def build_close_event(subscription_id)
['CLOSE', subscription_id]
end
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# File 'lib/nostr_ruby.rb', line 161
def build_contact_list_event(contacts)
event = {
"pubkey": @public_key,
"created_at": Time.now.utc.to_i,
"kind": 3,
"tags": contacts.map { |c| ['p'] + c },
"content": ''
}
build_event(event)
end
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#build_deletion_event(events, reason = '') ⇒ Object
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# File 'lib/nostr_ruby.rb', line 187
def build_deletion_event(events, reason = '')
event = {
"pubkey": @public_key,
"created_at": Time.now.utc.to_i,
"kind": 5,
"tags": events.map{ |e| ['e', e] },
"content": reason
}
build_event(event)
end
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#build_dm_event(text, recipient_public_key) ⇒ Object
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# File 'lib/nostr_ruby.rb', line 173
def build_dm_event(text, recipient_public_key)
encrypted_text = CryptoTools.aes_256_cbc_encrypt(@private_key, recipient_public_key, text)
event = {
"pubkey": @public_key,
"created_at": Time.now.utc.to_i,
"kind": 4,
"tags": [['p', recipient_public_key]],
"content": encrypted_text
}
build_event(event)
end
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#build_event(payload) ⇒ Object
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# File 'lib/nostr_ruby.rb', line 109
def build_event(payload)
if @nip26_delegation_tag
payload[:tags] = [] unless payload[:tags]
payload[:tags] << @nip26_delegation_tag
end
event = sign_event(payload)
['EVENT', event]
end
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# File 'lib/nostr_ruby.rb', line 118
def build_metadata_event(name, about, picture, nip05)
data = {}
data[:name] = name if name
data[:about] = about if about
data[:picture] = picture if picture
data[:nip05] = nip05 if nip05
event = {
"pubkey": @public_key,
"created_at": Time.now.utc.to_i,
"kind": 0,
"tags": [],
"content": data.to_json
}
build_event(event)
end
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#build_note_event(text, channel_key = nil) ⇒ Object
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# File 'lib/nostr_ruby.rb', line 135
def build_note_event(text, channel_key = nil)
event = {
"pubkey": @public_key,
"created_at": Time.now.utc.to_i,
"kind": channel_key ? 42 : 1,
"tags": channel_key ? [['e', channel_key]] : [],
"content": text
}
build_event(event)
end
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#build_notice_event(message) ⇒ Object
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# File 'lib/nostr_ruby.rb', line 255
def build_notice_event(message)
['NOTICE', message]
end
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#build_reaction_event(reaction, event, author) ⇒ Object
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# File 'lib/nostr_ruby.rb', line 199
def build_reaction_event(reaction, event, author)
raise 'Invalid reaction' unless ['+', '-'].include?(reaction) || reaction.match?(Unicode::Emoji::REGEX)
raise 'Invalid author' unless event.is_a?(String) && event.size == 64
raise 'Invalid event' unless author.is_a?(String) && author.size == 64
event = {
"pubkey": @public_key,
"created_at": Time.now.utc.to_i,
"kind": 7,
"tags": [['e', event], ['p', author]],
"content": reaction
}
build_event(event)
end
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#build_recommended_relay_event(relay) ⇒ Object
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# File 'lib/nostr_ruby.rb', line 147
def build_recommended_relay_event(relay)
raise 'Invalid relay' unless relay.start_with?('wss://') || relay.start_with?('ws://')
event = {
"pubkey": @public_key,
"created_at": Time.now.utc.to_i,
"kind": 2,
"tags": [],
"content": relay
}
build_event(event)
end
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#build_req_event(filters) ⇒ Object
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# File 'lib/nostr_ruby.rb', line 247
def build_req_event(filters)
['REQ', SecureRandom.random_number.to_s, filters]
end
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#decrypt_dm(event) ⇒ Object
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# File 'lib/nostr_ruby.rb', line 215
def decrypt_dm(event)
data = event[1]
sender_public_key = data[:pubkey] != @public_key ? data[:pubkey] : data[:tags][0][1]
encrypted = data[:content].split('?iv=')[0]
iv = data[:content].split('?iv=')[1]
CryptoTools.aes_256_cbc_decrypt(@private_key, sender_public_key, encrypted, iv)
end
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#get_delegation_tag(delegatee_pubkey, conditions) ⇒ Object
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# File 'lib/nostr_ruby.rb', line 223
def get_delegation_tag(delegatee_pubkey, conditions)
delegation_message_sha256 = Digest::SHA256.hexdigest("nostr:delegation:#{delegatee_pubkey}:#{conditions}")
signature = Schnorr.sign(Array(delegation_message_sha256).pack('H*'), Array(@private_key).pack('H*')).encode.unpack('H*')[0]
[
"delegation",
@public_key,
conditions,
signature
]
end
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#keys ⇒ Object
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# File 'lib/nostr_ruby.rb', line 42
def keys
keys = { public_key: @public_key }
keys[:private_key] = @private_key if @private_key
keys
end
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#match_pow_difficulty?(event_id) ⇒ Boolean
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# File 'lib/nostr_ruby.rb', line 259
def match_pow_difficulty?(event_id)
@pow_difficulty_target.nil? || @pow_difficulty_target == [event_id].pack("H*").unpack("B*")[0].index('1')
end
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#reset_delegation ⇒ Object
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# File 'lib/nostr_ruby.rb', line 238
def reset_delegation
@nip26_delegation_tag = nil
end
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#set_delegation(tag) ⇒ Object
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# File 'lib/nostr_ruby.rb', line 234
def set_delegation(tag)
@nip26_delegation_tag = tag
end
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#set_pow_difficulty_target(n) ⇒ Object
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# File 'lib/nostr_ruby.rb', line 263
def set_pow_difficulty_target(n)
@pow_difficulty_target = n
end
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#sign_event(event) ⇒ Object
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# File 'lib/nostr_ruby.rb', line 66
def sign_event(event)
raise 'Invalid pubkey' unless event[:pubkey].is_a?(String) && event[:pubkey].size == 64
raise 'Invalid created_at' unless event[:created_at].is_a?(Integer)
raise 'Invalid kind' unless (0..29_999).include?(event[:kind])
raise 'Invalid tags' unless event[:tags].is_a?(Array)
raise 'Invalid content' unless event[:content].is_a?(String)
serialized_event = [
0,
event[:pubkey],
event[:created_at],
event[:kind],
event[:tags],
event[:content]
]
serialized_event_sha256 = nil
if @pow_difficulty_target
nonce = 1
loop do
nonce_tag = ['nonce', nonce.to_s, @pow_difficulty_target.to_s]
nonced_serialized_event = serialized_event.clone
nonced_serialized_event[4] = nonced_serialized_event[4] + [nonce_tag]
serialized_event_sha256 = Digest::SHA256.hexdigest(JSON.dump(nonced_serialized_event))
if match_pow_difficulty?(serialized_event_sha256)
event[:tags] << nonce_tag
break
end
nonce += 1
end
else
serialized_event_sha256 = Digest::SHA256.hexdigest(JSON.dump(serialized_event))
end
private_key = Array(@private_key).pack('H*')
message = Array(serialized_event_sha256).pack('H*')
event_signature = Schnorr.sign(message, private_key).encode.unpack('H*')[0]
event['id'] = serialized_event_sha256
event['sig'] = event_signature
event
end
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#test_post_event(event, relay) ⇒ Object
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# File 'lib/nostr_ruby.rb', line 267
def test_post_event(event, relay)
response = nil
ws = WebSocket::Client::Simple.connect relay
ws.on :message do |msg|
puts msg
response = JSON.parse(msg.data)
ws.close
end
ws.on :open do
ws.send event.to_json
end
while response.nil? do
sleep 0.1
end
response[0] == 'OK'
end
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