Derive pub/priv key from stored seed.

Co-authored-by: Michael Christenson II <m3talsmith@gmail.com>

dist/pigeon/key_pair.rb

@@ -4,6 +4,7 @@ module Pigeon
   # changes.
   class KeyPair
     HEADER, FOOTER = ["@", ".ed25519"]
+    SEED_CONFIG_KEY = "SEED"
 
     def self.strip_headers(identity)
       identity.sub(HEADER, "").sub(FOOTER, "")
@@ -13,6 +14,11 @@ module Pigeon
       [HEADER, urlsafe_b64_no_headers, FOOTER].join("")
     end
 
+    def self.current
+      storage = Pigeon::Storage.current
+      self.new(storage.get_conf(SEED_CONFIG_KEY))
+    end
+
     # `seed` is a 32-byte seed value from which
     #  the key should be derived
     def initialize(seed = SecureRandom.random_bytes(Ed25519::KEY_SIZE))
@@ -31,17 +37,8 @@ module Pigeon
       @public_key ||= KeyPair.add_headers(b64)
     end
 
-    def to_h
-      {
-        public_key: public_key,
-        private_key: private_key,
-      }
-    end
-
     def save!
-      self.to_h.map do |k, v|
-        Pigeon::Storage.current.set_conf(k, v)
-      end
+      Pigeon::Storage.current.set_conf(SEED_CONFIG_KEY, @seed)
     end
   end
 end

dist/pigeon/message.rb

@@ -17,9 +17,9 @@ module Pigeon
       @body = body
     end
 
-    def self.create(author:, kind:, previous: nil, body: [])
+    def self.create(kind:, previous: nil, body: [])
       # instantiate
-      msg = self.new(author: author,
+      msg = self.new(author: KeyPair.current.public_key,
                      kind: kind,
                      previous: previous,
                      body: body)

dist/pigeon/storage.rb

@@ -27,6 +27,7 @@ module Pigeon
     def set_conf(key, value)
       path = conf_path_for(key)
       maybe_touch(path)
+
       File.write(path, value.to_s)
     end
 

pigeon-cli

@@ -27,7 +27,7 @@ module Pigeon
     desc "show", "Prints a base64 identiy string to STDOUT"
 
     def show
-      puts Pigeon::Storage.current.get_conf("public_key")
+      puts Pigeon::KeyPair.current.public_key
     end
   end
 

spec/pigeon/key_pair_spec.rb

@@ -4,10 +4,6 @@ RSpec.describe Pigeon::KeyPair do
   FAKE_SEED = "\x15\xB1\xA8\x1D\xE1\x1Cx\xF0" \
   "\xC6\xDCK\xDE\x9A\xB7>\x86o\x92\xEF\xB7\x17" \
   ")\xFF\x01E\b$b)\xC9\x82\b"
-  TO_H = {
-    private_key: "FbGoHeEcePDG3Evemrc-hm-S77cXKf8BRQgkYinJggg=",
-    public_key: "@7n_g0ca9FFWvMkXy2TMwM7bdMn6tNiEHKzrFX-CzAmQ=.ed25519",
-  }
   let(:kp) { Pigeon::KeyPair.new(FAKE_SEED) }
 
   it "generates a pair from a seed" do
@@ -28,14 +24,18 @@ RSpec.describe Pigeon::KeyPair do
     expect(result).to eq(whatever)
   end
 
-  it "converts to a Hash" do
-    expect(kp.to_h).to eq(TO_H)
-  end
-
   it "saves to disk" do
-    TO_H.to_a.map do |pair|
-      expect(Pigeon::Storage.current).to receive(:set_conf).with(*pair)
+    argss = [
+      Pigeon::KeyPair::SEED_CONFIG_KEY,
+      FAKE_SEED,
+    ]
+    FakeFS.with_fresh do
+      lol = receive(:set_conf).with(*argss).and_call_original
+      expect(Pigeon::Storage.current).to lol
+      kp.save!
+      new_kp = Pigeon::KeyPair.current
+      expect(new_kp.public_key).to eq(kp.public_key)
+      expect(new_kp.private_key).to eq(kp.private_key)
     end
-    kp.save!
   end
 end