From 3c61cdce0799c3b5a8e1616c6c8bdb978ea83592 Mon Sep 17 00:00:00 2001
From: David Florness <david@florness.com>
Date: Wed, 17 Jun 2020 22:52:38 -0600
Subject: [PATCH] Start elections.json file to keep track of previous elections

This will be useful to rejoin elections when a connection is lost.
---
 config.go      | 46 ++++++++++++++++++++++++++++++++++++++++++
 config_test.go | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++
 go.mod         |  1 +
 go.sum         |  2 ++
 4 files changed, 103 insertions(+)
 create mode 100644 config.go
 create mode 100644 config_test.go

diff --git a/config.go b/config.go
new file mode 100644
index 0000000..768bfda
--- /dev/null
+++ b/config.go
@@ -0,0 +1,46 @@
+package main
+
+import (
+	"encoding/json"
+	"io"
+	"os"
+	"path"
+
+	"github.com/kyoh86/xdg"
+)
+
+// Used to decode an election in the JSON elections file, which will be a list
+// of these.
+type ElectionConfig struct{
+	ElectionKey string
+	// Our private key in base58. TODO: encrypt
+	PrivKey     string
+	// Our public key in base58. Kept in addition to the private key to
+	// check against when the private key is later encrypted
+	PubKey      string
+}
+
+// sees if we've participated in this election before and attempt to retrieve
+// the data we stored for it
+func resumeElectionMaybe(electionKey string) *Election {
+	root := path.Join(xdg.ConfigHome(), "tallyard")
+	file, err := os.OpenFile(path.Join(root, "elections.json"), os.O_RDONLY|os.O_CREATE, 0600)
+	if err != nil {
+		panic(err)
+	}
+	defer file.Close()
+
+	// TOOD: use
+	decodeElections(file)
+
+	return nil
+}
+
+func decodeElections(reader io.Reader) (electionConfigs []ElectionConfig) {
+	decoder := json.NewDecoder(reader)
+	err := decoder.Decode(&electionConfigs)
+	if err != nil {
+		panic(err)
+	}
+	return electionConfigs
+}
diff --git a/config_test.go b/config_test.go
new file mode 100644
index 0000000..3fd88fb
--- /dev/null
+++ b/config_test.go
@@ -0,0 +1,54 @@
+package main
+
+import (
+	"fmt"
+	"strings"
+	"testing"
+)
+
+var elections = [2]ElectionConfig{
+	{
+		ElectionKey: "DpgZ3EG8cyNAxrbGejTTUuJB6KkvKVGK9WEpQWDh6RLd0QmVitsctABm8xbadtkqU46WMLCjuAadUR2RAkjaPf7xz7X",
+		PrivKey:  "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",
+		PubKey:   "7ySHQR7YZJApfZRKds9hzzFypZo8s6WQyZqXCYVHRjug84TSqhdKgdVBhS3cZ6NYMfygyfPMvAgjnn2mp3c5dSME49opHiD3ioUaArqGqddyWf3gonWVfnjkTnMcdpGXvDt74uAYf2NrwsphN1MuBBX5NAoHtE5vTRMAiZL94KSg7qFNZM1PckSJfo4xJUD1JgmEMqBvavosjFoenhZv7FjLkXFJhHFGfF7KaK4Q62bUubYtgiR1bkYk1RtctkjUvnBW8YnSx1QFGrmA5qAz8ZUCRmeqgktvpYDR2bj3XFDUGmjqNG3N4QMikg2a6vquCuuT6kv5WefzUYncvijQLHx85z74F8wMZV5huUxQM3RS2aZgc89WvFjeP5Pkmv1bUqvdZ5n1Yi3U65b9KBCR9ycL",
+	},
+	{
+		ElectionKey: "Dmfo6renA9YKuTFdGL4iSP5fcHbxHG4Qc9XTHkBzdHPa0QmVjm2QACdwMYguMtMooDoLsiagyVfe7qwxpuzUmX1stTM",
+		PrivKey:  "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",
+		PubKey:   "7ySHQR7YZJApfZRKds9hzzFypZo8s6WQyZqXCYVHRjug84TSqhdKDnnZpz69WtL8kvTgtrjEF3GHmsfjgMSt2t7vYgU26qHZfCXPUhA9u93vkCXSG6ZLBWw8K2HxMWPR69LoWzCsfXnLnw9mbr64uHmEeP64PSidtyshApUS73ikt7KGMdk3twJLr7SZ8uaqw6DCvBd9po5tVtPZ9gS1NPG3vuavLfm2P9YT2LMzCf68bJmqzgiVpUxRemvpwppVP675C5m6ctDELBTvqwQ9dc8baG4ztZPehEeUhULG5JpgtMKayCYRNhQVKdENyWXfFYzpMJ27iMH3LT2dixjgXRkqh8PKFt1srJA4we6vCLx1yjDjJV7MELo9P9nkXbojjQLXnqa41bYYGMN4ChK1C78U",
+	},
+}
+
+func TestElectionConfigDecoding(t *testing.T) {
+	jsonStream := fmt.Sprintf(`
+	[{"ElectionKey": "%s",
+	  "PrivKey": "%s",
+	  "PubKey": "%s"},
+	 {"ElectionKey": "%s",
+	  "PrivKey": "%s",
+	  "PubKey": "%s"}]`,
+		elections[0].ElectionKey,
+		elections[0].PrivKey,
+		elections[0].PubKey,
+		elections[1].ElectionKey,
+		elections[1].PrivKey,
+		elections[1].PubKey,
+	)
+	electionConfigs := decodeElections(strings.NewReader(jsonStream))
+	switch {
+	case len(electionConfigs) != 2:
+		t.Fail()
+	case electionConfigs[0].ElectionKey != elections[0].ElectionKey:
+		t.Fail()
+	case electionConfigs[0].PrivKey != elections[0].PrivKey:
+		t.Fail()
+	case electionConfigs[0].PubKey != elections[0].PubKey:
+		t.Fail()
+	case electionConfigs[1].ElectionKey != elections[1].ElectionKey:
+		t.Fail()
+	case electionConfigs[1].PrivKey != elections[1].PrivKey:
+		t.Fail()
+	case electionConfigs[1].PubKey != elections[1].PubKey:
+		t.Fail()
+	}
+}
diff --git a/go.mod b/go.mod
index ab86823..f5f400a 100644
--- a/go.mod
+++ b/go.mod
@@ -5,6 +5,7 @@ go 1.13
 require (
 	github.com/cbergoon/merkletree v0.2.0
 	github.com/ipfs/go-log v1.0.2
+	github.com/kyoh86/xdg v1.2.0
 	github.com/libp2p/go-libp2p v0.6.1
 	github.com/libp2p/go-libp2p-core v0.5.0
 	github.com/libp2p/go-libp2p-discovery v0.2.0
diff --git a/go.sum b/go.sum
index 26f6d5d..63ccffc 100644
--- a/go.sum
+++ b/go.sum
@@ -148,6 +148,8 @@ github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORN
 github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
 github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
 github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
+github.com/kyoh86/xdg v1.2.0 h1:CERuT/ShdTDj+A2UaX3hQ3mOV369+Sj+wyn2nIRIIkI=
+github.com/kyoh86/xdg v1.2.0/go.mod h1:/mg8zwu1+qe76oTFUBnyS7rJzk7LLC0VGEzJyJ19DHs=
 github.com/libp2p/go-addr-util v0.0.1 h1:TpTQm9cXVRVSKsYbgQ7GKc3KbbHVTnbostgGaDEP+88=
 github.com/libp2p/go-addr-util v0.0.1/go.mod h1:4ac6O7n9rIAKB1dnd+s8IbbMXkt+oBpzX4/+RACcnlQ=
 github.com/libp2p/go-buffer-pool v0.0.1/go.mod h1:xtyIz9PMobb13WaxR6Zo1Pd1zXJKYg0a8KiIvDp3TzQ=
-- 
2.38.4