Support serde for Monzo and YNAB transaction structs

Define transaction structs for both Monzo and YNAB. Each package has a `main`
function that runs some shallow but preliminary round-trip tests for the
serializers and decoders.

The fixtures.json file that each of them is referencing has been ignored in case
either contains confidential data of which I'm unaware.

.gitignore

@@ -26,3 +26,5 @@ Vundle.vim
 # Python
 __pycache__
 *.class
+/monzo_ynab/ynab/fixture.json
+/monzo_ynab/monzo/fixture.json

monzo_ynab/monzo/serde.go

@@ -0,0 +1,82 @@
+// This package hosts the serialization and deserialization logic for all of the
+// data types with which our application interacts from the Monzo API.
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"time"
+)
+
+type TxMetadata struct {
+	FasterPayment string `json:"faster_payment"`
+	FpsPaymentId  string `json:"fps_payment_id"`
+	Insertion     string `json:"insertion"`
+	Notes         string `json:"notes"`
+	Trn           string `json:"trn"`
+}
+
+type TxCounterparty struct {
+	AccountNumber string `json:"account_number"`
+	Name          string `json:"name"`
+	SortCode      string `json:"sort_code"`
+	UserId        string `json:"user_id"`
+}
+
+type Transaction struct {
+	Id                         string    `json:"id"`
+	Created                    time.Time `json:"created"`
+	Description                string    `json:"description"`
+	Amount                     int       `json:"amount"`
+	Currency                   string    `json:"currency"`
+	Notes                      string    `json:"notes"`
+	Metadata                   TxMetadata
+	AccountBalance             int            `json:"account_balance"`
+	International              interface{}    `json:"international"`
+	Category                   string         `json:"category"`
+	IsLoad                     bool           `json:"is_load"`
+	Settled                    time.Time      `json:"settled"`
+	LocalAmount                int            `json:"local_amount"`
+	LocalCurrency              string         `json:"local_currency"`
+	Updated                    time.Time      `json:"updated"`
+	AccountId                  string         `json:"account_id"`
+	UserId                     string         `json:"user_id"`
+	Counterparty               TxCounterparty `json:"counterparty"`
+	Scheme                     string         `json:"scheme"`
+	DedupeId                   string         `json:"dedupe_id"`
+	Originator                 bool           `json:"originator"`
+	IncludeInSpending          bool           `json:"include_in_spending"`
+	CanBeExcludedFromBreakdown bool           `json:"can_be_excluded_from_breakdown"`
+	CanBeMadeSubscription      bool           `json:"can_be_made_subscription"`
+	CanSplitTheBill            bool           `json:"can_split_the_bill"`
+	CanAddToTab                bool           `json:"can_add_to_tab"`
+	AmountIsPending            bool           `json:"amount_is_pending"`
+	// Fees interface{} `json:"fees"`
+	// Merchant interface `json:"merchant"`
+	// Labels interface{} `json:"labels"`
+	// Attachments interface{} `json:"attachments"`
+	// Categories interface{} `json:"categories"`
+}
+
+// Attempts to encode a Monzo transaction struct into a string.
+func serializeTx(tx *Transaction) (string, error) {
+	x, err := json.Marshal(tx)
+	return string(x), err
+}
+
+// Attempts to parse a string encoding a transaction presumably sent from a
+// Monzo server.
+func deserializeTx(x string) (*Transaction, error) {
+	target := &Transaction{}
+	err := json.Unmarshal([]byte(x), target)
+	return target, err
+}
+
+func main() {
+	b, _ := ioutil.ReadFile("./fixture.json")
+	tx := string(b)
+	target, _ := deserializeTx(tx)
+	out, _ := serializeTx(target)
+	fmt.Println(out)
+}

monzo_ynab/ynab/serde.go

@@ -0,0 +1,52 @@
+// This package hosts the serialization and deserialization logic for all of the
+// data types with which our application interacts from the YNAB API.
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"time"
+)
+
+type Transaction struct {
+	Id           string    `json:"id"`
+	Date         time.Time `json:"date"`
+	Amount       int       `json:"amount"`
+	Memo         string    `json:"memo"`
+	Cleared      string    `json:"cleared"`
+	Approved     bool      `json:"approved"`
+	FlagColor    string    `json:"flag_color"`
+	AccountId    string    `json:"account_id"`
+	AccountName  string    `json:"account_name"`
+	PayeeId      string    `json:"payeed_id"`
+	PayeeName    string    `json:"payee_name"`
+	CategoryId   string    `json:"category_id"`
+	CategoryName string    `json:"category_name"`
+	Deleted      bool      `json:"deleted"`
+	// TransferAccountId interface{} `json:"transfer_account_id"`
+	// TransferTransactionId interface{} `json:"transfer_transaction_id"`
+	// MatchedTransactionId interface{} `json:"matched_transaction_id"`
+	// ImportId interface{} `json:"import_id"`
+	// Subtransactions interface{} `json:"subtransactions"`
+}
+
+// Attempts to encode a YNAB transaction into a string.
+func serializeTx(tx *Transaction) (string, error) {
+	x, err := json.Marshal(tx)
+	return string(x), err
+}
+
+// Attempts to parse a string encoding a transaction presumably sent from a
+// YNAB server.
+func deserializeTx(x string) (*Transaction, error) {
+	target := &Transaction{}
+	err := json.Unmarshal([]byte(x), target)
+	return target, err
+}
+
+func main() {
+	target, _ := deserializeTx(tx)
+	out, _ := serializeTx(target)
+	fmt.Println(out)
+	fmt.Println(ynabOut)
+}