-
Notifications
You must be signed in to change notification settings - Fork 0
/
service.go
563 lines (543 loc) · 16.4 KB
/
service.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
package main
import (
"encoding/json"
"io/ioutil"
"math"
"net/http"
"sort"
"strings"
"github.com/aws/aws-sdk-go-v2/aws"
"github.com/aws/aws-sdk-go-v2/service/dynamodb"
"github.com/aws/aws-sdk-go-v2/service/dynamodb/dynamodbattribute"
"github.com/aws/aws-sdk-go-v2/service/dynamodb/expression"
"github.com/satori/go.uuid"
)
const (
bankUrl = "http://localhost:5002/api/v1/user/{email}/bank/{bankId}"
)
/*
Register a new User.
Hash the password before storing.
Return the created User record.
*/
func (u *User) Register() (*User, error) {
hashedPwd, err := boldlygo.AuthService().HashPwd(u.Pwd) // use the AuthSvc to hash the users password
if err != nil {
return nil, err
}
u.Pwd = *hashedPwd // set new hashed password on user
userMap, err := dynamodbattribute.MarshalMap(u) // marshal User to dynamodbattribute map
if err != nil {
return nil, err
}
// build item input request
input := &dynamodb.PutItemInput{
Item: userMap,
TableName: aws.String("Users"),
}
req := boldlygo.DynamoDbSvc().PutItemRequest(input) // save item to db
_, err = req.Send()
if err != nil {
return nil, err
}
return u, nil
}
/*
Authenticate a user by their email and password.
Attempt to find the user by the email.
- If the user is found; get their hashed password, use the AuthSvc to compare it to the passed in password:
- if the passwords match, generate a JWT and return
- If the passwords do not match, return an error
- If the user cannot be found, return an error
*/
func Authenticate(email, pwd string) Auth {
req := boldlygo.DynamoDbSvc().GetItemRequest(&dynamodb.GetItemInput{
TableName: aws.String("Users"),
Key: map[string]dynamodb.AttributeValue{
"email": {
S: aws.String(email),
},
},
}) // build the request to send to DynamoDB to find a unique user record by the email primary key
output, err := req.Send() // send the request to the DynamoDB service; get the output result
if err != nil {
return Auth{
Success: false,
Message: "Unable to find user by that email. Please check your email and try again",
}
}
if len(output.Item) == 0 {
return Auth{
Success: false,
Message: "Unable to find user by that email. Please check your email and try again",
}
}
// unmarshal returned map from DynamoDB into a User
var user = new(User)
err = dynamodbattribute.UnmarshalMap(output.Item, &user)
if err != nil {
return Auth{
Success: false,
Message: err.Error(),
}
}
// verify that the passed in password matches the saved password for the user
if verify := boldlygo.AuthService().VerifyPwd(user.Pwd, pwd); !verify {
return Auth{
Success: false,
Message: "The password submitted does not match this users password. Please check the email and password and try again",
}
}
token, expiry, err := boldlygo.AuthService().BuildToken(*user) // generate token from user
if err != nil {
return Auth{
Success: false,
Message: err.Error(),
}
}
return Auth{
Success: true,
Message: "Success",
Token: *token,
ExpiresAt: *expiry,
}
}
/*
Utilize the HTTP client to make a REST call to get the Bank info by its PK id
*/
func GetBank(email string, bankId uuid.UUID) (*Bank, error) {
url := strings.Replace(bankUrl, "{email}", email, -1) // replace email placeholder with passed in email
url = strings.Replace(url, "{bankId}", bankId.String(), -1) // replace bankId placeholder with passed in bankId
resp, err := http.Get(url)
if err != nil {
return nil, err
}
defer resp.Body.Close()
// get the response body and parse into Bank
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, err
}
var bank = new(Bank)
json.Unmarshal(body, &bank) // unmarshal the response body into a bank
return bank, nil
}
/*
Get a list of all of the users bank accounts by the bank id
*/
func GetUserBankAccounts(bankId uuid.UUID) ([]*BankAccount, error) {
keyCond := expression.Key("bankId").Equal(expression.Value(bankId.String())) // build find BankAccount by BankId filter expression
expr, err := expression.NewBuilder().
WithKeyCondition(keyCond).
Build()
if err != nil {
return nil, err
}
params := &dynamodb.QueryInput{
TableName: aws.String("BankAccounts"),
KeyConditionExpression: expr.KeyCondition(),
ExpressionAttributeValues: expr.Values(),
ExpressionAttributeNames: expr.Names(),
}
req := boldlygo.DynamoDbSvc().QueryRequest(params) // build dynamodb query with key condition
output, err := req.Send() // submit the dynamodb query request
if err != nil {
return nil, err
}
// unmarshal the return into the object
if output.Items == nil {
return nil, err
}
var accounts = make([]*BankAccount, 0)
err = dynamodbattribute.UnmarshalListOfMaps(output.Items, &accounts) // unmarshal the found items into a list of accounts
if err != nil {
return nil, err
}
return accounts, nil
}
/*
Get a unique BankAccount record by the Primary Key and Sort Key conditions
*/
func GetUserBankAccount(bankId, accountId uuid.UUID) (*BankAccount, error) {
req := boldlygo.DynamoDbSvc().GetItemRequest(&dynamodb.GetItemInput{
TableName: aws.String("BankAccounts"),
Key: map[string]dynamodb.AttributeValue{
"bankId": {
S: aws.String(bankId.String()),
},
"accountId": {
S: aws.String(accountId.String()),
},
},
})
output, err := req.Send()
if err != nil {
return nil, err
}
// unmarshal returned map into BankAccount
var account = new(BankAccount)
err = dynamodbattribute.UnmarshalMap(output.Item, &account)
if err != nil {
return nil, err
}
return account, nil
}
/*
Save a new BankAccount record to DynamoDB
*/
func (a *BankAccount) Save() (*BankAccount, error) {
a.AccountId = uuid.NewV4().String() // set unique account id
acctMap, err := dynamodbattribute.MarshalMap(a) // marshal BankAccount to dynamodbattribute map
if err != nil {
return nil, err
}
// build item input request
input := &dynamodb.PutItemInput{
Item: acctMap,
TableName: aws.String("BankAccounts"),
}
// save item to db
req := boldlygo.DynamoDbSvc().PutItemRequest(input)
_, err = req.Send()
if err != nil {
return nil, err
}
return a, nil
}
/*
Update a BankAccount record in DynamoDB
*/
func (a *BankAccount) Update() (*BankAccount, error) {
// Build Update expression to set which fields should be updated
update := expression.
Set(expression.Name("accountName"), expression.Value(a.AccountName)).
Set(expression.Name("accountType"), expression.Value(a.AccountType)).
Set(expression.Name("last4"), expression.Value(a.Last4)).
Set(expression.Name("currentBalance"), expression.Value(a.CurrentBalance))
// build update expression with update fields set
expr, err := expression.NewBuilder().
WithUpdate(update).
Build()
if err != nil {
return nil, err
}
// build update BankAccount item input
input := &dynamodb.UpdateItemInput{
TableName: aws.String("BankAccounts"),
Key: map[string]dynamodb.AttributeValue{
"bankId": {
S: aws.String(a.BankId),
},
"accountId": {
S: aws.String(a.AccountId),
},
},
ExpressionAttributeNames: expr.Names(),
ExpressionAttributeValues: expr.Values(),
ReturnValues: dynamodb.ReturnValueNone,
UpdateExpression: expr.Update(),
}
req := boldlygo.DynamoDbSvc().UpdateItemRequest(input) // build update item request
_, err = req.Send() // send update item request; expect nothing back
if err != nil {
return nil, err
}
return a, nil // return BankAccount
}
/*
Update a BankAccount record in DynamoDB.
Update the CurrentBalance as the result of a Transaction occurring on the BankAccount
*/
func (a *BankAccount) UpdateCurrentBalance(txnAmount float64, txnType string) error {
// calculate the new Current Balance
currBalance := a.CurrentBalance
if txnType == "CREDIT" {
txnAmount = math.Abs(txnAmount) * -1 // if transaction type is CREDIT, it needs to subtracted from the current balance of the BankAccount
}
currBalance += txnAmount
// Build Update expression to set which fields should be updated
update := expression.Set(expression.Name("currentBalance"), expression.Value(currBalance))
// build update expression with update fields set
expr, err := expression.NewBuilder().
WithUpdate(update).
Build()
if err != nil {
return err
}
// build update BankAccount item input
input := &dynamodb.UpdateItemInput{
TableName: aws.String("BankAccounts"),
Key: map[string]dynamodb.AttributeValue{
"bankId": {
S: aws.String(a.BankId),
},
"accountId": {
S: aws.String(a.AccountId),
},
},
ExpressionAttributeNames: expr.Names(),
ExpressionAttributeValues: expr.Values(),
ReturnValues: dynamodb.ReturnValueNone,
UpdateExpression: expr.Update(),
}
req := boldlygo.DynamoDbSvc().UpdateItemRequest(input) // build update item request
_, err = req.Send() // send update item request; expect nothing back
if err != nil {
return err
}
return nil
}
/*
Get a list of Cards associated to the BankAccount
*/
func GetAccountCards(accountId uuid.UUID) ([]*Card, error) {
keyCond := expression.Key("accountId").Equal(expression.Value(accountId.String())) // build find Card records by AccountId filter expression
expr, err := expression.NewBuilder().
WithKeyCondition(keyCond).
Build()
if err != nil {
return nil, err
}
params := &dynamodb.QueryInput{
TableName: aws.String("Cards"),
KeyConditionExpression: expr.KeyCondition(),
ExpressionAttributeValues: expr.Values(),
ExpressionAttributeNames: expr.Names(),
}
req := boldlygo.DynamoDbSvc().QueryRequest(params) // build dynamodb query with key condition
output, err := req.Send() // submit the dynamodb query request
if err != nil {
return nil, err
}
// unmarshal the return into the object
if output.Items == nil {
return nil, err
}
var cards = make([]*Card, 0)
err = dynamodbattribute.UnmarshalListOfMaps(output.Items, &cards) // unmarshal the found items into a list of cards
if err != nil {
return nil, err
}
return cards, nil
}
/*
Find a unique Card record by the accountId, cardId composite key
*/
func GetAccountCard(accountId, cardId uuid.UUID) (*Card, error) {
req := boldlygo.DynamoDbSvc().GetItemRequest(&dynamodb.GetItemInput{
TableName: aws.String("Cards"),
Key: map[string]dynamodb.AttributeValue{
"accountId": {
S: aws.String(accountId.String()),
},
"cardId": {
S: aws.String(cardId.String()),
},
},
})
output, err := req.Send()
if err != nil {
return nil, err
}
// unmarshal returned map into Card
var card = new(Card)
err = dynamodbattribute.UnmarshalMap(output.Item, &card)
if err != nil {
return nil, err
}
return card, nil
}
/*
Find the Card record associated to the BankAccount that is marked as Active
*/
func GetActiveAccountCard(accountId uuid.UUID) (*Card, error) {
filter := expression.
Name("accountId").Equal(expression.Value(accountId.String())).
And(expression.Name("active").Equal(expression.Value(true))) // build filter for account id and active true
expr, err := expression.NewBuilder().
WithFilter(filter).
Build()
if err != nil {
return nil, err
}
params := &dynamodb.ScanInput{
TableName: aws.String("Cards"),
FilterExpression: expr.Filter(),
ExpressionAttributeValues: expr.Values(),
ExpressionAttributeNames: expr.Names(),
}
req := boldlygo.DynamoDbSvc().ScanRequest(params) // build dynamodb query with key condition
output, err := req.Send() // submit the dynamodb query request
if err != nil {
return nil, err
}
// unmarshal the return into the object
if output.Items == nil || len(output.Items) == 0 {
return nil, err
}
var cards = make([]*Card, 0)
err = dynamodbattribute.UnmarshalListOfMaps(output.Items, &cards) // unmarshal the found items into a list of cards
if err != nil {
return nil, err
}
return cards[0], nil
}
/*
Save a Card record
*/
func (c *Card) Save() (*Card, error) {
c.CardId = uuid.NewV4().String() // set unique card id
cardMap, err := dynamodbattribute.MarshalMap(c) // marshal Card to dynamodbattribute map
if err != nil {
return nil, err
}
// build item input request
input := &dynamodb.PutItemInput{
Item: cardMap,
TableName: aws.String("Cards"),
}
// save item to db
req := boldlygo.DynamoDbSvc().PutItemRequest(input)
_, err = req.Send()
if err != nil {
return nil, err
}
return c, nil
}
/*
Update an existing Card record
*/
func (c *Card) Inactivate() (*Card, error) {
// Set the active field on the card to false
update := expression.Set(expression.Name("active"), expression.Value(false))
// build update expression with update fields set
expr, err := expression.NewBuilder().
WithUpdate(update).
Build()
if err != nil {
return nil, err
}
// build update BankAccount item input
input := &dynamodb.UpdateItemInput{
TableName: aws.String("Cards"),
Key: map[string]dynamodb.AttributeValue{
"accountId": {
S: aws.String(c.AccountId),
},
"cardId": {
S: aws.String(c.CardId),
},
},
ExpressionAttributeNames: expr.Names(),
ExpressionAttributeValues: expr.Values(),
ReturnValues: dynamodb.ReturnValueNone,
UpdateExpression: expr.Update(),
}
req := boldlygo.DynamoDbSvc().UpdateItemRequest(input) // build update item request
_, err = req.Send() // send update item request; expect nothing back
if err != nil {
return nil, err
}
return c, nil // return Card
}
/*
Get a list of all Transactions associated to the BankAccount
*/
func GetAccountTransactions(accountId uuid.UUID) ([]*Transaction, error) {
keyCond := expression.Key("accountId").Equal(expression.Value(accountId.String())) // build find Transaction records by AccountId filter expression
expr, err := expression.NewBuilder().
WithKeyCondition(keyCond).
Build()
if err != nil {
return nil, err
}
params := &dynamodb.QueryInput{
TableName: aws.String("Transactions"),
KeyConditionExpression: expr.KeyCondition(),
ExpressionAttributeValues: expr.Values(),
ExpressionAttributeNames: expr.Names(),
}
req := boldlygo.DynamoDbSvc().QueryRequest(params) // build dynamodb query with key condition
output, err := req.Send() // submit the dynamodb query request
if err != nil {
return nil, err
}
// unmarshal the return into the object
if output.Items == nil {
return nil, err
}
var transactions = make([]*Transaction, 0)
err = dynamodbattribute.UnmarshalListOfMaps(output.Items, &transactions) // unmarshal the found items into a list of transactions
if err != nil {
return nil, err
}
sort.Slice(transactions, func(i, j int) bool {
return transactions[i].TransactionDate.Before(transactions[j].TransactionDate)
})
return transactions, nil
}
/*
Find a unique BankAccount Transaction record by the accountId and transactionId composite key
*/
func GetAccountTransaction(accountId, transactionId uuid.UUID) (*Transaction, error) {
req := boldlygo.DynamoDbSvc().GetItemRequest(&dynamodb.GetItemInput{
TableName: aws.String("Transactions"),
Key: map[string]dynamodb.AttributeValue{
"accountId": {
S: aws.String(accountId.String()),
},
"transactionId": {
S: aws.String(transactionId.String()),
},
},
})
output, err := req.Send()
if err != nil {
return nil, err
}
// unmarshal returned map into Transaction
var txn = new(Transaction)
err = dynamodbattribute.UnmarshalMap(output.Item, &txn)
if err != nil {
return nil, err
}
return txn, nil
}
/*
Save a Transaction to the BankAccount.
Update the CurrentBalance on the BankAccount as a result of the Transaction
*/
func (t *Transaction) Save(bankId uuid.UUID) (*Transaction, error) {
t.TransactionId = uuid.NewV4().String() // set unique transaction id
txnMap, err := dynamodbattribute.MarshalMap(t) // marshal Transaction to dynamodbattribute map
if err != nil {
return nil, err
}
// build item input request
input := &dynamodb.PutItemInput{
Item: txnMap,
TableName: aws.String("Transactions"),
}
// save item to db
req := boldlygo.DynamoDbSvc().PutItemRequest(input)
_, err = req.Send()
if err != nil {
return nil, err
}
// update the current balance of the BankAccount
acctId, err := uuid.FromString(t.AccountId)
if err != nil {
return nil, err
}
// get the BankAccount record
bankAccount, err := GetUserBankAccount(bankId, acctId)
if err != nil {
return nil, err
}
err = bankAccount.UpdateCurrentBalance(t.Amount, t.TransactionType)
if err != nil {
return nil, err
}
// return the Transaction
return t, nil
}