├── .gitignore ├── LICENSE ├── README.md └── gateway ├── constant └── PaymentOperation.go ├── database.go ├── dto ├── AccountRequestDto.go ├── AccountResponseDto.go ├── AuthorizationRequestDto.go ├── PaymentResponseDto.go └── SuccessiveRequestDto.go ├── main.go ├── model ├── Account.go └── Payment.go └── router.go /.gitignore: -------------------------------------------------------------------------------- 1 | # Binaries for programs and plugins 2 | *.exe 3 | *.exe~ 4 | *.dll 5 | *.so 6 | *.dylib 7 | 8 | # Test binary, build with `go test -c` 9 | *.test 10 | 11 | # Output of the go coverage tool, specifically when used with LiteIDE 12 | *.out 13 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU AFFERO GENERAL PUBLIC LICENSE 2 | Version 3, 19 November 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU Affero General Public License is a free, copyleft license for 11 | software and other kinds of works, specifically designed to ensure 12 | cooperation with the community in the case of network server software. 13 | 14 | The licenses for most software and other practical works are designed 15 | to take away your freedom to share and change the works. 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It is safest 628 | to attach them to the start of each source file to most effectively 629 | state the exclusion of warranty; and each file should have at least 630 | the "copyright" line and a pointer to where the full notice is found. 631 | 632 | 633 | Copyright (C) 634 | 635 | This program is free software: you can redistribute it and/or modify 636 | it under the terms of the GNU Affero General Public License as published 637 | by the Free Software Foundation, either version 3 of the License, or 638 | (at your option) any later version. 639 | 640 | This program is distributed in the hope that it will be useful, 641 | but WITHOUT ANY WARRANTY; without even the implied warranty of 642 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 643 | GNU Affero General Public License for more details. 644 | 645 | You should have received a copy of the GNU Affero General Public License 646 | along with this program. If not, see . 647 | 648 | Also add information on how to contact you by electronic and paper mail. 649 | 650 | If your software can interact with users remotely through a computer 651 | network, you should also make sure that it provides a way for users to 652 | get its source. For example, if your program is a web application, its 653 | interface could display a "Source" link that leads users to an archive 654 | of the code. There are many ways you could offer source, and different 655 | solutions will be better for different programs; see section 13 for the 656 | specific requirements. 657 | 658 | You should also get your employer (if you work as a programmer) or school, 659 | if any, to sign a "copyright disclaimer" for the program, if necessary. 660 | For more information on this, and how to apply and follow the GNU AGPL, see 661 | . 662 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Payment Gateway Golang Example 2 | 3 | In our simplified model of a prepaid card the card holds a balance in GBP and users can make 4 | transactions in GBP. To be able to use the card the user must first load some money onto the 5 | card. This increases the available balance on the card. When a user goes and makes a 6 | transaction using the card, the merchant (e.g your local independent coffee shop) sends the 7 | card an Authorization request to check if the user loaded enough money on the account to 8 | pay for their coffee. 9 | 10 | If the user has loaded enough, the Authorization request is approved and 11 | the amount the merchant requested is earmarked (or blocked). The merchant at a later point in 12 | the future can decide to Capture ​the transaction at which point we send the merchant the 13 | money. At any point the user should be able to see how much he loaded onto the card, the 14 | current available balance, and the current amount that is blocked on there (waiting to be 15 | captured). 16 | 17 | The merchant can decide to only capture part of the amount or capture the amount multiple 18 | times. In this model, the merchant can’t capture more than we initially authorized him to. The 19 | merchant can decide to reverse the whole or part of the initial Authorization at which point they 20 | can no longer capture the full amount (only the amount that is still authorized). The merchant 21 | can Refund ​the user after they capture the funds. They can’t refund the user more than they 22 | captured. The user can then use the refunded amount to buy more coffee. 23 | 24 | ## Getting Started 25 | 26 | These instructions will get you a copy of the project up and running on your local machine for development and testing purposes. See deployment for notes on how to deploy the project on a live system. 27 | 28 | ### Prerequisites 29 | 30 | What things you need to install the software and how to install them 31 | 32 | ``` 33 | https://golang.org/doc/install 34 | ``` 35 | 36 | ### Installing 37 | 38 | A step by step series of examples that tell you how to get a development env running 39 | 40 | Download the GO Project 41 | 42 | ``` 43 | https://github.com/angelospillos/gateway.git 44 | ``` 45 | 46 | Place the gateway folder in the MAIN GoPath src to look like 47 | 48 | ``` 49 | go/src/gateway/main.go 50 | ``` 51 | 52 | Then use the following command to run it 53 | 54 | ``` 55 | go run *.go 56 | ``` 57 | 58 | ## Running the tests 59 | 60 | Do to time constrains there are no automated tests for this system 61 | but you can use the following endpoints to test the system 62 | 63 | ### Accounts Create 64 | It will generate a random Account. 65 | 66 | Endpoint 67 | 68 | ``` 69 | GET http://127.0.0.1:8000/v1/accounts/create 70 | ``` 71 | 72 | Response 73 | 74 | ``` 75 | { 76 | "id": "4666336021280850", 77 | "available": 0, 78 | "blocked": 0, 79 | "deposited": 0, 80 | "withdrawn": 0, 81 | "currency": "GBP", 82 | "card_name": "Mr Payment", 83 | "card_type": "VISA", 84 | "card_number": 4666336021280850, 85 | "card_expiry_month": 2, 86 | "card_expiry_year": 23, 87 | "card_security_code": 547, 88 | "statement": null, 89 | "creation_time": "2018-07-02T00:31:04.673878069+03:00" 90 | } 91 | ``` 92 | 93 | ### Accounts Deposit 94 | 95 | Use the the Id of an Account to deposit. 96 | 97 | Request 98 | 99 | ``` 100 | { 101 | "id" : "4666336021280850", 102 | "amount":1000 103 | } 104 | ``` 105 | 106 | Endpoint 107 | 108 | ``` 109 | POST http://127.0.0.1:8000/v1/accounts/deposit 110 | ``` 111 | 112 | Response 113 | ``` 114 | { 115 | "account_id": "4666336021280850", 116 | "status": "0", 117 | "description": "Approved" 118 | } 119 | ``` 120 | 121 | ### Accounts Detail 122 | 123 | Details of the Current Account 124 | 125 | Request 126 | 127 | ``` 128 | 129 | { 130 | "id" : "4666677990633308" 131 | } 132 | 133 | ``` 134 | 135 | Endpoint 136 | 137 | ``` 138 | http://127.0.0.1:8000/v1/accounts/detail 139 | ``` 140 | 141 | Response 142 | ``` 143 | { 144 | "id": "", 145 | "available": 0, 146 | "blocked": 0, 147 | "deposited": 0, 148 | "withdrawn": 0, 149 | "currency": "", 150 | "card_name": "", 151 | "card_type": "", 152 | "card_number": 0, 153 | "card_expiry_month": 0, 154 | "card_expiry_year": 0, 155 | "card_security_code": 0, 156 | "statement": null, 157 | "creation_time": "0001-01-01T00:00:00Z" 158 | } 159 | ``` 160 | 161 | ### Accounts Statement 162 | 163 | A list of all payments involved with the current Account 164 | 165 | Request 166 | ``` 167 | { 168 | "id" : "4666744292130045" 169 | } 170 | ``` 171 | 172 | Endpoint 173 | ``` 174 | http://127.0.0.1:8000/v1/accounts/statement 175 | ``` 176 | 177 | Response 178 | ``` 179 | { 180 | "statement": [{}] 181 | } 182 | ``` 183 | 184 | ### Payments Authorization 185 | 186 | Authorization is the first point of entry to start working with payment operations. 187 | Once an authorization is successful you can execute successive operations. 188 | 189 | 190 | Headers 191 | ``` 192 | From 4666557263649072 193 | Content-Type application/json 194 | ``` 195 | 196 | Request 197 | ``` 198 | { 199 | "orderId" : "123", 200 | "amount":900, 201 | "currency":"GBP", 202 | "card_name":"Mr Payment", 203 | "card_number":4666677990633308, 204 | "card_expiry_month": 10, 205 | "card_expiry_year" : 19, 206 | "card_security_code" : 916 207 | } 208 | ``` 209 | 210 | Endpoint 211 | 212 | ``` 213 | POST http://127.0.0.1:8000/v1/payments/authorization 214 | 215 | ``` 216 | 217 | Response 218 | ``` 219 | { 220 | "referenceId": "9da2df89-f0e4-406d-ac0d-d7670607e306", 221 | "status": "0", 222 | "description": "Approved" 223 | } 224 | ``` 225 | 226 | ### Successive Requests 227 | Headers 228 | ``` 229 | From 4666557263649072 // Account Id to get the money 230 | Content-Type application/json 231 | ``` 232 | 233 | Example Request 234 | ``` 235 | { 236 | "orderId" : "123", 237 | "amount":50 238 | } 239 | ``` 240 | 241 | Endpoint 242 | ``` 243 | http://127.0.0.1:8000/v1/payments/capture/{authorization_id} 244 | http://127.0.0.1:8000/v1/payments/reversal/{authorization_id} 245 | http://127.0.0.1:8000/v1/payments/refund/{capture_id} 246 | ``` 247 | 248 | Example Response 249 | ``` 250 | { 251 | "referenceId": "ee1a3371-1781-4de9-bf7c-f72394c811ba", 252 | "status": "0", 253 | "description": "Approved" 254 | } 255 | ``` 256 | 257 | ## Deployment 258 | 259 | To Deploy this on a live system follow http://www.blog.labouardy.com/deploying-go-app-to-aws-ec2/ 260 | 261 | ## Built With 262 | 263 | * [Golang](https://golang.org/) - The Go Programming Language. 264 | * [MUX](https://github.com/gorilla/mux) - A powerful URL router and dispatcher for golang. 265 | * [BoltDb](https://github.com/boltdb/bolt) - An embedded key/value database for Go. 266 | 267 | ## Versioning 268 | 269 | For the versions available, see the [tags on this repository](https://github.com/angelospillos/gateway/tags). 270 | 271 | ## Authors 272 | 273 | * **Angelos Pillos** - (https://www.angelospillos.com) 274 | 275 | See also the list of [contributors](https://github.com/angelospillos/gateway/graphs/contributors) who participated in this project. 276 | 277 | ## License 278 | 279 | This project is licensed under the GNU Affero General Public License v3.0 - see the [LICENSE.md](LICENSE.md) file for details 280 | 281 | ## Acknowledgments 282 | 283 | * Special thanks for the inspiration to Curve (https://www.imaginecurve.com/) 284 | -------------------------------------------------------------------------------- /gateway/constant/PaymentOperation.go: -------------------------------------------------------------------------------- 1 | package constant 2 | 3 | const ( 4 | AUTHORIZATION = "AUTHORIZATION" 5 | CAPTURE = "CAPTURE" 6 | REVERSAL = "REVERSAL" 7 | REFUND = "REFUND" 8 | ) 9 | -------------------------------------------------------------------------------- /gateway/database.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "github.com/boltdb/bolt" 5 | "fmt" 6 | "time" 7 | "gateway/model" 8 | "encoding/json" 9 | ) 10 | 11 | var rootBucket = []byte("DB") 12 | var accountBucket = []byte("ACCOUNT") 13 | var paymentBucket = []byte("PAYMENT") 14 | var businessStatementBucket = []byte("BUSINESS_STATEMENT") 15 | var personalStatementBucket = []byte("PERSONAL_STATEMENT") 16 | 17 | func setupDB() (*bolt.DB, error) { 18 | db, err := bolt.Open("main.db", 0600, &bolt.Options{Timeout: 1 * time.Second}) 19 | if err != nil { 20 | return nil, fmt.Errorf("could not open db, %v", err) 21 | } 22 | err = db.Update(func(tx *bolt.Tx) error { 23 | root, err := tx.CreateBucketIfNotExists(rootBucket) 24 | if err != nil { 25 | return fmt.Errorf("could not create root bucket: %v", err) 26 | } 27 | _, err = root.CreateBucketIfNotExists(accountBucket) 28 | if err != nil { 29 | return fmt.Errorf("could not create Account bucket: %v", err) 30 | } 31 | _, err = root.CreateBucketIfNotExists(paymentBucket) 32 | if err != nil { 33 | return fmt.Errorf("could not create Payment bucket: %v", err) 34 | } 35 | return nil 36 | }) 37 | if err != nil { 38 | return nil, fmt.Errorf("could not set up buckets, %v", err) 39 | } 40 | fmt.Println("DB Setup Done") 41 | return db, nil 42 | } 43 | 44 | func saveAccount(db *bolt.DB, account model.Account) error { 45 | 46 | var key = fmt.Sprintf("%v", account.Id) 47 | var value, err = json.Marshal(account) 48 | 49 | if err != nil { 50 | return fmt.Errorf("could not json marshal entry: %v", err) 51 | } 52 | 53 | err = db.Update(func(tx *bolt.Tx) error { 54 | err := tx.Bucket(rootBucket).Bucket(accountBucket).Put([]byte(key), []byte(value)) 55 | if err != nil { 56 | return fmt.Errorf("could not insert entry: %v", err) 57 | } 58 | 59 | return nil 60 | }) 61 | 62 | fmt.Println("Added Account Entry " + account.Id) 63 | 64 | return err 65 | } 66 | 67 | func getAccount(db *bolt.DB, id string) (model.Account, error) { 68 | 69 | var account model.Account 70 | var key = []byte(id) 71 | 72 | err := db.View(func(tx *bolt.Tx) error { 73 | value := tx.Bucket(rootBucket).Bucket(accountBucket).Get(key) 74 | fmt.Sprintf("Found Account Entry %s", value) 75 | return json.Unmarshal(value, &account) 76 | }) 77 | 78 | if err != nil { 79 | fmt.Printf("Could not get Account ID %s", id) 80 | return account, nil 81 | } 82 | 83 | return account, nil 84 | } 85 | 86 | func savePayment(db *bolt.DB, payment model.Payment) error { 87 | 88 | var key = fmt.Sprintf("%v", payment.Id) 89 | 90 | var value, err = json.Marshal(payment) 91 | 92 | if err != nil { 93 | return fmt.Errorf("could not json marshal entry: %v", err) 94 | } 95 | 96 | err = db.Update(func(tx *bolt.Tx) error { 97 | err := tx.Bucket(rootBucket).Bucket(paymentBucket).Put([]byte(key), []byte(value)) 98 | if err != nil { 99 | return fmt.Errorf("could not insert payment entry: %v", err) 100 | } 101 | 102 | return nil 103 | }) 104 | 105 | fmt.Println("Added Payment Entry " + key) 106 | 107 | return err 108 | } 109 | 110 | func getPayment(db *bolt.DB, id string) (model.Payment, error) { 111 | 112 | var key = []byte(id) 113 | var payment model.Payment 114 | 115 | err := db.View(func(tx *bolt.Tx) error { 116 | value := tx.Bucket(rootBucket).Bucket(paymentBucket).Get(key) 117 | fmt.Sprintf("Found Payment Entry %s", value) 118 | return json.Unmarshal(value, &payment) 119 | }) 120 | 121 | if err != nil { 122 | fmt.Printf("Could not get Payment ID %s", id) 123 | return payment, nil 124 | } 125 | 126 | return payment, nil 127 | } 128 | -------------------------------------------------------------------------------- /gateway/dto/AccountRequestDto.go: -------------------------------------------------------------------------------- 1 | package dto 2 | 3 | type AccountRequestDto struct { 4 | Id string `json:"id"` 5 | Amount int64 `json:"amount"` 6 | } 7 | -------------------------------------------------------------------------------- /gateway/dto/AccountResponseDto.go: -------------------------------------------------------------------------------- 1 | package dto 2 | 3 | type AccountResponseDto struct { 4 | AccountId string `json:"account_id"` 5 | Status string `json:"status"` 6 | Description string `json:"description"` 7 | } 8 | 9 | func CreateAccountResponseDto(accountId string, status string, description string) AccountResponseDto { 10 | 11 | var accountResponseDto AccountResponseDto 12 | 13 | accountResponseDto.AccountId = accountId 14 | accountResponseDto.Status = status 15 | accountResponseDto.Description = description 16 | 17 | return accountResponseDto 18 | } 19 | -------------------------------------------------------------------------------- /gateway/dto/AuthorizationRequestDto.go: -------------------------------------------------------------------------------- 1 | package dto 2 | 3 | type AuthorizationRequestDto struct { 4 | OrderId string `json:"orderId"` 5 | Amount int64 `json:"amount"` 6 | Currency string `json:"currency"` 7 | CardName string `json:"card_name"` 8 | CardNumber int `json:"card_number"` 9 | CardExpiryMonth int `json:"card_expiry_month"` 10 | CardExpiryYear int `json:"card_expiry_year"` 11 | CardSecurityCode int `json:"card_security_code"` 12 | } 13 | -------------------------------------------------------------------------------- /gateway/dto/PaymentResponseDto.go: -------------------------------------------------------------------------------- 1 | package dto 2 | 3 | type PaymentResponseDto struct { 4 | ReferenceId string `json:"referenceId"` 5 | Status string `json:"status"` 6 | Description string `json:"description"` 7 | } 8 | 9 | func CreatePaymentResponseDto(referenceId string, status string, description string) PaymentResponseDto { 10 | var paymentResponseDto PaymentResponseDto 11 | paymentResponseDto.ReferenceId = referenceId 12 | paymentResponseDto.Status = status 13 | paymentResponseDto.Description = description 14 | return paymentResponseDto 15 | } 16 | -------------------------------------------------------------------------------- /gateway/dto/SuccessiveRequestDto.go: -------------------------------------------------------------------------------- 1 | package dto 2 | 3 | type SuccessiveRequestDto struct { 4 | OrderId string `json:"orderId"` 5 | ReferenceId string `json:"referenceId"` 6 | Type string `json:"type"` 7 | Amount int64 `json:"amount"` 8 | } 9 | -------------------------------------------------------------------------------- /gateway/main.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "log" 5 | "net/http" 6 | "time" 7 | ) 8 | 9 | func main() { 10 | 11 | // Database Configuration 12 | db, err := setupDB() 13 | if err != nil { 14 | log.Fatal(err) 15 | } 16 | defer db.Close() 17 | 18 | // Routes Configuration 19 | router := setupRouter(db) 20 | 21 | // Server Configuration 22 | srv := &http.Server{ 23 | Handler: router, 24 | Addr: "127.0.0.1:8000", 25 | WriteTimeout: 15 * time.Second, 26 | ReadTimeout: 15 * time.Second, 27 | } 28 | 29 | log.Fatal(srv.ListenAndServe()) 30 | } 31 | -------------------------------------------------------------------------------- /gateway/model/Account.go: -------------------------------------------------------------------------------- 1 | package model 2 | 3 | import ( 4 | "time" 5 | "math/rand" 6 | "fmt" 7 | ) 8 | 9 | type Account struct { 10 | Id string `json:"id"` 11 | Available int64 `json:"available"` 12 | Blocked int64 `json:"blocked"` 13 | Deposited int64 `json:"deposited"` 14 | Withdrawn int64 `json:"withdrawn"` 15 | Currency string `json:"currency"` 16 | CardName string `json:"card_name"` 17 | CardType string `json:"card_type"` 18 | CardNumber int `json:"card_number"` 19 | CardExpiryMonth int `json:"card_expiry_month"` 20 | CardExpiryYear int `json:"card_expiry_year"` 21 | CardSecurityCode int `json:"card_security_code"` 22 | Statement []string `json:"statement"` 23 | CreationTime time.Time `json:"creation_time"` 24 | } 25 | 26 | func GenerateAccount() Account { 27 | 28 | var identifier = rand.Intn(4666778181156223-4666000000000000) + 4666000000000000 29 | var account Account 30 | 31 | account.Id = fmt.Sprintf("%v", identifier) 32 | account.Available = 0 33 | account.Blocked = 0 34 | account.Deposited = 0 35 | account.Withdrawn = 0 36 | account.Currency = "GBP" 37 | account.CardName = "Mr Payment" 38 | account.CardType = "VISA" 39 | account.CardNumber = identifier 40 | account.CardExpiryMonth = rand.Intn(12-1) + 1 41 | account.CardExpiryYear = rand.Intn(24-18) + 18 42 | account.CardSecurityCode = rand.Intn(999-100) + 100 43 | account.CreationTime = time.Now() 44 | 45 | return account 46 | } 47 | 48 | type AccountStatementDto struct { 49 | Statement []Payment `json:"statement"` 50 | } 51 | -------------------------------------------------------------------------------- /gateway/model/Payment.go: -------------------------------------------------------------------------------- 1 | package model 2 | 3 | import ( 4 | "time" 5 | "gateway/dto" 6 | "gateway/constant" 7 | "github.com/google/uuid" 8 | ) 9 | 10 | type Payment struct { 11 | Id string `json:"id"` 12 | BusinessId string `json:"businessId"` 13 | OrderId string `json:"order_id"` 14 | Operation string `json:"operation"` 15 | OriginalAmount int64 `json:"originalAmount"` 16 | CurrentAmount int64 `json:"currentAmount"` 17 | Status string `json:"status"` 18 | Description string `json:"description"` 19 | Currency string `json:"currency"` 20 | CardName string `json:"card_name"` 21 | CardType string `json:"card_type"` 22 | CardNumber int `json:"card_number"` 23 | CardExpiryMonth int `json:"card_expiry_month"` 24 | CardExpiryYear int `json:"card_expiry_year"` 25 | CreationTime time.Time `json:"creation_time"` 26 | } 27 | 28 | func CreateAuthorizationPayment(authorizationRequestDto dto.AuthorizationRequestDto, 29 | personalAccount Account, 30 | businessAccount Account, 31 | status string, 32 | description string) Payment { 33 | 34 | var payment Payment 35 | 36 | payment.Id = uuid.New().String() 37 | payment.BusinessId = businessAccount.Id 38 | payment.OrderId = authorizationRequestDto.OrderId 39 | payment.Operation = constant.AUTHORIZATION 40 | payment.OriginalAmount = authorizationRequestDto.Amount 41 | payment.CurrentAmount = authorizationRequestDto.Amount 42 | payment.Status = status 43 | payment.Description = description 44 | payment.Currency = authorizationRequestDto.Currency 45 | payment.CardName = authorizationRequestDto.CardName 46 | payment.CardType = personalAccount.CardType 47 | payment.CardNumber = personalAccount.CardNumber 48 | payment.CardExpiryMonth = personalAccount.CardExpiryMonth 49 | payment.CardExpiryYear = personalAccount.CardExpiryYear 50 | payment.CreationTime = time.Now() 51 | 52 | return payment 53 | } 54 | 55 | func CreateSuccessivePayment(successiveRequestDto dto.SuccessiveRequestDto, 56 | referencedPayment Payment, 57 | status string, 58 | description string) Payment { 59 | 60 | var successivePayment Payment 61 | 62 | successivePayment.Id = uuid.New().String() 63 | successivePayment.BusinessId = referencedPayment.BusinessId 64 | successivePayment.OrderId = successiveRequestDto.OrderId 65 | successivePayment.Operation = successiveRequestDto.Type 66 | successivePayment.OriginalAmount = successiveRequestDto.Amount 67 | successivePayment.CurrentAmount = successiveRequestDto.Amount 68 | successivePayment.Status = status 69 | successivePayment.Description = description 70 | successivePayment.Currency = referencedPayment.Currency 71 | successivePayment.CardName = referencedPayment.CardName 72 | successivePayment.CardType = referencedPayment.CardType 73 | successivePayment.CardNumber = referencedPayment.CardNumber 74 | successivePayment.CardExpiryMonth = referencedPayment.CardExpiryMonth 75 | successivePayment.CardExpiryYear = referencedPayment.CardExpiryYear 76 | successivePayment.CreationTime = time.Now() 77 | 78 | return successivePayment 79 | } 80 | -------------------------------------------------------------------------------- /gateway/router.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "net/http" 5 | "io/ioutil" 6 | "gateway/dto" 7 | "encoding/json" 8 | "gateway/model" 9 | "github.com/gorilla/mux" 10 | "github.com/boltdb/bolt" 11 | "fmt" 12 | "gateway/constant" 13 | ) 14 | 15 | var db *bolt.DB 16 | 17 | func setupRouter(dbConfig *bolt.DB) *mux.Router { 18 | 19 | // Database Config 20 | db = dbConfig 21 | 22 | // Routes 23 | router := mux.NewRouter() 24 | 25 | // Payments Routes 26 | router.HandleFunc("/v1/payments/authorization", PaymentsAuthorization).Methods("POST") 27 | router.HandleFunc("/v1/payments/capture/{authorization_id}", PaymentsCapture).Methods("POST") 28 | router.HandleFunc("/v1/payments/reversal/{authorization_id}", PaymentsReversal).Methods("POST") 29 | router.HandleFunc("/v1/payments/refund/{capture_id}", PaymentsRefund).Methods("POST") 30 | 31 | // Accounts Routes 32 | router.HandleFunc("/v1/accounts/create", AccountsCreate).Methods("GET") 33 | router.HandleFunc("/v1/accounts/deposit", AccountsDeposit).Methods("POST") 34 | router.HandleFunc("/v1/accounts/detail", AccountsDetail).Methods("POST") 35 | router.HandleFunc("/v1/accounts/statement", AccountsStatement).Methods("POST") 36 | 37 | return router 38 | } 39 | 40 | func PaymentsAuthorization(w http.ResponseWriter, r *http.Request) { 41 | 42 | // Read body 43 | b, err := ioutil.ReadAll(r.Body) 44 | defer r.Body.Close() 45 | if err != nil { 46 | http.Error(w, err.Error(), 500) 47 | return 48 | } 49 | 50 | // Unmarshal 51 | var authorizationRequestDto dto.AuthorizationRequestDto 52 | err = json.Unmarshal(b, &authorizationRequestDto) 53 | if err != nil { 54 | http.Error(w, err.Error(), 500) 55 | return 56 | } 57 | 58 | // Prepare Payment Response 59 | w.Header().Set("content-type", "application/json") 60 | 61 | // Basic Validation - Business Account 62 | var businessAccountId = r.Header.Get("From") 63 | var businessAccount model.Account 64 | if len(businessAccountId) > 0 { 65 | businessAccount, _ = getAccount(db, businessAccountId) 66 | } else { 67 | json.NewEncoder(w).Encode(dto.CreatePaymentResponseDto(authorizationRequestDto.OrderId, "3", "Invalid Merchant")) 68 | return 69 | } 70 | if businessAccount.Id != businessAccountId { 71 | json.NewEncoder(w).Encode(dto.CreatePaymentResponseDto(authorizationRequestDto.OrderId, "15", "No Such Issuer")) 72 | return 73 | } 74 | 75 | // Basic Validation - Personal Account 76 | var personalAccountId = fmt.Sprintf("%v", authorizationRequestDto.CardNumber) 77 | var personalAccount model.Account 78 | if len(personalAccountId) > 0 { 79 | personalAccount, _ = getAccount(db, personalAccountId) 80 | } else { 81 | json.NewEncoder(w).Encode(dto.CreatePaymentResponseDto(authorizationRequestDto.OrderId, "12", "Invalid Card Number")) 82 | return 83 | } 84 | if personalAccount.Id != personalAccountId { 85 | json.NewEncoder(w).Encode(dto.CreatePaymentResponseDto(authorizationRequestDto.OrderId, "56", "No Card Record")) 86 | return 87 | } 88 | 89 | if personalAccount.CardNumber != authorizationRequestDto.CardNumber || 90 | personalAccount.CardSecurityCode != authorizationRequestDto.CardSecurityCode || 91 | personalAccount.CardExpiryYear != authorizationRequestDto.CardExpiryYear || 92 | personalAccount.CardExpiryMonth != authorizationRequestDto.CardExpiryMonth { 93 | var payment = model.CreateAuthorizationPayment(authorizationRequestDto, 94 | personalAccount, 95 | businessAccount, 96 | "5", 97 | "Do Not Honour") 98 | savePayment(db, payment) 99 | businessAccount.Statement = append(businessAccount.Statement, payment.Id) 100 | saveAccount(db, businessAccount) 101 | json.NewEncoder(w).Encode(dto.CreatePaymentResponseDto(payment.Id, "5", "Do Not Honour")) 102 | return 103 | } 104 | 105 | if personalAccount.Available < authorizationRequestDto.Amount { 106 | var payment = model.CreateAuthorizationPayment(authorizationRequestDto, 107 | personalAccount, 108 | businessAccount, 109 | "51", 110 | "Insufficient Funds") 111 | savePayment(db, payment) 112 | businessAccount.Statement = append(businessAccount.Statement, payment.Id) 113 | saveAccount(db, businessAccount) 114 | json.NewEncoder(w).Encode(dto.CreatePaymentResponseDto(payment.Id, "51", "Insufficient Funds")) 115 | return 116 | } 117 | 118 | // Successful Payment 119 | personalAccount.Available = personalAccount.Available - authorizationRequestDto.Amount 120 | personalAccount.Blocked = personalAccount.Blocked + authorizationRequestDto.Amount 121 | saveAccount(db, personalAccount) 122 | businessAccount.Blocked = businessAccount.Blocked + authorizationRequestDto.Amount 123 | saveAccount(db, businessAccount) 124 | var payment = model.CreateAuthorizationPayment(authorizationRequestDto, 125 | personalAccount, 126 | businessAccount, 127 | "0", 128 | "Approved") 129 | savePayment(db, payment) 130 | businessAccount.Statement = append(businessAccount.Statement, payment.Id) 131 | saveAccount(db, businessAccount) 132 | personalAccount.Statement = append(personalAccount.Statement, payment.Id) 133 | saveAccount(db, personalAccount) 134 | json.NewEncoder(w).Encode(dto.CreatePaymentResponseDto(payment.Id, "0", "Approved")) 135 | 136 | return 137 | } 138 | 139 | func PaymentsCapture(w http.ResponseWriter, r *http.Request) { 140 | 141 | // Read Path Parameters 142 | vars := mux.Vars(r) 143 | 144 | // Read body 145 | b, err := ioutil.ReadAll(r.Body) 146 | defer r.Body.Close() 147 | if err != nil { 148 | http.Error(w, err.Error(), 500) 149 | return 150 | } 151 | 152 | // Unmarshal 153 | var successiveRequestDto dto.SuccessiveRequestDto 154 | err = json.Unmarshal(b, &successiveRequestDto) 155 | if err != nil { 156 | http.Error(w, err.Error(), 500) 157 | return 158 | } 159 | w.Header().Set("content-type", "application/json") 160 | 161 | // Basic Validation - Business Account 162 | var businessAccountId = r.Header.Get("From") 163 | var referenceId = vars["authorization_id"] 164 | var businessAccount model.Account 165 | if len(businessAccountId) > 0 { 166 | businessAccount, _ = getAccount(db, businessAccountId) 167 | } else { 168 | json.NewEncoder(w).Encode(dto.CreatePaymentResponseDto(referenceId, "3", "Invalid Merchant")) 169 | return 170 | } 171 | if businessAccount.Id != businessAccountId { 172 | json.NewEncoder(w).Encode(dto.CreatePaymentResponseDto(referenceId, "15", "No Such Issuer")) 173 | return 174 | } 175 | 176 | // Check if previous payment exists 177 | successiveRequestDto.Type = constant.CAPTURE 178 | successiveRequestDto.ReferenceId = referenceId 179 | if len(referenceId) <= 0 { 180 | json.NewEncoder(w).Encode(dto.CreatePaymentResponseDto(referenceId, "12", "Invalid Transaction ")) 181 | return 182 | } 183 | var referencedPayment, _ = getPayment(db, referenceId) 184 | if referencedPayment.Id != referenceId { 185 | json.NewEncoder(w).Encode(dto.CreatePaymentResponseDto(referenceId, "12", "Invalid Transaction ")) 186 | return 187 | } 188 | 189 | // Create successive payment 190 | var successivePayment model.Payment 191 | if referencedPayment.Operation == constant.AUTHORIZATION && referencedPayment.Status == "0" { 192 | if referencedPayment.CurrentAmount < successiveRequestDto.Amount { 193 | successivePayment = model.CreateSuccessivePayment(successiveRequestDto, 194 | referencedPayment, 195 | "13", 196 | "Invalid Amount") 197 | savePayment(db, successivePayment) 198 | businessAccount.Statement = append(businessAccount.Statement, successivePayment.Id) 199 | saveAccount(db, businessAccount) 200 | json.NewEncoder(w).Encode(dto.CreatePaymentResponseDto(successivePayment.Id, 201 | "13", 202 | "Invalid Amount")) 203 | return 204 | } else { 205 | referencedPayment.CurrentAmount = referencedPayment.CurrentAmount - successiveRequestDto.Amount 206 | savePayment(db, referencedPayment) 207 | successivePayment = model.CreateSuccessivePayment(successiveRequestDto, 208 | referencedPayment, 209 | "0", 210 | "Approved") 211 | savePayment(db, successivePayment) 212 | var personalAccountId = fmt.Sprintf("%v", referencedPayment.CardNumber) 213 | var personalAccount, _ = getAccount(db, personalAccountId) 214 | personalAccount.Blocked = personalAccount.Blocked - successiveRequestDto.Amount 215 | personalAccount.Statement = append(personalAccount.Statement, successivePayment.Id) 216 | saveAccount(db, personalAccount) 217 | businessAccount.Blocked = businessAccount.Blocked - successiveRequestDto.Amount 218 | businessAccount.Available = businessAccount.Available + successiveRequestDto.Amount 219 | businessAccount.Statement = append(businessAccount.Statement, successivePayment.Id) 220 | saveAccount(db, businessAccount) 221 | json.NewEncoder(w).Encode(dto.CreatePaymentResponseDto(successivePayment.Id, 222 | "0", 223 | "Approved")) 224 | return 225 | } 226 | 227 | } 228 | 229 | json.NewEncoder(w).Encode(dto.CreatePaymentResponseDto(successivePayment.Id, "12", "Invalid Transaction")) 230 | } 231 | 232 | func PaymentsReversal(w http.ResponseWriter, r *http.Request) { 233 | 234 | // Read Path Parameters 235 | vars := mux.Vars(r) 236 | 237 | // Read body 238 | b, err := ioutil.ReadAll(r.Body) 239 | defer r.Body.Close() 240 | if err != nil { 241 | http.Error(w, err.Error(), 500) 242 | return 243 | } 244 | 245 | // Unmarshal 246 | var successiveRequestDto dto.SuccessiveRequestDto 247 | err = json.Unmarshal(b, &successiveRequestDto) 248 | if err != nil { 249 | http.Error(w, err.Error(), 500) 250 | return 251 | } 252 | w.Header().Set("content-type", "application/json") 253 | 254 | // Basic Validation - Business Account 255 | var referenceId = vars["authorization_id"] 256 | var businessAccountId = r.Header.Get("From") 257 | var businessAccount model.Account 258 | if len(businessAccountId) > 0 { 259 | businessAccount, _ = getAccount(db, businessAccountId) 260 | } else { 261 | json.NewEncoder(w).Encode(dto.CreatePaymentResponseDto(referenceId, "3", "Invalid Merchant")) 262 | return 263 | } 264 | if businessAccount.Id != businessAccountId { 265 | json.NewEncoder(w).Encode(dto.CreatePaymentResponseDto(referenceId, "15", "No Such Issuer")) 266 | return 267 | } 268 | 269 | // Basic Validation - Payment 270 | successiveRequestDto.Type = constant.REVERSAL 271 | successiveRequestDto.ReferenceId = referenceId 272 | if len(referenceId) <= 0 { 273 | json.NewEncoder(w).Encode(dto.CreatePaymentResponseDto(referenceId, "12", "Invalid Transaction ")) 274 | return 275 | } 276 | var referencedPayment, _ = getPayment(db, referenceId) 277 | if referencedPayment.Id != successiveRequestDto.ReferenceId { 278 | json.NewEncoder(w).Encode(dto.CreatePaymentResponseDto(referenceId, "12", "Invalid Transaction ")) 279 | return 280 | } 281 | 282 | // Create Successive Payment 283 | var successivePayment model.Payment 284 | if referencedPayment.Operation == constant.AUTHORIZATION && referencedPayment.Status == "0" { 285 | if referencedPayment.CurrentAmount < successiveRequestDto.Amount { 286 | successivePayment = model.CreateSuccessivePayment(successiveRequestDto, 287 | referencedPayment, 288 | "13", 289 | "Invalid Amount") 290 | savePayment(db, successivePayment) 291 | businessAccount.Statement = append(businessAccount.Statement, successivePayment.Id) 292 | saveAccount(db, businessAccount) 293 | json.NewEncoder(w).Encode(dto.CreatePaymentResponseDto(successivePayment.Id, 294 | "13", 295 | "Invalid Amount")) 296 | return 297 | } else { 298 | referencedPayment.CurrentAmount = referencedPayment.CurrentAmount - successiveRequestDto.Amount 299 | savePayment(db, referencedPayment) 300 | successivePayment = model.CreateSuccessivePayment(successiveRequestDto, 301 | referencedPayment, 302 | "0", 303 | "Approved") 304 | savePayment(db, successivePayment) 305 | var personalAccountId = fmt.Sprintf("%v", referencedPayment.CardNumber) 306 | var personalAccount, _ = getAccount(db, personalAccountId) 307 | personalAccount.Blocked = personalAccount.Blocked - successiveRequestDto.Amount 308 | personalAccount.Available = personalAccount.Available + successiveRequestDto.Amount 309 | personalAccount.Statement = append(personalAccount.Statement, successivePayment.Id) 310 | saveAccount(db, personalAccount) 311 | businessAccount.Blocked = businessAccount.Blocked - successiveRequestDto.Amount 312 | businessAccount.Statement = append(businessAccount.Statement, successivePayment.Id) 313 | saveAccount(db, businessAccount) 314 | json.NewEncoder(w).Encode(dto.CreatePaymentResponseDto(successivePayment.Id, 315 | "0", 316 | "Approved")) 317 | return 318 | } 319 | 320 | } 321 | 322 | json.NewEncoder(w).Encode(dto.CreatePaymentResponseDto(successivePayment.Id, "12", "Invalid Transaction")) 323 | } 324 | 325 | func PaymentsRefund(w http.ResponseWriter, r *http.Request) { 326 | // Read Path Parameters 327 | vars := mux.Vars(r) 328 | 329 | // Read body 330 | b, err := ioutil.ReadAll(r.Body) 331 | defer r.Body.Close() 332 | if err != nil { 333 | http.Error(w, err.Error(), 500) 334 | return 335 | } 336 | 337 | // Unmarshal 338 | var successiveRequestDto dto.SuccessiveRequestDto 339 | err = json.Unmarshal(b, &successiveRequestDto) 340 | if err != nil { 341 | http.Error(w, err.Error(), 500) 342 | return 343 | } 344 | w.Header().Set("content-type", "application/json") 345 | 346 | // Basic Validation - Business Account 347 | var referenceId = vars["capture_id"] 348 | var businessAccountId = r.Header.Get("From") 349 | var businessAccount model.Account 350 | if len(businessAccountId) > 0 { 351 | businessAccount, _ = getAccount(db, businessAccountId) 352 | } else { 353 | json.NewEncoder(w).Encode(dto.CreatePaymentResponseDto(referenceId, "3", "Invalid Merchant")) 354 | return 355 | } 356 | if businessAccount.Id != businessAccountId { 357 | json.NewEncoder(w).Encode(dto.CreatePaymentResponseDto(referenceId, "15", "No Such Issuer")) 358 | return 359 | } 360 | 361 | // Basic Validation - Payment 362 | successiveRequestDto.Type = constant.REFUND 363 | successiveRequestDto.ReferenceId = referenceId 364 | if len(referenceId) <= 0 { 365 | json.NewEncoder(w).Encode(dto.CreatePaymentResponseDto(referenceId, "12", "Invalid Transaction ")) 366 | return 367 | } 368 | var referencedPayment, _ = getPayment(db, referenceId) 369 | if referencedPayment.Id != successiveRequestDto.ReferenceId { 370 | json.NewEncoder(w).Encode(dto.CreatePaymentResponseDto(referenceId, "12", "Invalid Transaction ")) 371 | return 372 | } 373 | 374 | // Create Successive Payment 375 | var successivePayment model.Payment 376 | if referencedPayment.Operation == constant.CAPTURE && referencedPayment.Status == "0" { 377 | if referencedPayment.CurrentAmount < successiveRequestDto.Amount { 378 | successivePayment = model.CreateSuccessivePayment(successiveRequestDto, 379 | referencedPayment, 380 | "13", 381 | "Invalid Amount") 382 | savePayment(db, successivePayment) 383 | businessAccount.Statement = append(businessAccount.Statement, successivePayment.Id) 384 | saveAccount(db, businessAccount) 385 | json.NewEncoder(w).Encode(dto.CreatePaymentResponseDto(successivePayment.Id, 386 | "13", 387 | "Invalid Amount")) 388 | return 389 | } else { 390 | referencedPayment.CurrentAmount = referencedPayment.CurrentAmount - successiveRequestDto.Amount 391 | savePayment(db, referencedPayment) 392 | successivePayment = model.CreateSuccessivePayment(successiveRequestDto, 393 | referencedPayment, 394 | "0", 395 | "Approved") 396 | savePayment(db, successivePayment) 397 | var personalAccountId = fmt.Sprintf("%v", referencedPayment.CardNumber) 398 | var personalAccount, _ = getAccount(db, personalAccountId) 399 | personalAccount.Available = personalAccount.Available + successiveRequestDto.Amount 400 | personalAccount.Statement = append(personalAccount.Statement, successivePayment.Id) 401 | saveAccount(db, personalAccount) 402 | businessAccount.Available = businessAccount.Available - successiveRequestDto.Amount 403 | businessAccount.Statement = append(businessAccount.Statement, successivePayment.Id) 404 | saveAccount(db, businessAccount) 405 | json.NewEncoder(w).Encode(dto.CreatePaymentResponseDto(successivePayment.Id, 406 | "0", 407 | "Approved")) 408 | return 409 | } 410 | 411 | } 412 | 413 | json.NewEncoder(w).Encode(dto.CreatePaymentResponseDto(successivePayment.Id, "12", "Invalid Transaction")) 414 | } 415 | 416 | func AccountsCreate(w http.ResponseWriter, r *http.Request) { 417 | 418 | // Create Account 419 | var account = model.GenerateAccount() 420 | saveAccount(db, account) 421 | account.Statement = nil 422 | 423 | // Reply with Account Details 424 | w.Header().Set("Content-Type", "application/json") 425 | json.NewEncoder(w).Encode(account) 426 | } 427 | 428 | func AccountsDeposit(w http.ResponseWriter, r *http.Request) { 429 | 430 | // Read body 431 | b, err := ioutil.ReadAll(r.Body) 432 | defer r.Body.Close() 433 | if err != nil { 434 | http.Error(w, err.Error(), 500) 435 | return 436 | } 437 | 438 | // Unmarshal 439 | var accountRequestDto dto.AccountRequestDto 440 | err = json.Unmarshal(b, &accountRequestDto) 441 | if err != nil { 442 | http.Error(w, err.Error(), 500) 443 | return 444 | } 445 | 446 | // Validate Account 447 | var accountResponseDto = dto.CreateAccountResponseDto(accountRequestDto.Id, "14", "Invalid Card Number") 448 | if len(accountRequestDto.Id) > 0 { 449 | var account, _ = getAccount(db, accountRequestDto.Id) 450 | if len(account.Id) > 0 { 451 | account.Available = account.Available + accountRequestDto.Amount 452 | saveAccount(db, account) 453 | accountResponseDto = dto.CreateAccountResponseDto(accountRequestDto.Id, "0", "Approved") 454 | } 455 | } 456 | 457 | // Reply with Account Operation 458 | w.Header().Set("Content-Type", "application/json") 459 | json.NewEncoder(w).Encode(accountResponseDto) 460 | } 461 | 462 | func AccountsDetail(w http.ResponseWriter, r *http.Request) { 463 | 464 | // Read body 465 | b, err := ioutil.ReadAll(r.Body) 466 | defer r.Body.Close() 467 | if err != nil { 468 | http.Error(w, err.Error(), 500) 469 | return 470 | } 471 | 472 | // Unmarshal 473 | var accountRequestDto dto.AccountRequestDto 474 | err = json.Unmarshal(b, &accountRequestDto) 475 | if err != nil { 476 | http.Error(w, err.Error(), 500) 477 | return 478 | } 479 | 480 | // Validate Account 481 | var account model.Account 482 | if len(accountRequestDto.Id) > 0 { 483 | account, _ = getAccount(db, accountRequestDto.Id) 484 | } 485 | 486 | // Reply with Account Operation 487 | w.Header().Set("Content-Type", "application/json") 488 | json.NewEncoder(w).Encode(account) 489 | } 490 | 491 | func AccountsStatement(w http.ResponseWriter, r *http.Request) { 492 | 493 | // Read body 494 | b, err := ioutil.ReadAll(r.Body) 495 | defer r.Body.Close() 496 | if err != nil { 497 | http.Error(w, err.Error(), 500) 498 | return 499 | } 500 | 501 | // Unmarshal 502 | var accountRequestDto dto.AccountRequestDto 503 | err = json.Unmarshal(b, &accountRequestDto) 504 | if err != nil { 505 | http.Error(w, err.Error(), 500) 506 | return 507 | } 508 | 509 | // Validate Account 510 | var accountStatementDto model.AccountStatementDto 511 | if len(accountRequestDto.Id) > 0 { 512 | var account, _ = getAccount(db, accountRequestDto.Id) 513 | if len(account.Id) > 0 { 514 | for i := range account.Statement { 515 | var payment, _ = getPayment(db, account.Statement[i]) 516 | accountStatementDto.Statement = append(accountStatementDto.Statement, payment) 517 | } 518 | } 519 | } 520 | 521 | // Reply with Account Operation 522 | w.Header().Set("Content-Type", "application/json") 523 | json.NewEncoder(w).Encode(accountStatementDto) 524 | 525 | } 526 | --------------------------------------------------------------------------------