[libeufin] 01/02: Activating withdrawals from the Sandbox.

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ms pushed a commit to branch master
in repository libeufin.

commit 94740f4989096a12298e89c23c7253a157238da8
Author: ms <ms@taler.net>
AuthorDate: Sat Sep 18 07:51:38 2021 +0200

    Activating withdrawals from the Sandbox.
    
    At this point, the Sandbox offers a /taler endpoint that
    creates a withdraw operation and returns (only) the corresponding
    taler://-URI that should then be passed to the CLI wallet.
    
    For simplicity, the Sandbox expects to have three canonical
    bank accounts: exchange, customer, merchant, and refuses to
    continue whenever one is not found.
    
    Lastly, Sandbox now expects the hostname to be specified in
    a environment variable; it should be noted that another way
    to retrieve the hostname is already under development, but it
    is not finished yet.
---
 .../src/main/kotlin/tech/libeufin/sandbox/DB.kt    | 10 ++++++
 .../src/main/kotlin/tech/libeufin/sandbox/Main.kt  | 40 +++++++++++++++++++++-
 util/src/main/kotlin/Config.kt                     |  9 +++++
 3 files changed, 58 insertions(+), 1 deletion(-)

diff --git a/sandbox/src/main/kotlin/tech/libeufin/sandbox/DB.kt 
b/sandbox/src/main/kotlin/tech/libeufin/sandbox/DB.kt
index 9c0a279..fc7c9bd 100644
--- a/sandbox/src/main/kotlin/tech/libeufin/sandbox/DB.kt
+++ b/sandbox/src/main/kotlin/tech/libeufin/sandbox/DB.kt
@@ -407,6 +407,14 @@ class BankAccountStatementEntity(id: EntityID<Int>) : 
IntEntity(id) {
     var balanceClbd by BankAccountStatementsTable.balanceClbd
 }
 
+object TalerWithdrawalsTable : LongIdTable() {
+    val wopid = uuid("wopid").autoGenerate()
+}
+class TalerWithdrawalEntity(id: EntityID<Long>) : LongEntity(id) {
+    companion object : 
LongEntityClass<TalerWithdrawalEntity>(TalerWithdrawalsTable)
+    var wopid by TalerWithdrawalsTable.wopid
+}
+
 object BankAccountReportsTable : IntIdTable() {
     val reportId = text("reportId")
     val creationTime = long("creationTime")
@@ -414,6 +422,8 @@ object BankAccountReportsTable : IntIdTable() {
     val bankAccount = reference("bankAccount", BankAccountsTable)
 }
 
+
+
 fun dbDropTables(dbConnectionString: String) {
     Database.connect(dbConnectionString)
     transaction {
diff --git a/sandbox/src/main/kotlin/tech/libeufin/sandbox/Main.kt 
b/sandbox/src/main/kotlin/tech/libeufin/sandbox/Main.kt
index 4a01d5f..f42b5bf 100644
--- a/sandbox/src/main/kotlin/tech/libeufin/sandbox/Main.kt
+++ b/sandbox/src/main/kotlin/tech/libeufin/sandbox/Main.kt
@@ -83,8 +83,9 @@ import java.util.*
 import kotlin.random.Random
 import kotlin.system.exitProcess
 
-const val SANDBOX_DB_ENV_VAR_NAME = "LIBEUFIN_SANDBOX_DB_CONNECTION"
 private val logger: Logger = LoggerFactory.getLogger("tech.libeufin.sandbox")
+private val hostName: String? = getHostnameFromEnv("LIBEUFIN_SANDBOX_HOSTNAME")
+const val SANDBOX_DB_ENV_VAR_NAME = "LIBEUFIN_SANDBOX_DB_CONNECTION"
 
 data class SandboxError(
     val statusCode: HttpStatusCode,
@@ -994,6 +995,43 @@ fun serverMain(dbName: String, port: Int) {
                 }
 
             }
+            /**
+             * Activates a withdraw operation of 1 currency unit with
+             * the default exchange, from a designated/constant customer.
+             */
+            get("/taler") {
+                requireSuperuser(call.request)
+                SandboxAssert(
+                    hostName != null,
+                    "Own hostname not found.  Logs should have warned"
+                )
+                // check that the three canonical accounts exist
+                val wo = transaction {
+                    val exchange = BankAccountEntity.find {
+                        BankAccountsTable.label eq "sandbox-account-exchange"
+                    }.firstOrNull()
+                    val customer = BankAccountEntity.find {
+                        BankAccountsTable.label eq "sandbox-account-customer"
+                    }.firstOrNull()
+                    val merchant = BankAccountEntity.find {
+                        BankAccountsTable.label eq "sandbox-account-merchant"
+                    }.firstOrNull()
+
+                    SandboxAssert(exchange != null, "exchange has no bank 
account")
+                    SandboxAssert(customer != null, "customer has no bank 
account")
+                    SandboxAssert(merchant != null, "merchant has no bank 
account")
+
+                    // At this point, the three actors exist and a new 
withdraw operation can be created.
+                    TalerWithdrawalEntity.new {
+                        // wopid is autogenerated, and momentarily the only 
column
+                    }
+                }
+                /**
+                 * Future versions will include the QR code in this response.
+                 */
+                
call.respondText("taler://withdraw/${hostName}/api/${wo.wopid}")
+                return@get
+            }
         }
     }
     logger.info("LibEuFin Sandbox running on port $port")
diff --git a/util/src/main/kotlin/Config.kt b/util/src/main/kotlin/Config.kt
index 800ae69..d7a1436 100644
--- a/util/src/main/kotlin/Config.kt
+++ b/util/src/main/kotlin/Config.kt
@@ -50,6 +50,15 @@ fun setLogLevel(logLevel: String?) {
     }
 }
 
+fun getHostnameFromEnv(varName: String): String? {
+    val hostName = System.getenv(varName)
+    if (hostName.isNullOrBlank() or hostName.isNullOrEmpty()) {
+        println("WARNING, the hostname wasn't found in env's $varName. Will 
stay unknown")
+        return null
+    }
+    return hostName
+}
+
 fun getDbConnFromEnv(varName: String): String {
     val dbConnStr = System.getenv(varName)
     if (dbConnStr.isNullOrBlank() or dbConnStr.isNullOrEmpty()) {

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