Add get_account_history api request

Sources/Steem/API.swift

@@ -1,6 +1,7 @@
 /// Steem RPC requests and responses.
 /// - Author: Johan Nordberg <johan@steemit.com>
 
+import AnyCodable
 import Foundation
 
 /// Steem RPC API request- and response-types.
@@ -138,4 +139,44 @@ public struct API {
             self.params = RequestParams([names])
         }
     }
+
+    public struct OperationObject: Decodable {
+        public let trxId: Data
+        public let block: UInt32
+        public let trxInBlock: UInt32
+        public let opInTrx: UInt32
+        public let virtualOp: UInt32
+        public let timestamp: Date
+        private let op: AnyOperation
+        public var operation: OperationType {
+            return self.op.operation
+        }
+    }
+
+    public struct AccountHistoryObject: Decodable {
+        public let id: UInt32
+        public let value: OperationObject
+        public init(from decoder: Decoder) throws {
+            var container = try decoder.unkeyedContainer()
+            self.id = try container.decode(UInt32.self)
+            self.value = try container.decode(OperationObject.self)
+        }
+    }
+
+    public struct GetAccountHistory: Request, Encodable {
+        public typealias Response = [AccountHistoryObject]
+        public let method = "get_account_history"
+        public var params: RequestParams<AnyEncodable>? {
+            return RequestParams([AnyEncodable(self.account), AnyEncodable(self.from), AnyEncodable(self.limit)])
+        }
+
+        public var account: String
+        public var from: Int
+        public var limit: Int
+        public init(account: String, from: Int = -1, limit: Int = 100) {
+            self.account = account
+            self.from = from
+            self.limit = limit
+        }
+    }
 }

Tests/SteemIntegrationTests/API.swift

@@ -116,4 +116,15 @@ class ClientTest: XCTestCase {
         XCTAssertEqual(account.name, "almost-digital")
         XCTAssertEqual(account.created, Date(timeIntervalSince1970: 1_496_691_060))
     }
+
+    func testGetAccountHistory() throws {
+        let req = API.GetAccountHistory(account: "almost-digital", from: 0, limit: 0)
+        let result = try client.sendSynchronous(req)
+        guard let r = result?.first else {
+            XCTFail("No results returned")
+            return
+        }
+        let createOp = r.value.operation as? Steem.Operation.AccountCreateWithDelegation
+        XCTAssertEqual(createOp?.newAccountName, "almost-digital")
+    }
 }