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I'm trying to generate an RSA pair key, then add an X.509 certificate to the header of Public Key. For this, I'm using library SwiftyRSA
The problem is that when I add the X.509 certificate to the header I cannot parse the Public Key. When I print the Public Key after that, it still shows the same as it was without the certificate.
But when I print bytes it shows different bytes, without the certificate it shows 270 bytes, with the certificate it shows 294bytes. This means it's adding the certificate but it's not parsing it with the certificate.
After reading deeper in SwiftyRSA library, it says:
Warning : Storing (with SwiftyRSA's methods) or creating a PublicKey
instance will automatically strip the header from the key. For more
info, see Under the hood above.
If worth mentioning even the case that is still Opened there.
I'm still looking for a solution but cannot find any. The code that I tried to implement:
if let password = passwordTextField.text {
//Generate RSA
guard let keyPair = try? SwiftyRSA.generateRSAKeyPair(sizeInBits: 2048),
let privateKeyPem = try? keyPair.privateKey.pemString(),
let publicKeyPem = try? keyPair.publicKey.pemString()
else {
return
}
/// Generate Certificate in format X.509 from Public Key
let publicKey = try! PublicKey(data: keyPair.publicKey.data())
let publicKeyData = try! keyPair.publicKey.data()
let publicKey_with_X509_header = try! SwiftyRSA.prependX509KeyHeader(keyData: publicKeyData)
let publicKey509 = try! PublicKey(data: publicKey_with_X509_header)
print(try! publicKey.pemString()) // Without Certificate
print(try! publicKey509.pemString()) // With Certificate
// These two print results are completely the same, but it should be different.
// Encrypt private key
let salt = String.random(length: 32)
let aesKey = Array(String((password + salt).prefix(32)).utf8)
let iv = [UInt8](String(salt.prefix(16)).utf8)
guard let aes = try? AES(key: aesKey, blockMode: CBC(iv: iv), padding: .pkcs7),
let inputData = privateKeyPem.data(using: .utf8),
let encryptedBytes = try? aes.encrypt(inputData.bytes)
else {
return
}
let encryptedData = NSData(bytes: encryptedBytes, length: encryptedBytes.count)
let base64String = encryptedData.base64EncodedString(options: NSData.Base64EncodingOptions(rawValue: 0))
// Print keys and salt
print(try! publicKey509.pemString())
print(base64String)
print(salt)
}
How can I parse the Public Key with an x509 certificate?
I would appreciate any contribution.
As mentioned above, you won't be able to create x509 certificate with SwiftyRSA. You can actually do this with Security framework.
First, you need to create an extension of Data, which will be used to add the certificate to the public key.
extension Data {
public func dataByPrependingX509Header() -> Data {
let result = NSMutableData()
let encodingLength: Int = (self.count + 1).encodedOctets().count
let OID: [CUnsignedChar] = [0x30, 0x0d, 0x06, 0x09, 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x01, 0x01, 0x01, 0x05, 0x00]
var builder: [CUnsignedChar] = []
// ASN.1 SEQUENCE
builder.append(0x30)
// Overall size, made of OID + bitstring encoding + actual key
let size = OID.count + 2 + encodingLength + self.count
let encodedSize = size.encodedOctets()
builder.append(contentsOf: encodedSize)
result.append(builder, length: builder.count)
result.append(OID, length: OID.count)
builder.removeAll(keepingCapacity: false)
builder.append(0x03)
builder.append(contentsOf: (self.count + 1).encodedOctets())
builder.append(0x00)
result.append(builder, length: builder.count)
// Actual key bytes
result.append(self)
return result as Data
}
}
Then, make sure you import Security and, you change your code to this:
// Generate keys
if let password = passwordTextField.text {
//Generate RSA
let attributes: [String: Any] = [
String(kSecAttrKeyType): kSecAttrKeyTypeRSA,
String(kSecAttrKeySizeInBits): 4096, // you can change the size to 2048, but 4096 has higher security.
String(kSecPrivateKeyAttrs): [
String(kSecAttrIsPermanent): true,
String(kSecAttrApplicationTag): "com.example.keys.mykey"]
]
var error: Unmanaged<CFError>?
// Private Key
guard let privateKey = SecKeyCreateRandomKey(attributes as CFDictionary, &error) else {
fatalError("Error: \(error.debugDescription)")
}
let privateKeyData = SecKeyCopyExternalRepresentation(privateKey, &error)
let privData = privateKeyData as Data?
let privateKeyString = privData!.base64EncodedString()
print("Private Key")
print(privateKeyString)
// You'll probably need to structure Private and public key to go in new line every time after 76 character
let structuredPrivateKeyString = privateKeyString.inserting(separator: "\n", every: 76)
let privateKeyFinal = "-----BEGIN RSA PRIVATE KEY-----\n" + structuredPrivateKeyString + "\n\n-----END RSA PRIVATE KEY-----"
print(privateKeyFinal)
// Public Key
let publicKey = SecKeyCopyPublicKey(privateKey) // generate public key from private key
let publicKeyData = SecKeyCopyExternalRepresentation(publicKey!, &error)
let pubData = publicKeyData as Data? // We need to turn it into data so we can add the certificate or print it as string
print("Public Key")
print(pubData!.base64EncodedString())
// Add x509 certificate to public key
let publicKeyX509 = SecKeyCopyPublicKey(privateKey)
let publicKeyDataX509 = SecKeyCopyExternalRepresentation(publicKeyX509!, &error)
let pubData1 = publicKeyDataX509 as Data?
let x509Data = pubData1!.dataByPrependingX509Header() // Here we add the certificate (Function that we created previosly in Data extension).
var publicKeyX509String = x509Data.base64EncodedString()
print("Public Key x509")
print(publicKeyX509String)
let structuredPublicKeyX509String = publicKeyX509String.inserting(separator: "\n", every: 76)
let publicKeyFinal = "-----BEGIN RSA PUBLIC KEY-----\n\(structuredPublicKeyX509String)\n\n-----END RSA PUBLIC KEY-----"
print("Public Key for the API")
print(publicKeyFinal)
// Encrypt private key
let salt = String.random(length: 32)
let aesKey = Array(String((password + salt).prefix(32)).utf8)
let iv = [UInt8](String(salt.prefix(16)).utf8)
guard let aes = try? AES(key: aesKey, blockMode: CBC(iv: iv), padding: .pkcs7),
let inputData = privateKeyFinal.data(using: .utf8),
let encryptedBytes = try? aes.encrypt(inputData.bytes)
else {
setLoadingView(visible: false)
return
}
let encryptedData = NSData(bytes: encryptedBytes, length: encryptedBytes.count)
let base64String = encryptedData.base64EncodedString(options: NSData.Base64EncodingOptions(rawValue: 0))
// Print keys and salt
print(publicKeyFinal)
print(base64String)
print(salt)
}
Note: I added a comment on each line that I thought is important, so you will now what's happening.
It is my first time working with smart contracts and my goal is to create a mobile app which can interact with it by calling methods to save or retrieve data. For this reason I have created a very simple contract using Remix and I have also deployed on Rinkeby testnet.
contract Storage {
uint256 number;
function store(uint256 num) public {
number = num;
}
function retrieve() public view returns (uint256){
return number;
}
}
Then I built a SwiftUI app, which has one button. When I press this button, I want to call the store method and save some int number. For example number 9. Therefore I have created a function called write which looks as following:
let myInt = 9
func write() {
let web3 = Web3.InfuraRinkebyWeb3(accessToken: "https://rinkeby.infura.io/v3/a146daf63d93490995823f0910f50118")
let walletAddress = EthereumAddress("0xc65943Fae5a554e7DCF916F8828a73E5f7b1bDCd")! // Your wallet address
let contractMethod = "store" // Contract method you want to write
let contractABI = contractABIString // Contract ABI
let contractAddress = EthereumAddress("0x2826C42354FE5B816c7E21AD9e3B395Ced512C0C")!
let abiVersion = 2 // Contract ABI version
let parameters = [myInt] as [AnyObject]
let extraData: Data = Data() // Extra data for contract method
let contract = web3.contract(contractABI, at: contractAddress, abiVersion: abiVersion)!
var options = TransactionOptions.defaultOptions
options.from = walletAddress
options.gasPrice = .automatic
options.gasLimit = .automatic
do {
contract.write(
contractMethod,
parameters: parameters,
extraData: extraData,
transactionOptions: options)
} catch {
print("error:", error)
}
Unfortunately, when I run this code, nothing is happening. I don't get any error but when I refresh the contract I see that number 9 is not passed.
I am using web3swift library, https://github.com/skywinder/web3swift/tree/master#send-erc-20-token. According to the documentation, it should be fine, but it is not working, therefore I would really appreciate some assistant to make it work or some example projects where I can take a look, because I also couldn't find anything.
I found some other project using JS and I see the people there use their private keys, maybe I also need it, but since it is not shown in the documentation, I was not sure how to use it.
The smart contract interaction requires a few initialisations steps:
Your wallet
KeyStoreManager
web3
Let's assume you already got a Metamask wallet.
Separately you need to have a separate file containing the ABI of the smartContract you want to interact with.
It is an array and having it in a Swift.String is easier.(I won't show you this step)
struct Wallet {
let address: String
let data: Data
let name: String
let isHD: Bool
}
class SmartContractInteraction {
var wallet: Wallet!
var keystoreManager: KeystoreManager!
var web3: web3!
init() {
wallet = initializeWallet()
keystoreManager = getKeyStoreManager()
web3 = initializeweb3()
}
private func initializeWallet() -> Wallet? {
let password = "PasswordMetamask"
let key = "AccountPrivateKey"
let formattedKey = key.trimmingCharacters(in: .whitespacesAndNewlines)
let dataKey = Data.fromHex(formattedKey)!
let name = "Account 1"
do {
let keystore = try EthereumKeystoreV3(privateKey: dataKey, password: password)!
let keyData = try JSONEncoder().encode(keystore.keystoreParams)
let address = keystore.addresses!.first!.address
return Wallet(address: address, data: keyData, name: name, isHD: false)
} catch {
print("wallet init failed: \(error)")
return nil
}
}
private func getKeyStoreManager() -> KeystoreManager {
let data = wallet.data
let keystoreManager: KeystoreManager
if wallet.isHD {
let keystore = BIP32Keystore(data)!
keystoreManager = KeystoreManager([keystore])
} else {
let keystore = EthereumKeystoreV3(data)!
keystoreManager = KeystoreManager([keystore])
}
return keystoreManager
}
private func initializeweb3() -> web3 {
let endpoint = "https://ropsten.infura.io/v3/....."
let web3 = web3swift.web3(provider: Web3HttpProvider(URL(string: endpoint)!)!)
web3.addKeystoreManager(keystoreManager)
return web3
}
func callSmartContract() {
let value: String = "1"
let walletAddress = EthereumAddress(wallet.address)!
let contractAddress = EthereumAddress("SmartContractAddress")!
let contractMethod = "store"
let contractABI = MyContractABI
let abiVersion = 2
let parameters = [9] as [AnyObject]
let extraData: Data = Data()
let contract = web3.contract(contractABI, at: contractAddress, abiVersion: abiVersion)!
let amount = Web3.Utils.parseToBigUInt(value, units: .wei)
var options = TransactionOptions.defaultOptions
options.value = amount
options.from = walletAddress
options.gasPrice = .automatic
options.gasLimit = .automatic
let tx = contract.write(
contractMethod,
parameters: parameters,
extraData: extraData,
transactionOptions: options)!
do {
let password = "MetamaskPassword"
let result = try tx.send(password: password)
print(result)
} catch {
print("Token Balance failed: \(error)")
}
}
}
Like this should work, I think passing the value/option.value in the smartContract call method isn't necessary, but since I don't have your ABI I prefer to not remove anything from how it worked for me. Also I am not sure about the type of the number you pass.
Feel free to edit if this works without :)
I'm a newbie at firebase I have implemented a sample app that able to transfer point to each other after transfer success I also added two fields called "sender_name" and "receiver_name" but it's too difficult to get all transitions based on user login I found sample ways to do just add multiple where to it, its work fine if true both but that's not what I want I want whereOr like SQL as an example below
SELECT column1, column2, ...
FROM table_name
WHERE condition1 OR condition2 OR condition3 ...;
any solution help, please
func getUserTransition(){
// process
/*
1.get all transition from tm_members sender and receiver by current user login
2.
*/
guard let username = self.userSession?.username else {
return
}
print("username in user session : \(username)")
COLLECTION_TM_TRANSITIONS_UAT
.whereField("sender_name", isEqualTo: username)
.whereField("receiver_name", isEqualTo: username)
.getDocuments { documentSnapshot, error in
if error == nil {
guard let value = documentSnapshot?.documents else { return }
self.tmTransitions = value.map { (queryDocumentSnapshot) -> TmTransition in
let data = queryDocumentSnapshot.data()
let email = data["email"] as? String ?? ""
let is_sender = data["is_sender"] as? Bool ?? false
let point = data["point"] as? Int ?? 0
let username = data["username"] as? String ?? ""
let sender_id = data["sender_id"] as? String ?? ""
let receiver_id = data["receiver_id"] as? String ?? ""
let created_at = data["created_at"] as? Timestamp
let sender_name = data["sender_name"] as? String ?? ""
let receiver_name = data["receiver_name"] as? String ?? ""
print("username : \(email)")
return TmTransition(id: queryDocumentSnapshot.documentID, sender_id: sender_id, receiver_id: receiver_id, username: username, is_sender: is_sender, point: point, email: email,created_at: created_at,sender_name: sender_name,receiver_name: receiver_name)
}
}
else{
print("error during fetch data ")
}
}
}
I am trying to interact with a smart contract I set up.
Basically the goal is to set from an iOS App 5 Parameters
projectTitle
projectLocation
projectStart
projectEnd
teamType
I want the user to set those parameters and write it on the ropsten testnetwork.
I also would like to get the contract information at a later point whenever the user feels for it.
my solidity code is working properly in remix and the contract is already deployed:
pragma solidity >=0.4.22 <0.7.0;
contract ProjectContent {
string public projectTitle;
string public projectLocation;
string public projectStart;
string public projectEnd;
string public teamType;
function projectContent(string initialProjectTitle, string initialProjectLocation, string initialProjectStart, string initialProjectEnd, string initialTeamType) public {
projectTitle = initialProjectTitle;
projectLocation = initialProjectLocation;
projectStart = initialProjectStart;
projectEnd = initialProjectEnd;
teamType = initialTeamType;
}
function setContract(string newProjectTitle, string newProjectLocation, string newProjectStart, string newProjectEnd, string newTeamType) public {
projectTitle = newProjectTitle;
projectLocation = newProjectLocation;
projectStart = newProjectStart;
projectEnd = newProjectEnd;
teamType = newTeamType;
}
function getProjectTitle() public view returns (string) {
return projectTitle;
}
function getProjectLocation() public view returns (string) {
return projectLocation;
}
function getProjectStart() public view returns (string) {
return projectStart;
}
function getProjectEnd() public view returns (string) {
return projectEnd;
}
function getTeamType() public view returns (string) {
return teamType;
}
}
My problem now is that I cannot figure out how to retrieve the data from the blockchain using the web3swift library. I am doing it like so now:
class ProjectContractViewController: UIViewController, HalfModalPresentable {
#IBOutlet weak var contractABIView: UITextView!
var halfModalTransitioningDelegate: HalfModalTransitioningDelegate?
var contractABI = "[{\"constant\":false,\"inputs\":[{\"name\":\"initialProjectTitle\",\"type\":\"string\"},{\"name\":\"initialProjectLocation\",\"type\":\"string\"},{\"name\":\"initialProjectStart\",\"type\":\"string\"},{\"name\":\"initialProjectEnd\",\"type\":\"string\"},{\"name\":\"initialTeamType\",\"type\":\"string\"}],\"name\":\"projectContent\",\"outputs\":[],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"name\":\"newProjectTitle\",\"type\":\"string\"},{\"name\":\"newProjectLocation\",\"type\":\"string\"},{\"name\":\"newProjectStart\",\"type\":\"string\"},{\"name\":\"newProjectEnd\",\"type\":\"string\"},{\"name\":\"newTeamType\",\"type\":\"string\"}],\"name\":\"setContract\",\"outputs\":[],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"getProjectEnd\",\"outputs\":[{\"name\":\"\",\"type\":\"string\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"getProjectLocation\",\"outputs\":[{\"name\":\"\",\"type\":\"string\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"getProjectStart\",\"outputs\":[{\"name\":\"\",\"type\":\"string\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"getProjectTitle\",\"outputs\":[{\"name\":\"\",\"type\":\"string\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"getTeamType\",\"outputs\":[{\"name\":\"\",\"type\":\"string\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"projectEnd\",\"outputs\":[{\"name\":\"\",\"type\":\"string\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"projectLocation\",\"outputs\":[{\"name\":\"\",\"type\":\"string\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"projectStart\",\"outputs\":[{\"name\":\"\",\"type\":\"string\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"projectTitle\",\"outputs\":[{\"name\":\"\",\"type\":\"string\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"teamType\",\"outputs\":[{\"name\":\"\",\"type\":\"string\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"}]"
let str = "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var contractAddress = EthereumAddress("0x11A0c067d7481240dCA57457eff77fc98dEAdE0F")
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
func callContract(Password: String) {
// Get from address from private key
let formattedKey = Password.trimmingCharacters(in: .whitespacesAndNewlines)
let dataKey = Data.fromHex(formattedKey )!
// ### use [passKey]
let keystore = try! EthereumKeystoreV3(privateKey: dataKey, password: "")!
let keyData = try! JSONEncoder().encode(keystore.keystoreParams)
// let address = keystore.addresses!.first!.address
let address = keystore.addresses!.first!.address
let ethAddress = EthereumAddress(address)
let infura = Web3.InfuraMainnetWeb3()
// 1
let contract = infura.contract(contractABI, at: contractAddress, abiVersion: 2)
// 2
var options = TransactionOptions.defaultOptions
options.from = keystore.addresses!.first!
// 3
let data = Data.init(hex: str)
let transactionIntermediate = contract?.method("getProjectTitle", parameters: [address] as [AnyObject], extraData: data, transactionOptions: options)
// 4
let result = transactionIntermediate!.call(transactionOptions: options)
switch result {
// 5
case .success(let res):
let ans = res["0"] as! Bool
DispatchQueue.main.async {
completion(Result.Success(ans))
}
case .failure(let error):
DispatchQueue.main.async {
completion(Result.Error(error))
}
}
}
}
I get an error for the resultsaying:
"Call can throw, but it is not marked with 'try' and the error is not handled"
and in general I find it really hard to set up the interaction with a smart contract abi.
I am already using the web3swift functionality for sending transactions at it works like a charm.
Maybe someone knows how I can record information on the blockchain and get it using web3swift.
You are close. Starting with the error "Call can throw, but it is not marked with 'try' and the error is not handled" this is caused by trying to call a contract function without using the Try Catch pattern. Do to the way web3 library is designed this pattern is necessary for all write and call methods.
// Incorrect
let result = transactionIntermediate!.call(transactionOptions: options)
// Correct
do {
let result = try transactionIntermediate!.call(transactionOptions: options)
}catch{
print("Error trying to call method \(error)")
}
Additionally, I recommend using the DispatchQueue.main.async along with Promise Kit library when making your contract calls.
ABIs are hard to read and messy, don't recommend using it to help find callable methods and parameters within the contract. Instead I would have the contract open along side Xcode and through the use of either an enum or struct containing all the contract methods that are going to be used.
// Methods available within the contract
enum ContractMethods:String {
case projectContract = "projectContent"
case setContract = "setContract"
case getProjectTitle = "getProjectTitle"
case getProjectLocation = "getProjectLocation"
case getProjectStart = "getProjectStart"
case getProjectEnd = "getProjectEnd"
case getTeamType = "getTeamType"
}
// Usage
ContractMethods.setContract.rawValue
I moved the ABI to a separate file within xcode to keep it clean. Here is link to the file.
Here is a good example to help get you started. Check out my GitHub repo for the improved version.
import UIKit
import web3swift
import PromiseKit
struct Wallet {
let address: String
let data: Data
let name:String
let isHD:Bool
}
struct HDKey {
let name:String?
let address:String
}
var password = "" // leave empty for ganache or use your wallet password
let privateKey = "<PrivateKey>" // Private key of wallet
let walletName = "MyWallet"
let contractAddress = "<ContractAddress>" // 0x11A0c067d7481240dCA57457eff77fc98dEAdE0F
let endpoint = URL(string:"http://127.0.0.1:7545")! // Im using Ganache but it might look like endpoint = URL(string:"https://rinkeby.infura.io/v3/<APIKEY>")!
let abiVersion = 2
class ViewController: UIViewController {
// Mock data used within contract
let projectTitle = "HouseSiding"
let projectLocation = "299 Race Ave. Dacula, GA 30019"
let projectStart = "May 14, 2021"
let projectEnd = "June 15, 2021"
let teamType = "Collaboration"
var web3:web3?
var contract:web3.web3contract?
override func viewDidLoad() {
super.viewDidLoad()
// 1. Create wallet using a private key
let formattedKey = privateKey.trimmingCharacters(in: .whitespacesAndNewlines)
let dataKey = Data.fromHex(formattedKey)!
let keyStore = try! EthereumKeystoreV3(privateKey:dataKey, password: password)!
let keyData = try! JSONEncoder().encode(keyStore.keystoreParams)
let address = keyStore.addresses!.first!.address
let wallet = Wallet(address: address, data: keyData, name: walletName, isHD: false)
// 2. Construct web3 and keystoreManager
do {
web3 = try Web3.new(endpoint)
let data = wallet.data
var keystoreManager: KeystoreManager
if wallet.isHD {
let keystore = BIP32Keystore(data)!
keystoreManager = KeystoreManager([keystore])
}else{
let keystore = EthereumKeystoreV3(data)!
keystoreManager = KeystoreManager([keystore])
}
print(keystoreManager.addresses)
web3!.addKeystoreManager(keystoreManager)
let ethContractAddress = EthereumAddress(contractAddress, ignoreChecksum: true)!
contract = web3!.contract(contractABI, at: ethContractAddress, abiVersion: abiVersion)!
}catch{
print ("Failed to construct contract and/or keystoreManager \(error)")
}
// 3. Create and callout a contract method
//let parameters = [projectTitle,projectLocation,projectStart,projectEnd,teamType] as [AnyObject] // parameters used to created a new project
let parameters = [] as [AnyObject] // no parameters
let response = Promise<Any> { seal in
DispatchQueue.global().async {
// Catch errors within async call
do {
// No extra data for method call
let extraData: Data = Data()
// Options for method call
var options = TransactionOptions.defaultOptions
options.from = EthereumAddress(wallet.address)! // current wallet address
// Leave automatic for gas
options.gasPrice = .automatic
options.gasLimit = .automatic
// Calling get Project title from contract
// NOTE: First call setContract with parameters
let tx = self.contract!.method("getProjectTitle",
parameters: parameters,
extraData: extraData,
transactionOptions: options)
// Depending on the type of call a password might be needed
//if password != nil {
//let result = try tx!.send(password: password)
// seal.resolve(.fulfilled(true))
//}else{
let result = try tx!.call()
// fulfill are result from contract
let anyResult = result["0"] as Any
seal.resolve(.fulfilled(anyResult))
//}
}catch {
// error
seal.reject(error)
}
}
}
response.done({result in
print(result) // Optional(HouseSiding)
})
}
}
I've had a look around and although there is some answers which are similar I can't find what I'm specifically looking for.
My data is stored in Firebase (Cloud Firestore) and I need to read that data back which is fine and working. My issue is I have changed the setup of the document file path to further increase security by adding a randomly generated id in the file path.
Firstly, is this possible to add the wildcard into a document path within Xcode? Secondly, could this be perhaps done as a string?
I have added the code below including file path.
Thanks in advance.
class getContactData : ObservableObject{
#Published var datas = [contactDataType]()
#AppStorage("selectedSchool") var selectedSchool: String = "selectedSchool"
init() {
let db = Firestore.firestore()
db.collection("/School Name/\(selectedSchool)/School Assets/**randomPath**/Contact Details").getDocuments { (snap, err) in
if err != nil{
print((err?.localizedDescription)!)
return
}
for i in snap!.documents{
let id = i.documentID
let adno = i.get("ID") as! String
let fullname = i.get("Full Name") as! String
let firstname = i.get("First Name") as! String
let lastname = i.get("Last Name") as! String
let registrationgroup = i.get("Registration Group") as! String
let priority1relation = i.get("Priority 1 Relation") as! String
let priority1fullname = i.get("Priority 1 Full Name") as! String
let priority1maintelephone = i.get("Priority 1 Main Telephone") as! String
let priority1mobile = i.get("Priority 1 Mobile") as! String
let priority2relation = i.get("Priority 2 Relation") as! String
let priority2fullname = i.get("Priority 2 Full Name") as! String
let priority2maintelephone = i.get("Priority 2 Main Telephone") as! String
let priority2mobile = i.get("Priority 2 Mobile") as! String
let priority3relation = i.get("Priority 3 Relation") as! String
let priority3fullname = i.get("Priority 3 Full Name") as! String
let priority3maintelephone = i.get("Priority 3 Main Telephone") as! String
let priority3mobile = i.get("Priority 3 Mobile") as! String
let priority4relation = i.get("Priority 4 Relation") as! String
let priority4fullname = i.get("Priority 4 Full Name") as! String
let priority4maintelephone = i.get("Priority 4 Main Telephone") as! String
let priority4mobile = i.get("Priority 4 Mobile") as! String
self.datas.append(contactDataType(id: id, adno: adno, fullname: fullname, firstname: firstname, lastname: lastname, registrationgroup: registrationgroup, priority1relation: priority1relation, priority1fullname: priority1fullname, priority1maintelephone: priority1maintelephone, priority1mobile: priority1mobile, priority2relation: priority2relation, priority2fullname: priority2fullname, priority2maintelephone: priority2maintelephone, priority2mobile: priority2mobile, priority3relation: priority3relation, priority3fullname: priority3fullname, priority3maintelephone: priority3maintelephone, priority3mobile: priority3mobile, priority4relation: priority4relation, priority4fullname: priority4fullname, priority4maintelephone: priority4maintelephone, priority4mobile: priority4mobile))
}
}
}
}
struct contactDataType : Identifiable {
var id : String
var adno : String
var fullname : String
var firstname : String
var lastname : String
var registrationgroup : String
var priority1relation : String
var priority1fullname : String
var priority1maintelephone : String
var priority1mobile : String
var priority2relation : String
var priority2fullname : String
var priority2maintelephone : String
var priority2mobile : String
var priority3relation : String
var priority3fullname : String
var priority3maintelephone : String
var priority3mobile : String
var priority4relation : String
var priority4fullname : String
var priority4maintelephone : String
var priority4mobile : String
In Firebase, if you add a new .document() without specifying the name of the document, it will create a document with a random generated ID. This is not a wildcard, but it will be a random path.
let firstCollection = "School Name"
let selectedSchool = "Selected School"
let secondCollection = "School Assets"
let thirdCollection = "Contact Details"
// Adding a document:
let newDocument = db.collection(firstCollection).document(selectedSchool).collection(secondCollection).document()
let randomPath = newDocument.documentID // You will need to store this if you need to access it directly later
let finalPath = newDocument.collection(thirdCollection)
finalPath.addDocument(data: ["info" : "info"], completion: nil)
Side note: it's best practice to keep the names of your collections and documents in the database lowercased and without spaces to avoid typing String errors ("School Name" -> "school_name").
Firestore does not support wildcards in queries.
If you want to query all documents among all subcollections named "Contact Details" anywhere in the database, then you can use a collection group query.
db.collectionGroup("Contact Details").getDocuments { (snap, err) in
// ...
}