We Keep Coding

How to specify arguments for a Python api using Kotlin?

I made a python api that I'm trying to get my app to connect to, but for the login function I need to send the username and password but I'm not sure how to do this. This is the python code:
username = data.get('username')
email = data.get('email')
password = data.get('password')
And the Kotlin Code:
private fun sendData(username:String, password:String): Thread {
return Thread {
val url = URL("https://127.0.0.1:5000/login")
val connection = url.openConnection() as HttpsURLConnection
connection.setRequestProperty("username", username)
connection.setRequestProperty("password", password)
if (connection.responseCode == 200) {
val inputSystem = connection.inputStream
println(inputSystem.toString())
Toast.makeText(applicationContext, "It worked", Toast.LENGTH_SHORT).show()
}
else {
var code: String = "ERROR"
Toast.makeText(applicationContext, "NO CONNECTION", Toast.LENGTH_SHORT).show()
}
}
}
The connection is opened but I can get any data across and I haven't tried anything so far as I can't find good documentation on this.

You could, for example, first set up a class to handle your credentials:
class LoginData(
val userID: String,
val pw: String
){
/** Returns a hashmap of the data stored in the class object. */
fun getHashmap(): Map<String,String> {
val params = HashMap<String,String>()
params["username"] = userID
params["password"] = pw
return params
}
/** Obtains a JSONObject of the data stored in the class object. */
fun getJson(): JSONObject {
val params = this.getHashmap()
return JSONObject(params)
}
}
And then, utilising Volley (don't forget to add it to your build gradle: implementation 'com.android.volley:volley:1.2.0'), do something like this:
fun sendData(username: String?, password: String?) {
val url = "https://127.0.0.1:5000/login"
var loginData = LoginData(
userID = username!!,
pw = password!!
)
val queue = Volley.newRequestQueue(this)
val jsonRequest = JsonObjectRequest(
Request.Method.POST,
url,
loginData.getJson(),
Response.Listener {
response -> handleResponse(response)//do something with the response
},
Response.ErrorListener { error -> println("That didn't work: $error")})
queue.add(jsonRequest)
}
with handleResponse() containing your logic to evaluate what comes back from the server:
fun handleResponse(response: JSONObject) {
//your evaluation logic
}

im grtting an error called (send_login_otp failure - module 'requests' has no attribute 'post4')

first i taut i have multiple file usig same name but i anable to find the file so, i tried using create new virtual env but i got same error .even i tried to upgrade the package but noting works .
here is my code
import requests
def verify_totp(request_key, totp):
try:
payload = {
"request_key": request_key,
"otp": totp
}
result_string = requests.post4(url=URL_VERIFY_TOTP, json=payload)
if result_string.status_code != 200:
return [ERROR, result_string.text]
result = json.loads(result_string.text)
request_key = result["request_key"]
return [SUCCESS, request_key]

It should be requests.post not requests.post4
Also check your try block and indentation.
def verify_totp(request_key, totp):
# you can avoid the use of a `try except`block if you don't use it
payload = {
"request_key": request_key,
"otp": totp
}
result_string = requests.post(url=URL_VERIFY_TOTP, json=payload)
if result_string.status_code != 200:
return ["ERROR", result_string.text]
result = json.loads(result_string.text)
request_key = result["request_key"]
return ["SUCCESS", request_key]
request_key = "<INSERT YOUR REQUEST KEY HERE>"
totp = "<INSERT YOUR TOTP HERE>"
request_status, request_key = verify_totp(request_key, totp)
print(request_status, request_key)

How to Connect an ios App With mysql Database Using Python Instead of PHP

I'm trying to access a mysql database inside an ios app and I would like to use python to read and write to the database when called from my app.
PHP Code I would like to turn into a python script
I am not sure how to write or read data from my application using mysql-connector.
I believe this is done with the $_POST[a]; but I am not sure how to get the same results using python.
I also have a sample of how I am trying to send data from my app to my database written in swiftui.
'''
import Foundation
import SwiftUI
struct CreateEventButton: View {
#State private var isPresentedEvent = false
#State private var eventid: Int = 0
#State private var eventName: String = ""
#State private var eventDescription: String = ""
#State private var selectedStartTime = Date()
#State private var selectedEndTime = Date()
#Binding var annotationSelected: Bool
func send(_ sender: Any) {
let request = NSMutableURLRequest(url: NSURL(string: "http://YOUR FILE PATH")! as URL)
request.httpMethod = "POST"
let postString = "a=\(self.eventid)&b=\(self.eventName)&=c\(self.eventDescription)&=d\(self.selectedStartTime)&=e\(self.selectedEndTime)"
request.httpBody = postString.data(using: String.Encoding.utf8)
let task = URLSession.shared.dataTask(with: request as URLRequest) {
data, response, error in
if error != nil {
print("error=\(String(describing: error))")
return
}
print("response = \(String(describing: response))")
let responseString = NSString(data: data!, encoding: String.Encoding.utf8.rawValue)
print("responseString = \(String(describing: responseString))")
}
task.resume()
self.eventName = ""
self.eventDescription = ""
self.selectedStartTime = Date()
self.selectedEndTime = Date()
}
var body: some View {
Button(action: {
self.isPresentedEvent.toggle() //trigger modal
}, label: {
Text("Create Event")})
.foregroundColor(.secondary)
.background(Color(.secondarySystemBackground))
.cornerRadius(50.0)
.sheet(isPresented: $isPresentedEvent, content:{
VStack{
TextField("Event Name", text: self.$eventName).padding()
TextField("Event Description", text: self.$eventDescription).padding()
Form {
DatePicker("When your event starts: ", selection: self.$selectedStartTime, in: Date()...)
}
Form {
DatePicker("When your event ends: ", selection: self.$selectedEndTime, in: Date()...)
}
HStack{
Button(action: {
self.isPresentedEvent.toggle()
self.annotationSelected = false
self.eventid += 1
print("Start: \(self.selectedStartTime)")
print("End: \(self.selectedEndTime)")
//send()
}, label: {
Text("Create Event")
})
Button(action: {
self.isPresentedEvent.toggle()
}, label: {
Text("Cancel")
})
}
Text("Create Event Button (Non Functional)").padding()
}
} )
}
}
'''
I am not sure what parameters to put in the sender function created here.
Any insight would be greatly appreciated.

In order to receive POST requests from the SwiiftUI app, you need to run a python webserver like flask.
1. Create a python module (file) something like this:
app.py
from flask import Flask
from flask import make_response
import mysql.connector
from flask import request
server_name = "localhost"
username = "flask"
password = "flask"
dbname = "flask"
# Create and check connection
try:
conn = mysql.connector.connect(
host=server_name,
user=username,
passwd=password,
database=dbname
)
print("Connection OK")
except e:
print("Connection failed: ", e)
mycursor = conn.cursor()
app = Flask(__name__)
#app.route('/', methods=['POST'])
def register():
name = request.form['a']
age = request.form['b']
sql = "INSERT INTO users (name, age) VALUES (%s, %s)"
val = (name, age)
try:
mycursor.execute(sql, val)
conn.commit()
conn.close()
except e:
print("Error: ", e)
return make_response("Success!", 200)
2. Make sure you have the necessary libraries installed:
pip install flask
pip install mysql-connector-python
You need to make sure your MySQL database is up and that you fill in the real credentials for the database in the code. (Default MySQL port = 3306)
3. Start the flask development webserver
export FLASK_APP=app.py # OR set FLASK_APP=app.py (for Windows)
python -m flask run
Your server should start at: http://localhost:5000
Replace: http://YOUR FILE PATH with http://localhost:5000/ in your swift code example and viola!
UPDATE: I tested this and it works. Here is the swiftUI code I generated in postman:
import Foundation
var semaphore = DispatchSemaphore (value: 0)
let parameters = "a=Lance&b=35"
let postData = parameters.data(using: .utf8)
var request = URLRequest(url: URL(string: "http://localhost:5000/")!,timeoutInterval: Double.infinity)
request.addValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type")
request.httpMethod = "POST"
request.httpBody = postData
let task = URLSession.shared.dataTask(with: request) { data, response, error in
guard let data = data else {
print(String(describing: error))
return
}
print(String(data: data, encoding: .utf8)!)
semaphore.signal()
}
task.resume()
semaphore.wait()

TypeError: Unicode-objects must be encoded before hashing in python for azure iot hub

I'm trying to upload some data from rasberry pi to azure iot hub, I'm facing this problem,Where do I need to set the encoding/charsets?
I've tried data.encode('utf-8') something like that but not working.
Might be someone asked, please help me with this specific code.
I'm following this link.
def generate_sas_token():
expiry=3600
ttl = time.time() + expiry
sign_key = "%s\n%d" % ((quote_plus(URI)), int(ttl))
signature = b64encode(HMAC(b64decode(KEY), sign_key, sha256).digest())
rawtoken = {
'sr' : URI,
'sig': signature,
'se' : str(int(ttl))
}
rawtoken['skn'] = POLICY
return 'SharedAccessSignature ' + urlencode(rawtoken)
def send_message(token, message):
url = 'https://{0}/devices/{1}/messages/events?api-version=2016-11-14'.format(URI, IOT_DEVICE_ID)
headers = {
"Content-Type": "application/json",
"Authorization": token
}
data = json.dumps(message)
print(data)
#data.encode('utf-8')
response = requests.post(url, data=data, headers=headers)
if __name__ == '__main__':
# 2. Generate SAS Token
token = generate_sas_token()
# 3. Send Temperature to IoT Hub
while True:
#temp = read_temp()
message = { "temp": str("12") }
send_message(token, message)
time.sleep(1)
And the error is
Traceback (most recent call last):
File "/home/pi/python/test.py", line 45, in <module>
token = generate_sas_token()
File "/home/pi/python/test.py", line 20, in generate_sas_token
signature = b64encode(HMAC(b64decode(KEY), sign_key, sha256).digest())
File "/usr/lib/python3.5/hmac.py", line 84, in __init__
self.update(msg)
File "/usr/lib/python3.5/hmac.py", line 93, in update
self.inner.update(msg)
TypeError: Unicode-objects must be encoded before hashing

The error tells you must encode before creating your HMAC object. It seems you are decoding it first :
HMAC(b64decode(KEY), sign_key, sha256)

A possible solution could be:
HMAC(b64decode(KEY), sign_key.encode('utf-8'), sha256)

Can not read JSON returned array in Swift like Python enumerate

I am trying to replicate the following lines of python code from the https://github.com/joshfraser/robinhood-to-csv repo from GitHub in order to read my transaction history.
orders = robinhood.get_endpoint('orders')
paginated = True
page = 0
while paginated:
for i, order in enumerate(orders['results']):
executions = order['executions']
instrument = robinhood.get_custom_endpoint(order['instrument'])
fields[i + (page * 100)]['symbol'] = instrument['symbol']
for key, value in enumerate(order):
if value != "executions":
fields[i + (page * 100)][value] = order[value]
if order['state'] == "filled":
trade_count += 1
for key, value in enumerate(executions[0]):
fields[i + (page * 100)][value] = executions[0][value]
elif order['state'] == "queued":
queued_count += 1
# paginate
if orders['next'] is not None:
page = page + 1
orders = robinhood.get_custom_endpoint(str(orders['next']))
else:
paginated = False
Where we also have
def get_endpoint(self, endpoint=None):
res = self.session.get(self.endpoints[endpoint])
return json.loads(res.content.decode('utf-8'))
I have thus been working on the following iOS code. I work with this code in an XCode playground so feel free to make one to follow along
import UIKit
import PlaygroundSupport
let LoginEndpoint:String = "https://api.robinhood.com/api-token-auth/"
let LoginRequestData:[String : String] = ["username": "EmailAdress", "password": "Password"]
let OrdersEndpoint:String = "https://api.robinhood.com/orders/"
func httpReq(type: String, url: String, body:[String : String], header:[String : String]) -> ([String : Any]?, Data?, String?){
let url = URL(string: url)
var returnData:([String : Any]?, Data?, String?)? = nil
if let url = url {
var request = NSMutableURLRequest(url: url) as URLRequest
request.httpMethod = type
var postString = ""
for (key, value) in body {
if (postString != "") {
postString += "&"
}
postString += "\(key)=\(value)"
}
request.httpBody = postString.data(using: .utf8)
for (key, value) in header {
request.addValue(value, forHTTPHeaderField: key)
}
let _ = URLSession.shared.dataTask(with: request, completionHandler: {(data, response, error) in
if let data = data {
do {
let jsonSerialized = try JSONSerialization.jsonObject(with: data, options: []) as? [String : Any]
returnData = (jsonSerialized, data, nil)
} catch (_) {
returnData = (nil, data, "JSON Parse Erro")
}
} else if let error = error {
returnData = (nil, nil, error.localizedDescription)
}
}).resume()
}
while (returnData == nil) {}
return returnData!
}
let tokenQuery = httpReq(type: "POST", url: LoginEndpoint, body: LoginRequestData, header: [:])
if let token = tokenQuery.0?["token"] {
print("token \(token)")
let historyQuery = httpReq(type: "GET", url: OrdersEndpoint, body: [:], header: ["Authorization": "Token \(token)"])
if let results = historyQuery.0?["results"], let countString = historyQuery.0?["count"] {
}
}
RunLoop.main.run()
PlaygroundPage.current.needsIndefiniteExecution = true
So as you can see I am using the auth token to get to the orders endpoint. I am indeed getting a good response from the orders endpoint but I have no clue how to interpret it.
It would seem from the python code that it is returning an array of JSON objects however I cant figure out how to get to that array in swift. I am not even sure if I am decoding it properly. The funny thing is when you look at the object returned in Playgrounds it would seem XCode knows that there is an array going on. How do I get to it?

Can't really get a good idea of the information being returned by your service, because of the lack of credentials.
However, check out SwiftyJSON. It's a really good library, and is extremely helpful with handling JSON data in Swift. It should solve your JSON handling issues.