From de31580bbb08d17534536c751970db4ea22b98a7 Mon Sep 17 00:00:00 2001 From: Naman Singla <75626821+nsingla20@users.noreply.github.com> Date: Fri, 28 May 2021 20:15:52 +0530 Subject: [PATCH] Added Assignment 3 --- Naman Singla/Assignment 3/demo.py | 105 +++++++++++++++++++++++++++ Naman Singla/Assignment 3/index.html | 37 ++++++++++ Naman Singla/Assignment 3/script.js | 58 +++++++++++++++ 3 files changed, 200 insertions(+) create mode 100644 Naman Singla/Assignment 3/demo.py create mode 100644 Naman Singla/Assignment 3/index.html create mode 100644 Naman Singla/Assignment 3/script.js diff --git a/Naman Singla/Assignment 3/demo.py b/Naman Singla/Assignment 3/demo.py new file mode 100644 index 0000000..a22ea34 --- /dev/null +++ b/Naman Singla/Assignment 3/demo.py @@ -0,0 +1,105 @@ +import os +from flask import Flask, request, jsonify, make_response + +app = Flask(__name__) + +tokens = [] +user_data = {} + +help_info = ''' +
+This application has following endpoints:
+/           -->   Returns information about different endpoints
+/get_token  -->   A GET request at this endpoint return a token. Return format:
+                  {
+                      "token" : ""
+                  }
+/register   -->   A POST request at this endpoint saves user data. The request data should be in following format:
+                  {
+                      "username" : "",
+                      "data" : "",
+                      "token" : ""
+                  }
+                  This endpoint does not return any data on successful completion.
+/get_data   -->   A POST request at this endpoint return user data corresponding to a token. The request format is:
+                  {
+                      "token" : ""
+                  }
+                  On successful completion, the return data is in following format:
+                  {
+                      "username" : ""
+                      "data" : ""
+                  }
+
+On succcessful completion, the response code is set to be 200.
+For /register and /get_data endpoints, if there is some error(i.e. response code is not 200) then the format of return data is:
+                   {
+                       "error" : ""
+                   }
+
+''' + +def add_header(inp): + resp = make_response(inp) + resp.headers['Access-Control-Allow-Origin'] = "*" + return resp + +@app.route("/") +def index(): + return add_header(help_info), 200 + +@app.route("/get_token", methods = ['GET']) +def generate_token(): + global tokens + token = os.urandom(8).hex() + tokens.append(token) + return add_header(jsonify(token = token)), 200 + +@app.route("/register", methods = ['POST', 'OPTIONS']) +def save_data(): + global user_data + if request.method == 'OPTIONS': + resp = make_response() + resp.headers['Access-Control-Allow-Origin'] = "*" + resp.headers['Access-Control-Allow-Methods'] = "POST, OPTIONS" + resp.headers['Access-Control-Allow-Headers'] = "*" + return resp, 204 + + if request.content_type != 'application/json': + return add_header(jsonify(error = "json format required")), 400 + json_data = request.json + if "token" not in json_data: + return add_header(jsonify(error = "token value missing")), 400 + if "username" not in json_data: + return add_header(jsonify(error = "username field missing")), 400 + if "data" not in json_data: + return add_header(jsonify(error = "data field missing")), 400 + if not json_data["token"] in tokens: + return add_header(jsonify(error = "invalid token value")), 404 + if json_data["token"] in user_data.keys(): + return add_header(jsonify(error = "a user already registered for this token value")), 400 + user_data[json_data["token"]] = {"username" : json_data["username"], "data" : json_data["data"]} + return add_header("User added successfully"), 200 + +@app.route("/get_data", methods = ['POST', 'OPTIONS']) +def send_data(): + if request.method == 'OPTIONS': + resp = make_response() + resp.headers['Access-Control-Allow-Origin'] = "*" + resp.headers['Access-Control-Allow-Methods'] = "POST, OPTIONS" + resp.headers['Access-Control-Allow-Headers'] = "*" + return resp, 204 + + if request.content_type != 'application/json': + return add_header(jsonify(error = "json format required")), 400 + json_data = request.json + if "token" not in json_data: + return add_header(jsonify(error = "token value missing")), 400 + if not json_data["token"] in tokens: + return add_header(jsonify(error = "invalid token")), 404 + if not json_data["token"] in user_data.keys(): + return add_header(jsonify(error = "no user registered with this token")), 404 + return add_header(jsonify(**user_data[json_data["token"]])), 200 + +if __name__ == "__main__": + app.run(debug = True, port = 12345) \ No newline at end of file diff --git a/Naman Singla/Assignment 3/index.html b/Naman Singla/Assignment 3/index.html new file mode 100644 index 0000000..7971d01 --- /dev/null +++ b/Naman Singla/Assignment 3/index.html @@ -0,0 +1,37 @@ + + + Server + + + + + + + + + + + + + + + + + + + + +
RegisterLogin

+
+ + 		+
+ +
+ + + \ No newline at end of file diff --git a/Naman Singla/Assignment 3/script.js b/Naman Singla/Assignment 3/script.js new file mode 100644 index 0000000..27d8831 --- /dev/null +++ b/Naman Singla/Assignment 3/script.js @@ -0,0 +1,58 @@ +function getToken(){ + var xhttp = new XMLHttpRequest(); + xhttp.onreadystatechange = function() { + if (this.readyState == 4 && this.status == 200) { + document.getElementById("token1").value=JSON.parse(xhttp.responseText).token; + alert("Your Token is : "+JSON.parse(xhttp.responseText).token); + } + }; + xhttp.open("GET","http://localhost:12345/get_token",true); + xhttp.send(); +} +function Register(){ + var xhttp = new XMLHttpRequest(); + + xhttp.onreadystatechange = function() { + //alert(xhttp.responseText); + if (this.readyState == 4) { + if(this.status==200){ + alert(xhttp.responseText); + }else{ + alert("Sorry, an error occured :\n"+JSON.parse(xhttp.responseText).error); + } + } + }; + var obj = new Object(); + obj.username=String(document.getElementById("username").value); + obj.data=String(document.getElementById("data").value); + obj.token=String(document.getElementById("token1").value); + xhttp.open("POST","http://localhost:12345/register",true); + xhttp.setRequestHeader("Content-Type","application/json"); + xhttp.send(JSON.stringify(obj)); +} +function GetData(){ + document.getElementById("user2").value=""; + document.getElementById("dat2").value=""; + var xhttp = new XMLHttpRequest(); + xhttp.onreadystatechange = function() { + if (this.readyState == 4) { + var res = JSON.parse(xhttp.responseText); + if(res.error)alert(res.error); + if(this.status=200){ + + document.getElementById("user2").value=res.username; + document.getElementById("dat2").value=res.data; + } + } + + }; + xhttp.open("POST","http://localhost:12345/get_data",true); + xhttp.setRequestHeader("Content-Type","application/json"); + var tok=new Object(); + tok.token=document.getElementById("token2").value; + xhttp.send(JSON.stringify(tok)); + +} +document.getElementById("get_token").addEventListener("click", getToken); +document.getElementById("register").addEventListener("click", Register); +document.getElementById("get_data").addEventListener("click", GetData); \ No newline at end of file