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‎.gitignore

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# Binaries for programs and plugins
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*.exe
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*.exe~
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*.dll
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*.so
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*.dylib
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# Test binary, build with `go test -c`
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*.test
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# Output of the go coverage tool, specifically when used with LiteIDE
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*.out

‎LICENSE.txt

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MIT License
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Copyright (c) 2019 Max
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.

‎README.md

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# Golang AWS Cognito Register, Verify phone number, Login and Get User example
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This example code demonstrates how to use AWS Cognito with AWS Go SDK in a form of simple web pages where you can:
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1. Check if username is taken
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2. Register
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3. Verify user's phone
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4. Login with username or refresh token
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In order this solution to work, you need to have AWS credentials configured (file `.aws/configuration` exists) and User Pool created in AWS Console. You have to disable "Remember device" and enable "Sms second-factor" on authentication tab.
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You will also need to create App Client in User Pool without "Generate Secret Key" checkbox. When the app client is created, in it's settings select "Enable username-password (non-SRP) flow for app-based authentication (USER_PASSWORD_AUTH)".
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## Build
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Go to `/src` folder and run:
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```go
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go build -o ./build/cognito
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AWS_PROFILE=XXX COGNITO_APP_CLIENT_ID=XXX COGNITO_USER_POOL_ID=XXX ./build/cognito
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```
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Visit http://localhost:8080/register to see the registration page.

‎public/login.html

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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0" />
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<meta http-equiv="X-UA-Compatible" content="ie=edge" />
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<link
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rel="stylesheet"
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href="https://cdn.jsdelivr.net/npm/semantic-ui@2.4.2/dist/semantic.min.css"
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/>
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<title>Login</title>
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<style>
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.holder {
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display: flex;
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align-items: center;
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justify-content: center;
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}
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code {
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font-size: 9px !important;
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overflow-x: scroll;
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}
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</style>
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</head>
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<body class="holder">
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<div class="ui raised text container">
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<div class="column">
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<h1 class="ui header">Login</h1>
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<div class="ui compact message hidden" id="message">
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<p>
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Message goes here...
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</p>
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</div>
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<div class="ui styled fluid accordion">
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<div class="active title">
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<i class="dropdown icon"></i>
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Username / Password
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</div>
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<div class="active content">
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<form class="ui form padded" method="post" action="/login">
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<div class="field">
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<label>Username</label>
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<input
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type="text"
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name="username"
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required
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placeholder="Please enter your username or refresh token"
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/>
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</div>
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<div class="field">
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<label>Password</label>
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<input
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type="password"
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name="password"
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required
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placeholder="Wh4t_i5_your_p@ssw0rd?"
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/>
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</div>
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<button class="ui button" type="submit">Submit</button>
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</form>
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</div>
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<div class="title">
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<i class="dropdown icon"></i>
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Refresh token
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</div>
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<div class="content">
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<form class="ui form padded" method="post" action="/login">
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<div class="field">
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<input type="hidden" name="refresh" value="1" />
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<label>Refresh token</label>
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<input
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type="text"
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name="refresh_token"
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required
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placeholder="Please enter the refresh token"
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/>
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</div>
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<button class="ui button" type="submit">Submit</button>
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</form>
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</div>
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</div>
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<code class="ui compact message hidden" id="authres">
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Message goes here...
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</code>
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</div>
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</div>
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</body>
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<script
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src="https://code.jquery.com/jquery-3.1.1.min.js"
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integrity="sha256-hVVnYaiADRTO2PzUGmuLJr8BLUSjGIZsDYGmIJLv2b8="
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crossorigin="anonymous"
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></script>
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<script src="https://cdn.jsdelivr.net/npm/semantic-ui@2.4.2/dist/semantic.min.js"></script>
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<script>
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$(".ui.accordion").accordion();
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if (document.location.search.includes("error")) {
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const m = document.getElementById("message");
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m.style.display = "block";
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const err = document.location.search.replace("?error=", "");
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m.textContent = decodeURI(err);
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}
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if (document.location.search.includes("authres")) {
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const m = document.getElementById("authres");
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m.style.display = "block";
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const err = document.location.search.replace("?authres=", "");
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m.textContent = decodeURI(err);
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}
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</script>
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</html>

‎public/otp.html

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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0" />
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<meta http-equiv="X-UA-Compatible" content="ie=edge" />
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<link
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rel="stylesheet"
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href="https://cdn.jsdelivr.net/npm/semantic-ui@2.4.2/dist/semantic.min.css"
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/>
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<title>OTP</title>
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<style>
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.holder {
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display: flex;
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align-items: center;
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justify-content: center;
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}
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</style>
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</head>
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<body class="holder">
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<div class="ui raised text container">
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<div class="column">
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<h1 class="ui header">Verify phone number</h1>
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<div class="ui compact message hidden" id="message">
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<p>
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Message goes here...
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</p>
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</div>
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<form class="ui form padded segment" method="post" action="/otp">
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<div class="field">
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<label>One time code</label>
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<input type="text" name="otp" required placeholder="XXXXXX" />
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</div>
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<button class="ui button" type="submit">Submit</button>
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</form>
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</div>
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</div>
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</body>
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<script>
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if (document.location.search.includes("error")) {
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const m = document.getElementById("message");
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m.style.display = "block";
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const err = document.location.search.replace("?error=", "");
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m.textContent = decodeURI(err);
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}
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</script>
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</html>

‎public/register.html

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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0" />
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<meta http-equiv="X-UA-Compatible" content="ie=edge" />
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<link
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rel="stylesheet"
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href="https://cdn.jsdelivr.net/npm/semantic-ui@2.4.2/dist/semantic.min.css"
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/>
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<title>Register</title>
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<style>
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.holder {
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display: flex;
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align-items: center;
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justify-content: center;
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}
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#message {
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display: none
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}
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</style>
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</head>
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<body class="holder">
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<div class="ui raised text container">
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<div class="column">
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<h1 class="ui header">Register</h1>
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<div class="ui compact message" id="message">
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<p>
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An error ocurred during your request.
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</p>
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</div>
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<form class="ui form padded segment" method="post" action="/register">
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<div class="field">
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<label>Username</label>
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<input
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type="text"
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name="username"
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required
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placeholder="User name"
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/>
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</div>
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<div class="field">
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<label>Password</label>
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<input
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type="password"
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name="password"
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required
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placeholder="Password"
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/>
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</div>
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<div class="field">
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<label>Phone number</label>
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<input
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type="text"
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name="phone_number"
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required
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placeholder="+XXXXXXXXXXX"
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/>
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</div>
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<button class="ui button" type="submit">Submit</button>
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</form>
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</div>
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</div>
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</body>
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<script>
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if (document.location.search.includes("error")) {
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const m = document.getElementById("message")
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m.style.display = "block"
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const err = document.location.search.replace("?error=", "")
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m.textContent = decodeURI(err);
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}
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</script>
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</html>

‎public/username.html

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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0" />
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<meta http-equiv="X-UA-Compatible" content="ie=edge" />
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<link
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rel="stylesheet"
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href="https://cdn.jsdelivr.net/npm/semantic-ui@2.4.2/dist/semantic.min.css"
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/>
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<title>Check username</title>
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<style>
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.holder {
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display: flex;
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align-items: center;
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justify-content: center;
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}
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</style>
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</head>
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<body class="holder">
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<div class="ui raised text container">
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<div class="column">
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<h1 class="ui header">Check username</h1>
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<div class="ui compact message hidden" id="message">
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<p>
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Message goes here...
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</p>
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</div>
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<form class="ui form padded segment" method="post" action="/username">
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<div class="field">
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<label>Check if username is taken</label>
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<input type="text" name="username" required placeholder="Please enter the username" />
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</div>
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<button class="ui button" type="submit">Submit</button>
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</form>
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</div>
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</div>
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</body>
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<script>
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if (document.location.search.includes("error")) {
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const m = document.getElementById("message");
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m.style.display = "block";
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const err = document.location.search.replace("?error=", "");
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m.textContent = decodeURI(err);
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}
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</script>
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</html>

‎src/login.go

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package main
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import (
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"fmt"
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"net/http"
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"github.com/aws/aws-sdk-go/aws"
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cognito "github.com/aws/aws-sdk-go/service/cognitoidentityprovider"
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)
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const flowUsernamePassword = "USER_PASSWORD_AUTH"
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const flowRefreshToken = "REFRESH_TOKEN_AUTH"
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// Login handles login scenario.
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func (c *CognitoExample) Login(w http.ResponseWriter, r *http.Request) {
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r.ParseForm()
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username := r.Form.Get("username")
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password := r.Form.Get("password")
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refresh := r.Form.Get("refresh")
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refreshToken := r.Form.Get("refresh_token")
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flow := aws.String(flowUsernamePassword)
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params := map[string]*string{
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"USERNAME": aws.String(username),
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"PASSWORD": aws.String(password),
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}
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if refresh != "" {
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flow = aws.String(flowRefreshToken)
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params = map[string]*string{
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"REFRESH_TOKEN": aws.String(refreshToken),
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}
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}
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authTry := &cognito.InitiateAuthInput{
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AuthFlow: flow,
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AuthParameters: params,
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ClientId: aws.String(c.AppClientID),
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}
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res, err := c.CognitoClient.InitiateAuth(authTry)
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if err != nil {
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fmt.Println(err)
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http.Redirect(w, r, fmt.Sprintf("/login?error=%s", err.Error()), http.StatusSeeOther)
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return
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}
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http.Redirect(w, r, fmt.Sprintf("/login?authres=%s", res.AuthenticationResult), http.StatusFound)
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}

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