Refactored StegoEntry, added blazor example

.github/workflows/ci-build-and-test.yml

@@ -1,10 +1,11 @@
+---
 name: Build and Test
 
 on:
   push:
-    branches: [ "master" ]
+    branches: ["master"]
   pull_request:
-    branches: [ "master" ]
+    branches: ["master"]
 
 jobs:
   build-and-test:
@@ -13,14 +14,14 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v3
-    - name: Setup .NET
-      uses: actions/setup-dotnet@v3
-      with:
-        dotnet-version: 7.0.x
-    - name: Restore dependencies
-      run: dotnet restore
-    - name: Build
-      run: dotnet build --no-restore
-    - name: Test
-      run: dotnet test --no-build --verbosity normal
+      - uses: actions/checkout@v3
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v3
+        with:
+          dotnet-version: 7.0.x
+      - name: Restore dependencies
+        run: dotnet restore
+      - name: Build
+        run: dotnet build --no-restore
+      - name: Test
+        run: dotnet test --no-build --verbosity normal

.github/workflows/linter.yml

@@ -1,24 +1,24 @@
+---
 name: Lint Code
 
 on:
   push:
-    branches: [ "master" ]
+    branches: ["master"]
   pull_request:
-    branches: [ "master" ]
+    branches: ["master"]
 jobs:
   run-lint:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
         uses: actions/checkout@v3
         with:
-          # Full git history is needed to get a proper list of changed files within `super-linter`
           fetch-depth: 0
 
       - name: Lint Code Base
         uses: github/super-linter@v4
         env:
           VALIDATE_ALL_CODEBASE: true
-          FILTER_REGEX_EXCLUDE: .*tests/.*|.*\.csproj|.*\.sln
+          FILTER_REGEX_EXCLUDE: .*tests/.*|.*\.csproj|.*\.sln|.*examples/.*
           DEFAULT_BRANCH: "master"
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

examples/StegoBlazorApp/App.razor

@@ -0,0 +1,12 @@
+<Router AppAssembly="@typeof(App).Assembly">
+    <Found Context="routeData">
+        <RouteView RouteData="@routeData" DefaultLayout="@typeof(MainLayout)" />
+        <FocusOnNavigate RouteData="@routeData" Selector="h1" />
+    </Found>
+    <NotFound>
+        <PageTitle>Not found</PageTitle>
+        <LayoutView Layout="@typeof(MainLayout)">
+            <p role="alert">Sorry, there's nothing at this address.</p>
+        </LayoutView>
+    </NotFound>
+</Router>

examples/StegoBlazorApp/Pages/Decode.razor

@@ -0,0 +1,70 @@
+@page "/decode"
+@using System.IO
+@using Microsoft.AspNetCore.Components.Forms
+
+<div class="container">
+    <div class="row">
+        <InputFile OnChange="HandleSelected" accept=".jpg,.jpeg,.png,.bmp" />
+    </div>
+    <div class="row">
+        <div class="col-md">
+            @if (imageBase64 != null)
+            {
+                <div>
+                    <img src="@imageBase64" />
+                </div>
+                <div class="d-flex justify-content-center mt-2">
+                    <button class="btn btn-primary" @onclick="Decrypt">Decrypt</button>
+                </div>
+
+            }
+        </div>
+        <div class="col-md">
+            <div class="h-100 d-flex flex-column align-items-center justify-content-center">
+                @if (secret != null)
+                {
+                    <div>
+                        <p>Your secret</p>
+                    </div>
+                    <input class="form-control" type="text" value="@secret" readonly>
+                }
+            </div>
+        </div>
+    </div>
+
+</div>
+
+@code {
+    private string? imageBase64;
+    private byte[]? imageBytes;
+
+    private string? secret;
+
+    private async Task HandleSelected(InputFileChangeEventArgs e)
+    {
+        var imageFile = e.File;
+        if (imageFile != null)
+        {
+            using MemoryStream ms = new();
+            using var stream = imageFile.OpenReadStream();
+            await stream.CopyToAsync(ms);
+            imageBytes = ms.ToArray();
+            imageBase64 = $"data:image/png;base64,{Convert.ToBase64String(imageBytes)}";
+        }
+    }
+
+    private void Decrypt()
+    {
+        if (imageBytes == null)
+        {
+            return;
+        }
+
+        using var stream = new MemoryStream(imageBytes);
+        using var stego = new StegoCore.Stego(stream);
+        var result = stego.Decode(StegoCore.Algorithms.AlgorithmEnum.Lsb);
+
+        // convert result to string
+        secret = System.Text.Encoding.UTF8.GetString(result);
+    }
+}

examples/StegoBlazorApp/Pages/Embed.razor

@@ -0,0 +1,93 @@
+@page "/embed"
+@using System.IO
+@using Microsoft.AspNetCore.Components.Forms
+@inject IJSRuntime JS
+
+<div class="container">
+    <div class="row">
+        <InputFile OnChange="HandleSelected" accept=".jpg,.jpeg,.png,.bmp" />
+    </div>
+    <div class="row">
+            <div class="col-md">
+                @if (imageBase64 != null)
+                {
+                    <div>
+                        <img src="@imageBase64" />
+                    </div>
+                    <div class="d-flex justify-content-center mt-2">
+                        <input type="text" @bind="secret" id="secret" placeholder="Enter your secret" class="m-2" />
+                        <button class="btn btn-primary m-2" @onclick="Encrypt">Encrypt</button>
+                    </div>
+
+                }
+            </div>
+            <div class="col-md">
+                @if (imageEncrypted != null)
+                {
+                    <img src="@imageEncrypted" />
+                    <div class="d-flex justify-content-center mt-2">
+                        <button class="btn btn-primary" @onclick="Download">Download</button>
+                    </div>
+                }
+            </div>
+    </div>
+
+</div>
+
+@code {
+    private string? imageBase64;
+    private byte[]? imageBytes;
+    private string? secret;
+    private byte[]? imageEncryptedBytes;
+    private string? imageEncrypted;
+
+
+    private async Task HandleSelected(InputFileChangeEventArgs e)
+    {
+        var imageFile = e.File;
+        if (imageFile != null)
+        {
+            using MemoryStream ms = new();
+            var format = "image/png";
+            using var stream = imageFile.OpenReadStream();
+            await stream.CopyToAsync(ms);
+            imageBytes = ms.ToArray();
+            imageBase64 = $"data:{format};base64,{Convert.ToBase64String(imageBytes)}";
+        }
+    }
+
+    private async Task Encrypt()
+    {
+        if (secret is null || imageBytes is null)
+        {
+            return;
+        }
+
+        var secretData = System.Text.Encoding.UTF8.GetBytes(secret);
+        using (var stream = new MemoryStream(imageBytes))
+        {
+            using (var stego = new StegoCore.Stego(stream))
+            {
+                var imageWithSecret = stego.Embed(new StegoCore.Core.SecretData(secretData), StegoCore.Algorithms.AlgorithmEnum.Lsb);
+                using var outputStream = new MemoryStream();
+                await imageWithSecret.SaveAsync(outputStream, new SixLabors.ImageSharp.Formats.Png.PngEncoder());
+                imageEncryptedBytes = outputStream.ToArray();
+                imageEncrypted = $"data:image/png;base64,{Convert.ToBase64String(imageEncryptedBytes)}";
+            }
+        }
+    }
+
+    private async Task Download()
+    {
+        if (imageEncryptedBytes is null)
+        {
+            return;
+        }
+
+        var stream = new MemoryStream(imageEncryptedBytes);
+
+        using var streamRef = new DotNetStreamReference(stream: stream);
+
+        await JS.InvokeVoidAsync("downloadFileFromStream", "encrypted.png", streamRef);
+    }
+}

examples/StegoBlazorApp/Pages/Error.cshtml

@@ -0,0 +1,42 @@
+@page
+@model StegoBlazorApp.Pages.ErrorModel
+
+<!DOCTYPE html>
+<html lang="en">
+
+<head>
+    <meta charset="utf-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no" />
+    <title>Error</title>
+    <link href="~/css/bootstrap/bootstrap.min.css" rel="stylesheet" />
+    <link href="~/css/site.css" rel="stylesheet" asp-append-version="true" />
+</head>
+
+<body>
+    <div class="main">
+        <div class="content px-4">
+            <h1 class="text-danger">Error.</h1>
+            <h2 class="text-danger">An error occurred while processing your request.</h2>
+
+            @if (Model.ShowRequestId)
+            {
+                <p>
+                    <strong>Request ID:</strong> <code>@Model.RequestId</code>
+                </p>
+            }
+
+            <h3>Development Mode</h3>
+            <p>
+                Swapping to the <strong>Development</strong> environment displays detailed information about the error that occurred.
+            </p>
+            <p>
+                <strong>The Development environment shouldn't be enabled for deployed applications.</strong>
+                It can result in displaying sensitive information from exceptions to end users.
+                For local debugging, enable the <strong>Development</strong> environment by setting the <strong>ASPNETCORE_ENVIRONMENT</strong> environment variable to <strong>Development</strong>
+                and restarting the app.
+            </p>
+        </div>
+    </div>
+</body>
+
+</html>

examples/StegoBlazorApp/Pages/Error.cshtml.cs

@@ -0,0 +1,26 @@
+using System.Diagnostics;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Mvc.RazorPages;
+
+namespace StegoBlazorApp.Pages;
+
+[ResponseCache(Duration = 0, Location = ResponseCacheLocation.None, NoStore = true)]
+[IgnoreAntiforgeryToken]
+public class ErrorModel : PageModel
+{
+    public string? RequestId { get; set; }
+
+    public bool ShowRequestId => !string.IsNullOrEmpty(RequestId);
+
+    private readonly ILogger<ErrorModel> _logger;
+
+    public ErrorModel(ILogger<ErrorModel> logger)
+    {
+        _logger = logger;
+    }
+
+    public void OnGet()
+    {
+        RequestId = Activity.Current?.Id ?? HttpContext.TraceIdentifier;
+    }
+}

examples/StegoBlazorApp/Pages/Index.razor

@@ -0,0 +1,7 @@
+@page "/"
+
+<PageTitle>Index</PageTitle>
+
+<h1>Hello from StegoCore!</h1>
+
+This example show how to use StegoCore library