Flickr.Net

A modern, fully-featured .NET client library for the Flickr API with dependency injection, IHttpClientFactory integration, and optional HybridCache support.

✨ Features

• 🖼️ Photo Management - Upload, download, search, and organize photos
• 📚 Albums & Collections - Create and manage photo albums and collections
• 🎨 Galleries - Browse and interact with Flickr galleries
• 👥 User Management - Access user profiles, contacts, and favorites
• 🔍 Advanced Search - Powerful search capabilities with filtering
• 🏷️ Tags & Metadata - Full support for tags, EXIF data, and metadata
• 🔐 OAuth Authentication - Secure authentication with OAuth 1.0a
• ⚡ Async/Await - Modern async API throughout
• 📦 Strongly Typed - Type-safe API with comprehensive models
• 💉 Dependency Injection - First-class DI support with IHttpClientFactory
• 🗄️ Optional Caching - Opt-in response caching via HybridCache

📦 Installation

Install via NuGet Package Manager:

dotnet add package Flickr.Net

Or via Package Manager Console:

Install-Package Flickr.Net

🚀 Quick Start

With Dependency Injection (recommended)

// Program.cs
services.AddFlickr(o =>
{
    o.ApiKey = "your-api-key";
    o.SharedSecret = "your-shared-secret";
});

// Optional: enable response caching
services.AddFlickrCaching();

// Inject IFlickrClient anywhere
public class PhotoService(IFlickrClient flickr)
{
    public async Task<Photo> GetPhotoAsync(string id, CancellationToken ct)
    {
        return await flickr.Photos.GetInfoAsync(id, ct);
    }
}

Without DI

using var flickr = new FlickrClient("your-api-key", "your-shared-secret");

🔐 Authentication

// 1. Get a request token
var requestToken = await flickr.OAuth.GetRequestTokenAsync("https://your-callback-url");

// 2. Send user to Flickr authorization page
var authUrl = $"https://www.flickr.com/services/oauth/authorize?oauth_token={requestToken.Token}";

// 3. After user authorizes, exchange for access token
var accessToken = await flickr.OAuth.GetAccessTokenAsync(requestToken, "verifier-code");

// 4. Store and set the tokens for future requests
flickr.FlickrSettings.OAuthAccessToken = accessToken.Token;
flickr.FlickrSettings.OAuthAccessTokenSecret = accessToken.TokenSecret;

🔍 Search Photos

var options = new PhotoSearchOptions
{
    Text = "sunset",
    Tags = "nature,landscape",
    PerPage = 20,
    Extras = PhotoSearchExtras.DateTaken | PhotoSearchExtras.Description
};

var photos = await flickr.Photos.SearchAsync(options);

foreach (var photo in photos)
{
    Console.WriteLine($"{photo.Title} by {photo.OwnerName}");
}

🖼️ Upload Photos

await using var stream = File.OpenRead("photo.jpg");
var photoId = await flickr.Upload.UploadPictureAsync(
    stream,
    "photo.jpg",
    title: "Sunset at the beach",
    tags: "sunset beach vacation",
    isPublic: true);

📚 Manage Albums

// Create an album
var album = await flickr.Photosets.CreateAsync("Vacation 2024", "primary-photo-id");

// Add photos to album
await flickr.Photosets.AddPhotoAsync(album.PhotosetId, "photo-id");

// Get album photos
var albumPhotos = await flickr.Photosets.GetPhotosAsync(album.PhotosetId);

⭐ Favorites

// Add to favorites
await flickr.Favorites.AddAsync("photo-id");

// Get user's favorites
var favorites = await flickr.Favorites.GetListAsync();

// Remove from favorites
await flickr.Favorites.RemoveAsync("photo-id");

💬 Comments & Notes

// Add a comment
var commentId = await flickr.PhotosComments.AddCommentAsync("photo-id", "Great photo!");

// Get all comments
var comments = await flickr.PhotosComments.GetListAsync("photo-id");

// Add a note to a photo
await flickr.PhotosNotes.AddAsync("photo-id", 100, 100, 50, 50, "This is a note");

📋 API Areas

IFlickrClient organizes the Flickr API into sub-clients:

flickr.Photos          // Search, get info, manage photos
flickr.Photosets        // Albums / photosets
flickr.People           // User profiles, find by email/username
flickr.Favorites        // Add, remove, list favorites
flickr.Groups           // Browse and manage groups
flickr.GroupsPools       // Group photo pools
flickr.Tags             // Tag management and search
flickr.Galleries        // Gallery operations
flickr.Contacts         // Contact management
flickr.Upload           // Upload and replace photos
flickr.OAuth            // OAuth 1.0a authentication flow
flickr.Stats            // View counts and referrers
flickr.Places           // Place and location search
flickr.PhotosComments   // Photo comments
flickr.PhotosGeo        // Geolocation data
flickr.PhotosNotes      // Photo annotations
flickr.Interestingness  // Interesting photos
flickr.MachineTags      // Machine tag operations
// ... and more

🗄️ Caching

Response caching is opt-in via HybridCache:

// Basic in-memory caching
services.AddFlickrCaching();

// With custom expiration
services.AddFlickrCaching(o =>
{
    o.DefaultEntryOptions = new() { Expiration = TimeSpan.FromMinutes(10) };
});

// With distributed L2 cache (e.g. Redis)
services.AddFlickrCaching();
services.AddStackExchangeRedisCache(o => o.Configuration = "localhost:6379");

Without AddFlickrCaching(), every API call goes directly to Flickr — no caching overhead.

🔧 Configuration

Default Search Extras

Configure extras that are automatically included in every search:

services.AddFlickr(o =>
{
    o.ApiKey = "...";
    o.SharedSecret = "...";
    o.DefaultSearchExtras = PhotoSearchExtras.Description | PhotoSearchExtras.DateTaken;
});

📖 Migration

Upgrading from an earlier version? See the Migration Guide for breaking changes and upgrade steps.

🤝 Contributing

Contributions are welcome! Please feel free to submit a Pull Request. For major changes, please open an issue first to discuss what you would like to change.

1. Fork the repository
2. Create your feature branch (git checkout -b feature/AmazingFeature)
3. Commit your changes (git commit -m 'Add some AmazingFeature')
4. Push to the branch (git push origin feature/AmazingFeature)
5. Open a Pull Request

📋 Requirements

• .NET 10.0 or higher
• Flickr API key and secret (Get yours here)

📝 License

This project is licensed under the Apache License 2.0 - see the LICENSE file for details.

🙏 Acknowledgments

• Original FlickrNet library by Sam Judson