feat: add implementation for coop product provider

Author: manuel-rw

GrocyScanner.Core/Extensions/DateTimeExtensions.cs

@@ -0,0 +1,12 @@
+namespace GrocyScanner.Core.Extensions;
+
+public static class DateTimeExtensions
+{
+    public static long GetUnixMilliseconds(this DateTime date)
+    {
+        DateTime zero = new DateTime(1970, 1, 1);
+        TimeSpan span = date.Subtract(zero);
+
+        return (long)span.TotalMilliseconds;
+    }
+}

GrocyScanner.Core/Models/Coop/CoopProduct.cs

@@ -0,0 +1,12 @@
+using System.Text.Json.Serialization;
+
+namespace GrocyScanner.Core.Models.Coop;
+
+public class CoopProduct
+{
+    [JsonPropertyName("success")]
+    public required bool Success { get; set; }
+    
+    [JsonPropertyName("contentJsons")]
+    public required CoopProductContentJson ContentJsons { get; set; }
+}

GrocyScanner.Core/Models/Coop/CoopProductAnhor.cs

@@ -0,0 +1,15 @@
+using System.Text.Json.Serialization;
+
+namespace GrocyScanner.Core.Models.Coop;
+
+public class CoopProductAnhor
+{
+    [JsonPropertyName("anchor")]
+    public required string Anchor { get; set; }
+
+    [JsonPropertyName("name")]
+    public required string Name { get; set; }
+
+    [JsonPropertyName("json")]
+    public required CoopProductTile Json { get; set; }
+}

GrocyScanner.Core/Models/Coop/CoopProductContentJson.cs

@@ -0,0 +1,9 @@
+using System.Text.Json.Serialization;
+
+namespace GrocyScanner.Core.Models.Coop;
+
+public class CoopProductContentJson
+{
+    [JsonPropertyName("anchors")]
+    public required List<CoopProductAnhor> Anchors { get; set; }
+}

GrocyScanner.Core/Models/Coop/CoopProductElement.cs

@@ -0,0 +1,45 @@
+using System.Text.Json.Serialization;
+
+namespace GrocyScanner.Core.Models.Coop;
+
+public class CoopProductElement
+{
+    [JsonPropertyName("elementType")]
+    public required string ElementType { get; set; }
+
+    [JsonPropertyName("id")]
+    public required string Id { get; set; }
+
+    [JsonPropertyName("title")]
+    public required string Title { get; set; }
+
+    [JsonPropertyName("type")]
+    public required string Type { get; set; }
+
+    [JsonPropertyName("href")]
+    public required string Href { get; set; }
+
+    [JsonPropertyName("image")]
+    public required CoopProductImage Image { get; set; }
+
+    [JsonPropertyName("quantity")]
+    public required string Quantity { get; set; }
+
+    [JsonPropertyName("ratingAmount")]
+    public required int RatingAmount { get; set; }
+
+    [JsonPropertyName("ratingValue")]
+    public required double RatingValue { get; set; }
+
+    [JsonPropertyName("ratingLink")]
+    public required string RatingLink { get; set; }
+
+    [JsonPropertyName("brand")]
+    public string? Brand { get; set; }
+
+    [JsonPropertyName("price")]
+    public required string Price { get; set; }
+
+    [JsonPropertyName("udoCat")]
+    public required List<string> UdoCat { get; set; }
+}

GrocyScanner.Core/Models/Coop/CoopProductImage.cs

@@ -0,0 +1,24 @@
+using System.Text.Json.Serialization;
+
+namespace GrocyScanner.Core.Models.Coop;
+
+public class CoopProductImage
+{
+    [JsonPropertyName("lazyload")]
+    public required bool Lazyload { get; set; }
+
+    [JsonPropertyName("lazyloadSrc")]
+    public required string LazyloadSrc { get; set; }
+
+    [JsonPropertyName("loader")]
+    public required string Loader { get; set; }
+
+    [JsonPropertyName("sizes")]
+    public required Dictionary<string, string> Sizes { get; set; }
+
+    [JsonPropertyName("src")]
+    public required string Src { get; set; }
+
+    [JsonPropertyName("srcset")]
+    public required List<List<string>> Srcset { get; set; }
+}

GrocyScanner.Core/Models/Coop/CoopProductTile.cs

@@ -0,0 +1,12 @@
+using System.Text.Json.Serialization;
+
+namespace GrocyScanner.Core.Models.Coop;
+
+public class CoopProductTile
+{
+    [JsonPropertyName("elements")]
+    public required List<CoopProductElement> Elements { get; set; }
+
+    [JsonPropertyName("context")]
+    public required string Context { get; set; }
+}

GrocyScanner.Core/Providers/CoopProductProvider.cs

@@ -1,12 +1,90 @@
+using System.Text.Json;
+using GrocyScanner.Core.Extensions;
 using GrocyScanner.Core.Models;
+using GrocyScanner.Core.Models.Coop;
+using Microsoft.Extensions.Logging;
 
 namespace GrocyScanner.Core.Providers;
 
 public class CoopProductProvider : IProductProvider
 {
-    public Task<Product?> GetProductByGtin(string gtin)
+    private const string DesiredAnchor = "[data-product-container='searchresults']";
+
+    private readonly IHttpClientFactory _httpClientFactory;
+
+    private readonly ILogger<CoopProductProvider> _logger;
+
+    public CoopProductProvider(IHttpClientFactory httpClientFactory, ILogger<CoopProductProvider> logger)
+    {
+        _httpClientFactory = httpClientFactory;
+        _logger = logger;
+    }
+
+    public async Task<Product?> GetProductByGtin(string gtin)
+    {
+        long timeInMilliseconds = DateTime.Now.GetUnixMilliseconds();
+        using HttpClient httpClient = _httpClientFactory.CreateClient();
+
+        // do not pass any headers. Coop's API is really picky
+        HttpRequestMessage request = new(HttpMethod.Get,
+            $"https://www.coop.ch/de/dynamic-pageload/searchresultJson?componentName=searchresultJson&url=%2Fde%2Fsearch%2F%3Ftext%3D{gtin}&displayUrl=%2Fde%2Fsearch%2F%3Ftext%3D{gtin}&compiledTemplates%5B%5D=productTile-new&compiledTemplates%5B%5D=sellingBanner&_={timeInMilliseconds}");
+
+        HttpResponseMessage httpResponseMessage = await httpClient.SendAsync(request);
+        string content = await httpResponseMessage.Content.ReadAsStringAsync();
+
+        try
+        {
+            httpResponseMessage.EnsureSuccessStatusCode();
+            CoopProduct coopProduct = JsonSerializer.Deserialize<CoopProduct>(content)!;
+
+            if (!coopProduct.Success)
+            {
+                _logger.LogError("Coop indicated that result was not successful: {Json}", content);
+                return null;
+            }
+
+            CoopProductAnhor? anchor = coopProduct.ContentJsons.Anchors.SingleOrDefault(anchor =>
+                anchor.Anchor.Equals(DesiredAnchor, StringComparison.Ordinal));
+            if (anchor == null)
+            {
+                _logger.LogError("Did not find the desired anchor for the product {Gtin}. Found {CountAnchor} anchors",
+                    gtin, coopProduct.ContentJsons.Anchors.Count);
+                return null;
+            }
+
+            if (anchor.Json.Elements.Count != 1)
+            {
+                _logger.LogError("Search returned more than one item for the barcode: {CountProducts}",
+                    anchor.Json.Elements.Count);
+                return null;
+            }
+
+            CoopProductElement element = anchor.Json.Elements.First();
+            return new Product
+            {
+                Name = element.Title,
+                Categories = element.UdoCat,
+                Gtin = gtin,
+                ImageUrl = GetBestQualityImage(element.Image)
+            };
+        }
+        catch (HttpRequestException httpRequestException)
+        {
+            _logger.LogError(httpRequestException, "Failed to fetch coop product: {Gtin} - {JsonResponse}", gtin,
+                content);
+            return null;
+        }
+    }
+
+    private static string GetBestQualityImage(CoopProductImage coopProductImage)
     {
-        throw new NotImplementedException();
+        return coopProductImage.Srcset
+            .OrderByDescending(sourceSetPair =>
+                int.Parse(sourceSetPair
+                    .Last()
+                    .Trim('w')))
+            .First()
+            .First();
     }
 
     public string Name => "Coop";