110 lines
4.5 KiB
C#
110 lines
4.5 KiB
C#
using System;
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using System.Net.Http;
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using System.Net.Http.Headers;
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using System.Threading.Tasks;
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using PcgsInvUi.Models;
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using System.Text.Json;
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using ReactiveUI;
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namespace PcgsInvUi.Services;
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public class PcgsClient : ReactiveObject {
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public enum ErrorType {
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None,
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NoCoinFound,
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InvalidRequestFormat,
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ApiKeyInvalid
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}
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public int NumApiRequests {
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get => _numApiRequests;
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set => this.RaiseAndSetIfChanged(ref _numApiRequests, value);
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}
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private string _apiUri = "https://api.pcgs.com/publicapi";
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private readonly string _apiKey;
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private int _numApiRequests;
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/// <summary>
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/// Creates a new instance of the PcgsClient class.
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/// Although this is a constructor, it's meant to be called only from the CreateClient method.
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/// </summary>
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private PcgsClient(string apiKey) {
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_apiKey = apiKey;
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// "E8xivTVN_k4Q8ubk8Xv_uU11U91WX0wDht4S4m4BAf2HPmKnGrZ0J2f9nccM7Ns1VkGoT1SXYR74I7aNaMKqXlJGEy3oobseKV0nGiqu1IKvFkOTVjhV37SWUVExSDFMC6FLzs7xJQIHwkcxr5JFOQNmc4ZytEh_-hmCN3NL-z0fEk98tzBmPJ_F7bq_xNru86QMD2A9yalu_dWe-lCysfyE2bCA2EDqwvWenRYf-0XnNtp6qlxxCMlCd-TDqqRKLC3qefCwpXSemwBiNSP5gbC9pwcKrZugkruuJ0nyxxThZymm";
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}
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/// <summary>
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/// Creates a new instance of the PcgsClient class.
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/// </summary>
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/// <param name="apiKey">The api key to use for requests.</param>
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/// <returns>A new instance of the PcgsClient class, or null if the key is invalid.</returns>
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public static PcgsClient? CreateClient(string apiKey) {
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// Check if the api key is valid.
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var testClient = new PcgsClient(apiKey);
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if (!testClient.VerifyCredentials()) return null;
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return testClient;
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}
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public bool VerifyCredentials() {
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// Create a way to check if the api key given is valid
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// I think the best way to do this is to make a request to the api and see if it returns the expected response.
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var result = this.GetCoinFactsByGrade(1, "1"); // This is a known invalid coin id - this is because the api is very fast with invalid requests.
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if (result.Result.Item1 == ErrorType.ApiKeyInvalid) return false;
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return true;
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}
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public async Task<(ErrorType, Coin?)> GetCoinFactsByGrade(int pcgsNumber, string grade, bool plusGrade = false) {
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using (HttpClient client = new HttpClient()) {
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var gradeParam = GetGradeFromString(grade);
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string requestUri =
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$"{_apiUri}/coindetail/GetCoinFactsByGrade/?PCGSNo={pcgsNumber}&GradeNo={gradeParam}&PlusGrade={plusGrade}";
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client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("bearer", _apiKey);
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Console.WriteLine($"Sending request to {requestUri}");
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HttpResponseMessage response = await client.GetAsync(requestUri);
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Console.WriteLine("Got response.");
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if (response.IsSuccessStatusCode) {
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string jsonResponse = await response.Content.ReadAsStringAsync();
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var parsedResponse = ParseJsonResponse(jsonResponse);
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return parsedResponse;
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}
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}
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return (ErrorType.ApiKeyInvalid, null);
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}
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private int GetGradeFromString(string grade) {
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var actualGrade = int.Parse(grade.Substring(grade.Length - 2));
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Console.WriteLine($"Grade is {actualGrade}");
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return actualGrade;
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}
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// TODO Will eventually create the other methods that are included in the Public API.
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private (ErrorType, Coin?) ParseJsonResponse(string json) {
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Console.WriteLine(json);
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// TODO Check for errors in the response
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if (json.Contains("\"ServerMessage\":\"No data found\"")) return (ErrorType.NoCoinFound, null);
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if (json.Contains("\"IsValidRequest\":false")) return (ErrorType.InvalidRequestFormat, null);
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var newCoin = JsonSerializer.Deserialize<Coin>(json);
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return (ErrorType.None, newCoin);
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}
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}
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// Exception for invalid request format
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class InvalidRequestFormatException : Exception {
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public InvalidRequestFormatException() { }
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public InvalidRequestFormatException(string message) : base(message) { }
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public InvalidRequestFormatException(string message, Exception inner) : base(message, inner) { }
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}
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// Exception for no coin found
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class CoinNotFoundException : Exception {
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public CoinNotFoundException() { }
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public CoinNotFoundException(string message) : base(message) { }
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public CoinNotFoundException(string message, Exception inner) : base(message, inner) { }
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}
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