51 lines
1.8 KiB
Swift
51 lines
1.8 KiB
Swift
//
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// CatFacts.swift
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// CatFactsKit
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//
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import Foundation
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public struct CatFacts {
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let baseURL: URL
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let urlSession: URLSession
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public init(baseURL: URL, urlSession: URLSession = .shared) {
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self.baseURL = baseURL
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self.urlSession = urlSession
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}
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public func getFacts(count: Int? = nil) async throws -> [String] {
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let params = count.map { ["count": $0] } ?? [:]
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let request = try generateRequest(path: "/", params: params)
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let response: FactsResponse = try await decodeRequest(request: request)
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return response.data
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}
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// MARK: - Private functionality
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private func generateRequest(path: String, params: [String: CustomStringConvertible] = [:]) throws -> URLRequest {
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guard let url = URL(string: path, relativeTo: baseURL) else {
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throw CatFactsError.requestError("Couldn't generate URL from path: \(path), baseURL: \(baseURL)")
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}
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let queryItems = params
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.compactMap { URLQueryItem(name: $0, value: $1.description) }
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.sorted { a, b in a.name < b.name }
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return queryItems.count > 0
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? URLRequest(url: url.appending(queryItems: queryItems))
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: URLRequest(url: url)
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}
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private func decodeRequest<T: Decodable>(request: URLRequest) async throws -> T {
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let (data, response) = try await urlSession.data(for: request)
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guard let response = response as? HTTPURLResponse else {
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throw CatFactsError.connectionError("Couldn't get HTTP response from request \(request)")
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}
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guard response.statusCode < 300 else {
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let body = String(data: data, encoding: .utf8)
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throw CatFactsError.responseError(response.statusCode, body ?? "unknown error")
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}
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return try JSONDecoder().decode(T.self, from: data)
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}
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}
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