DiscordKit feat: impl getGatewayURL

Sources/DiscordKit/ApiClient.swift

@@ -0,0 +1,36 @@
+import Foundation
+#if canImport(FoundationNetowrking)
+import FoundationNetworking
+#endif
+
+struct ApiClient {
+    static let apiUrl: URL = URL(string: "https://discord.com/api/v10")!
+    let token: String
+
+    private func authReq(_ request: consuming URLRequest) async throws -> (Data, URLResponse) {
+        request.setValue("Bot \(token)", forHTTPHeaderField: "Authorization")
+        request.setValue("DiscordKit (https:\\candy123.moe, v0.0.1)", forHTTPHeaderField: "User-Agent")
+        request.setValue("application/json", forHTTPHeaderField: "Content-Type")
+        let (data, res) = try await URLSession.shared.data(for: request)
+        guard let res = res as? HTTPURLResponse else { throw ApiError.invalidResponse }
+        guard res.statusCode >= 200 && res.statusCode <= 299 else { throw ApiError.badStatus("Status code not 2xx: \(res.statusCode)") }
+
+        return (data, res)
+    }
+
+    func getGatewayURL() async throws -> URL {
+        var req = URLRequest(url: ApiClient.apiUrl.appending(path: "/gateway/bot"))
+        req.httpMethod = "GET"
+        let (data, _) = try await authReq(req)
+
+        let json = JSONDecoder()
+        let decoded = try json.decode(GetGatewayResponse.self, from: data)
+        return decoded.url
+
+    }
+}
+
+enum ApiError: Error {
+    case invalidResponse
+    case badStatus(_ message: String)
+}