104 lines
4.7 KiB
Swift
104 lines
4.7 KiB
Swift
import Foundation
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import os
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class OpenAICompatibleTranscriptionService {
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private let logger = Logger(subsystem: "com.voiceink.transcription", category: "OpenAICompatibleService")
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func transcribe(audioURL: URL, model: CustomCloudModel) async throws -> String {
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let config = APIConfig(
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url: URL(string: model.apiEndpoint)!,
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apiKey: model.apiKey,
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modelName: model.modelName
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)
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let boundary = "Boundary-\(UUID().uuidString)"
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var request = URLRequest(url: config.url)
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request.httpMethod = "POST"
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request.setValue("multipart/form-data; boundary=\(boundary)", forHTTPHeaderField: "Content-Type")
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request.setValue("Bearer \(config.apiKey)", forHTTPHeaderField: "Authorization")
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let body = try createOpenAICompatibleRequestBody(audioURL: audioURL, modelName: config.modelName, boundary: boundary)
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let (data, response) = try await URLSession.shared.upload(for: request, from: body)
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guard let httpResponse = response as? HTTPURLResponse else {
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throw CloudTranscriptionError.networkError(URLError(.badServerResponse))
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}
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if !(200...299).contains(httpResponse.statusCode) {
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let errorMessage = String(data: data, encoding: .utf8) ?? "No error message"
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logger.error("OpenAI-compatible API request failed with status \(httpResponse.statusCode): \(errorMessage, privacy: .public)")
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throw CloudTranscriptionError.apiRequestFailed(statusCode: httpResponse.statusCode, message: errorMessage)
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}
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do {
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let transcriptionResponse = try JSONDecoder().decode(TranscriptionResponse.self, from: data)
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return transcriptionResponse.text
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} catch {
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logger.error("Failed to decode OpenAI-compatible API response: \(error.localizedDescription)")
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throw CloudTranscriptionError.noTranscriptionReturned
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}
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}
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private func createOpenAICompatibleRequestBody(audioURL: URL, modelName: String, boundary: String) throws -> Data {
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var body = Data()
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let crlf = "\r\n"
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guard let audioData = try? Data(contentsOf: audioURL) else {
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throw CloudTranscriptionError.audioFileNotFound
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}
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let selectedLanguage = UserDefaults.standard.string(forKey: "SelectedLanguage") ?? "auto"
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let prompt = UserDefaults.standard.string(forKey: "TranscriptionPrompt") ?? ""
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body.append("--\(boundary)\(crlf)".data(using: .utf8)!)
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body.append("Content-Disposition: form-data; name=\"file\"; filename=\"\(audioURL.lastPathComponent)\"\(crlf)".data(using: .utf8)!)
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body.append("Content-Type: audio/wav\(crlf)\(crlf)".data(using: .utf8)!)
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body.append(audioData)
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body.append(crlf.data(using: .utf8)!)
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body.append("--\(boundary)\(crlf)".data(using: .utf8)!)
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body.append("Content-Disposition: form-data; name=\"model\"\(crlf)\(crlf)".data(using: .utf8)!)
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body.append(modelName.data(using: .utf8)!)
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body.append(crlf.data(using: .utf8)!)
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if selectedLanguage != "auto", !selectedLanguage.isEmpty {
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body.append("--\(boundary)\(crlf)".data(using: .utf8)!)
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body.append("Content-Disposition: form-data; name=\"language\"\(crlf)\(crlf)".data(using: .utf8)!)
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body.append(selectedLanguage.data(using: .utf8)!)
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body.append(crlf.data(using: .utf8)!)
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}
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// Include prompt for OpenAI-compatible APIs
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if !prompt.isEmpty {
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body.append("--\(boundary)\(crlf)".data(using: .utf8)!)
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body.append("Content-Disposition: form-data; name=\"prompt\"\(crlf)\(crlf)".data(using: .utf8)!)
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body.append(prompt.data(using: .utf8)!)
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body.append(crlf.data(using: .utf8)!)
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}
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body.append("--\(boundary)\(crlf)".data(using: .utf8)!)
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body.append("Content-Disposition: form-data; name=\"response_format\"\(crlf)\(crlf)".data(using: .utf8)!)
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body.append("json".data(using: .utf8)!)
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body.append(crlf.data(using: .utf8)!)
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body.append("--\(boundary)\(crlf)".data(using: .utf8)!)
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body.append("Content-Disposition: form-data; name=\"temperature\"\(crlf)\(crlf)".data(using: .utf8)!)
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body.append("0".data(using: .utf8)!)
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body.append(crlf.data(using: .utf8)!)
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body.append("--\(boundary)--\(crlf)".data(using: .utf8)!)
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return body
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}
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private struct APIConfig {
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let url: URL
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let apiKey: String
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let modelName: String
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}
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private struct TranscriptionResponse: Decodable {
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let text: String
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let language: String?
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let duration: Double?
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}
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} |