C# 範例程式碼

以下程式碼使用 curl 轉換器撰寫，請斟酌參考

https://curlconverter.com/

1. 取得 Presigned URL

using System.Net.Http;
using System.Net.Http.Headers;

HttpClient client = new HttpClient();

HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Post, "https://api.maiagent.ai/api/v1/upload-presigned-url/");

request.Headers.Add("Authorization", "Api-Key ");

request.Content = new StringContent("{\n    \"filename\": \"Products_example.xlsx\",\n    \"modelName\": \"chatbot-file\",\n    \"fieldName\": \"file\",\n    \"fileSize\": 5881\n}");
request.Content.Headers.ContentType = new MediaTypeHeaderValue("application/json");

HttpResponseMessage response = await client.SendAsync(request);
response.EnsureSuccessStatusCode();
string responseBody = await response.Content.ReadAsStringAsync();

1. 上傳檔案至雲端儲存

using System.Net.Http;

HttpClient client = new HttpClient();

HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Post, "https://s3.ap-northeast-1.amazonaws.com/whizchat-media-prod-django.playma.app");

MultipartFormDataContent content = new MultipartFormDataContent();
content.Add(new StringContent("media/chatbots/chatbot-file/d83c88aa-3874-49a6-b01e-1948ae48b747.xlsx"), "key");
content.Add(new StringContent("AWS4-HMAC-SHA256"), "x-amz-algorithm");
content.Add(new StringContent("AKIATIVCN4X5JXWAP43M/20241129/ap-northeast-1/s3/aws4_request"), "x-amz-credential");
content.Add(new StringContent("20241129T012318Z"), "x-amz-date");
content.Add(new StringContent("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"), "policy");
content.Add(new StringContent("0254b3baa65c3a69eaeeccd0a3d027bc7952c1587cc96437c096eb1b76e1d692"), "x-amz-signature");
content.Add(new ByteArrayContent(File.ReadAllBytes("/Users/maiagent/Downloads/Products_example.png")), "file", Path.GetFileName("/Users/maiagent/Downloads/Products_example.png"));
request.Content = content;

HttpResponseMessage response = await client.SendAsync(request);
response.EnsureSuccessStatusCode();
string responseBody = await response.Content.ReadAsStringAsync();

1. 確認檔案上傳與提交檔案資訊

using System.Net.Http;
using System.Net.Http.Headers;

HttpClient client = new HttpClient();

HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Post, "https://api.maiagent.ai/api/chatbots/484a07fe-b401-4a32-9077-ddaae0c5e862/files/");

request.Headers.Add("Authorization", "Api-Key <api-key>");

request.Content = new StringContent("{\n    \"files\": [\n        {\n            \"file\": \"media/chatbots/chatbot-file/d83c88aa-3874-49a6-b01e-1948ae48b747.xlsx\",\n            \"filename\": \"Products_example.xlsx\"\n        }\n    ]\n}");
request.Content.Headers.ContentType = new MediaTypeHeaderValue("application/json");

HttpResponseMessage response = await client.SendAsync(request);
response.EnsureSuccessStatusCode();
string responseBody = await response.Content.ReadAsStringAsync();

以上三個請求請 AI 整合後為以下 Service

using System;
using System.IO;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Threading.Tasks;

public class FileUploadService
{
    private readonly HttpClient _client;
    private readonly string _apiKey;
    
    public FileUploadService(string apiKey)
    {
        _client = new HttpClient();
        _apiKey = apiKey;
    }
    
    public async Task UploadFileAsync(string filePath, string chatbotId)
    {
        try
        {
            // 1. 取得 Presigned URL
            var presignedUrlInfo = await GetPresignedUrlAsync(filePath);
            
            // 2. 上傳檔案至雲端儲存
            await UploadToCloudStorageAsync(filePath, presignedUrlInfo);
            
            // 3. 確認檔案上傳與提交檔案資訊
            await ConfirmFileUploadAsync(presignedUrlInfo, chatbotId);
        }
        catch (Exception ex)
        {
            throw new Exception($"檔案上傳過程發生錯誤: {ex.Message}");
        }
    }
    
    private async Task<PresignedUrlInfo> GetPresignedUrlAsync(string filePath)
    {
        var request = new HttpRequestMessage(HttpMethod.Post, "https://api.maiagent.ai/api/v1/upload-presigned-url/");
        request.Headers.Add("Authorization", $"Api-Key {_apiKey}");
        
        var fileInfo = new FileInfo(filePath);
        var content = new
        {
            filename = fileInfo.Name,
            modelName = "chatbot-file",
            fieldName = "file",
            fileSize = fileInfo.Length
        };
        
        request.Content = new StringContent(System.Text.Json.JsonSerializer.Serialize(content));
        request.Content.Headers.ContentType = new MediaTypeHeaderValue("application/json");
        
        var response = await _client.SendAsync(request);
        response.EnsureSuccessStatusCode();
        return await System.Text.Json.JsonSerializer.DeserializeAsync<PresignedUrlInfo>(
            await response.Content.ReadAsStreamAsync());
    }
    
    private async Task UploadToCloudStorageAsync(string filePath, PresignedUrlInfo presignedInfo)
    {
        var request = new HttpRequestMessage(HttpMethod.Post, presignedInfo.UploadUrl);
        
        var content = new MultipartFormDataContent();
        content.Add(new StringContent(presignedInfo.Key), "key");
        content.Add(new StringContent(presignedInfo.Algorithm), "x-amz-algorithm");
        content.Add(new StringContent(presignedInfo.Credential), "x-amz-credential");
        content.Add(new StringContent(presignedInfo.Date), "x-amz-date");
        content.Add(new StringContent(presignedInfo.Policy), "policy");
        content.Add(new StringContent(presignedInfo.Signature), "x-amz-signature");
        content.Add(new ByteArrayContent(File.ReadAllBytes(filePath)), "file", Path.GetFileName(filePath));
        
        request.Content = content;
        var response = await _client.SendAsync(request);
        response.EnsureSuccessStatusCode();
    }
    
    private async Task ConfirmFileUploadAsync(PresignedUrlInfo presignedInfo, string chatbotId)
    {
        var request = new HttpRequestMessage(HttpMethod.Post, 
            $"https://api.maiagent.ai/api/chatbots/{chatbotId}/files/");
        request.Headers.Add("Authorization", $"Api-Key {_apiKey}");
        
        var content = new
        {
            files = new[]
            {
                new
                {
                    file = presignedInfo.Key,
                    filename = presignedInfo.Filename
                }
            }
        };
        
        request.Content = new StringContent(System.Text.Json.JsonSerializer.Serialize(content));
        request.Content.Headers.ContentType = new MediaTypeHeaderValue("application/json");
        
        var response = await _client.SendAsync(request);
        response.EnsureSuccessStatusCode();
    }
}

// 用於存儲 Presigned URL 相關資訊的類別
public class PresignedUrlInfo
{
    public string UploadUrl { get; set; }
    public string Key { get; set; }
    public string Algorithm { get; set; }
    public string Credential { get; set; }
    public string Date { get; set; }
    public string Policy { get; set; }
    public string Signature { get; set; }
    public string Filename { get; set; }
}

呼叫使用方法

// 初始化服務
var uploadService = new FileUploadService("your-api-key-here");

// 上傳檔案
await uploadService.UploadFileAsync(
    filePath: "/path/to/your/file.xlsx",
    chatbotId: "484a07fe-b401-4a32-9077-ddaae0c5e862"
);