在本文中，我們將比較 Documenso 和 AWS S3 映像上傳範(fàn)例之間將檔案上傳到 AWS S3 所涉及的步驟。

我們從 Vercel 提供的簡單範(fàn)例開始。

範(fàn)例/aws-s3-image-upload

Vercel 提供了一個(gè)將檔案上傳到 AWS S3 的良好範(fàn)例。

此範(fàn)例的自述文件提供了兩個(gè)選項(xiàng)，您可以使用現(xiàn)有的 S3 儲(chǔ)存桶或建立新儲(chǔ)存桶。了解這一點(diǎn)有幫助

您正確配置了上傳功能。

又到了我們看源碼的時(shí)間了。我們正在尋找 type=file 的輸入元素。在 app/page.tsx 中，您將找到以下程式碼：

return (
    <main>
      <h1>Upload a File to S3</h1>
      <form onSubmit={handleSubmit}>
        <input
         >



<h2>
  
  
  <strong>onChange</strong>
</h2>

<p>onChange updates state using setFile, but it does not do the uploading. upload happens when you submit this form.<br>
</p>

<pre class="brush:php;toolbar:false">onChange={(e) => {
  const files = e.target.files
  if (files) {
    setFile(files[0])
  }
}}

處理提交

handleSubmit 函數(shù)中發(fā)生了很多事情。我們需要分析這個(gè)handleSubmit函數(shù)中的操作列表。我已在此程式碼片段中編寫了註釋來解釋這些步驟。

const handleSubmit = async (e: React.FormEvent<HTMLFormElement>) => {
    e.preventDefault()

    if (!file) {
      alert('Please select a file to upload.')
      return
    }

    setUploading(true)

    const response = await fetch(
      process.env.NEXT_PUBLIC_BASE_URL + '/api/upload',
      {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
        },
        body: JSON.stringify({ filename: file.name, contentType: file.type }),
      }
    )

    if (response.ok) {
      const { url, fields } = await response.json()

      const formData = new FormData()
      Object.entries(fields).forEach(([key, value]) => {
        formData.append(key, value as string)
      })
      formData.append('file', file)

      const uploadResponse = await fetch(url, {
        method: 'POST',
        body: formData,
      })

      if (uploadResponse.ok) {
        alert('Upload successful!')
      } else {
        console.error('S3 Upload Error:', uploadResponse)
        alert('Upload failed.')
      }
    } else {
      alert('Failed to get pre-signed URL.')
    }

    setUploading(false)
  }

api/上傳

api/upload/route.ts 有以下程式碼：

import { createPresignedPost } from '@aws-sdk/s3-presigned-post'
import { S3Client } from '@aws-sdk/client-s3'
import { v4 as uuidv4 } from 'uuid'

export async function POST(request: Request) {
  const { filename, contentType } = await request.json()

  try {
    const client = new S3Client({ region: process.env.AWS_REGION })
    const { url, fields } = await createPresignedPost(client, {
      Bucket: process.env.AWS_BUCKET_NAME,
      Key: uuidv4(),
      Conditions: [
        ['content-length-range', 0, 10485760], // up to 10 MB
        ['starts-with', '$Content-Type', contentType],
      ],
      Fields: {
        acl: 'public-read',
        'Content-Type': contentType,
      },
      Expires: 600, // Seconds before the presigned post expires. 3600 by default.
    })

    return Response.json({ url, fields })
  } catch (error) {
    return Response.json({ error: error.message })
  }
}

handleSubmit 中的第一個(gè)請求是 /api/upload 並發(fā)送內(nèi)容類型和檔案名稱作為負(fù)載。解析如下：

const { filename, contentType } = await request.json()

下一步是建立一個(gè) S3 用戶端，然後建立一個(gè)傳回 url 和欄位的預(yù)簽名貼文。您將使用此網(wǎng)址上傳您的檔案。

有了這些知識，我們來分析一下Documenso中的上傳工作原理並進(jìn)行一些比較。

在 Documenso 上傳 PDF 檔案

讓我們從 type=file 的輸入元素開始。 Documenso 中的程式碼組織方式不同。您會(huì)在名為 document-dropzone.tsx.
的檔案中找到輸入元素

<input {...getInputProps()} />

<p className="text-foreground mt-8 font-medium">{_(heading[type])}</p>

這裡getInputProps回傳的是useDropzone。 Documenso 使用react-dropzone。

import { useDropzone } from 'react-dropzone';

onDrop 呼叫 props.onDrop，你會(huì)在 upload-document.tsx 中找到一個(gè)名為 onFileDrop 的屬性值。

<DocumentDropzone
  className="h-[min(400px,50vh)]"
  disabled={remaining.documents === 0 || !session?.user.emailVerified}
  disabledMessage={disabledMessage}
  onDrop={onFileDrop}
  onDropRejected={onFileDropRejected}
/>

讓我們看看 onFileDrop 函數(shù)會(huì)發(fā)生什麼事。

const onFileDrop = async (file: File) => {
    try {
      setIsLoading(true);

      const { type, data } = await putPdfFile(file);

      const { id: documentDataId } = await createDocumentData({
        type,
        data,
      });

      const { id } = await createDocument({
        title: file.name,
        documentDataId,
        teamId: team?.id,
      });

      void refreshLimits();

      toast({
        title: _(msg`Document uploaded`),
        description: _(msg`Your document has been uploaded successfully.`),
        duration: 5000,
      });

      analytics.capture('App: Document Uploaded', {
        userId: session?.user.id,
        documentId: id,
        timestamp: new Date().toISOString(),
      });

      router.push(`${formatDocumentsPath(team?.url)}/${id}/edit`);
    } catch (err) {
      const error = AppError.parseError(err);

      console.error(err);

      if (error.code === 'INVALID_DOCUMENT_FILE') {
        toast({
          title: _(msg`Invalid file`),
          description: _(msg`You cannot upload encrypted PDFs`),
          variant: 'destructive',
        });
      } else if (err instanceof TRPCClientError) {
        toast({
          title: _(msg`Error`),
          description: err.message,
          variant: 'destructive',
        });
      } else {
        toast({
          title: _(msg`Error`),
          description: _(msg`An error occurred while uploading your document.`),
          variant: 'destructive',
        });
      }
    } finally {
      setIsLoading(false);
    }
  };

發(fā)生了很多事情，但為了我們的分析，我們只考慮名為 putFile 的函數(shù)。

putPdf檔案

putPdfFile 定義在 upload/put-file.ts

/**
 * Uploads a document file to the appropriate storage location and creates
 * a document data record.
 */
export const putPdfFile = async (file: File) => {
  const isEncryptedDocumentsAllowed = await getFlag('app_allow_encrypted_documents').catch(
    () => false,
  );

  const pdf = await PDFDocument.load(await file.arrayBuffer()).catch((e) => {
    console.error(`PDF upload parse error: ${e.message}`);

    throw new AppError('INVALID_DOCUMENT_FILE');
  });

  if (!isEncryptedDocumentsAllowed && pdf.isEncrypted) {
    throw new AppError('INVALID_DOCUMENT_FILE');
  }

  if (!file.name.endsWith('.pdf')) {
    file.name = `${file.name}.pdf`;
  }

  removeOptionalContentGroups(pdf);

  const bytes = await pdf.save();

  const { type, data } = await putFile(new File([bytes], file.name, { type: 'application/pdf' }));

  return await createDocumentData({ type, data });
};

放置檔案

這會(huì)呼叫 putFile 函數(shù)。

/**
 * Uploads a file to the appropriate storage location.
 */
export const putFile = async (file: File) => {
  const NEXT_PUBLIC_UPLOAD_TRANSPORT = env('NEXT_PUBLIC_UPLOAD_TRANSPORT');

  return await match(NEXT_PUBLIC_UPLOAD_TRANSPORT)
    .with('s3', async () => putFileInS3(file))
    .otherwise(async () => putFileInDatabase(file));
};

putFileInS3

const putFileInS3 = async (file: File) => {
  const { getPresignPostUrl } = await import('./server-actions');

  const { url, key } = await getPresignPostUrl(file.name, file.type);

  const body = await file.arrayBuffer();

  const reponse = await fetch(url, {
    method: 'PUT',
    headers: {
      'Content-Type': 'application/octet-stream',
    },
    body,
  });

  if (!reponse.ok) {
    throw new Error(
      `Failed to upload file "${file.name}", failed with status code ${reponse.status}`,
    );
  }

  return {
    type: DocumentDataType.S3_PATH,
    data: key,
  };
};

getPresignPostUrl

export const getPresignPostUrl = async (fileName: string, contentType: string) => {
  const client = getS3Client();

  const { getSignedUrl } = await import('@aws-sdk/s3-request-presigner');

  let token: JWT | null = null;

  try {
    const baseUrl = APP_BASE_URL() ?? 'http://localhost:3000';

    token = await getToken({
      req: new NextRequest(baseUrl, {
        headers: headers(),
      }),
    });
  } catch (err) {
    // Non server-component environment
  }

  // Get the basename and extension for the file
  const { name, ext } = path.parse(fileName);

  let key = `${alphaid(12)}/${slugify(name)}${ext}`;

  if (token) {
    key = `${token.id}/${key}`;
  }

  const putObjectCommand = new PutObjectCommand({
    Bucket: process.env.NEXT_PRIVATE_UPLOAD_BUCKET,
    Key: key,
    ContentType: contentType,
  });

  const url = await getSignedUrl(client, putObjectCommand, {
    expiresIn: ONE_HOUR / ONE_SECOND,
  });

  return { key, url };
};

比較

• 您在 Documenso 中看不到任何 POST 要求。它使用名為 getSignedUrl 的函數(shù)來取得 url，而
  
  vercel 範(fàn)例向 api/upload 路由發(fā)出 POST 請求。

• 在 Vercel 範(fàn)例中可以輕鬆找到輸入元素，因?yàn)檫@只是一個(gè)範(fàn)例，但找到了 Documenso
  
  使用react-dropzone並且輸入元素根據(jù)業(yè)務(wù)上下文定位。

關(guān)於我們：

在 Thinkthroo，我們研究大型開源專案並提供架構(gòu)指南。我們開發(fā)了使用 Tailwind 建構(gòu)的可重複使用元件，您可以在您的專案中使用它們。

我們提供 Next.js、React 和 Node 開發(fā)服務(wù)。

與我們預(yù)約會(huì)面討論您的專案。

參考資料：

1. https://github.com/documenso/documenso/blob/main/packages/lib/universal/upload/put-file.ts#L69

2. https://github.com/vercel/examples/blob/main/solutions/aws-s3-image-upload/README.md

3. https://github.com/vercel/examples/tree/main/solutions/aws-s3-image-upload

4. https://github.com/vercel/examples/blob/main/solutions/aws-s3-image-upload/app/page.tsx#L58C5-L76C12

5. https://github.com/vercel/examples/blob/main/solutions/aws-s3-image-upload/app/api/upload/route.ts

6. https://github.com/documenso/documenso/blob/main/packages/ui/primitives/document-dropzone.tsx#L157

7. https://react-dropzone.js.org/

8. https://github.com/documenso/documenso/blob/main/apps/web/src/app/(dashboard)/documents/upload-document.tsx#L61

9. https://github.com/documenso/documenso/blob/main/packages/lib/universal/upload/put-file.ts#L22

以上是Documenso 和 aws-smage-upload 範(fàn)例之間的 Spload 功能比較的詳細(xì)內(nèi)容。更多資訊請關(guān)注PHP中文網(wǎng)其他相關(guān)文章！