使用 multipart-form 将文件上传到 Salesforce

Question

我正在尝试将文本文件（也尝试过 PDF 等）上传到 Salesforce。文本文件包含 'hello world'.

这是我使用的代码

def putFile(sf, libname, filen):
    file_name=os.path.basename(filen)
    libId=libraryExists(sf, libname)
    contentDocumentId = getContentDocumentId(sf, libname, file_name)
    if not libId:
        print(f"Provided library '{libname}' does not exists")
        return

    with open(filen, "rb") as f:
        bodyEncoded = base64.b64encode(f.read())

    boundary = '----------------------------741e90d31eff'
    headers = {
        'Content-Type' : 'multipart/form-data; boundary=' + boundary
    }

    nonBinaryPart = '--'+boundary+'\nContent-Disposition: form-data; name="entity_content";\n'
    nonBinaryPart += 'Content-Type: application/json;\r\n\r\n'
    nonBinaryPart += json.dumps({
        "ContentDocumentId" : contentDocumentId,
        "ReasonForChange" : "Large file upload", 
        "PathOnClient" : file_name
    })
    nonBinaryPart += '\r\n\r\n'

    header = '--'+boundary+'\nContent-Disposition: form-data; name="VersionData"; filename="'+file_name+'";\nContent-Type: application/octet-stream\r\n\r\n'
    footer = '--'+boundary+'--'
    headerEncoded = header
    last4Bytes = bodyEncoded[len(bodyEncoded)-4:len(bodyEncoded)]
    print(type(last4Bytes))
    print(last4Bytes)
    if last4Bytes.endswith(b'=='):
        last4Bytes = last4Bytes[0:2] + b'0K'
        bodyEncoded = bodyEncoded[0:len(bodyEncoded)-4] + last4Bytes
        footerEncoded = footer
        reqBody = headerEncoded+str(bodyEncoded)+footerEncoded
    elif last4Bytes.endswith(b'='):
        print('Ends with =')
        last4Bytes = last4Bytes[0:3] + b'N'
        bodyEncoded = bodyEncoded[0:len(bodyEncoded)-4] + last4Bytes
        footer = '\n' + footer;
        footerEncoded = footer
        reqBody = headerEncoded+str(bodyEncoded)+footerEncoded
    else:
        footer = '\r\n' + footer
        footerEncoded = footer
        reqBody = headerEncoded+str(bodyEncoded)+footerEncoded

    reqBody = nonBinaryPart + reqBody

    print('==================================================')
    print(reqBody)
    print('==================================================')

    res = sf.contentVersion.create(reqBody, headers)

    print(res)

    print('Now downloading it...')
    os.system('rm -f ' + filen + '_downloaded')
    getFile(sf, contentDocumentId, filen + '_downloaded', './' )
    print('Downloaded.')


    os.system('md5sum ' + filen)
    os.system('md5sum ' + filen + '_downloaded')

这会导致以下请求 body，这似乎符合 Salesforce 指南： https://developer.salesforce.com/docs/atlas.en-us.api_rest.meta/api_rest/dome_sobject_insert_update_blob.htm

Headers:

Content-Type: multipart/form-data; boundary="----------------------------741e90d31eff" 接受：application/json

请求body：

--------------------------------741e90d31eff Content-Disposition: form-data;名字="entity_content"; Content-Type: application/json;

{"ContentDocumentId": "0699E000000lKbLQAU", "ReasonForChange": "Large file upload", "PathOnClient": "hello_world.txt"}

--------------------------------741e90d31eff Content-Disposition: form-data;名字="VersionData";文件名="hello_world.txt"； Content-Type: application/octet-stream

b'aGVsbG8gd29ybGQK' ------------------------------741e90d31eff--

Answer 1

如您的代码所示 bodyEncoded = base64.b64encode(f.read())，文件以 base64 编码发送。下载文件后需要对其进行解码以恢复其原始 "readable" 值。

注意：正如你的评论所说，你的文件内容是b'aGVsbG8gd29ybGQK'，其中b表示一个base64编码的字符串，另一个部分是编码值，您也可以使用 base64decode 等在线工具对其进行编码，这将显示该字符串正好是 hello world

Answer 2

我终于明白了。因此，要将多部分表单数据上传到 Salesforce： 1.没有base64编码！！！！它需要保持二进制 2. 我的错误是我试图将字符串连接到字节。因此，构建多部分消息的非二进制部分并将其编码为二进制：

nonbinaryPart.encode()

比将字节附加到字节，文件的二进制内容。
调用api时，post数据为字节。请注意 API 的用法，例如 simple-salsforce 默认情况下可能希望将其编码为 json。不需要后续编码。 Post 作为二进制。

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