使用multipart-form将文件上载到Salesforce

Question

我正在尝试上传一个文本文件（也尝试了PDF等）到Salesforce。文本文件包含“Hello World”。

这是我正在使用的代码

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')

这将导致以下看起来符合Salesforce指导原则的请求正文:https://developer.Salesforce.com/docs/atlas.en-us.api_rest.meta/api_rest/dome_sobject_insert_update_blob.htm

内容-类型：多部分/表单-数据；boundary=“-----------------------741E90D31EFF”Accept：Application/JSON

请求正文：

------------------------------741E90D31EFF内容-处置：表单-数据；name=“Entity_Content”；内容类型：Application/JSON；

Answer 1

就像您的代码显示bodyencode=base64.b64encode(f.read())，文件是以base64编码的方式发送的。您需要在下载文件后对其进行解码，以恢复其原始的“可读”值。

注意：就像您的评论所说的，您的文件的内容是B'AGVSBG8GD29YBGQK'，其中B表示一个base64编码的字符串，另一部分是编码值，您也可以使用base64decode这样的在线工具对其进行编码，它将显示该字符串正是Hello World