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从 golang 代码将文件发送到 Google Drive API 会产生错误:类型不支持的内容:image/jpeg

来源:stackoverflow

时间:2024-04-20 11:06:35 319浏览 收藏

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问题内容

根据 google drive api 文档,上传文件的正确方法是:

curl -v -h '授权:不记名 mytoken' -f 'metadata={"name": "test3.jpeg"};type=application/json' -f file=@jpeg_image.jpeg 'https:// www.googleapis.com/upload/drive/v3/files?uploadtype=multipart'

现在,我需要从 golang 代码执行相同的请求,但我很难将其转换为 golang,这是我经过多次尝试后使用的代码:

// filebytes are of type []byte
buffer := &bytes.buffer{}
    multipartwriter := multipart.newwriter(buffer)
    multipartwriter.writefield("metadata", "{\"name\": \"test3.jpef\"};type=application/json")
    partheader := textproto.mimeheader{}
    partheader.add("content-type", "image/jpeg")
    filepartwriter, _ := multipartwriter.createpart(partheader)
    io.copy(filepartwriter, bytes.newreader(filebytes))
    multipartwriter.close()

    googledriverequest, _ := http.newrequest(http.methodpost, "https://www.googleapis.com/upload/drive/v3/files?uploadtype=multipart", buffer)
    googledriverequest.header.add("authorization", "bearer "+accesstoken)
    googledriverequest.header.add("content-type", multipartwriter.formdatacontenttype())

    googledriveapiresponse, googledriveapierror := lib.httpclient.do(googledriverequest)

使用curl请求成功:

{
 "kind": "drive#file",
 "id": "1dwsbqgp3-qts5p0iqqrtajcccsafxzgd",
 "name": "test3.jpeg",
 "mimetype": "image/jpeg"
}

使用 golang,我得到 400:

{\n \"error\": {\n  \"errors\": [\n   {\n    \"domain\": \"global\",\n    \"reason\": \"badContent\",\n    \"message\": \"Unsupported content with type: image/jpeg \"\n   }\n  ],\n  \"code\": 400,\n  \"message\": \"Unsupported content with type: image/jpeg\"\n }\n}\n

我还尝试了 partheader.add("content-type", "image/jpeg") 的不同值,我也尝试了 application/x-www-form-urlencoded ,我还注释掉了这一行,并让 golang 进行检测,但仍然出现相同的错误。

有什么建议或想法吗?

问候,


解决方案


问题出在您发送的 json 元数据中。这是一个可以工作的示例代码(使用适当的错误检查),

import (
    "bytes"
    "fmt"
    "io"
    "io/ioutil"
    "log"
    "mime/multipart"
    "net/http"
    "net/textproto"
)

func main() {
    accessToken := "YOUR-TOKEN"

    client := http.Client{}
    mediaData, _ := ioutil.ReadFile("test.png")

    body := &bytes.Buffer{}
    writer := multipart.NewWriter(body)

    // JSON Metadata (part-1)
    jsonMetadata := textproto.MIMEHeader{}
    metadata := `{"name": "test.png"}`
    jsonMetadata.Set("Content-Type", "application/json")
    part, _ := writer.CreatePart(jsonMetadata)
    part.Write([]byte(metadata))

    // Image bytes (part-2)
    imageData := textproto.MIMEHeader{}
    partAttach, _ := writer.CreatePart(imageData)
    io.Copy(partAttach, bytes.NewReader(mediaData))
    writer.Close()

    // Request Content Type with boundary
    contentType := fmt.Sprintf("multipart/related; boundary=%s", writer.Boundary())

    // HTTP Request with auth and content type headers
    req, _ := http.NewRequest(http.MethodPost, "https://www.googleapis.com/upload/drive/v3/files?uploadType=multipart", bytes.NewReader(body.Bytes()))
    req.Header.Add("Authorization", "Bearer "+accessToken)
    req.Header.Add("Content-Type", contentType)

    // Send request
    resp, err := client.Do(req)
    if err != nil {
        log.Fatalf("failed to send request: %v", err)
    }
    defer resp.Body.Close()
    content, _ := ioutil.ReadAll(resp.Body)

    log.Printf("http status: %d", resp.StatusCode)
    log.Printf("response: %s", string(content))
}

参考号:https://developers.google.com/drive/api/v3/manage-uploads?authuser=1#send_a_multipart_upload_request

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