将图像从 Uri 上传到 Retrofit（S3 签名 url）不起作用答案

【问题标题】：Upload image from Uri to Retrofit (S3 Signed url) not working将图像从 Uri 上传到 Retrofit（S3 签名 url）不起作用
【发布时间】：2022-08-13 21:06:13
【问题描述】：

使用文件作为源上传到 S3 签名的 URL 没有问题，但是尝试使用从 ActivityResult 获得的 Uri 对我不起作用。

这是我尝试的：

我正在使用 InputStreamRequestBody 类，如下所述：https://commonsware.com/blog/2020/07/05/multipart-upload-okttp-uri.html

class InputStreamRequestBody(
  private val contentType: MediaType,
  private val contentResolver: ContentResolver,
  private val uri: Uri
) : RequestBody() {
  override fun contentType() = contentType

  override fun contentLength(): Long = -1

  @Throws(IOException::class)
  override fun writeTo(sink: BufferedSink) {
    val input = contentResolver.openInputStream(uri)

    input?.use { sink.writeAll(it.source()) }
      ?: throw IOException(\"Could not open $uri\")
  }
}

我的改造 UploadAPI 接口：

interface UploadAPI {

    @PUT
    suspend fun uploadFile(
        @Header(\"x-amz-acl\") contentType: String,
        @Url uploadUrl: String,
        @Body file: RequestBody
    ): Response<Unit>


    companion object {
        const val BASE_URL = \"https://....com\"
    }
}

这里是我在 AppModule 中的改造单例：

@Provides
@Singleton
fun provideUploadApi(): UploadAPI { 

    return Retrofit.Builder()
        .baseUrl(UploadAPI.BASE_URL) 
        .addConverterFactory(GsonConverterFactory.create())
        .build()
        .create(UploadAPI::class.java)
}

然后使用我的 Uri（在我的存储库中）调用 InputStreamRequestBody 类并调用改造实例和上传函数：

        val resolver = context.contentResolver
        val type = (\"image/jpeg\").toMediaType()
        val contentPart = InputStreamRequestBody(type, resolver, content) 

        uploadAPI.uploadFile(
                \"public-read\",
                mySignedUrl,
                contentPart
            )

这是我的 logginInterceptor 告诉我的：

2022-05-19 22:16:48.844 8469-8703/com.havanasun.loginplayground I/okhttp.OkHttpClient: --> PUT https://app-content.ams3.digitaloceanspaces.com/Files/Test/profilbild.webp?Content-Type=image%2Fwebp&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=CENSORED-Amz-SignedHeaders=host%3Bx-amz-acl&x-amz-acl=public-read
2022-05-19 22:16:48.844 8469-8703/com.havanasun.loginplayground I/okhttp.OkHttpClient: Content-Type: image/jpeg
2022-05-19 22:16:48.844 8469-8703/com.havanasun.loginplayground I/okhttp.OkHttpClient: x-amz-acl: public-read
2022-05-19 22:16:48.896 8469-8703/com.havanasun.loginplayground I/okhttp.OkHttpClient: --> END PUT (binary -1-byte body omitted)
2022-05-19 22:16:49.503 8469-8703/com.havanasun.loginplayground I/okhttp.OkHttpClient: <-- 411 Length Required https://app-content.ams3.digitaloceanspaces.com/Files/Test/profilbild.webp?Content-Type=image%2Fwebp&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=CENSORED-Amz-SignedHeaders=host%3Bx-amz-acl&x-amz-acl=public-read (606ms)
2022-05-19 22:16:49.504 8469-8703/com.havanasun.loginplayground I/okhttp.OkHttpClient: content-length: 239
2022-05-19 22:16:49.504 8469-8703/com.havanasun.loginplayground I/okhttp.OkHttpClient: x-amz-request-id: tx000000000000004541b27-00622f61-20f93ecc-ams3c
2022-05-19 22:16:49.505 8469-8703/com.havanasun.loginplayground I/okhttp.OkHttpClient: accept-ranges: bytes
2022-05-19 22:16:49.505 8469-8703/com.havanasun.loginplayground I/okhttp.OkHttpClient: content-type: application/xml
2022-05-19 22:16:49.505 8469-8703/com.havanasun.loginplayground I/okhttp.OkHttpClient: date: Thu, 19 May 2022 15:16:49 GMT
2022-05-19 22:16:49.505 8469-8703/com.havanasun.loginplayground I/okhttp.OkHttpClient: cache-control: max-age=60
2022-05-19 22:16:49.506 8469-8703/com.havanasun.loginplayground I/okhttp.OkHttpClient: strict-transport-security: max-age=15552000; includeSubDomains; preload
2022-05-19 22:16:49.506 8469-8703/com.havanasun.loginplayground I/okhttp.OkHttpClient: connection: close
2022-05-19 22:16:49.506 8469-8703/com.havanasun.loginplayground I/okhttp.OkHttpClient: <?xml version=\"1.0\" encoding=\"UTF-8\"?><Error><Code>MissingContentLength</Code><BucketName>app-content</BucketName><RequestId>tx00000000000000fffb27-0062865f61-20f93ecc-ams3c</RequestId><HostId>20f93ecc-ams3c-ams3-zg03</HostId></Error>
2022-05-19 22:16:49.507 8469-8703/com.havanasun.loginplayground I/okhttp.OkHttpClient: <-- END HTTP (239-byte body)

我有强烈的感觉，我不能只将 InputStreamRequestBody 的实例作为 requestBody 传递，即使这个类继承自 RequestBody。

标签： android kotlin file-upload retrofit2 okhttp

【解决方案1】：

我已经使用 InputStreamRequestBody 进行 POST 上传，我很确定 PUT 应该是一样的。

您需要使用MultipartBody.Builder() 构建您发送的带有多部分正文的最终正文

您的请求应该类似于此行。然后通过requestBody进行改造

val requestBody = MultipartBody.Builder()
  .setType(MultipartBody.FORM)
  // TODO add other form elements here
  .addFormDataPart("file-key", "file-name.jpeg", contentPart)
  .build()

归功于那篇教会我的文章：https://commonsware.com/blog/2020/07/05/multipart-upload-okttp-uri.html

【讨论】：