Object Storage Service:ドキュメント変換

前提条件

• Object Storage Service (OSS) にバケットを作成し、ソースドキュメントをバケットにアップロードし、そのバケットをIntelligent Media Management (IMM) プロジェクトに関連付けてください。IMM プロジェクトはバケットと同じリージョンにある必要があります。

• IMM によるドキュメント処理に必要な権限を保有している必要があります。

ドキュメントの変換

SDK を使用してドキュメント変換 API を呼び出し、変換後のファイルを指定されたバケットに保存できます。ドキュメント変換の非同期処理は、Java、Python、Go の SDK のみでサポートされています。

import com.aliyun.oss.ClientBuilderConfiguration;
import com.aliyun.oss.OSS;
import com.aliyun.oss.OSSClientBuilder;
import com.aliyun.oss.common.auth.CredentialsProviderFactory;
import com.aliyun.oss.common.auth.EnvironmentVariableCredentialsProvider;
import com.aliyun.oss.common.comm.SignVersion;
import com.aliyun.oss.model.AsyncProcessObjectRequest;
import com.aliyun.oss.model.AsyncProcessObjectResult;
import com.aliyuncs.exceptions.ClientException;

import java.util.Base64;

public class Demo1 {
    public static void main(String[] args) throws ClientException {
        // Set endpoint to the endpoint of the region where the bucket is located.
        String endpoint = "https://oss-cn-hangzhou.aliyuncs.com";
        // Set region to the region ID, for example, cn-hangzhou.
        String region = "cn-hangzhou";
        // Obtain access credentials from environment variables. Before running this sample code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are configured.
        EnvironmentVariableCredentialsProvider credentialsProvider = CredentialsProviderFactory.newEnvironmentVariableCredentialsProvider();
        // Specify the bucket name.
        String bucketName = "examplebucket";
        // Specify the name of the destination file.
        String targetKey = "dest.png";
        // Specify the name of the source document.
        String sourceKey = "src.docx";

        // Create an OSSClient instance.
        // When the OSSClient instance is no longer needed, call the shutdown method to release its resources.
        ClientBuilderConfiguration clientBuilderConfiguration = new ClientBuilderConfiguration();
        clientBuilderConfiguration.setSignatureVersion(SignVersion.V4);
        OSS ossClient = OSSClientBuilder.create()
                .endpoint(endpoint)
                .credentialsProvider(credentialsProvider)
                .clientConfiguration(clientBuilderConfiguration)
                .region(region)
                .build();

        try {
            // Build the string for document processing styles and conversion parameters.
            String style = String.format("doc/convert,target_png,source_docx");
            // Build the asynchronous processing instruction.
            String bucketEncoded = Base64.getUrlEncoder().withoutPadding().encodeToString(bucketName.getBytes());
            String targetEncoded = Base64.getUrlEncoder().withoutPadding().encodeToString(targetKey.getBytes());
            String process = String.format("%s|sys/saveas,b_%s,o_%s", style, bucketEncoded, targetEncoded);
            // Create an AsyncProcessObjectRequest object.
            AsyncProcessObjectRequest request = new AsyncProcessObjectRequest(bucketName, sourceKey, process);
            // Initiate the asynchronous task.
            AsyncProcessObjectResult response = ossClient.asyncProcessObject(request);
            System.out.println("EventId: " + response.getEventId());
            System.out.println("RequestId: " + response.getRequestId());
            System.out.println("TaskId: " + response.getTaskId());

        } finally {
            // Shut down the OSSClient instance.
            ossClient.shutdown();
        }
    }
}

# -*- coding: utf-8 -*-
import base64
import oss2
from oss2.credentials import EnvironmentVariableCredentialsProvider

def main():
    # Obtain access credentials from environment variables. Before running this sample code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are configured.
    auth = oss2.ProviderAuthV4(EnvironmentVariableCredentialsProvider())
    # Set endpoint to the endpoint of the region where the bucket is located. For example, for China (Hangzhou), set the endpoint to https://oss-cn-hangzhou.aliyuncs.com.
    endpoint = 'https://oss-cn-hangzhou.aliyuncs.com'
    # Specify the general-purpose Alibaba Cloud region ID, for example, cn-hangzhou.
    region = 'cn-hangzhou'

    # Specify the bucket name, for example, examplebucket.
    bucket = oss2.Bucket(auth, endpoint, 'examplebucket', region=region)

    # Specify the name of the source document.
    source_key = 'src.docx'

    # Specify the name of the destination file.
    target_key = 'dest.png'

    # Build the string for document processing styles and conversion parameters.
    animation_style = 'doc/convert,target_png,source_docx'

    # Build the processing instruction, including the save path and the Base64-encoded bucket name and destination file name.
    bucket_name_encoded = base64.urlsafe_b64encode('examplebucket'.encode()).decode().rstrip('=')
    target_key_encoded = base64.urlsafe_b64encode(target_key.encode()).decode().rstrip('=')
    process = f"{animation_style}|sys/saveas,b_{bucket_name_encoded},o_{target_key_encoded}"

    try:
        # Initiate the asynchronous task.
        result = bucket.async_process_object(source_key, process)
        print(f"EventId: {result.event_id}")
        print(f"RequestId: {result.request_id}")
        print(f"TaskId: {result.task_id}")
    except Exception as e:
        print(f"Error: {e}")


if __name__ == "__main__":
    main()

package main

import (
    "encoding/base64"
    "fmt"
    "os"
    "github.com/aliyun/aliyun-oss-go-sdk/oss"
    "log"
)

func main() {
    // Obtain access credentials from environment variables. Before running this sample code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are configured.
    provider, err := oss.NewEnvironmentVariableCredentialsProvider()
    if err != nil {
    fmt.Println("Error:", err)
    os.Exit(-1)
    }
    // Create an OSSClient instance.
    // Set the endpoint to the one for your bucket's region. For the China (Hangzhou) region, for example, use https://oss-cn-hangzhou.aliyuncs.com. Set the endpoint based on your actual region.
    // Specify the general-purpose Alibaba Cloud region ID, for example, cn-hangzhou.
    client, err := oss.New("https://oss-cn-hangzhou.aliyuncs.com", "", "", oss.SetCredentialsProvider(&provider), oss.AuthVersion(oss.AuthV4), oss.Region("cn-hangzhou"))
    if err != nil {
    fmt.Println("Error:", err)
    os.Exit(-1)
    }
    // Specify the bucket name, for example, examplebucket.
    bucketName := "examplebucket"

    bucket, err := client.Bucket(bucketName)
    if err != nil {
    fmt.Println("Error:", err)
    os.Exit(-1)
    }

    // Specify the name of the source document.
    sourceKey := "src.docx"
    // Specify the name of the destination file.
    targetKey := "dest.png"

    // Build the string for document processing styles and conversion parameters.
    animationStyle := "doc/convert,target_png,source_docx"

    // Build the processing instruction, including the save path and the Base64-encoded bucket name and destination file name.
    bucketNameEncoded := base64.URLEncoding.EncodeToString([]byte(bucketName))
    targetKeyEncoded := base64.URLEncoding.EncodeToString([]byte(targetKey))
    process := fmt.Sprintf("%s|sys/saveas,b_%v,o_%v", animationStyle, bucketNameEncoded, targetKeyEncoded)

    // Initiate the asynchronous task.
    result, err := bucket.AsyncProcessObject(sourceKey, process)
    if err != nil {
    log.Fatalf("Failed to async process object: %s", err)
    }

    fmt.Printf("EventId: %s\n", result.EventId)
    fmt.Printf("RequestId: %s\n", result.RequestId)
    fmt.Printf("TaskId: %s\n", result.TaskId)
}

ドキュメントの変換

• 変換前

  • ドキュメント形式：DOCX

  • ドキュメント名：example.docx

• 変換後

  • ファイル形式：PNG

  • 保存パス：oss://test-bucket/doc_images/{index}.png

    • b_dGVzdC1idWNrZXQ=：トランスコード完了後に test-bucket という名前のバケットに出力を保存します（dGVzdC1idWNrZXQ= は test-bucket の Base64 エンコード値です）。

    • o_ZG9jX2ltYWdlcy97aW5kZXh9LnBuZw==：オブジェクトを doc_images ディレクトリに保存します。{index} 変数は example.docx のページ番号に置き換えられ、イメージのファイル名が生成されます（ZG9jX2ltYWdlcy97aW5kZXh9LnBuZw== は doc_images/{index}.png の Base64 エンコード値です）。

  • 変換完了通知：Simple Message Queue (SMQ)（旧称 MNS）の test-topic という名前のトピックにメッセージが送信されます。

リクエスト例

// Convert the example.docx file to PNG images.
POST /example.docx?x-oss-async-process HTTP/1.1
Host: doc-demo.oss-cn-hangzhou.aliyuncs.com
Date: Fri, 28 Oct 2022 06:40:10 GMT
Authorization: SignatureValue

x-oss-async-process=doc/convert,target_png,source_docx|sys/saveas,b_dGVzdC1idWNrZXQ=,o_ZG9jX2ltYWdlcy97aW5kZXh9LnBuZw==/notify,topic_dGVzdC10b3BpYw

特定の Excel ワークシートを変換する方法

いいえ。OSS ドキュメント変換は Excel ワークブック内のすべてのワークシートを変換します。特定のワークシートを変換するには、IMM の CreateOfficeConversionTask 操作を呼び出し、SheetIndex パラメーターを設定してください。