Object Storage Service:OSS SDK for Goを使用したIMG

スタイル内に複数のIMGパラメータをカプセル化し、そのスタイルを使用してイメージを処理できます。 詳細については、「イメージスタイル」をご参照ください。 次のサンプルコードは、イメージスタイルを使用してイメージを処理する方法の例を示しています。

package main

import (
	"fmt"
	"os"

	"github.com/aliyun/aliyun-oss-go-sdk/oss"
)

func HandleError(err error) {
	fmt.Println("Error:", err)
	os.Exit(-1)
}

func main() {
	// Obtain access credentials from environment variables. Before you run the 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. 
	// Specify the endpoint of the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the endpoint to https://oss-cn-hangzhou.aliyuncs.com. Specify your actual endpoint. 
	// Specify the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the region to cn-hangzhou. Specify the actual region.
	clientOptions := []oss.ClientOption{oss.SetCredentialsProvider(&provider)}
	clientOptions = append(clientOptions, oss.Region("yourRegion"))
	// Specify the version of the signature algorithm.
	clientOptions = append(clientOptions, oss.AuthVersion(oss.AuthV4))
	client, err := oss.New("yourEndpoint", "", "", clientOptions...)
	if err != nil {
		fmt.Println("Error:", err)
		os.Exit(-1)
	}

	// Specify the name of the bucket in which the source image is stored. Example: examplebucket. 
	bucketName := "examplebucket"
	bucket, err := client.Bucket(bucketName)
	if err != nil {
		HandleError(err)
	}
	// Specify the name of the source image. If the source image is not stored in the root directory of the bucket, you must specify the full path of the image. Example: example/example.jpg. 
	sourceImageName := "example/example.jpg"
	// Save the processed image as newexample.jpg to your local computer. 
	targetImageName := "D:\\localpath\\newexample.jpg"
	// Use an image style to process the image. Set yourCustomStyleName to the name of the image style that you created in the OSS console. 
	style := "style/yourCustomStyleName"
	// Save the processed image to your local computer. 
	err = bucket.GetObjectToFile(sourceImageName, targetImageName, oss.Process(style))
	if err != nil {
		HandleError(err)
	}
}

ImgSaveAs操作を呼び出して、処理した画像を特定のバケットに保存できます。

package main

import (
	"encoding/base64"
	"fmt"
	"os"

	"github.com/aliyun/aliyun-oss-go-sdk/oss"
)

func HandleError(err error) {
    fmt.Println("Error:", err)
    os.Exit(-1)
}

func main() {
    // Obtain access credentials from environment variables. Before you run the 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. 
    // Specify the endpoint of the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the endpoint to https://oss-cn-hangzhou.aliyuncs.com. Specify your actual endpoint. 
    // Specify the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the region to cn-hangzhou. Specify the actual region.
    clientOptions := []oss.ClientOption{oss.SetCredentialsProvider(&provider)}
    clientOptions = append(clientOptions, oss.Region("yourRegion"))
    // Specify the version of the signature algorithm.
    clientOptions = append(clientOptions, oss.AuthVersion(oss.AuthV4))
    client, err := oss.New("yourEndpoint", "", "", clientOptions...)
    if err != nil {
	    HandleError(err)
    }

    // Specify the name of the bucket in which the source image is stored. Example: srcbucket. 
    bucketName := "SourceBucketName"
    bucket, err := client.Bucket(bucketName)
    if err != nil {
    HandleError(err)
    }
    // Specify the name of the source image. If the source image is not stored in the root directory of the bucket, you must specify the full path of the image. Example: example/example.jpg. 
    sourceImageName := "yourObjectName"
    // Specify the name of the bucket to which you want to store the processed image. The bucket must be located in the same region as the bucket in which the source image is stored. 
    targetBucketName := "TargetBucketName"
    // Specify the name of the processed image. If the processed image is not stored in the root directory of the bucket, you must specify the full path of the image. Example: exampledir/example.jpg. 
    targetImageName := "TargetObjectName"
    // Resize the image to 100 x 100 pixels and save the image to a specific bucket. 
    style := "image/resize,m_fixed,w_100,h_100"
    process := fmt.Sprintf("%s|sys/saveas,o_%v,b_%v", style, base64.URLEncoding.EncodeToString([]byte(targetImageName)), base64.URLEncoding.EncodeToString([]byte(targetBucketName)))
    result, err := bucket.ProcessObject(sourceImageName, process)
    if err != nil {
    HandleError(err)
    } else {
    fmt.Println(result)
    }
}

プライベートオブジェクトのURLが署名されています。 署名付きURLの末尾にIMGパラメーターを直接追加することはできません。 プライベートオブジェクトを処理する場合は、署名にIMGパラメーターを追加します。 次のサンプルコードは、署名にIMGパラメーターを追加する方法の例を示しています。

package main

import (
	"fmt"
	"os"

	"github.com/aliyun/aliyun-oss-go-sdk/oss"
)

func HandleError(err error) {
    fmt.Println("Error:", err)
    os.Exit(-1)
}

func main() {
    // Obtain access credentials from environment variables. Before you run the 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. 
    // Specify the endpoint of the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the endpoint to https://oss-cn-hangzhou.aliyuncs.com. Specify your actual endpoint. 
    // Specify the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the region to cn-hangzhou. Specify the actual region.
    clientOptions := []oss.ClientOption{oss.SetCredentialsProvider(&provider)}
    clientOptions = append(clientOptions, oss.Region("yourRegion"))
    // Specify the version of the signature algorithm.
    clientOptions = append(clientOptions, oss.AuthVersion(oss.AuthV4))
    client, err := oss.New("yourEndpoint", "", "", clientOptions...)
    if err != nil {
	    HandleError(err)
    }

    // Specify the name of the bucket in which the source image is stored. Example: examplebucket. 
    bucketName := "examplebucket"
    bucket, err := client.Bucket(bucketName)
    if err != nil {
    HandleError(err)
    }
    // Specify the name of the image. If the image is not stored in the root directory of the bucket, you must specify the full path of the image. Example: exampledir/example.jpg. 
    ossImageName := "exampledir/example.jpg"
    // Generate a signed URL that includes IMG parameters. Set the validity period of the signed URL to 600 seconds. (The maximum validity period is 32400 seconds.)
    signedURL, err := bucket.SignURL(ossImageName, oss.HTTPGet, 600, oss.Process("image/format,png"))
    if err != nil {
    HandleError(err)
    } else {
    fmt.Println(signedURL)
    }
}