Follow these steps to set the environment variables.
Java
Add the following dependencies to your Maven project.
<!-- https://mvnrepository.com/artifact/com.aliyun/credentials-java -->
<dependency>
<groupId>com.aliyun.oss</groupId>
<artifactId>aliyun-sdk-oss</artifactId>
<version>3.17.4</version>
</dependency>
<dependency>
<groupId>com.aliyun</groupId>
<artifactId>sts20150401</artifactId>
<version>1.1.6</version>
</dependency>
The following sample code shows how to obtain a temporary access credential and calculate a POST signature on the server:
package com.aliyun.oss.web;
import com.aliyun.sts20150401.models.AssumeRoleResponse;
import com.aliyun.sts20150401.models.AssumeRoleResponseBody;
import com.aliyun.tea.TeaException;
import com.aliyun.oss.common.utils.BinaryUtil;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.apache.commons.codec.binary.Base64;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import java.time.*;
import java.time.format.DateTimeFormatter;
import java.util.*;
@Controller
public class WebController {
// Basic OSS information. Replace with your actual bucket name, region ID, and host.
String bucket = "examplebucket";
String region = "cn-hangzhou";
String host = "http://examplebucket.oss-cn-hangzhou.aliyuncs.com";
// Set the upload callback URL, which is the address of your callback server. This must be a public URL. OSS uses this URL to send object upload information to your application server.
// The prefix (directory) for objects to be uploaded to OSS.
String upload_dir = "dir";
// The expiration time in seconds.
Long expire_time = 3600L;
/**
* Generates an expiration time based on a specified duration in seconds.
* @param seconds The duration in seconds.
* @return An ISO 8601 time string, such as "2014-12-01T12:00:00.000Z".
*/
public static String generateExpiration(long seconds) {
// Get the current timestamp in seconds.
long now = Instant.now().getEpochSecond();
// Calculate the expiration timestamp.
long expirationTime = now + seconds;
// Convert the timestamp to an Instant object and format it to ISO 8601.
Instant instant = Instant.ofEpochSecond(expirationTime);
// Define the time zone as UTC.
ZoneId zone = ZoneOffset.UTC;
// Convert the Instant to a ZonedDateTime.
ZonedDateTime zonedDateTime = instant.atZone(zone);
// Define the date-time format, for example, 2023-12-03T13:00:00.000Z.
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'");
// Format the date and time.
String formattedDate = zonedDateTime.format(formatter);
// Return the result.
return formattedDate;
}
// Initialize the STS client.
public static com.aliyun.sts20150401.Client createStsClient() throws Exception {
// Hardcoding an AccessKey pair is a security risk and not recommended. This code is for reference only.
com.aliyun.teaopenapi.models.Config config = new com.aliyun.teaopenapi.models.Config()
// Required. Make sure that the OSS_ACCESS_KEY_ID environment variable is set in your code's runtime environment.
.setAccessKeyId(System.getenv("OSS_ACCESS_KEY_ID"))
// Required. Make sure that the OSS_ACCESS_KEY_SECRET environment variable is set in your code's runtime environment.
.setAccessKeySecret(System.getenv("OSS_ACCESS_KEY_SECRET"));
// For more information about endpoints, see https://api.aliyun.com/product/Sts.
config.endpoint = "sts.cn-hangzhou.aliyuncs.com";
return new com.aliyun.sts20150401.Client(config);
}
/**
* Obtain an STS temporary credential.
* @return An AssumeRoleResponseBodyCredentials object.
*/
public static AssumeRoleResponseBody.AssumeRoleResponseBodyCredentials getCredential() throws Exception {
com.aliyun.sts20150401.Client client = WebController.createStsClient();
com.aliyun.sts20150401.models.AssumeRoleRequest assumeRoleRequest = new com.aliyun.sts20150401.models.AssumeRoleRequest()
// Required. Make sure that the OSS_STS_ROLE_ARN environment variable is set in your code's runtime environment.
.setRoleArn(System.getenv("OSS_STS_ROLE_ARN"))
.setRoleSessionName("yourRoleSessionName");// A custom session name.
com.aliyun.teautil.models.RuntimeOptions runtime = new com.aliyun.teautil.models.RuntimeOptions();
try {
// If you copy this code to run, print the API return value.
AssumeRoleResponse response = client.assumeRoleWithOptions(assumeRoleRequest, runtime);
// The credentials object contains the AccessKeyId, AccessKeySecret, and SecurityToken.
return response.body.credentials;
} catch (TeaException error) {
// This is for demonstration only. Handle exceptions with caution and do not ignore them in your project.
// Error message
System.out.println(error.getMessage());
// Diagnostic address
System.out.println(error.getData().get("Recommend"));
com.aliyun.teautil.Common.assertAsString(error.message);
}
// Return a default error response object to avoid returning null.
AssumeRoleResponseBody.AssumeRoleResponseBodyCredentials defaultCredentials = new AssumeRoleResponseBody.AssumeRoleResponseBodyCredentials();
defaultCredentials.accessKeyId = "ERROR_ACCESS_KEY_ID";
defaultCredentials.accessKeySecret = "ERROR_ACCESS_KEY_SECRET";
defaultCredentials.securityToken = "ERROR_SECURITY_TOKEN";
return defaultCredentials;
}
@GetMapping("/get_post_signature_for_oss_upload")
public ResponseEntity<Map<String, String>> getPostSignatureForOssUpload() throws Exception {
AssumeRoleResponseBody.AssumeRoleResponseBodyCredentials sts_data = getCredential();
String accesskeyid = sts_data.accessKeyId;
String accesskeysecret = sts_data.accessKeySecret;
String securitytoken = sts_data.securityToken;
// Get the date for x-oss-credential. This is the current date in yyyyMMdd format.
ZonedDateTime today = ZonedDateTime.now().withZoneSameInstant(java.time.ZoneOffset.UTC);
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyyMMdd");
String date = today.format(formatter);
// Get x-oss-date.
ZonedDateTime now = ZonedDateTime.now().withZoneSameInstant(java.time.ZoneOffset.UTC);
DateTimeFormatter formatter2 = DateTimeFormatter.ofPattern("yyyyMMdd'T'HHmmss'Z'");
String x_oss_date = now.format(formatter2);
// Step 1: Create a policy.
String x_oss_credential = accesskeyid + "/" + date + "/" + region + "/oss/aliyun_v4_request";
ObjectMapper mapper = new ObjectMapper();
Map<String, Object> policy = new HashMap<>();
policy.put("expiration", generateExpiration(expire_time));
List<Object> conditions = new ArrayList<>();
Map<String, String> bucketCondition = new HashMap<>();
bucketCondition.put("bucket", bucket);
conditions.add(bucketCondition);
Map<String, String> securityTokenCondition = new HashMap<>();
securityTokenCondition.put("x-oss-security-token", securitytoken);
conditions.add(securityTokenCondition);
Map<String, String> signatureVersionCondition = new HashMap<>();
signatureVersionCondition.put("x-oss-signature-version", "OSS4-HMAC-SHA256");
conditions.add(signatureVersionCondition);
Map<String, String> credentialCondition = new HashMap<>();
credentialCondition.put("x-oss-credential", x_oss_credential); // Replace with your actual AccessKey ID.
conditions.add(credentialCondition);
Map<String, String> dateCondition = new HashMap<>();
dateCondition.put("x-oss-date", x_oss_date);
conditions.add(dateCondition);
conditions.add(Arrays.asList("content-length-range", 1, 10240000));
conditions.add(Arrays.asList("eq", "$success_action_status", "200"));
conditions.add(Arrays.asList("starts-with", "$key", upload_dir));
policy.put("conditions", conditions);
String jsonPolicy = mapper.writeValueAsString(policy);
// Step 2: Construct the string to sign.
String stringToSign = new String(Base64.encodeBase64(jsonPolicy.getBytes()));
// System.out.println("stringToSign: " + stringToSign);
// Step 3: Calculate the signing key.
byte[] dateKey = hmacsha256(("aliyun_v4" + accesskeysecret).getBytes(), date);
byte[] dateRegionKey = hmacsha256(dateKey, region);
byte[] dateRegionServiceKey = hmacsha256(dateRegionKey, "oss");
byte[] signingKey = hmacsha256(dateRegionServiceKey, "aliyun_v4_request");
// System.out.println("signingKey: " + BinaryUtil.toBase64String(signingKey));
// Step 4: Calculate the signature.
byte[] result = hmacsha256(signingKey, stringToSign);
String signature = BinaryUtil.toHex(result);
// System.out.println("signature:" + signature);
Map<String, String> response = new HashMap<>();
// Add the data to the map.
response.put("version", "OSS4-HMAC-SHA256");
response.put("policy", stringToSign);
response.put("x_oss_credential", x_oss_credential);
response.put("x_oss_date", x_oss_date);
response.put("signature", signature);
response.put("security_token", securitytoken);
response.put("dir", upload_dir);
response.put("host", host);
// Return a ResponseEntity with status code 200 (OK) to the web client for the PostObject operation.
return ResponseEntity.ok(response);
}
public static byte[] hmacsha256(byte[] key, String data) {
try {
// Initialize the HmacSHA256 key specification.
SecretKeySpec secretKeySpec = new SecretKeySpec(key, "HmacSHA256");
// Get an HmacSHA256 Mac instance.
Mac mac = Mac.getInstance("HmacSHA256");
// Initialize the Mac object with the key.
mac.init(secretKeySpec);
// Calculate the HMAC signature for the data.
byte[] hmacBytes = mac.doFinal(data.getBytes());
return hmacBytes;
} catch (Exception e) {
throw new RuntimeException("Failed to calculate HMAC-SHA256", e);
}
}
}
Python
Run the following commands to install dependencies.
pip install flask
pip install alibabacloud_tea_openapi alibabacloud_sts20150401 alibabacloud_credentials
The following sample code shows how to obtain a temporary access credential (STS token), construct an upload policy, and calculate a POST signature on the server.
from flask import Flask, render_template, jsonify
from alibabacloud_tea_openapi.models import Config
from alibabacloud_sts20150401.client import Client as Sts20150401Client
from alibabacloud_sts20150401 import models as sts_20150401_models
from alibabacloud_credentials.client import Client as CredentialClient
import os
import json
import base64
import hmac
import datetime
import time
import hashlib
app = Flask(__name__)
# Configure the OSS_ACCESS_KEY_ID, OSS_ACCESS_KEY_SECRET, and OSS_STS_ROLE_ARN environment variables.
access_key_id = os.environ.get('OSS_ACCESS_KEY_ID')
access_key_secret = os.environ.get('OSS_ACCESS_KEY_SECRET')
role_arn_for_oss_upload = os.environ.get('OSS_STS_ROLE_ARN')
# A custom session name.
role_session_name = 'yourRoleSessionName'
# Replace with your actual bucket name, region ID, and host.
bucket = 'examplebucket'
region_id = 'cn-hangzhou'
host = 'http://examplebucket.oss-cn-hangzhou.aliyuncs.com'
# The expiration time in seconds.
expire_time = 3600
# The prefix (directory) for objects to be uploaded to OSS.
upload_dir = 'dir'
def hmacsha256(key, data):
"""
Calculates the HMAC-SHA256 hash value.
:param key: The key for calculating the hash, in bytes.
:param data: The data to be hashed, as a string.
:return: The calculated HMAC-SHA256 hash value, in bytes.
"""
try:
mac = hmac.new(key, data.encode(), hashlib.sha256)
hmacBytes = mac.digest()
return hmacBytes
except Exception as e:
raise RuntimeError(f"Failed to calculate HMAC-SHA256 due to {e}")
@app.route("/")
def hello_world():
return render_template('index.html')
@app.route('/get_post_signature_for_oss_upload', methods=['GET'])
def generate_upload_params():
# Initialize the configuration and pass the credentials directly.
config = Config(
region_id=region_id,
access_key_id=access_key_id,
access_key_secret=access_key_secret
)
# Create an STS client and obtain a temporary credential.
sts_client = Sts20150401Client(config=config)
assume_role_request = sts_20150401_models.AssumeRoleRequest(
role_arn=role_arn_for_oss_upload,
role_session_name=role_session_name
)
response = sts_client.assume_role(assume_role_request)
token_data = response.body.credentials.to_map()
# Use the temporary credential returned by STS.
temp_access_key_id = token_data['AccessKeyId']
temp_access_key_secret = token_data['AccessKeySecret']
security_token = token_data['SecurityToken']
now = int(time.time())
# Convert the timestamp to a datetime object.
dt_obj = datetime.datetime.utcfromtimestamp(now)
# Add 3 hours to the current time to set the request expiration time.
dt_obj_plus_3h = dt_obj + datetime.timedelta(hours=3)
# Request time.
dt_obj_1 = dt_obj.strftime('%Y%m%dT%H%M%S') + 'Z'
# Request date.
dt_obj_2 = dt_obj.strftime('%Y%m%d')
# Request expiration time.
expiration_time = dt_obj_plus_3h.strftime('%Y-%m-%dT%H:%M:%S.000Z')
# Construct the policy and generate the signature.
policy = {
"expiration": expiration_time,
"conditions": [
["eq", "$success_action_status", "200"],
{"x-oss-signature-version": "OSS4-HMAC-SHA256"},
{"x-oss-credential": f"{temp_access_key_id}/{dt_obj_2}/cn-hangzhou/oss/aliyun_v4_request"},
{"x-oss-security-token": security_token},
{"x-oss-date": dt_obj_1},
]
}
print(dt_obj_1)
policy_str = json.dumps(policy).strip()
# Step 2: Construct the string to sign.
stringToSign = base64.b64encode(policy_str.encode()).decode()
# Step 3: Calculate the signing key.
dateKey = hmacsha256(("aliyun_v4" + temp_access_key_secret).encode(), dt_obj_2)
dateRegionKey = hmacsha256(dateKey, "cn-hangzhou")
dateRegionServiceKey = hmacsha256(dateRegionKey, "oss")
signingKey = hmacsha256(dateRegionServiceKey, "aliyun_v4_request")
# Step 4: Calculate the signature.
result = hmacsha256(signingKey, stringToSign)
signature = result.hex()
# Construct the response data.
response_data = {
'policy': stringToSign, # The policy form field.
'x_oss_signature_version': "OSS4-HMAC-SHA256", # The signature version and algorithm. This is fixed to OSS4-HMAC-SHA256.
'x_oss_credential': f"{temp_access_key_id}/{dt_obj_2}/cn-hangzhou/oss/aliyun_v4_request", # Specifies the credential scope.
'x_oss_date': dt_obj_1, # The request time.
'signature': signature, # The calculated signature.
'host': host,
'dir': upload_dir,
'security_token': security_token # The security token.
}
return jsonify(response_data)
if __name__ == "__main__":
app.run(host="127.0.0.1", port=8000) # If you need to listen on other addresses such as 0.0.0.0, you must add a server-side authentication mechanism.
Node.js
Run the following commands to install dependencies.
npm install ali-oss
npm install @alicloud/credentials
npm install express
The following sample code shows how to obtain a temporary access credential (STS token), construct an upload policy, and calculate a POST signature on the server.
const express = require('express');
const OSS = require('ali-oss');
const { STS } = require('ali-oss');
const { getCredential } = require('ali-oss/lib/common/signUtils');
const { getStandardRegion } = require('ali-oss/lib/common/utils/getStandardRegion');
const { policy2Str } = require('ali-oss/lib/common/utils/policy2Str');
const app = express();
const PORT = process.env.PORT || 8000; // The port number for service requests.
// Set the static file directory.
app.use(express.static('templates'));
const GenerateSignature = async () => {
// Initialize the STS client.
let sts = new STS({
accessKeyId: process.env.OSS_ACCESS_KEY_ID, // Get the AccessKey ID of the RAM user from the environment variable.
accessKeySecret: process.env.OSS_ACCESS_KEY_SECRET // Get the AccessKey Secret of the RAM user from the environment variable.
});
// Call the assumeRole operation to obtain a temporary STS access credential.
const result = await sts.assumeRole(process.env.OSS_STS_ROLE_ARN, '', '3600', 'yourRoleSessionName'); // Get the RAM role ARN from the environment variable. The temporary access credential is valid for 3,600 seconds, and the role session name is a custom value, such as yourRoleSessionName.
// Extract the AccessKeyId, AccessKeySecret, and SecurityToken from the temporary access credential.
const accessKeyId = result.credentials.AccessKeyId;
const accessKeySecret = result.credentials.AccessKeySecret;
const securityToken = result.credentials.SecurityToken;
// Initialize the OSS client.
const client = new OSS({
bucket: 'examplebucket', // Replace with the name of the destination bucket.
region: 'cn-hangzhou', // Replace with the region of the destination bucket.
accessKeyId,
accessKeySecret,
stsToken: securityToken,
refreshSTSTokenInterval: 0,
refreshSTSToken: async () => {
const { accessKeyId, accessKeySecret, securityToken } = await client.getCredential();
return { accessKeyId, accessKeySecret, stsToken: securityToken };
},
});
// Create a form data map.
const formData = new Map();
// Set the signature expiration time to 10 minutes from the current time.
const date = new Date();
const expirationDate = new Date(date);
expirationDate.setMinutes(date.getMinutes() + 10);
// Format the date to a UTC time string that complies with ISO 8601.
function padTo2Digits(num) {
return num.toString().padStart(2, '0');
}
function formatDateToUTC(date) {
return (
date.getUTCFullYear() +
padTo2Digits(date.getUTCMonth() + 1) +
padTo2Digits(date.getUTCDate()) +
'T' +
padTo2Digits(date.getUTCHours()) +
padTo2Digits(date.getUTCMinutes()) +
padTo2Digits(date.getUTCSeconds()) +
'Z'
);
}
const formattedDate = formatDateToUTC(expirationDate);
// Generate x-oss-credential and set the form data.
const credential = getCredential(formattedDate.split('T')[0], getStandardRegion(client.options.region), client.options.accessKeyId);
formData.set('x_oss_date', formattedDate);
formData.set('x_oss_credential', credential);
formData.set('x_oss_signature_version', 'OSS4-HMAC-SHA256');
// Create the policy.
// This example policy lists only the required conditions.
const policy = {
expiration: expirationDate.toISOString(),
conditions: [
{ 'bucket': 'examplebucket'},
{ 'x-oss-credential': credential },
{ 'x-oss-signature-version': 'OSS4-HMAC-SHA256' },
{ 'x-oss-date': formattedDate },
],
};
// If an STS token exists, add it to the policy and form data.
if (client.options.stsToken) {
policy.conditions.push({ 'x-oss-security-token': client.options.stsToken });
formData.set('security_token', client.options.stsToken);
}
// Generate the signature and set the form data.
const signature = client.signPostObjectPolicyV4(policy, date);
formData.set('policy', Buffer.from(policy2Str(policy), 'utf8').toString('base64'));
formData.set('signature', signature);
// Return the form data.
return {
host: `http://${client.options.bucket}.oss-${client.options.region}.aliyuncs.com`,
policy: Buffer.from(policy2Str(policy), 'utf8').toString('base64'),
x_oss_signature_version: 'OSS4-HMAC-SHA256',
x_oss_credential: credential,
x_oss_date: formattedDate,
signature: signature,
dir: 'user-dir', // The prefix (directory) for the object to be uploaded to OSS.
security_token: client.options.stsToken
};
};
app.get('/get_post_signature_for_oss_upload', async (req, res) => {
try {
const result = await GenerateSignature();
res.json(result); // Return the generated signature data.
} catch (error) {
console.error('Error generating signature:', error);
res.status(500).send('Error generating signature');
}
});
app.listen(PORT, () => {
console.log(`Server is running on http://127.0.0.1:${PORT}`); // If you need to listen on other addresses such as 0.0.0.0, you must add a server-side authentication mechanism.
});
Go
Run the following commands to install dependencies.
go get -u github.com/aliyun/credentials-go
go mod tidy
The following sample code shows how to obtain a temporary access credential (STS token), construct an upload policy, and calculate a POST signature on the server.
package main
import (
"crypto/hmac"
"crypto/sha256"
"encoding/base64"
"encoding/hex"
"encoding/json"
"fmt"
"io"
"hash"
"log"
"net/http"
"os"
"time"
"github.com/aliyun/credentials-go/credentials"
)
// Define global variables.
var (
region string
bucketName string
product = "oss"
)
// The PolicyToken struct stores the generated form data.
type PolicyToken struct {
Policy string `json:"policy"`
SecurityToken string `json:"security_token"`
SignatureVersion string `json:"x_oss_signature_version"`
Credential string `json:"x_oss_credential"`
Date string `json:"x_oss_date"`
Signature string `json:"signature"`
Host string `json:"host"`
Dir string `json:"dir"`
}
func main() {
// Define the default IP address and port string.
strIPPort := ":8000"
if len(os.Args) == 3 {
strIPPort = fmt.Sprintf("%s:%s", os.Args[1], os.Args[2])
} else if len(os.Args) != 1 {
fmt.Println("Usage : go run test1.go ")
fmt.Println("Usage : go run test1.go ip port ")
fmt.Println("")
os.Exit(0)
}
// Print the address and port on which the server is running.
fmt.Printf("server is running on %s \n", strIPPort)
// Register the function to handle root path requests.
http.HandleFunc("/", handlerRequest)
// Register the function to handle signature generation requests.
http.HandleFunc("/get_post_signature_for_oss_upload", handleGetPostSignature)
// Start the HTTP server.
err := http.ListenAndServe(strIPPort, nil)
if err != nil {
strError := fmt.Sprintf("http.ListenAndServe failed : %s \n", err.Error())
panic(strError)
}
}
// The handlerRequest function handles root path requests.
func handlerRequest(w http.ResponseWriter, r *http.Request) {
if r.Method == "GET" {
http.ServeFile(w, r, "templates/index.html")
return
}
http.NotFound(w, r)
}
// The handleGetPostSignature function handles signature generation requests.
func handleGetPostSignature(w http.ResponseWriter, r *http.Request) {
if r.Method == "GET" {
response := getPolicyToken()
w.Header().Set("Content-Type", "application/json")
w.Header().Set("Access-Control-Allow-Origin", "*") // Allow cross-origin requests.
w.Write([]byte(response))
return
}
http.NotFound(w, r)
}
// The getPolicyToken function generates the signature and credentials required for OSS uploads.
func getPolicyToken() string {
// Set the region of the bucket.
region = "cn-hangzhou"
// Replace with your bucket name.
bucketName = "examplebucket"
// Set the OSS upload address.
host := fmt.Sprintf("https://%s.oss-%s.aliyuncs.com", bucketName, region)
// Set the upload directory.
dir := "user-dir"
config := new(credentials.Config).
SetType("ram_role_arn").
SetAccessKeyId(os.Getenv("OSS_ACCESS_KEY_ID")).
SetAccessKeySecret(os.Getenv("OSS_ACCESS_KEY_SECRET")).
SetRoleArn("OSS_STS_ROLE_ARN").
SetRoleSessionName("Role_Session_Name").
SetPolicy("").
SetRoleSessionExpiration(3600)
// Create a credential provider based on the configuration.
provider, err := credentials.NewCredential(config)
if err != nil {
log.Fatalf("NewCredential fail, err:%v", err)
}
// Obtain credentials from the credential provider.
cred, err := provider.GetCredential()
if err != nil {
log.Fatalf("GetCredential fail, err:%v", err)
}
// Construct the policy.
utcTime := time.Now().UTC()
date := utcTime.Format("20060102")
expiration := utcTime.Add(1 * time.Hour)
policyMap := map[string]any{
"expiration": expiration.Format("2006-01-02T15:04:05.000Z"),
"conditions": []any{
map[string]string{"bucket": bucketName},
map[string]string{"x-oss-signature-version": "OSS4-HMAC-SHA256"},
map[string]string{"x-oss-credential": fmt.Sprintf("%v/%v/%v/%v/aliyun_v4_request", *cred.AccessKeyId, date, region, product)},
map[string]string{"x-oss-date": utcTime.Format("20060102T150405Z")},
map[string]string{"x-oss-security-token": *cred.SecurityToken},
},
}
// Convert the policy to JSON format.
policy, err := json.Marshal(policyMap)
if err != nil {
log.Fatalf("json.Marshal fail, err:%v", err)
}
// Construct the string to sign.
stringToSign := base64.StdEncoding.EncodeToString([]byte(policy))
hmacHash := func() hash.Hash { return sha256.New() }
// Construct the signing key.
signingKey := "aliyun_v4" + *cred.AccessKeySecret
h1 := hmac.New(hmacHash, []byte(signingKey))
io.WriteString(h1, date)
h1Key := h1.Sum(nil)
h2 := hmac.New(hmacHash, h1Key)
io.WriteString(h2, region)
h2Key := h2.Sum(nil)
h3 := hmac.New(hmacHash, h2Key)
io.WriteString(h3, product)
h3Key := h3.Sum(nil)
h4 := hmac.New(hmacHash, h3Key)
io.WriteString(h4, "aliyun_v4_request")
h4Key := h4.Sum(nil)
// Generate the signature.
h := hmac.New(hmacHash, h4Key)
io.WriteString(h, stringToSign)
signature := hex.EncodeToString(h.Sum(nil))
// Construct the form to be returned to the client.
policyToken := PolicyToken{
Policy: stringToSign,
SecurityToken: *cred.SecurityToken,
SignatureVersion: "OSS4-HMAC-SHA256",
Credential: fmt.Sprintf("%v/%v/%v/%v/aliyun_v4_request", *cred.AccessKeyId, date, region, product),
Date: utcTime.UTC().Format("20060102T150405Z"),
Signature: signature,
Host: host, // The OSS upload address.
Dir: dir, // The upload directory.
}
response, err := json.Marshal(policyToken)
if err != nil {
fmt.Println("json err:", err)
}
return string(response)
}
PHP
Run the following command to install dependencies.
composer install
The following sample code shows how to obtain a temporary access credential (STS token), construct an upload policy, and calculate a POST signature on the server.
<?php
// Import the Alibaba Cloud SDK.
require_once __DIR__ . '/vendor/autoload.php';
use AlibabaCloud\Client\AlibabaCloud;
use AlibabaCloud\Client\Exception\ClientException;
use AlibabaCloud\Client\Exception\ServerException;
use AlibabaCloud\Sts\Sts;
// Disable error display.
ini_set('display_errors', '0');
$bucket = 'examplebucket'; // Replace with your bucket name.
$region_id = 'cn-hangzhou'; // Replace with the region of your bucket.
$host = 'http://examplebucket.oss-cn-hangzhou.aliyuncs.com'; // Replace with your bucket's domain name.
$expire_time = 3600; // The expiration time in seconds.
$upload_dir = 'user-dir'; // The prefix (directory) for uploaded objects.
// Calculate HMAC-SHA256.
function hmacsha256($key, $data) {
return hash_hmac('sha256', $data, $key, true);
}
// Handle the request to get the POST signature.
if ($_SERVER['REQUEST_METHOD'] === 'GET' && $_SERVER['REQUEST_URI'] === '/get_post_signature_for_oss_upload') {
AlibabaCloud::accessKeyClient(getenv('OSS_ACCESS_KEY_ID'), getenv('OSS_ACCESS_KEY_SECRET'))
->regionId('cn-hangzhou')
->asDefaultClient();
// Create an STS request.
$request = Sts::v20150401()->assumeRole();
// Initiate the STS request and get the result.
// Set <YOUR_ROLE_SESSION_NAME> to a custom session name, such as oss-role-session.
// Replace <YOUR_ROLE_ARN> with the ARN of a RAM role that has permission to upload files to the specified OSS bucket.
$result = $request
->withRoleSessionName('oss-role-session')
->withDurationSeconds(3600)
->withRoleArn(getenv('OSS_STS_ROLE_ARN'))
->request();
// Get the credential information from the STS request result.
$tokenData = $result->get('Credentials');
// Construct the JSON data to return.
$tempAccessKeyId = $tokenData['AccessKeyId'];
$tempAccessKeySecret = $tokenData['AccessKeySecret'];
$securityToken = $tokenData['SecurityToken'];
$now = time();
$dtObj = gmdate('Ymd\THis\Z', $now);
$dtObj1 = gmdate('Ymd', $now);
$dtObjPlus3h = gmdate('Y-m-d\TH:i:s.u\Z', strtotime('+3 hours', $now));
// Construct the policy.
$policy = [
"expiration" => $dtObjPlus3h,
"conditions" => [
["x-oss-signature-version" => "OSS4-HMAC-SHA256"],
["x-oss-credential" => "{$tempAccessKeyId}/{$dtObj1}/cn-hangzhou/oss/aliyun_v4_request"],
["x-oss-security-token" => $securityToken],
["x-oss-date" => $dtObj],
]
];
$policyStr = json_encode($policy);
// Construct the string to sign.
$stringToSign = base64_encode($policyStr);
// Calculate the signing key.
$dateKey = hmacsha256(('aliyun_v4' . $tempAccessKeySecret), $dtObj1);
$dateRegionKey = hmacsha256($dateKey, 'cn-hangzhou');
$dateRegionServiceKey = hmacsha256($dateRegionKey, 'oss');
$signingKey = hmacsha256($dateRegionServiceKey, 'aliyun_v4_request');
// Calculate the signature.
$result = hmacsha256($signingKey, $stringToSign);
$signature = bin2hex($result);
// Return the signature data.
$responseData = [
'policy' => $stringToSign,
'x_oss_signature_version' => "OSS4-HMAC-SHA256",
'x_oss_credential' => "{$tempAccessKeyId}/{$dtObj1}/cn-hangzhou/oss/aliyun_v4_request",
'x_oss_date' => $dtObj,
'signature' => $signature,
'host' => $host,
'dir' => $upload_dir,
'security_token' => $securityToken
];
header('Content-Type: application/json');
echo json_encode($responseData);
exit;
}
// Home page route.
if ($_SERVER['REQUEST_METHOD'] === 'GET' && $_SERVER['REQUEST_URI'] === '/') {
echo file_get_contents(__DIR__ . '/public/index.html');
exit;
}
// Other routes.
http_response_code(404);
echo json_encode(['message' => 'Not Found']);
exit;
?>
in the Actions column.