124 lines
3.7 KiB
Go
124 lines
3.7 KiB
Go
package ali
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import (
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"crypto/hmac"
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"crypto/sha256"
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"encoding/base64"
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"encoding/hex"
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"encoding/json"
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"fmt"
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"hash"
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"io"
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"strings"
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"time"
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"github.com/aliyun/credentials-go/credentials"
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"github.com/pkg/errors"
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)
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func (c *Config) GetToken(path string) (*PolicyToken, error) {
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product := "oss"
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host := fmt.Sprintf("https://%s.oss-%s.aliyuncs.com", c.Bucket, c.Region)
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if c.Host != nil {
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host = *c.Host
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}
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// 设置上传目录
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dir := strings.TrimRight(path, "/") + "/"
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// callbackUrl为 上传回调服务器的URL，请将下面的IP和Port配置为您自己的真实信息。
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config := new(credentials.Config).
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SetType("access_key").
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SetAccessKeyId(c.AccessKeyId).
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SetAccessKeySecret(c.AccessKeySecret).
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SetPolicy("")
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// SetType("ram_role_arn").
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// SetRoleArn(os.Getenv("OSS_STS_ROLE_ARN")).
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// SetRoleSessionName("Role_Session_Name").
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// SetRoleSessionExpiration(3600)
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// 根据配置创建凭证提供器
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provider, err := credentials.NewCredential(config)
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if err != nil {
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return nil, errors.Wrap(err, "NewCredential fail")
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}
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// 从凭证提供器获取凭证
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cred, err := provider.GetCredential()
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if err != nil {
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return nil, errors.Wrap(err, "GetCredential fail")
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}
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// 构建policy
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utcTime := time.Now().UTC()
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date := utcTime.Format("20060102")
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expiration := utcTime.Add(1 * time.Hour)
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policyMap := map[string]any{
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"expiration": expiration.Format("2006-01-02T15:04:05.000Z"),
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"conditions": []any{
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map[string]string{"bucket": c.Bucket},
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map[string]string{"x-oss-signature-version": "OSS4-HMAC-SHA256"},
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map[string]string{"x-oss-credential": fmt.Sprintf("%v/%v/%v/%v/aliyun_v4_request", *cred.AccessKeyId, date, c.Region, product)},
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map[string]string{"x-oss-date": utcTime.Format("20060102T150405Z")},
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map[string]string{"x-oss-security-token": *cred.SecurityToken},
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},
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}
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// 将policy转换为 JSON 格式
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policy, err := json.Marshal(policyMap)
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if err != nil {
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return nil, errors.Wrap(err, "json.Marshal fail")
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}
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// 构造待签名字符串（StringToSign）
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stringToSign := base64.StdEncoding.EncodeToString([]byte(policy))
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hmacHash := func() hash.Hash { return sha256.New() }
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// 构建signing key
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signingKey := "aliyun_v4" + *cred.AccessKeySecret
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h1 := hmac.New(hmacHash, []byte(signingKey))
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io.WriteString(h1, date)
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h1Key := h1.Sum(nil)
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h2 := hmac.New(hmacHash, h1Key)
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io.WriteString(h2, c.Region)
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h2Key := h2.Sum(nil)
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h3 := hmac.New(hmacHash, h2Key)
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io.WriteString(h3, product)
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h3Key := h3.Sum(nil)
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h4 := hmac.New(hmacHash, h3Key)
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io.WriteString(h4, "aliyun_v4_request")
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h4Key := h4.Sum(nil)
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// 生成签名
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h := hmac.New(hmacHash, h4Key)
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io.WriteString(h, stringToSign)
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signature := hex.EncodeToString(h.Sum(nil))
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var callbackParam CallbackParam
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callbackParam.CallbackUrl = c.CallbackURL
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callbackParam.CallbackBody = "filename=${object}&size=${size}&mimeType=${mimeType}&height=${imageInfo.height}&width=${imageInfo.width}"
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callbackParam.CallbackBodyType = "application/x-www-form-urlencoded"
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callback_str, err := json.Marshal(callbackParam)
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if err != nil {
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fmt.Println("callback json err:", err)
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}
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callbackBase64 := base64.StdEncoding.EncodeToString(callback_str)
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// 构建返回给前端的表单
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return &PolicyToken{
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Policy: stringToSign,
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SecurityToken: *cred.SecurityToken,
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SignatureVersion: "OSS4-HMAC-SHA256",
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Credential: fmt.Sprintf("%v/%v/%v/%v/aliyun_v4_request", *cred.AccessKeyId, date, c.Region, product),
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Date: utcTime.UTC().Format("20060102T150405Z"),
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Signature: signature,
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Host: host, // 返回 OSS 上传地址
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Dir: dir, // 返回上传目录
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Callback: callbackBase64, // 返回上传回调参数
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}, nil
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}
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