forked from TrueCloudLab/distribution
115 lines
3.2 KiB
Go
Executable file
115 lines
3.2 KiB
Go
Executable file
package middleware
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import (
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"fmt"
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"net/url"
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"strings"
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"time"
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"github.com/docker/distribution/context"
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storagedriver "github.com/docker/distribution/registry/storage/driver"
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storagemiddleware "github.com/docker/distribution/registry/storage/driver/middleware"
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"github.com/denverdino/aliyungo/cdn/auth"
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)
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// aliCDNStorageMiddleware provides a simple implementation of layerHandler that
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// constructs temporary signed AliCDN URLs from the storagedriver layer URL,
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// then issues HTTP Temporary Redirects to this AliCDN content URL.
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type aliCDNStorageMiddleware struct {
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storagedriver.StorageDriver
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baseURL string
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urlSigner *auth.URLSigner
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duration time.Duration
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}
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var _ storagedriver.StorageDriver = &aliCDNStorageMiddleware{}
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// newAliCDNStorageMiddleware constructs and returns a new AliCDN
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// layerHandler implementation.
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// Required options: baseurl, authtype, privatekey
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// Optional options: duration
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func newAliCDNStorageMiddleware(storageDriver storagedriver.StorageDriver, options map[string]interface{}) (storagedriver.StorageDriver, error) {
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// parse baseurl
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base, ok := options["baseurl"]
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if !ok {
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return nil, fmt.Errorf("no baseurl provided")
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}
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baseURL, ok := base.(string)
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if !ok {
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return nil, fmt.Errorf("baseurl must be a string")
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}
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if !strings.Contains(baseURL, "://") {
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baseURL = "https://" + baseURL
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}
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if _, err := url.Parse(baseURL); err != nil {
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return nil, fmt.Errorf("invalid baseurl: %v", err)
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}
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// parse authtype
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at, ok := options["authtype"]
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if !ok {
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return nil, fmt.Errorf("no authtype provided")
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}
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authType, ok := at.(string)
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if !ok {
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return nil, fmt.Errorf("authtype must be a string")
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}
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if authType != "a" && authType != "b" && authType != "c" {
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return nil, fmt.Errorf("invalid authentication type")
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}
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// parse privatekey
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pk, ok := options["privatekey"]
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if !ok {
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return nil, fmt.Errorf("no privatekey provided")
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}
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privateKey, ok := pk.(string)
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if !ok {
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return nil, fmt.Errorf("privatekey must be a string")
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}
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urlSigner := auth.NewURLSigner(authType, privateKey)
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// parse duration
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duration := 60 * time.Minute
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d, ok := options["duration"]
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if ok {
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switch d := d.(type) {
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case time.Duration:
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duration = d
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case string:
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dur, err := time.ParseDuration(d)
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if err != nil {
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return nil, fmt.Errorf("invalid duration: %s", err)
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}
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duration = dur
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}
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}
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return &aliCDNStorageMiddleware{
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StorageDriver: storageDriver,
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baseURL: baseURL,
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urlSigner: urlSigner,
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duration: duration,
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}, nil
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}
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// URLFor attempts to find a url which may be used to retrieve the file at the given path.
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func (ac *aliCDNStorageMiddleware) URLFor(ctx context.Context, path string, options map[string]interface{}) (string, error) {
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if ac.StorageDriver.Name() != "oss" {
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context.GetLogger(ctx).Warn("the AliCDN middleware does not support this backend storage driver")
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return ac.StorageDriver.URLFor(ctx, path, options)
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}
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acURL, err := ac.urlSigner.Sign(ac.baseURL+path, time.Now().Add(ac.duration))
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if err != nil {
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return "", err
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}
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return acURL, nil
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}
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// init registers the alicdn layerHandler backend.
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func init() {
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storagemiddleware.Register("alicdn", storagemiddleware.InitFunc(newAliCDNStorageMiddleware))
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}
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