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middleware.go
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middleware.go
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package middleware
import (
"context"
"fmt"
"net/url"
"strings"
storagedriver "github.com/distribution/distribution/v3/registry/storage/driver"
storagemiddleware "github.com/distribution/distribution/v3/registry/storage/driver/middleware"
)
func init() {
storagemiddleware.Register("rewrite", newRewriteStorageMiddleware)
}
type rewriteStorageMiddleware struct {
storagedriver.StorageDriver
overrideScheme string
overrideHost string
trimPathPrefix string
}
var _ storagedriver.StorageDriver = &rewriteStorageMiddleware{}
func getStringOption(key string, options map[string]interface{}) (string, error) {
o, ok := options[key]
if !ok {
return "", nil
}
s, ok := o.(string)
if !ok {
return "", fmt.Errorf("%s must be a string", key)
}
return s, nil
}
func newRewriteStorageMiddleware(ctx context.Context, sd storagedriver.StorageDriver, options map[string]interface{}) (storagedriver.StorageDriver, error) {
var err error
r := &rewriteStorageMiddleware{StorageDriver: sd}
if r.overrideScheme, err = getStringOption("scheme", options); err != nil {
return nil, err
}
if r.overrideHost, err = getStringOption("host", options); err != nil {
return nil, err
}
if r.trimPathPrefix, err = getStringOption("trimpathprefix", options); err != nil {
return nil, err
}
return r, nil
}
func (r *rewriteStorageMiddleware) URLFor(ctx context.Context, urlPath string, options map[string]interface{}) (string, error) {
storagePath, err := r.StorageDriver.URLFor(ctx, urlPath, options)
if err != nil {
return "", err
}
u, err := url.Parse(storagePath)
if err != nil {
return "", err
}
if r.overrideScheme != "" {
u.Scheme = r.overrideScheme
}
if r.overrideHost != "" {
u.Host = r.overrideHost
}
if r.trimPathPrefix != "" {
u.Path = strings.TrimPrefix(u.Path, r.trimPathPrefix)
}
return u.String(), nil
}