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uri.go
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uri.go
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// Copyright (C) 2023-2024 Holger de Carne and contributors
//
// This software may be modified and distributed under the terms
// of the MIT license. See the LICENSE file for details.
package certstore
import (
"fmt"
"net/url"
"path/filepath"
"strconv"
"time"
"github.com/hdecarne-github/go-certstore/storage"
)
func NewStoreFromURI(uri string, basePath string) (*Registry, error) {
parsedURI, err := url.Parse(uri)
if err != nil {
return nil, fmt.Errorf("failed to parse URI '%s' (cause: %w)", uri, err)
}
context := &decodeStoreURIContext{uri: parsedURI}
err = context.decodeStoreURI()
if err != nil {
return nil, err
}
backend, err := context.backendFactory(context, basePath)
if err != nil {
return nil, err
}
registry, err := NewStore(backend, context.cacheTTL)
if err != nil {
return nil, err
}
return registry, nil
}
type decodeStoreURIContext struct {
uri *url.URL
backendFactory func(context *decodeStoreURIContext, basePath string) (storage.Backend, error)
cacheTTL time.Duration
versionLimit storage.VersionLimit
}
func (context *decodeStoreURIContext) decodeStoreURI() error {
err := context.decodeStoreURIScheme()
if err != nil {
return err
}
err = context.decodeStoreURIParameters()
if err != nil {
return err
}
return nil
}
func (context *decodeStoreURIContext) decodeStoreURIScheme() error {
switch context.uri.Scheme {
case "memory":
context.backendFactory = newMemoryStorageFromURI
case "fs":
context.backendFactory = newFSStorageFromURI
default:
return fmt.Errorf("unrecognized backend scheme '%s'", context.uri.Scheme)
}
return nil
}
func newMemoryStorageFromURI(context *decodeStoreURIContext, basePath string) (storage.Backend, error) {
return storage.NewMemoryStorage(context.versionLimit), nil
}
func newFSStorageFromURI(context *decodeStoreURIContext, basePath string) (storage.Backend, error) {
path := filepath.Join(basePath, context.uri.Path)
return storage.NewFSStorage(path, context.versionLimit)
}
func (context *decodeStoreURIContext) decodeStoreURIParameters() error {
parameters, err := url.ParseQuery(context.uri.RawQuery)
if err != nil {
return fmt.Errorf("failed to parse URI parameters '%s' (cause: %w)", context.uri.RawQuery, err)
}
for key, values := range parameters {
value, err := context.decodeStoreURIParameterValue(key, values)
if err != nil {
return err
}
switch key {
case "cache_ttl":
err = context.decodeStoreURICacheTTL(value)
case "version_limit":
err = context.decodeStoreURIVersionLimit(value)
default:
err = fmt.Errorf("unrecognized URI parameter '%s'", key)
}
if err != nil {
return err
}
}
return nil
}
func (context *decodeStoreURIContext) decodeStoreURIParameterValue(key string, values []string) (string, error) {
valueCount := len(values)
if valueCount > 1 {
return "", fmt.Errorf("multiple values set for parameter '%s'", key)
}
return values[0], nil
}
func (context *decodeStoreURIContext) decodeStoreURIVersionLimit(value string) error {
parsedValue, err := strconv.ParseUint(value, 10, 64)
if err != nil {
return fmt.Errorf("failed to parse version limit '%s' (cause: %w)", value, err)
}
context.versionLimit = storage.VersionLimit(parsedValue)
return nil
}
func (context *decodeStoreURIContext) decodeStoreURICacheTTL(value string) error {
parsedCacheTTL, err := time.ParseDuration(value)
if err != nil {
return fmt.Errorf("failed to parse cache TTL '%s' (cause: %w)", value, err)
}
context.cacheTTL = parsedCacheTTL
return nil
}