/
collect.go
84 lines (70 loc) · 2.21 KB
/
collect.go
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// Copyright 2022 Hardfin, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package npmmod
import (
"fmt"
"github.com/hardfinhq/npm-mod/pkg/ordered"
)
// NOTE: Ensure that
// * `CollectPackages{}.Visit` satisfies `VisitorFunc`.
var (
_ VisitorFunc = (&CollectPackages{}).Visit
)
// CollectPackages produces a vis]]]itor function that collects informationa about
// all packages in a `package-lock.json` (in particular, about the `resolved`
// URLs).
type CollectPackages struct {
ByNodeModulesPath map[string]RegistryPackage
ByURL map[string]RegistryPackage
ParentKey string
}
// Visit is a visitor function that **tracks** a package `resolved` URL.
func (cp *CollectPackages) Visit(deps *ordered.OrderedMap, k string, v any) error {
name := k
if cp.ParentKey == "packages" && name == "" {
return nil
}
packageMap, ok := v.(*ordered.OrderedMap)
if !ok {
return fmt.Errorf("package %q does not point at a map", name)
}
resolvedAny := packageMap.Get("resolved")
resolved, ok := resolvedAny.(string)
if !ok {
return fmt.Errorf(`package %q "resolved" is not a string`, name)
}
integrityAny := packageMap.Get("integrity")
integrity, ok := integrityAny.(string)
if !ok {
return fmt.Errorf(`package %q "integrity" is not a string`, name)
}
algorithm, hash, err := splitIntegrity(integrity)
if err != nil {
return err
}
rp := RegistryPackage{
URL: resolved,
Algorithm: algorithm,
Hash: hash,
}
existing, ok := cp.ByURL[rp.URL]
if ok && !rp.Equal(existing) {
return fmt.Errorf("conflict with existing package; existing: %#v, to add: %#v", existing, rp)
}
cp.ByURL[rp.URL] = rp
if cp.ParentKey == "packages" {
cp.ByNodeModulesPath[name] = rp
}
return nil
}