Adding upstream version 9.0.0.

Signed-off-by: Daniel Baumann <daniel@debian.org>

2 files changed, 289 insertions, 0 deletions

diff --git a/modules/packages/pub/metadata.go b/modules/packages/pub/metadata.go
new file mode 100644
index 0000000..afb464e
--- /dev/null
+++ b/modules/packages/pub/metadata.go
@@ -0,0 +1,153 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package pub
+
+import (
+	"archive/tar"
+	"compress/gzip"
+	"io"
+	"regexp"
+	"strings"
+
+	"code.gitea.io/gitea/modules/util"
+	"code.gitea.io/gitea/modules/validation"
+
+	"github.com/hashicorp/go-version"
+	"gopkg.in/yaml.v3"
+)
+
+var (
+	ErrMissingPubspecFile  = util.NewInvalidArgumentErrorf("Pubspec file is missing")
+	ErrPubspecFileTooLarge = util.NewInvalidArgumentErrorf("Pubspec file is too large")
+	ErrInvalidName         = util.NewInvalidArgumentErrorf("package name is invalid")
+	ErrInvalidVersion      = util.NewInvalidArgumentErrorf("package version is invalid")
+)
+
+var namePattern = regexp.MustCompile(`\A[a-zA-Z_][a-zA-Z0-9_]*\z`)
+
+// https://github.com/dart-lang/pub-dev/blob/4d582302a8d10152a5cd6129f65bf4f4dbca239d/pkg/pub_package_reader/lib/pub_package_reader.dart#L143
+const maxPubspecFileSize = 128 * 1024
+
+// Package represents a Pub package
+type Package struct {
+	Name     string
+	Version  string
+	Metadata *Metadata
+}
+
+// Metadata represents the metadata of a Pub package
+type Metadata struct {
+	Description      string `json:"description,omitempty"`
+	ProjectURL       string `json:"project_url,omitempty"`
+	RepositoryURL    string `json:"repository_url,omitempty"`
+	DocumentationURL string `json:"documentation_url,omitempty"`
+	Readme           string `json:"readme,omitempty"`
+	Pubspec          any    `json:"pubspec"`
+}
+
+type pubspecPackage struct {
+	Name          string `yaml:"name"`
+	Version       string `yaml:"version"`
+	Description   string `yaml:"description"`
+	Homepage      string `yaml:"homepage"`
+	Repository    string `yaml:"repository"`
+	Documentation string `yaml:"documentation"`
+}
+
+// ParsePackage parses the Pub package file
+func ParsePackage(r io.Reader) (*Package, error) {
+	gzr, err := gzip.NewReader(r)
+	if err != nil {
+		return nil, err
+	}
+	defer gzr.Close()
+
+	var p *Package
+	var readme string
+
+	tr := tar.NewReader(gzr)
+	for {
+		hd, err := tr.Next()
+		if err == io.EOF {
+			break
+		}
+		if err != nil {
+			return nil, err
+		}
+
+		if hd.Typeflag != tar.TypeReg {
+			continue
+		}
+
+		if hd.Name == "pubspec.yaml" {
+			if hd.Size > maxPubspecFileSize {
+				return nil, ErrPubspecFileTooLarge
+			}
+			p, err = ParsePubspecMetadata(tr)
+			if err != nil {
+				return nil, err
+			}
+		} else if strings.ToLower(hd.Name) == "readme.md" {
+			data, err := io.ReadAll(tr)
+			if err != nil {
+				return nil, err
+			}
+			readme = string(data)
+		}
+	}
+
+	if p == nil {
+		return nil, ErrMissingPubspecFile
+	}
+
+	p.Metadata.Readme = readme
+
+	return p, nil
+}
+
+// ParsePubspecMetadata parses a Pubspec file to retrieve the metadata of a Pub package
+func ParsePubspecMetadata(r io.Reader) (*Package, error) {
+	buf, err := io.ReadAll(io.LimitReader(r, maxPubspecFileSize))
+	if err != nil {
+		return nil, err
+	}
+
+	var p pubspecPackage
+	if err := yaml.Unmarshal(buf, &p); err != nil {
+		return nil, err
+	}
+
+	if !namePattern.MatchString(p.Name) {
+		return nil, ErrInvalidName
+	}
+
+	v, err := version.NewSemver(p.Version)
+	if err != nil {
+		return nil, ErrInvalidVersion
+	}
+
+	if !validation.IsValidURL(p.Homepage) {
+		p.Homepage = ""
+	}
+	if !validation.IsValidURL(p.Repository) {
+		p.Repository = ""
+	}
+
+	var pubspec any
+	if err := yaml.Unmarshal(buf, &pubspec); err != nil {
+		return nil, err
+	}
+
+	return &Package{
+		Name:    p.Name,
+		Version: v.String(),
+		Metadata: &Metadata{
+			Description:      p.Description,
+			ProjectURL:       p.Homepage,
+			RepositoryURL:    p.Repository,
+			DocumentationURL: p.Documentation,
+			Pubspec:          pubspec,
+		},
+	}, nil
+}
diff --git a/modules/packages/pub/metadata_test.go b/modules/packages/pub/metadata_test.go
new file mode 100644
index 0000000..5ed083b
--- /dev/null
+++ b/modules/packages/pub/metadata_test.go
@@ -0,0 +1,136 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package pub
+
+import (
+	"archive/tar"
+	"bytes"
+	"compress/gzip"
+	"io"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+const (
+	packageName      = "gitea"
+	packageVersion   = "1.0.1"
+	description      = "Package Description"
+	projectURL       = "https://gitea.com"
+	repositoryURL    = "https://gitea.com/gitea/gitea"
+	documentationURL = "https://docs.gitea.com"
+)
+
+const pubspecContent = `name: ` + packageName + `
+version: ` + packageVersion + `
+description: ` + description + `
+homepage: ` + projectURL + `
+repository: ` + repositoryURL + `
+documentation: ` + documentationURL + `
+
+environment:
+  sdk: '>=2.16.0 <3.0.0'
+
+dependencies:
+  flutter:
+    sdk: flutter
+  path: '>=1.8.0 <3.0.0'
+
+dev_dependencies:
+  http: '>=0.13.0'`
+
+func TestParsePackage(t *testing.T) {
+	createArchive := func(files map[string][]byte) io.Reader {
+		var buf bytes.Buffer
+		zw := gzip.NewWriter(&buf)
+		tw := tar.NewWriter(zw)
+		for filename, content := range files {
+			hdr := &tar.Header{
+				Name: filename,
+				Mode: 0o600,
+				Size: int64(len(content)),
+			}
+			tw.WriteHeader(hdr)
+			tw.Write(content)
+		}
+		tw.Close()
+		zw.Close()
+		return &buf
+	}
+
+	t.Run("MissingPubspecFile", func(t *testing.T) {
+		data := createArchive(map[string][]byte{"dummy.txt": {}})
+
+		pp, err := ParsePackage(data)
+		assert.Nil(t, pp)
+		require.ErrorIs(t, err, ErrMissingPubspecFile)
+	})
+
+	t.Run("PubspecFileTooLarge", func(t *testing.T) {
+		data := createArchive(map[string][]byte{"pubspec.yaml": make([]byte, 200*1024)})
+
+		pp, err := ParsePackage(data)
+		assert.Nil(t, pp)
+		require.ErrorIs(t, err, ErrPubspecFileTooLarge)
+	})
+
+	t.Run("InvalidPubspecFile", func(t *testing.T) {
+		data := createArchive(map[string][]byte{"pubspec.yaml": {}})
+
+		pp, err := ParsePackage(data)
+		assert.Nil(t, pp)
+		require.Error(t, err)
+	})
+
+	t.Run("Valid", func(t *testing.T) {
+		data := createArchive(map[string][]byte{"pubspec.yaml": []byte(pubspecContent)})
+
+		pp, err := ParsePackage(data)
+		require.NoError(t, err)
+		assert.NotNil(t, pp)
+		assert.Empty(t, pp.Metadata.Readme)
+	})
+
+	t.Run("ValidWithReadme", func(t *testing.T) {
+		data := createArchive(map[string][]byte{"pubspec.yaml": []byte(pubspecContent), "README.md": []byte("readme")})
+
+		pp, err := ParsePackage(data)
+		require.NoError(t, err)
+		assert.NotNil(t, pp)
+		assert.Equal(t, "readme", pp.Metadata.Readme)
+	})
+}
+
+func TestParsePubspecMetadata(t *testing.T) {
+	t.Run("InvalidName", func(t *testing.T) {
+		for _, name := range []string{"123abc", "ab-cd"} {
+			pp, err := ParsePubspecMetadata(strings.NewReader(`name: ` + name))
+			assert.Nil(t, pp)
+			require.ErrorIs(t, err, ErrInvalidName)
+		}
+	})
+
+	t.Run("InvalidVersion", func(t *testing.T) {
+		pp, err := ParsePubspecMetadata(strings.NewReader(`name: dummy
+version: invalid`))
+		assert.Nil(t, pp)
+		require.ErrorIs(t, err, ErrInvalidVersion)
+	})
+
+	t.Run("Valid", func(t *testing.T) {
+		pp, err := ParsePubspecMetadata(strings.NewReader(pubspecContent))
+		require.NoError(t, err)
+		assert.NotNil(t, pp)
+
+		assert.Equal(t, packageName, pp.Name)
+		assert.Equal(t, packageVersion, pp.Version)
+		assert.Equal(t, description, pp.Metadata.Description)
+		assert.Equal(t, projectURL, pp.Metadata.ProjectURL)
+		assert.Equal(t, repositoryURL, pp.Metadata.RepositoryURL)
+		assert.Equal(t, documentationURL, pp.Metadata.DocumentationURL)
+		assert.NotNil(t, pp.Metadata.Pubspec)
+	})
+}