Add support for Pub packages (#20560)

* Added support for Pub packages.

* Update docs/content/doc/packages/overview.en-us.md

Co-authored-by: Gergely Nagy <algernon@users.noreply.github.com>

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: Gergely Nagy <algernon@users.noreply.github.com>
Co-authored-by: Lauris BH <lauris@nix.lv>

22 files changed, 908 insertions, 4 deletions

diff --git a/docs/content/doc/packages/overview.en-us.md b/docs/content/doc/packages/overview.en-us.md
index 81575b9ade..5e03b71017 100644
--- a/docs/content/doc/packages/overview.en-us.md
+++ b/docs/content/doc/packages/overview.en-us.md
@@ -34,6 +34,7 @@ The following package managers are currently supported:
 | [Maven]({{< relref "doc/packages/maven.en-us.md" >}}) | Java | `mvn`, `gradle` |
 | [npm]({{< relref "doc/packages/npm.en-us.md" >}}) | JavaScript | `npm`, `yarn` |
 | [NuGet]({{< relref "doc/packages/nuget.en-us.md" >}}) | .NET | `nuget` |
+| [Pub]({{< relref "doc/packages/pub.en-us.md" >}}) | Dart | `dart`, `flutter` |
 | [PyPI]({{< relref "doc/packages/pypi.en-us.md" >}}) | Python | `pip`, `twine` |
 | [RubyGems]({{< relref "doc/packages/rubygems.en-us.md" >}}) | Ruby | `gem`, `Bundler` |
 
diff --git a/docs/content/doc/packages/pub.en-us.md b/docs/content/doc/packages/pub.en-us.md
new file mode 100644
index 0000000000..4d37662208
--- /dev/null
+++ b/docs/content/doc/packages/pub.en-us.md
@@ -0,0 +1,83 @@
+---
+date: "2022-07-31T00:00:00+00:00"
+title: "Pub Packages Repository"
+slug: "packages/pub"
+draft: false
+toc: false
+menu:
+  sidebar:
+    parent: "packages"
+    name: "Pub"
+    weight: 90
+    identifier: "pub"
+---
+
+# Pub Packages Repository
+
+Publish [Pub](https://dart.dev/guides/packages) packages for your user or organization.
+
+**Table of Contents**
+
+{{< toc >}}
+
+## Requirements
+
+To work with the Pub package registry, you need to use the tools [dart](https://dart.dev/tools/dart-tool) and/or [flutter](https://docs.flutter.dev/reference/flutter-cli).
+
+The following examples use dart.
+
+## Configuring the package registry
+
+To register the package registry and provide credentials, execute:
+
+```shell
+dart pub token add https://gitea.example.com/api/packages/{owner}/pub
+```
+
+| Placeholder  | Description |
+| ------------ | ----------- |
+| `owner`      | The owner of the package. |
+
+You need to provide your [personal access token]({{< relref "doc/developers/api-usage.en-us.md#authentication" >}}).
+
+## Publish a package
+
+To publish a package, edit the `pubspec.yaml` and add the following line:
+
+```yaml
+publish_to: https://gitea.example.com/api/packages/{owner}/pub
+```
+
+| Placeholder  | Description |
+| ------------ | ----------- |
+| `owner`      | The owner of the package. |
+
+Now you can publish the package by running the following command:
+
+```shell
+dart pub publish
+```
+
+You cannot publish a package if a package of the same name and version already exists. You must delete the existing package first.
+
+## Install a package
+
+To install a Pub package from the package registry, execute the following command:
+
+```shell
+dart pub add {package_name} --hosted-url=https://gitea.example.com/api/packages/{owner}/pub/
+```
+
+| Parameter         | Description |
+| ----------------- | ----------- |
+| `owner`           | The owner of the package. |
+| `package_name`    | The package name. |
+
+For example:
+
+```shell
+# use latest version
+dart pub add mypackage --hosted-url=https://gitea.example.com/api/packages/testuser/pub/
+# specify version
+dart pub add mypackage:1.0.8 --hosted-url=https://gitea.example.com/api/packages/testuser/pub/
+```
diff --git a/docs/content/doc/packages/pypi.en-us.md b/docs/content/doc/packages/pypi.en-us.md
index af17fe8310..588df71d60 100644
--- a/docs/content/doc/packages/pypi.en-us.md
+++ b/docs/content/doc/packages/pypi.en-us.md
@@ -8,7 +8,7 @@ menu:
   sidebar:
     parent: "packages"
     name: "PyPI"
-    weight: 90
+    weight: 100
     identifier: "pypi"
 ---
 
diff --git a/docs/content/doc/packages/rubygems.en-us.md b/docs/content/doc/packages/rubygems.en-us.md
index dd7ac9ee7e..d4ae30bbce 100644
--- a/docs/content/doc/packages/rubygems.en-us.md
+++ b/docs/content/doc/packages/rubygems.en-us.md
@@ -8,7 +8,7 @@ menu:
   sidebar:
     parent: "packages"
     name: "RubyGems"
-    weight: 100
+    weight: 110
     identifier: "rubygems"
 ---
 
diff --git a/integrations/api_packages_pub_test.go b/integrations/api_packages_pub_test.go
new file mode 100644
index 0000000000..d64f88def7
--- /dev/null
+++ b/integrations/api_packages_pub_test.go
@@ -0,0 +1,179 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package integrations
+
+import (
+	"archive/tar"
+	"bytes"
+	"compress/gzip"
+	"fmt"
+	"io"
+	"mime/multipart"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+	"time"
+
+	"code.gitea.io/gitea/models/db"
+	"code.gitea.io/gitea/models/packages"
+	"code.gitea.io/gitea/models/unittest"
+	user_model "code.gitea.io/gitea/models/user"
+	pub_module "code.gitea.io/gitea/modules/packages/pub"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestPackagePub(t *testing.T) {
+	defer prepareTestEnv(t)()
+	user := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 2}).(*user_model.User)
+
+	token := "Bearer " + getUserToken(t, user.Name)
+
+	packageName := "test_package"
+	packageVersion := "1.0.1"
+	packageDescription := "Test Description"
+
+	filename := fmt.Sprintf("%s.tar.gz", packageVersion)
+
+	pubspecContent := `name: ` + packageName + `
+version: ` + packageVersion + `
+description: ` + packageDescription
+
+	var buf bytes.Buffer
+	zw := gzip.NewWriter(&buf)
+	archive := tar.NewWriter(zw)
+	archive.WriteHeader(&tar.Header{
+		Name: "pubspec.yaml",
+		Mode: 0o600,
+		Size: int64(len(pubspecContent)),
+	})
+	archive.Write([]byte(pubspecContent))
+	archive.Close()
+	zw.Close()
+	content := buf.Bytes()
+
+	root := fmt.Sprintf("/api/packages/%s/pub", user.Name)
+
+	t.Run("Upload", func(t *testing.T) {
+		defer PrintCurrentTest(t)()
+
+		uploadURL := root + "/api/packages/versions/new"
+
+		req := NewRequest(t, "GET", uploadURL)
+		MakeRequest(t, req, http.StatusUnauthorized)
+
+		req = NewRequest(t, "GET", uploadURL)
+		addTokenAuthHeader(req, token)
+		resp := MakeRequest(t, req, http.StatusOK)
+
+		type UploadRequest struct {
+			URL    string            `json:"url"`
+			Fields map[string]string `json:"fields"`
+		}
+
+		var result UploadRequest
+		DecodeJSON(t, resp, &result)
+
+		assert.Empty(t, result.Fields)
+
+		uploadFile := func(t *testing.T, url string, content []byte, expectedStatus int) *httptest.ResponseRecorder {
+			body := &bytes.Buffer{}
+			writer := multipart.NewWriter(body)
+			part, _ := writer.CreateFormFile("file", "dummy.tar.gz")
+			_, _ = io.Copy(part, bytes.NewReader(content))
+
+			_ = writer.Close()
+
+			req := NewRequestWithBody(t, "POST", url, body)
+			req.Header.Add("Content-Type", writer.FormDataContentType())
+			addTokenAuthHeader(req, token)
+			return MakeRequest(t, req, expectedStatus)
+		}
+
+		resp = uploadFile(t, result.URL, content, http.StatusNoContent)
+
+		req = NewRequest(t, "GET", resp.Header().Get("Location"))
+		addTokenAuthHeader(req, token)
+		MakeRequest(t, req, http.StatusOK)
+
+		pvs, err := packages.GetVersionsByPackageType(db.DefaultContext, user.ID, packages.TypePub)
+		assert.NoError(t, err)
+		assert.Len(t, pvs, 1)
+
+		pd, err := packages.GetPackageDescriptor(db.DefaultContext, pvs[0])
+		assert.NoError(t, err)
+		assert.NotNil(t, pd.SemVer)
+		assert.IsType(t, &pub_module.Metadata{}, pd.Metadata)
+		assert.Equal(t, packageName, pd.Package.Name)
+		assert.Equal(t, packageVersion, pd.Version.Version)
+
+		pfs, err := packages.GetFilesByVersionID(db.DefaultContext, pvs[0].ID)
+		assert.NoError(t, err)
+		assert.Len(t, pfs, 1)
+		assert.Equal(t, filename, pfs[0].Name)
+		assert.True(t, pfs[0].IsLead)
+
+		pb, err := packages.GetBlobByID(db.DefaultContext, pfs[0].BlobID)
+		assert.NoError(t, err)
+		assert.Equal(t, int64(len(content)), pb.Size)
+
+		resp = uploadFile(t, result.URL, content, http.StatusBadRequest)
+	})
+
+	t.Run("Download", func(t *testing.T) {
+		defer PrintCurrentTest(t)()
+
+		req := NewRequest(t, "GET", fmt.Sprintf("%s/api/packages/%s/%s", root, packageName, packageVersion))
+		resp := MakeRequest(t, req, http.StatusOK)
+
+		type VersionMetadata struct {
+			Version    string      `json:"version"`
+			ArchiveURL string      `json:"archive_url"`
+			Published  time.Time   `json:"published"`
+			Pubspec    interface{} `json:"pubspec,omitempty"`
+		}
+
+		var result VersionMetadata
+		DecodeJSON(t, resp, &result)
+
+		assert.Equal(t, packageVersion, result.Version)
+		assert.NotNil(t, result.Pubspec)
+
+		req = NewRequest(t, "GET", result.ArchiveURL)
+		resp = MakeRequest(t, req, http.StatusOK)
+
+		assert.Equal(t, content, resp.Body.Bytes())
+	})
+
+	t.Run("EnumeratePackageVersions", func(t *testing.T) {
+		defer PrintCurrentTest(t)()
+
+		req := NewRequest(t, "GET", fmt.Sprintf("%s/api/packages/%s", root, packageName))
+		resp := MakeRequest(t, req, http.StatusOK)
+
+		type VersionMetadata struct {
+			Version    string      `json:"version"`
+			ArchiveURL string      `json:"archive_url"`
+			Published  time.Time   `json:"published"`
+			Pubspec    interface{} `json:"pubspec,omitempty"`
+		}
+
+		type PackageVersions struct {
+			Name     string             `json:"name"`
+			Latest   *VersionMetadata   `json:"latest"`
+			Versions []*VersionMetadata `json:"versions"`
+		}
+
+		var result PackageVersions
+		DecodeJSON(t, resp, &result)
+
+		assert.Equal(t, packageName, result.Name)
+		assert.NotNil(t, result.Latest)
+		assert.Len(t, result.Versions, 1)
+		assert.Equal(t, result.Latest.Version, result.Versions[0].Version)
+		assert.Equal(t, packageVersion, result.Latest.Version)
+		assert.NotNil(t, result.Latest.Pubspec)
+	})
+}
diff --git a/models/packages/descriptor.go b/models/packages/descriptor.go
index 31819ccca1..dc753421d0 100644
--- a/models/packages/descriptor.go
+++ b/models/packages/descriptor.go
@@ -19,6 +19,7 @@ import (
 	"code.gitea.io/gitea/modules/packages/maven"
 	"code.gitea.io/gitea/modules/packages/npm"
 	"code.gitea.io/gitea/modules/packages/nuget"
+	"code.gitea.io/gitea/modules/packages/pub"
 	"code.gitea.io/gitea/modules/packages/pypi"
 	"code.gitea.io/gitea/modules/packages/rubygems"
 
@@ -143,6 +144,8 @@ func GetPackageDescriptor(ctx context.Context, pv *PackageVersion) (*PackageDesc
 		metadata = &npm.Metadata{}
 	case TypeMaven:
 		metadata = &maven.Metadata{}
+	case TypePub:
+		metadata = &pub.Metadata{}
 	case TypePyPI:
 		metadata = &pypi.Metadata{}
 	case TypeRubyGems:
diff --git a/models/packages/package.go b/models/packages/package.go
index 97cfbc6cad..39b1c83cfa 100644
--- a/models/packages/package.go
+++ b/models/packages/package.go
@@ -39,6 +39,7 @@ const (
 	TypeMaven     Type = "maven"
 	TypeNpm       Type = "npm"
 	TypeNuGet     Type = "nuget"
+	TypePub       Type = "pub"
 	TypePyPI      Type = "pypi"
 	TypeRubyGems  Type = "rubygems"
 )
@@ -62,6 +63,8 @@ func (pt Type) Name() string {
 		return "npm"
 	case TypeNuGet:
 		return "NuGet"
+	case TypePub:
+		return "Pub"
 	case TypePyPI:
 		return "PyPI"
 	case TypeRubyGems:
@@ -89,6 +92,8 @@ func (pt Type) SVGName() string {
 		return "gitea-npm"
 	case TypeNuGet:
 		return "gitea-nuget"
+	case TypePub:
+		return "gitea-pub"
 	case TypePyPI:
 		return "gitea-python"
 	case TypeRubyGems:
diff --git a/modules/packages/pub/metadata.go b/modules/packages/pub/metadata.go
new file mode 100644
index 0000000000..1fc4908b91
--- /dev/null
+++ b/modules/packages/pub/metadata.go
@@ -0,0 +1,154 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package pub
+
+import (
+	"archive/tar"
+	"compress/gzip"
+	"errors"
+	"io"
+	"regexp"
+	"strings"
+
+	"code.gitea.io/gitea/modules/validation"
+
+	"github.com/hashicorp/go-version"
+	"gopkg.in/yaml.v2"
+)
+
+var (
+	ErrMissingPubspecFile  = errors.New("Pubspec file is missing")
+	ErrPubspecFileTooLarge = errors.New("Pubspec file is too large")
+	ErrInvalidName         = errors.New("Package name is invalid")
+	ErrInvalidVersion      = errors.New("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          interface{} `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 interface{}
+	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 0000000000..e43ed64fc6
--- /dev/null
+++ b/modules/packages/pub/metadata_test.go
@@ -0,0 +1,136 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package pub
+
+import (
+	"archive/tar"
+	"bytes"
+	"compress/gzip"
+	"io"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+const (
+	packageName      = "gitea"
+	packageVersion   = "1.0.1"
+	description      = "Package Description"
+	projectURL       = "https://gitea.io"
+	repositoryURL    = "https://gitea.io/gitea/gitea"
+	documentationURL = "https://docs.gitea.io"
+)
+
+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)
+		assert.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)
+		assert.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)
+		assert.Error(t, err)
+	})
+
+	t.Run("Valid", func(t *testing.T) {
+		data := createArchive(map[string][]byte{"pubspec.yaml": []byte(pubspecContent)})
+
+		pp, err := ParsePackage(data)
+		assert.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)
+		assert.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)
+			assert.ErrorIs(t, err, ErrInvalidName)
+		}
+	})
+
+	t.Run("InvalidVersion", func(t *testing.T) {
+		pp, err := ParsePubspecMetadata(strings.NewReader(`name: dummy
+version: invalid`))
+		assert.Nil(t, pp)
+		assert.ErrorIs(t, err, ErrInvalidVersion)
+	})
+
+	t.Run("Valid", func(t *testing.T) {
+		pp, err := ParsePubspecMetadata(strings.NewReader(pubspecContent))
+		assert.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)
+	})
+}
diff --git a/options/locale/locale_en-US.ini b/options/locale/locale_en-US.ini
index b6f00727ea..56d6d41916 100644
--- a/options/locale/locale_en-US.ini
+++ b/options/locale/locale_en-US.ini
@@ -3111,6 +3111,10 @@ npm.dependencies.development = Development Dependencies
 npm.dependencies.peer = Peer Dependencies
 npm.dependencies.optional = Optional Dependencies
 npm.details.tag = Tag
+pub.install = To install the package using Dart, run the following command:
+pub.documentation = For more information on the Pub registry, see <a target="_blank" rel="noopener noreferrer" href="https://docs.gitea.io/en-us/packages/pub/">the documentation</a>.
+pub.details.repository_site = Repository Site
+pub.details.documentation_site = Documentation Site
 pypi.requires = Requires Python
 pypi.install = To install the package using pip, run the following command:
 pypi.documentation = For more information on the PyPI registry, see <a target="_blank" rel="noopener noreferrer" href="https://docs.gitea.io/en-us/packages/pypi/">the documentation</a>.
diff --git a/public/img/svg/gitea-pub.svg b/public/img/svg/gitea-pub.svg
new file mode 100644
index 0000000000..4a750c7082
--- /dev/null
+++ b/public/img/svg/gitea-pub.svg
@@ -0,0 +1 @@
+<svg viewBox="0 0 502.87 502.87" class="svg gitea-pub" width="16" height="16" aria-hidden="true"><defs><radialGradient id="gitea-pub__a" cx="251.42" cy="631.97" r="251.4" gradientTransform="translate(0 -380.56)" gradientUnits="userSpaceOnUse"><stop stop-color="#fff" stop-opacity=".1" offset="0"/><stop stop-color="#fff" stop-opacity="0" offset="1"/></radialGradient><style>.gitea-pub__cls-1{fill:#01579b}.gitea-pub__cls-2{fill:#40c4ff}.gitea-pub__cls-4{fill:#fff;opacity:.2;isolation:isolate}</style></defs><path class="gitea-pub__cls-1" d="m102.56 400.31-86-86C6.32 303.82 0 289 0 274.58c0-6.69 3.77-17.16 6.62-23.15L86 86Z"/><path class="gitea-pub__cls-2" d="m397 102.56-86-86C303.49 9 287.85 0 274.61 0c-11.38 0-22.55 2.29-29.76 6.62L86.07 86ZM205.11 502.87h208.44v-89.32l-155.5-49.65-142.26 49.65z"/><path d="M86 354c0 26.54 3.33 33.05 16.53 46.32l13.23 13.24h297.79L268 248.14 86 86Z" style="fill:#29b6f6"/><path class="gitea-pub__cls-1" d="M350.7 86H86l327.55 327.51h89.32V208.4L397 102.52C382.12 87.62 368.92 86 350.7 86Z"/><path class="gitea-pub__cls-4" d="M105.88 403.6c-13.23-13.27-16.52-26.36-16.52-49.6V89.32L86.07 86v268c0 23.25 0 29.69 19.81 49.61l9.91 9.91Z"/><path style="fill:#263238;opacity:.2;isolation:isolate" d="M499.58 205.11v205.11h-89.32l3.29 3.33h89.32V208.4z"/><path class="gitea-pub__cls-4" d="M397 102.56C380.61 86.14 367.19 86 347.41 86H86.07l3.29 3.29h258.05c9.87 0 34.79-1.66 49.61 13.24Z"/><path d="M499.58 205.11 397 102.56l-86-86C303.49 9 287.85 0 274.61 0c-11.38 0-22.55 2.29-29.76 6.62L86.07 86 6.65 251.43C3.81 257.46 0 267.92 0 274.58c0 14.45 6.36 29.2 16.52 39.7L95.83 393a92.42 92.42 0 0 0 6.73 7.32l3.29 3.29 9.9 9.91 86 86 3.29 3.29h208.4v-89.3h89.32V208.4Z" style="fill:url(#gitea-pub__a);opacity:.2;isolation:isolate"/></svg>
\ No newline at end of file
diff --git a/routers/api/packages/api.go b/routers/api/packages/api.go
index bb9a42e33d..4b274860dc 100644
--- a/routers/api/packages/api.go
+++ b/routers/api/packages/api.go
@@ -21,6 +21,7 @@ import (
 	"code.gitea.io/gitea/routers/api/packages/maven"
 	"code.gitea.io/gitea/routers/api/packages/npm"
 	"code.gitea.io/gitea/routers/api/packages/nuget"
+	"code.gitea.io/gitea/routers/api/packages/pub"
 	"code.gitea.io/gitea/routers/api/packages/pypi"
 	"code.gitea.io/gitea/routers/api/packages/rubygems"
 	"code.gitea.io/gitea/services/auth"
@@ -216,6 +217,20 @@ func Routes() *web.Route {
 				}, reqPackageAccess(perm.AccessModeWrite))
 			})
 		})
+		r.Group("/pub", func() {
+			r.Group("/api/packages", func() {
+				r.Group("/versions/new", func() {
+					r.Get("", pub.RequestUpload)
+					r.Post("/upload", pub.UploadPackageFile)
+					r.Get("/finalize/{id}/{version}", pub.FinalizePackage)
+				}, reqPackageAccess(perm.AccessModeWrite))
+				r.Group("/{id}", func() {
+					r.Get("", pub.EnumeratePackageVersions)
+					r.Get("/files/{version}", pub.DownloadPackageFile)
+					r.Get("/{version}", pub.PackageVersionMetadata)
+				})
+			})
+		})
 		r.Group("/pypi", func() {
 			r.Post("/", reqPackageAccess(perm.AccessModeWrite), pypi.UploadPackageFile)
 			r.Get("/files/{id}/{version}/{filename}", pypi.DownloadPackageFile)
diff --git a/routers/api/packages/nuget/nuget.go b/routers/api/packages/nuget/nuget.go
index 4d630708b9..81ea28bcad 100644
--- a/routers/api/packages/nuget/nuget.go
+++ b/routers/api/packages/nuget/nuget.go
@@ -102,7 +102,7 @@ func RegistrationLeaf(ctx *context.Context) {
 	packageName := ctx.Params("id")
 	packageVersion := strings.TrimSuffix(ctx.Params("version"), ".json")
 
-	pv, err := packages_model.GetVersionByNameAndVersion(db.DefaultContext, ctx.Package.Owner.ID, packages_model.TypeNuGet, packageName, packageVersion)
+	pv, err := packages_model.GetVersionByNameAndVersion(ctx, ctx.Package.Owner.ID, packages_model.TypeNuGet, packageName, packageVersion)
 	if err != nil {
 		if err == packages_model.ErrPackageNotExist {
 			apiError(ctx, http.StatusNotFound, err)
diff --git a/routers/api/packages/pub/pub.go b/routers/api/packages/pub/pub.go
new file mode 100644
index 0000000000..470f446238
--- /dev/null
+++ b/routers/api/packages/pub/pub.go
@@ -0,0 +1,275 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package pub
+
+import (
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"sort"
+	"strings"
+	"time"
+
+	packages_model "code.gitea.io/gitea/models/packages"
+	"code.gitea.io/gitea/modules/context"
+	"code.gitea.io/gitea/modules/json"
+	"code.gitea.io/gitea/modules/log"
+	packages_module "code.gitea.io/gitea/modules/packages"
+	pub_module "code.gitea.io/gitea/modules/packages/pub"
+	"code.gitea.io/gitea/modules/setting"
+	"code.gitea.io/gitea/routers/api/packages/helper"
+	packages_service "code.gitea.io/gitea/services/packages"
+)
+
+func jsonResponse(ctx *context.Context, status int, obj interface{}) {
+	resp := ctx.Resp
+	resp.Header().Set("Content-Type", "application/vnd.pub.v2+json")
+	resp.WriteHeader(status)
+	if err := json.NewEncoder(resp).Encode(obj); err != nil {
+		log.Error("JSON encode: %v", err)
+	}
+}
+
+func apiError(ctx *context.Context, status int, obj interface{}) {
+	type Error struct {
+		Code    string `json:"code"`
+		Message string `json:"message"`
+	}
+	type ErrorWrapper struct {
+		Error Error `json:"error"`
+	}
+
+	helper.LogAndProcessError(ctx, status, obj, func(message string) {
+		jsonResponse(ctx, status, ErrorWrapper{
+			Error: Error{
+				Code:    http.StatusText(status),
+				Message: message,
+			},
+		})
+	})
+}
+
+type packageVersions struct {
+	Name     string             `json:"name"`
+	Latest   *versionMetadata   `json:"latest"`
+	Versions []*versionMetadata `json:"versions"`
+}
+
+type versionMetadata struct {
+	Version    string      `json:"version"`
+	ArchiveURL string      `json:"archive_url"`
+	Published  time.Time   `json:"published"`
+	Pubspec    interface{} `json:"pubspec,omitempty"`
+}
+
+func packageDescriptorToMetadata(baseURL string, pd *packages_model.PackageDescriptor) *versionMetadata {
+	return &versionMetadata{
+		Version:    pd.Version.Version,
+		ArchiveURL: fmt.Sprintf("%s/files/%s.tar.gz", baseURL, url.PathEscape(pd.Version.Version)),
+		Published:  time.Unix(int64(pd.Version.CreatedUnix), 0),
+		Pubspec:    pd.Metadata.(*pub_module.Metadata).Pubspec,
+	}
+}
+
+func baseURL(ctx *context.Context) string {
+	return setting.AppURL + "api/packages/" + ctx.Package.Owner.Name + "/pub/api/packages"
+}
+
+// https://github.com/dart-lang/pub/blob/master/doc/repository-spec-v2.md#list-all-versions-of-a-package
+func EnumeratePackageVersions(ctx *context.Context) {
+	packageName := ctx.Params("id")
+
+	pvs, err := packages_model.GetVersionsByPackageName(ctx, ctx.Package.Owner.ID, packages_model.TypePub, packageName)
+	if err != nil {
+		apiError(ctx, http.StatusInternalServerError, err)
+		return
+	}
+	if len(pvs) == 0 {
+		apiError(ctx, http.StatusNotFound, err)
+		return
+	}
+
+	pds, err := packages_model.GetPackageDescriptors(ctx, pvs)
+	if err != nil {
+		apiError(ctx, http.StatusInternalServerError, err)
+		return
+	}
+
+	sort.Slice(pds, func(i, j int) bool {
+		return pds[i].SemVer.LessThan(pds[j].SemVer)
+	})
+
+	baseURL := fmt.Sprintf("%s/%s", baseURL(ctx), url.PathEscape(pds[0].Package.Name))
+
+	versions := make([]*versionMetadata, 0, len(pds))
+	for _, pd := range pds {
+		versions = append(versions, packageDescriptorToMetadata(baseURL, pd))
+	}
+
+	jsonResponse(ctx, http.StatusOK, &packageVersions{
+		Name:     pds[0].Package.Name,
+		Latest:   packageDescriptorToMetadata(baseURL, pds[0]),
+		Versions: versions,
+	})
+}
+
+// https://github.com/dart-lang/pub/blob/master/doc/repository-spec-v2.md#deprecated-inspect-a-specific-version-of-a-package
+func PackageVersionMetadata(ctx *context.Context) {
+	packageName := ctx.Params("id")
+	packageVersion := ctx.Params("version")
+
+	pv, err := packages_model.GetVersionByNameAndVersion(ctx, ctx.Package.Owner.ID, packages_model.TypePub, packageName, packageVersion)
+	if err != nil {
+		if err == packages_model.ErrPackageNotExist {
+			apiError(ctx, http.StatusNotFound, err)
+			return
+		}
+		apiError(ctx, http.StatusInternalServerError, err)
+		return
+	}
+
+	pd, err := packages_model.GetPackageDescriptor(ctx, pv)
+	if err != nil {
+		apiError(ctx, http.StatusInternalServerError, err)
+		return
+	}
+
+	jsonResponse(ctx, http.StatusOK, packageDescriptorToMetadata(
+		fmt.Sprintf("%s/%s", baseURL(ctx), url.PathEscape(pd.Package.Name)),
+		pd,
+	))
+}
+
+// https://github.com/dart-lang/pub/blob/master/doc/repository-spec-v2.md#publishing-packages
+func RequestUpload(ctx *context.Context) {
+	type UploadRequest struct {
+		URL    string            `json:"url"`
+		Fields map[string]string `json:"fields"`
+	}
+
+	jsonResponse(ctx, http.StatusOK, UploadRequest{
+		URL:    baseURL(ctx) + "/versions/new/upload",
+		Fields: make(map[string]string),
+	})
+}
+
+// https://github.com/dart-lang/pub/blob/master/doc/repository-spec-v2.md#publishing-packages
+func UploadPackageFile(ctx *context.Context) {
+	file, _, err := ctx.Req.FormFile("file")
+	if err != nil {
+		apiError(ctx, http.StatusBadRequest, err)
+		return
+	}
+	defer file.Close()
+
+	buf, err := packages_module.CreateHashedBufferFromReader(file, 32*1024*1024)
+	if err != nil {
+		apiError(ctx, http.StatusInternalServerError, err)
+		return
+	}
+	defer buf.Close()
+
+	pck, err := pub_module.ParsePackage(buf)
+	if err != nil {
+		apiError(ctx, http.StatusInternalServerError, err)
+		return
+	}
+
+	if _, err := buf.Seek(0, io.SeekStart); err != nil {
+		apiError(ctx, http.StatusInternalServerError, err)
+		return
+	}
+
+	_, _, err = packages_service.CreatePackageAndAddFile(
+		&packages_service.PackageCreationInfo{
+			PackageInfo: packages_service.PackageInfo{
+				Owner:       ctx.Package.Owner,
+				PackageType: packages_model.TypePub,
+				Name:        pck.Name,
+				Version:     pck.Version,
+			},
+			SemverCompatible: true,
+			Creator:          ctx.Doer,
+			Metadata:         pck.Metadata,
+		},
+		&packages_service.PackageFileCreationInfo{
+			PackageFileInfo: packages_service.PackageFileInfo{
+				Filename: strings.ToLower(pck.Version + ".tar.gz"),
+			},
+			Data:   buf,
+			IsLead: true,
+		},
+	)
+	if err != nil {
+		if err == packages_model.ErrDuplicatePackageVersion {
+			apiError(ctx, http.StatusBadRequest, err)
+			return
+		}
+		apiError(ctx, http.StatusInternalServerError, err)
+		return
+	}
+
+	ctx.Resp.Header().Set("Location", fmt.Sprintf("%s/versions/new/finalize/%s/%s", baseURL(ctx), url.PathEscape(pck.Name), url.PathEscape(pck.Version)))
+	ctx.Status(http.StatusNoContent)
+}
+
+// https://github.com/dart-lang/pub/blob/master/doc/repository-spec-v2.md#publishing-packages
+func FinalizePackage(ctx *context.Context) {
+	packageName := ctx.Params("id")
+	packageVersion := ctx.Params("version")
+
+	_, err := packages_model.GetVersionByNameAndVersion(ctx, ctx.Package.Owner.ID, packages_model.TypePub, packageName, packageVersion)
+	if err != nil {
+		if err == packages_model.ErrPackageNotExist {
+			apiError(ctx, http.StatusNotFound, err)
+			return
+		}
+		apiError(ctx, http.StatusInternalServerError, err)
+		return
+	}
+
+	type Success struct {
+		Message string `json:"message"`
+	}
+	type SuccessWrapper struct {
+		Success Success `json:"success"`
+	}
+
+	jsonResponse(ctx, http.StatusOK, SuccessWrapper{Success{}})
+}
+
+// https://github.com/dart-lang/pub/blob/master/doc/repository-spec-v2.md#deprecated-download-a-specific-version-of-a-package
+func DownloadPackageFile(ctx *context.Context) {
+	packageName := ctx.Params("id")
+	packageVersion := strings.TrimSuffix(ctx.Params("version"), ".tar.gz")
+
+	pv, err := packages_model.GetVersionByNameAndVersion(ctx, ctx.Package.Owner.ID, packages_model.TypePub, packageName, packageVersion)
+	if err != nil {
+		if err == packages_model.ErrPackageNotExist {
+			apiError(ctx, http.StatusNotFound, err)
+			return
+		}
+		apiError(ctx, http.StatusInternalServerError, err)
+		return
+	}
+
+	pd, err := packages_model.GetPackageDescriptor(ctx, pv)
+	if err != nil {
+		apiError(ctx, http.StatusInternalServerError, err)
+		return
+	}
+
+	pf := pd.Files[0].File
+
+	s, _, err := packages_service.GetPackageFileStream(ctx, pf)
+	if err != nil {
+		apiError(ctx, http.StatusInternalServerError, err)
+		return
+	}
+	defer s.Close()
+
+	ctx.ServeStream(s, pf.Name)
+}
diff --git a/routers/api/v1/packages/package.go b/routers/api/v1/packages/package.go
index 5a9c93b3ca..2c02389102 100644
--- a/routers/api/v1/packages/package.go
+++ b/routers/api/v1/packages/package.go
@@ -41,7 +41,7 @@ func ListPackages(ctx *context.APIContext) {
 	//   in: query
 	//   description: package type filter
 	//   type: string
-	//   enum: [composer, conan, container, generic, helm, maven, npm, nuget, pypi, rubygems]
+	//   enum: [composer, conan, container, generic, helm, maven, npm, nuget, pub, pypi, rubygems]
 	// - name: q
 	//   in: query
 	//   description: name filter
diff --git a/templates/admin/packages/list.tmpl b/templates/admin/packages/list.tmpl
index 18e8c5fed8..61721532a4 100644
--- a/templates/admin/packages/list.tmpl
+++ b/templates/admin/packages/list.tmpl
@@ -21,6 +21,7 @@
 						<option value="maven" {{if eq .PackageType "maven"}}selected="selected"{{end}}>Maven</option>
 						<option value="npm" {{if eq .PackageType "npm"}}selected="selected"{{end}}>npm</option>
 						<option value="nuget" {{if eq .PackageType "nuget"}}selected="selected"{{end}}>NuGet</option>
+						<option value="pub" {{if eq .PackageType "pub"}}selected="selected"{{end}}>Pub</option>
 						<option value="pypi" {{if eq .PackageType "pypi"}}selected="selected"{{end}}>PyPi</option>
 						<option value="rubygems" {{if eq .PackageType "rubygems"}}selected="selected"{{end}}>RubyGems</option>
 					</select>
diff --git a/templates/package/content/pub.tmpl b/templates/package/content/pub.tmpl
new file mode 100644
index 0000000000..999e48ce82
--- /dev/null
+++ b/templates/package/content/pub.tmpl
@@ -0,0 +1,19 @@
+{{if eq .PackageDescriptor.Package.Type "pub"}}
+	<h4 class="ui top attached header">{{.locale.Tr "packages.installation"}}</h4>
+	<div class="ui attached segment">
+		<div class="ui form">
+			<div class="field">
+				<label>{{svg "octicon-terminal"}} {{.locale.Tr "packages.pub.install"}}</label>
+				<div class="markup"><pre class="code-block"><code>dart pub add {{.PackageDescriptor.Package.Name}}:{{.PackageDescriptor.Version.Version}} --hosted-url={{AppUrl}}api/packages/{{.PackageDescriptor.Owner.Name}}/pub/</code></pre></div>
+			</div>
+			<div class="field">
+				<label>{{.locale.Tr "packages.pub.documentation" | Safe}}</label>
+			</div>
+		</div>
+	</div>
+	{{if or .PackageDescriptor.Metadata.Description .PackageDescriptor.Metadata.Readme}}
+		<h4 class="ui top attached header">{{.locale.Tr "packages.about"}}</h4>
+		{{if .PackageDescriptor.Metadata.Description}}<div class="ui attached segment">{{.PackageDescriptor.Metadata.Description}}</div>{{end}}
+		{{if .PackageDescriptor.Metadata.Readme}}<div class="ui attached segment">{{RenderMarkdownToHtml .PackageDescriptor.Metadata.Readme}}</div>{{end}}
+	{{end}}
+{{end}}
diff --git a/templates/package/metadata/pub.tmpl b/templates/package/metadata/pub.tmpl
new file mode 100644
index 0000000000..8bd65b49d6
--- /dev/null
+++ b/templates/package/metadata/pub.tmpl
@@ -0,0 +1,5 @@
+{{if eq .PackageDescriptor.Package.Type "pub"}}
+	{{if .PackageDescriptor.Metadata.ProjectURL}}<div class="item">{{svg "octicon-link-external" 16 "mr-3"}} <a href="{{.PackageDescriptor.Metadata.ProjectURL}}" target="_blank" rel="noopener noreferrer me">{{.locale.Tr "packages.details.project_site"}}</a></div>{{end}}
+	{{if .PackageDescriptor.Metadata.RepositoryURL}}<div class="item">{{svg "octicon-link-external" 16 "mr-3"}} <a href="{{.PackageDescriptor.Metadata.RepositoryURL}}" target="_blank" rel="noopener noreferrer me">{{.locale.Tr "packages.pub.details.repository_site"}}</a></div>{{end}}
+	{{if .PackageDescriptor.Metadata.DocumentationURL}}<div class="item">{{svg "octicon-link-external" 16 "mr-3"}} <a href="{{.PackageDescriptor.Metadata.DocumentationURL}}" target="_blank" rel="noopener noreferrer me">{{.locale.Tr "packages.pub.details.documentation_site"}}</a></div>{{end}}
+{{end}}
diff --git a/templates/package/shared/list.tmpl b/templates/package/shared/list.tmpl
index 189b75b59e..020acba9d7 100644
--- a/templates/package/shared/list.tmpl
+++ b/templates/package/shared/list.tmpl
@@ -14,6 +14,7 @@
 				<option value="maven" {{if eq .PackageType "maven"}}selected="selected"{{end}}>Maven</option>
 				<option value="npm" {{if eq .PackageType "npm"}}selected="selected"{{end}}>npm</option>
 				<option value="nuget" {{if eq .PackageType "nuget"}}selected="selected"{{end}}>NuGet</option>
+				<option value="pub" {{if eq .PackageType "pub"}}selected="selected"{{end}}>Pub</option>
 				<option value="pypi" {{if eq .PackageType "pypi"}}selected="selected"{{end}}>PyPi</option>
 				<option value="rubygems" {{if eq .PackageType "rubygems"}}selected="selected"{{end}}>RubyGems</option>
 			</select>
diff --git a/templates/package/view.tmpl b/templates/package/view.tmpl
index ba309b6a77..0116da53b3 100644
--- a/templates/package/view.tmpl
+++ b/templates/package/view.tmpl
@@ -27,6 +27,7 @@
 					{{template "package/content/maven" .}}
 					{{template "package/content/npm" .}}
 					{{template "package/content/nuget" .}}
+					{{template "package/content/pub" .}}
 					{{template "package/content/pypi" .}}
 					{{template "package/content/rubygems" .}}
 				</div>
@@ -48,6 +49,7 @@
 							{{template "package/metadata/maven" .}}
 							{{template "package/metadata/npm" .}}
 							{{template "package/metadata/nuget" .}}
+							{{template "package/metadata/pub" .}}
 							{{template "package/metadata/pypi" .}}
 							{{template "package/metadata/rubygems" .}}
 						</div>
diff --git a/templates/swagger/v1_json.tmpl b/templates/swagger/v1_json.tmpl
index daec38044f..19f16b5c1c 100644
--- a/templates/swagger/v1_json.tmpl
+++ b/templates/swagger/v1_json.tmpl
@@ -1960,6 +1960,7 @@
               "maven",
               "npm",
               "nuget",
+              "pub",
               "pypi",
               "rubygems"
             ],
diff --git a/web_src/svg/gitea-pub.svg b/web_src/svg/gitea-pub.svg
new file mode 100644
index 0000000000..5ec2b8818a
--- /dev/null
+++ b/web_src/svg/gitea-pub.svg
@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg viewBox="0 0 502.87 502.87" xmlns="http://www.w3.org/2000/svg">
+<defs>
+	<style>.cls-1{fill:#01579b;}.cls-2{fill:#40c4ff;}.cls-3{fill:#29b6f6;}.cls-4{fill:#fff;}.cls-4,.cls-5,.cls-6{opacity:0.2;isolation:isolate;}.cls-5{fill:#263238;}.cls-6{fill:url(#a);}</style>
+	<radialGradient id="a" cx="251.42" cy="631.97" r="251.4" gradientTransform="translate(0 -380.56)" gradientUnits="userSpaceOnUse">
+		<stop stop-color="#fff" stop-opacity=".1" offset="0"/>
+		<stop stop-color="#fff" stop-opacity="0" offset="1"/>
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