Add Go package registry (#24687)

Fixes #7608

This PR adds a Go package registry usable with the Go proxy protocol.

![grafik](https://github.com/go-gitea/gitea/assets/1666336/328feb5c-3df2-4f9d-8eae-fe3126d14c37)

23 files changed, 751 insertions, 10 deletions

diff --git a/custom/conf/app.example.ini b/custom/conf/app.example.ini
index fc0c502194..592257b3b9 100644
--- a/custom/conf/app.example.ini
+++ b/custom/conf/app.example.ini
@@ -2463,6 +2463,8 @@ ROUTER = console
 ;LIMIT_SIZE_DEBIAN = -1
 ;; Maximum size of a Generic upload (`-1` means no limits, format `1000`, `1 MB`, `1 GiB`)
 ;LIMIT_SIZE_GENERIC = -1
+;; Maximum size of a Go upload (`-1` means no limits, format `1000`, `1 MB`, `1 GiB`)
+;LIMIT_SIZE_GO = -1
 ;; Maximum size of a Helm upload (`-1` means no limits, format `1000`, `1 MB`, `1 GiB`)
 ;LIMIT_SIZE_HELM = -1
 ;; Maximum size of a Maven upload (`-1` means no limits, format `1000`, `1 MB`, `1 GiB`)
diff --git a/docs/content/doc/administration/config-cheat-sheet.en-us.md b/docs/content/doc/administration/config-cheat-sheet.en-us.md
index 82665d7d2c..27e74f2a25 100644
--- a/docs/content/doc/administration/config-cheat-sheet.en-us.md
+++ b/docs/content/doc/administration/config-cheat-sheet.en-us.md
@@ -1223,6 +1223,7 @@ Task queue configuration has been moved to `queue.task`. However, the below conf
 - `LIMIT_SIZE_CONTAINER`: **-1**: Maximum size of a Container upload (`-1` means no limits, format `1000`, `1 MB`, `1 GiB`)
 - `LIMIT_SIZE_DEBIAN`: **-1**: Maximum size of a Debian upload (`-1` means no limits, format `1000`, `1 MB`, `1 GiB`)
 - `LIMIT_SIZE_GENERIC`: **-1**: Maximum size of a Generic upload (`-1` means no limits, format `1000`, `1 MB`, `1 GiB`)
+- `LIMIT_SIZE_GO`: **-1**: Maximum size of a Go upload (`-1` means no limits, format `1000`, `1 MB`, `1 GiB`)
 - `LIMIT_SIZE_HELM`: **-1**: Maximum size of a Helm upload (`-1` means no limits, format `1000`, `1 MB`, `1 GiB`)
 - `LIMIT_SIZE_MAVEN`: **-1**: Maximum size of a Maven upload (`-1` means no limits, format `1000`, `1 MB`, `1 GiB`)
 - `LIMIT_SIZE_NPM`: **-1**: Maximum size of a npm upload (`-1` means no limits, format `1000`, `1 MB`, `1 GiB`)
diff --git a/docs/content/doc/usage/packages/debian.en-us.md b/docs/content/doc/usage/packages/debian.en-us.md
index 7506b5ce2f..dc73da27cf 100644
--- a/docs/content/doc/usage/packages/debian.en-us.md
+++ b/docs/content/doc/usage/packages/debian.en-us.md
@@ -83,7 +83,7 @@ curl --user your_username:your_password_or_token \
 If you are using 2FA or OAuth use a [personal access token]({{< relref "doc/development/api-usage.en-us.md#authentication" >}}) instead of the password.
 You cannot publish a file with the same name twice to a package. You must delete the existing package version first.
 
-The server reponds with the following HTTP Status codes.
+The server responds with the following HTTP Status codes.
 
 | HTTP Status Code  | Meaning |
 | ----------------- | ------- |
@@ -115,7 +115,7 @@ curl --user your_username:your_token_or_password -X DELETE \
      https://gitea.example.com/api/packages/testuser/debian/pools/bionic/main/test-package/1.0.0/amd64
 ```
 
-The server reponds with the following HTTP Status codes.
+The server responds with the following HTTP Status codes.
 
 | HTTP Status Code  | Meaning |
 | ----------------- | ------- |
diff --git a/docs/content/doc/usage/packages/generic.en-us.md b/docs/content/doc/usage/packages/generic.en-us.md
index fbfe42d50a..447eb692fd 100644
--- a/docs/content/doc/usage/packages/generic.en-us.md
+++ b/docs/content/doc/usage/packages/generic.en-us.md
@@ -51,7 +51,7 @@ curl --user your_username:your_password_or_token \
 
 If you are using 2FA or OAuth use a [personal access token]({{< relref "doc/development/api-usage.en-us.md#authentication" >}}) instead of the password.
 
-The server reponds with the following HTTP Status codes.
+The server responds with the following HTTP Status codes.
 
 | HTTP Status Code  | Meaning |
 | ----------------- | ------- |
@@ -83,7 +83,7 @@ curl --user your_username:your_token_or_password \
      https://gitea.example.com/api/packages/testuser/generic/test_package/1.0.0/file.bin
 ```
 
-The server reponds with the following HTTP Status codes.
+The server responds with the following HTTP Status codes.
 
 | HTTP Status Code  | Meaning |
 | ----------------- | ------- |
@@ -111,7 +111,7 @@ curl --user your_username:your_token_or_password -X DELETE \
      https://gitea.example.com/api/packages/testuser/generic/test_package/1.0.0
 ```
 
-The server reponds with the following HTTP Status codes.
+The server responds with the following HTTP Status codes.
 
 | HTTP Status Code  | Meaning |
 | ----------------- | ------- |
@@ -140,7 +140,7 @@ curl --user your_username:your_token_or_password -X DELETE \
      https://gitea.example.com/api/packages/testuser/generic/test_package/1.0.0/file.bin
 ```
 
-The server reponds with the following HTTP Status codes.
+The server responds with the following HTTP Status codes.
 
 | HTTP Status Code  | Meaning |
 | ----------------- | ------- |
diff --git a/docs/content/doc/usage/packages/go.en-us.md b/docs/content/doc/usage/packages/go.en-us.md
new file mode 100644
index 0000000000..92f5eb5e93
--- /dev/null
+++ b/docs/content/doc/usage/packages/go.en-us.md
@@ -0,0 +1,77 @@
+---
+date: "2023-05-10T00:00:00+00:00"
+title: "Go Packages Repository"
+slug: "go"
+weight: 45
+draft: false
+toc: false
+menu:
+  sidebar:
+    parent: "packages"
+    name: "Go"
+    weight: 45
+    identifier: "go"
+---
+
+# Go Packages Repository
+
+Publish Go packages for your user or organization.
+
+**Table of Contents**
+
+{{< toc >}}
+
+## Publish a package
+
+To publish a Go package perform a HTTP `PUT` operation with the package content in the request body.
+You cannot publish a package if a package of the same name and version already exists. You must delete the existing package first.
+The package must follow the [documented structure](https://go.dev/ref/mod#zip-files).
+
+```
+PUT https://gitea.example.com/api/packages/{owner}/go/upload
+```
+
+| Parameter | Description |
+| --------- | ----------- |
+| `owner`   | The owner of the package. |
+
+To authenticate to the package registry, you need to provide [custom HTTP headers or use HTTP Basic authentication]({{< relref "doc/development/api-usage.en-us.md#authentication" >}}):
+
+```shell
+curl --user your_username:your_password_or_token \
+     --upload-file path/to/file.zip \
+     https://gitea.example.com/api/packages/testuser/go/upload
+```
+
+If you are using 2FA or OAuth use a [personal access token]({{< relref "doc/development/api-usage.en-us.md#authentication" >}}) instead of the password.
+
+The server responds with the following HTTP Status codes.
+
+| HTTP Status Code  | Meaning |
+| ----------------- | ------- |
+| `201 Created`     | The package has been published. |
+| `400 Bad Request` | The package is invalid. |
+| `409 Conflict`    | A package with the same name exist already. |
+
+## Install a package
+
+To install a Go package instruct Go to use the package registry as proxy:
+
+```shell
+# use latest version
+GOPROXY=https://gitea.example.com/api/packages/{owner}/go go install {package_name}
+# or
+GOPROXY=https://gitea.example.com/api/packages/{owner}/go go install {package_name}@latest
+# use specific version
+GOPROXY=https://gitea.example.com/api/packages/{owner}/go go install {package_name}@{package_version}
+```
+
+| Parameter         | Description |
+| ----------------- | ----------- |
+| `owner`           | The owner of the package. |
+| `package_name`    | The package name. |
+| `package_version` | The package version. |
+
+If the owner of the packages is private you need to [provide credentials](https://go.dev/ref/mod#private-module-proxy-auth).
+
+More information about the `GOPROXY` environment variable and how to protect against data leaks can be found in [the documentation](https://go.dev/ref/mod#private-modules).
diff --git a/docs/content/doc/usage/packages/rpm.en-us.md b/docs/content/doc/usage/packages/rpm.en-us.md
index 2f9bb539be..7b256046c5 100644
--- a/docs/content/doc/usage/packages/rpm.en-us.md
+++ b/docs/content/doc/usage/packages/rpm.en-us.md
@@ -69,7 +69,7 @@ curl --user your_username:your_password_or_token \
 If you are using 2FA or OAuth use a [personal access token]({{< relref "doc/development/api-usage.en-us.md#authentication" >}}) instead of the password.
 You cannot publish a file with the same name twice to a package. You must delete the existing package version first.
 
-The server reponds with the following HTTP Status codes.
+The server responds with the following HTTP Status codes.
 
 | HTTP Status Code  | Meaning |
 | ----------------- | ------- |
@@ -99,7 +99,7 @@ curl --user your_username:your_token_or_password -X DELETE \
      https://gitea.example.com/api/packages/testuser/rpm/test-package/1.0.0/x86_64
 ```
 
-The server reponds with the following HTTP Status codes.
+The server responds with the following HTTP Status codes.
 
 | HTTP Status Code  | Meaning |
 | ----------------- | ------- |
diff --git a/models/packages/descriptor.go b/models/packages/descriptor.go
index a69f477115..8e01650866 100644
--- a/models/packages/descriptor.go
+++ b/models/packages/descriptor.go
@@ -155,6 +155,8 @@ func GetPackageDescriptor(ctx context.Context, pv *PackageVersion) (*PackageDesc
 		metadata = &debian.Metadata{}
 	case TypeGeneric:
 		// generic packages have no metadata
+	case TypeGo:
+		// go packages have no metadata
 	case TypeHelm:
 		metadata = &helm.Metadata{}
 	case TypeNuGet:
diff --git a/models/packages/package.go b/models/packages/package.go
index 17d4d79f30..2dfed78046 100644
--- a/models/packages/package.go
+++ b/models/packages/package.go
@@ -39,6 +39,7 @@ const (
 	TypeContainer Type = "container"
 	TypeDebian    Type = "debian"
 	TypeGeneric   Type = "generic"
+	TypeGo        Type = "go"
 	TypeHelm      Type = "helm"
 	TypeMaven     Type = "maven"
 	TypeNpm       Type = "npm"
@@ -61,6 +62,7 @@ var TypeList = []Type{
 	TypeContainer,
 	TypeDebian,
 	TypeGeneric,
+	TypeGo,
 	TypeHelm,
 	TypeMaven,
 	TypeNpm,
@@ -94,6 +96,8 @@ func (pt Type) Name() string {
 		return "Debian"
 	case TypeGeneric:
 		return "Generic"
+	case TypeGo:
+		return "Go"
 	case TypeHelm:
 		return "Helm"
 	case TypeMaven:
@@ -139,6 +143,8 @@ func (pt Type) SVGName() string {
 		return "gitea-debian"
 	case TypeGeneric:
 		return "octicon-package"
+	case TypeGo:
+		return "gitea-go"
 	case TypeHelm:
 		return "gitea-helm"
 	case TypeMaven:
diff --git a/modules/packages/goproxy/metadata.go b/modules/packages/goproxy/metadata.go
new file mode 100644
index 0000000000..40f7d20508
--- /dev/null
+++ b/modules/packages/goproxy/metadata.go
@@ -0,0 +1,94 @@
+// Copyright 2023 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package goproxy
+
+import (
+	"archive/zip"
+	"fmt"
+	"io"
+	"path"
+	"strings"
+
+	"code.gitea.io/gitea/modules/util"
+)
+
+const (
+	PropertyGoMod = "go.mod"
+
+	maxGoModFileSize = 16 * 1024 * 1024 // https://go.dev/ref/mod#zip-path-size-constraints
+)
+
+var (
+	ErrInvalidStructure  = util.NewInvalidArgumentErrorf("package has invalid structure")
+	ErrGoModFileTooLarge = util.NewInvalidArgumentErrorf("go.mod file is too large")
+)
+
+type Package struct {
+	Name    string
+	Version string
+	GoMod   string
+}
+
+// ParsePackage parses the Go package file
+// https://go.dev/ref/mod#zip-files
+func ParsePackage(r io.ReaderAt, size int64) (*Package, error) {
+	archive, err := zip.NewReader(r, size)
+	if err != nil {
+		return nil, err
+	}
+
+	var p *Package
+
+	for _, file := range archive.File {
+		nameAndVersion := path.Dir(file.Name)
+
+		parts := strings.SplitN(nameAndVersion, "@", 2)
+		if len(parts) != 2 {
+			continue
+		}
+
+		versionParts := strings.SplitN(parts[1], "/", 2)
+
+		if p == nil {
+			p = &Package{
+				Name:    strings.TrimSuffix(nameAndVersion, "@"+parts[1]),
+				Version: versionParts[0],
+			}
+		}
+
+		if len(versionParts) > 1 {
+			// files are expected in the "root" folder
+			continue
+		}
+
+		if path.Base(file.Name) == "go.mod" {
+			if file.UncompressedSize64 > maxGoModFileSize {
+				return nil, ErrGoModFileTooLarge
+			}
+
+			f, err := archive.Open(file.Name)
+			if err != nil {
+				return nil, err
+			}
+			defer f.Close()
+
+			bytes, err := io.ReadAll(&io.LimitedReader{R: f, N: maxGoModFileSize})
+			if err != nil {
+				return nil, err
+			}
+
+			p.GoMod = string(bytes)
+
+			return p, nil
+		}
+	}
+
+	if p == nil {
+		return nil, ErrInvalidStructure
+	}
+
+	p.GoMod = fmt.Sprintf("module %s", p.Name)
+
+	return p, nil
+}
diff --git a/modules/packages/goproxy/metadata_test.go b/modules/packages/goproxy/metadata_test.go
new file mode 100644
index 0000000000..4e7f394f8b
--- /dev/null
+++ b/modules/packages/goproxy/metadata_test.go
@@ -0,0 +1,75 @@
+// Copyright 2023 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package goproxy
+
+import (
+	"archive/zip"
+	"bytes"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+const (
+	packageName    = "gitea.com/go-gitea/gitea"
+	packageVersion = "v0.0.1"
+)
+
+func TestParsePackage(t *testing.T) {
+	createArchive := func(files map[string][]byte) *bytes.Reader {
+		var buf bytes.Buffer
+		zw := zip.NewWriter(&buf)
+		for name, content := range files {
+			w, _ := zw.Create(name)
+			w.Write(content)
+		}
+		zw.Close()
+		return bytes.NewReader(buf.Bytes())
+	}
+
+	t.Run("EmptyPackage", func(t *testing.T) {
+		data := createArchive(nil)
+
+		p, err := ParsePackage(data, int64(data.Len()))
+		assert.Nil(t, p)
+		assert.ErrorIs(t, err, ErrInvalidStructure)
+	})
+
+	t.Run("InvalidNameOrVersionStructure", func(t *testing.T) {
+		data := createArchive(map[string][]byte{
+			packageName + "/" + packageVersion + "/go.mod": {},
+		})
+
+		p, err := ParsePackage(data, int64(data.Len()))
+		assert.Nil(t, p)
+		assert.ErrorIs(t, err, ErrInvalidStructure)
+	})
+
+	t.Run("GoModFileInWrongDirectory", func(t *testing.T) {
+		data := createArchive(map[string][]byte{
+			packageName + "@" + packageVersion + "/subdir/go.mod": {},
+		})
+
+		p, err := ParsePackage(data, int64(data.Len()))
+		assert.NotNil(t, p)
+		assert.NoError(t, err)
+		assert.Equal(t, packageName, p.Name)
+		assert.Equal(t, packageVersion, p.Version)
+		assert.Equal(t, "module gitea.com/go-gitea/gitea", p.GoMod)
+	})
+
+	t.Run("Valid", func(t *testing.T) {
+		data := createArchive(map[string][]byte{
+			packageName + "@" + packageVersion + "/subdir/go.mod": []byte("invalid"),
+			packageName + "@" + packageVersion + "/go.mod":        []byte("valid"),
+		})
+
+		p, err := ParsePackage(data, int64(data.Len()))
+		assert.NotNil(t, p)
+		assert.NoError(t, err)
+		assert.Equal(t, packageName, p.Name)
+		assert.Equal(t, packageVersion, p.Version)
+		assert.Equal(t, "valid", p.GoMod)
+	})
+}
diff --git a/modules/setting/packages.go b/modules/setting/packages.go
index 3719e2f644..a9b91adf16 100644
--- a/modules/setting/packages.go
+++ b/modules/setting/packages.go
@@ -33,6 +33,7 @@ var (
 		LimitSizeContainer   int64
 		LimitSizeDebian      int64
 		LimitSizeGeneric     int64
+		LimitSizeGo          int64
 		LimitSizeHelm        int64
 		LimitSizeMaven       int64
 		LimitSizeNpm         int64
@@ -79,6 +80,7 @@ func loadPackagesFrom(rootCfg ConfigProvider) {
 	Packages.LimitSizeContainer = mustBytes(sec, "LIMIT_SIZE_CONTAINER")
 	Packages.LimitSizeDebian = mustBytes(sec, "LIMIT_SIZE_DEBIAN")
 	Packages.LimitSizeGeneric = mustBytes(sec, "LIMIT_SIZE_GENERIC")
+	Packages.LimitSizeGo = mustBytes(sec, "LIMIT_SIZE_GO")
 	Packages.LimitSizeHelm = mustBytes(sec, "LIMIT_SIZE_HELM")
 	Packages.LimitSizeMaven = mustBytes(sec, "LIMIT_SIZE_MAVEN")
 	Packages.LimitSizeNpm = mustBytes(sec, "LIMIT_SIZE_NPM")
diff --git a/options/locale/locale_en-US.ini b/options/locale/locale_en-US.ini
index 18b8bffe4a..0385c28c4d 100644
--- a/options/locale/locale_en-US.ini
+++ b/options/locale/locale_en-US.ini
@@ -3263,6 +3263,8 @@ debian.repository.components = Components
 debian.repository.architectures = Architectures
 generic.download = Download package from the command line:
 generic.documentation = For more information on the generic registry, see <a target="_blank" rel="noopener noreferrer" href="%s">the documentation</a>.
+go.install = Install the package from the command line:
+go.documentation = For more information on the Go registry, see <a target="_blank" rel="noopener noreferrer" href="%s">the documentation</a>.
 helm.registry = Setup this registry from the command line:
 helm.install = To install the package, run the following command:
 helm.documentation = For more information on the Helm registry, see <a target="_blank" rel="noopener noreferrer" href="%s">the documentation</a>.
diff --git a/public/img/svg/gitea-go.svg b/public/img/svg/gitea-go.svg
new file mode 100644
index 0000000000..a432bdbf21
--- /dev/null
+++ b/public/img/svg/gitea-go.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" xml:space="preserve" viewBox="24.7 77.83 205.42 76.8" class="svg gitea-go" width="16" height="16" aria-hidden="true"><g style="fill:#00acd7"><path d="M40.2 101.1c-.4 0-.5-.2-.3-.5l2.1-2.7c.2-.3.7-.5 1.1-.5h35.7c.4 0 .5.3.3.6l-1.7 2.6c-.2.3-.7.6-1 .6l-36.2-.1zM25.1 110.3c-.4 0-.5-.2-.3-.5l2.1-2.7c.2-.3.7-.5 1.1-.5h45.6c.4 0 .6.3.5.6l-.8 2.4c-.1.4-.5.6-.9.6l-47.3.1zM49.3 119.5c-.4 0-.5-.3-.3-.6l1.4-2.5c.2-.3.6-.6 1-.6h20c.4 0 .6.3.6.7l-.2 2.4c0 .4-.4.7-.7.7l-21.8-.1zM153.1 99.3c-6.3 1.6-10.6 2.8-16.8 4.4-1.5.4-1.6.5-2.9-1-1.5-1.7-2.6-2.8-4.7-3.8-6.3-3.1-12.4-2.2-18.1 1.5-6.8 4.4-10.3 10.9-10.2 19 .1 8 5.6 14.6 13.5 15.7 6.8.9 12.5-1.5 17-6.6.9-1.1 1.7-2.3 2.7-3.7h-19.3c-2.1 0-2.6-1.3-1.9-3 1.3-3.1 3.7-8.3 5.1-10.9.3-.6 1-1.6 2.5-1.6h36.4c-.2 2.7-.2 5.4-.6 8.1-1.1 7.2-3.8 13.8-8.2 19.6-7.2 9.5-16.6 15.4-28.5 17-9.8 1.3-18.9-.6-26.9-6.6-7.4-5.6-11.6-13-12.7-22.2-1.3-10.9 1.9-20.7 8.5-29.3 7.1-9.3 16.5-15.2 28-17.3 9.4-1.7 18.4-.6 26.5 4.9 5.3 3.5 9.1 8.3 11.6 14.1.6.9.2 1.4-1 1.7z"/><path d="M186.2 154.6c-9.1-.2-17.4-2.8-24.4-8.8-5.9-5.1-9.6-11.6-10.8-19.3-1.8-11.3 1.3-21.3 8.1-30.2 7.3-9.6 16.1-14.6 28-16.7 10.2-1.8 19.8-.8 28.5 5.1 7.9 5.4 12.8 12.7 14.1 22.3 1.7 13.5-2.2 24.5-11.5 33.9-6.6 6.7-14.7 10.9-24 12.8-2.7.5-5.4.6-8 .9zm23.8-40.4c-.1-1.3-.1-2.3-.3-3.3-1.8-9.9-10.9-15.5-20.4-13.3-9.3 2.1-15.3 8-17.5 17.4-1.8 7.8 2 15.7 9.2 18.9 5.5 2.4 11 2.1 16.3-.6 7.9-4.1 12.2-10.5 12.7-19.1z"/></g></svg>
\ No newline at end of file
diff --git a/routers/api/packages/api.go b/routers/api/packages/api.go
index 355387332e..aaceb8a92b 100644
--- a/routers/api/packages/api.go
+++ b/routers/api/packages/api.go
@@ -24,6 +24,7 @@ import (
 	"code.gitea.io/gitea/routers/api/packages/container"
 	"code.gitea.io/gitea/routers/api/packages/debian"
 	"code.gitea.io/gitea/routers/api/packages/generic"
+	"code.gitea.io/gitea/routers/api/packages/goproxy"
 	"code.gitea.io/gitea/routers/api/packages/helm"
 	"code.gitea.io/gitea/routers/api/packages/maven"
 	"code.gitea.io/gitea/routers/api/packages/npm"
@@ -312,6 +313,64 @@ func CommonRoutes(ctx gocontext.Context) *web.Route {
 				}, reqPackageAccess(perm.AccessModeWrite))
 			})
 		}, reqPackageAccess(perm.AccessModeRead))
+		r.Group("/go", func() {
+			r.Put("/upload", reqPackageAccess(perm.AccessModeWrite), goproxy.UploadPackage)
+			r.Get("/sumdb/sum.golang.org/supported", func(ctx *context.Context) {
+				ctx.Status(http.StatusNotFound)
+			})
+
+			// Manual mapping of routes because the package name contains slashes which chi does not support
+			// https://go.dev/ref/mod#goproxy-protocol
+			r.Get("/*", func(ctx *context.Context) {
+				path := ctx.Params("*")
+
+				if strings.HasSuffix(path, "/@latest") {
+					ctx.SetParams("name", path[:len(path)-len("/@latest")])
+					ctx.SetParams("version", "latest")
+
+					goproxy.PackageVersionMetadata(ctx)
+					return
+				}
+
+				parts := strings.SplitN(path, "/@v/", 2)
+				if len(parts) != 2 {
+					ctx.Status(http.StatusNotFound)
+					return
+				}
+
+				ctx.SetParams("name", parts[0])
+
+				// <package/name>/@v/list
+				if parts[1] == "list" {
+					goproxy.EnumeratePackageVersions(ctx)
+					return
+				}
+
+				// <package/name>/@v/<version>.zip
+				if strings.HasSuffix(parts[1], ".zip") {
+					ctx.SetParams("version", parts[1][:len(parts[1])-len(".zip")])
+
+					goproxy.DownloadPackageFile(ctx)
+					return
+				}
+				// <package/name>/@v/<version>.info
+				if strings.HasSuffix(parts[1], ".info") {
+					ctx.SetParams("version", parts[1][:len(parts[1])-len(".info")])
+
+					goproxy.PackageVersionMetadata(ctx)
+					return
+				}
+				// <package/name>/@v/<version>.mod
+				if strings.HasSuffix(parts[1], ".mod") {
+					ctx.SetParams("version", parts[1][:len(parts[1])-len(".mod")])
+
+					goproxy.PackageVersionGoModContent(ctx)
+					return
+				}
+
+				ctx.Status(http.StatusNotFound)
+			})
+		}, reqPackageAccess(perm.AccessModeRead))
 		r.Group("/generic", func() {
 			r.Group("/{packagename}/{packageversion}", func() {
 				r.Delete("", reqPackageAccess(perm.AccessModeWrite), generic.DeletePackage)
diff --git a/routers/api/packages/goproxy/goproxy.go b/routers/api/packages/goproxy/goproxy.go
new file mode 100644
index 0000000000..d0bc9c1e98
--- /dev/null
+++ b/routers/api/packages/goproxy/goproxy.go
@@ -0,0 +1,226 @@
+// Copyright 2023 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package goproxy
+
+import (
+	"errors"
+	"fmt"
+	"io"
+	"net/http"
+	"sort"
+	"time"
+
+	packages_model "code.gitea.io/gitea/models/packages"
+	"code.gitea.io/gitea/modules/context"
+	packages_module "code.gitea.io/gitea/modules/packages"
+	goproxy_module "code.gitea.io/gitea/modules/packages/goproxy"
+	"code.gitea.io/gitea/modules/util"
+	"code.gitea.io/gitea/routers/api/packages/helper"
+	packages_service "code.gitea.io/gitea/services/packages"
+)
+
+func apiError(ctx *context.Context, status int, obj interface{}) {
+	helper.LogAndProcessError(ctx, status, obj, func(message string) {
+		ctx.PlainText(status, message)
+	})
+}
+
+func EnumeratePackageVersions(ctx *context.Context) {
+	pvs, err := packages_model.GetVersionsByPackageName(ctx, ctx.Package.Owner.ID, packages_model.TypeGo, ctx.Params("name"))
+	if err != nil {
+		apiError(ctx, http.StatusInternalServerError, err)
+		return
+	}
+	if len(pvs) == 0 {
+		apiError(ctx, http.StatusNotFound, err)
+		return
+	}
+
+	sort.Slice(pvs, func(i, j int) bool {
+		return pvs[i].CreatedUnix < pvs[j].CreatedUnix
+	})
+
+	ctx.Resp.Header().Set("Content-Type", "text/plain;charset=utf-8")
+
+	for _, pv := range pvs {
+		fmt.Fprintln(ctx.Resp, pv.Version)
+	}
+}
+
+func PackageVersionMetadata(ctx *context.Context) {
+	pv, err := resolvePackage(ctx, ctx.Package.Owner.ID, ctx.Params("name"), ctx.Params("version"))
+	if err != nil {
+		if errors.Is(err, util.ErrNotExist) {
+			apiError(ctx, http.StatusNotFound, err)
+		} else {
+			apiError(ctx, http.StatusInternalServerError, err)
+		}
+		return
+	}
+
+	ctx.JSON(http.StatusOK, struct {
+		Version string    `json:"Version"`
+		Time    time.Time `json:"Time"`
+	}{
+		Version: pv.Version,
+		Time:    pv.CreatedUnix.AsLocalTime(),
+	})
+}
+
+func PackageVersionGoModContent(ctx *context.Context) {
+	pv, err := resolvePackage(ctx, ctx.Package.Owner.ID, ctx.Params("name"), ctx.Params("version"))
+	if err != nil {
+		if errors.Is(err, util.ErrNotExist) {
+			apiError(ctx, http.StatusNotFound, err)
+		} else {
+			apiError(ctx, http.StatusInternalServerError, err)
+		}
+		return
+	}
+
+	pps, err := packages_model.GetPropertiesByName(ctx, packages_model.PropertyTypeVersion, pv.ID, goproxy_module.PropertyGoMod)
+	if err != nil || len(pps) != 1 {
+		apiError(ctx, http.StatusInternalServerError, err)
+		return
+	}
+
+	ctx.PlainText(http.StatusOK, pps[0].Value)
+}
+
+func DownloadPackageFile(ctx *context.Context) {
+	pv, err := resolvePackage(ctx, ctx.Package.Owner.ID, ctx.Params("name"), ctx.Params("version"))
+	if err != nil {
+		if errors.Is(err, util.ErrNotExist) {
+			apiError(ctx, http.StatusNotFound, err)
+		} else {
+			apiError(ctx, http.StatusInternalServerError, err)
+		}
+		return
+	}
+
+	pfs, err := packages_model.GetFilesByVersionID(ctx, pv.ID)
+	if err != nil || len(pfs) != 1 {
+		apiError(ctx, http.StatusInternalServerError, err)
+		return
+	}
+
+	s, _, err := packages_service.GetPackageFileStream(ctx, pfs[0])
+	if err != nil {
+		if errors.Is(err, util.ErrNotExist) {
+			apiError(ctx, http.StatusNotFound, err)
+		} else {
+			apiError(ctx, http.StatusInternalServerError, err)
+		}
+		return
+	}
+	defer s.Close()
+
+	ctx.ServeContent(s, &context.ServeHeaderOptions{
+		Filename:     pfs[0].Name,
+		LastModified: pfs[0].CreatedUnix.AsLocalTime(),
+	})
+}
+
+func resolvePackage(ctx *context.Context, ownerID int64, name, version string) (*packages_model.PackageVersion, error) {
+	var pv *packages_model.PackageVersion
+
+	if version == "latest" {
+		pvs, _, err := packages_model.SearchLatestVersions(ctx, &packages_model.PackageSearchOptions{
+			OwnerID: ownerID,
+			Type:    packages_model.TypeGo,
+			Name: packages_model.SearchValue{
+				Value:      name,
+				ExactMatch: true,
+			},
+			IsInternal: util.OptionalBoolFalse,
+			Sort:       packages_model.SortCreatedDesc,
+		})
+		if err != nil {
+			return nil, err
+		}
+
+		if len(pvs) != 1 {
+			return nil, packages_model.ErrPackageNotExist
+		}
+
+		pv = pvs[0]
+	} else {
+		var err error
+		pv, err = packages_model.GetVersionByNameAndVersion(ctx, ownerID, packages_model.TypeGo, name, version)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	return pv, nil
+}
+
+func UploadPackage(ctx *context.Context) {
+	upload, close, err := ctx.UploadStream()
+	if err != nil {
+		apiError(ctx, http.StatusInternalServerError, err)
+		return
+	}
+	if close {
+		defer upload.Close()
+	}
+
+	buf, err := packages_module.CreateHashedBufferFromReader(upload)
+	if err != nil {
+		apiError(ctx, http.StatusInternalServerError, err)
+		return
+	}
+	defer buf.Close()
+
+	pck, err := goproxy_module.ParsePackage(buf, buf.Size())
+	if err != nil {
+		if errors.Is(err, util.ErrInvalidArgument) {
+			apiError(ctx, http.StatusBadRequest, err)
+		} else {
+			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.TypeGo,
+				Name:        pck.Name,
+				Version:     pck.Version,
+			},
+			Creator: ctx.Doer,
+			VersionProperties: map[string]string{
+				goproxy_module.PropertyGoMod: pck.GoMod,
+			},
+		},
+		&packages_service.PackageFileCreationInfo{
+			PackageFileInfo: packages_service.PackageFileInfo{
+				Filename: fmt.Sprintf("%v.zip", pck.Version),
+			},
+			Creator: ctx.Doer,
+			Data:    buf,
+			IsLead:  true,
+		},
+	)
+	if err != nil {
+		switch err {
+		case packages_model.ErrDuplicatePackageVersion:
+			apiError(ctx, http.StatusConflict, err)
+		case packages_service.ErrQuotaTotalCount, packages_service.ErrQuotaTypeSize, packages_service.ErrQuotaTotalSize:
+			apiError(ctx, http.StatusForbidden, err)
+		default:
+			apiError(ctx, http.StatusInternalServerError, err)
+		}
+		return
+	}
+
+	ctx.Status(http.StatusCreated)
+}
diff --git a/routers/api/v1/packages/package.go b/routers/api/v1/packages/package.go
index d7277247fc..0c9a134281 100644
--- a/routers/api/v1/packages/package.go
+++ b/routers/api/v1/packages/package.go
@@ -40,7 +40,7 @@ func ListPackages(ctx *context.APIContext) {
 	//   in: query
 	//   description: package type filter
 	//   type: string
-	//   enum: [alpine, cargo, chef, composer, conan, conda, container, debian, generic, helm, maven, npm, nuget, pub, pypi, rpm, rubygems, swift, vagrant]
+	//   enum: [alpine, cargo, chef, composer, conan, conda, container, debian, generic, go, helm, maven, npm, nuget, pub, pypi, rpm, rubygems, swift, vagrant]
 	// - name: q
 	//   in: query
 	//   description: name filter
diff --git a/services/forms/package_form.go b/services/forms/package_form.go
index 96209ec840..dfec98fff4 100644
--- a/services/forms/package_form.go
+++ b/services/forms/package_form.go
@@ -15,7 +15,7 @@ import (
 type PackageCleanupRuleForm struct {
 	ID            int64
 	Enabled       bool
-	Type          string `binding:"Required;In(alpine,cargo,chef,composer,conan,conda,container,debian,generic,helm,maven,npm,nuget,pub,pypi,rpm,rubygems,swift,vagrant)"`
+	Type          string `binding:"Required;In(alpine,cargo,chef,composer,conan,conda,container,debian,generic,go,helm,maven,npm,nuget,pub,pypi,rpm,rubygems,swift,vagrant)"`
 	KeepCount     int    `binding:"In(0,1,5,10,25,50,100)"`
 	KeepPattern   string `binding:"RegexPattern"`
 	RemoveDays    int    `binding:"In(0,7,14,30,60,90,180)"`
diff --git a/services/packages/packages.go b/services/packages/packages.go
index bf64890f4e..9d5ce04a0e 100644
--- a/services/packages/packages.go
+++ b/services/packages/packages.go
@@ -369,6 +369,8 @@ func CheckSizeQuotaExceeded(ctx context.Context, doer, owner *user_model.User, p
 		typeSpecificSize = setting.Packages.LimitSizeDebian
 	case packages_model.TypeGeneric:
 		typeSpecificSize = setting.Packages.LimitSizeGeneric
+	case packages_model.TypeGo:
+		typeSpecificSize = setting.Packages.LimitSizeGo
 	case packages_model.TypeHelm:
 		typeSpecificSize = setting.Packages.LimitSizeHelm
 	case packages_model.TypeMaven:
diff --git a/templates/package/content/go.tmpl b/templates/package/content/go.tmpl
new file mode 100644
index 0000000000..2343d945b3
--- /dev/null
+++ b/templates/package/content/go.tmpl
@@ -0,0 +1,14 @@
+{{if eq .PackageDescriptor.Package.Type "go"}}
+	<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.go.install"}}</label>
+				<div class="markup"><pre class="code-block"><code>GOPROXY=<gitea-origin-url data-url="{{AppSubUrl}}/api/packages/{{$.PackageDescriptor.Owner.Name}}/go"></gitea-origin-url> go install {{$.PackageDescriptor.Package.Name}}@{{$.PackageDescriptor.Version.Version}}</code></pre></div>
+			</div>
+			<div class="field">
+				<label>{{.locale.Tr "packages.go.documentation" "https://docs.gitea.io/en-us/usage/packages/go" | Safe}}</label>
+			</div>
+		</div>
+	</div>
+{{end}}
diff --git a/templates/package/view.tmpl b/templates/package/view.tmpl
index 3c42c3adfd..5285a0838d 100644
--- a/templates/package/view.tmpl
+++ b/templates/package/view.tmpl
@@ -28,6 +28,7 @@
 					{{template "package/content/container" .}}
 					{{template "package/content/debian" .}}
 					{{template "package/content/generic" .}}
+					{{template "package/content/go" .}}
 					{{template "package/content/helm" .}}
 					{{template "package/content/maven" .}}
 					{{template "package/content/npm" .}}
diff --git a/templates/swagger/v1_json.tmpl b/templates/swagger/v1_json.tmpl
index 01055cb00d..3859eb5567 100644
--- a/templates/swagger/v1_json.tmpl
+++ b/templates/swagger/v1_json.tmpl
@@ -2418,6 +2418,7 @@
               "container",
               "debian",
               "generic",
+              "go",
               "helm",
               "maven",
               "npm",
diff --git a/tests/integration/api_packages_goproxy_test.go b/tests/integration/api_packages_goproxy_test.go
new file mode 100644
index 0000000000..08c1ca54f1
--- /dev/null
+++ b/tests/integration/api_packages_goproxy_test.go
@@ -0,0 +1,166 @@
+// Copyright 2023 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package integration
+
+import (
+	"archive/zip"
+	"bytes"
+	"fmt"
+	"net/http"
+	"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"
+	"code.gitea.io/gitea/tests"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestPackageGo(t *testing.T) {
+	defer tests.PrepareTestEnv(t)()
+
+	user := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 2})
+
+	packageName := "gitea.com/go-gitea/gitea"
+	packageVersion := "v0.0.1"
+	packageVersion2 := "v0.0.2"
+	goModContent := `module "gitea.com/go-gitea/gitea"`
+
+	createArchive := func(files map[string][]byte) []byte {
+		var buf bytes.Buffer
+		zw := zip.NewWriter(&buf)
+		for name, content := range files {
+			w, _ := zw.Create(name)
+			w.Write(content)
+		}
+		zw.Close()
+		return buf.Bytes()
+	}
+
+	url := fmt.Sprintf("/api/packages/%s/go", user.Name)
+
+	t.Run("Upload", func(t *testing.T) {
+		defer tests.PrintCurrentTest(t)()
+
+		content := createArchive(nil)
+
+		req := NewRequestWithBody(t, "PUT", url+"/upload", bytes.NewReader(content))
+		MakeRequest(t, req, http.StatusUnauthorized)
+
+		req = NewRequestWithBody(t, "PUT", url+"/upload", bytes.NewReader(content))
+		AddBasicAuthHeader(req, user.Name)
+		MakeRequest(t, req, http.StatusBadRequest)
+
+		content = createArchive(map[string][]byte{
+			packageName + "@" + packageVersion + "/go.mod": []byte(goModContent),
+		})
+
+		req = NewRequestWithBody(t, "PUT", url+"/upload", bytes.NewReader(content))
+		AddBasicAuthHeader(req, user.Name)
+		MakeRequest(t, req, http.StatusCreated)
+
+		pvs, err := packages.GetVersionsByPackageType(db.DefaultContext, user.ID, packages.TypeGo)
+		assert.NoError(t, err)
+		assert.Len(t, pvs, 1)
+
+		pd, err := packages.GetPackageDescriptor(db.DefaultContext, pvs[0])
+		assert.NoError(t, err)
+		assert.Nil(t, 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, packageVersion+".zip", 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)
+
+		req = NewRequestWithBody(t, "PUT", url+"/upload", bytes.NewReader(content))
+		AddBasicAuthHeader(req, user.Name)
+		MakeRequest(t, req, http.StatusConflict)
+
+		time.Sleep(time.Second)
+
+		content = createArchive(map[string][]byte{
+			packageName + "@" + packageVersion2 + "/go.mod": []byte(goModContent),
+		})
+
+		req = NewRequestWithBody(t, "PUT", url+"/upload", bytes.NewReader(content))
+		AddBasicAuthHeader(req, user.Name)
+		MakeRequest(t, req, http.StatusCreated)
+	})
+
+	t.Run("List", func(t *testing.T) {
+		defer tests.PrintCurrentTest(t)()
+
+		req := NewRequest(t, "GET", fmt.Sprintf("%s/%s/@v/list", url, packageName))
+		resp := MakeRequest(t, req, http.StatusOK)
+
+		assert.Equal(t, packageVersion+"\n"+packageVersion2+"\n", resp.Body.String())
+	})
+
+	t.Run("Info", func(t *testing.T) {
+		defer tests.PrintCurrentTest(t)()
+
+		req := NewRequest(t, "GET", fmt.Sprintf("%s/%s/@v/%s.info", url, packageName, packageVersion))
+		resp := MakeRequest(t, req, http.StatusOK)
+
+		type Info struct {
+			Version string    `json:"Version"`
+			Time    time.Time `json:"Time"`
+		}
+
+		info := &Info{}
+		DecodeJSON(t, resp, &info)
+
+		assert.Equal(t, packageVersion, info.Version)
+
+		req = NewRequest(t, "GET", fmt.Sprintf("%s/%s/@v/latest.info", url, packageName))
+		resp = MakeRequest(t, req, http.StatusOK)
+
+		info = &Info{}
+		DecodeJSON(t, resp, &info)
+
+		assert.Equal(t, packageVersion2, info.Version)
+
+		req = NewRequest(t, "GET", fmt.Sprintf("%s/%s/@latest", url, packageName))
+		resp = MakeRequest(t, req, http.StatusOK)
+
+		info = &Info{}
+		DecodeJSON(t, resp, &info)
+
+		assert.Equal(t, packageVersion2, info.Version)
+	})
+
+	t.Run("GoMod", func(t *testing.T) {
+		defer tests.PrintCurrentTest(t)()
+
+		req := NewRequest(t, "GET", fmt.Sprintf("%s/%s/@v/%s.mod", url, packageName, packageVersion))
+		resp := MakeRequest(t, req, http.StatusOK)
+
+		assert.Equal(t, goModContent, resp.Body.String())
+
+		req = NewRequest(t, "GET", fmt.Sprintf("%s/%s/@v/latest.mod", url, packageName))
+		resp = MakeRequest(t, req, http.StatusOK)
+
+		assert.Equal(t, goModContent, resp.Body.String())
+	})
+
+	t.Run("Download", func(t *testing.T) {
+		defer tests.PrintCurrentTest(t)()
+
+		req := NewRequest(t, "GET", fmt.Sprintf("%s/%s/@v/%s.zip", url, packageName, packageVersion))
+		MakeRequest(t, req, http.StatusOK)
+
+		req = NewRequest(t, "GET", fmt.Sprintf("%s/%s/@v/latest.zip", url, packageName))
+		MakeRequest(t, req, http.StatusOK)
+	})
+}
diff --git a/web_src/svg/gitea-go.svg b/web_src/svg/gitea-go.svg
new file mode 100644
index 0000000000..84e201ed16
--- /dev/null
+++ b/web_src/svg/gitea-go.svg
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="24.7 77.83 205.42 76.8" xml:space="preserve">
+<g style="fill:#00ACD7">
+	<path d="M40.2,101.1c-0.4,0-0.5-0.2-0.3-0.5l2.1-2.7c0.2-0.3,0.7-0.5,1.1-0.5l35.7,0c0.4,0,0.5,0.3,0.3,0.6 l-1.7,2.6c-0.2,0.3-0.7,0.6-1,0.6L40.2,101.1z"/>
+	<path d="M25.1,110.3c-0.4,0-0.5-0.2-0.3-0.5l2.1-2.7c0.2-0.3,0.7-0.5,1.1-0.5l45.6,0c0.4,0,0.6,0.3,0.5,0.6 l-0.8,2.4c-0.1,0.4-0.5,0.6-0.9,0.6L25.1,110.3z"/>
+	<path d="M49.3,119.5c-0.4,0-0.5-0.3-0.3-0.6l1.4-2.5c0.2-0.3,0.6-0.6,1-0.6l20,0c0.4,0,0.6,0.3,0.6,0.7l-0.2,2.4 c0,0.4-0.4,0.7-0.7,0.7L49.3,119.5z"/>
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