Add Package Registry (#16510)

* Added package store settings.

* Added models.

* Added generic package registry.

* Added tests.

* Added NuGet package registry.

* Moved service index to api file.

* Added NPM package registry.

* Added Maven package registry.

* Added PyPI package registry.

* Summary is deprecated.

* Changed npm name.

* Sanitize project url.

* Allow only scoped packages.

* Added user interface.

* Changed method name.

* Added missing migration file.

* Set page info.

* Added documentation.

* Added documentation links.

* Fixed wrong error message.

* Lint template files.

* Fixed merge errors.

* Fixed unit test storage path.

* Switch to json module.

* Added suggestions.

* Added package webhook.

* Add package api.

* Fixed swagger file.

* Fixed enum and comments.

* Fixed NuGet pagination.

* Print test names.

* Added api tests.

* Fixed access level.

* Fix User unmarshal.

* Added RubyGems package registry.

* Fix lint.

* Implemented io.Writer.

* Added support for sha256/sha512 checksum files.

* Improved maven-metadata.xml support.

* Added support for symbol package uploads.

* Added tests.

* Added overview docs.

* Added npm dependencies and keywords.

* Added no-packages information.

* Display file size.

* Display asset count.

* Fixed filter alignment.

* Added package icons.

* Formatted instructions.

* Allow anonymous package downloads.

* Fixed comments.

* Fixed postgres test.

* Moved file.

* Moved models to models/packages.

* Use correct error response format per client.

* Use simpler search form.

* Fixed IsProd.

* Restructured data model.

* Prevent empty filename.

* Fix swagger.

* Implemented user/org registry.

* Implemented UI.

* Use GetUserByIDCtx.

* Use table for dependencies.

* make svg

* Added support for unscoped npm packages.

* Add support for npm dist tags.

* Added tests for npm tags.

* Unlink packages if repository gets deleted.

* Prevent user/org delete if a packages exist.

* Use package unlink in repository service.

* Added support for composer packages.

* Restructured package docs.

* Added missing tests.

* Fixed generic content page.

* Fixed docs.

* Fixed swagger.

* Added missing type.

* Fixed ambiguous column.

* Organize content store by sha256 hash.

* Added admin package management.

* Added support for sorting.

* Add support for multiple identical versions/files.

* Added missing repository unlink.

* Added file properties.

* make fmt

* lint

* Added Conan package registry.

* Updated docs.

* Unify package names.

* Added swagger enum.

* Use longer TEXT column type.

* Removed version composite key.

* Merged package and container registry.

* Removed index.

* Use dedicated package router.

* Moved files to new location.

* Updated docs.

* Fixed JOIN order.

* Fixed GROUP BY statement.

* Fixed GROUP BY #2.

* Added symbol server support.

* Added more tests.

* Set NOT NULL.

* Added setting to disable package registries.

* Moved auth into service.

* refactor

* Use ctx everywhere.

* Added package cleanup task.

* Changed packages path.

* Added container registry.

* Refactoring

* Updated comparison.

* Fix swagger.

* Fixed table order.

* Use token auth for npm routes.

* Enabled ReverseProxy auth.

* Added packages link for orgs.

* Fixed anonymous org access.

* Enable copy button for setup instructions.

* Merge error

* Added suggestions.

* Fixed merge.

* Handle "generic".

* Added link for TODO.

* Added suggestions.

* Changed temporary buffer filename.

* Added suggestions.

* Apply suggestions from code review

Co-authored-by: Thomas Boerger <thomas@webhippie.de>

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

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
Co-authored-by: Thomas Boerger <thomas@webhippie.de>

modules/packages/hashed_buffer.go

@@ -0,0 +1,70 @@
+// Copyright 2021 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 packages
+
+import (
+	"io"
+
+	"code.gitea.io/gitea/modules/util/filebuffer"
+)
+
+// HashedSizeReader provide methods to read, sum hashes and a Size method
+type HashedSizeReader interface {
+	io.Reader
+	HashSummer
+	Size() int64
+}
+
+// HashedBuffer is buffer which calculates multiple checksums
+type HashedBuffer struct {
+	*filebuffer.FileBackedBuffer
+
+	hash *MultiHasher
+
+	combinedWriter io.Writer
+}
+
+// NewHashedBuffer creates a hashed buffer with a specific maximum memory size
+func NewHashedBuffer(maxMemorySize int) (*HashedBuffer, error) {
+	b, err := filebuffer.New(maxMemorySize)
+	if err != nil {
+		return nil, err
+	}
+
+	hash := NewMultiHasher()
+
+	combinedWriter := io.MultiWriter(b, hash)
+
+	return &HashedBuffer{
+		b,
+		hash,
+		combinedWriter,
+	}, nil
+}
+
+// CreateHashedBufferFromReader creates a hashed buffer and copies the provided reader data into it.
+func CreateHashedBufferFromReader(r io.Reader, maxMemorySize int) (*HashedBuffer, error) {
+	b, err := NewHashedBuffer(maxMemorySize)
+	if err != nil {
+		return nil, err
+	}
+
+	_, err = io.Copy(b, r)
+	if err != nil {
+		return nil, err
+	}
+
+	return b, nil
+}
+
+// Write implements io.Writer
+func (b *HashedBuffer) Write(p []byte) (int, error) {
+	return b.combinedWriter.Write(p)
+}
+
+// Sums gets the MD5, SHA1, SHA256 and SHA512 checksums of the data
+func (b *HashedBuffer) Sums() (hashMD5, hashSHA1, hashSHA256, hashSHA512 []byte) {
+	return b.hash.Sums()
+}