build.go

v1.3.3

package build

import (
	"bytes"
	"encoding/json"
	"fmt"
	"io"
	"io/fs"
	"time"

	"golang.org/x/mod/module"
	"golang.org/x/mod/zip"

	"go.bigb.es/curator/internal/git"
)

// RevInfo is the JSON structure returned by .info and @latest endpoints.
type RevInfo struct {
	Version string    `json:"Version"`
	Time    time.Time `json:"Time"`
	Origin  *Origin   `json:"Origin,omitempty"`
}

// Origin describes the provenance of a module version.
type Origin struct {
	VCS  string `json:"VCS,omitempty"`
	URL  string `json:"URL,omitempty"`
	Hash string `json:"Hash,omitempty"`
	Ref  string `json:"Ref,omitempty"`
}

// Info builds a JSON .info response for the given version.
func Info(repoPath string, rv *git.ResolvedVersion, modulePath string) ([]byte, string, error) {
	hash, t, err := git.CommitInfo(repoPath, rv.GitRev)
	if err != nil {
		return nil, "", err
	}

	info := RevInfo{
		Version: rv.Version,
		Time:    t.UTC(),
		Origin: &Origin{
			VCS:  "git",
			URL:  modulePath,
			Hash: hash,
			Ref:  rv.GitRev,
		},
	}

	data, err := json.Marshal(info)
	return data, "application/json", err
}

// Mod builds a go.mod response. Falls back to a synthetic go.mod if none exists.
func Mod(repoPath string, rv *git.ResolvedVersion, modulePath string) ([]byte, string, error) {
	data, err := git.ReadFile(repoPath, rv.GitRev, "go.mod")
	if err != nil {
		data = []byte("module " + modulePath + "\n")
	}

	return data, "text/plain; charset=utf-8", nil
}

// Zip builds a module zip archive. Works with both bare and non-bare git repos
// by reading files directly via git commands.
func Zip(repoPath string, rv *git.ResolvedVersion, modulePath string) ([]byte, string, error) {
	var buf bytes.Buffer
	mv := module.Version{Path: modulePath, Version: rv.Version}

	files, err := git.ListFiles(repoPath, rv.GitRev)
	if err != nil {
		return nil, "", fmt.Errorf("list files: %w", err)
	}

	var zipFiles []zip.File
	for _, path := range files {
		zipFiles = append(zipFiles, &gitFile{
			repoPath: repoPath,
			rev:      rv.GitRev,
			path:     path,
		})
	}

	if err := zip.Create(&buf, mv, zipFiles); err != nil {
		return nil, "", err
	}

	return buf.Bytes(), "application/zip", nil
}


// gitFile implements zip.File by reading from a bare git repo.
type gitFile struct {
	repoPath string
	rev      string
	path     string
}

func (f *gitFile) Path() string { return f.path }

func (f *gitFile) Lstat() (fs.FileInfo, error) {
	data, err := f.readContent()
	if err != nil {
		return nil, err
	}
	return &gitFileInfo{name: f.path, size: int64(len(data))}, nil
}

func (f *gitFile) Open() (io.ReadCloser, error) {
	data, err := f.readContent()
	if err != nil {
		return nil, err
	}
	return io.NopCloser(bytes.NewReader(data)), nil
}

func (f *gitFile) readContent() ([]byte, error) {
	return git.ReadFile(f.repoPath, f.rev, f.path)
}

// gitFileInfo implements fs.FileInfo for git files.
type gitFileInfo struct {
	name string
	size int64
}

func (fi *gitFileInfo) Name() string      { return fi.name }
func (fi *gitFileInfo) Size() int64       { return fi.size }
func (fi *gitFileInfo) Mode() fs.FileMode { return 0o644 }
func (fi *gitFileInfo) ModTime() time.Time { return time.Time{} }
func (fi *gitFileInfo) IsDir() bool       { return false }
func (fi *gitFileInfo) Sys() any          { return nil }


Source Files

build.go

1	package build
2
3	import (
4	"bytes"
5	"encoding/json"
6	"fmt"
7	"io"
8	"io/fs"
9	"time"
10
11	"golang.org/x/mod/module"
12	"golang.org/x/mod/zip"
13
14	"go.bigb.es/curator/internal/git"
15	)
16
17	// RevInfo is the JSON structure returned by .info and @latest endpoints.
18	type RevInfo struct {
19	Version string `json:"Version"`
20	Time time.Time `json:"Time"`
21	Origin *Origin `json:"Origin,omitempty"`
22	}
23
24	// Origin describes the provenance of a module version.
25	type Origin struct {
26	VCS string `json:"VCS,omitempty"`
27	URL string `json:"URL,omitempty"`
28	Hash string `json:"Hash,omitempty"`
29	Ref string `json:"Ref,omitempty"`
30	}
31
32	// Info builds a JSON .info response for the given version.
33	func Info(repoPath string, rv *git.ResolvedVersion, modulePath string) ([]byte, string, error) {
34	hash, t, err := git.CommitInfo(repoPath, rv.GitRev)
35	if err != nil {
36	return nil, "", err
37	}
38
39	info := RevInfo{
40	Version: rv.Version,
41	Time: t.UTC(),
42	Origin: &Origin{
43	VCS: "git",
44	URL: modulePath,
45	Hash: hash,
46	Ref: rv.GitRev,
47	},
48	}
49
50	data, err := json.Marshal(info)
51	return data, "application/json", err
52	}
53
54	// Mod builds a go.mod response. Falls back to a synthetic go.mod if none exists.
55	func Mod(repoPath string, rv *git.ResolvedVersion, modulePath string) ([]byte, string, error) {
56	data, err := git.ReadFile(repoPath, rv.GitRev, "go.mod")
57	if err != nil {
58	data = []byte("module " + modulePath + "\n")
59	}
60
61	return data, "text/plain; charset=utf-8", nil
62	}
63
64	// Zip builds a module zip archive. Works with both bare and non-bare git repos
65	// by reading files directly via git commands.
66	func Zip(repoPath string, rv *git.ResolvedVersion, modulePath string) ([]byte, string, error) {
67	var buf bytes.Buffer
68	mv := module.Version{Path: modulePath, Version: rv.Version}
69
70	files, err := git.ListFiles(repoPath, rv.GitRev)
71	if err != nil {
72	return nil, "", fmt.Errorf("list files: %w", err)
73	}
74
75	var zipFiles []zip.File
76	for _, path := range files {
77	zipFiles = append(zipFiles, &gitFile{
78	repoPath: repoPath,
79	rev: rv.GitRev,
80	path: path,
81	})
82	}
83
84	if err := zip.Create(&buf, mv, zipFiles); err != nil {
85	return nil, "", err
86	}
87
88	return buf.Bytes(), "application/zip", nil
89	}
90
91
92	// gitFile implements zip.File by reading from a bare git repo.
93	type gitFile struct {
94	repoPath string
95	rev string
96	path string
97	}
98
99	func (f *gitFile) Path() string { return f.path }
100
101	func (f *gitFile) Lstat() (fs.FileInfo, error) {
102	data, err := f.readContent()
103	if err != nil {
104	return nil, err
105	}
106	return &gitFileInfo{name: f.path, size: int64(len(data))}, nil
107	}
108
109	func (f *gitFile) Open() (io.ReadCloser, error) {
110	data, err := f.readContent()
111	if err != nil {
112	return nil, err
113	}
114	return io.NopCloser(bytes.NewReader(data)), nil
115	}
116
117	func (f *gitFile) readContent() ([]byte, error) {
118	return git.ReadFile(f.repoPath, f.rev, f.path)
119	}
120
121	// gitFileInfo implements fs.FileInfo for git files.
122	type gitFileInfo struct {
123	name string
124	size int64
125	}
126
127	func (fi *gitFileInfo) Name() string { return fi.name }
128	func (fi *gitFileInfo) Size() int64 { return fi.size }
129	func (fi *gitFileInfo) Mode() fs.FileMode { return 0o644 }
130	func (fi *gitFileInfo) ModTime() time.Time { return time.Time{} }
131	func (fi *gitFileInfo) IsDir() bool { return false }
132	func (fi *gitFileInfo) Sys() any { return nil }
133